Kidney Transcriptome Sequencing of Mice with Diabetic Nephropathy
Aging is a major risk factor for diabetic kidney disease (DKD), with both conditions exhibiting similar renal pathology. We identify the energy-sensing molecule Retinoic acid-related orphan receptor ? (ROR?) as significantly downregulated in diabetic and aged kidneys. Tubule-specific ROR? deficiency exacerbates kidney injury, whereas its overexpression protects. Mechanistically, ROR? stabilizes insulin-induced gene 1 (INSIG1) by upregulating the deubiquitinase YOD1 and enhancing AMPK activity via CAB39, which together promote INSIG1 phosphorylation and subsequent stabilization. Stabilized INSIG1 potently blocks the ER-to-Golgi transport and activation of SREBP2 (cholesterol synthesis) and STING (inflammatory signaling). In diabetes, ROR? itself is suppressed transcriptionally by CTCF and functionally by impaired AMPK/SIRT1 signaling, which hinders its activation. Importantly, administration of a ROR? agonist or ROR?-enriched exosomes effectively alleviates diabetic kidney injury. Thus, ROR? emerges as a key regulatory node that mitigates DKD and renal aging by co-regulating AMPK-mediated metabolic and STING-driven innate immune pathways through INSIG1 stabilization. Overall design: db/db mice were used as the diabetic model and db/m mice as the control, followed by renal transcriptome sequencing.