Memory CD4 T cells that express CXCR5 provide accelerated help to B cells.

Memory CD4 T cells that express CXCR5 provide accelerated help to B cells.
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DOI:
10.4049/jimmunol.1002955
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发表时间:
2011-03-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Marrack P
Marrack P
中科院分区:
其他
文献类型:
--
作者:
MacLeod MK;David A;McKee AS;Crawford F;Kappler JW;Marrack P

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CD4T细胞对B细胞的帮助对于有效的抗体反应至关重要。虽然许多参与幼稚CD4T细胞辅助功能的分子已经被表征,但对记忆性CD4T细胞的辅助功能知之甚少,这是设计旨在启动保护性记忆CD4T细胞的疫苗的一个重要考虑因素。在这里,我们证明了小鼠记忆的CD4T细胞使B细胞能够比主要的反应性CD4T细胞更快地扩张和更早地转换类别。这种加速的响应不需要大量的存储单元,并且类似数量的主响应单元提供的有效帮助不如存储单元。然而,只有表达B细胞毛囊归巢分子CXCR5的记忆CD4T细胞能够加速这一反应。因此,抗体反应的快速程度取决于CD4记忆T细胞向B细胞快速迁移的能力。
CD4 T cell help for B cells is critical for effective antibody responses. While many of the molecules involved in helper functions of naïve CD4 T cells have been characterized, much less is known about the helper capabilities of memory CD4 T cells, an important consideration for the design of vaccines that aim to prime protective memory CD4 T cells. Here we demonstrate that mouse memory CD4 T cells enable B cells to expand more rapidly and class switch earlier than primary responding CD4 T cells. This accelerated response does not require large numbers of memory cells and similar numbers of primary responding cells provide less effective help than memory cells. However, only memory CD4 T cells that express the B cell follicle homing molecule, CXCR5, are able to accelerate the response. Therefore, the rapidity of the antibody response depends on the ability of CD4 memory T cells to migrate quickly towards B cells.
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