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Chen, Z
Acta pharmacologica Sinica, 04/2001, Volume: 22, Issue: 4Journal Article
The effect of clobenpropit on regional cerebral blood flow (rCBF) was investigated in the rat hippocampus. rCBF was determined in the hippocampus by the hydrogen clearance method. The blood pressure was measured by a tail-cuff plethysmograph. Intracerebroventricular (icv) injection of clobenpropit (20, 50 microg), a representative H3-antagonist, dose-dependently and significantly increased rCBF in the hippocampus. The increase of rCBF induced by clobenpropit was enhanced by metoprine (1, 2 mg/kg), a selective histamine N-methyltransferase inhibitor; however, was antagonized by an H3-agonist, (R)-alpha-methylhistamine (5 microg), an H(1)-antagonist, mepyramine (5-10 mg/kg), and an H2-antagonist, zolantidine (10 mg/kg). Clobenpropit caused no apparent effects on blood pressure even at a high dose of 50 microg. These results suggest that brain endogenous histamine may contribute to increase rCBF in the rat hippocampus via both the post-synaptic H1-, H2-receptors and the pre-synaptic H3-receptor.
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