title: Protective role of ellagitannins from Eucalyptus citriodora against ethanol-induced gastric ulcer in rats: impact on oxidative stress, inflammation and calcitonin-gene related peptide.
abstract: The gastroprotective activity of an ellagitannin-rich fraction obtained from Eucalyptus citriodora (ECF) was investigated against ethanol-induced gastric ulceration in rats. The rats were pretreated with ECF (25, 50 and 100mg/kg) 1h before the administration of absolute ethanol to induce acute gastric ulceration. The gastric lesions were significantly reduced by all doses of ECF. Notably, pre-treatment with ECF (100mg/kg) conferred 99.6% gastroprotection, which is significantly higher than that produced by omeprazole. Moreover, ECF administration markedly increased the mucin content in a dose-dependent manner. The potent gastroprotective effect of ECF could be partly mediated by attenuating ethanol-induced oxidative stress. ECF-pre-treatment markedly increased the depleted GSH and SOD levels in a dose-dependent manner. Moreover, ECF significantly decreased the elevated MDA tissue levels induced by ethanol administration. The results demonstrated that ECF administration exerted a powerful anti-inflammatory activity as evidenced by the reduction in the pro-inflammatory markers; IL-1β, TNF-α, 5-LO and COX-2. Additionally, the caspase-3 tissue levels were significantly reduced in the groups pre-treated with ECF. These results suggest that ECF could exert a beneficial gastroprotective effect through their antioxidant, anti-inflammatory and anti-apoptotic properties. Furthermore, ECF pre-treatment significantly attenuated the ethanol-induced decrease in CGRP expression, which has a protective role against gastric ulceration. Histopathological examination revealed intact mucosal layer, absence of hemorrhage and necrosis in groups treated with ECF. Ellagitannins were identified as the major active constituents responsible for the marked antioxidant and gastroprotective properties of ECF. The HPLC-PDA-ESI/MS/MS technique was employed to identify the ellagitannins of E. citriodora.
authors: Department of Pharmacognosy, Faculty of Pharmacy, Ain-Shams University, 11566 Cairo, Egypt. Electronic address: em_alsayed@pharma.asu.edu.eg.
authors: Eman
authors: E
authors: Al-Sayed
authors: Department of Pharmacology and Toxicology, Faculty of Pharmacy, Ain Shams University, 11566 Cairo, Egypt.
authors: Reem N
authors: RN
authors: El-Naga
mesh_terms: D000818:Animals; D015740:Calcitonin Gene-Related Peptide / Q000378:metabolism*; D053148:Caspase 3 / Q000378:metabolism; D000431:Ethanol / Q000009:adverse effects; D005052:Eucalyptus / Q000737:chemistry*; D047348:Hydrolyzable Tannins / Q000494:pharmacology*; D007249:Inflammation / Q000378:metabolism*; D008297:Male; D015394:Molecular Structure; D018384:Oxidative Stress / Q000187:drug effects*; D010936:Plant Extracts / Q000494:pharmacology; D018515:Plant Leaves / Q000737:chemistry; D020011:Protective Agents / Q000494:pharmacology; D051381:Rats; D013276:Stomach Ulcer / Q000139:chemically induced / Q000188:drug therapy*; D023382:Toxicity Tests, Acute
chemical_list: D047348:Hydrolyzable Tannins; D010936:Plant Extracts; D020011:Protective Agents; D000431:Ethanol; C505410:Casp3 protein, rat; D053148:Caspase 3; D015740:Calcitonin Gene-Related Peptide
keywords: Anti-inflammatory; Antioxidant; Caspase-3; Ellagitannins; Eucalyptus citriodora; Gastroprotection; HPLC-PDA-ESI/MS/MS