ADPKDにおけるOgtの標的化は、代謝再構築と腎嚢胞形成を軽減し、生存期間を延長する

Aberrant cell metabolism drives autosomal dominant polycystic kidney disease (ADPKD). O-GlcNAcylation, a metabolically regulated post-translational modification, is elevated in ADPKD kidneys. Using rapidly and slowly progressive ADPKD mouse models, we demonstrate that deleting O-GlcNAc transferase (Ogt) reduces renal cystogenesis and extends survival in a rapidly progressive model from postnatal day 21 to over a year. Pharmacological OGT inhibition similarly reduced cyst formation of patient-derived renal epithelial cells in vitro. In Pkd1 conditional knockout kidneys, Ogt deletion maintained phosphorylated AMPK and mitochondrial respiratory chain complex levels, preserving cellular energy sensing and production. Further, metabolomic analysis revealed normalization of glycolysis and of the hexosamine and hyaluronic acid biosynthesis pathways. In contrast, dysregulation of these pathways in Pkd1 conditional knockout kidneys culminated in increased tricarboxylic acid cycle entry, increased O-GlcNAc, and increased hyaluronic acid in the extracellular matrix, respectively. These findings identify Ogt as a central metabolic regulator and therapeutic target, linking metabolism to intracellular and extracellular mechanisms of cyst formation.