Nat Metab:肠道MYC调节肥胖相关的代谢功能紊乱

2021-07-07 xiaozeng MedSci原创

非酒精性脂肪性肝病(NAFLD)表现为在没有大量饮酒的情况下肝脏中出现大量的脂质异位沉积,其目前已成为最常见的慢性和进行性肝病。

非酒精性脂肪性肝病(NAFLD)表现为在没有大量饮酒的情况下肝脏中出现大量的脂质异位沉积,其目前已成为最常见的慢性和进行性肝病。NAFLD的全球患病率约为24%。

NAFLD,尤其是更晚期的非酒精性脂肪性肝炎(NASH),可最终发展为肝硬化和肝细胞癌等终末期肝病,并将在未来十年左右取代病毒性肝炎成为肝移植的主要原因。尽管该疾病的发病率逐年上升,但目前尚未有批准的任何药物用于治疗NAFLD。

MYC由原癌基因Myc编码,是一种高度多效性的转录因子,其对细胞增殖、代谢、血管生成、细胞凋亡、粘附和分化具有广泛的影响。MYC的失调常见于各种癌症中。近年来,肠道已被认为是参与脂质和葡萄糖代谢的中枢器官。然而,目前尚不清楚肠道中MYC对代谢疾病的影响。

在肥胖人群和小鼠模型的肠道中MYC的表达上调

该研究揭示了肠道MYC能够调节全身代谢。研究人员发现,在肥胖个体的回肠活检中MYC的表达水平升高,且与病人的体重指数呈正相关。在小鼠模型中发现,肠道特异性MYC表达水平的减少可改善高脂饮食诱导的肥胖、胰岛素抵抗、肝脂肪变性和脂肪性肝炎。

相关调控示意图

机制研究显示,肠道中MYC的表达水平减少会促进GLP-1(胰高血糖素样肽-1)的产生和分泌。此外,研究人员鉴定Cers4为MYC的靶基因。进一步的研究显示,MYC抑制剂10058-F4对于高脂饮食诱导的代谢紊乱具有有益的作用,且能够提高血清中GLP-1的水平并降低神经酰胺水平。


总而言之,该研究结果揭示,肠道MYC或可作为代谢性疾病(包括非酒精性脂肪肝病和非酒精性脂肪性肝炎)的潜在药物靶点。


原始出处:

Luo, Y., Yang, S., Wu, X. et al. Intestinal MYC modulates obesity-related metabolic dysfunction. Nat Metab (01 July 2021).

 

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    2022-05-15 guojianrong
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    2021-11-30 liye789132251
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    2021-07-11 一闲
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    2021-07-08 guihongzh
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    2021-07-07 ms3000002052890081

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    2021-07-07 ms7000001447025114

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JAMA Netw Open: 想要减肥效果好,那就在10点前入睡吧!

睡的晚,会变胖,中午补觉也没用!

Pediatric Obesity:过度的电子屏幕时间与青春期前的肥胖有关

每多花一个小时看或流媒体电视、YouTube 视频、视频游戏、视频聊天和发短信,一年后体重增加的风险就会增加。

柳叶刀全新报告我国近年体重指数与肥胖结果

自20世纪80年代初以来,我国成年人的平均体重指数(BMI)和肥胖症一直在稳步增长。然而,在全国、区域或某些人口亚群中,对近期趋势尚无可靠评估。

BMJ子刊:肥胖症患者的数量持续上升,与久坐和饮食有关

英国肥胖症患者的数量继续上升,严重和复杂的肥胖症(身体质量指数(BMI)≥40kg/m2)从1993年占总人口的不到1%增加到2017年的近4%。

Nature:肥胖真的引起脱发!科学家找到引起脱发的关键干细胞机制

作为生长毛发的微型上皮器官,毛囊随着衰老而变小,毛囊干细胞(HFSCs)耗竭而引起脱发。每一个毛囊内几乎均存在一群毛囊干细胞,这些干细胞会分化形成毛发。