巨噬细胞在稳态下诱导具有天然样特性的γδ T细胞长期滞留于次级淋巴器官内。

Macrophages Induce Long-Term Trapping of γδ T Cells with Innate-like Properties within Secondary Lymphoid Organs in the Steady State.

作者信息

Audemard-Verger Alexandra, Rivière Matthieu, Durand Aurélie, Peranzoni Elisa, Guichard Vincent, Hamon Pauline, Bonilla Nelly, Guilbert Thomas, Boissonnas Alexandre, Auffray Cédric, Eberl Gérard, Lucas Bruno, Martin Bruno

机构信息

Institut Cochin, CNRS UMR8104, INSERM U1016, Paris Descartes Université, 75014 Paris, France.

Paris Diderot Université, 75013 Paris, France.

出版信息

J Immunol. 2017 Sep 15;199(6):1998-2007. doi: 10.4049/jimmunol.1700430. Epub 2017 Aug 4.

Abstract

So far, peripheral T cells have mostly been described to circulate between blood, secondary lymphoid organs (SLOs), and lymph in the steady state. This nomadic existence would allow them to accomplish their surveying task for both foreign Ags and survival signals. Although it is now well established that γδ T cells can be rapidly recruited to inflammatory sites or in certain tumor microenvironments, the trafficking properties of peripheral γδ T cells have been poorly studied in the steady state. In the present study, we highlight the existence of resident γδ T cells in the SLOs of specific pathogen-free mice. Indeed, using several experimental approaches such as the injection of integrin-neutralizing Abs that inhibit the entry of circulating lymphocytes into lymph nodes and long-term parabiosis experiments, we have found that, contrary to Ly-6CCD44 and Ly-6CCD44 γδ T cells, a significant proportion of Ly-6CCD44 γδ T cells are trapped for long periods of time within lymph nodes and the spleen in the steady state. Specific in vivo cell depletion strategies have allowed us to demonstrate that macrophages are the main actors involved in this long-term retention of Ly-6CCD44 γδ T cells in SLOs.

摘要

到目前为止,外周T细胞大多被描述为在稳态下在血液、二级淋巴器官(SLO)和淋巴之间循环。这种游动的存在方式使它们能够完成对外来抗原和生存信号的监测任务。虽然现在已经明确γδT细胞可以迅速被招募到炎症部位或某些肿瘤微环境中,但外周γδT细胞在稳态下的迁移特性却鲜有研究。在本研究中,我们强调了在无特定病原体小鼠的SLO中存在驻留γδT细胞。事实上,通过使用多种实验方法,如注射抑制循环淋巴细胞进入淋巴结的整合素中和抗体以及长期联体共生实验,我们发现,与Ly-6C⁺CD44⁻和Ly-6C⁻CD44⁻γδT细胞相反,相当一部分Ly-6C⁺CD44⁺γδT细胞在稳态下会长期滞留在淋巴结和脾脏内。特定的体内细胞清除策略使我们能够证明巨噬细胞是参与Ly-6C⁺CD44⁺γδT细胞在SLO中长期滞留的主要因素。

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