Resolvin D1 and resolvin D2 govern local inflammatory tone in obese fat

J Clària, J Dalli, S Yacoubian, F Gao… - The Journal of …, 2012 - journals.aai.org
J Clària, J Dalli, S Yacoubian, F Gao, CN Serhan
The Journal of Immunology, 2012journals.aai.org
The unprecedented increase in the prevalence of obesity and obesity-related disorders is
causally linked to a chronic state of low-grade inflammation in adipose tissue. Timely
resolution of inflammation and return of this tissue to homeostasis are key to reducing
obesity-induced metabolic dysfunctions. In this study, with inflamed adipose, we investigated
the biosynthesis, conversion, and actions of Resolvins D1 (RvD1, 7S, 8R, 17S-trihydroxy-4Z,
9E, 11E, 13Z, 15E, 19Z-docosahexaenoic acid) and D2 (RvD2, 7S, 16R, 17S-trihydroxy-4Z …
Abstract
The unprecedented increase in the prevalence of obesity and obesity-related disorders is causally linked to a chronic state of low-grade inflammation in adipose tissue. Timely resolution of inflammation and return of this tissue to homeostasis are key to reducing obesity-induced metabolic dysfunctions. In this study, with inflamed adipose, we investigated the biosynthesis, conversion, and actions of Resolvins D1 (RvD1, 7S, 8R, 17S-trihydroxy-4Z, 9E, 11E, 13Z, 15E, 19Z-docosahexaenoic acid) and D2 (RvD2, 7S, 16R, 17S-trihydroxy-4Z, 8E, 10Z, 12E, 14E, 19Z-docosahexaenoic acid), potent anti-inflammatory and proresolving lipid mediators (LMs), and their ability to regulate monocyte interactions with adipocytes. Lipid mediator-metabololipidomics identified RvD1 and RvD2 from endogenous sources in human and mouse adipose tissues. We also identified proresolving receptors (ie, ALX/FPR2, ChemR23, and GPR32) in these tissues. Compared with lean tissue, obese adipose showed a deficit of these endogenous anti-inflammatory signals. With inflamed obese adipose tissue, RvD1 and RvD2 each rescued impaired expression and secretion of adiponectin in a time-and concentration-dependent manner as well as decreasing proinflammatory adipokine production including leptin, TNF-α, IL-6, and IL-1β. RvD1 and RvD2 each reduced MCP-1 and leukotriene B 4-stimulated monocyte adhesion to adipocytes and their transadipose migration. Adipose tissue rapidly converted both resolvins (Rvs) to novel oxo-Rvs. RvD2 was enzymatically converted to 7-oxo-RvD2 as its major metabolic route that retained adipose-directed RvD2 actions. These results indicate, in adipose, D-series Rvs (RvD1 and RvD2) are potent proresolving mediators that counteract both local adipokine production and monocyte accumulation in obesity-induced adipose inflammation.
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