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Exacerbation of autoimmune uveitis by obesity occurs through the melanocortin 5 receptor.
Journal of Leukocyte Biology 2019 July 10
Autoimmune uveitis is a leading cause of blindness with a complex etiology. Obesity is considered a chronic disease with a connection with autoimmune diseases through systemic inflammation. However, an obesity and autoimmune disease connection is not consistently true in rodent models of autoimmune disease. A mouse model of human autoimmune uveitis, experimental autoimmune uveitis (EAU) has been used to better understand the immunobiology of uveitis. In this study, we assessed EAU in a high-fat diet (HFD) obesity model and found that the EAU severity is significantly higher in wild-type mice, but not in HFD melanocortin 5 receptor deficient mice. We find a decrease in CD11b+ F4/80+ Ly-6Clo Ly-6G+ Mϕs, previously shown to be suppressive, and an enhancement of a Th1 response at the onset of EAU in obese mice. We further demonstrate that at recovery of EAU, obese mice lack regulatory immunity that provides protection from EAU. This report demonstrates that obesity exacerbates autoimmune uveitis and inhibits the promotion of post-EAU regulatory immunity through the melanocortin 5 receptor. The implication of this work is that obesity may contribute to the prevalence of autoimmune uveitis.
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