Immature CD8 Single-Positive Thymocytes Are a Molecularly Distinct Subpopulation, Selectively Dependent on BRD4 for Their Differentiation.

Immature CD8 Single-Positive Thymocytes Are a Molecularly Distinct Subpopulation, Selectively Dependent on BRD4 for Their Differentiation.
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DOI:
10.1016/j.celrep.2018.06.007
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发表时间:
2018-07-03
期刊:
影响因子:
8.8
通讯作者:
Singer DS
Singer DS
中科院分区:
生物学1区
文献类型:
--
作者:
Gegonne A;Chen QR;Dey A;Etzensperger R;Tai X;Singer A;Meerzaman D;Ozato K;Singer DS

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胸腺中的 T 细胞分化按照有序的发育事件顺序进行,其特征是 CD4 和 CD8 辅助受体的可变表达。在这里,我们报告说,未成熟的单阳性(ISP)胸腺细胞在分子上与胸腺中所有其他T细胞群不同,其基因谱的表达依赖于转录因子BRD4。在胸腺分化的各个阶段条件性删除 BRD4 表明,BRD4 通过靶向细胞周期和代谢途径选择性地调节 ISP 的进一步分化,但不影响导致 ISP 产生的广泛增殖。这些研究得出的结论是,ISP 亚群不是混合过渡态,而是选择性依赖于 BRD4 的分子上不同的亚群。胸腺细胞从未成熟的 DN 分化为 ISP、DP 和单阳性胸腺细胞。格贡内等人。报告发现,BRD4 在从未成熟的 ISP 到 DP 胸腺细胞的转变中是必需的,但对于 DN 胸腺细胞的分化或来自 DP 阶段的传统单阳性胸腺细胞的成熟来说不需要。
T cell differentiation in the thymus proceeds in an ordered sequence of developmental events characterized by variable expression of CD4 and CD8 coreceptors. Here, we report that immature single-positive (ISP) thymocytes are molecularly distinct from all other T cell populations in the thymus in their expression of a gene profile that is dependent on the transcription factor BRD4. Conditional deletion of BRD4 at various stages of thymic differentiation reveals that BRD4 selectively regulates the further differentiation of ISPs by targeting cell cycle and metabolic pathways, but it does not affect the extensive proliferation that results in the generation of ISPs. These studies lead to the conclusion that the ISP subpopulation is not a hybrid transitional state but a molecularly distinct subpopulation that is selectively dependent on BRD4. Thymocytes differentiate from immature DN to ISP, DP, and single-positive thymocytes. Gegonne et al. report the finding that BRD4 is required at the transition from immature ISP to DP thymocytes but not for the differentiation of DN thymocytes or the maturation of conventional single-positive thymocytes from the DP stage.
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