Development of the immune system in human fetal liver.

Development of the immune system in human fetal liver.
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人类胎儿肝脏中免疫系统的发育。

DOI:
10.1007/978-94-009-3365-1_6
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发表时间:
1987
期刊:
Thymus
影响因子:
--
通讯作者:
R. Gale
R. Gale
中科院分区:
--
文献类型:
--
作者:
R. Gale

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胎儿肝脏是人类免疫系统发育的主要部位。前B淋巴细胞和B淋巴细胞在12周时以随机分布存在于人胎肝中,并随妊娠而增加。大多数胎儿肝细胞是前B细胞,但也存在成熟的B细胞。功能测定和移植实验表明,这些B细胞是功能性的,可以转移免疫记忆,虽然不完美,在胎肝重建受体。相反,T细胞的发育主要发生在胸腺中。T细胞的祖细胞存在于胎儿肝脏中,可以恢复辐射受体的T细胞免疫力。人胎肝含有1-2%的成熟T细胞;功能测定同样为阴性。NK细胞已在人胎肝中以低频率检测到。胎儿肝脏也含有非T、非B细胞,能够抑制同种异体抗原反应性T细胞的发育;这些细胞被称为否决细胞。总之,人胎肝含有几种类型淋巴细胞的祖细胞,是免疫发育的重要部位。它也可能在免疫系统成熟过程中诱导自身耐受中发挥作用。胎儿肝脏的这些特征可能对人类胎儿肝脏移植的成功具有重要意义。
Fetal liver is a major site of development of the human immune system. Pre-B and B-lymphocytes are present in the human fetal liver at 12 weeks in a random distribution and increase with gestation. Most fetal liver cells are pre-B but mature B-cells are also present. Functional assays and transplantation experiments indicate that these B-cells are functional and can transfer immunologic memory, albeit imperfectly, in fetal liver reconstituted recipients. T-cell development, in contrast, occurs predominantly in the thymus. Progenitors of T-cells are present in fetal liver and can restore T-cell immunity in irradiated recipients. Human fetal liver contains 1-2% mature T-cells; functional assays are likewise negative. NK cells have been detected in human fetal liver at low frequency. Fetal liver also contains non-T, non-B cells capable of suppressing the development of alloantigen reactive T-cells; these have been termed veto cells. In summary, human fetal liver contains progenitors of several types of lymphoid cells and is an important site of immune development. It also may play a role in the induction of self tolerance during maturation of the immune system. These features of fetal liver may have important implications for the success of fetal liver transplantation in man.
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