Program in Molecular Medicine
Adipose Tissue; Animals; Disease Models, Animal; Humans; Insulin Resistance; Mice; Tumor Necrosis Factor-alpha
Cellular and Molecular Physiology | Endocrine System Diseases | Endocrinology
Diet-induced obesity (DIO) predisposes individuals to insulin resistance, and adipose tissue has a major role in the disease. Insulin resistance can be induced in cultured adipocytes by a variety of treatments, but what aspects of the in vivo responses are captured by these models remains unknown. We use global RNA sequencing to investigate changes induced by TNF-alpha, hypoxia, dexamethasone, high insulin, and a combination of TNF-alpha and hypoxia, comparing the results to the changes in white adipose tissue from DIO mice. We found that different in vitro models capture distinct features of DIO adipose insulin resistance, and a combined treatment of TNF-alpha and hypoxia is most able to mimic the in vivo changes. Using genome-wide DNase I hypersensitivity followed by sequencing, we further examined the transcriptional regulation of TNF-alpha-induced insulin resistance, and we found that C/EPBbeta is a potential key regulator of adipose insulin resistance.
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Citation: Cell Rep. 2013 Oct 17;5(1):259-70. doi: 10.1016/j.celrep.2013.08.039. Epub 2013 Oct 3. Link to article on publisher's site
Lo, Kinyui Alice; Labadorf, Adam; Kennedy, Norman J.; Han, Myoung Souk; Yap, Yoon Sing; Matthews, Bryan; Xin, Xiaofeng; Sun, Lei; Davis, Roger J.; Lodish, Harvey F.; and Fraenkel, Ernest, "Analysis of in vitro insulin-resistance models and their physiological relevance to in vivo diet-induced adipose insulin resistance" (2013). University of Massachusetts Medical School Faculty Publications. 773.
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