Linked Life Data

8886401

Source:http://linkedlifedata.com/resource/pubmed/id/8886401

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pubmed-article:8886401pubmed:abstractText1. The effects of benzodiazepine receptor antagonists on the inhibition of forskolin-stimulated adenylate cyclase (AC) activity by various benzodiazepine (BZ) and indoleamine agonists in the rat striatum were investigated. 2. A biphasic inhibition of forskolin-stimulated AC activity by the peripheral-type agonist, Ro5-4864, and a multiphasic inhibition by the non-selective BZ, diazepam, was observed. One phase of AC inhibition is consistent with a Gi-coupled receptor-mediated action, whereas the other phases appear to involve a direct effect on the enzyme itself. 3. While the central-type antagonist, flumazenil, had no effect on the ability of Ro5-4864 to inhibit AC activity, the peripheral-type receptor ligand, PK 11195, abolished the first phase of inhibition. 4. PK 11195 and pertussis toxin were found to block the inhibitory effect of various BZs and the indoleamines, melatonin and 2-iodomelatonin, on induced AC activity. 5. Saturation binding studies, conducted at 30 degrees C with [3H]-diazepam revealed a single binding site in the rat striatum (KD = 19.3 +/- 0.80 nM) which significantly decreased in affinity in the presence of GTP (KD = 30.5 +/- 2.6 nM; P < 0.05). No significant change in Bmax was observed. 6. These findings indicate the presence of Gi-coupled BZ receptors in the rat striatum. Thus, suppression of cyclic AMP production may contribute to the diverse neuropharmacological effects of BZs, melatonin and related drugs.lld:pubmed
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pubmed-article:8886401pubmed:articleTitlePK 11195 blockade of benzodiazepine-induced inhibition of forskolin-stimulated adenylate cyclase activity in the striatum.lld:pubmed
pubmed-article:8886401pubmed:affiliationDepartment of Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada.lld:pubmed
pubmed-article:8886401pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8886401pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed