Abstract
(1) Preincubation of SKOV3 human ovarian carcinoma cells with a non-toxic dose of Geldanamycin resulted in exacerbation of hyperthermia-induced cytotoxicity and re-distribution of dying cells toward necrosis. (2) Exposure of primary human ovarian carcinoma cells to mild hyperthermia (42 °C for 2 h) led, after a recovery period of 16 h, to several-fold increase in the levels of Hsp90 and ErbB2, to a moderate decrease in the levels of phospho-Erk1/2, whereas the level of β-catenin appeared to be unchanged. (3) The inhibitors of Hsp90 (Geldanamycin and Novobiocin) significantly affected the cell signaling of heat-pretreated cultures. (4) The results suggest that Hsp90 plays a pivotal role in cell response to hyperthermia. (5) A combination of Hsp90 inhibitors with hyperthermia may considerably increase the efficacy of thermotherapy.
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