Article ID Journal Published Year Pages File Type
2052567 FEBS Letters 2005 7 Pages PDF
Abstract

Little is known about the regulation of signal transducer and activator of transcription (STAT) stability. Here the osmolarity-dependence of STAT3 stability, ubiquitination, Tyr705 phosphorylation, STAT3 transactivation and γ-fibrinogen (γ-FBG) expression was studied in hepatoma cells. Hyper-osmolarity accelerated STAT3 degradation which was prevented by proteasome inhibitors. Hypo-osmolarity stabilized STAT3, most likely due to a decrease in STAT3 ubiquitination. Accordingly, STAT3 Tyr705 phosphorylation, α2-macroglobulin promoter activity and γ-FBG expression were osmosensitive. Modulation of STAT3 stability may contribute to a hydration dependence of acute phase protein expression.

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