This study was designed to determine the possible protective effect of grape seed extract (GSE), a widely used antioxidant dietary supplement, on hepatic ischemia/reperfusion (I/R) injury. Wistar albino rats were subjected to 45 min of hepatic ischemia, followed by a 60 min reperfusion period. GSE was administered in a dose of 50 mg/kg/day orally for 15 days before I/R injury and repeated before the reperfusion period. Liver samples were taken for histological examination or determination of hepatic malondialdehyde (MDA), glutathione (GSH) and myeloperoxidase (MPO) activity. Serum aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels were determined to assess liver functions. Lactate dehydrogenase (LDH) and cytokines (TNF-α α α α α and IL-1β β β β β ) were also assayed in serum samples for the evaluation of generalized tissue damage. Ischemia/reperfusion caused a significant decrease in hepatic GSH, and significant increases in MDA level, and MPO activity. Serum AST and ALT levels, as well as LDH activity and plasma TNF-α α α α α and IL-1β β β β β levels were also elevated in the I/R group. Treatment with GSE reversed all these biochemical parameters as well as histological alterations induced by I/R. In conclusion, GSE reduced I/R-induced organ injury through its ability to balance the oxidant-antioxidant status, to inhibit neutrophil infiltration and to regulate the release of inflammatory mediators.
These results suggest that GSE protects the liver from oxidative damage following bile duct ligation in rats. This effect possibly involves the inhibition of neutrophil infiltration and lipid peroxidation; thus, restoration of oxidant and antioxidant status in the tissue.
Background and Aim: To evaluate the protective effect of alpha-lipoic acid in reducing oxidative damage after severe hepatic ischemia/reperfusion (IR) injury. Methods: Wistar albino rats were subjected to 45 min of hepatic ischemia, followed by 60 min reperfusion period. Lipoic acid (100 mg/kg i.p.) was administered 15 min prior to ischemia and immediately before reperfusion period. At the end of the reperfusion period aspartate aminotransferase (AST), alanine aminotransferase (ALT), lactate dehydrogenase (LDH) activity, and cytokine, TNF-α and IL-1β levels were determined in serum samples. Malondialdehyde (MDA), and glutathione (GSH) levels and myeloperoxidase (MPO) activity were determined in the liver tissue samples while formation of reactive oxygen species was monitored by using chemiluminescence (CL) technique with luminol and lucigenin probes. Tissues were also analyzed histologically. Results: Serum ALT, AST, and LDH activities and TNF-α and IL-1β levels were elevated in the I/R group, while this increase was significantly lower in the group of animals treated concomitantly with lipoic acid. Hepatic GSH levels, significantly depressed by I/R, were elevated back to control levels in lipoic acid-treated I/R group. Furthermore, increases in tissue luminol and lucigenin CL, MDA levels and MPO activity due to I/R injury were reduced back to control levels with lipoic acid treatment. Conclusion: Since lipoic acid administration alleviated the I/R-induced liver injury and improved the hepatic structure and function, it seems likely that lipoic acid with its antioxidant and oxidant-scavenging properties may be of potential therapeutic value in protecting the liver against oxidative injury due to ischemia-reperfusion.
INTRODUCTION Postoperative pain after laparoscopic cholecystectomy has three components: parietal, visceral and referred pain felt at the shoulder. Visceral peritoneal injury on the liver (Glisson's capsule) during cauterisation sometimes occurs as an unavoidable complication of the operation. Its effect on postoperative pain has not been quantified. In this study, we aimed to evaluate the association between Glisson's capsule injury and postoperative pain following laparoscopic cholecystectomy. METHODS The study was a prospective case-control of planned standard laparoscopic cholecystectomy with standardized anaesthesia protocol in patients with benign gallbladder disease. Visual analogue scale (VAS) abdominal pain scores were noted at 2 and 24 hours after the operation. One surgical team performed the operations. Operative videos were recorded and examined later by another team to detect presence of Glisson's capsule cauterisation. Eighty-one patients were enrolled into the study. After examination of the operative videos, 46 patients with visceral peritoneal injury were included in the study group, and the remaining 35 formed the control group. RESULTS VAS pain score at postoperative 2 and 24 hours was significantly higher in the study group than control (P = 0.027 and 0.017, respectively). CONCLUSIONS Glisson's capsule cauterisation in laparoscopic cholecystectomy is associated with increased postoperative pain. Additional efforts are recommended to prevent unintentional cauterisation.
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