title: Suppression of STAT5A increases chemotherapeutic sensitivity in imatinib-resistant and imatinib-sensitive K562 cells.
abstract: STAT proteins are cytoplasmic transcription factors that are involved in the regulation of numerous cellular activities such as cell growth, differentiation, and survival. In this study, we aimed to identify the expression pattern of STAT genes in imatinib-sensitive and -resistant K562 cells, and further, to reveal the effects of STAT5A siRNA knockdown on cell growth and apoptosis induction. The XTT cell proliferation assay showed that both sensitive and resistant K562 cells were sensitized to imatinib upon transfection with STAT5A siRNA. Caspase-3 enzyme activity was increased significantly in both cells. These results may open up new opportunities to overcome chemotherapeutic resistance in leukemia.
authors.affiliation: Department of Medical Biology, Medical School, Ege University, Izmir, Turkey.
authors.forename: Buket
authors.initials: B
authors.lastname: Kosova
authors.forename: Burcin
authors.initials: B
authors.lastname: Tezcanli
authors.forename: Huseyin Atakan
authors.initials: HA
authors.lastname: Ekiz
authors.forename: Zeynep
authors.initials: Z
authors.lastname: Cakir
authors.forename: Nur
authors.initials: N
authors.lastname: Selvi
authors.forename: Aysegul
authors.initials: A
authors.lastname: Dalmizrak
authors.forename: Melis
authors.initials: M
authors.lastname: Kartal
authors.forename: Ufuk
authors.initials: U
authors.lastname: Gunduz
authors.forename: Yusuf
authors.initials: Y
authors.lastname: Baran
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects / Q000235:genetics; D001549:Benzamides; D053148:Caspase 3 / Q000378:metabolism; D049109:Cell Proliferation / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects / Q000235:genetics; D004305:Dose-Response Relationship, Drug; D019008:Drug Resistance, Neoplasm; D004789:Enzyme Activation / Q000187:drug effects; D020869:Gene Expression Profiling; D015973:Gene Expression Regulation, Leukemic; D006801:Humans; D000068877:Imatinib Mesylate; D020014:K562 Cells; D010879:Piperazines / Q000494:pharmacology*; D011743:Pyrimidines / Q000494:pharmacology*; D034622:RNA Interference; D020133:Reverse Transcriptase Polymerase Chain Reaction; D050796:STAT3 Transcription Factor / Q000235:genetics; D050799:STAT5 Transcription Factor / Q000235:genetics*; D025521:Tumor Suppressor Proteins / Q000235:genetics*
chemical_list: D000970:Antineoplastic Agents; D001549:Benzamides; D010879:Piperazines; D011743:Pyrimidines; D050796:STAT3 Transcription Factor; D050799:STAT5 Transcription Factor; C494092:STAT5A protein, human; D025521:Tumor Suppressor Proteins; D000068877:Imatinib Mesylate; D053148:Caspase 3