Notch-induced T cell development requires phosphoinositide-dependent kinase 1.

Notch-induced T cell development requires phosphoinositide-dependent kinase 1.
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DOI:
10.1038/sj.emboj.7601761
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发表时间:
2007-07-25
期刊:
影响因子:
11.4
通讯作者:
Cantrell, Doreen A.
Cantrell, Doreen A.
中科院分区:
生物学1区
文献类型:
--
作者:
Kelly, April P.;Finlay, David K.;Hinton, Heather J.;Clarke, Rosie G.;Fiorini, Emma;Radtke, Freddy;Cantrell, Doreen A.
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磷酸肌醇依赖性激酶I(PDK 1)磷酸化并激活多种AGC丝氨酸激酶,包括蛋白激酶B(PK B)、p70核糖体S6激酶(S6 K)和p90核糖体S6激酶(RSK)。PDK 1是胸腺细胞分化和增殖所需的,在此,我们探索PDK 1在T淋巴细胞发育中这些基本功能的分子基础。一个关键的发现是PDK 1是T细胞祖细胞中关键营养受体表达所必需的:CD 71转铁蛋白受体和CD 98 L-氨基酸转运蛋白亚基。PDK 1也是胸腺细胞中Notch介导的营养和增殖反应所必需的。支持PKB活化但不支持其他AGC激酶的PDK 1突变体PDK 1 L155 E可以恢复前T细胞中的CD 71和CD 98表达并恢复胸腺细胞分化。然而,PDK 1 L155 E不足以促进胸腺细胞增殖。因此,PDK 1在胸腺发育中的作用超出了其调节PKB的能力。此外,AGC激酶如S6 K和RSK的PDK 1磷酸化也是胸腺细胞发育所必需的。
Phosphoinositide-dependent kinase l (PDK1) phosphorylates and activates multiple AGC serine kinases, including protein kinase B (PKB), p70Ribosomal S6 kinase (S6K) and p90Ribosomal S6 kinase (RSK). PDK1 is required for thymocyte differentiation and proliferation, and herein, we explore the molecular basis for these essential functions of PDK1 in T lymphocyte development. A key finding is that PDK1 is required for the expression of key nutrient receptors in T cell progenitors: CD71 the transferrin receptor and CD98 a subunit of L-amino acid transporters. PDK1 is also essential for Notch-mediated trophic and proliferative responses in thymocytes. A PDK1 mutant PDK1 L155E, which supports activation of PKB but no other AGC kinases, can restore CD71 and CD98 expression in pre-T cells and restore thymocyte differentiation. However, PDK1 L155E is insufficient for thymocyte proliferation. The role of PDK1 in thymus development thus extends beyond its ability to regulate PKB. In addition, PDK1 phosphorylation of AGC kinases such as S6K and RSK is also necessary for thymocyte development.
DOI: 10.1084/jem.20061442
发表时间: 2007-02-19
期刊: The Journal of experimental medicine
影响因子: --
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发表时间: 2004-05-01
期刊: NATURE IMMUNOLOGY
影响因子: 30.5
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