Germinal center B cell and T follicular helper cell development initiates in the interfollicular zone.

Germinal center B cell and T follicular helper cell development initiates in the interfollicular zone.
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DOI:
10.1016/j.immuni.2011.03.024
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发表时间:
2011-06-24
期刊:
影响因子:
32.4
通讯作者:
Haberman AM
Haberman AM
中科院分区:
医学1区
文献类型:
--
作者:
Kerfoot SM;Yaari G;Patel JR;Johnson KL;Gonzalez DG;Kleinstein SH;Haberman AM

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我们将滤泡间(IF)区确定为生发中心B细胞和T滤泡辅助(Tfh)细胞分化起始的部位。在免疫后的前两天,抗原特异性T细胞和B细胞一直局限在IF区内,形成长期的相互作用,并上调转录抑制因子Bcl6。T细胞还获得了Tfh细胞标志物CXCR5、PD - 1和GL7。应答的B细胞和T细胞直接从IF区迁移到滤泡内部,T细胞比B细胞提前一天迁移。值得注意的是,在没有同源B细胞的情况下,Tfh细胞仍然形成并迁移到滤泡。然而,如果没有这种B细胞,PD - 1、ICOS和GL7不再在滤泡内的Bcl6高表达的T细胞上表达,尽管这些T细胞仍然存在于滤泡中。因此,抗原特异性B细胞是维持滤泡内PD - 1高表达、ICOS高表达、GL7高表达的Tfh细胞表型所必需的,但对于它们在IF区的初始分化不是必需的。
We identify the interfollicular (IF) zone as the site where germinal center B cell and T follicular helper (Tfh) cell differentiation initiates. For the first two days post-immunization, antigen-specific T and B cells remained confined within the IF zone, formed long-lived interactions, and upregulated the transcriptional repressor Bcl6. T cells also acquired the Tfh cell markers CXCR5, PD-1 and GL7. Responding B and T cells migrated to the follicle interior directly from the IF zone, T cell immigration preceding B cells by one day. Notably, in the absence of cognate B cells, Tfh cells still formed and migrated to the follicle. However, without such B cells, PD-1, ICOS and GL7 were no longer expressed on follicular Bcl6hi T cells that nevertheless persisted in the follicle. Thus, Ag-specific B cells are required for the maintenance of the PD-1hi ICOShi GL7hi Tfh cell phenotype within the follicle, but not for their initial differentiation in the IF zone.
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