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Dietary Interventions Promoting Mutant Uromodulin Clearance as a Therapeutic Strategy in Preclinical Models of Autosomal Dominant Tubulointerstitial Kidney Disease [RNA-seq_WT_R186S_CR]

ABSTRACT: Missense mutations in UMOD cause autosomal dominant tubulointerstitial kidney disease (ADTKD-UMOD), a prevalent monogenic disorder caused by intracellular accumulation of mutant uromodulin. We previously showed how stimulation of autophagy through nutrient deprivation promotes the clearance of mutant uromodulin, reducing toxic aggregates and ER stress and alleviating kidney disease. We exposed 8-week old UmodR186S/+ to a 4-week progressive CR compared to ad libitum (AL) feeding in mutant and WT littermates.

ORGANISM(S): Mus musculus

PROVIDER: GSE314131 | GEO | 2026/09/04

REPOSITORIES: GEO

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Project description:Background: Uromodulin (Tamm-Horsfall) protein is secreted by the thick ascending limb into urine and crosses the basolateral membrane into the kidney interstitium and blood. Uromodulin may engage the kidney’s innate immune system with pro and anti-inflammatory effects described. Mutations in the UMOD gene are a cause of autosomal dominant tubulointerstitial kidney disease (ADTKD) due to protein misfolding and endoplasmic reticulum stress. We identified a family with a UMOD mutation (C106F) that leads to glomerular and interstitial inflammation atypical for ADTKD. Methods: To determine if the observed phenotype is due to mutant uromodulin induced changes in the innate or adaptive immune system, we developed a transgenic (tg) mouse with a homologous cysteine to phenylalanine mutation (C105F) in the UMOD gene using CRISPR-Cas9 gene editing. Results: LLC-PK1 cells expressing wt and mutant protein had increased basolateral secretion of protein compared with cells expressing wt or mutant protein alone. EM examination of mutant medium showed protein aggregates in contrast to filaments in wt medium. Immunoprecipitation of plasma uromodulin from mutant mice demonstrated aggregate formation not seen in wt mice. Tg/+ mice displayed increased F4/80+ mononuclear phagocyte (MP) and podocyte inflammasome activity at baseline. Tg/+ mice developed glomerular and interstitial matrix deposition, myofibroblast proliferation and increased Creatinine with aging. Following ischemia-reperfusion injury, tg/+ mice had no increase in inflammasome activation over baseline in contrast to wt littermates and displayed improved tubular repair and renal function at 7 days. Differential gene expression analysis by RNA sequencing of kidney MP revealed activation of the ATF4 mediated stress response pathway and genes associated with the development of tissue fibrosis. Conclusions: The C106F mutation results in glomerular and interstitial inflammatory kidney disease due to interaction of aggregated misfolded protein with mononuclear phagocytic cells resulting in ER stress response. The resulting alteration in the immune system leads to improved kidney repair following acute injury but fibrosis and chronic renal failure with aging.

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Dietary Interventions Promoting Mutant Uromodulin Clearance as a Therapeutic Strategy in Preclinical Models of Autosomal Dominant Tubulointerstitial Kidney Disease [RNA-seq_WT_R186S_CR]

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