Cholinergic transmission regulates extrajunctional acetylcholine receptors

Alan Pestronk, Daniel B. Drachman, Elis F. Stanley, Donald L. Price, John W. Griffin

Research output: Contribution to journalArticle

Abstract

To determine the role of ACh transmission in the regulation of extrajunctional ACh receptors, we compared the effect of postsynaptic cholinergic blockade with that of surgical denervation. Blockade of ACh transmission was produced in the soleus muscles of rats by continuous local infusion of α-bungarotoxin, delivered by implantable osmotic pumps. Extrajunctional ACh receptors were measured by an 125I-α-BuTx binding method. Our results showed an increase of extrajunctional ACh receptors quantitatively equivalent to that resulting from surgical denervation. This denervation-like effect is attributed to elimination of (i) impulse-dependent ACh transmission (which normally triggers muscle usage), and (ii) spontaneous quantal and nonquantal ACh transmission. The influence of the nerve in regulating extrajunctional ACh receptors appears to be due to the sum of these forms of ACh transmission.

Original languageEnglish (US)
Pages (from-to)690-696
Number of pages7
JournalExperimental Neurology
Volume70
Issue number3
DOIs
StatePublished - Dec 1980

ASJC Scopus subject areas

  • Neurology
  • Developmental Neuroscience

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