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BRCC36 regulates β-catenin ubiquitination to alleviate vascular calcification in chronic kidney disease. | LitMetric
Background : The prevalence of vascular calcification (VC) in chronic kidney disease (CKD) patients remains substantial, but currently, there are no effective pharmaceutical therapies available. BRCA1/BRCA2-containing complex subunit 36 (BRCC36) has been implicated in osteoblast osteogenic conversion; however, its specific role in VC remains to be fully elucidated. The aim of this study was to investigate the role and underlying mechanisms of BRCC36 in VC.Methods : The association between BRCC36 expression and VC was examined in radial arteries from patients with CKD, high-adenine-induced CKD mice, and vascular smooth muscle cells (VSMCs). Western blotting, real-time polymerase chain reaction, immunofluorescence, and immunohistochemistry were used to analyse gene expression. Gain- and loss-of-function experiments were performed to comprehensively investigate the effects of BRCC36 on VC. Coimmunoprecipitation and TOPFlash luciferase assays were utilized to further investigate the regulatory effects of BRCC36 on the Wnt/β-catenin pathway.Results : BRCC36 expression was downregulated in human calcified radial arteries, calcified aortas from CKD mice, and calcified VSMCs. VSMC-specific BRCC36 overexpression alleviated calcium deposition in the vasculature, whereas BRCC36 depletion aggravated VC progression. Furthermore, BRCC36 inhibited the osteogenic differentiation of VSMCs in vitro. Rescue experiments revealed that BRCC36 exerts the protective effects on VC partly by regulating the Wnt/β-catenin signalling pathway. Mechanistically, BRCC36 inhibited the Wnt/β-catenin pathway by decreasing the K63-linked ubiquitination of β-catenin. Additionally, pioglitazone attenuated VC partly through upregulating BRCC36 expression.Conclusions : Our research results emphasize the critical role of the BRCC36-β-catenin axis in VC, suggesting that BRCC36 or β-catenin may be promising therapeutic targets to prevent the progression of VC in CKD patients.
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