title: Impact of BCRP/MXR, MRP1 and MDR1/P-Glycoprotein on thermoresistant variants of atypical and classical multidrug resistant cancer cells.
abstract: The impact of the ABC transporters breast cancer resistance protein/mitoxantrone resistance associated transporter (BCRP/MXR), multidrug resistance-associated protein 1 (MRP1) and multidrug resistance gene-1/P-glycoprotein (MDR1/PGP) on the multidrug resistance (MDR) phenotype in chemoresistance and thermoresistance was investigated in the parental human gastric carcinoma cell line EPG85-257P, the atypical MDR subline EPG85-257RNOV, the classical MDR subline EPG85-257RDB and their thermoresistant counterparts EPG85-257P-TR, EPG85-257RNOV-TR and EPG85-257RDB-TR. Within the atypical MDR subline EPG85-257RNOV expression of BCRP/MXR and of MRP1 were clearly enhanced (vs. parental and classical MDR lines). MDR1/PGP expression was distinctly elevated in the classical MDR subline EPG85-257RDB (vs. parental and atypical MDR sublines). In all thermoresistant counterparts basal expression of BCRP/MXR, MRP1 and MDR1/PGP was increased relative to thermosensitive sublines. Although it could be shown that the overexpressed ABC transporters were functionally active, however, no decreased drug accumulations of doxorubicin, mitoxantrone and rhodamine 123 were observed. Thus, expression of BCRP/MXR, MRP1 and MDR1/PGP was found to be dependent on the appropriate type of chemoresistance; correlating with a classical or atypical MDR phenotype. Within the thermoresistant variants, however, the increase in ABC transporter expression did obviously not influence the MDR phenotype.
authors.affiliation: Max-Delbrück-Center for Molecular Medicine, Berlin, Germany. ustein@mdc-berlin.de
authors.forename: Ulrike
authors.initials: U
authors.lastname: Stein
authors.forename: Hermann
authors.initials: H
authors.lastname: Lage
authors.forename: Andreas
authors.initials: A
authors.lastname: Jordan
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Walther
authors.forename: Susan E
authors.initials: SE
authors.lastname: Bates
authors.forename: Thomas
authors.initials: T
authors.lastname: Litman
authors.forename: Peter
authors.initials: P
authors.lastname: Hohenberger
authors.forename: Manfred
authors.initials: M
authors.lastname: Dietel
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics / Q000378:metabolism*; D000070997:ATP Binding Cassette Transporter, Subfamily G, Member 2; D018528:ATP-Binding Cassette Transporters / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism*; D000903:Antibiotics, Antineoplastic / Q000494:pharmacology; D000970:Antineoplastic Agents / Q000378:metabolism / Q000494:pharmacology; D002121:Calcium Channel Blockers / Q000494:pharmacology; D017931:DNA Primers / Q000737:chemistry; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D004317:Doxorubicin / Q000494:pharmacology; D018432:Drug Resistance, Multiple / Q000235:genetics*; D005456:Fluorescent Dyes / Q000378:metabolism; D005770:Gastrointestinal Neoplasms / Q000188:drug therapy* / Q000378:metabolism; D005786:Gene Expression Regulation; D019450:Genes, MDR / Q000502:physiology*; D006358:Hot Temperature; D006801:Humans; D007192:Indenes / Q000494:pharmacology; D008942:Mitoxantrone / Q000378:metabolism / Q000494:pharmacology; D027425:ATP-Binding Cassette, Sub-Family C Proteins; D000074081:MutS Homolog 3 Protein; D009183:Mycotoxins / Q000494:pharmacology; D009363:Neoplasm Proteins; D011422:Propionates / Q000494:pharmacology; D011804:Quinolines / Q000494:pharmacology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012334:RNA, Neoplasm / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D020112:Rhodamine 123 / Q000378:metabolism; D013274:Stomach Neoplasms / Q000188:drug therapy* / Q000378:metabolism; D014700:Verapamil / Q000494:pharmacology
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; D000903:Antibiotics, Antineoplastic; D000970:Antineoplastic Agents; D002121:Calcium Channel Blockers; D017931:DNA Primers; D004268:DNA-Binding Proteins; D004317:Doxorubicin; D005456:Fluorescent Dyes; D007192:Indenes; D008942:Mitoxantrone; D027425:ATP-Binding Cassette, Sub-Family C Proteins; D000074081:MutS Homolog 3 Protein; D009183:Mycotoxins; D009363:Neoplasm Proteins; D011422:Propionates; D011804:Quinolines; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D020112:Rhodamine 123; D014700:Verapamil; C116614:ABCG2 protein, human; C078444:MSH3 protein, human; C059141:verlukast; C421109:multidrug resistance-associated protein 1; C024743:Fumitremorgin A