Stat3 activation links a C/EBPδ to myostatin pathway to stimulate loss of muscle mass.

Stat3 activation links a C/EBPδ to myostatin pathway to stimulate loss of muscle mass.
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DOI:
10.1016/j.cmet.2013.07.012
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发表时间:
2013-09-03
期刊:
影响因子:
29
通讯作者:
Mitch WE
Mitch WE
中科院分区:
生物学1区
文献类型:
--
作者:
Zhang L;Pan J;Dong Y;Tweardy DJ;Dong Y;Garibotto G;Mitch WE

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分解代谢疾病,如慢性肾病(CKD),通过不清楚的机制导致肌肉质量损失。在CKD患者的肌肉活检中,我们发现活化的Stat 3(p-Stat 3),并假设p-Stat 3启动肌肉萎缩。我们创建了肌肉特异性敲除(KO)小鼠,以防止Stat 3的激活。在这些小鼠中,在CKD或急性糖尿病模型中,体重和肌肉重量的损失受到抑制。抑制Stat 3活化的小分子产生了类似的反应,表明了翻译策略的潜力。使用C/EBPδ KO小鼠和敲低C/EBPδ或肌肉生长抑制素的C2 C12肌管,我们确定p-Stat 3通过C/EBPδ启动肌肉消耗,刺激肌肉生长抑制素,一种负性肌肉生长调节因子。C/EBPδ KO还改善了CKD小鼠的存活率。我们证实CKD患者肌肉中p-Stat 3、C/EBPδ和myostatin均升高。从p-Stat 3到C/EBPδ再到肌肉生长抑制素和肌肉萎缩的途径可以确定预防肌肉萎缩的治疗靶点。
Catabolic conditions like chronic kidney disease (CKD) cause loss of muscle mass by unclear mechanisms. In muscle biopsies from CKD patients, we found activated Stat3 (p-Stat3) and hypothesized that p-Stat3 initiates muscle wasting. We created mice with muscle-specific knockout (KO) that prevents activation of Stat3. In these mice, losses of body and muscle weights were suppressed in models of CKD or acute diabetes. A small molecule that inhibits Stat3 activation produced similar responses suggesting a potential for translation strategies. Using C/EBPδ KO mice and C2C12 myotubes with knockdown of C/EBPδ or myostatin, we determined that p-Stat3 initiates muscle wasting via C/EBPδ, stimulating myostatin, a negative muscle growth regulator. C/EBPδ KO also improved survival of CKD mice. We verified that p-Stat3, C/EBPδ and myostatin were increased in muscles of CKD patients. The pathway from p-Stat3 to C/EBPδ to myostatin and muscle wasting could identify therapeutic targets that prevent muscle wasting.
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