Plasma cells negatively regulate the follicular helper T cell program.

Plasma cells negatively regulate the follicular helper T cell program.
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DOI:
10.1038/ni.1954
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发表时间:
2010-12
期刊:
影响因子:
30.5
通讯作者:
--
中科院分区:
医学1区
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--
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B淋巴细胞在滤泡辅助T(TFH)细胞的抗原特异性控制下分化为抗体分泌细胞。在这里,我们证明了同种型转换的浆细胞表达MHCII,CD 80和CD 86和抗原呈递所需的细胞内机制。抗原特异性浆细胞能够在体内获取、加工和提呈足够的抗原,从而诱导多种TH细胞功能。重要的是,抗原致敏的浆细胞未能在幼稚TH细胞中诱导白细胞介素21或Bcl-6,并在抗原激活的TFH细胞中主动关闭这些关键分子。缺乏浆细胞的小鼠表现出TFH活性的改变,为这种负反馈回路提供了证据。因此,浆细胞的抗原呈递定义了一个新的同源调节层,其限制了控制进行中的B细胞免疫的抗原特异性TFH程序。
B lymphocytes differentiate into antibody-secreting cells under the antigen-specific control of follicular helper T (TFH) cells. Here, we demonstrate that isotype-switched plasma cells expressed MHCII, CD80 and CD86 and intracellular machinery required for antigen presentation. Antigen-specific plasma cells could access, process and present sufficient antigen in vivo to induce multiple TH cell functions. Importantly, antigen-primed plasma cells failed to induce interleukin 21 or Bcl-6 in naïve TH cells and actively shut down these key molecules in antigen-activated TFH cells. Mice lacking plasma cells displayed altered TFH activity, providing evidence for this negative feedback loop. Hence, antigen presentation by plasma cells defines a new layer of cognate regulation that limits the antigen-specific TFH program controlling ongoing B cell immunity.
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