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Related Experiment Videos

Decrease in calcium currents induced by aminoglycoside antibiotics in frog motor nerve endings

R S Redman1, E M Silinsky

  • 1Department of Molecular Pharmacology and Biological Chemistry, Northwestern University Medical School, Chicago, IL 60611.

British Journal of Pharmacology
|October 1, 1994
PubMed
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Aminoglycoside antibiotics like streptomycin reduce calcium currents and acetylcholine release at frog nerve endings. This explains their inhibitory effect on neuromuscular junctions.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Molecular Biology

Background:

  • Aminoglycoside antibiotics are known to have neuromuscular side effects.
  • The precise mechanism underlying these effects at the motor nerve terminal is not fully understood.

Purpose of the Study:

  • To investigate the effects of aminoglycoside antibiotics on perineural currents and acetylcholine release at frog motor nerve endings.
  • To elucidate the role of calcium (Ca2+) currents in the presynaptic inhibitory actions of these antibiotics.

Main Methods:

  • Electrophysiological recordings of perineural currents and evoked acetylcholine release in frog motor nerve preparations.
  • Application of streptomycin, neomycin, and gentamicin in varying concentrations.

Main Results:

Related Experiment Videos

  • Streptomycin reduced the peak amplitude of Ca2+ currents in standard solutions.
  • In a simultaneous recording setup, all tested aminoglycosides (neomycin > streptomycin > gentamicin) reduced both Ca2+ currents and evoked acetylcholine release.
  • The observed potency order mirrors that for inhibition of mammalian skeletal muscle contractions.

Conclusions:

  • Aminoglycoside antibiotics inhibit neuromuscular transmission by reducing Ca2+ influx into the motor nerve terminal.
  • This reduction in Ca2+ currents is the primary mechanism responsible for the presynaptic inhibitory effects of these drugs.