mTORC2 protects the heart from high-fat diet-induced cardiomyopathy through mitochondrial fission in Drosophila.

mTORC2 protects the heart from high-fat diet-induced cardiomyopathy through mitochondrial fission in Drosophila.
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MTORC2通过果蝇的线粒体裂变保护心脏免受高脂饮食诱导的心肌病。

DOI:
10.3389/fcell.2022.866210
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发表时间:
2022
影响因子:
5.5
通讯作者:
--
中科院分区:
生物学2区
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高脂饮食(HFD)引起的肥胖已成为心血管疾病发生的主要危险因素,但其潜在机制仍知之甚少。在这里,我们使用果蝇作为模型来研究 mTORC2 在 HFD 诱导的线粒体裂变和心脏功能障碍中的作用。我们发现 mTORC2 亚基 rictor 的敲低会阻止 HFD 诱导的线粒体断裂和 Drp1 募集。 HFD 治疗下 rictor 的降低进一步损害心脏收缩功能。令人惊讶的是,mTORC2 主要效应子 Akt 的敲低并不影响 HFD 诱导的线粒体裂变。与 mTORC2 抑制类似,Drp1 的敲除可阻止 HFD 诱导的线粒体断裂并诱导收缩缺陷。此外,在 rictor 敲低果蝇中,Drp1 的过度表达恢复了 HFD 诱导的线粒体断裂。因此,我们发现了 mTORC2 通过 Drp1 依赖性线粒体裂变保护心脏免受 HFD 治疗的新功能。
High-fat diet (HFD)-induced obesity has become the major risk factor for the development of cardiovascular diseases, but the underlying mechanisms remain poorly understood. Here, we use Drosophila as a model to study the role of mTORC2 in HFD-induced mitochondrial fission and cardiac dysfunction. We find that knockdown of mTORC2 subunit rictor blocks HFD-induced mitochondrial fragmentation and Drp1 recruitment. Knockdown of rictor further impairs cardiac contractile function under HFD treatment. Surprisingly, knockdown of Akt, the major effector of mTORC2, did not affect HFD-induced mitochondrial fission. Similar to mTORC2 inhibition, knockdown of Drp1 blocks HFD-induced mitochondrial fragmentation and induces contractile defects. Furthermore, overexpression of Drp1 restored HFD-induced mitochondrial fragmentation in rictor knockdown flies. Thus, we uncover a novel function of mTORC2 in protecting the heart from HFD treatment through Drp1-dependent mitochondrial fission.
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