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pmid10797867      Acta+Physiol+Pharmacol+Ther+Latinoam 1999 ; 49 (4): 242-50
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  • Sites and mechanisms of antibiotic-induced neuromuscular block: a pharmacological analysis using quantal content, voltage clamped end-plate currents and single channel analysis #MMPMID10797867
  • Fiekers JF
  • Acta Physiol Pharmacol Ther Latinoam 1999[]; 49 (4): 242-50 PMID10797867show ga
  • Since the original observation of Vital Brazil and Corrado (1957) concerning the antibiotic induced neuromuscular block produced by streptomycin, there has been considerable interest in the mechanisms responsible for not only neuromuscular block but also the effects of antibiotics on different systems. We used the voltage clamped end-plate of transacted skeletal muscle to examine the concentration-dependent actions of several groups of antibiotics. The aminoglycoside antibiotics, neomycin and streptomycin, were both more effective at reducing quantal release of acetylcholine (ACh) than interacting with the postjunctional ACh receptor-channel complex. Neomycin was approximately 10 X more potent prejunctionally than streptomycin and the prejunctional effects of each antibiotic were reversed competitively by raising extracellular calcium. Both neomycin and streptomycin also had postjunctional actions at higher concentrations. Neomycin interacted with the open state of the ACh receptor ion channel complex while streptomycin blocks the ACh receptor. The lincosamide antibiotics, lincomycin and clindamycin produced their neuromuscular block postjunctionally by interacting with the open state of the ACh-receptor channel complex. Clindamycin is approximately 20 X more effective at blocking the open channel than was lincomycin. Using cell attached patch clamp recordings in cultured rat myotubes, we demonstrated a lincosamide-induced block of open ion channels with clindamycin having a much slower unblocking rate than lincomycin. Using epimers of the lincosamides, we demonstrated that lipophilicity of the molecule, rather than stereochemical considerations, is important for open channel blockade affecting primarily the "off" rate of channel blocking. This mechanism appears important for not only the lincosamide antibiotics but also for the postjunctional actions of the aminoglycoside antibiotics, particularly neomycin.
  • |*Macrolides[MESH]
  • |*Neuromuscular Blockade[MESH]
  • |Animals[MESH]
  • |Anti-Bacterial Agents/*pharmacology[MESH]
  • |Calcium Channels/*drug effects/metabolism[MESH]
  • |Calcium/analysis[MESH]
  • |Clindamycin/pharmacology[MESH]
  • |Dose-Response Relationship, Drug[MESH]
  • |Lincomycin/pharmacology[MESH]
  • |Lincosamides[MESH]
  • |Muscle, Skeletal/drug effects[MESH]
  • |Neomycin/pharmacology[MESH]
  • |Neuromuscular Blocking Agents/*pharmacology[MESH]
  • |Patch-Clamp Techniques[MESH]
  • |Rats[MESH]
  • |Receptors, Cholinergic/drug effects/metabolism[MESH]


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