Aim: To investigate the mechanism of resveratrol underlying the microcirculation disorder and lung injury following severe acute pancreatitis (SAP).
Methods: Twenty-four rats were divided into 3 groups (SAP, sham and resveratrol groups) randomly. SAP model was established by injecting 4% sodium taurocholate 1 mL/kg through puncturing pancreatic ducts. Sham (control) group (8 rats) was established by turning over the duodenum. Resveratrol was given at 0.1 mg/kg b.m. intraperitoneally. Rats were sacrificed 9 h after SAP was induced. Blood samples were obtained for hemorrheological examination. Lung tissues were used for pathological observation, and examination of microvascular permeability, dry/wet ratio and myeloperoxidase (MPO) activity. Gene expression of intercellular adhesion molecule-1 (ICAM-1) was detected by RT-PCR.
Results: Compared with SAP group, resveratrol relieved the edema and infiltration of leukocytes in the lungs. Resveratrol improved markers of hemorrheology: high VTB (5.77+/-1.18 mPas vs 9.49+/-1.34 mPas), low VTB (16.12+/-3.20 mPas vs 30.91+/-7.28 mPas), PV (4.69+/-1.68 mPas vs 8.00+/-1.34 mPas), BSR (1.25+/-0.42 mm/h vs 0.03+/-0.03 mm/h), VPC (54.67+/-3.08% vs 62.17+/-3.39%), fibrinogen (203.2+/-87.8 g/ L vs 51.3+/-19.1 g/L), original hemolysis (0.45+/-0.02 vs 0.49+/-0.02), and complete hemolysis (0.41+/-0.02 vs 0.43+/-0.02) (P<0.05). Resveratrol decreased the OD ratio of ICAM-1 gene (0.800+/-0.03 vs 1.188+/-0.10), dry/wet ratio (0.74+/-0.02 vs 0.77+/-0.03), microvascular permeability (0.079+/-0.006 vs 0.112+/-0.004) and MPO activity (4.42+/-0.32 vs 5.03+/-0.51) significantly (P<0.05).
Conclusion: Resveratrol can improve the microcirculation disorder of the lung by decreasing leukocyte-endothelial interaction, reducing blood viscosity, improving the decrease of blood flow, and stabilizing erythrocytes in SAP rats. It may be a potential candidate to treat SAP and its severe complications (ALI).