Abstract:
:We previously reported synergistic induction of apoptosis by IFN-gamma plus either cyclosporin A (CsA) or tacrolimus (FK506) in gastric carcinoma cells. In this study, we aimed to elucidate the mechanism for this synergistic induction of apoptosis. IFN-gamma plus CsA synergistically induced caspase-3 mediated apoptosis in gastric carcinoma cells. Although IFN-gamma induced activation of signal transducer and activator of transcription1 (STAT1) and expression of interferon regulatory factor-1 (IRF-1) mRNA, IFN-gamma alone was not able to induce caspase-3 activation and apoptosis. When gastric carcinoma cells were treated with cyclohexamide, a protein synthesis inhibitor, following IFN-gamma pretreatment, caspase-3 was activated, and apoptosis was markedly induced. These findings suggest the existence of IFN-gamma-induced anti-apoptotic pathway and we evaluated the effect of IFN-gamma and CsA on calcium-sensitive nuclear factor-kappa B (NF-kappa B) activation. IFN-gamma increased intracellular calcium ion concentration ([Ca(2+)](i)) consisting of a spike and a sustained phase, and the latter was completely abrogated by CsA. Activation of NF-kappa B occurred in response to IFN-gamma, and which was markedly inhibited by either CsA or FK506. NF-kappa B decoy also enhanced the cytotoxic effect of IFN-gamma. These results suggest that IFN-gamma may simultaneously induce the STAT1-mediated apoptotic pathway and the anti-apoptotic pathway through calcium-activated NF-kappa B and that inhibition of the latter by CsA may result in dominance of the apoptosis-inducing pathway.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Beppu K,Morisaki T,Matsunaga H,Uchiyama A,Ihara E,Hirano K,Kanaide H,Tanaka M,Katano Mdoi
10.1016/s0006-291x(03)00853-2subject
Has Abstractpub_date
2003-06-13 00:00:00pages
797-805issue
4eissn
0006-291Xissn
1090-2104pii
S0006291X03008532journal_volume
305pub_type
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