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Dyslipidemia promotes germinal center reactions via IL-27
Heeju Ryu1, Yeonseok Chung1,*
1Laboratory of Immune Regulation, Institute of Pharmaceutical Sciences and 2BK21 Plus program, College of Pharmacy, Seoul National University, Seoul, Republic of Korea
Cardiovascular disease such as atherosclerosis is caused by imbalanced lipid metabolism and represents a leading cause of death worldwide. Epidemiological studies show that patients with systemic autoimmune diseases exhibit a higher incidence of atherosclerosis. Conversely, hyperlipidemia has been known to accelerate the incidence of autoimmune diseases in humans and in animal models. However, there is a considerable gap in our understanding of how atherosclerosis impacts the development of the autoimmunity in humans, and vice versa. The atherosclerosis-related autoimmune diseases include psoriasis, rheumatoid arthritis, systemic lupus erythematosus (SLE) and diabetes mellitus. By using animal models of atherosclerosis and SLE, we have recently demonstrated that hyperlipidemia significantly accelerates the development of autoantibodies, by inducing autoimmune follicular helper T (TFH) cells. Mechanistic studies have identified that hyperlipidemia induces IL-27 production in a TLR4-dependent manner, likely via downregulating LXR expression in dendritic cells. In this case, mice lacking IL-27 do not develop enhanced antibody responses. Thus it is noted that these findings propose a mechanistic insight responsible for the tight association between cardiovascular diseases and SLE in humans.
Abstract, Accepted Manuscript [Submitted on July 24, 2018, Accepted on July 24, 2018]
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