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. 1977 Jan;264(2):489–509. doi: 10.1113/jphysiol.1977.sp011679

The effect of preganglionic nerve stimulation on the accumulation of certain analogues of choline by a sympathetic ganglion.

B Collier, D Ilson
PMCID: PMC1307773  PMID: 839464

Abstract

1. Cat superior cervical ganglia were perfused with a Krebs solution containing 10(-6) M [3H]homocholine (2-hydroxypropyl-trimethylammonium) or 10(-5) M [14C]triethylcholine (2-hydroxyethyl-triethylammonium). Preganglionic nerve stimulation (20 Hz) increased the accumulation of homocholine (3-2-fold) and of triethylcholine (2-1-fold). This increased accumulation during stimulation was not the result of increased metabolism. 2. The increased accumulation of homocholine or triethylcholine induced by pregnaglionic nerve stimulation was not reduced by tubocurarine or by atropine, but it was blocked by choline and by hemicholinium. These results suggested that preganglionic nerve stimulation increased choline analogue accumulation into cholinergic nerve terminals. 3. The increased accumulation of homocholine or of triethylcholine induced by preganglionic nerve stimulation was reduced when the Ca2+ concentration was reduced and was abolished in the absence of Ca2+. However, changes in the Mg2+ concentration which depressed acetylcholine (ACh) release by amounts comparable to those induced by altered Ca2+ concentrations did not alter the uptake of homocholine or triethylcholine. It is concluded that the uptake of choline analogues is not regulated by transmitter release but that stimulation increases the uptake of the choline analogues by a Ca2+-dependent mechanism. 4. The accumulation of ACh by ganglia perfused with a Krebs solution containing choline and high MgSO4 (18 mM) was measured. The ACh content of these ganglia did not increase, although choline transport presumably exceeded that necessary for ACh synthesis to replace released ACh. It is concluded that choline transport does not limit ACh synthesis in ganglia.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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