title: Annexin-I expression modulates drug resistance in tumor cells.
abstract: The use of anti-cancer chemotherapy often leads to the rise of multidrug-resistant (MDR) tumors. We have previously reported the overexpression of a 40kDa protein (P-40) in several MDR tumor cell lines. In this report we describe the cloning of a 1.4kb cDNA with an open reading frame of 344 amino acids that encodes the P-40 protein. Analysis of the P-40 amino acid sequence showed it is identical to the human annexin I (Anx-I) protein. The identity of the isolated P-40 cDNA as Anx-I was confirmed by the specific binding of IPM96 mAb to a 40kDa protein following the in vitro expression of P-40 full-length cDNA. Northern blot analysis of total RNA from drug-sensitive and -resistant cells revealed an increase in P-40 (or Anx-I) mRNA in drug-resistant cells relative to drug-sensitive cells. Transfection of Anx-I cDNA into drug-sensitive MCF-7 cells was carried out without further drug selection and showed 2- to 5-fold increase in resistance of transfected cells to adriamycin, melphalan, and etoposide. Conversely, transfection of reverse Anx-I cDNA into SKOV-3 cells decreased the expression of Anx-I without affecting the expression of other members of the annexin family and showed a 3- to 8-fold increase in sensitivity to these drugs. Of interest was the correlation between the presence of Anx-I and MDR in MDA-MB-231 cells when compared to MCF-7 cells. MDA-MB-231 cells show 3- to 20-fold increase in resistance to adriamycin, melphalan, and etoposide in the absence of detectable levels of P-glycoprotein (P-gp1), the multidrug resistance protein (MRP1) or the breast cancer resistance protein (BCRP). Taken together, these results provide the first direct evidence for the role of Anx-I in MDR of tumor cells.
authors.affiliation: Institute of Parasitology, McGill University, Macdonald Campus, Ste-Anne de Bellevue, Que., Canada.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.forename: Lucile
authors.initials: L
authors.lastname: Serfass
authors.forename: Marie Odile
authors.initials: MO
authors.lastname: Roy
authors.forename: Judy
authors.initials: J
authors.lastname: Wong
authors.forename: Anne Marie
authors.initials: AM
authors.lastname: Bonneau
authors.forename: Elias
authors.initials: E
authors.lastname: Georges
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000378:metabolism; D000070997:ATP Binding Cassette Transporter, Subfamily G, Member 2; D018528:ATP-Binding Cassette Transporters / Q000378:metabolism; D017305:Annexin A1 / Q000235:genetics / Q000502:physiology*; D017302:Annexins / Q000378:metabolism; D000903:Antibiotics, Antineoplastic / Q000494:pharmacology; D000970:Antineoplastic Agents / Q000494:pharmacology; D018906:Antineoplastic Agents, Alkylating / Q000494:pharmacology; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology; D015152:Blotting, Northern; D045744:Cell Line, Tumor; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004317:Doxorubicin / Q000494:pharmacology; D019008:Drug Resistance, Neoplasm; D005047:Etoposide / Q000494:pharmacology; D015723:Gene Library; D006367:HeLa Cells; D006801:Humans; D008558:Melphalan / Q000494:pharmacology; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000378:metabolism; D009363:Neoplasm Proteins / Q000378:metabolism; D016366:Open Reading Frames; D014176:Protein Biosynthesis; D012313:RNA / Q000378:metabolism; D014158:Transcription, Genetic; D014162:Transfection
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000070997:ATP Binding Cassette Transporter, Subfamily G, Member 2; D018528:ATP-Binding Cassette Transporters; D017305:Annexin A1; D017302:Annexins; D000903:Antibiotics, Antineoplastic; D000970:Antineoplastic Agents; D018906:Antineoplastic Agents, Alkylating; D000972:Antineoplastic Agents, Phytogenic; D018076:DNA, Complementary; D004317:Doxorubicin; D005047:Etoposide; D008558:Melphalan; D027425:ATP-Binding Cassette, Sub-Family C Proteins; D009363:Neoplasm Proteins; D012313:RNA; C116614:ABCG2 protein, human; C421109:multidrug resistance-associated protein 1