Effect of Emodin in Suppressing Acute Rejection Following Liver Allograft Transplantation in Rats

【摘要】 <正>Objective:To investigate the mechanism of action of emodin for suppressing acute allograft rejection in a rat model of liver transplantation.Methods:Brown Norway(BW) recipient rats of orthotopic liver transplantation(OLT) were divided into three groups,Group A receiving isografting(with BW rats as donor), Group B receiving allografting(with Lewis rats as donor),Group C receiving allografting and emodin treatment (50 mg/kg daily).They were sacrificed on day 7 of post-transplantation,and their hepatic histology,plasma cytokine levels,and T-cell subset expression were detected.Results:Compared with those in Group A,rats in Group B exhibited severe allograft rejection with a rejection activity index(RAI) of 7.67±0.98,extensive hepatocellular apoptosis with an apoptosis index(Al) of 35.83±2.32,and elevated plasma levels of interleukin-2 (IL-2),interleukin-10(IL-10),tumor necrosis factor-α(TNF-α),CD4~+ and CD4~+/CD8~+ ratio.However,recipients in Group C showed a decrease in histological grade of rejection and hepatocellular apoptosis,as well as a decrease in plasma levels of IL-2,TNF-α,CD4~+ and CD4~+/CD8~+ ratio,but elevated levels of IL-10 as compared with the allograft group.Conclusion:Post-OLT acute rejection could be attenuated by emodin,its mechanism of action may be associated with protecting hepatocytes from apoptosis,polarizing the Th 1 paradigm to Th2,and inhibiting the proliferation of CD4~+ T cell in plasma.更多还原

【Abstract】 Objective:To investigate the mechanism of action of emodin for suppressing acute allograft rejection in a rat model of liver transplantation.Methods:Brown Norway(BW) recipient rats of orthotopic liver transplantation(OLT) were divided into three groups,Group A receiving isografting(with BW rats as donor), Group B receiving allografting(with Lewis rats as donor),Group C receiving allografting and emodin treatment (50 mg/kg daily).They were sacrificed on day 7 of post-transplantation,and their hepatic histology,plasma cytokine levels,and T-cell subset expression were detected.Results:Compared with those in Group A,rats in Group B exhibited severe allograft rejection with a rejection activity index(RAI) of 7.67±0.98,extensive hepatocellular apoptosis with an apoptosis index(Al) of 35.83±2.32,and elevated plasma levels of interleukin-2 (IL-2),interleukin-10(IL-10),tumor necrosis factor-α(TNF-α),CD4~+ and CD4~+/CD8~+ ratio.However,recipients in Group C showed a decrease in histological grade of rejection and hepatocellular apoptosis,as well as a decrease in plasma levels of IL-2,TNF-α,CD4~+ and CD4~+/CD8~+ ratio,but elevated levels of IL-10 as compared with the allograft group.Conclusion:Post-OLT acute rejection could be attenuated by emodin,its mechanism of action may be associated with protecting hepatocytes from apoptosis,polarizing the Th 1 paradigm to Th2,and inhibiting the proliferation of CD4~+ T cell in plasma.更多还原