Abstract

Phosphatidylinositol 3 kinases (PI-3 kinases) play a crucial role in the inositol phospholipid signaling pathway. The effect of wortmannin, an inhibitor of PI-3 kinases, on the suppression of thermotolerance development was investigated in the temperature-sensitive cell line tsAF8. When wortmannin was added immediately after the preheating, the thermotolerance was suppressed, with this suppression being dose-dependent from 0.01 to 0.1 microM, but not dose-dependent from 0.1 to 20 microM. Our results suggest that PI-3 kinases might play an important role in thermotolerance development in tsAF8 cells.

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