C‐X‐C chemokine receptor type 4 promotes tubular cell senescence and renal fibrosis through β‐catenin‐inhibited fatty acid oxidation

Author:

Wu Qinyu12,Chen Qiurong1,Xu Dan1,Wang Xiaoxu1,Ye Huiyun1,Li Xiaolong1,Xiong Yabing1,Li Jiemei1,Zhou Shan1,Miao Jinhua1,Shen Weiwei1,Liu Youhua1,Niu Hongxin3,Tang Ying2,Zhou Lili1ORCID

Affiliation:

1. State Key Laboratory of Organ Failure Research, National Clinical Research Center for Kidney Disease, Guangdong Provincial Institute of Nephrology, Guangdong Provincial Key Laboratory of Renal Failure Research, Division of Nephrology, Nanfang Hospital Southern Medical University Guangzhou China

2. Department of Nephrology The Third Affiliated Hospital of Southern Medical University Guangzhou China

3. Special Medical Service Center, Zhujiang Hospital Southern Medical University Guangzhou China

Abstract

AbstractThe prevalence of chronic kidney disease (CKD) is highly increasing. Renal fibrosis is a common pathological feature in various CKD. Previous studies showed tubular cell senescence is highly involved in the pathogenesis of renal fibrosis. However, the inducers of tubular senescence and the underlying mechanisms have not been fully investigated. C‐X‐C motif chemokine receptor 4 (CXCR4), a G‐protein‐coupled seven‐span transmembrane receptor, increases renal fibrosis and plays an important role in tubular cell injury. Whereas, whether CXCR4 could induce tubular cell senescence and the detailed mechanisms have not studied yet. In this study, we adopted adriamycin nephropathy and 5/6 nephrectomy models, and cultured tubular cell line. Overexpression or knockdown of CXCR4 was obtained by injection of related plasmids. We identified CXCR4 increased in injury tubular cells. CXCR4 was expressed predominantly in renal tubular epithelial cells and co‐localized with adipose differentiation‐related protein (ADRP) as well as the senescence‐related protein P16INK4A. Furthermore, we found overexpression of CXCR4 greatly induced the activation of β‐catenin, while knockdown of CXCR4 inhibited it. We also found that CXCR4 inhibited fatty acid oxidation and triggered lipid deposition in tubular cells. To inhibit β‐catenin by ICG‐001, an inhibitor of β‐catenin, could significantly block CXCR4‐suppressed fatty acid oxidation. Taken together, our results indicate that CXCR4 is a key mediator in tubular cell senescence and renal fibrosis. CXCR4 promotes tubular cell senescence and renal fibrosis by inducing β‐catenin and inhibiting fatty acid metabolism. Our findings provide a new theory for tubular cell injury in renal fibrosis.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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