Dietary choline augments blood choline and cholinergic transmission in terrestrial mollusk Limax maximus

Publisher Website
Google Scholar
Abstract
A radioenzymatic assay was used to determine the concentration of choline in the hemolymph of the terrestrial mollusk L. maximus maintained on choline-enriched and choline-deficient diets. The levels of free choline in the slug''s hemolymph varied with the availability of choline in the diet. The concentration of choline in the plasma of choline-enriched animals averaged 5.5 .mu.M while the mean circulating choline level of choline-deprived slugs was 3.3 .mu.M. The difference in choline levels between the 2 groups was statistically significant. Neurophysiological measurements of transmission at the isolated cholinergic synapses between the salivary burster neuron (SD) and the salivary duct muscle (SD) showed that this synapse was sensitive to fluctuations in the external choline concentration within the physiological range. Increases in exogeneous choline from 0.5-2.0 .mu.M, from 2.5-5.0 .mu.M and from 5.0-15.0 .mu.M were followed by increases in the amplitudes of SB-elicited junction potentials recorded from the SD by a focal extracellular electrode. The SB-SD synapse is sensitive to the fluctuations in exogenous choline that can occur with a change in diet.

This publication has 2 references indexed in Scilit: