title: H1-histaminergic activation stimulates inositol-1-phosphate accumulation in chromaffin cells.
abstract: Adrenal medullary chromaffin cells maintained in vitro were prelabeled with [3H]inositol and the accumulation of [3H]inositol-1-phosphate, was determined following stimulation with a variety of pharmacological agents. Carbachol, bradykinin, and histamine produced significantly greater accumulation of [3H] inositol-1-phosphate over basal levels, with histamine producing the greatest effect. H1-histamine receptor antagonists, mepyramine, pyrilamine, tripelennamine and clemastine were all able to reduce or completely block the histamine response. The two specific H2-histamine receptor antagonists, cimetidine and ranitidine, had no effect on this response. Histamine dose-response characteristics in the presence of mepyramine and clemastine suggest the H1 antagonism to be competitive in nature.
mesh_terms: D000313:Adrenal Medulla / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D000818:Animals; D001920:Bradykinin / Q000494:pharmacology; D002217:Carbachol / Q000494:pharmacology; D002417:Cattle; D002927:Cimetidine / Q000494:pharmacology; D002974:Clemastine / Q000494:pharmacology; D006632:Histamine / Q000494:pharmacology; D006868:Hydrolysis; D066298:In Vitro Techniques; D007295:Inositol Phosphates / Q000378:metabolism*; D011738:Pyrilamine / Q000494:pharmacology; D011968:Receptors, Histamine / Q000187:drug effects*; D011969:Receptors, Histamine H1 / Q000187:drug effects*; D013403:Sugar Phosphates / Q000378:metabolism*; D013997:Time Factors
chemical_list: D007295:Inositol Phosphates; D011968:Receptors, Histamine; D011969:Receptors, Histamine H1; D013403:Sugar Phosphates; C002647:inositol 1-phosphate; D002927:Cimetidine; D006632:Histamine; D002217:Carbachol; D002974:Clemastine; D011738:Pyrilamine; D001920:Bradykinin