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  • Title: Sensitivity of histamine H3 receptor agonist-stimulated [35S]GTP gamma[S] binding to pertussis toxin.
    Author: Clark EA, Hill SJ.
    Journal: Eur J Pharmacol; 1996 Jan 25; 296(2):223-5. PubMed ID: 8838460.
    Abstract:
    The effect of histamine H3 receptor-selective ligands on [35S]guanosine 5'-o-(gamma-thio)triphosphate ([35S]GTP gamma[S]) binding has been examined in rat cerebral cortical membranes. R alpha-Methylhistamine and N alpha-methylhistamine produced a concentration-dependent stimulation of [35S]GTP gamma[S] binding which was attenuated in the presence of the selective histamine H3 receptor antagonist thioperamide. In addition, treatment of brain membranes with pertussis toxin abolished the histamine H3 receptor agonist stimulated binding of [35S]GTP gamma[S]. These results provide the first evidence that histamine H3 receptors couple directly to a Gi/Go protein in mammalian brain.
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