DAMPs in Unilateral Ureteral Obstruction

Area of Science:

• Nephrology
• Immunology
• Molecular Biology

Background:

• Unilateral ureteral obstruction (UUO) in animal models mimics renal disease progression.
• Kidney cells release damage-associated molecular patterns (DAMPs) upon injury.
• DAMPs trigger pattern recognition receptors (PRRs), initiating sterile inflammation and cytokine release.

Purpose of the Study:

• To investigate the role of DAMPs in renal fibrosis and congenital obstructive nephropathies using UUO models.
• To identify specific DAMPs and their receptors involved in UUO-induced kidney injury.
• To explore the therapeutic potential of targeting DAMPs in kidney diseases.

Main Methods:

• Utilized adult and neonatal mouse models of unilateral ureteral obstruction (UUO).
• Analyzed the expression of DAMPs (e.g., uric acid, HMGB1, S100 proteins) and their receptors (e.g., NLRP3, RAGE) post-UUO.
• Investigated mechanisms of cell death, including apoptosis and necroptosis, in the obstructed neonatal kidney.

Main Results:

• UUO models demonstrate accelerated renal fibrosis, inflammation, and cell death.
• Soluble uric acid activates NLRP3 inflammasome in adult UUO, promoting fibrosis and injury.
• RAGE is upregulated in neonatal UUO, with DAMPs like HMGB1 and S100 proteins contributing to fibrosis.
• Necroptosis is a significant inflammatory cell death pathway in neonatal UUO.

Conclusions:

• DAMPs and their recognition receptors are key mediators of sterile inflammation in UUO-induced kidney injury.
• Targeting DAMPs and PRRs presents a promising strategy for developing diagnostic and therapeutic interventions.
• Understanding DAMPs' roles is crucial for managing progressive renal disease and congenital obstructive nephropathies.