Putative effect of Helicobacter pylori and gastritis on gastric acid secretion in cat.

Helicobacter pylori may increase or inhibit gastric acid. We studied acid variations and plasma gastrin in cats harboring Helicobacter felis, harboring H. pylori, or free of gastric pathogens with reference to thioperamide (H(3) receptor antagonist) and SR-27417A (PAF receptor antagonist).

Expression and regulation of leptin receptor proteins in afferent and efferent neurons of the vagus nerve.

Leptin, the product of the ob gene, plays a key role in the regulation of food intake via a cross-talk between hypothalamic leptin receptors and neuropeptides that affect feeding behaviour. Recent studies have shown a synergistic interaction between leptin and cholecystokinin (CCK) leading to suppression of food intake, which involves CCK-1 receptors and capsaicin-sensitive vagal fibres. In this study, we have investigated the presence of leptin receptors in afferent and efferent neurons of the vagus nerve.

The H3 receptor is involved in cholecystokinin inhibition of food intake in rats.

We investigated the peripheral effects of an H3-receptor agonist and an H3-receptor antagonist (R)alpha-methylhistamine (Ralpha-MeHA) and thioperamide, respectively, on basal feeding and the CCK8-induced inhibition of food intake in rat. Intraperitoneal injection of thioperamide reduced food intake in a dose-dependent manner with maximal inhibition (35%, P<0.01 vs saline) at 3 mg/kg.

Human apolipoprotein A-IV reduces gastric acid secretion and diminishes ulcer formation in transgenic mice.

We have investigated the involvement of human apolipoprotein A-IV (apoA-IV) in gastric acid secretion and ulcer formation in recently generated apoA-IV transgenic mice. Compared to control littermates, transgenic animals showed a gastric acid secretion decreased by 43-77% whereas only slight variations were observed in the different cell population densities within the gastric mucosa. In addition, no variation in gastrin levels was observed.

Physiological role of cholecystokinin B/gastrin receptor in leptin secretion.

In the present study, we investigated whether cholecystokinin (CCK) or its structurally related peptide gastrin participates in long term regulation of adipocyte leptin secretion. The levels of circulating leptin observed after 2 and 6 h of refeeding in 18-h fast rats were significantly lowered by injection of the specific gastrin/CCK-B receptor antagonist YM022 at doses that did not affect feeding behavior. Moreover, in normally fed animals, circulating leptin was markedly decreased by chronic injection of YM022 (from 4 +/- 0.