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Fatigability of rat hindlimb muscles after acute irreversible acetylcholinesterase inhibition.

Abstract
The purpose of this study was to investigate the functional impact of acute irreversible inhibition of acetylcholinesterase (AChE) on the fatigability of medial gastrocnemius and plantaris muscles of Sprague-Dawley rats. After treatment with methanesulfonyl fluoride (a lipid-soluble anticholinesterase), which reduced their AChE activity by >90%, these muscles were subjected to an in situ indirect stimulation protocol, including a series of isolated twitch and tetanic contractions preceding a 3-min fatigue regimen (100-ms trains at 75 Hz applied every 1.5 s). During the first minute of the fatigue regimen, the effects of AChE inhibition were already near maximal, including marked reductions in peak tension and the force-time integral (area), as well as a decrement of compound muscle action potential amplitudes within a stimulus train. Neuromuscular transmission failure was the major contributor of the force decreases in the AChE-inhibited muscles. However, despite this neuromuscular transmission failure, muscles of which all AChE molecular forms were nearly completely inhibited were still able to function, although abnormally, during 3 min of intermittent high-frequency nerve stimulation.
AuthorsR Panenic, V Gisiger, P F Gardiner
JournalJournal of applied physiology (Bethesda, Md. : 1985) (J Appl Physiol (1985)) Vol. 87 Issue 4 Pg. 1455-62 (Oct 1999) ISSN: 8750-7587 [Print] United States
PMID10517778 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Cholinesterase Inhibitors
  • Isoenzymes
  • Sulfones
  • methanesulfonyl fluoride
  • Acetylcholinesterase
Topics
  • Acetylcholinesterase (metabolism)
  • Animals
  • Cholinesterase Inhibitors (pharmacology)
  • Electric Stimulation
  • Electromyography
  • Female
  • Hindlimb
  • Isoenzymes (metabolism)
  • Muscle Contraction (drug effects, physiology)
  • Muscle Fatigue (physiology)
  • Muscle, Skeletal (drug effects, innervation, physiology)
  • Nervous System Physiological Phenomena
  • Neuromuscular Junction (physiology)
  • Rats
  • Rats, Sprague-Dawley
  • Sulfones (pharmacology)
  • Synaptic Transmission (physiology)

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