title: Does any relationship exist between P-glycoprotein-mediated multidrug resistance and intracellular calcium homeostasis.
abstract: Multidrug resistance (MDR) of neoplastic tissue represents a real obstacle to the effective chemotherapy of cancer. Several mechanisms of MDR were identified, from which the over-expression and efflux activity of P-glycoprotein (P-gp) - a plasma membrane ATPase (ABCB1 member of ABC transporter family) - represents the most commonly observed reason for neoplastic disease chemotherapy malfunction. The process of P-gp-mediated MDR seems to be related to intracellular calcium homeostasis, at least indirectly, for the following reasons: i. substances blocking calcium influx through L-type of calcium channels like verapamil were often found to antagonize P-gp-mediated MDR; ii. calcium signal abnormalities were observed in cells over-expressing P-gp; iii. cells with P-gp-mediated MDR were often resistant to thapsigargin; iv. several differences in intracellular calcium localization were observed when P-gp-negative and P-gp-positive cells were compared; and v. differences in the contents of several proteins of the endoplasmic reticulum involved in calcium homeostasis were observed to be associated with P-gp over-expression. This current study represents an attempt to summarize the knowledge about the possible relationship between P-gp-mediated MRD and intracellular calcium homeostasis.
authors.affiliation: Institute of Molecular Physiology and Genetics, Slovak Academy of Sciences, Centre of Excellence of the Slovak Research and Development Agency BIOMEMBRANES2008, 833 34 Bratislava, Slovakia.
authors.forename: Zdenka
authors.initials: Z
authors.lastname: Sulová
authors.forename: Mário
authors.initials: M
authors.lastname: Seres
authors.forename: Miroslav
authors.initials: M
authors.lastname: Barancík
authors.forename: Lenka
authors.initials: L
authors.lastname: Gibalová
authors.forename: Branislav
authors.initials: B
authors.lastname: Uhrík
authors.forename: Lenka
authors.initials: L
authors.lastname: Poleková
authors.forename: Albert
authors.initials: A
authors.lastname: Breier
mesh_terms: D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000378:metabolism*; D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002460:Cell Line; D004305:Dose-Response Relationship, Drug; D018432:Drug Resistance, Multiple; D004721:Endoplasmic Reticulum / Q000378:metabolism; D005786:Gene Expression Regulation; D006706:Homeostasis; D006801:Humans; D020128:Inhibitory Concentration 50; D051379:Mice; D008954:Models, Biological
chemical_list: C513055:ABCB1 protein, human; D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D002118:Calcium