Ankrd2 is a modulator of NF-κB-mediated inflammatory responses during muscle differentiation.

Ankrd2 is a modulator of NF-κB-mediated inflammatory responses during muscle differentiation.
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DOI:
10.1038/cddis.2013.525
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发表时间:
2014-01-16
影响因子:
9
通讯作者:
--
中科院分区:
生物学1区
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骨骼肌的适应性反应调节肌节蛋白Ankrd 2的核穿梭,该蛋白可以通过与结构蛋白和调节蛋白相互作用将不同的刺激转化为特定的适应。在对Ankrd 2敲除或过表达的原代增殖或分化成肌细胞的全基因组表达研究中,我们发现Ankrd 2水平与促炎基因表达之间呈负相关,并通过与NF-κB阻遏物亚基p50的直接相互作用将Ankrd 2鉴定为炎症反应的有效阻遏物。特别是,我们鉴定了Gsk 3 β作为p50/Ankrd 2阻遏体二聚体的一个新的直接靶点,并发现Ankrd 2对p50的募集依赖于Akt 2介导的Ankrd 2在肌源性分化过程中氧化应激时的磷酸化。令人惊讶的是,Ankrd 2在慢肌中的缺失对与慢肌程序相关的细胞因子和关键钙调神经磷酸酶依赖性基因的表达产生了负面影响。因此,我们的研究结果支持了一个模型,其中Ankrd 2蛋白和磷酸化水平的改变调节肌肉中生理和病理炎症反应之间的平衡。
Adaptive responses of skeletal muscle regulate the nuclear shuttling of the sarcomeric protein Ankrd2 that can transduce different stimuli into specific adaptations by interacting with both structural and regulatory proteins. In a genome-wide expression study on Ankrd2-knockout or -overexpressing primary proliferating or differentiating myoblasts, we found an inverse correlation between Ankrd2 levels and the expression of proinflammatory genes and identified Ankrd2 as a potent repressor of inflammatory responses through direct interaction with the NF-κB repressor subunit p50. In particular, we identified Gsk3β as a novel direct target of the p50/Ankrd2 repressosome dimer and found that the recruitment of p50 by Ankrd2 is dependent on Akt2-mediated phosphorylation of Ankrd2 upon oxidative stress during myogenic differentiation. Surprisingly, the absence of Ankrd2 in slow muscle negatively affected the expression of cytokines and key calcineurin-dependent genes associated with the slow-twitch muscle program. Thus, our findings support a model in which alterations in Ankrd2 protein and phosphorylation levels modulate the balance between physiological and pathological inflammatory responses in muscle.
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