title: Accumulations of inositol phosphates and cyclic AMP in brain slices: synergistic interactions of histamine and 2-chloroadenosine.
abstract: 2-Chloroadenosine, 5'-N-ethylcarboxamidoadenosine, N6-cyclohexyladenosine and other adenosine analogs enhance histamine-elicited, but not norepinephrine- or carbamylcholine-elicited accumulations of inositol phosphates in [3H]inositol-labeled guinea-pig cerebral cortical slices. The adenosine analogs alone have no effect on accumulations of inositol phosphates. The effect of 2-chloroadenosine is blocked by the adenosine receptor antagonists theophylline and 1,3-dialkyl-8-p-sulfophenylxanthines. The rank order of activity of the six adenosine analogs with respect to augmentation of histamine-elicited accumulation of inositol phosphates in guinea-pig cerebral cortical slices is different from the rank order at an A2-adenosine receptor that mediates synergistic accumulations of cyclic AMP by adenosine analogs and histamine in guinea-pig cerebral cortical slices.
mesh_terms: D015762:2-Chloroadenosine; D000241:Adenosine / Q000031:analogs & derivatives* / Q000494:pharmacology; D000818:Animals; D002217:Carbachol / Q000494:pharmacology; D002540:Cerebral Cortex / Q000187:drug effects / Q000378:metabolism*; D000242:Cyclic AMP / Q000378:metabolism*; D006168:Guinea Pigs; D006632:Histamine / Q000494:pharmacology*; D066298:In Vitro Techniques; D007295:Inositol Phosphates / Q000378:metabolism*; D008297:Male; D009638:Norepinephrine / Q000494:pharmacology; D011956:Receptors, Cell Surface / Q000187:drug effects / Q000378:metabolism*; D011983:Receptors, Purinergic; D013403:Sugar Phosphates / Q000378:metabolism*; D013806:Theophylline / Q000494:pharmacology
chemical_list: D007295:Inositol Phosphates; D011956:Receptors, Cell Surface; D011983:Receptors, Purinergic; D013403:Sugar Phosphates; D015762:2-Chloroadenosine; D006632:Histamine; D002217:Carbachol; D013806:Theophylline; D000242:Cyclic AMP; D000241:Adenosine; D009638:Norepinephrine