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Hsp90-mediated inhibition of FKBP38 regulates apoptosis in neuroblastoma cells.
FEBS Letters 2007 December 12
The FK506-binding protein 38 (FKBP38) is a pro-apoptotic regulator of Bcl-2 in neuroblastoma cells. Hsp90 inhibits the pro-apoptotic FKBP38/CaM/Ca(2+) complex and thus prevents interactions between FKBP38 and Bcl-2. Here we show that Hsp90 increases cell survival rates of neuroblastoma cells after apoptosis induction. Depletion of FKBP38 by short interference RNA significantly decreased the anti-apoptotic effect of Hsp90 expression. In addition, the influence of high cellular Hsp90 levels was only observed in post-stimulation apoptosis that is sensitive to selective FKBP38 active site inhibition. Similar anti-apoptotic effects in neuroblastoma cells were observed after stimulation of endogenous Hsp90 expression. Hence, the inhibition of FKBP38 by Hsp90 participates in programmed cell death control of neuroblastoma cells.
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