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. 1996 Apr 1;15(7):1566–1571.

Interferon-alpha-induced phosphorylation and activation of cytosolic phospholipase A2 is required for the formation of interferon-stimulated gene factor three.

V Flati 1, S J Haque 1, B R Williams 1
PMCID: PMC450066  PMID: 8612580

Abstract

Treatment of cells with interferon (IFN)-alpha caused phosphorylation and activation of cytosolic phospholipase A2 (cPLA2). The protein tyrosine kinase Jak1 was found to be necessary for the activation of cPLA2. Jak1 could be co-immunoprecipitated with cPLA2 from cell extracts, indicating that a close physical interaction occurs between these two proteins. The induction of IFN-stimulated gene factor three (ISGF3) by IFN-alpha, is blocked by cPLA2 inhibitors in cell cultures and in cell-free reconstituted systems. However, these inhibitors do not block IFN-alpha or gamma-induced binding of STAT1 to the inverted repeat (IR) element of the IFN regulatory factor 1 (IRF-1) gene. Thus, cPLA2 activations occurs as an early event in the IFN-alpha response and is selectively involved in ISGF3-dependent gene activation.

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