Premature expression of T cell receptor (TCR)alphabeta suppresses TCRgammadelta gene rearrangement but permits development of gammadelta lineage T cells.

Premature expression of T cell receptor (TCR)alphabeta suppresses TCRgammadelta gene rearrangement but permits development of gammadelta lineage T cells.
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DOI:
10.1084/jem.192.4.537
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发表时间:
2000-08-21
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Fowlkes BJ
Fowlkes BJ
中科院分区:
其他
文献类型:
--
作者:
Terrence K;Pavlovich CP;Matechak EO;Fowlkes BJ

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T细胞受体(TCR)γδ和前TCR促进早期胸腺细胞前体的存活和成熟。这些受体是否也影响γδ相对于αβ谱系的确定尚不清楚。我们发现,当TCRαβ在T细胞发育早期表达时,TCRγδ基因重排在TCRαβ转基因小鼠中受到抑制。这种情况提供了检查当仅表达TCRαβ时γδ相对于αβ T谱系定型的结果的机会。我们发现,表达TCRαβ的前体胸腺细胞不仅如预期的那样在αβ途径中成熟,而且还作为具有γδ谱系细胞特性的CD4−CD8− T细胞。在TCRαβ转基因小鼠中,转基因受体表达相对较晚,TCRγδ重排正常发生,TCRαβ+CD4−CD8−细胞共表达TCRγδ。结果支持TCRαβ可以替代TCRγδ以允许γδ谱系选择和γδ谱系中的成熟的观点。这些发现可能符合一个模型,其中谱系承诺在TCR基因重排之前或独立于TCR基因重排确定。然而,这些结果可能与其中不同信号偏向谱系选择的模型相容,并且这些信号传导差异对于特定TCR结构不是绝对的或固有的。
The T cell receptor (TCR)γδ and the pre-TCR promote survival and maturation of early thymocyte precursors. Whether these receptors also influence γδ versus αβ lineage determination is less clear. We show here that TCRγδ gene rearrangements are suppressed in TCRαβ transgenic mice when the TCRαβ is expressed early in T cell development. This situation offers the opportunity to examine the outcome of γδ versus αβ T lineage commitment when only the TCRαβ is expressed. We find that precursor thymocytes expressing TCRαβ not only mature in the αβ pathway as expected, but also as CD4−CD8− T cells with properties of γδ lineage cells. In TCRαβ transgenic mice, in which the transgenic receptor is expressed relatively late, TCRγδ rearrangements occur normally such that TCRαβ+CD4−CD8− cells co-express TCRγδ. The results support the notion that TCRαβ can substitute for TCRγδ to permit a γδ lineage choice and maturation in the γδ lineage. The findings could fit a model in which lineage commitment is determined before or independent of TCR gene rearrangement. However, these results could be compatible with a model in which distinct signals bias lineage choice and these signaling differences are not absolute or intrinsic to the specific TCR structure.
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