US20020037522A1

Gene encoding a multidrug resistance human P-glycoprotein homologue on chromosome 7p15-21 and uses thereof

Claim Score by NHIP

Read claim 11, the broadest

Abstract

The invention relates to an MDR family P-glycoprotein located on human chromosome 7p15-21, polynucleotide sequences encoding this P-glycoprotein and fragments thereof. This gene is utilized in methods for assessing cancer cell susceptibility to therapies directed against multidrug resistance, and for the design of diagnostic and therapeutic methods relating to cancer multidrug resistance. The invention also relates to methods for determining whether a test compound may inhibit multidrug resistance.

Term

Term ended

Projected expiry passed 5 June 2021, 5.3 years ago.

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17 claims: 7 independent, 10 dependent

  1. 1
    A substantially pure protein consisting essentially of an amino acid sequence selected from the group consisting of:SEQ ID NO:1;SEQ ID NO:2;SEQ ID NO:3;SEQ ID NO:4;SEQ ID NO:5;SEQ ID NO:6;SEQ ID NO:7;and SEQ ID NO:8.
  2. 2
    A peptide consisting of a sequence element derived from any one of:SEQ ID NO:1;SEQ ID NO:2;SEQ ID NO:3;SEQ ID NO:4;SEQ ID NO:5;SEQ ID NO:6;SEQ ID NO:7;or SEQ ID NO:8;wherein said peptide is at least 10 residues in length, and with the proviso that said sequence is not the same as any contiguous 10-15 amino acids in the sequence LSGGQKQRIAIARAL.
  3. 3
    An antibody made by a process comprising the step of administering the protein or peptide of any one of claims 1 - 2 to an animal capable of producing said antibody, wherein said protein or peptide is administered at a dosage sufficient to induce antibody formation in said animal.
  4. 10
    An oligonucleotide that acts as an antisense inhibitor of P-glycoprotein expression, wherein said oligonucleotide is at least 15 nucleotides in length and consists of a sequence complementary to at least 15 contiguous nucleotides in any one of:SEQ ID NO:9;SEQ ID NO:10;SEQ ID NO:11;SEQ ID NO:12;SEQ ID NO:13;SEQ ID NO:14;SEQ ID NO:15;or SEQ ID NO:16.
  5. 11
    Broadest claimClaim Score 98, very broad(NHIP)A vector for expressing protein, comprising a distinct coding element consisting of the polynucleotide of claims 9 .
  6. 13
    A method of determining whether a cancer cell will respond to a therapy aimed at reversing multidrug resistance, comprising the step of measuring the expression of a gene encoding a protein selected from the group consisting of:SEQ ID NO:1;SEQ ID NO:2;SEQ ID NO:3;SEQ ID NO:4;SEQ ID NO:5;SEQ ID NO:6;SEQ ID NO:7;and SEQ ID NO:8.
  7. 16
    A method of determining whether a test compound inhibits multidrug resistance caused by a gene encoding a protein selected from the group consisting of:SEQ ID NO:1;SEQ ID NO:2;SEQ ID NO:3;SEQ ID NO:4;SEQ ID NO:5;SEQ ID NO:6;SEQ ID NO:7;and SEQ ID NO:8;said method comprising: (a) expressing said gene in cells that are otherwise not multidrug resistance;(b) exposing said cells to one or more cytotoxic agents in the presence of said test compound;(c) measuring cellular survival after exposing cells to said one or more cytotoxic agents and comparing results obtained in step (b) with those from cells incubated in essentially the same manner with said cytotoxic agents but in the absence of said test compound;and (d) concluding that said test compound inhibits multidrug resistance if cellular survival is decreased to a significant extent by incubation of cells in the presence of said test compound relative to cell survival in incubations carried out in the absence of said test compound.