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Helix-Loop-Helix Factor Id3 (Inhibitor of Differentiation 3): A Novel Regulator of Hyaluronan-Mediated Adipose Tissue Inflammation.

Authors:
Angelina Misiou James C Garmey Jack M Hensien Daniel B Harmon Victoria Osinsk Chantel McSkimming Melissa A Marshall Jens W Fischer Maria Grandoch Coleen A McNamara

Arterioscler Thromb Vasc Biol 2020 Dec 31:ATVBAHA120315588. Epub 2020 Dec 31.

Robert M. Berne Cardiovascular Research Center, University of Virginia, Charlottesville. (J.C.G., J.M.H., D.B.H., V.O., C.M., M.A.M., C.A.M.).

Objective: The aim of this study was to unravel mechanisms whereby deficiency of the transcription factor Id3 (inhibitor of differentiation 3) leads to metabolic dysfunction in visceral obesity. We investigated the impact of loss of Id3 on hyaluronic acid (HA) production by the 3 HAS (HA synthases; -1, -2, and -3) and on obesity-induced adipose tissue (AT) accumulation of proinflammatory B cells. Approach and Results: Male mice and respective wild-type littermate controls were fed a 60% high-fat diet for 4 weeks. An increase in inflammatory B2 cells was detected in epididymal AT. HA accumulated in epididymal AT of high-fat diet-fed mice and circulating levels of HA were elevated. mRNA expression was increased in epididymal AT of mice. Luciferase promoter assays showed that Id3 suppressed promoter activity, while loss of stimulated promoter activity. Functionally, HA strongly promoted B2 cell adhesion in the AT and on cultured vascular smooth muscle cells of mice, an effect sensitive to hyaluronidase.

Conclusions: Our data demonstrate that loss of increases expression in the epididymal AT, thereby promoting HA accumulation. In turn, elevated HA content promotes HA-dependent binding of B2 cells and an increase in the B2 cells in the AT, which contributes to AT inflammation.

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http://dx.doi.org/10.1161/ATVBAHA.120.315588DOI Listing
December 2020

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