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Temperature and synaptic efficacy in frog skeletal muscle.

B A Adams1

  • 1Department of Developmental & Cell Biology, University of California, Irvine 92717.

The Journal of Physiology
|January 1, 1989
PubMed
Summary

Low temperatures impair frog neuromuscular transmission by reducing synaptic efficacy and safety factor. This occurs due to decreased end-plate current amplitude and quantal content, not altered muscle excitability.

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Area of Science:

  • Neuroscience
  • Physiology
  • Biophysics

Background:

  • Neuromuscular transmission is vital for muscle function.
  • Understanding temperature effects is crucial for ectothermic organisms.

Purpose of the Study:

  • To investigate synaptic efficacy and safety factor at the neuromuscular junction across a temperature range.
  • To determine the mechanisms underlying temperature-dependent transmission failure.

Main Methods:

  • Intracellular recording and voltage-clamp techniques in frog skeletal muscle.
  • Measurement of synaptic efficacy, safety factor, and quantal content.
  • Assessment of postsynaptic excitability via threshold current.

Main Results:

  • Subthreshold end-plate potentials increased significantly at lower temperatures (2.5-5°C).
  • End-plate current amplitude decreased with cooling due to reduced MEPC amplitude, increased temporal dispersion, and decreased quantal content below 5°C.
  • Safety factor for neuromuscular transmission dramatically decreased from positive at 30°C to negative at 2.5°C.

Conclusions:

  • Reduced synaptic efficacy, not altered excitability, causes transmission failure at low temperatures.
  • The thermal independence of transmitter release above 5°C is key for poikilothermic animals.
  • Significant decline in quantal content below 5°C impacts neuromuscular function.

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