他克莫司与来氟米特对异种胰岛移植术后T细胞亚群的影响

目的 研究他克莫司(FK506)和来氟米特(Lef)对异种胰岛移植后急性排斥反应的抑制作用。方法 将大鼠胰岛移植于糖尿病小鼠肾被膜下。观察移植后不用药对照组、单独应用FK506组、单独应用Lef组以及联合应用FK506和Lef组的胰岛存活情况；并于移植后第5d检测外周血T细胞亚群分布和血清IL-2含量。结果 单独用药组与不用药对照组比较，胰岛存活时间明显延长；联合用药组又明显长于单独用药组。各用药组外周血CD4 T淋巴细胞明显低于未用药组。结论 FK506与Lef通过抑制CD4 T淋巴细胞的增殖而阻止或延缓异种胰岛移植的急性排斥反应。

Effect of FK506 and Leflunomide on T-cell subsets after islet xenotransplantation

Objective To assess the preventive effects of FK506 and Leflunomide (Lef) on islet xenograft acute rejection in rat-to-mouse models. Methods The islets of rat were transplanted under the kidney capsule of streptozotocin-induced diabetic mouse. The recipients were randomly divided into control group, un-treatment group, mono-therapy group and combination-therapy group. All immunosuppressants were administrated daily from 0 to 9 days. CD4 +, CD8 + T-cell subsets and IL-2 were examined on the 5?th day after transplantation. Results Compared with un-treatment group, xenoislet survival could be significally prolonged in mono-therapy group. Combination-therapy of FK506 with Lef could significantly prolong the survival of xenoislet when compared with FK506 or Lef used alone. The number of CD4 + T-cells in mono-therapy group and combination-therapy group was much less than in un-treatment group. Conclusion Both FK506 and Lef can suppress proliferation of CD4 + T-cells and prevent or delay islet xenograft rejection.