Polyethylene glycol modified interferon alpha 2b and preparation method and applicatioins thereof
Abstract
The present invention relates to interferon-α2b modified with Y-shaped branched polyethylene glycol (PEG) at a single Lys residue and the preparation thereof. The peglated IFN-α2b can be used for the preparation of a medicament for treating a disease, e.g. viral infections such as Hepatitis C.

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10 claims: 4 independent, 6 dependent
- 1CLAIMS REIVINDICAÇÕES 1. A pegylated interferon-a2b (IFN-a2b) of the structure as shown below, obtained by linking IFN-a2b to a Y-branched polyethylene glycol (YPEG):1. Um interferão-a2b (IFN-a2b) peguilado da estrutura como em baixo, obtido ao ligar o IFN-a2b a um polietilenoglicol ramificado em forma de Y (YPEG): Pa --- Xl ^ ÚN— (CHRi) jpB—X2 Pa---Xl^ ÚN— (CHRi)j pb—X2 C— N — IFN-a2b C— N—IFN-a2b Em que, On what, FORThe and Pb is the same or different polyethylene glycol (PEG);j is an integer between 1-12;Pa e Pb é o mesmo ou diferente polietilenoglicol (PEG);j é um número inteiro entre 1-12;R1 is H, substituted or unsubstituted C1-C12 alkyl group, substituted aryl, aralkyl, or heteroalkylene;and Ri é H, grupo alquilo C1-C12 substituído ou não substituído, arilo substituído, aralquil, ou heteroalquileno;e Xi and X2 are independently a linking group, where Xi is (CH2)n, and X2 is selected from the group consisting of (CH2)n, (CH2)n OCO, (CH2)n NHCO, and (CH2)n CO, where n is an integer between 1-10, where YPEG is linked to IFN-a2b through a starch bond formed by the side chain of the ε-amino group of the Lys residue in IFN-a2b corresponding to position 134 in the SEQ ID NO. 1. Xi e X2 são independentemente um grupo de ligação, em que Xi é (CH2)n, e X2 é seleccionado do grupo composto por (CH2)n, (CH2)n OCO, (CH2)n NHCO, e (CH2)n CO, em que n é um número inteiro entre 1-10, em que o YPEG é liqado a IFN-a2b através de uma ligação amido formada pela cadeia lateral do grupo ε-amino do resíduo Lys no IFN-a2b correspondente à posição 134 na SEQ ID N°.l.
- 6A composition that comprises a pharmaceutically effective amount of the 6. Uma composição que compreende uma quantidade farmaceuticamente eficaz do IFN-a2b pegged from either IFN-a2b peguilado de qualquer uma 2/4 das reivindicações 1-5 e um suporte farmaceuticamente aceitável ou excipiente. 2/4 of claims 1-5 and a pharmaceutically acceptable carrier or excipient.
- 9A method for preparing and purifying the pegylated IFN-a2b of any one of claims 1-5, which includes the steps:9. Um método para preparar e purificar o IFN-a2b peguilado de qualquer uma das reivindicações 1-5, que inclui as etapas: (a) sob uma condição alcalina, preferencialmente em pH 9,0, que permite um PEG ramificado em forma de Y da fórmula seguinte para reagir com IFN-a2b, e obtenção de IFN-a2b peguilado;(a) under an alkaline condition, preferably at pH 9.0, which allows a Y-branched PEG of the following formula to react with IFN-a2b, and obtain pegylated IFN-a2b;3/4 3/4 05 05 ROCH2CH2(OCH2CH2)m-0-CH2CH2 μ Η '^.N-(CH2)j— C—Ν—Ο—Ν ROCH2CH2(OCH2CH2)m-0-Ch2CH2 μ Η '^ .N- (CH2)j- C — Ν — Ο — Ν ROC ^ CHjíOC ^ CHjím · ^ —CH3—/' ROC^CHjíOC^CHjím·^—CH3—/' IIλ οο IIλ οο Em que R e R' são independentemente um grupo alquil C1-C4, preferencialmente metilo;Where R and R 'are independently a C1-C4 alkyl group, preferably methyl;j is an integer between 1-12;j é um número inteiro entre 1-12;m e m' indicam o grau de polimerização e podem ser qualquer número inteiro, e m+m' são preferencialmente entre 600 a 1500;mem 'indicate the degree of polymerization and can be any integer, and m + m' are preferably between 600 to 1500;(b) capturando os produtos de reacção obtidos na fase (A) com uma resina de troca aniónica, preferencialmente Q Sepharose FF, e eluição dos produtos num gradiente de aniões, preferencialmente num gradiente de iões cloreto, para obter produtos modificados;(b) capturing the reaction products obtained in step (A) with an anion exchange resin, preferably Q Sepharose FF, and eluting the products in an anion gradient, preferably in a chloride ion gradient, to obtain modified products;(c) eluição dos produtos de reacção capturados na fase (B) com uma resina de troca catiónica, preferencialmente SP Sepharose FF, num gradiente de catiões, preferencialmente num gradiente de iões sódio e depois recolhendo cada pico separadamente;(c) eluting the reaction products captured in step (B) with a cation exchange resin, preferably SP Sepharose FF, in a cation gradient, preferably in a sodium ion gradient and then collecting each peak separately;(d) determinar a actividade do produto de cada pico, e seleccionando o pico correspondente ao produto de reacção com actividade mais elevada. (d) determining the product activity of each peak, and selecting the peak corresponding to the reaction product with the highest activity.
Independent claims4
238 paragraphs in 12 sections, as filed
Description
ALPHA INTERBEAN 2B MODIFIED WITH POLYETHYLENE GLYCOL AND METHOD OF
PREPARATION AND APPLICATIONS OF THE SAME
FIELD OF THE INVENTION
The present invention relates to interferon a-2b modified with y-branched polyethylene glycol (PEG) in a single amino acid residue and the preparation thereof, as well as the use of pegylated IFN-a2b in a single amino acid residue in the pharmaceutical field.
BACKGROUND OF THE INVENTION
Interferons (IFN) are a family of small molecule proteins or glycoproteins produced by eukaryotic cells in response to viral infection and other antigenic stimuli, which demonstrate broad-spectrum, antiviral, antiproliferative and immunomodulatory effects. IFNs have been widely applied in the treatment of various conditions and diseases, such as viral infections, eg, hepatitis B, hepatitis C and HIV; inflammatory disorders and diseases, eg, multiple sclerosis, arthritis, asthma, cystic fibrosis and interstitial lung disease; and tumors, eg, myelomas, lymphoma, liver cancer, lung cancer, tricholeukemia, etc. (Kenji Oritani, Paul W Kincade, et al. Type I interferon and limitin: a comparison of structures, receptors, and functions. Cytokine and Growth Factor Reviews, 12, 337-348, 2001; Yu-Sen Wang, Stephen Youngster, et al. Structural and biological characterization of PEGylated recombinant interferon alpha-2b and its therapeutic implications. Advance Drug Delivery Reviews, 54, 547-570, 2002).
IFNs are classified into four types according to their differences in chemical, immunological and chemical properties.
1/33 biological: interferon-α, β, γ and ε. The interferon-α (IFN-α) is secreted by leukocytes. Human IFN-α are encoded by a family of multigens consisting of approximately 20 genes, the encoded proteins that share up to approximately 90% of the homology of the amino acid sequence (Henco K., Brosius FJ, et al. J. Mol. Biol ., 185, 227-260, 1985). Human IFN-a2b is one of the subtypes of the α 2 subfamily of the human IFN-α family, and is a single chain protein with various biological activities. The single chain protein consists of 165 amino acid residues with 4 Cys, where two intrachain disulfide bridges are formed between Cysl-Cys98 and Cys29-Cysl38, respectively, and the N-terminal amino acid is Cys with a free group a-NH<sub>2</sub>. Residues at positions 31, 49, 70, 83, 112, 121, 131, 133, 134 and 164 of the amino acid sequence are Lys, all of which contain an ε-ΝΗ free group<sub>2</sub>. This protein is not glycosylated and sensitive to many proteases. The amino acid sequence of interferon-a-2b is shown in SEQ ID NO: 1.
IFNs are usually administered parenterally in clinical treatments. The short in vivo half-life (2-4h) and the strong immunogenicity of IFNs result in a shorter dosing interval and a higher dosing frequency. As the antibodies generated significantly decrease therapeutic efficacy, it is difficult to obtain optimal clinical efficacy. The polyethylene glycol (PEG) modification technology developed in recent years has provided a possible solution to the problems mentioned above.
PEG is an organic polymer, inert, non-toxic and biodegradable, and is important in the fields of biotechnology and pharmaceuticals. The PEG modification technique is to bind PEG to an active protein through covalent bonding. After glycosylation of polyethylene (pegylation), the properties of the protein can be significantly improved, for example, the prolongation of the metabolic half-life of the drug, the reduction of
2/33 immunogenicity, increased safety, improved therapeutic efficacy, decreased dosing frequency, increased drug solubility / water solubility, increased resistance to proteolysis, facilitated controlled drug administration, etc. For additional details, see Inada et al. J. Bioact. And Compatible Polymers, 5, 343, 1990, Delgado et al. Critical Reviews in Therapeutic Drug Carrier Systems, 9, 249, 1992, Katre. Advanced Drug Delivery Systems, 10, 91, 1993, and U.S. Patent Publication No. 417933.
It is described in U.S. Patent No. 4179337, that after binding PEG to an enzyme or insulin, the immunogenicity of the protein was reduced, while simultaneously the activities of the protein were also reduced. This was also discovered in GCSF (Satake-Ishikawa et al. Cell Structure and Function, 17, 157-160, 1992), IL-2 (Katre et al. Proc. Natl. Acad. Sci. USA, 84, 1487, 1987 ), TNF-α (Tsutsumi et al. Jpn. J. Cancer Res., 85, 9, 1994), IL-6 (Inoue et al. J. Lab. Clin. Med., 124, 529, 1994) and CD4-IgG (Chamow et al. Bioconj. Chem., 5, 133, 1994).
The PEG modified branched protein has been reported to exhibit better pH tolerance, thermostability and resistance against proteolysis than linear chain PEG modified proteins (Monfardini et al. Bioconjugate Chem., 6, 62, 1995).
Generally, a PEG molecule modifies a protein by binding to the N-terminal α-amino group or ε-amino groups of a Lys residue within the protein molecule. There are normally three types of PEG for protein modification: a straight chain PEG (EP 0593868), a U-shaped branched PEG (EP 0809996) and a Y-shaped branched PEG (CN1243779C).
Currently, many types of pegylated proteins have been applied clinically. In 1990, pegylated bovine adenosine deaminase (Adagen) produced by ΕΝΖΟΝ Inc. was approved by the
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FDA, and used to treat severe combined immunodeficiency disease (pegfamgO13102LB, http://www.fda.gov). In 1994, another modified PEG protein to treat acute lymphoblastic leukemia, pegylated asparaginase (pegaspargase, Oncaspar), was also marketed in the United States (103411s50521bl, http://www.fda.gov). 0 PEG-modified interferon-a2b (PEG
IFN-a2b, PEG-intron) developed by Schering-Plow was approved by the FDA for commercialization in 2000 and pegylated interferon-a2b (PEG IFN-a2a, PEGASIS) produced by Hoffman-La Roche Ltd. was also approved for commercialization in 2002 , both used to treat hepatitis (103964s50371bl, pegsche011901LB, http://www.fda.gov). In 2002, the PEG-modified human granulocyte colony stimulating factor produced by Amgen Inc. (PEG-filgrastim, Neulasta) has also been approved by the FDA, which is used to treat metastatic breast cancer (pegfamg013102LB, http: //www.fda,gov). The FDA also accepted the application for the pegylated human growth factor antagonist developed by Pharmacia. The TNF-α antibody fragment combined with Celltech's PEG and Amgen's PEG-TNF receptor are tested in advanced clinical trials. The first conjugate of the organic molecule PEG, pegylated camptothecin, also entered the phase II clinical trial. In 2004, the PEG-modified oligonucleotide (Pegaptanib, Macugen ™) was approved by the FDA. The in vivo metabolism of PEG in the drug (or the PEG itself) has been clearly understood, and the proven that PEG is a good and safe drug modifier, without any side effects.
PEGs can be linked to a proteinaceous drug normally in need of derivatization, so that one or two end groups of the PEG ends can be chemically activated to have an appropriate functional group that shows activity, and thus can form a stable covalent bond with, at least one functional group of the drug to be linked. For example, PEG can be linked to s-NH<sub>2</sub> of the Lys residue
4/33 within the protein peptide chain, or for a-NH<sub>2</sub> of the N-terminal amino acid residue of the peptide chain of the protein. In IFN-α pegylation described in European patent EP0809996, PEG-NHS is linked via nucleophilic substitution for a-NH<sub>2 </sub>of the N-terminal amino acid or ε-ΝΗ<sub>2</sub> of Lys in IFN-α. The PEG-NHS mentioned in the above patent is a derivative of branched U-shaped PEG (PEG<sub>2</sub>-NHS), the molecular formula of the same as below:
ROCH ^ DHaOCHzCHan — 0-C — NH
RWHjCHjIOCHgCH ^ - O ~ C II 0
<img file="PT2186830E_D0001.tif" />
Where R and R 'are independently a low molecular weight alkyl group, nen' are between 600 to 1500, and the average molecular weight of PEG is 26KD to 66KD. The molecular formula of PEG-modified IFN-a<sub>2</sub>-NHS is as follows:
The
ROCH.CHtfOCHjCH A — Q -C -NH
Ιηλ
L ZILClUOaLCHA, —Λ — r — mÍ X— BNa
Where one or more PEG molecules<sub>2</sub>-NHS are linked to a-NH2 of the N-terminal amino acid or s-NH2 of Lys in IFN-α, the products obtained are a mixture of non-pegylated IFN-α, pegylated IFN-α with a single amino acid residue and IFN-α pegylated into multiple amino acid residues. IFN-α pegylated with a single amino acid residue can be isolated from the products obtained by any appropriate 5/33 purification media. IFN-α has an Nterminal amino acid and more than one Lys residue, namely different reactive sites for PEG<sub>2</sub>-NHS, so the pegylated IFN-α isolated with a single amino acid residue is a mixture of pegylated IFN-α isomers in different single amino acid residues.
In European patent EP 0593868, the straight chain PEG is used to modify the IFN, the molecular formula of the modified product is as follows:
θ 1
X
RO- (CH<sub>2</sub>CHO)<sub>x</sub>- (CH<sub>2</sub>CHO)<sub>y</sub>- (CH<sub>?</sub>CHO)<sub>z</sub>-Ch<sub>2</sub>CH-W- '' NH- - interferon-a
a 'R<sup>3</sup> k
Where R is a low molecular weight alkyl group; To laugh<sub>2</sub>, R<sub>3</sub> and R<sub>4</sub> are H or low molecular weight alkyl groups; m is 1 to the number of possible PEG modification positions in the IFN; W is O or NH; X is 1 to 1000, Y and z are 0 to 1000, x + y + z are 3 to 1000 and at least one of Ri, R<sub>2</sub>, R<sub>3</sub> and R<sub>4</sub> is a low molecular weight alkyl group. Yu-Sen Wang et al (Yu-Sen Wang et al, Advanced Drug Delivery Reviews, 54: 547-570, 2002. Yu-Sen Wang et al, Biochemistry, 39, 10634-10640, 2000) have reported rIFN modification -a2b with 12KD linear PEG-monomethoxy (Peg-Intron) and showed that the products analyzed by HPLC-IE are a mixture of more than 14 PEG-modified isomers in different single amino acid residues. The molecular formula of the linear PEGs used by Yu-Sen Wanq et al is shown below:
° /
H<sub>3</sub>C- (0CH<sub>2</sub>CH<sub>2</sub>)<sub>n</sub>-0-C-0-N
II
Where the average molecular weight of PEG is 12KD.
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SUMMARY OF THE INVENTION
The PEG derivatives used in the present invention are derived from Y-branched, newly branched PEG, and their structures are different from those of U-branched PEG. The big difference between these two types of PEG is that: the PEG chains with two branches of the Y-shaped PEG derivatives, according to the present invention, are joined through the N atom, while the PEG chains with two branches of the U-shaped PEG derivatives in EP0809996 are joined via the C atom. The molecular composition of the Y-shaped PEG derivatives, according to the present invention, is shown as follows:
PaX
Çn --- (CHRjjjF
PbX
Where P<sub>The</sub> and Pb are the same or different PEG; j is an integer from 1 to 12; R1 is H, a substituted or unsubstituted C1-C12 alkyl group, a substituted aryl, an aralkyl or a heteroalkylene; Xi and X<sub>2</sub> are independently a linking group, where X<sub>2</sub> is (CH<sub>2</sub>)<sub>n</sub>, and X<sub>2</sub> is selected from the group consisting of (CH<sub>2</sub>)<sub>n</sub>, (CH<sub>2</sub>)<sub>n</sub> OCO, (CH<sub>2</sub>)<sub>n</sub> NHCO, and (CH<sub>2</sub>)<sub>n</sub> CO; n is an integer from 1 to 10; and F is a terminal group selected from the group consisting of a hydroxyl group, a carboxyl group, an ester group, acyl chloride, hydrazide, maleimide, pyridine disulfide, capable of reaction with an amino, hydroxyl or mercapto group. a therapeutic agent or a substrate to form a covalent bond.
In a preferred embodiment of the present invention, the Y-shaped PEG-derived molecule is shown as follows: 7/33
ROCH<sub>2</sub>CH<sub>2</sub>(OCH<sub>2</sub>CH<sub>2</sub> )<sub>m</sub>-<sub>0</sub>-Ch<sub>2</sub>CH<sub>2</sub>
ROCH<sub>2</sub>CH<sub>2</sub>(OCH<sub>2</sub>CH<sub>2</sub> ) ^ - 0 CH. — C 'II
THE
Where R and R 'are independently a C1-C4 alkyl group, preferably methyl; m and m 'indicate the degree of polymerization and can be any integer; m + m 'are preferably between 600 to 1500; R1 is H, a substituted or unsubstituted C1-C12 alkyl, a substituted aryl, an aralkyl, or a group of heteroalkylene; j is an integer from 1 to 12; and F is a terminal group selected from the group consisting of a hydroxyl group, a carboxyl group, an ester group, carboxylic acid chloride, hydrazide, maleimide, pyridine disulfide, capable of reaction with an amino group, a group of hydroxyl or a mercapto group of a therapeutic agent or a substrate to form a covalent bond. Preferably, the average total molecular weight of the PEG is approximately 10,000 to approximately 60000 Dalton, more preferably approximately 40,000 Dalton.
In a preferred embodiment of the present invention, a possible structural formula for the Y-shaped PEG-derived molecule is shown as formula (I):
The
ROCH<sub>2</sub>CH<sub>2</sub>(OCH<sub>2</sub>CH<sub>2</sub>)<sub>m</sub>-o-CH<sub>2</sub>CH ^ μ H
C— N — O— K] (D
ROCHoCH ^ OC ^ CHj)<sub>m</sub>'-<sub>0</sub> CH, —Z
THE ()
Where R and R 'are independently a C1-C4 alkyl group, preferably methyl; m and m 'indicate the degree of polymerization and can be any integer; m + m 'are preferably
8/33 between 600 to 1500; j is an integer from 1 to 12 and the total average molecular weight of the PEG is approximately 40000 Dalton.
The present inventors used Y-branched PEG derivatives (YPEG) to modify interferon-a-2b (IFN-a2b), and isolated PEG-modified YPEG-IFN-a2b with a single amino acid residue by exchange chromatography of ions in Q-Sepharose FF. In addition, the isolated YPEG-IFN-a2b, modified by PEG with a single amino acid residue, was further separated by SP-Sepharose FF chromatography to obtain YPEG-IFN-a2b, characterized in that YPEG is mainly linked to the ε- side chain ΝΗ<sub>2</sub> of Lys at position 134, in SEQ ID No. 1, which is called YPEG-IFN-a2b (134). After measurement, it was found that the in vitro activity of YPEG-IFN-a2b (134) is significantly higher than that of YPEG-IFN-a2b, in which YPEG is linked to another amino acid residue, and the half-life of YPEGIFN-a2b (I34) in serum is significantly greater than that of unmodified IFN-a2b.
Accordingly, the present invention provides pegylated IFN-a2b with a single amino acid residue, the structure of which is as follows:
Pa --- X | ^
Pb— * 2 'li <sup>H</sup>
C— N —IFN-a2b
Where P<sub>The</sub> and Pb are the same or different PEGs; j is an integer from 1 to 12; R1 is H, a substituted or unsubstituted C1-C12 alkyl group, a substituted aryl, an aralkyl, or a heteroalkylene group; Xi and X<sub>2</sub> are independently a linking group, where Xi is (CH<sub>2</sub>)<sub>n</sub>, and X<sub>2</sub> selected from the group consisting of (CH<sub>2</sub>)<sub>n</sub>, (CH<sub>2</sub>)<sub>n</sub> OCO, (CH<sub>2</sub>)<sub>n</sub> NHCO e (CH<sub>2</sub>)<sub>n</sub> CO, characterized in that n is an integer from 1 to 10.
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In a preferred embodiment of the present invention, the branched IFNa2b of the present invention is of the formula (II) below:
ROCH<sub>2</sub>CH<sub>2</sub>(OCH<sub>2</sub>CH<sub>2</sub>)<sub>m</sub>-o-CH, CH<sub>2</sub>, f [ <sub>H</sub> - C —N — EFN-a2b
ROCH? CH<sub>2</sub>(OCH<sub>2</sub>CH<sub>2</sub> )<sub>m</sub>'-0 CH. — C' II o (Π)
Where R and R 'are independently a C1-C4 alkyl group, preferably methyl; j is an integer from 1 to 12; mem 'indicate the degree of polymerization and can be equal or different integers. In this structure, a Y-branched PEG molecule is linked to an IFN-a2b molecule through a single amino acid residue. The average molecular weight of YPEGIFN-a2b in formula (II) depends mainly on the polymerization rate, mem *. Where m + m 'are preferably 600 to 1500, the corresponding average molecular weight of YPEG is approximately 26000 to approximately 66000 Dalton. Where m + m 'are preferably 795 to 1030, the corresponding average molecular weight of YPEG is approximately 35000 to approximately 45000 Dalton. Where m + m 'are preferably 885 to 1030, the corresponding average molecular weight of YPEG is approximately 39000 to approximately 45000 Dalton. Where m + m 'is more preferably 910, the corresponding average molecular weight of YPEG is 40000 Dalton. The ratio of mem 'can vary from 0.5 to 1.5, preferably from 0.8 to 1.2.
In a preferred embodiment, in the branched IFN-a2b of the present invention, a PEG molecule is linked to IFN-a2b via a starch linkage formed by an α-amino group of the N-terminal amino acid or the side chain of the ε-amino group. waste group
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IFN-a2b Lys corresponding to position 31, 49, 70, 83, 112,
121, 131, 133, 134 or 164, as shown in SEQ ID No. 1.
In an additional preferred embodiment, in the pegylated IFN-a2b of the present invention, a PEG molecule is linked to IFNa2b via an amido bond, mainly formed by the side chain of the ε-amino group of the Lys residue of IFN-a2b corresponding to position 134 , as shown in SEQ ID NO. 1.
Optionally, the IFN-a2b of the present invention can be extracted from natural sources or obtained by recombinant biotechnology. Preferably, IFN-a2b is a human IFN-a2b (hIFN-a2b) with the amino acid sequence of SEQ ID No. 1, which is extracted from natural sources or obtained by recombinant biotechnology. More preferably, human IFN-a2b is recombinant human IFN-a2b (rhIFN-cx2b). RhIFN-a2b can be artificially synthesized, or be expressed from prokaryotic expression systems such as E. coli, or be expressed from yeast-based eukaryotic expression systems, such as Pichia, or be expressed from cell expression systems. insect or mammalian cell expression systems, such as CHO. Methods of preparing natural or recombinant IFN-a2b, and YPEG-modified IFN-a2b and IFN-a2b activity tests are known in the prior art.
Similar to IFN-a2b, the YPEG-IFN-a2b of the present invention can also be used clinically to treat tumors and viral infections, such as hepatitis, tricholeukemia, cell-mediated lympholysis, Kaposi's sarcoma, etc. Under clinical conditions, the YPEGIFN-a2b of the present invention is clearly improved, compared to IFN-a2b, in stability, solubility, serum half-life and efficacy of clinical therapy. For the mode of administration, the YPEG-IFN-a2b of the present invention can be administered to patients in the form of a composition comprising a pharmaceutically effective amount of YPEG-IFN
11/33 a2b and a pharmaceutically acceptable carrier or excipient. Thus, the present invention, in another aspect, also provides a composition comprising a pharmaceutically effective amount of the pegylated IFN-a2b of the present invention and a pharmaceutically acceptable carrier or excipient. Preferably, the composition comprises mannitol, amino acids, sodium chloride and sodium acetate, characterized in that the amino acids are preferably selected from the group consisting of aspartic acid, asparagine and glycine.
In another aspect, the present invention also provides for the use of the pegylated IFNa2b of the invention or the composition comprising the pegylated IFNa2b of the invention in the preparation of a medicament for treating a disease in need of treatment with IFN-a2b. Preferably, the disease in need of treatment with IFN-a2b is selected from the group consisting of viral infections, eg, hepatitis B, hepatitis C, hepatitis D and acuminated condyloma, tumors, eg, tricholeukemia, chronic myeloid leukemia, leukemia non-Hodgkin's with low degree of malignancy, cell-mediated lympholysis, Kaposi's sarcoma, multiple myeloma, malignant melanoma, cutaneous T-cell lymphomas, laryngeal papilloma, recurrent or metastatic renal cell carcinoma, inflammatory diseases and illnesses, eg, multiple sclerosis, arthritis, asthma, cystic fibrosis and interstitial lung disease, and thrombocythemia related to myeloproliferative diseases.
To obtain YPEG-modified IFN-a2b, in an embodiment of the present invention, initially the PEG parts of activated YPEG derivatives, such as PEG ester Nhydroxysuccinimide (YPEG-NHS) is covalently linked to an amino group (- NH<sub>2</sub>) of the protein through nucleophilic substitution, characterized in that the amino group includes an α-amino group N-terminal of the protein and an ε-amino group of the residue
12/33
Lys. The reaction equation for the generation of YPEG-IFN-a2b from IFNa2b and YPEG is as follows:
<img file="PT2186830E_D0002.tif" />
ROCH<sub>2</sub>CH<sub>2</sub>(OCH<sub>2</sub>CH<sub>2</sub> )<sub>m</sub>-0-CH<sub>2</sub>CH<sub>2</sub> roch<sub>2</sub> CH<sub>2</sub> (OCH<sub>2</sub> CH<sub>2</sub> )<sub>m</sub>· -O - oh + H<sub>2</sub>N-IFNa2b
ROCH<sub>2</sub>CH<sub>2</sub>(OCH<sub>2</sub>CH<sub>2</sub> ) mO-CH, CH, li H '“' • N- (CH<sub>2</sub>) .- CN-IFNa2b
R'OCH<sub>2</sub> CH<sub>2</sub> (OCH<sub>2</sub> CH<sub>2</sub>) <sub>m</sub>· -O _ CH-yC<sup>7</sup>
The reaction conditions are mild, the pH ranges from 4.5 to 9.5, the temperature is between 0 to 25 ° C, and mixing or stirring measures are required. For detailed conditions, the Examples can be consulted in the DETAILED DESCRIPTION OF THE INVENTION. All YPEGs with different molecular weights can be linked to IFN-a2b using the method mentioned above. Products include PEG modified with a single amino acid residue (YPEG-IFNa2b), PEG modified with two amino acid residues (YPEG2 IFN-a2b) and PEG modified with multiple amino acid residues (YPEG<sub>n</sub>-IFN-a2b), characterized in that PEG-modified products with a single amino acid residue can be predominant products to adjust the reaction condition.
Subsequently, YPEG-IFN-a2b, modified by PEG with a single amino acid residue, can be isolated from the mixture of all types of YPEG-modified IFN-a2b using a method, such as cation exchange chromatography, anion exchange chromatography, or exclusion chromatography, and then PEG-modified IFN-a2b at different single amino acid residues can be further resolved to obtain YPEG-IFN-a2b in which YPEG is linked to a specific position. Conventional 13/33 purification methods include cation exchange chromatography, anion exchange chromatography, hydrophobic interaction chromatography and exclusion chromatography. The characteristic analysis can be carried out by a method known in the art, eg mass spectroscopy, polypolycrylamide gel electrophoresis and high-performance liquid exclusion chromatography can be used to analyze the molecular weight of the products, to distinguish products modified by PEG with a single amino acid residue from those modified by PEG with two or multiple amino acid residues and unmodified IFN-a2b. The aforementioned purification methods can also be used to further resolve PEG-modified products with a single amino acid residue to obtain different isomers with the PEG-modification at different unique positions. The in vitro biological activities of all types of PEG-modified products can be measured according to any known assay for IFN activity, eg, inhibition of cytopathic effect. For PEG-modified IFNs with a single amino acid residue, the PEG fractions in the different isomers have different effects on maintaining the active IFN domains, resulting in large differences in the biological activities of the different isomers. Generally, in vitro IFN activities are noticeably decreased after PEG modification. However, according to the present invention, the specific in vitro activity of the three-peak isolates obtained by ion exchange chromatography has been measured, and the results indicate that the peak 3 (SP2) isolate has significantly higher specific activity than isolates from other peaks and PEGASYS (Hoffmann-La Roche, Basel, Switzerland), and have a significantly longer half-life in serum than unmodified IFN-a2b.
In a further embodiment, the Y-branched PEG-bound peptide, isolated from SP2, is sequenced using the
14/33 Edman degradation, and the results showed that the primary component of SP2 was YPEG-IFN-a2b (134).
Thus, in another aspect, the present invention also provides the preparation and purification methods for YPEG-IFN-a2b (134), which comprises:
(a) under an alkaline condition, preferably at pH 9.0, which allows the Y-branched PEG, as shown in formula (I) below, to react with IFN-a2b, and obtain pegylated IFN-a2b;
here
ROCHjCHjíOCHjCH ^ mo-CHjCH. ^ Ff H ^ '. N- (CH<sub>2</sub>) j —C - N— O - »/ Ι
ROCH2 CH<sub>2</sub>(OCH<sub>2</sub> CH<sub>2</sub> )<sub>m</sub>· -O - CH. — J 'H ff
The t) (I)
Where R and R 'are independently a C1-C4 alkyl group, preferably methyl; j is an integer from 1 to 12; mem 'indicate the degree of polymerization and can be any integer; and m + m 'are preferably between 600 to 1500;
(b) capturing the reaction products in step (A) with an anion exchange resin, preferably Q Sepharose FF, and eluting the products in an anion gradient, preferably in a chloride ion gradient, to obtain modified products;
(c) elution of the reaction products captured in step (B) with a cation exchange resin, preferably SP Sepharose FF, in a cation gradient, preferably in a sodium ion gradient, and collecting each peak separately:
15/33 (d) determining the product activity of each peak, and selecting the peak corresponding to the reaction product with the highest activity.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG.l: SDS-PAGE (Polyacrylamide gel electrophoresis with sodium dodecyl sulfate) from 2 lots of YPEG-modified IFN-a2b (40KD). The concentration of the separation gel was 12%, and bright Coomassie blue R-250 was used as the color. It can be seen from the result of the SDS-PAGE (polyacrylamide gel electrophoresis with sodium dodecyl sulfate) of FIG.l, under the condition, the PEG modification level of rHuIFN-a2b was between 30 to 50, and was stable. The modified primary products were PEG-modified IFNa2b with a single amino acid residue (YPEGIFN-a2b), and there were also some PEG-modified IFN-a2b at multiple amino acid residues (YPEGn-IFN-a2b). Lane 1: IFNa2b, NHS-YPEG (40KD) modification reaction at Oh; lane 2: lot 060604-1 of IFN-a2b, NHS-YPEG (40KD) modification reaction at 2h; lane 3: lot 060604-2 of IFN-a2b, NHS-YPEG (40KD) modification reaction at 2h; lane 4: marker (GE Lifescience).
FIG.2: the resolution profile of the YPEGIFN-a2b modification isomers by SP-Sepharose FF.
FIG.3: SDS-PAGE (Polyacrylamide gel electrophoresis with sodium dodecyl sulfate) with silver staining (12%) of the YPEG-IFN-a2b samples purified by SP-Sepharose FF. lane 1: molecular weight marker (GE Lifescience); lane 2: YPEG-IFN-a2b purification peak SP-Sepharose FF 1; lane 3: YPEG-IFN-a2b SP-Sepharose FF 2 purification peak, lane 4: YPEG-IFN-a2b SP-Sepharose FF 3 purification peak; lane 5: YPEG-IFN-a2b SP-Sepharose FF 4 purification peak.
FIG.4: apparent molecular weight of the sample of YPEG-rHuIFN-a2b purified by SP-Sepharose FF determined by 7.5% reduction
16/33 SDS-PAGE (Electrophoresis in polyacrylamide gel with sodium dodecyl sulfate) with silver coloring. Lane 1: molecular weight marker (GE Lifesciences); lane 2: YPEG-HuIFN-a2b SP1, 2 pg; lane 3: YPEG-rHuIFN-a2b SP2, 2 pg; lane 4: YPEG-rHuIFN-a2b SP3, 2 pg.
FIG.5: the molecular weights of YPEG-IFN-a2b samples, purified with SP-Sepharose FF, determined by MALDI-TOF MS.
FIG.6: the molecular weight of YPEG-NHS (40KD) was determined by MALDI-TOF MS.
FIG.7: the concentration of the drug in the serum and the activity after a single subcutaneous injection of 30 pg.kg ”<sup>1</sup> of YPEG-rhIFN-a2b in Ma caco cinomolgos (Macaca fascicularis).
FIG.8: the trypsin-digested YPEG-rHuIFN-a2b SP2 Peptide Mapping blank assay. Two small peaks were detected respectively in 71,674 min. and 17,589 min .; and the trypsin peak was detected between 2-3 minutes.
FIG.9: Analysis of the Trypsinase Peptide Mapping of the trypsin-digested (Oh) YPEG-IFN-a2b SP2 sample by HPLC-RP Cig. The retention time of YPEG-IFN-a2b SP2 was 62,114 min .; and the peak elution at 71,908 min. were the previous ones, 2-3 min.
FIG.10: Analysis of the Trypsinase Peptide Mapping of the sample of YPEG-IFN-a2b SP2 digested by trypsin (48h) by HPLC-RP Cis. No substrate peak was detected (62,114 min.) Between 60.5min.- 63.2min., Which demonstrates that the sample has been completely digested.
FIG.11: the Sephacryl S-100 HR separation profile of the YPEG-modified peptides from the YPEG-IFN-a2b SP2 sample completely digested by trypsin.
The samples were
17/33 collected according to the peaks, S100-1 were peptides modified by YPEG, namely the target sample.
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be further described by the following examples, but any example or combination thereof should not be understood as limiting the scope or embodiment of the invention. The scope of the invention is limited only by the appended claims. In combination with the description and prior art, persons skilled in the art would clearly understand the scope limited by the claims.
Example 1
Preparation of Y-shaped branched PEG-modified recombinant human IFN-a2b (1) Small-scale preparation of Y-shaped branched PEG-modified recombinant human IFN-a2b
166.1 mg of YPEG (formula (I), average molecular weight 40KD, equal arm, batch number RD010P041, Beijing JenKem Technology Co., Ltd.) were weighed and dissolved in 1 ml of 2 mM HCl (Guangdong Guanghua Chemical Factory Co., Ltd.). and 40 mg IFNa2b (Xiamen Amoytop Biotech Co., Ltd.) and 50 mM borax / boric acid buffer solution (pH 9.0, Sinopharm Shanghai Chemical Reagent Co., Ltd.) were added to a final reaction volume 10 ml. In this reaction system, the final concentration of IFN-a2b was 4 mg / ml, and the molar reaction ratio of IFN-a2b and YPEG was 1: 2. The reaction system was maintained at 0-20 ° C for 2h with stirring. Pegylated IFN-a2b was then generated, and the reaction was stopped by adding glacial acetic acid (Shantou Xilong Chemical Co., Ltd.) to result in a pH <4.0. One
18/33 sample was submitted to SDS-PAGE. The reaction system was diluted 50 times with water and then 0.2 pm filtered before being stored at 4 ° C for further use.
Q-Sepharose FF chromatography was used to separate the remaining PEG and PEG hydrolates, YPEG-modified IFN-a2b into multiple amino acid residues, YPEG-modified IFN-a2b with a single amino acid residue and unmodified IFN-a2b. The Q-Sepharose FF column (GE Healthcare) (φ2 mm x 90 mm; lVC = 10ml) was regenerated with 3CV of 20 mM borax / boric acid buffer solution (pH 9, O) -1 M NaCl (BBI), and then equilibrated with 5CV of 20 mM borax / boric acid buffer solution (pH 9.0). The UV detection wavelength was set at 280 nm. The entire sample stored at 4 ° C was loaded. After loading, the column was equilibrated with 3CV of borax / boric acid buffer solution (pH 9.0), and then 20 mM of borax / boric acid buffer solution (pH 9.0) -12 mM NaCl was used to elution until the first peak has been completely eluted, the peak of which was the remaining 20 mM PEG of borax / boric acid buffer (pH 9.0) -60 mM NaCl was then used for elution, and the sample collected at this elution peak was mainly YPEG-IFNa2b, modified by PEG with a single amino acid residue. And then, 20 mM borax / boric acid buffer solution (pH 9.0) 500 mM NaCl was used for elution and the peak elution was unmodified IFN-a2b.
The target products were mainly PEG-modified YPEG-IFN-a2b with a single amino acid residue, with a production level of 20 to 40%.
2) Large-scale preparation of Y-branched PEG-modified recombinant human IFN-a2b
4982.4 mg of YPEG (formula (I), average molecular weight 40KD, equal arm, batch number RD010P041, Beijing JenKem Technology Co.,
19/33
Ltd.) were weighed and dissolved in 25 ml of 2 mM HCl and 1200 mg IFN-a2b and 50 mM borax / boric acid buffer solution (pH 9.0) were added to a final reaction volume of 200 ml . In this reaction system, the final concentration of IFN-a2b was 6 mg / ml, and the molar reaction ratio of IFN-a2b and YPEG was 1: 2. The reaction system was kept below 0-25 ° C for 2 h with stirring. The reaction was stopped by adding glacial acetic acid to result in a pH <4.0. One sample was submitted to SDS-PAGE. The reaction system was diluted 50 times with water and then 0.2 pm filtered before being stored at 4 ° C for further use.
Q-Sepharose FF chromatography was used to separate the remaining PEG and PEG hydrolates, YPEG-modified IFN-a2b into multiple amino acid residues, YPEG-modified IFN-a2b with a single amino acid residue and unmodified IFN-a2b. The Q-Sepharose FF column (GE Healthcare) (φ38 mm x 265 mm; 1CV = 3OO ml) was regenerated with 3CV of 20 mM borax / boric acid buffer solution (pH 9, O) -1M NaCl and then equilibrated with 5CV of 20 mM borax / boric acid buffer solution (pH 9.0). The UV detection wavelength was set at 280 nm. The entire sample stored at 4 ° C was loaded. After loading, the column was equilibrated with 3CV of borax / boric acid buffer solution (pH 9.0), and then 20 mM of borax / boric acid buffer solution (pH 9.0) -12 mM NaCl was used to elution until the first peak has been completely eluted, the peak of which was the remaining 20 mM PEG of borax / boric acid buffer (pH 9.0) -60 mM NaCl was then used for elution, and the sample collected at this elution peak was mainly YPEG-IFN-a2b, modified by PEG with a single amino acid residue. And then, 20 mM borax / boric acid buffer solution (pH 9.0) -500 mM NaCl was used for elution and the peak elution was unmodified IFN-a2b.
20/33
The target products were mainly PEG-modified YPEG-IFN-a2b with a single amino acid residue, with a production level of 35 to 50%.
FIG.l shows the results of the SDS-PAGE for 2 YPEG-modified IFN-a2b lots (40KD). It can be seen in figure 1 that under the condition, the PEG modification level of rhIFN-a2b was between 35 to 50% and remained stable. The modified primary products were modified by PEG with a single amino acid residue (YPEG-IFN-a2b), and there were also some products modified by PEG in multiple amino acid residues (YPEG<sub>n</sub>-IFNa2b).
Example 2
Solving YPEG-IFN-a2b through SP-Sepharose FF
The YPEG-IFN-a2b sample captured by Q-Sepharose FF was adjusted to pH 5.0 with 20% acetic acid, then diluted 15 times with 5 mM NaAc / HAc (pH 5.0, Shantou Xilong Chemical Co., Ltd .). The sample was loaded in 0.5 mg / ml capacity onto a column (φ18 mm x 394 mm) with 100 ml of SP-Sepharose FF (GE Healthcare). The column was equilibrated with 3CV of 5 mM NaAc / HAc (pH 5.0), and then eluted with 2.5CV of the gradient of 0% -30% of 5 mM NaAc / HAc70 mM NaCl (pH 5.0), then with 50CV of the 30% -100% gradient of 5 mM NaAc / HAc-70 mM NaCl (pH 5.0). YPEG-IFN-a2b was resolved as 4 elution peaks per 100 ml of SP-Sepharose FF. The samples were collected according to these peaks and then measured by silver-colored SDS-PAGE, respectively. According to the results of the SDS-PAGE it can be seen that peak 1 resolved by SP-Sepharose FF was mainly products modified by YPEG in multiple amino acid residues (YPEG<sub>n</sub>-IFN-a2b). Peak 2 by SP-Sepharose FF was mainly products modified by PEG with a single amino acid residue (YPEG-IFN-a2b), and also contained some modified products
21/33 by PEG in multiple amino acid residues. Peak 3 and peak 4 by SP-Sepharose FF were both PEG-modified products with a single amino acid residue. Peaks 2-4 resolved by SP-Sepharose FF were YPEG-modified isomers at different unique positions, and were named respectively YPEG-IFNa2b SP1; YPEG-IFN-a2b SP2 and YPEG-IFN-a2b SP3. The resolution profile and the silver-colored SDS-PAGE results were shown in Fig. 2 and FIG.3, respectively.
All samples of YPEG-IFN-a2b SP1-3 were supplemented with sodium chloride, sodium acetate, mannitol, aspartic acid and sterilized with a 0.22 pm filter before being stored at 4 ° C for additional use.
Example 3
Characteristic analysis of YPEG-IFN-a2b modification isomers (1) Protein concentration
The concentrations of YPEG-IFN-a2b modification isomers were determined by the Kjeldahl method.
(2) Apparent molecular weight of the protein
The apparent molecular weights of YPEGIFN-a2b modifying isomers were determined by SDS-PAGE. The method was according to Laemmli et al (Nature 227: 680, 1970). The concentration of the gel was 7.5%, and the gel was visualized by silver staining. The apparent molecular weights of YPEG-IFN-a2b modifying isomers were almost the same, approximately 123KD (FIG.4).
(3) Molecular weight determined by MALDI-TOF MS
22/33
MALDI-TOF MS (Autoflex TOF / TOF System, Bruker Daltonics, Germany) was used to determine the molecular weights of the YPEG-IFN-a2b modification isomers. Synapinic acid (SA, CnH2 Os, MW 224.22, lot number: 2006 236870 002, Bruker Daltonics, Germany) was used as a matrix. The protein calibration standard II (reference n ° 207234, Bruker Daltonics, Germany) was used as a protein molecular weight standard, and the data analysis software was FlexAnalysis Ver.3.0.54.0. The MS molecular weights of the YPEG-IFN-a2b modification isomers were almost the same, approximately 59000 Dalton (FIG.5).
(4) Endotoxin content test
Based on the limulus trial (Pharmacopoeia of the People's Republic of China, 2005, Volume 3, Appendix XC), the endotoxin content of each YPEG-IFN-a2b sample was less than 5.0 EU / mg.
(5) In vivo activity and pharmacokinetics of YPEG-IFN-a2b SP2 in animals.
□% in vivo activity of YPEG-IFN-a2b SP2 in animals.
The mechanism of action of IFN is partially to induce the production of 2 ', 5<sup>T</sup>-AS (2 ', 5'-oligoadenylate synthase), which in turn exerts its antiviral effects. Using I as a marker, the pharmacodynamic parameters of IFN are reflected by the 2 ', 5'-AS activity in vivo. The 2 ', 5'-AS catalyzes the synthesis of 2', 5'-A (2 ', 5'-oligoadenylate) of ATP in the presence of Poly (I) -Poly (C) water (the activity of 2<sup>1</sup>,5<sup>1</sup>-AS can be represented by the concentration of the synthesized 2 ', 5'-A). First, 2 ', 5'-AS in the samples is absorbed and activated by Poly (I) -Poly (C) agarose, then catalyzes the ATP substrate to result in 2', 5'-A. A mixture of 2 ', 5'-A marked by<sup>125</sup>I, anti-2 ', 5'-A and
Secondary antibodies are added to the sample which is then incubated and centrifuged to separate the mixture. The supernatant is eliminated and a gamma radiation spectrometer has been used to measure the radioactivity of the sediment. The union level of 2 ', 5'A marked with I and calculated. A 4-parameter logistic regression is used to generate a standard curve, and then the concentration of products 2 ', 5<sup>1</sup>-A induced by 2 ', 5'-AS, in an unknown sample, could be estimated.
Using the previously mentioned 2 ', 5'-A method, the results in Table 1 and FIG.7 showed the concentration of 2', 5'-A in the serum after a single subcutaneous injection of 30 pg-kg<sup>-1</sup> of YPEG-IFN-a2b SP2 in the Cinomolgos Monkey (Macaca fascicularis) (18 Cinomolgos Monkeys, Guangxi Weimei Biotechnology Co., Ltd., Certification No. S.CXK GUI 2002-0001, body weight 2.5 to 5.5, 6 females and 12 males, raised in separate structures, fed standard monkey food, with free access to water). It can be seen in FIG. 8 that the average time for the peak is 64 ± 27.71h, and the concentration for the peak was 292.301148,08 Pmol-dL<sup>-1</sup>. After administration, the activity of 2 ', 5'-AS in the serum was clearly increased, and the time for the peak of 2', 5'-A in the serum was delayed than that of YPEG-IFN-a2b SP2.
Table 1. The 2 'concentrations. Serum 5'-A over time after a single subcutaneous injection of 30 pg-kg<sup>-1</sup> of YPEG-rhlFNa2b SP2 in the Cinomolgo Monkey. (Pmol-dL<sup>-1</sup>)
<td rowspan="2">Time (H)</td><td colspan="3">No. of cynomolgus monkeys</td><td rowspan="2">Average</td><td rowspan="2"></td><td rowspan="2">SD</td>
<td> 1</td><td> 2</td><td> 3</td>
<td> 0</td><td> 19,32</td><td> 13,63</td><td> 20, 74</td><td> 17,90</td><td> +</td><td> 3, 76</td>
<td> 1</td><td> 40, 17</td><td> 218,67</td><td> —</td><td> 129,42</td><td> +</td><td> 126,22</td>
<td> 2</td><td> 45, 74</td><td> 14,30</td><td> 80,23</td><td> 46, 76</td><td> +</td><td> 32, 98</td>
<td> 4</td><td> 14,89</td><td> 69,41</td><td> 138,23</td><td> 74, 18</td><td> +</td><td> 61, 81</td>
<td> 8</td><td> 49, 12</td><td> 243,43</td><td> 141,66</td><td> 144,74</td><td> +</td><td> 97, 19</td>
<td> 10</td><td> 119,51</td><td> 274,99</td><td> 109,89</td><td> 168,13</td><td> +</td><td> 92,67</td>
<td> 12</td><td> 72, 75</td><td> 152,81</td><td> 112,87</td><td> 112,81</td><td> +</td><td> 40, 03</td>
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<td> 24</td><td> 10,05</td><td> 321,23</td><td> 159,12</td><td> 163,47</td><td> +</td><td> 155,63</td>
<td> 48</td><td> 45,60</td><td> 622,42</td><td> 164,49</td><td> 277,50</td><td> +</td><td> 304,56</td>
<td> 96</td><td> 400,67</td><td> 352,65</td><td> 123,58</td><td> 292,30</td><td> +</td><td> 148,08</td>
<td> 168</td><td> 10,87</td><td> 286,38</td><td> 4, 17</td><td> 100,47</td><td> +</td><td> 161,03</td>
<td> 240</td><td> 2, 74</td><td> 323,83</td><td> 10, 48</td><td> 112,35</td><td> ±</td><td> 183,19</td>
<td> 312</td><td> 20,65</td><td> 238,65</td><td> 1,54</td><td> 86,94</td><td> +</td><td> 131,72</td>
(2) Pharmacokinetics of YPEG-IFN-a2b and rhIFN-a2b in Monkeys
Cinomolgos
A single subcutaneous injection of 10, 30 or 100 pg-kg<sup>-1</sup> YPEGIFN-a2b was administered to cynomolgus monkeys. For the administration group, 1 ml of venous blood was collected from the posterior leg opposite the site injected the previous time, 1h, 2h, 4h, 8h, 10h, 12h, 24h, 48h, 72h, 96h, 168h, 240h and 312h later of the administration. For the group with a single subcutaneous injection of IFN-a2b (30 pg-kg ”<sup>1</sup>), 1 ml of blood was collected the previous time, 0.5h, 1h, 2h, 3h, 4h, 5h, 6h, 8h and 24h after administration. After being maintained at 4 ° C for 30 minutes, blood samples were centrifuged at 2000 rpm for 10 min. under low temperature, then the serum was separated immediately and stored at -20 ° C for further analysis.
Quantitative double sandwich immunoassay was used. A recombinant human IFN-a2b-specific monoclonal antibody was pre-coated on the microtiter plate. The standard and samples were pipetted into microtiter wells, in which IFN-a2b or YPEG-IFN-a2b SP2 would join the immobilized antibody. The plate was washed to remove free substances, and then anti-human IFN-α IgG (secondary antibody) was added to the wells. After the reaction was completed, the plate was washed and horseradish peroxidase (HRP) was added to the wells. After washing the enzymes and free reagents, the color generated when adding the HRP substrate solution to each well was proportional to the amount of IFN-a2b or YPEGrhIFN-a2b SP2 joined in the first phase. The reaction was stopped and the
25/33 color intensity was measured. The higher the OD absorbance value, the greater the concentration of IFN-a2b or YPEG-IFN-a2b SP2 in the sample. Standard curves were plotted for IFN-a2b and YPEG-IFN-a2b SP2, respectively, to measure serum drug concentration in blood samples.
According to the protocol in the kit description (American Biomedical Co., lot number 3271), 100 pl standard or blood sample was added to each well, and mixed gently with a plate mixer. According to the anticipated concentration of an unknown sample, the sample was diluted with the dilution solution to the concentration ranges of the standard curve. The standard curve of IFN-a2b or YPEG-IFN-a2b SP2 for each plate was plotted to calculate the concentration of the unknown sample on that plate. The plate was incubated at room temperature for 1 h, and washed once with plate washing solution. 100 µl of secondary antibody was added to each well, and kept at room temperature for 1h. The plate was washed 3 times, and 100 µl of HRP conjugate was added to each well. The plate was incubated at room temperature for 1h and washed 4 times. 100 pl of TMB substrate was added to each well, and kept at room temperature in the dark, for 15 min. 100 µl stop solution was added to each well, and mixed gently to stop the reaction. The OD value of the absorbance at 450 nm was measured with a microplate reader within 5 min. to determine the concentration of each sample.
After a single subcutaneous injection of low dose, medium dose, or high dose (10, 30 and 100 pg-kg ”<sup>1</sup>, respectively) of YPEG-IFNa2b in the cynomolgus monkey, the half-lives were 48.87111.67, 51.9413.52 and 49.6012.97h, respectively. After a single subcutaneous injection of 30 pg-kg<sup>-1</sup> of IFN-a2b in cynomolgus monkeys, the half-life was 3.2210.10h. The half-life of IFN-a2b was prolonged, at least ten times after the YPEG modification.
26/33 (6) The in vitro biological activity of each YPEG-IFN-a2b modifying isomer was estimated using the cytopathic inhibition assay.
According to the method described in the method of determining interferon activity (Pharmacopoeia of the People's Republic of China, 2005, Volume 3, Appendix XC), interferon protects human amniotic cells (WISH) cells from damage caused by the vesicular stomatitis (VSV). Crystal violet was used to mark surviving WISH cells, and the OD absorbance value was measured at 570 nm. The interferon protection effect curve was plotted for WISH cells to determine the in vitro biological activity of interferons. The results of the in vitro biological activity of each sample are shown in Table 2, and 3 parallel tests were performed for each sample. After YPEG modification, in all modification isomers of PEG-modified products with a single amino acid residue, the SP2 sample showed the highest specific in vitro activity, which was 1-2 times higher than SP1, SP3 and PEGASYS (manufactured by Hoffmann-La Roche, Basel, Switzerland; packaged separately by Shanghai Roche Pharmaceuticals Ltd., product batch number B1016, packaging batch number SH0020), and was also 1-2 times higher than the unresolved sample.
Table 2. Results of in vitro biological activity for each YPEG-IFN-a2b modifying isomer (3 parallel tests)
<td>Sample</td><td>PEG type</td><td>PEG MW (KD)</td><td>No. of modification positions</td><td>Average specific activity (x10<sup>6</sup>lU / mg)</td>
<td>YPEG-IFN-a2b SP1</td><td>Y-branched</td><td> 40</td><td> 1</td><td> 1,07±0,172</td>
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<td>YPEG-IFN-a2b SP2</td><td>Y-branched</td><td> 40</td><td> 1</td><td> 2,65±0,185</td>
<td>YPEG-IFN-O (2b SP3</td><td>Y-branched</td><td> 40</td><td> 1</td><td> 1,13±0,215</td>
<td>YPEG-IFN-a2b sample not resolved</td><td>Y-branched</td><td> 40</td><td> 1</td><td> 1,68±0,217</td>
<td>PEGASYS</td><td>U-branched</td><td> 40</td><td> 1</td><td> 0,934±0,042</td>
<td colspan="2">Note: the unresolved sample resolved YPEG-rhIFN-a2b by SP-</td><td colspan="3">.a refers to the sample before -Sepharose FF</td>
(7) The resolution of the modification position in YPEG-IFN-a2b SP2 solvent system YPEG-IFN-a2b SP2 was changed to 50 mM NH4HCO3 (pH 8.0) by ultrafiltration with a 5K ultrafilter (polyethersulfone material, Millipore ), and the protein concentration was determined to be 3.82 mg / ml using UV spectroscopy. TPCK trypsin (Promega) was dissolved (0.5 pg / μΙ) in the solution provided by the manufacturer. The samples were added according to Table 3:
Table 3. Composition of the YPEGIFN-a2b SP2 trypsin digestion reaction
<td>Reaction composition</td><td>Volume</td>
<td>50mM NH4HCO3, pH 8.0</td><td>7.08 ml</td>
<td>PEG-IFN-a2b SP2 (3.82 mg / ml)</td><td>1.32 ml</td>
<td>Trypsin (0.5 pg / pl)</td><td>0.2 ml</td>
<td>Total reaction volume</td><td>8.6 ml</td>
The reaction system was kept in a water bath at 37 ° C for 48h, then 1.52 ml of 20% acetic acid was added to stop the reaction. A small amount of sample was taken for mapping HPLC-RP C18 peptides. The instrument for analysis was the HPLC Waters system, with a controller of the
28/33 type 600, dual wavelength detector 2487, and the data processing software was Empower 2. The HPLC analytical column was Jupiter C 18 (particle diameter 5 pm, pore diameter 300Â, .64.6 x 150 min., Produced by Phenomenex, USA). The mobile phase A was 0.1% TFNH<sub>2</sub>O, the mobile phase B was 0.1% TFA / 90% ACN / H<sub>2</sub>O, the flow rate was 1 ml / minute, and the detection wavelength was set at 214 nm. Refer to Table 4 for the elution gradients, and the results are shown in FIG.8-10.
Table 4. Elution gradients for peptide mapping
HPLC-RP C18 YPEG-IFN-a2b SP2 digested by trypsin
<td></td><td>Time (minutes)</td><td>THE%</td><td>B%</td><td>ACN%</td>
<td> 1</td><td> 0</td><td> 100</td><td> 0</td><td> 0</td>
<td> 2</td><td> 8</td><td> 100</td><td> 0</td><td> 0</td>
<td> 3</td><td> 68</td><td> 40</td><td> 60</td><td> 54</td>
<td> 4</td><td> 72</td><td> 40</td><td> 60</td><td> 54</td>
<td> 5</td><td> 75</td><td> 100</td><td> 0</td><td> 0</td>
<td> 6</td><td> 80</td><td> 100</td><td> 0</td><td> 0</td>
Based on the detection result, it can be determined that the sample has been almost completely digested. The products were treated with DTT reduction after the reaction was stopped. The Sephacryl S-100HR column (φ18 x 255 mm, 1CV = 64 ml; GE Healthcare) was pre-equilibrated with 3CV of 20 mM PBNa-400 mM NaCl (pH 7.0), and 3% CV of the sample YPEG-IFN-a2b SP2 by trypsin digested TPCK was fully loaded by hydrostatic pressure. 20 mM PBNa-400 mM NaCl (pH 7.0) were used for elution, and the detection wavelength was set to 280 nm. The sample from the first elution peak was collected (sample number: YPEG-IFN-a2b S100-1; FIG.11), and the solvent system was changed to 5 mM PBNa (pH 7.0) with ultrafilter 5K. Vacuum lyophilization was carried out. The N amino acids
29/33 terminals of the lyophilized sample were determined when using the Edman degradation, and the sequence of the 7 amino acids in the sample N-terminal was XYSPXAW (Table 5), characterized by X denoting a cysteine α-amino acid (Cys), a non-α -amino acid or other modified amino acid that cannot be detected using Edman degradation. According to the sequence shown in SEQ ID NO. : 1, it can be determined that YPEG-IFN-a2b SP2 was mainly products modified with YPEG in Lysl34.
Table 5. Result of the sequencing for the amino acids Nterminal of YPEG-IFN-a2b S100-1
<td>Sample</td><td>Detected N-terminal sequence</td><td>The corresponding PEG change position.</td>
<td>YPEG-IFN-a2b S100-1</td><td>XYSPXAW</td><td>Lysl34</td>
<td colspan="3">Note: X denotes α-amino acid cysteine, a non-α-amino acid or other modified amino acid that cannot be detected using Edman degradation</td>
Sequence listing <110> BIOSTEED GENE EXPRESSION TECH. CO., LTD.
<120> ALFA 2B INTERFERED MODIFIED WITH POLYETHYLENE GLYCOL
PREPARATION METHOD AND APPLICATIONS OF THE SAME <130> P2007474C <160> 1 <170> Patentln version 3.3 <210> 1 <211> 165
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Ser Arg Arg Thr Leu Met <212> PRT <213> Homo sapiens <400> 1
Cys Asp Leu Pro Gin Thr His ser Leu 1 5
Leu Leu Ala Gin Met Arg Arg ile ser 20 25
Arg His Asp Phe Gly Phe Pro Gin Glu 35 40
Lys Ala Glu Thr Ile Pro val Leu His 50 55
Asn Leu Phe Ser Thr Lys Asp Ser Ser 65 70
Leu Asp Lys Phe Tyr Thr Glu Leu Tyr 85
Ward Cys Val Ile Gin Gly Val Gly val
100 105
Glu Asp ser ile Leu Ala val Arg Lys 115 120
Tyr Leu Lys Glu Lys Lys Tyr Ser Pro
130 135
Wing Glu Ile Met Arg ser Phe Ser Leu 145 150
Phe ser Cys Leu Lys Asp 30
Phe Gly Asn Gin Phe Gin 45
Met Ile Gin Gin Ile Phe 60
Wing Trp Asp Glu Thr Leu 75 80
Gin Leu Asn Asp Leu Glu 95
Glu Thr Pro Leu Met Lys 110
Phe Gin Arg Ile Thr Leu 125
Wing Trp Glu Val val Arg 140
Thr Asn Leu Gin Glu Ser 155 160
Read Arg be Lys Glu
165
Lisbon, June 4, 2012
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REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the Holder has the sole purpose of helping the reader and is not part of the European patent document. Although the utmost care has been taken in its preparation, errors or omissions cannot be excluded and the EPO does not assume any responsibility in this regard.
Patent Application Documents cited in the description • US UP4179337 A · EP 0809996 A • US 4179337 A · CN 1243779 C • EP 0593868 A
Literature cited in the description that is not a Patent Application • Kenji Oritani; Paul W Kincade et al. Type I interferon and limitin: a comparison of structures, receptors, and functions Cytokine and Growth Factor Reviews, 2001, vol. 12, 337-348 • Yu-Sen Wang; Stephen Youngster et al. Structural and biological characterization of PEGylated recombinant interferon alpha-2b and its therapeutic implications Advance Drug Delivery Reviews, 2002, vol. 54, 547-570 • Henco K .; Brosius FJ et al. J. Mol. Biol., 1985, vol.
185, 227-260 • Inada et al. J. Bioact. and Compatible Polymers, 1990, vol.
5, 343 • Delgado et al. Critical Reviews in Therapeutic Drug Carrier Systems, 1992, vol. 9, 249
32/33 • Katre. Advanced Drug Delivery Systems, 1993, vol. 10, 91 • Satake-Ishikawa et al. Cell Structure and Function, 1992, vol. 17, 157-160 • Katre et al. Proc. Natl. Acad. Know. USA, 1987, vol. 84,
1487 • Tsutsumi et al. Jpn. J. Cancer Res., 1994, vol. 85.9 • Inoue et al. J. Lab. Clin. Med., 1994, vol. 124, 529 • Chamow et al. Bioconj. Chem., 1994, vol. 5,133 • Monfardini et al. Bioconjugate Chem., 1995, vol. 6.62 • Yu-Sen Wang et al. Advanced Drug Delivery Reviews, 2002, vol. 54, 547-570 • Yu-Sen Wang et al. Biochemistry, 2000, vol. 39, 10634-10640 • Laemmli et al. Nature, 1970, vol. 227, 680 • Pharmacopoeia of the People's Republic of China, 2005, vol. 3 • Determination Method of Interferon Activity Pharmacopoeia of the People's Republic of China, 2005, vol. 3
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Contents12
11 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5 Sheet 6 Sheet 7 Sheet 8 Sheet 9 Sheet 10 Sheet 11
29 members in 17 offices
Priority claims3
| Document | Office | Kind | Date |
|---|---|---|---|
| 2007002644 | China | W | |
| 2007002644 | China | W | |
| WO2007CN02644 | – | – | – |
Members29
| Document | Office | Kind | |
|---|---|---|---|
| AU2007358605A1 | Australia | A1 | |
| CA2698173A1 | Canada | A1 | |
| WO2009030066A1 | World Intellectual Property Organization (WIPO) | A1 | |
| CN101636414A | China | A | |
| EP2186830A1 | European Patent Office (EPO) | A1 | |
| KR20100082774A | Republic of Korea | A | |
| EP2186830A4 | European Patent Office (EPO) | A4 | |
| JP2010538022A | Japan | A | |
| ZA201001556B | South Africa | B | |
| US2011158943A1 | United States of America | A1 | |
| AU2007358605B2 | Australia | B2 | |
| RU2010106430A | Russian Federation | A | |
| MX2010002557A | Mexico | A | |
| AU2007358605B8 | Australia | B8 | |
| CN101636414B | China | B | |
| EP2186830B1 | European Patent Office (EPO) | B1 | |
| AT548382T | Austria | T | |
| DK2186830T3 | Denmark | T3 | |
| ES2382124T3 | Spain | T3 | |
| PT2186830EThis record | Portugal | E | |
| PL2186830T3 | Poland | T3 | |
| RU2485134C2 | Russian Federation | C2 | |
| JP5325884B2 | Japan | B2 | |
| US8597635B2 | United States of America | B2 | |
| BRPI0721984A2 | Brazil | A2 | |
| CA2698173C | Canada | C | |
| KR101502645B1 | Republic of Korea | B1 | |
| BRPI0721984B1 | Brazil | B1 | |
| BRPI0721984B8 | Brazil | B8 |
Numbers
- Publication, DOCDB
- 2186830
- Publication, EPODOC
- PT2186830E
- Application
- 7800861
- Application, DOCDB
- 07800861
- Application, EPODOC
- PT20070800861T
Titles2
- English
- POLYETHYLENE GLYCOL MODIFIED INTERFERON ALPHA 2B AND PREPARATION METHOD AND APPLICATIOINS THEREOF
- Portuguese
- INTERFERÃO ALFA 2B MODIFICADO COM POLIETILENOGLICOL E MÉTODO DE PREPARAÇÃO E APLICAÇÕES DO MESMO
Classification
- CPC, 16
- C07K14/56
- A61K38/00
- A61K47/60
- A61P1/16
- A61P11/00
- A61P11/06
- A61P19/02
- A61P25/00
- A61P29/00
- A61P31/12
- A61P31/14
- A61P31/20
- A61P35/00
- A61P35/02
- A61P37/02
- Y02A50/30
- IPC, 12
- C07K14 56
- A61K38 21
- A61K47 48
- A61P1 16
- A61P11 00
- A61P11 06
- A61P19 02
- A61P25 00
- A61P31 12
- A61P35 00
- C07K14 48
- C07K17 08