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

Decrease in calcium currents induced by aminoglycoside antibiotics in frog motor nerve endings 1 The effects of the aminoglycoside antibiotics, streptomycin, neomycin and gentamicin were examined on perineural currents and evoked acetylcholine (ACh) release at frog motor nerve endings. 2 In the standard solutions used previously to measure Ca2+ currents, streptomycin reduced the peak amplitude of the Ca2+ component of the perineural current. 3 In a solution in which changes in both Ca2+ currents and evoked ACh release can be recorded simultaneously, both Ca2+ currents and evoked ACh release were reduced by aminoglycosides in the potency order neomycin > streptomycin > gentamicin. This potency sequence is similar to that reported previously for these agents as inhibitors of neurally‐evoked contractions of mammalian skeletal muscle. 4 These data suggest that the presynaptic inhibitory effects of aminoglycoside antibiotics at the neuromuscular junction occur as a consequence of a reduction in Ca2+ currents in the motor nerve terminal. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png British Journal of Pharmacology Wiley

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

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Publisher
Wiley
Copyright
1994 British Pharmacological Society
ISSN
0007-1188
eISSN
1476-5381
D.O.I.
10.1111/j.1476-5381.1994.tb16998.x
Publisher site
See Article on Publisher Site

Abstract

1 The effects of the aminoglycoside antibiotics, streptomycin, neomycin and gentamicin were examined on perineural currents and evoked acetylcholine (ACh) release at frog motor nerve endings. 2 In the standard solutions used previously to measure Ca2+ currents, streptomycin reduced the peak amplitude of the Ca2+ component of the perineural current. 3 In a solution in which changes in both Ca2+ currents and evoked ACh release can be recorded simultaneously, both Ca2+ currents and evoked ACh release were reduced by aminoglycosides in the potency order neomycin > streptomycin > gentamicin. This potency sequence is similar to that reported previously for these agents as inhibitors of neurally‐evoked contractions of mammalian skeletal muscle. 4 These data suggest that the presynaptic inhibitory effects of aminoglycoside antibiotics at the neuromuscular junction occur as a consequence of a reduction in Ca2+ currents in the motor nerve terminal.

Journal

British Journal of PharmacologyWiley

Published: Oct 1, 1994

References

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