An OGT-STAT5 Axis in Regulatory T Cells Controls Energy and Iron Metabolism.

An OGT-STAT5 Axis in Regulatory T Cells Controls Energy and Iron Metabolism.
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DOI:
10.3389/fimmu.2022.874863
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发表时间:
2022
影响因子:
7.3
通讯作者:
Ruan, Hai-Bin
Ruan, Hai-Bin
中科院分区:
医学2区
文献类型:
--
作者:
Zhang, Zengdi;Salgado, Oscar C.;Liu, Bing;Moazzami, Zahra;Hogquist, Kristin A.;Farrar, Michael A.;Ruan, Hai-Bin

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免疫抑制调节性T细胞(Treg)在脂肪组织稳态和全身代谢中发挥着新的作用。然而,Treg细胞在应对致肥性损伤中的代谢调控和效应机制尚不完全清楚。我们之前已经确定了O-linked n -乙酰氨基葡萄糖(O-GlcNAc)信号在维持Treg细胞身份和促进Treg抑制功能中不可或缺的作用,通过STAT5 o - glcn酰化和激活。在这里,我们研究了O-GlcNAc转移酶(OGT)-STAT5轴在驱动Treg细胞代谢稳态的免疫调节功能中的作用。Treg细胞特异性OGT缺乏使小鼠更容易受到高脂肪饮食(HFD)诱导的肥胖和胰岛素抵抗的影响。相反,Treg细胞中的组成型STAT5激活在高脂肪喂养时可以防止脂肪组织扩张和葡萄糖和胰岛素代谢受损,部分原因是通过抑制脂肪脂质摄取和重新分配全身铁储存。Treg细胞功能可以通过靶向OGT-STAT5轴来增强,以对抗肥胖和相关的代谢紊乱。
The immunosuppressive regulatory T (Treg) cells exert emerging effects on adipose tissue homeostasis and systemic metabolism. However, the metabolic regulation and effector mechanisms of Treg cells in coping with obesogenic insults are not fully understood. We have previously established an indispensable role of the O-linked N-Acetylglucosamine (O-GlcNAc) signaling in maintaining Treg cell identity and promoting Treg suppressor function, via STAT5 O-GlcNAcylation and activation. Here, we investigate the O-GlcNAc transferase (OGT)-STAT5 axis in driving the immunomodulatory function of Treg cells for metabolic homeostasis. Treg cell-specific OGT deficiency renders mice more vulnerable to high-fat diet (HFD)-induced adiposity and insulin resistance. Conversely, constitutive STAT5 activation in Treg cells confers protection against adipose tissue expansion and impaired glucose and insulin metabolism upon HFD feeding, in part by suppressing adipose lipid uptake and redistributing systemic iron storage. Treg cell function can be augmented by targeting the OGT-STAT5 axis to combat obesity and related metabolic disorders.
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