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Toxinsに論文が受理されました。(尿毒素インドキシル硫酸が誘発する脂肪組織炎症の分子機構に関する研究)

2020/08/03

Tanaka S*, Watanabe H*#, Nakano T*, Imafuku T*, Kato H, Tokumaru K, Arimura N, Enoki Y, Maeda H, Tanaka T, Matsushita M, Fukagawa F, Maruyama T*#. Indoxyl sulfate contributes to adipose tissue inflammation through the activation of NADPH oxidase. Toxins (in press) *equal contribution and #equal corresponding author

Abstract: Adipose tissue inflammation appears to be a risk factor for the progression of chronic kidney disease (CKD), but the effect of CKD on adipose tissue inflammation is poorly understood. The purpose of this study was to clarify the involvement of uremic toxins (indoxyl sulfate (IS), 3-indoleacetic acid, p-cresyl sulfate and kynurenic acid) on CKD-induced adipose tissue inflammation. IS induces monocyte chemoattractant protein-1 (MCP-1) expression and reactive oxygen species (ROS) production in the differentiated 3T3L-1 adipocyte. An organic anion transporter (OAT) inhibitor, an NADPH oxidase inhibitor or an antioxidant suppresses the IS-induced MCP-1 expression and ROS production, suggesting the OAT/NADPH oxidase/ROS pathway is involved in the action of IS. Co-culturing 3T3L-1 adipocytes and mouse macrophage cells showed incubating adipocytes with IS increased macrophage infiltration. An IS-overload in healthy mice increased IS levels, oxidative stress and MCP-1 expression in epididymal adipose tissue compared to unloaded mice. Using 5/6-nephrectomized mice, the administration of AST-120 suppressed oxidative stress and the expression of MCP-1, F4/80 and TNF-α in epididymal adipose tissue. These collective data suggest IS could be a therapeutic target for the CKD-related inflammatory response in adipose tissue and that AST-120 could be useful for the treatment of IS-induced adipose tissue inflammation.