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[Ionic permeability of sarcoplasmic reticulum membranes damaged by x-rays]
Radiobiologiia
|May 1, 1988
Summary
Single X-irradiation increases skeletal muscle sarcoplasmic reticulum membrane permeability to calcium (Ca2+), potassium (K+), and sodium (Na+) in rabbits. This effect was most significant one hour post-irradiation.
Area of Science:
- Biophysics
- Cell Biology
- Radiation Biology
Context:
- Skeletal muscle function is critically dependent on ion gradients maintained by the sarcoplasmic reticulum.
- Understanding the effects of radiation on cellular membranes is crucial for radiation protection and therapy.
Purpose:
- To investigate the immediate effects of X-irradiation on the permeability of skeletal muscle sarcoplasmic reticulum membranes.
- To quantify the changes in ion permeability (Ca2+, K+, Na+) following localized X-irradiation.
Summary:
- A single local X-irradiation (0.21 C/kg) of rabbit hindlimbs led to increased permeability of skeletal muscle sarcoplasmic reticulum membranes to Ca2+, K+, and Na+.
- The permeability increase was observed as early as 1 and 24 hours post-irradiation, with the maximum effect noted at 1 hour.
- The enhanced permeability was more pronounced for K+ and Na+ compared to Ca2+.
Impact:
- These findings suggest that X-irradiation rapidly disrupts the ion-homeostasis mechanisms within skeletal muscle cells.
- This early membrane alteration could have significant implications for muscle function and recovery following radiation exposure.
- Provides foundational data for developing strategies to mitigate radiation-induced muscle damage.