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Caspase-1 mediates Fas-induced apoptosis and is up-regulated by interferon-γ in human astrocytoma cells

Title
Caspase-1 mediates Fas-induced apoptosis and is up-regulated by interferon-γ in human astrocytoma cells
Authors
Choi C.Jeong E.Benveniste E.N.
Ewha Authors
최철희
Issue Date
2004
Journal Title
Journal of Neuro-Oncology
ISSN
0167-594XJCR Link
Citation
vol. 67, no. 41276, pp. 167 - 176
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Resistance to Fas-mediated apoptosis contributes to tumor evasion from the host immune system and enables tumors to mediate alternative responses such as inflammation and angiogenesis. In this study, we investigated the molecular mechanisms of the resistance to Fas-mediated apoptosis and sensitization to Fas-induced cell death by IFN-γ in human astrocytoma cells. To address this, we investigated the expression of thirty-three genes related to the Fas signal transduction pathways using RNase protection assay in five different human astrocytoma cells. Patterns of expression of these genes were similar between different cell lines and did not correlate with sensitivity to Fas-mediated cell death. Treatment with IFN-γ increased the mRNA expression of caspases-1, -4 and -7 in addition to those of Fas and TRAIL in a time- and dose-dependent manner. Studies using specific caspase inhibitors showed that Fas-induced cell death was mediated by caspases-1, -3 and 8 in the Fas-sensitive human astrocytoma cell lines, CRT-J and U87-MG. We further demonstrated that these caspases were proteolytically cleaved upon Fas ligation in these cells. Interestingly, caspase-1 protein expression but not that of caspase-3 nor -8 was up-regulated by IFN-γ only in Fas-sensitive CRT-J cells but not in Fas-resistant U373-MG cells. These results collectively suggest that caspase-1, along with caspases-3 and -8, mediate Fas-induced cell death in human astrocytoma cells, and post-transcriptional regulation of caspase-1 may determine the responsiveness to IFN-γ-induced sensitization to Fas-mediated apoptosis. © 2004 Kluwer Academic Publishers.
DOI
10.1023/B:NEON.0000021896.52664.9e
Appears in Collections:
자연과학대학 > 생명과학전공 > Journal papers
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