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Related Experiment Videos

Stability of heating temperature on cytotoxicity.

P S Lin1, A Wu, K C Ho

  • 1Department of Therapeutic Radiology, Tufts-New England Medical Center, Boston, MA 02111.

International Journal of Radiation Oncology, Biology, Physics
|December 1, 1987
PubMed
Summary

Temperature fluctuations in clinical hyperthermia impact cell survival. Longer alternating heat cycles significantly affect cytotoxicity, while gamma-ray radiation does not alter these effects.

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Area of Science:

  • Cellular biology
  • Hyperthermia research
  • Radiation oncology

Background:

  • Clinical hyperthermia often involves fluctuating temperatures.
  • Understanding the cytotoxic effects of temperature variations is crucial for optimizing cancer treatment.
  • Previous research has focused on constant temperature hyperthermia.

Purpose of the Study:

  • To investigate the cytotoxic effects of alternating temperature protocols in Chinese hamster V79 cells.
  • To determine how the duration of temperature alternation influences cell survival.
  • To assess the combined effects of fluctuating hyperthermia and gamma-ray radiation.

Main Methods:

  • Chinese hamster V79 cells were exposed to two alternating temperature protocols (42-43°C and 42-44°C) with equal thermal doses.

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  • Temperature alternation periods varied (5, 10, and >20 minutes).
  • Cells were also treated with 500 cGy gamma-ray radiation before or after heat exposure.

    • Main Results:

    • Short temperature alternations (5-10 minutes) showed minimal difference in cytotoxicity regardless of initial temperature.
    • Longer alternations (>20 minutes) resulted in substantial differences in cell survival based on initial temperature.
    • Cellular response was consistent across logarithmic and plateau growth phases; gamma-ray radiation did not significantly alter heat effects.

    Conclusions:

    • The duration of temperature fluctuation is a critical factor in hyperthermia-induced cytotoxicity.
    • Mechanisms like thermotolerance and step-down heating likely contribute to observed cell survival differences.
    • Alternating temperature hyperthermia efficacy is influenced by the timing and duration of temperature shifts, independent of concurrent gamma-ray radiation.