Excess dietary carbohydrate affects mitochondrial integrity as observed in brown adipose tissue.

Excess dietary carbohydrate affects mitochondrial integrity as observed in brown adipose tissue.
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DOI:
10.1016/j.celrep.2021.109488
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发表时间:
2021-08-03
期刊:
影响因子:
8.8
通讯作者:
Wu N
Wu N
中科院分区:
生物学1区
文献类型:
--
作者:
Waldhart AN;Muhire B;Johnson B;Pettinga D;Madaj ZB;Wolfrum E;Dykstra H;Wegert V;Pospisilik JA;Han X;Wu N

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Hypertension影响全球超过4亿人。有害的健康影响在组织水平上得到了很好的研究,但在细胞器水平上的体内影响却知之甚少。为了建立这样的体内模型,我们使用缺乏TXNIP的小鼠,TXNIP是葡萄糖摄取的负调节剂。检查棕色脂肪组织中的线粒体功能,我们发现TXNIP KO小鼠的膜脂质中多不饱和脂肪酸(PUFA)含量较低,这会影响线粒体完整性和电子传递链效率,最终导致线粒体热输出降低。这种表型可以通过生酮饮食来挽救,证实了这种模型的有用性,并突出了过量葡萄糖流入引起的早期细胞损伤的一个方面。Waldhart等人的体内研究表明,过量的葡萄糖通过改变结构脂质的酰基链组成对线粒体功能产生有害影响。
Hyperglycemia affects over 400 million individuals worldwide. The detrimental health effects are well studied at the tissue level, but the in vivo effects at the organelle level are poorly understood. To establish such an in vivo model, we used mice lacking TXNIP, a negative regulator of glucose uptake. Examining mitochondrial function in brown adipose tissue, we find that TXNIP KO mice have a lower content of polyunsaturated fatty acids (PUFAs) in their membrane lipids, which affects mitochondrial integrity and electron transport chain efficiency and ultimately results in lower mitochondrial heat output. This phenotype can be rescued by a ketogenic diet, confirming the usefulness of this model and highlighting one facet of early cellular damage caused by excess glucose influx. Waldhart et al. show in vivo evidence that excess glucose has detrimental effects on mitochondrial function by changing the acyl-chain composition of structural lipids.
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