circARF3 Alleviates Mitophagy-Mediated Inflammation by Targeting miR-103/TRAF3 in Mouse Adipose Tissue

circARF3 Alleviates Mitophagy-Mediated Inflammation by Targeting miR-103/TRAF3 in Mouse Adipose Tissue
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circARF3 通过靶向小鼠脂肪组织中的 miR-103/TRAF3 减轻线粒体自噬介导的炎症

DOI:
10.1016/j.omtn.2018.11.014
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发表时间:
2018-12
影响因子:
8.8
通讯作者:
Sun Chao
Sun Chao
中科院分区:
医学1区
文献类型:
--
作者:
Zhang Zhenzhen;Zhang Tiantian;Feng Ruonan;Huang Hongtao;Xia Tianyu;Sun Chao

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脂肪炎症是肥胖相关代谢紊乱的重要原因,包括胰岛素抵抗和高血压。在这里,我们研究了一种环状RNA (circRNA),我们称之为circARF3 (adp -核糖基化因子3),作为内源性miR-103海绵,通过促进线粒体自噬来缓解脂肪炎症。另一方面,miR-103通过抑制线粒体自噬加重炎症,表明miR-103是脂肪炎症的正调节因子。此外,我们发现肿瘤坏死因子受体相关因子3 (TRAF3)作为miR-103的下游靶点,介导miR-103在脂肪炎症中的功能。过表达TRAF3可通过加速线粒体自噬来减弱mir -103诱导的炎症。此外,我们发现circARF3阻断了miR-103的作用,从而导致TRAF3表达的增加。TRAF3抑制核因子κB (NF-κB)信号通路,增强线粒体自噬,最终抑制NLRP3炎性体活化。我们的数据显示circARF3作为内源性miR-103海绵,在体外和体内抑制线粒体自噬介导的脂肪炎症。这些发现揭示了脂肪炎症的一种新的调控途径,它由circARF3、miR-103和TRAF3组成。这项研究可以为我们的知识提供有用的补充,因为它为预防肥胖疾病中的脂肪炎症提供了一种新的策略。
Adipose inflammation is an important cause for obesity-associated metabolic disorders, including insulin resistance and hypertension. Here we investigated that a circular RNA (circRNA), which we termed circARF3 (ADP-ribosylation factor 3), acts as an endogenous miR-103 sponge to alleviate adipose inflammation by promoting mitophagy. On the other hand, miR-103 aggravated inflammation by inhibiting mitophagy, revealing that miR-103 acts as a positive regulator of adipose inflammation. Furthermore, we found that tumor necrosis factor receptor-associated factor 3 (TRAF3), as a miR-103 downstream target, mediates the functions of miR-103 in adipose inflammation. Overexpressing TRAF3 attenuated miR-103-induced inflammation by accelerating mitophagy. Moreover, we identified that circARF3 blocked miR-103 effects, which resulted in an increase in TRAF3 expression. TRAF3 restrained the nuclear factor κB (NF-κB)-signaling pathway, heightened mitophagy, and suppressed NLRP3 inflammasome activation ultimately. Our data showed that circARF3 acts as an endogenous miR-103 sponge to inhibit mitophagy-mediated adipose inflammation bothin vitroandin vivo. These findings disclose a new regulatory pathway for adipose inflammation, which consists of circARF3, miR-103, and TRAF3. This study can be a useful addition to our knowledge, as it provides a new strategy for the prevention of adipose inflammation in obesity disorder.
αMSH通过减少FOXOS转录并阻止小鼠的Akt/JNK途径来抑制脂肪炎症。
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