Extrathymic T Cell Lymphopoiesis

Extrathymic T Cell Lymphopoiesis
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胸腺外 T 细胞淋巴细胞生成

DOI:
--
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发表时间:
2003
影响因子:
15.3
通讯作者:
P. Vassalli
P. Vassalli
中科院分区:
医学1区
文献类型:
--
作者:
D. Guy‐grand;O. Azogui;S. Celli;S. Darche;M. Nussenzweig;P. Kourilsky;P. Vassalli

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在没有胸腺生成的情况下,T淋巴细胞仍然存在,主要存在于肠上皮细胞中。胸腺外途径的个体发生及其在正常胸腺小鼠中的参与程度是有争议的。这些问题已经通过评估重组酶激活基因(RAG)的表达,通过使用绿色荧光蛋白RAG 2转基因小鼠模型得到解决。在无胸腺小鼠中,T淋巴细胞生成主要发生在肠系膜淋巴结中,派伊尔集合淋巴结中较少。这种淋巴细胞生成的个体发生步骤类似于胸腺生成,但明显偏向于γδ T细胞的产生,寡克隆αβ T细胞的缺乏可能是由于阳性选择的缺陷。无论是在无胸腺或正常胸腺小鼠,T上皮内淋巴细胞(IEL),也没有cryptopatch细胞(报告含有IEL的前体)显示荧光,表明最近RAG蛋白合成。新产生的T细胞从肠系膜淋巴结迁移到胸导管淋巴液中到达肠粘膜。在正常胸腺小鼠中,这种胸腺外途径被完全抑制,除了在严重的淋巴细胞耗竭的情况下。因此,在正常动物中,所有肠道T IEL,包括CD 8 αα+细胞,都是胸腺来源的,CD 8 αα+ TCRαβ+ IEL可能是双阴性NK 1 -1−胸腺细胞的后代,后者显示多克隆Vα和Vβ谱系。
In the absence of thymopoiesis, T lymphocytes are nevertheless present, mainly in the gut epithelium. Ontogeny of the extrathymic pathway and the extent of its involvement in euthymic mice are controversial. These questions have been addressed by assessing the expression of recombinase activating gene (RAG) through the use of green fluorescent protein RAG2 transgenic mouse models. In athymic mice, T lymphopoiesis occurs mainly in the mesenteric lymph node and less in the Peyer's patches. Ontogenic steps of this lymphopoiesis resemble those of thymopoiesis, but with an apparent bias toward γδ T cell production and with a paucity of oligoclonal αβ T cells possibly resulting from a deficit in positive selection. Whether in athymic or euthymic mice, neither T intraepithelial lymphocytes (IEL) nor cryptopatch cells (reported to contain precursors of IEL) displayed fluorescence indicating recent RAG protein synthesis. Newly made T cells migrate from the mesenteric node into the thoracic duct lymph to reach the gut mucosa. In euthymic mice, this extrathymic pathway is totally repressed, except in conditions of severe lymphocytic depletion. Thus, in normal animals, all gut T IEL, including CD8αα+ cells, are of thymic origin, CD8αα+ TCRαβ+ IEL being the likely progeny of double negative NK1-1− thymocytes, which show polyclonal Vα and Vβ repertoires.
胸腺定向 T 淋巴细胞成熟的新途径。
DOI: --
发表时间: 1994
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
Lefrancois,L;Olson,S
通讯作者: Olson,S