title: IL-6 enhanced the retinoic acid-induced differentiation of human acute promyelocytic leukemia cells.
abstract: It has been shown that retinoic acid (RA) induced the expression of interleukin-6 (IL-6) in human acute promyelocytic leukemia HL-60 cells. In the present study, we examined the ability of RA to induce the expression of gp130, the signal-transducing receptor component for IL-6, in HL-60 and a RA-supersensitive cell line HL-60/S4. We found that RA induced the expression of gp130, at both the mRNA and protein levels, in HL-60 and HL-60/S4 cells. Interestingly, the induction of gp 130 expression observed in the RA-supersensitive HL-60/S4 cells was much more pronounced than that observed in HL-60 cells. Furthermore, activation of the RA-induced gp130 by exogenous IL-6 potentiated the differentiating effects of RA. The synergistic effects observed for IL-6 and RA was also much stronger in HL-60/S4 cells than in HL-60 cells. Our findings suggest that the differentiating effects of RA may partially be mediated by the up-regulation of IL-6/gp130 signaling in HL-60 and HL-60/S4 cells.
authors.affiliation: Department of Biology, The Hong Kong University of Science and Technology, China.
authors.forename: P
authors.initials: P
authors.lastname: Xie
authors.forename: F S
authors.initials: FS
authors.lastname: Chan
authors.forename: N Y
authors.initials: NY
authors.lastname: Ip
authors.forename: M F
authors.initials: MF
authors.lastname: Leung
mesh_terms: D015703:Antigens, CD / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology; D000970:Antineoplastic Agents / Q000494:pharmacology*; D002454:Cell Differentiation / Q000187:drug effects; D050822:Cytokine Receptor gp130; D004357:Drug Synergism; D015973:Gene Expression Regulation, Leukemic / Q000187:drug effects; D018922:HL-60 Cells; D006801:Humans; D015850:Interleukin-6 / Q000494:pharmacology*; D015474:Isotretinoin / Q000494:pharmacology*; D015473:Leukemia, Promyelocytic, Acute / Q000473:pathology*; D008562:Membrane Glycoproteins / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism; D011994:Recombinant Proteins / Q000494:pharmacology; D014212:Tretinoin / Q000494:pharmacology*; D015854:Up-Regulation / Q000187:drug effects
chemical_list: D015703:Antigens, CD; D000970:Antineoplastic Agents; C494199:IL6ST protein, human; D015850:Interleukin-6; D008562:Membrane Glycoproteins; D012333:RNA, Messenger; D011994:Recombinant Proteins; D050822:Cytokine Receptor gp130; D014212:Tretinoin; D015474:Isotretinoin