Accession Number : AD0787025
Title : Acetylcholine Synthesis from Recaptured Choline by a Sympathetic Ganglion,
Corporate Author : MCGILL UNIV MONTREAL (QUEBEC) DEPT OF PHARMACOLOGY AND THERAPEUTICS
Personal Author(s) : Collier,B. ; Katz,H. S.
Report Date : 19 NOV 1973
Pagination or Media Count : 17
Abstract : Although choline produced by ACh hydrolysis can be re-used for ACh synthesis, it is clear from experiments that exogenous choline can compete with endogenously produced choline for use in ACh synthesis, and this is consistent with the technique used to label the ganglion's ACh store. The present experiments suggest that ganglia, stimulated at 5 Hz and perfused with a physiological concentration of choline, recapture about 50-60% of the choline made available from ACh hydrolysis. Thus endogenously produced choline is at least as important as is circulating choline for maintaining ACh synthesis. The release of ACh/impulse at 20 Hz is the same as at 5 Hz and therefore the concentration of choline from hydrolysed ACh should be the same at either frequency. The present experiments also demonstrated that choline recapture is more efficient when exogenous choline is absent than when exogenous choline is present.
Descriptors : *Acetylcholine, *Cholines, Hydrolysis, Biosynthesis, Ganglia, Nervous system, Canada
Subject Categories : Anatomy and Physiology
Distribution Statement : APPROVED FOR PUBLIC RELEASE