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Correlation between cell killing effect and cell membrane potential after heat treatment: analysis using fluorescent
Summary
Hyperthermia between 41-44°C depolarizes V-79 cell membrane potential. This membrane depolarization, particularly between 42-43°C, is significantly linked to cell death, suggesting ion channels are heat targets.
Area of Science:
- Cellular Biology
- Biophysics
Background:
- Hyperthermia (elevated temperatures) affects cellular metabolism and membrane properties.
- The plasma membrane's role in hyperthermia-induced cell death is suspected but not fully understood.
Purpose of the Study:
- To investigate the impact of hyperthermia on the transmembrane potential of V-79 cells.
- To determine the relationship between changes in membrane potential and cell survival fraction after heat treatment.
Main Methods:
- Utilized a lipophilic probe and flow cytometry to measure transmembrane potential in V-79 cells.
- Applied heat treatments ranging from 41 to 44 degrees C.
- Correlated membrane potential changes with cell survival rates.
Main Results:
- Heat treatment between 41-44°C caused immediate depolarization of the V-79 cell membrane potential.
- A statistically significant correlation was observed between membrane potential changes and cell survival, particularly between 42°C and 43°C.
Conclusions:
- The cell membrane, specifically potassium ion channels, is a likely target of hyperthermia.
- Sustained membrane depolarization following heat stress is implicated in cell death.