title: [Expression and function of proteins associated with multidrug resistance].
abstract: We have identified the proteins specifically expressed in multidrug-resistant tumor cells and studied the functions of these proteins. The 170-to 180-kDa membrane glycoprotein (P-glycoprotein) is an ATPase which works as a pump molecule transporting chemotherapeutic drugs outside the resistant cells. The 22-kDa soluble protein (sorcin) is a calcium binding protein of unknown function. The 85-kDa membrane protein is specifically expressed in adriamycin-resistant cells and induced by treatment with adriamycin, suggesting a mechanism unique for adriamycin resistance. Our monoclonal antibodies to these proteins may well become useful tools for the diagnosis of clinical drug resistance.
authors.affiliation: Cancer Chemotherapy Center, Japanese Foundation for Cancer Research.
authors.forename: H
authors.initials: H
authors.lastname: Hamada
authors.forename: T
authors.initials: T
authors.lastname: Tsuruo
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000251:Adenosine Triphosphatases / Q000302:isolation & purification / Q000378:metabolism / Q000502:physiology; D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis; D000970:Antineoplastic Agents / Q000494:pharmacology*; D002135:Calcium-Binding Proteins / Q000302:isolation & purification / Q000378:metabolism; D006224:Cricetinae; D004317:Doxorubicin / Q000494:pharmacology; D004351:Drug Resistance; D006801:Humans; D008562:Membrane Glycoproteins / Q000302:isolation & purification / Q000378:metabolism / Q000502:physiology; D008565:Membrane Proteins / Q000302:isolation & purification / Q000378:metabolism / Q000502:physiology*; D051379:Mice; D008970:Molecular Weight
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000911:Antibodies, Monoclonal; D000970:Antineoplastic Agents; D002135:Calcium-Binding Proteins; D008562:Membrane Glycoproteins; D008565:Membrane Proteins; C503113:SRI protein, human; C503114:Sri protein, mouse; D004317:Doxorubicin; D000251:Adenosine Triphosphatases