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EASL 2014:科研人员成功构建用于HBV细胞免疫研究的嵌合体小鼠模型

2014-05-13 佚名 dxy

人类肝脏嵌合体小鼠模型在许多肝脏疾病研究中其很大的作用。包括嗜肝病毒感染,如HBV,HCV和疟疾等。此外,从人胎肝中提取的造血干细胞(HSCs)可以在免疫缺陷小鼠中重构出人肝细胞群。 目前最主要的困难是人胎肝祖细胞(FLPCs)无法在人类肝脏嵌合体动物模型中复制生长。来自纽约洛克菲勒大学的研究人员通过同时移植HSCs和FLPCs,构建人类肝脏和免疫系统的嵌合体小鼠模型。该研究成果发布在2014年4

人类肝脏嵌合体小鼠模型在许多肝脏疾病研究中其很大的作用。包括嗜肝病毒感染,如HBV,HCV和疟疾等。此外,从人胎肝中提取的造血干细胞(HSCs)可以在免疫缺陷小鼠中重构出人肝细胞群。

目前最主要的困难是人胎肝祖细胞(FLPCs)无法在人类肝脏嵌合体动物模型中复制生长。来自纽约洛克菲勒大学的研究人员通过同时移植HSCs和FLPCs,构建人类肝脏和免疫系统的嵌合体小鼠模型。该研究成果发布在2014年4月12日在伦敦举行的EASL2014会上。

研究人员通过给FAH-/-NOD RAG1-/- IL2Rg null(FNRG)小鼠同时或依次灌输人类FLPCs和人类造血干细胞,从而使小鼠可以同时重组出同源的人体肝脏和淋巴细胞。

研究发现,补充人体细胞因子抑瘤素-M 可以将FLPC植入率增强5-10倍。通过移植FLPCs和造血干细胞,研究人员使小鼠体内产生了中等水平人类肝脏嵌合体和良好的免疫重建。

小鼠体内的血清含有10-100mcg/ml人白蛋白,20%-80%外周血单个核细胞的是人类的。感染HBV后这些小鼠出现快速和持续的病毒血症。除了肝T细胞和B细胞的再增殖,双重移植的小鼠体内出现生理水平肝内NK细胞。这在只移植人类造血干细胞的小鼠中未观察到。

研究结果发现,目前免疫缺陷肝脏嵌合体小鼠模型得到了显著改善。这将大大促进人类肝脏疾病的研究,包括乙肝病毒感染后的细胞免疫。

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    2014-11-07 klivis
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    2014-09-11 millore
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    2014-05-15 kord1983
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    2014-05-15 lq1771

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