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pubmed:abstractText |
1. Inositol phospholipid hydrolysis was examined in human cerebral cortex slices by a [3H]-inositol prelabelling assay. 2. Enhancement of [3H]-inositol phosphates accumulation was observed in the presence of carbachol, noradrenaline, histamine, 5-hydroxytryptamine (5-HT) and depolarizing concentrations of KCl. 3. Despite having no effect alone, adenosine (and its analogue 2-chloroadenosine) selectively inhibited the direct response to histamine. 4. The inhibition due to adenosine was antagonized by theophylline, but not by 8-cyclopropyltheophylline.
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