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Hyperthermia-induced intracellular ionic level changes in tumor cells.

P N Yi, C S Chang, M Tallen

Radiation Research

|March 1, 1983

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Hyperthermia (high temperature) affects cellular ion balance. Potassium and chloride levels decrease in P815 cells at 43°C, impacting cellular osmolarity.

Area of Science:

Cellular Physiology
Ion Transport
Biophysics

Background:

Accurate determination of intracellular ion content, such as potassium (K), is crucial and sensitive to medium pH.
Previous studies indicate complex cellular responses to environmental changes.

Purpose of the Study:

To investigate the effects of hyperthermia on intracellular ion content and cell volume in P815 cells.
To understand the impact of elevated temperatures on cellular osmolarity.

Main Methods:

Measurement of intracellular potassium (K) and chloride content using flame emission and K analog (86Rb).
Assessment of intracellular pH and cell water volume using tritiated water.
Incubation of P815 cells at 43°C under controlled pH conditions (7.4 to 6.7).

Related Experiment Videos

Main Results:

Intracellular potassium (K) and chloride content significantly decreased at 43°C.
Sodium content remained relatively unchanged.
Intracellular pH decreased slightly, while cell water volume increased by 20% under hyperthermic conditions.
Hyperthermia resulted in an apparent deficit in cellular osmolarity.

Conclusions:

Hyperthermia disrupts the ionic balance and increases cell volume in P815 cells.
These changes collectively lead to a reduction in cellular osmolarity.
Precise control of medium pH is essential for accurate ion content measurements, especially under thermal stress.