n-3, n-6, and n-9 polyunsaturated fatty acids--which composition in parenteral nutrition decreases severity of acute hemorrhagic necrotizing pancreatitis in rats?
Acute pancreatitis often requires parenteral nutrition. Thus, we analyzed, using a randomized trial, whether different fatty acids in parenteral nutrition influence lipidperoxidation and histopathology in acute pancreatitis in rats. Seventy-five male Sprague-Dawley rats were randomized into five groups (gr.) (n=15). Gr. 1 underwent a laparotomy followed by saline infusion, gr. 2-5 received intraductal glycodeoxycholic acid (GDOC) followed by intravenous cerulein. Six hours after induction of pancreatitis (IOP), gr. 2 received saline infusion, while gr. 3 was infused with standard lipovenous (rich in [n-6] polyunsaturated fatty acids (PUFA)), gr. 4 received ClinOleic (rich in [n-9] PUFA), while gr. 5 was infused with Omegaven (rich in [n-3] PUFA) for 18 h. After 24 h, all animals were sacrificed and the pancreas was determined histopathologically according to the severity of pancreatitis. Furthermore, pancreatic lipidperoxidation (TBARS) and activity of lipid production protective enzymes superoxide dismutase (SOD) and gluthationperoxidase (GSHPx) were analyzed. Omegaven infusion reduced the severity of histopathologic changes in acute pancreatitis and decreased lipidperoxidation (TBARS) in pancreatic tissue samples. Furthermore, pancreatic activity of SOD was increased. However, standard PUFA and ClinOleic infusion did not influence the severity of pancreatitis and lipidperoxidation. Parenteral nutrition high in n-3 PUFA seems to be superior to compositions of n-6 or n-9 PUFA in the treatment of acute hemorrhagic pancreatitis in rats.