Programmed cell death 1 suppresses B-1b cell expansion and long-lived IgG production in response to T cell-independent type 2 antigens.

Programmed cell death 1 suppresses B-1b cell expansion and long-lived IgG production in response to T cell-independent type 2 antigens.
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DOI:
10.4049/jimmunol.1101990
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发表时间:
2011-11-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Haas KM
Haas KM
中科院分区:
其他
文献类型:
--
作者:
Haas KM

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B1b 细胞在产生针对 T 细胞非依赖性 2 型 (TI-2) 抗原 (Ag) 的抗体 (Ab) 方面发挥着关键作用。然而,调节这种独特 B 细胞亚群产生抗体的因素尚不清楚。在这项研究中,使用正常小鼠对 B 细胞对 TNP-Ficoll 的反应进行了详细分析。 TNP-Ficoll 腹腔注射或静脉注射诱导 Ag 特异性 B-1b 细胞快速激活、扩增、同种型转换和浆母细胞/浆细胞分化。 Ag 特异性 B-1b 细胞数量在第 5 天达到峰值,然后在脾脏中逐渐下降,但在免疫后 40 天后腹膜腔中仍保持升高。除了表达 CD43、CD44 和 CD86 之外,Ag 激活的 B-1b 细胞还瞬时表达 PD-1,当缺乏额外的共刺激信号时,PD-1 可以功能性抑制 BCR 诱导的 B-1b 细胞体外增殖。在 TNP-Ficoll 免疫过程中抑制 PD-1:PD-1 配体 (PDL) 相互作用可显着增强 Ag 特异性 B-1b 细胞扩增以及 IgG 同种型转换和浆母细胞/浆细胞分化的频率。值得注意的是,免疫后第一周内的 PD-1 mAb 阻断导致脾脏和骨髓 Ag 特异性 IgG3 的数量显着增加,但 IgM 的数量没有显着增加,在早期(第 5 天)和晚期(第 6 周)时间点分泌细胞。此外,在免疫后至少 6 周内,相对于对照 Ab 处理的小鼠,PD-1 mAb 处理的小鼠中 Ag 特异性血清 IgG3 以及 IgG2c、IgG2b 和 IgA 水平仍然显着升高。因此,在最初的 TI-2 Ag 相遇后不久发生的 PD-1:PDL 相互作用在抑制 Ag 特异性 B-1b 细胞扩增和长期产生 IgG 的骨髓和脾细胞的发育中发挥着关键作用。
B1b cells play a key role in producing antibodies (Ab) against T cell-independent type 2 (TI-2) antigens (Ags). However, the factors regulating Ab production by this unique B cell subset are not well understood. In this study, a detailed analysis of the B cell response to TNP-Ficoll was performed using normal mice. TNP-Ficoll delivered i.p. or i.v. induced rapid Ag-specific B-1b cell activation, expansion, isotype switching and plasmablast/plasma cell differentiation. Ag-specific B-1b cell numbers peaked at day 5 and then gradually declined in the spleen but remained elevated in the peritoneal cavity beyond 40 days post-immunization. In addition to expressing CD43, CD44, and CD86, Ag-activated B-1b cells transiently expressed PD-1, which functionally suppressed BCR-induced B-1b cell in vitro proliferation when additional costimulatory signals were lacking. Inhibiting PD-1:PD-1 ligand (PDL) interactions during TNP-Ficoll immunization significantly enhanced Ag-specific B-1b cell expansion and the frequency of IgG isotype switching and plasmablast/plasma cell differentiation. Remarkably, PD-1 mAb blockade during the first week following immunization resulted in significantly increased numbers of both splenic and bone marrow Ag-specific IgG3, but not IgM, secreting cells at both early (day 5) and late (week 6) timepoints. Moreover, Ag-specific serum IgG3, as well as IgG2c, IgG2b, and IgA levels remained significantly elevated in PD-1 mAb-treated relative to control Ab-treated mice for at least 6 weeks post-immunization. Thus, PD-1:PDL interactions occurring shortly after initial TI-2 Ag encounter play a critical role in suppressing Ag-specific B-1b cell expansion and the development of long-term IgG-producing bone marrow and spleen cells.
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发表时间: 2008
影响因子: --
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