Dectin-2-dependent NKT cell activation and serotype-specific antibody production in mice immunized with pneumococcal polysaccharide vaccine.

Dectin-2-dependent NKT cell activation and serotype-specific antibody production in mice immunized with pneumococcal polysaccharide vaccine.
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DOI:
10.1371/journal.pone.0078611
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Kawakami K
Kawakami K
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Miyasaka T;Akahori Y;Toyama M;Miyamura N;Ishii K;Saijo S;Iwakura Y;Kinjo Y;Miyazaki Y;Oishi K;Kawakami K

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尽管不依赖胸腺的 2 型抗原通常不会经历从 IgM 到 IgG 的 Ig 类别转换,但肺炎球菌多糖疫苗 (PPV) 会诱导血清型特异性 IgG 的产生。然而,这是如何发生的仍不清楚。在本研究中,PPV 免疫诱导野生型 (WT) 小鼠血清中产生特异性针对血清型 3-肺炎球菌多糖的 IgG 和 IgM,但这种现象在 Dectin-2 敲除 (KO) 小鼠中显着减少。 PPV 免疫导致 WT 小鼠产生 IL-12p40,但这种反应在 Dectin-2KO 小鼠中显着降低。同样,PPV 免疫会激活 WT 小鼠的自然杀伤 T (NKT) 细胞,但不会激活 Dectin-2KO 小鼠。此外,给予 α-半乳糖苷神经酰胺、重组 (r)IL-12 或 rIFN-γ 可以改善 Dectin-2KO 小鼠中降低的 IgG 水平,而中和性抗 IFN-γ mAb 治疗则导致 PPV 免疫的 WT 小鼠中 IgG 合成减少。从PPV免疫的WT小鼠中转移脾细胞可以为受体小鼠提供针对肺炎球菌感染的保护作用,而当从PPV免疫的Dectin-2KO小鼠中收获转移的脾细胞时,这种效果被取消。这些结果表明,通过 Dectin-2 检测 PPV 抗原会触发 IL-12 的产生,从而诱导 NKT 细胞合成 IFN-γ,并随后产生血清型特异性 IgG。
Although thymus-independent type 2 antigens generally do not undergo Ig class switching from IgM to IgG, pneumococcal polysaccharide vaccine (PPV) induces the production of serotype-specific IgG. How this happens remains unclear, however. In the present study, PPV immunization induced production of IgG as well as IgM specific for a serotype 3-pneumococcal polysaccharide in the sera of wild-type (WT) mice, but this phenomenon was significantly reduced in Dectin-2 knockout (KO) mice. Immunization with PPV caused IL-12p40 production in WT mice, but this response was significantly reduced in Dectin-2KO mice. Likewise, immunization with PPV activated natural killer T (NKT) cells in WT mice but not in Dectin-2KO mice. Furthermore, administration of α-galactosylceramide, recombinant (r)IL-12 or rIFN-γ improved the reduced IgG levels in Dectin-2KO mice, and treatment with neutralizing anti-IFN-γ mAb resulted in the reduction of IgG synthesis in PPV-immunized WT mice. Transfer of spleen cells from PPV-immunized WT mice conferred protection against pneumococcal infection on recipient mice, whereas this effect was cancelled when the transferred spleen cells were harvested from PPV-immunized Dectin-2KO mice. These results suggest that the detection of PPV antigens via Dectin-2 triggers IL-12 production, which induces IFN-γ synthesis by NKT cells and subsequently the production of serotype-specific IgG.
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