title: Impact of intracellular chloride concentration on cisplatin accumulation in sensitive and resistant GLC4 cells.
abstract: Resistance to cisplatin [cis-diamminedichloroplatinum(II), CDDP] chemotherapy is a major problem in the clinic. Understanding the molecular basis of the intracellular accumulation of CDDP and other platinum-based anticancer drugs is of importance in delineating the mechanism of resistance to these clinically important therapies. Different molecular mechanisms may coexist, but defective uptake of CDDP is one of the most consistently identified characteristics of cells selected for CDDP resistance. We have studied the impact of intracellular chloride concentration on platinum-based compound accumulation in the human GLC4, GLC4/CDDP, and K562 tumor cell lines. We show that (1) a decrease of intracellular chloride concentration yielded an increase of CDDP accumulation and vice versa and (2) the intracellular chloride concentration in GLC4/CDDP cells is higher than in sensitive cells, whereas CDDP accumulation shows the opposite behavior. The identification of chloride as a critical determinant of CDDP intracellular accumulation and the molecular mechanisms by which CDDP-resistant cells modulate chloride concentration may allow alternative therapeutic approaches. Our findings indicate that increase of intracellular chloride concentration may be a major determinant of CDDP resistance.
authors.affiliation: Laboratoire de Biophysique Moléculaire Cellulaire et Tissulaire, UMR-CNRS 7033, UFR SMBH, Université Paris 13, Bobigny, France. milena.salerno@univ-paris13.fr
authors.forename: Milena
authors.initials: M
authors.lastname: Salerno
authors.forename: Dalila
authors.initials: D
authors.lastname: Yahia
authors.forename: Simplice
authors.initials: S
authors.lastname: Dzamitika
authors.forename: Elisabeth
authors.initials: E
authors.lastname: de Vries
authors.forename: Elene
authors.initials: E
authors.lastname: Pereira-Maia
authors.forename: Arlette
authors.initials: A
authors.lastname: Garnier-Suillerot
mesh_terms: D000970:Antineoplastic Agents / Q000737:chemistry / Q000378:metabolism* / Q000494:pharmacology*; D049109:Cell Proliferation / Q000187:drug effects; D002712:Chlorides / Q000032:analysis / Q000378:metabolism*; D002945:Cisplatin / Q000737:chemistry / Q000378:metabolism* / Q000494:pharmacology*; D019008:Drug Resistance, Neoplasm / Q000187:drug effects*; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D013997:Time Factors; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D002712:Chlorides; D002945:Cisplatin
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