title: Calcium-dependent [3H]acetylcholine release and muscarinic autoreceptors in rat cortical synaptosomes during development.
abstract: A number of presynaptic cholinergic parameters (high affinity [3H]choline uptake, [3H]acetylcholine synthesis, [3H]acetylcholine release, and autoinhibition of [3H]acetylcholine release mediated by muscarinic autoreceptors) were comparatively analyzed in rat brain cortex synaptosomes during postnatal development. These various functions showed a differential time course during development. At 10 days of age the release of [3H]acetylcholine evoked by 15 mM KCl from superfused synaptosomes was Ca2+-dependent but insensitive to the inhibitory action of extrasynaptosomal acetylcholine. The muscarinic autoreceptors regulating acetylcholine release were clearly detectable only at 14 days, indicating that their appearance may represent a criterion of synaptic maturation more valuable than the onset of a Ca2+-dependent release.
mesh_terms: D000109:Acetylcholine / Q000378:metabolism*; D000375:Aging; D000818:Animals; D002118:Calcium / Q000494:pharmacology*; D002540:Cerebral Cortex / Q000254:growth & development* / Q000378:metabolism; D002794:Choline / Q000378:metabolism; D007700:Kinetics; D051381:Rats; D011919:Rats, Inbred Strains; D011950:Receptors, Cholinergic / Q000378:metabolism*; D011976:Receptors, Muscarinic / Q000378:metabolism*; D013574:Synaptosomes / Q000187:drug effects / Q000378:metabolism*; D014316:Tritium
chemical_list: D011950:Receptors, Cholinergic; D011976:Receptors, Muscarinic; D014316:Tritium; D002794:Choline; D000109:Acetylcholine; D002118:Calcium