Germinal Center Hypoxia Potentiates Immunoglobulin Class Switch Recombination.

Germinal Center Hypoxia Potentiates Immunoglobulin Class Switch Recombination.
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DOI:
10.4049/jimmunol.1601401
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发表时间:
2016-11-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Sitkovsky M
Sitkovsky M
中科院分区:
其他
文献类型:
--
作者:
Abbott RK;Thayer M;Labuda J;Silva M;Philbrook P;Cain DW;Kojima H;Hatfield S;Sethumadhavan S;Ohta A;Reinherz EL;Kelsoe G;Sitkovsky M

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生殖中心(GC)是B细胞经历二次分化以产生高亲和力、类别转换抗体的解剖学位点。我们假设GC中增殖的B细胞创造了一个缺氧的微环境来控制它们的进一步分化。使用分子标记,我们发现GC主要是缺氧。与常氧(21% O2)相比,体外低氧培养条件(1% O2)加速了类别转换和浆细胞形成,并增强了B和CD 4 + T细胞上GL-7的表达。在免疫过程中通过呼吸60%O2来恢复GC缺氧导致GC B细胞、T滤泡辅助细胞(TFH)和浆细胞的频率降低,以及TFH上ICOS表达降低。重要的是,GC缺氧的逆转降低了抗原特异性血清IgG 1,并降低了抗原特异性GC内IgG 1 + B细胞的频率。总之,这些观察结果揭示了缺氧在GC B细胞分化中的关键作用。
Germinal centers (GCs) are anatomic sites where B cells undergo secondary diversification to produce high affinity, class switched antibodies. We hypothesized that proliferating B cells in GCs create a hypoxic microenvironment that governs their further differentiation. Using molecular markers, we found GCs to be predominantly hypoxic. Compared to normoxia (21% O2), hypoxic culture conditions (1% O2) in vitro accelerated class switching and plasma cell formation and enhanced expression of GL-7 on B and CD4+ T cells. Reversal of GC hypoxia in vivo by breathing 60% O2 during immunization resulted in reduced frequencies of GC B cells, T follicular helper (TFH) cells and plasmacytes, as well as lower expression of ICOS on TFH. Importantly, this reversal of GC hypoxia decreased antigen-specific serum IgG1 and reduced the frequency of IgG1+ B cells within the antigen specific GC. Taken together, these observations reveal a critical role for hypoxia in GC B cell differentiation.
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