Abstract
The effects of intracisternal and intravenous injections of the somatostatin analog, SMS 201-995, on gastric acid secretion were investigated in rats with pylorus ligation or gastric cannula. Intracisternal injection of SMS 201-995 induced a dose-related (0.1-0.3 μg) and long-lasting stimulation of gastric acid output with a peak response at 3 h postinjection in conscious, pylorus-ligated rats. Intracisternal SMS 201-995 increased histamine levels in the portal blood, whereas plasma gastrin levels were not modified. Atropine, cimetidine and adrenalectomy abolished the stimulatory effect of intracisternal SMS 201-995 (0.3 μg). SMS 201-995 (0.03 μg), microinjected unilaterally into the dorsal vagal complex, increased gastric acid output in urethane anesthetized rats. SMS 201-995, injected intravenously at 0.5 μg, did not alter gastric secretion, whereas higher doses (5-20 μg) resulted in a dose-related inhibition of gastric acid secretion in conscious pylorus-ligated rats. These data indicate that SMS 201-995, a selective ligand for somatostatin-1 receptor subtype, induces a centrally mediated stimulatory effect on gastric acid secretion in rats. The central action involves the parasympathetic system, muscarinic and H2 receptors as well as adrenal-dependent pathways.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 401-406 |
| Number of pages | 6 |
| Journal | Peptides |
| Volume | 12 |
| Issue number | 3 |
| DOIs | |
| State | Published - 1991 |
Keywords
- Adrenal
- Atropine
- Cimetidine
- DVC
- Histamine
ASJC Scopus subject areas
- Biochemistry
- Endocrinology
- Physiology
- Cellular and Molecular Neuroscience