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• W3095492023 abstract "ABSTRACT Alport syndrome (AS) is a rare disease of the glomerular basement membrane type IV collagen causing progressive renal failure. We reported increased accumulation of low-density lipoprotein (LDL) receptor (LDLR) and subsequent LDL cholesterol (LDL-C) uptake in renal tubular epithelial cells (TEC) in Alport mice, but the mechanisms regulating LDLR stability and function remain unknown. Here, we show that a selective β 2 -Adrenoceptor (β 2 AR) agonist, salbutamol, decreased LDLR levels and LDL-C uptake in Alport kidneys accompanied with reduced albuminuria and improved cardiac systolic and diastolic function. Similarly, salbutamol decreased LDL-C uptake in HK2 and HEK293 human renal epithelial cell lines, in smooth muscle cells from an X-linked hereditary nephropathy dog model (a large animal model of AS), and in TECs differentiated from AS patient-derived iPSCs. We show that the Rac1/Cdc42 guanine nucleotide exchange factor β1Pix blocked β 2 AR-induced LDLR degradation and, hence, increased LDL-C uptake. β1Pix also abrogated ubiquitination and degradation of LDLR induced by the inducible degrader of the LDLR (IDOL), an E3 ubiquitin ligase that promotes lysosomal LDLR ubiquitination and degradation. We identify a multimolecular complex comprised of βPix, IDOL, and LDLR and demonstrate that βPix counteracts β 2 AR-mediated LDLR degradation by sequestering IDOL. Our findings show βPix acts as a significant post-transcriptional regulator of IDOL-mediated LDLR degradation and identify β 2 AR activation as a potential treatment for Alport pathology." @default.
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• W3095492023 date "2020-11-07" @default.
• W3095492023 modified "2023-09-27" @default.
• W3095492023 title "βPix sequesters IDOL and prevents LDL receptor degradation through a β2AR-regulated signaling pathway in Alport Syndrome" @default.
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• W3095492023 doi "https://doi.org/10.1101/2020.11.06.372292" @default.
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