Natural killer cell development and function precede alpha beta T cell differentiation in mouse fetal thymic ontogeny.

Natural killer cell development and function precede alpha beta T cell differentiation in mouse fetal thymic ontogeny.
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在小鼠胎儿胸腺个体发育中,自然杀伤细胞的发育和功能先于 αβT 细胞分化。

DOI:
10.4049/jimmunol.160.2.744
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发表时间:
1998
影响因子:
4.4
通讯作者:
J. Zúñiga
J. Zúñiga
中科院分区:
医学2区
文献类型:
--
作者:
J. Carlyle;A. Michie;Sarah K. Cho;J. Zúñiga

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自然杀伤 (NK) 细胞介导病毒感染细胞和肿瘤细胞的 MHC 无限制细胞溶解。在成年小鼠中,NK 细胞是骨髓来源的淋巴细胞,主要在胸腺外位置成熟,但也有人认为与 T 淋巴细胞共享共同的胸腺内祖细胞。然而,成熟的 NK 细胞被认为在小鼠胎儿个体发育中不存在。我们报告早在妊娠第 13 天就存在具有成熟 NK 细胞表型 (NK1.1+/CD117-) 的胸腺细胞,大约在 T 淋巴细胞发育中出现 CD4+/CD8+ 细胞前 3 天。这些成熟的胎儿胸腺 NK 细胞表达与 NK 细胞效应功能相关的基因,并且在新鲜分离时,在体外表现出不受 MHC 限制的细胞溶解活性。此外,胎儿胸腺 NK 细胞在体外和体内持续生长的能力,除了与早期前体胸腺细胞的表型非常相似之外,也混淆了之前对 NK 谱系前体功能的评估。因此,成熟的 NK 细胞可能无意中包含在先前鉴定多能和双能前体胸腺细胞的尝试中。这些结果提供了小鼠胎儿个体发育中功能性 NK 淋巴细胞的第一个证据,并证明 NK 细胞成熟先于胎儿胸腺中的 αβ T 细胞发育。
Natural killer (NK) cells mediate MHC-unrestricted cytolysis of virus-infected cells and tumor cells. In the adult mouse, NK cells are bone marrow-derived lymphocytes that mature predominantly in extrathymic locations but have also been suggested to share a common intrathymic progenitor with T lymphocytes. However, mature NK cells are thought to be absent in mouse fetal ontogeny. We report the existence of thymocytes with a mature NK cell phenotype (NK1.1+/CD117-) as early as day 13 of gestation, approximately 3 days before the appearance of CD4+/CD8+ cells in T lymphocyte development. These mature fetal thymic NK cells express genes associated with NK cell effector function and, when freshly isolated, display MHC-unrestricted cytolytic activity in vitro. Moreover, the capacity of fetal thymic NK cells for sustained growth both in vitro and in vivo, in addition to their close phenotypic resemblance to early precursor thymocytes, confounds previous assessments of NK lineage precursor function. Thus, mature NK cells may have been inadvertently included in previous attempts to identify multipotent and bipotent precursor thymocytes. These results provide the first evidence of functional NK lymphocytes in mouse fetal ontogeny and demonstrate that NK cell maturation precedes alpha beta T cell development in the fetal thymus.
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