Aryl Hydrocarbon Receptor Deficiency Attenuates Oxidative Stress-Related Mesangial Cell Activation and Macrophage Infiltration and Extracellular Matrix Accumulation in Diabetic Nephropathy

作者：Lee Wen Jane; Liu Shing Hwa; Chiang Chih Kang; Lin Shih Yi; Liang Kae Woei; Chen Cheng Hsu; Tien Hsing Ru; Chen Pei Hsuan; Wu Jen Pey; Tsai Yi Ching; Lai De Wei; Chang Yi Chieh; Sheu Wayne Huey Herng^*; Sheu Meei Ling^*

来源：Antioxidants and Redox Signaling, 2016, 24(4): 217-231.

DOI：10.1089/ars.2015.6310

Aims: Activation of glomerular mesangial cells (MCs) and functional changes of renal tubular cells are due to metabolic abnormalities, oxidative stress, and matrix accumulation in the diabetic nephropathy (DN). Aryl hydrocarbon receptor (AhR) activation has been implicated in DN. In this study, we investigated the role of AhR in the pathophysiological processes of DN using AhR knockout (AhRKO) and pharmacological inhibitor a-naphthoflavone mouse models. Results: The increased blood glucose, glucose intolerance, MC activation, macrophage infiltration, and extracellular matrix (ECM) accumulation were significantly attenuated in AhRKO mice with diabetic inducer streptozotocin (STZ) treatment. AhR deficiency by genetic knockout or pharmacological inhibition also decreased the induction of cyclooxygenase-2 (COX-2)/prostaglandin E-2 (PGE(2)), lipid peroxidation, oxidative stress, NADPH oxidase activity, and N-epsilon-carboxymethyllysine (CML, a major advanced glycation end product) in STZ-induced diabetic mice. CML showed remarkably increased AhR/COX-2 DNA-binding activity, protein-DNA interactions, gene regulation, and ECM formation in MCs and renal proximal tubular cells, which could be reversed by siRNA-AhR transfection. CML-increased AhR nuclear translocation and biological activity in MCs and renal proximal tubular cells could also be effectively attenuated by antioxidants. Innovation: We elucidate for the first time that AhR plays an important role in MC activation, macrophage infiltration, and ECM accumulation in DN conferred by oxidative stress. Conclusions: AhR-regulated COX-2/PGE(2) expression and ECM deposition through oxidative stress cascade is involved in the CML-triggered MC activation and macrophage infiltration. These findings suggest new insights into the development of therapeutic approaches to reduce diabetic microvascular complications.

• 出版日期2016-2-1
• 单位中国医科大学