AIM: To determine the effect of melatonin pre- and post-treatment on the severity of L-arginine (L-Arg) -induced experimental pancreatitis in rats. METHODS: Male Wistar rats (25) were divided into five groups. Those in group A received two injections of 3.2g/kg body weight L-Arg i.p. at an interval of 1h. In group MA, the rats were treated with 50 mg/kg body weight melatonin i.p. 30 min prior to L-Arg administration. In group AM, the rats received the same dose of melatonin 1h after L-Arg was given. In group M, a single dose of melatonin was administered as described previously. In group C the control animals received physiological saline injections i.p. All rats were exsanguinated 24 h after the second L-Arg injection. RESULTS: L-Arg administration caused severe necrotizing pancreatitis confirmed by the significant elevations in the serum amylase level, the pancreatic weight/body weight ratio (pw/bw), the pancreatic IL-6 content and the myeloperoxidase activity, relative to the control values. Elevation of the serum amylase level was significantly reduced in rats given melatonin following L-Arg compared to rats injected with L-Arg only. The activities of the pancreatic antioxidant enzymes (Cu/Zn-superoxide dismutase (Cu/Zn-SOD) and catalase (CAT)) were significantly increased 24 h after pancreatitis induction. Melatonin given in advance of L-Arg significantly reduced the pancreatic CAT activity relative to that in the rats treated with L-Arg alone. In the liver, L-Arg significantly increased the lipid peroxidation level, and the glutathione peroxidase and Cu/Zn-SOD activities, whereas the Mn-SOD activity was reduced as compared to the control rats. Melatonin pre-treatment prevented these changes. CONCLUSION: Melatonin is an antioxidant that is able to counteract some of the L-Arg-induced changes during acute pancreatitis, and may therefore be helpful in the supportive therapy of patients with acute necrotizing pancreatitis.
AIM: To determine the effect of melatonin pre- and post-treatment on the severity of L-arginine (L-Arg) -induced experimental pancreatitis in rats. METHODS: Male Wistar rats (25) were divided into five groups. Those in group A received two injections of 3.2g/kg body weight L-Arg i.p. at an interval of 1h. In group MA, the rats were treated with 50 mg/kg body weight melatonin i.p. 30 min prior to L-Arg administration. In group AM, the rats received the same dose of melatonin 1h after L-Arg was given. In group M, a single dose of melatonin was administered as described previously. In group C the control animals received physiological saline injections i.p. All rats were exsanguinated 24 h after the second L-Arg injection. RESULTS:L-Arg administration caused severe necrotizing pancreatitis confirmed by the significant elevations in the serum amylase level, the pancreatic weight/body weight ratio (pw/bw), the pancreaticIL-6 content and the myeloperoxidase activity, relative to the control values. Elevation of the serum amylase level was significantly reduced in rats given melatonin following L-Arg compared to rats injected with L-Arg only. The activities of the pancreatic antioxidant enzymes (Cu/Zn-superoxide dismutase (Cu/Zn-SOD) and catalase (CAT)) were significantly increased 24 h after pancreatitis induction. Melatonin given in advance of L-Arg significantly reduced the pancreatic CAT activity relative to that in the rats treated with L-Arg alone. In the liver, L-Arg significantly increased the lipid peroxidation level, and the glutathione peroxidase and Cu/Zn-SOD activities, whereas the Mn-SOD activity was reduced as compared to the control rats. Melatonin pre-treatment prevented these changes. CONCLUSION:Melatonin is an antioxidant that is able to counteract some of the L-Arg-induced changes during acute pancreatitis, and may therefore be helpful in the supportive therapy of patients with acute necrotizing pancreatitis.
Authors: D X Tan; L C Manchester; R J Reiter; W B Qi; M Zhang; S T Weintraub; J Cabrera; R M Sainz; J C Mayo Journal: Biochim Biophys Acta Date: 1999-10-18
Authors: T Brzozowski; P C Konturek; S J Konturek; R Pajdo; W Bielanski; I Brzozowska; J Stachura; E G Hahn Journal: J Pineal Res Date: 1997-09 Impact factor: 13.007
Authors: Akan Yenicerioglu; Ziya Cetinkaya; Mustafa Girgin; Bilal Ustundag; Ibrahim H Ozercan; Refik Ayten; Burhan H Kanat Journal: Can J Surg Date: 2013-06 Impact factor: 2.089
Authors: Balázs Kui; Zsolt Balla; Eszter T Végh; Petra Pallagi; Viktória Venglovecz; Béla Iványi; Tamás Takács; Péter Hegyi; Zoltán Rakonczay Journal: Lab Invest Date: 2013-12-23 Impact factor: 5.662
Authors: Jolanta Jaworek; Joanna Szklarczyk; Andrzej K Jaworek; Katarzyna Nawrot-Porąbka; Anna Leja-Szpak; Joanna Bonior; Michalina Kot Journal: Int J Inflam Date: 2012-04-23
Authors: Jolanta Jaworek; Anna Leja-Szpak; Katarzyna Nawrot-Porąbka; Joanna Szklarczyk; Michalina Kot; Piotr Pierzchalski; Marta Góralska; Piotr Ceranowicz; Zygmunt Warzecha; Artur Dembinski; Joanna Bonior Journal: Int J Mol Sci Date: 2017-05-08 Impact factor: 5.923