Ulinastatin Reduces T Cell Apoptosis in Rats with SevereAcute PancreatitisChunli Wang, Tao Ma, Xiaolei Zhou, Nan Li and Shengyi You*Department of General Surgery, General Hospital of Tianjin Medical University, Tianjin 300052, China*For correspondence: Email: shengyiyou@139.comReceived: 20 October 2013 Revised accepted: 12 December 2013AbstractPurpose: To investigate the immunoregulative effects of ulinastatin (UTI) on T lymphocytes apoptosisin rats with severe acute pancreatitis (SAP) and to elucidate its underlying molecular mechanism.Methods: Thirty six Wistar rats were randomly divided into 3 groups (n =12): sham, SAP model andUTI-treated group. SAP model was established by intrapancreatobiliary duct injection of 5% sodiumtaurocholate. A bolus of 10000 U/kg UTI was intravenously injected after SAP establishment. T cellapoptosis was determined by Annexin-V/PI double-staining. Oxidative stress was evaluated byexamining changes in the levels of reactive oxygen species (ROS). Total superoxide dismutase (SOD)in serum was tested by hydroxylamine colorimetric assay, and malondialdehyde levels were examinedby thiobarbituric acid assay. Mitochondrial function was evaluated by analyzing mitochondrialmembrane potential (MMP) and mitochondrial permeability transition pore (MPTP).Results: We found CD4+ T cells (32.10±2.87% vs. 45.22±4.38%, P<0.01) and CD4+/CD8+ T cells in SAPrats significantly decreased compared with sham group (1.15±0.12 vs. 2.23±0.12%, P<0.01), while thepercent of the apoptotic CD4+ and (17.70±2.10 vs. 3.82±0.50%, P<0.01) CD8+ T lymphocytes was highlyincreased (2.78±0.45 vs. 1.97±0.36%, P<0.01 compared with sham group). After UTI treatment, theapoptosis of CD4+ T lymphocytes significantly decreased compared with SAP group (8.58±1.09 vs.17.70±2.10%, P<0.01), while the percent of CD4+ T and CD4+/CD8+ lymphocytes significantly enhanced(P<0.01). ROS (mean fluorescence intensity): 5107±430 vs. 12904±840, P<0.01) and MDA levels(4.41±0.32 vs. 7.25±0.57nmol/ml, P<0.01) in serum in UTI-treated group were decreased comparedwith SAP group. SOD activity was enhanced after UTI treatment (59.72±5.45 vs. 48.32±3.81nmol/ml,P<0.01). Mitochondrial function assays showed that MMP (17.30±1.60 vs. 46.94±3.49%, P<0.01) andMPT (30.14±2.46 vs. 51.31±3.23%, P<0.01) were inhibited by UTI.Conclusion: UTI reduces T lymphocytes apoptosis and improves immunological function in SAP rats,possibly via enhancing the scavenging capacity of oxygen free radical and attenuating the influence ofoxidative stress.Key words: Ulinastatin, T cell, Apoptosis, Severe acute pancreatitis, Mitochondrion.
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