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HOXC10 抑制棕色化以维持白色脂肪细胞的特征。

HOXC10 Suppresses Browning to Maintain White Adipocyte Identity.

机构信息

Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore.

Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore

出版信息

Diabetes. 2021 Aug;70(8):1654-1663. doi: 10.2337/db21-0114. Epub 2021 May 14.

DOI:10.2337/db21-0114
PMID:33990396
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8385616/
Abstract

Promoting beige adipocyte development within white adipose tissue (WAT) is a potential therapeutic approach to staunch the current obesity epidemic. Previously, we identified homeobox-containing transcription factor HOXC10 as a suppressor of browning in subcutaneous WAT. Here, we provide evidence for the physiological role of HOXC10 in regulating WAT thermogenesis. Analysis of an adipose-specific HOXC10 knockout mouse line with no detectable HOXC10 in mature adipocytes revealed spontaneous subcutaneous WAT browning, increased expression of genes involved in browning, increased basal rectal temperature, enhanced cold tolerance, and improved glucose homeostasis. These phenotypes were further exacerbated by exposure to cold or a β-adrenergic stimulant. Mechanistically, cold and β-adrenergic exposure led to reduced HOXC10 protein level without affecting its mRNA level. Cold exposure induced cAMP-dependent protein kinase-dependent proteasome-mediated degradation of HOXC10 in cultured adipocytes, and shotgun proteomics approach identified KCTD2, 5, and 17 as potential E3 ligases regulating HOXC10 proteasomal degradation. Collectively, these data demonstrate that HOXC10 is a gatekeeper of WAT identity, and targeting HOXC10 could be a plausible therapeutic strategy to unlock WAT thermogenic potentials.

摘要

促进白色脂肪组织(WAT)中米色脂肪细胞的发育是遏制当前肥胖流行的一种潜在治疗方法。此前,我们鉴定了同源盒转录因子 HOXC10 是皮下 WAT 棕色化的抑制剂。在这里,我们为 HOXC10 在调节 WAT 产热中的生理作用提供了证据。分析脂肪组织特异性 HOXC10 敲除小鼠品系,在成熟脂肪细胞中检测不到 HOXC10,结果显示自发性皮下 WAT 棕色化,参与棕色化的基因表达增加,基础直肠温度升高,耐寒性增强,葡萄糖稳态改善。这些表型在暴露于寒冷或β-肾上腺素能刺激剂时进一步加剧。从机制上讲,寒冷和β-肾上腺素能暴露导致 HOXC10 蛋白水平降低,而不影响其 mRNA 水平。寒冷暴露诱导培养脂肪细胞中 cAMP 依赖性蛋白激酶依赖性蛋白酶体介导的 HOXC10 降解,而 shotgun 蛋白质组学方法鉴定出 KCTD2、5 和 17 是调节 HOXC10 蛋白酶体降解的潜在 E3 连接酶。总之,这些数据表明 HOXC10 是 WAT 特性的守门员,靶向 HOXC10 可能是一种合理的治疗策略,可释放 WAT 的产热潜力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0178/8385616/e65bc1f768b4/db210114f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0178/8385616/67f853c69765/db210114f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0178/8385616/d0c54a464811/db210114f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0178/8385616/4026cea863f9/db210114f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0178/8385616/65381d0e8c37/db210114f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0178/8385616/e65bc1f768b4/db210114f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0178/8385616/67f853c69765/db210114f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0178/8385616/d0c54a464811/db210114f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0178/8385616/4026cea863f9/db210114f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0178/8385616/65381d0e8c37/db210114f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0178/8385616/e65bc1f768b4/db210114f5.jpg

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