title: Selective alteration of neurotransmitter release by low oxygen in vitro.
abstract: The potassium-stimulated release of acetylcholine, norepinephrine, serotonin, glutamate, and 4-aminobutyrate from superfused rat cortical slices was studied during hypoxia. A reduction in oxygen tensions from 603 +/- 6 to 22 +/- 2 mm Hg selectively altered the calcium-dependent efflux of these neurotransmitters, but did not change their calcium-independent release. The calcium-dependent release of [14C]acetylcholine decreased (39%), while that of glutamate increased (66%) and 4-aminobutyrate, [3H]norepinephrine, and [3H]serotonin were unaffected. Thus, low oxygen reveals variations in the calcium-dependent release mechanisms of several neurotransmitters. These differences may have important implications for pharmacological intervention of neurotransmitter release.
mesh_terms: D000109:Acetylcholine / Q000378:metabolism; D000818:Animals; D002118:Calcium / Q000494:pharmacology; D002540:Cerebral Cortex / Q000378:metabolism*; D005971:Glutamates / Q000378:metabolism; D018698:Glutamic Acid; D000860:Hypoxia / Q000378:metabolism*; D066298:In Vitro Techniques; D008297:Male; D018377:Neurotransmitter Agents / Q000378:metabolism*; D009638:Norepinephrine / Q000378:metabolism; D011188:Potassium / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D012701:Serotonin / Q000378:metabolism; D005680:gamma-Aminobutyric Acid / Q000378:metabolism
chemical_list: D005971:Glutamates; D018377:Neurotransmitter Agents; D012701:Serotonin; D018698:Glutamic Acid; D005680:gamma-Aminobutyric Acid; D000109:Acetylcholine; D011188:Potassium; D002118:Calcium; D009638:Norepinephrine