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Gastroprotections of escins Ia, Ib, IIa, and IIb on ethanol-induced gastric mucosal lesions in rats

Authors
Journal
European Journal of Pharmacology
0014-2999
Publisher
Elsevier
Publication Date
Volume
373
Issue
1
Identifiers
DOI: 10.1016/s0014-2999(99)00249-6
Keywords
  • Escin
  • Ethanol-Induced Gastric Lesion
  • Capsaicin-Sensitive Afferent Neuron
  • Nitric Oxide (No)
  • Prostaglandin
  • Sympathetic Nervous System
  • Gastroprotection

Abstract

Abstract Effects of escins Ia, Ib, IIa, and IIb isolated from horse chestnuts on ethanol-induced gastric mucosal lesions and the roles of capsaicin-sensitive afferent neurons, endogenous nitric oxide (NO), sulfhydryls, prostaglandins, as well as gastric secretion and the sympathetic nervous system, were investigated in rats. Test samples were given orally to fasted rats 1 h before ethanol (1.5 ml/rat, p.o.) treatment or ligation of the pylorus. Escins Ia–IIb (10–50 mg/kg) potently inhibited ethanol-induced gastric mucosal lesions, whereas desacylescins I and II (50 mg/kg) showed no such effect. These active saponins (10 and 20 mg/kg) did not decrease the gastric secretion. The gastroprotections of escins Ia–IIb were attenuated by the pretreatment with capsaicin, N G-nitro- l-arginine methyl ester, and indomethacin, but not by N-ethylmaleimide. The effects of escins Ia–IIb were also attenuated in streptozotocin-induced diabetic rats, in which the activity of the sympathetic nervous system was abnormal. These results suggest that the gastroprotections of escins Ia–IIb on ethanol-induced gastric mucosal lesions are acid-independent, whereas endogenous prostaglandins, NO, capsaicin-sensitive afferent neurons, and the sympathetic nervous system participate.

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