Gremlin activates the Notch pathway linked to renal inflammation

Area of Science:

• Nephrology
• Molecular Biology
• Immunology

Background:

• Gremlin is implicated in renal damage and chronic kidney diseases.
• Inflammation is a key feature of progressive renal disease.
• The Notch signaling pathway is active in chronic kidney disease, but its regulation by Gremlin is unknown.

Purpose of the Study:

• To investigate whether Gremlin regulates the Notch signaling pathway in the kidney.
• To explore the role of Gremlin-Notch pathway activation in kidney inflammation.
• To assess the therapeutic potential of Notch inhibition in renal diseases.

Main Methods:

• Gremlin administration in cultured tubular cells and murine kidneys.
• Analysis of Notch pathway components (Jagged-1, N1ICD, hes-1, hey-1) gene expression and protein levels.
• Notch inhibition using DAPT in Gremlin-injected mice and experimental renal injury models.
• Assessment of inflammatory cell infiltration, cytokine expression, and NF-κB pathway activation.

Main Results:

• Gremlin up-regulated Notch pathway components and Jagged-1 production in vitro and in vivo.
• Gremlin administration led to increased nuclear N1ICD and downstream effector gene expression.
• Notch inhibition with DAPT reduced renal inflammation and inflammatory cytokine overexpression.
• Notch inhibition blocked Gremlin-induced NF-κB pathway activation.

Conclusions:

• Gremlin activates the Notch signaling pathway in the kidney.
• Gremlin-induced kidney inflammation is mediated by NF-κB signaling.
• Notch inhibition represents a potential anti-inflammatory strategy for renal diseases.