Development of thermotolerance in CHO cells: modification by procaine

Area of Science:

• Cellular and Molecular Biology
• Biophysics
• Cancer Research

Background:

• Thermotolerance is a protective cellular response to heat stress.
• Procaine is a local anesthetic with reported effects on cellular processes.
• Understanding drug interactions with cellular stress responses is crucial for therapeutic development.

Purpose of the Study:

• To investigate the effect of procaine on the induction and development of thermotolerance in Chinese hamster ovary (CHO) cells.
• To determine if procaine inhibits or enhances heat-induced thermotolerance.
• To assess the impact of procaine concentration and exposure timing on thermotolerance.

Main Methods:

• Chinese hamster ovary cells were subjected to conditioning heat treatments (hyperthermia alone or with procaine).
• Thermotolerance development was assessed by measuring cell survival after subsequent heat exposures.
• Procaine toxicity at 37°C was accounted for in survival calculations.

Main Results:

• Thermotolerance induction and development were largely unaffected by procaine when conditioning treatments yielded similar cell survival.
• Thermotolerance developed even in the presence of 10 mM procaine, provided procaine's inherent toxicity was corrected.
• Procaine showed minimal perturbation of thermotolerance induction and development, despite known sensitization to heat killing.

Conclusions:

• Procaine does not significantly inhibit the induction or development of thermotolerance in CHO cells.
• The cellular response of thermotolerance remains largely intact even with procaine exposure.
• Findings suggest that procaine's interaction with heat stress responses is complex and warrants further investigation.