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ATP-sensitive potassium channels and skeletal muscle function in vitro
E O Weselcouch1, C Sargent, M W Wilde
1Bristol-Myers Squibb Pharmaceutical Research Institute, Princeton, New Jersey.
The Journal of Pharmacology and Experimental Therapeutics
|October 1, 1993
Summary
ATP-modulated potassium channel (KATP) openers worsened skeletal muscle ischemia in vitro. However, these compounds aided functional recovery after reperfusion, suggesting potential therapeutic benefits for ischemia-reperfusion injuries.
Area of Science:
- Biochemistry
- Physiology
- Pharmacology
Background:
- ATP-modulated potassium channels (KATP) play crucial roles in cellular function.
- Skeletal muscle ischemia leads to impaired muscle function and potential tissue damage.
Purpose of the Study:
- To investigate the effects of KATP openers on skeletal muscle function during in vitro ischemia and subsequent reperfusion.
- To determine the therapeutic potential of KATP openers in managing skeletal muscle ischemia.
Main Methods:
- Isolated rat extensor digitorum longus muscles were subjected to electrical field stimulation.
- Muscles were exposed to normoxic and anoxic conditions with and without KATP openers (cromakalim, P-1075, pinacidil).
- Muscle force, function loss, and recovery upon reoxygenation were measured.
Main Results:
- KATP openers did not affect muscle force during normoxia.
- During anoxia, KATP openers accelerated the loss of muscle function in a concentration-dependent manner.
- Glyburide blocked the effects of KATP openers, confirming KATP channel mediation.
- KATP openers enhanced functional recovery after reoxygenation.
Conclusions:
- KATP openers exacerbate skeletal muscle ischemia and are unlikely to be beneficial for in vivo ischemia treatment.
- KATP openers show potential for preserving skeletal muscle function in ischemia-reperfusion scenarios.