RAPID LOSS OF STRESS FIBERS IN CHINESE-HAMSTER OVARY CELLS AFTER HYPERTHERMIA

  • 1 January 1985
    • journal article
    • research article
    • Vol. 45  (1) , 258-262
Abstract
The effect of hyperthermia (54.degree.) on the distribution of actin stress fibers was studied in Chinese hamster ovary cells using rhodamine-conjugated phalloidin, a probe specific for F-actin. Fluorescent microscopy revealed a rapid loss of stress fibers after immmersion in a 45.degree. water bath. After 5-min immersion at 45.degree., .apprx. 90% of the cells analyzed did not contain observable stress fibers. Stress fibers were visible after incubation of cells at 37.degree. after heating. The recovery of the appearance of the stress fibers occurred as protein synthesis resumed and addition of protein synthesis inhibitors following heat treatment blocked the reappearance of these structures. The hypothesis that cytoskeletal components may be a target of hyperthermia was supported, thus explaining the pleotropic biological effects of heat and, in particular, heat radiosensitization. [The use of hyperthermia as an adjuvant to radiotherapy and chemotherapy was outlined.].