ELF3 links kidney function GWAS loci to maladaptive epithelial inflammation

Area of Science:

• Nephrology
• Molecular Biology
• Genetics

Background:

• Genome-wide association studies (GWAS) have identified numerous kidney function loci, but effector genes and mechanisms are often unclear.
• Understanding genetic factors influencing kidney function is crucial for developing targeted therapies for kidney diseases.

Purpose of the Study:

• To identify the effector gene at a kidney function GWAS locus.
• To elucidate the role of ELF3 in the inflammatory response of injured proximal tubules (iPTs) in chronic kidney disease (CKD).

Main Methods:

• Utilized mouse models of kidney injury and human CKD samples.
• Performed conditional gene deletion of Elf3 in mice.
• Investigated ELF3's mechanism of action via binding assays and analysis of the NF-κB pathway.
• Employed spatial transcriptomics and immunofluorescence in human kidney tissues.

Main Results:

• ELF3 expression is induced in iPTs during kidney injury and CKD, correlating with inflammation.
• Conditional deletion of Elf3 in mice reduced iPT accumulation, cytokine production, and immune cell recruitment.
• ELF3 directly activates noncanonical NF-κB pathway components, driving cytokine induction.
• ELF3 expression in human CKD kidneys is linked to disease progression and functional decline.

Conclusions:

• ELF3 is a genetically validated effector gene driving inflammatory reprogramming in iPTs.
• ELF3 acts as an epithelial proinflammatory amplifier in kidney injury.
• ELF3 represents a potential therapeutic target for mitigating maladaptive inflammation in CKD.