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COMPARATIVE STUDY
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Clonidine inhibition of pancreatic secretion in rats: a possible central site of action.
European Journal of Pharmacology 1981 December 18
The effects of clonidine on pancreatic secretion were studied in rats fitted with chronic or acute fistulas. Subcutaneous and intracerebroventricular injections of clonidine in conscious rats induced a dose-dependent inhibition of basal pancreatic secretion involving volume, bicarbonate output and protein output with an ED50 of about 10 micrograms/kg. Clonidine inhibition of pancreatic secretion was not dependent on the associated inhibition of gastric acid output. In conscious rats, the pancreatic inhibitory effect of clonidine was completely antagonized by yohimbine and slightly by piperoxane and prazosin. Propranolol, mianserin, naloxone and cimetidine did not antagonize the clonidine effect. Clonidine decreased the basal pancreatic secretion in anaesthetized rats and this action was completely reversed by yohimbine. Clonidine inhibited the pancreatic secretion stimulated by 2-deoxyglucose. This effect was reversed by yohimbine, while prazosin had no effect. Clonidine did not inhibit the pancreatic secretion induced by electrical stimulation of the vagus nerves. These results suggest that clonidine inhibition of pancreatic secretion is mediated through alpha 2-adrenergic receptors, and at least in part by a central nervous system mechanism. Yohimbine alone increased basal pancreatic secretion in conscious rats. This suggests that alpha 2-adrenergic receptors might be involved in the physiological nerve tone to the pancreas.
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