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Absence of Acquired Thermotolerance in Murine Tumors Unable to Increase the Expression of Heat Shock Proteins following Stress Stimuli

The induction of thermotolerance was studied in two groups of murine tumors, one able to produce heat shock proteins (HSP) and the other entirely lacking HSP expression in response to various stress inducers. Heat treatments were performed in vitro and the development of thermotolerance was then evaluated in vivo. The data obtained on the of death rate of mice inoculated with tumor cells previously conditioned at 42 °C for 1 h and then challenged at 45 °C for 30 min following 2 h of reincubation at 37 °C, show that the rate of survival is far higher in mice inoculated with HSP negative tumor cells. This indicates that a large number of cells able to increase HSP synthesis following stress escape heat killing, whereas cells unable to express HSP after adequate stimuli are less tolerant against heat challenge.