Experimental crescentic glomerulonephritis: a new bicongenic rat model

Area of Science:

• Nephrology
• Immunology
• Genetics

Background:

• Crescentic glomerulonephritis (CRGN) causes kidney failure, with mechanisms poorly understood.
• Wistar Kyoto (WKY) rats are susceptible to CRGN, while Lewis (LEW) rats are resistant.
• Previous studies identified WKY genes Fcgr3 (Crgn1) and Jund (Crgn2) linked to CRGN susceptibility.

Purpose of the Study:

• To generate and characterize a bicongenic rat strain (LEW.WCrgn1,2) with WKY CRGN-susceptibility genes on a resistant LEW background.
• To investigate the development of CRGN phenotypes and macrophage function in this new strain.
• To assess the strain's response to different CRGN induction methods.

Main Methods:

• Generation of a bicongenic rat strain (LEW.WCrgn1,2) by introgressing WKY Crgn1 and Crgn2 genes into the LEW background.
• Induction of nephrotoxic nephritis (NTN) using nephrotoxic serum.
• Characterization of macrophage function and glomerular cytokine profiles.
• Immunization with recombinant rat α3(IV)NC1 to induce experimental autoimmune glomerulonephritis.

Main Results:

• The LEW.WCrgn1,2 bicongenic strain developed NTN phenotypes, including glomerular crescents.
• Macrophage function and cytokine profiles were characterized in the new strain.
• LEW.WCrgn1,2 rats showed resistance to glomerular crescent formation induced by α3(IV)NC1 immunization, unlike NTN induction.

Conclusions:

• The LEW.WCrgn1,2 strain represents the first CRGN model induced on a resistant rat genetic background.
• This bicongenic strain exhibits differential responses to distinct CRGN triggers.
• The LEW.WCrgn1,2 strain is a valuable new model for studying macrophage-dependent glomerulonephritis.