Abstract:
:Epithelial cell apoptosis triggered cooperatively by multiple cytokines contributes to the injury induced by inflammatory responses in the lung and elsewhere. Here we show that interferon-gamma (IFN-gamma) sensitizes A549 cells, human lung epithelial cells, to cytokine-mediated apoptosis by upregulating caspase-8 expression. Pretreating the cells with IFN-gamma potentiated Fas- and TNF-related apoptosis inducing ligand (TRAIL)-induced cell death, but other forms of apoptosis, not mediated via receptors, were unaffected. Western blotting and inhibitor assays showed that IFN-gamma selectively increased expression of caspases-7 and -8, but not caspases-2, -3, -9, or -10, as a necessary step leading to apoptosis. Assaying promoter activity using a luciferase reporter gene indicated that an IFN-gamma response element was located in the 5'-flanking region of the caspase-8 gene, spanning positions -227 to -219. Taken together, these findings suggest that IFN-gamma potentiates Fas- and TRAIL-mediated apoptosis by increasing caspase-8 expression via an IFN-gamma response element in A549 cells.
journal_name
Cytokinejournal_title
Cytokineauthors
Kim KB,Choi YH,Kim IK,Chung CW,Kim BJ,Park YM,Jung YKdoi
10.1006/cyto.2003.2008keywords:
subject
Has Abstractpub_date
2002-12-21 00:00:00pages
283-8issue
6eissn
1043-4666issn
1096-0023pii
S1043466603920084journal_volume
20pub_type
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