Title : HCl-stimulated duodenal HCO3- secretion in conscious rat. Interactions among VIP, nicotinic receptor mechanisms, and prostaglandins.

Pub. Date : 1994 Oct

PMID : 7924732






4 Functional Relationships(s)
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1 Using an isolated loop of the proximal duodenum of conscious rats, the role of vasoactive intestinal peptide (VIP) in the duodenal HCO3- response to HCl was examined, especially interactions with participating cholinoceptor mechanisms and prostaglandins. Bicarbonates vasoactive intestinal peptide Rattus norvegicus
2 The HCO3- secretion in response to graded doses of intravenous VIP (0.00625-6 nmol/kg/30 min) was dose-dependent to maximally 33.5 +/- 10.5 mumol/cm/hr. Bicarbonates vasoactive intestinal peptide Rattus norvegicus
3 The HCO3- secretion during a single intravenous infusion of VIP (12 nmol/kg/hr), 13.9 +/- 4.2 mumol/cm/hr, was unchanged by atropine, reduced to 10.0 +/- 3.5 mumol/cm/hr by hexamethonium, and augmented to 18.9 +/- 4.7 mumol/cm/hr by indomethacin. Bicarbonates vasoactive intestinal peptide Rattus norvegicus
4 In conclusion, in the duodenal HCO3- response to luminal HCl, VIP may have a stimulatory role, which partially depends on nicotinic, but not on muscarinic cholinoceptor mechanisms, and which is negatively modulated by prostaglandins. Bicarbonates vasoactive intestinal peptide Rattus norvegicus