Effects of K+-depolarization, arachidonic acid, ethanol, and aging on the high-affinity choline transport in rat hippocampus.
The Na+-dependent high-affinity choline uptake (HACU) transport and the [3H]hemicholinium-3 ([3H]HC-3) specific binding were measured on hippocampal synaptosomes of young (3-6 months) and old (22 months) Wistar rats. In vitro effects of 100-300 microM arachidonic acid (AA) and of 5% ethanol were tested under basal as well as stimulated (55 mM KCl) conditions. The influence of AA (an irreversible decrease of HACU and a reversible increase of [3H]HC-3 binding) was more marked under stimulated rather than basal conditions in brain tissue of young rats. The increased K+-depolarization effect on HACU and the decreased influence of AA on [3H]HC-3 binding were estimated in brain tissue of old compared to young rats. Results suggest the involvement of different pools of the high-affinity choline carrier and marked changes due to aging in the regulation of the HACU transport.
Kristofiková
Z
Z
Prague Psychiatric Centre, Czech Republic.
Klaschka
J
J
Tejkalová
H
H
D000375:Aging / Q000378:metabolism*; D000818:Animals; D016718:Arachidonic Acid / Q000494:pharmacology*; D001692:Biological Transport; D002794:Choline / Q000378:metabolism*; D000431:Ethanol / Q000494:pharmacology*; D005260:Female; D006426:Hemicholinium 3 / Q000378:metabolism; D006624:Hippocampus / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D011188:Potassium / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar
D016718:Arachidonic Acid; D006426:Hemicholinium 3; D000431:Ethanol; D002794:Choline; D011188:Potassium