CCR7 signals are essential for cortex-medulla migration of developing thymocytes.

CCR7 signals are essential for cortex-medulla migration of developing thymocytes.
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CCR7信号对于发育中的胸腺细胞的皮层迁移至关重要。

DOI:
10.1084/jem.20040643
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发表时间:
2004-08-16
影响因子:
15.3
通讯作者:
Takahama, Y
Takahama, Y
中科院分区:
医学1区
文献类型:
--
作者:
Ueno, T;Saito, F;Gray, DHD;Kuse, S;Hieshima, K;Nakano, H;Kakiuchi, T;Lipp, M;Boyd, RL;Takahama, Y

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在TCR介导的阳性选择后,发育中的胸腺细胞在胸腺内从皮质重新定位到髓质以进一步分化和选择。然而,目前还不清楚胸腺细胞的皮质-髓质迁移是如何控制的,以及它如何控制T细胞发育。在这里,我们表明,在小鼠缺乏CCR 7或其配体成熟的单阳性胸腺细胞被逮捕的皮质和不积累在髓质。这些突变小鼠在形成胸腺髓质区方面有缺陷。这些小鼠的胸腺T细胞输出在新生儿期受到损害,但在成年期则没有。这些小鼠中的胸腺细胞在成熟、存活和对普遍存在的抗原的负选择方面没有缺陷。未成熟皮质胸腺细胞的TCR参与提高了CCR 7的细胞表面表达。这些结果表明,CCR 7信号是必不可少的积极选择的胸腺细胞从皮质到髓质的迁移。胸腺细胞的CCR 7依赖性皮质-髓质迁移在髓质形成和新生T细胞输出中起着至关重要的作用,但对于胸腺细胞的成熟、存活、负选择和成人输出不是必需的。
Upon TCR-mediated positive selection, developing thymocytes relocate within the thymus from the cortex to the medulla for further differentiation and selection. However, it is unknown how this cortex–medulla migration of thymocytes is controlled and how it controls T cell development. Here we show that in mice deficient for CCR7 or its ligands mature single-positive thymocytes are arrested in the cortex and do not accumulate in the medulla. These mutant mice are defective in forming the medullary region of the thymus. Thymic export of T cells in these mice is compromised during the neonatal period but not in adulthood. Thymocytes in these mice show no defects in maturation, survival, and negative selection to ubiquitous antigens. TCR engagement of immature cortical thymocytes elevates the cell surface expression of CCR7. These results indicate that CCR7 signals are essential for the migration of positively selected thymocytes from the cortex to the medulla. CCR7-dependent cortex–medulla migration of thymocytes plays a crucial role in medulla formation and neonatal T cell export but is not essential for maturation, survival, negative selection, and adult export of thymocytes.
胸腺和最近的胸腺移民在维持成年外周淋巴细胞库中的作用。
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