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Related Experiment Videos

Decrease in acetylcholine-induced current by neomycin in PC12 cells.

Li-jun Shi1, Ling-ai Liu, Xiao-hong Cheng

  • 1Department of Physiology, Beijing Medical College of PLA, Beijing 100071, China. l.j.shi@263.net

Archives of Biochemistry and Biophysics
|June 14, 2002
PubMed
Summary
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Neomycin, an aminoglycoside antibiotic, inhibits acetylcholine-induced currents in pheochromocytoma cells. This noncompetitive inhibition occurs without phospholipase C involvement, affecting catecholamine release.

Area of Science:

  • Pharmacology
  • Neuroscience
  • Cell Biology

Background:

  • Aminoglycoside antibiotics like neomycin can have diverse cellular effects.
  • Neuronal nicotinic receptors mediate fast synaptic transmission and are crucial for catecholamine release.

Purpose of the Study:

  • To investigate the specific effects of neomycin on acetylcholine-induced currents (I(ACh)) in pheochromocytoma cells.
  • To elucidate the mechanism underlying neomycin's action on neuronal nicotinic receptors.

Main Methods:

  • Whole-cell clamp technique was employed to measure I(ACh) in pheochromocytoma cells.
  • Dose-response relationships and effects of protein kinase C modulators were analyzed.

Main Results:

  • Neomycin rapidly and reversibly inhibited I(ACh) in a concentration-dependent manner.

Related Experiment Videos

  • Neomycin acted as a noncompetitive inhibitor, reducing peak current amplitude by approximately 33% without altering the dissociation constant.
  • Inhibition of I(ACh) by neomycin was independent of protein kinase C activation or phospholipase C involvement.

    • Conclusions:

    • Neomycin directly inhibits neuronal nicotinic receptor-coupled channels, likely by binding to a specific site.
    • This inhibition modulates catecholamine release from sympathetic cells.
    • The findings highlight a novel mechanism of action for neomycin beyond its antimicrobial properties.