title: Corticosterone prevents the increase in noradrenaline-stimulated adenyl cyclase activity in rat hippocampus following adrenalectomy or metopirone.
abstract: Corticosterone modulation of the noradrenaline-responsive cyclic AMP generating system was examined in rat hippocampus. Adrenalectomy was found to produce a small but significant elevation in the rate of cyclic AMP formation in response to noradrenaline. Implantation of corticosterone pellets 5 days prior to sacrifice prevented this adrenalectomy-induced increase. Metopirone, an inhibitor of corticosterone synthesis, was also observed to increase cyclic AMP formation. This elevation was seen 2 h following a 50 mg/kg i.p. injection and was completely prevented by corticosterone pellet implantation. Metopirone had no significant effect on cyclic AMP production after 1 h, while a slight but statistically non-significant elevation remained at 4 h. These observations parallel the inhibitory effect of Metopirone on corticosterone synthesis as determined by serum corticosterone levels.
mesh_terms: D000262:Adenylyl Cyclases / Q000378:metabolism*; D000315:Adrenalectomy; D000818:Animals; D003345:Corticosterone / Q000097:blood / Q000494:pharmacology*; D006624:Hippocampus / Q000187:drug effects / Q000201:enzymology*; D008297:Male; D008797:Metyrapone / Q000494:pharmacology*; D009638:Norepinephrine / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D013997:Time Factors
chemical_list: D000262:Adenylyl Cyclases; D003345:Corticosterone; D009638:Norepinephrine; D008797:Metyrapone