miR-30a Remodels Subcutaneous Adipose Tissue Inflammation to Improve Insulin Sensitivity in Obesity

Eun-Hee Koh, Natasha Chernis, Pradip K Saha, Liuling Xiao, David A Bader, Bokai Zhu, Kimal Rajapakshe, Mark P Hamilton, Xia Liu, Dimuthu Perera, Xi Chen, Brian York, Michael Trauner, Cristian Coarfa, Mandeep Bajaj, David D Moore, Tuo Deng, Sean E McGuire, Sean M Hartig

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

Chronic inflammation accompanies obesity and limits subcutaneous white adipose tissue (WAT) expandability, accelerating the development of insulin resistance and type 2 diabetes mellitus (T2DM). MicroRNAs influence expression of many metabolic genes in fat cells, but physiological roles in WAT remain poorly characterized. Here, we report expression of the microRNA miR-30a in subcutaneous WAT corresponds with insulin sensitivity in obese mice and humans. To examine the hypothesis that restoration of miR-30a expression in WAT improves insulin sensitivity, we injected adenovirus (Adv) expressing miR-30a into the subcutaneous fat pad of diabetic mice. Exogenous miR-30a expression in the subcutaneous WAT depot of obese mice coupled improved insulin sensitivity and increased energy expenditure with decreased ectopic fat deposition in the liver and reduced WAT inflammation. High throughput proteomic profiling and RNA-Seq suggested miR-30a targets the transcription factor STAT1 to limit the actions of the pro-inflammatory cytokine interferon-gamma (IFNγ), that would otherwise restrict WAT expansion and decrease insulin sensitivity. We further demonstrated miR-30a opposes the actions of IFNγ, suggesting an important role for miR-30a in defending adipocytes against pro-inflammatory cytokines that reduce peripheral insulin sensitivity. Together, our data identify a critical molecular signaling axis, elements of which are involved in uncoupling obesity from metabolic dysfunction.

Original languageEnglish (US)
JournalDiabetes
DOIs
StateE-pub ahead of print - Jul 12 2018

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