Cutting edge: CXCR4 is critical for CD8+ memory T cell homeostatic self-renewal but not rechallenge self-renewal.

Cutting edge: CXCR4 is critical for CD8+ memory T cell homeostatic self-renewal but not rechallenge self-renewal.
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DOI:
10.4049/jimmunol.1400488
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发表时间:
2014-08-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Reiner SL
Reiner SL
中科院分区:
其他
文献类型:
--
作者:
Chaix J;Nish SA;Lin WH;Rothman NJ;Ding L;Wherry EJ;Reiner SL

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中央记忆 (CM) CD8+ T 细胞“记住”先前的遭遇,因为它们在没有持续挑战的情况下通过细胞分裂维持自身(稳态自我更新),并在二次抗原遭遇期间制造效应细胞时再现中央记忆命运(重新挑战自我更新)。我们测试了条件性删除骨髓 (BM) 归巢受体 CXCR4 对抗病毒 T 细胞反应的影响。 CXCR4 缺陷的 CD8+ T 细胞由于稳态增殖缺陷而损害了记忆细胞的维持。然而,在重新受到攻击后,CXCR4 缺陷的 T 细胞可以重新扩展并更新中央记忆池,同时产生次级效应细胞。 CD8+ T 细胞稳态自我更新所必需的关键 BM 衍生信号似乎对于在再攻击期间产生自我更新、功能不对称的细胞命运来说是可有可无的。
Central memory (CM) CD8+ T cells “remember” prior encounters because they maintain themselves through cell division in the absence of ongoing challenge (homeostatic self-renewal) as well as reproduce the central memory fate while manufacturing effector cells during secondary antigen encounters (rechallenge self-renewal). We tested the consequence of conditional deletion of the bone marrow (BM) homing receptor CXCR4 on antiviral T cell responses. CXCR4-deficient CD8+ T cells have impaired memory cell maintenance due to defective homeostatic proliferation. Upon rechallenge, however, CXCR4-deficient T cells can re-expand and renew the central memory pool while producing secondary effector cells. The critical BM-derived signals essential for CD8+ T cell homeostatic self-renewal appear to be dispensable to yield self-renewing, functionally asymmetric cell fates during rechallenge.
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