AIM: To determine whether normal genetically immunocompetent rodent hosts could be manipulated to accept human hepatocyte transplants with long term survival without immunosuppression. METHODS: Tolerance towards human...AIM: To determine whether normal genetically immunocompetent rodent hosts could be manipulated to accept human hepatocyte transplants with long term survival without immunosuppression. METHODS: Tolerance towards human hepatocytes was established by injection of primary human hepatocytes or Huh7 human hepatoma cells into the peritoneal cavities of fetal rats. Corresponding cells were subsequently transplanted into newborn rats via intrasplenic injection within 24h after birth. RESULTS: Mixed lymphocyte assays showed that spleen cells from non-tolerized rats were stimulated to proliferate when exposed to human hepatocytes, while cells from tolerized rats were not. Injections made between 15 d and 17 d of gestation produced optimal tolerization. Transplanted human hepatocytes in rat livers were visualized by immunohistochemical staining of human albumin. By dot blotting of genomic DNA in livers of tolerized rats 16 weeks after hepatocyte transplantation, it was found that approximately 2.5 X 10(5) human hepatocytes survived per rat liver. Human albumin mRNA was detected in rat livers by RT-PCR for 15 wk, and human albumin protein was also detectable in rat serum. CONCLUSION: Tolerization of an immuno-competent rat can permit transplantation, and survival of functional human hepatocytes.展开更多
文摘AIM: To determine whether normal genetically immunocompetent rodent hosts could be manipulated to accept human hepatocyte transplants with long term survival without immunosuppression. METHODS: Tolerance towards human hepatocytes was established by injection of primary human hepatocytes or Huh7 human hepatoma cells into the peritoneal cavities of fetal rats. Corresponding cells were subsequently transplanted into newborn rats via intrasplenic injection within 24h after birth. RESULTS: Mixed lymphocyte assays showed that spleen cells from non-tolerized rats were stimulated to proliferate when exposed to human hepatocytes, while cells from tolerized rats were not. Injections made between 15 d and 17 d of gestation produced optimal tolerization. Transplanted human hepatocytes in rat livers were visualized by immunohistochemical staining of human albumin. By dot blotting of genomic DNA in livers of tolerized rats 16 weeks after hepatocyte transplantation, it was found that approximately 2.5 X 10(5) human hepatocytes survived per rat liver. Human albumin mRNA was detected in rat livers by RT-PCR for 15 wk, and human albumin protein was also detectable in rat serum. CONCLUSION: Tolerization of an immuno-competent rat can permit transplantation, and survival of functional human hepatocytes.
文摘目的比较免疫功能正常的卡氏肺孢子菌肺炎(Pneumocystis carinii pneumonia,PCP)与免疫功能受损PCP的临床特征,以提高对该病的诊疗水平。方法按照免疫功能正常和受损两种状态,以病原学诊断为基础,将患者分为无基础疾病感染组(PCP without basic disease,NBD-PCP)和肾移植术后组(PCP after kidney transplantation,KT-PCP),两组均7例。采集两组患者的临床表现、实验室检查及肺部CT检查资料,对各指标进行单因素方差分析。结果NBD-PCP组与KT-PCP组的临床表现和肺部CT影像学特征比较,并无轻症化趋势。发热和干咳、弥散分布于双侧肺部的磨玻璃样改变、最大病变范围>10 cm、少数伴肺门和纵隔淋巴结肿大和胸腔积液等指标的差异均无统计学意义(均P>0.05);C反应蛋白升高在两组间的差异具有统计学意义(P<0.05)。结论免疫功能正常和受损两种状态下,PCP患者均具有严重的间质性肺炎临床表现和肺部损伤影像学特征,免疫功能正常患者没有出现轻症化趋势;C反应蛋白升高在免疫功能正常组更为明显,可以作为鉴别诊断的指标。
