251. TGFBI remodels adipose metabolism by regulating the Notch-1 signaling pathway
- Author
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Ju-Ock Nam, Seul Gi Lee, Seon Min Woo, Seung Un Seo, Ha-Jeong Kim, David D. Schlaepfer, In-San Kim, Hee-Sae Park, and Taeg Kyu Kwon
- Abstract
Extracellular matrix proteins are associated with metabolically healthy adipose tissue and regulate inflammation, fibrosis, angiogenesis, and subsequent metabolic deterioration. In this study, we demonstrated that transforming growth factor-beta (TGFBI), an extracellular matrix (ECM) component, plays an important role in adipose metabolism and browning during high-fat diet-induced obesity. TGFBI KO mice were resistant to adipose tissue hypertrophy, liver steatosis, and insulin resistance. Furthermore, adipose tissue from TGFBI KO mice presented a large population of CD11b+ macrophages, which control adipokine secretion through paracrine mechanisms. Mechanistically, we showed that inhibiting TGFBI-stimulated release of adipsin by Notch-1-dependent signaling resulted in adipocytes browning. TGFBI was physiologically bound to Notch-1 and stimulated its activation in adipocytes. Our findings revealed a novel protective effect of TGFBI deficiency in obesity that is realized via the activation of the Notch-1 signaling pathway.
- Published
- 2022
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