Regulation of Th17 Differentiation by IKKα-Dependent and -Independent Phosphorylation of RORγt.
Regulation of Th17 Differentiation by IKKα-Dependent and -Independent Phosphorylation of RORγt.
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RORγT的IKKα依赖性和非依赖性磷酸化对Th17分化的调节。
DOI:
10.4049/jimmunol.1700457
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发表时间:
2017-08-01
期刊:
影响因子:
--
通讯作者:
Sun Z
中科院分区:
文献类型:
--
作者:
He Z;Wang F;Zhang J;Sen S;Pang Q;Luo S;Gwack Y;Sun Z
Transcription factor retinoid acid-related orphan receptor gamma t (RORγt) transcriptionally regulates the genes required for differentiation of T helper 17 (Th17) cells that mediate both protective and pathogenic immunity. However, little is known about the function of post-translational modifications in the regulation of RORγt activity. Mass spectrometric analysis of immunoprecipitated RORγt from Th17 cells identified multiple phosphorylation sites. Systematic mutation analysis of the identified phosphorylation sites find that phosphorylation of serine 376 (S376) enhances whereas phosphorylation of serine 484 (S484) inhibits Th17 differentiation. IKKα binds and phosphorylates RORγt at S376 but not S484. Knockdown of IKKα, dominant negative IKKα and RORγt mutants incapable of interacting with IKKα all decrease Th17 differentiation. Furthermore, nonphosophorylatable RORγt mutant (S376A) impairs whereas phosphomimetic mutant (S376E) stimulates Th17 differentiation independent of IKKα. Therefore, IKKα-dependent phosphorylation of S376 stimulated whereas IKKα-independent phosphorylation of S484 inhibited RORγt function in Th17 differentiation.
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