Cyclin D3 drives inertial cell cycling in dark zone germinal center B cells.

Cyclin D3 drives inertial cell cycling in dark zone germinal center B cells.
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DOI:
10.1084/jem.20201699
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发表时间:
2021-04-05
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Victora GD
Victora GD
中科院分区:
其他
文献类型:
--
作者:
Pae J;Ersching J;Castro TBR;Schips M;Mesin L;Allon SJ;Ordovas-Montanes J;Mlynarczyk C;Melnick A;Efeyan A;Shalek AK;Meyer-Hermann M;Victora GD

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细胞周期蛋白D3驱动一种独特的“惯性”细胞周期,负责生发中心暗区B细胞的克隆性增殖。在亲和力成熟过程中,生发中心(GC)B细胞在暗区(DZ)的增殖和体细胞高度突变和在光区(LZ)的亲和力依赖的选择之间交替。这种解剖学上的分离规定,允许阳性选择的GC B细胞克隆性扩张的旺盛增殖表面上是在没有触发LZ选择的信号的情况下发生的,就好像是通过“惯性”。我们发现,这种惯性循环特别需要细胞周期调节因子细胞周期蛋白D3。细胞周期蛋白D3依赖于剂量依赖地控制B细胞在DZ的增殖程度,并且对于GC B细胞在强大的T滤泡辅助细胞(TFH)帮助下的有效克隆性增殖是必不可少的。导入Burkitt淋巴瘤相关功能获得突变(T283A)的Ccnd3基因可导致较大的GCs增加DZ增殖,并在老年小鼠出现克隆性B细胞增殖,这表明DZ惯性细胞周期程序可被恶性转化的B细胞所取代。
Cyclin D3 drives a unique form of “inertial” cell cycling responsible for clonal expansion of B cells in the germinal center dark zone. During affinity maturation, germinal center (GC) B cells alternate between proliferation and somatic hypermutation in the dark zone (DZ) and affinity-dependent selection in the light zone (LZ). This anatomical segregation imposes that the vigorous proliferation that allows clonal expansion of positively selected GC B cells takes place ostensibly in the absence of the signals that triggered selection in the LZ, as if by “inertia.” We find that such inertial cycles specifically require the cell cycle regulator cyclin D3. Cyclin D3 dose-dependently controls the extent to which B cells proliferate in the DZ and is essential for effective clonal expansion of GC B cells in response to strong T follicular helper (Tfh) cell help. Introduction into the Ccnd3 gene of a Burkitt lymphoma–associated gain-of-function mutation (T283A) leads to larger GCs with increased DZ proliferation and, in older mice, clonal B cell lymphoproliferation, suggesting that the DZ inertial cell cycle program can be coopted by B cells undergoing malignant transformation.
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