BAFF- and APRIL-dependent maintenance of antibody titers after immunization with T-dependent antigen and CD1d-binding ligand.

BAFF- and APRIL-dependent maintenance of antibody titers after immunization with T-dependent antigen and CD1d-binding ligand.
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DOI:
10.4049/jimmunol.1300263
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发表时间:
2013-08-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Lang ML
Lang ML
中科院分区:
其他
文献类型:
--
作者:
Shah HB;Joshi SK;Rampuria P;Devera TS;Lang GA;Stohl W;Lang ML

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CD1d 限制的不变自然杀伤 T (iNKT) 细胞可增强对 T 依赖性 Ag 的体液免疫,这些 Ag 与 CD1d 结合糖脂 Ag α-半乳糖神经酰胺 (α-GC) 共同施用。缺乏 iNKT 细胞的小鼠在接种疫苗后抗体反应减弱的观察结果得出这样的假设:iNKT 细胞表达维持特定抗体滴度的浆细胞 (PC) 生存因子。制备整个造血室或 iNKT 细胞选择性缺乏 BAFF、APRIL 或 BAFF 和 APRIL 两者的骨髓 (BM) 嵌合小鼠,并用吸附到明矾或与 α-GC 混合的 NP-KLH 进行免疫。与 BAFF 或 APRIL 充足的 BM 嵌合体相比,造血室和 iNKT 衍生的 BAFF 和 APRIL 的缺失与 Ab 滴度快速衰减和 PC 数量减少相关。当使用 α-GC 作为免疫佐剂时,iNKT 细胞衍生的 BAFF 或 APRIL 在 PC 存活中发挥更大作用。这些结果表明,iNKT 衍生的 BAFF 和 APRIL 各自有助于免疫诱导的 PC 的存活。这项研究为 iNKT 细胞影响体液免疫的机制提供了新的线索,并可能为含有糖脂佐剂的疫苗的设计提供信息。
CD1d-restricted invariant Natural Killer T (iNKT) cells boost humoral immunity to T-dependent Ags that are co-administered with the CD1d-binding glycolipid Ag α-galactosylceramide (α-GC). Observations that mice lacking iNKT cells have decaying Ab responses following vaccination has led to the hypothesis that iNKT cells express plasma cell (PC) survival factors that sustain specific Ab titers. Bone marrow (BM) chimeric mice in which the entire hematopoetic compartment or iNKT cells selectively lacked BAFF, APRIL, or both BAFF and APRIL were created and immunized with NP-KLH adsorbed to Alum or mixed with α-GC. In comparison to BAFF- or APRIL-sufficient BM chimeras, absence of hematopoetic compartment- and iNKT-derived BAFF and APRIL was associated with rapidly decaying Ab titers and reduced PC numbers. The iNKT cell-derived BAFF or APRIL assumed a greater role in PC survival when α-GC was used as the adjuvant for immunization. These results show that iNKT-derived BAFF and APRIL each contribute to survival of PCs induced by immunization. This study sheds new light on the mechanisms through which iNKT cells impact humoral immunity and may inform design of vaccines that incorporate glycolipid adjuvants.
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