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Crescentic glomerulonephritis--a manifestation of a nephritogenic Th1 response?
A R Kitching1, S R Holdsworth, P G Tipping
1Monash University Department of Medicine, Monash Medical Centre, Clayton, Victoria, Australia. richard.kitching@med.monash.edu.au
Insights
Crescentic glomerulonephritis (GN) involves severe kidney damage. Research suggests it stems from a T helper 1 (Th1) immune response, similar to delayed type hypersensitivity, involving key cytokines like IL-12 and IFN-gamma.
Area of Science:
- Nephrology
- Immunology
- Pathology
Background:
- Crescentic glomerulonephritis (GN) is a severe kidney disease characterized by glomerular crescent formation.
- It indicates a poor renal prognosis and is linked to proliferative forms of GN.
- Accumulating evidence suggests GN is a delayed type hypersensitivity (DTH)-like immune response to nephritogenic antigens.
Purpose of the Study:
- To test the hypothesis that crescentic GN is a manifestation of a T helper 1 (Th1) predominant DTH-mediated immune response.
- To investigate the roles of specific cytokines, such as IL-12 and IFN-gamma, in crescent formation.
- To correlate findings from experimental models with human crescentic GN.
Main Methods:
- Utilized a murine model of crescentic glomerulonephritis.
- Manipulated cytokine levels, including administering IL-12, deleting IL-4/IL-10, and administering IL-4/IL-10.
- Examined immune effectors in glomeruli and cytokine production in human studies.
Main Results:
- Crescent formation in the murine model was dependent on IL-12 and IFN-gamma.
- Administration of IL-12 or deletion of IL-4/IL-10 enhanced crescentic GN.
- Exogenous IL-4 and/or IL-10 reduced crescentic injury in experimental models.
Conclusions:
- Human crescentic GN is likely a manifestation of a Th1-mediated DTH-like nephritogenic immune response.
- Cytokines like IL-12 and IFN-gamma play a crucial role in the pathogenesis of crescentic GN.
- Understanding the immune mechanisms provides insights into potential therapeutic targets.
Abstract:
Crescentic glomerulonephritis (GN) is the histopathological correlate of the clinical syndrome of rapidly progressive glomerulonephritis. Glomerular crescent formation complicates proliferative forms of GN and indicates severe disease with a poor renal prognosis. In the past 10 years evidence from experimental models of GN and from human disease has accumulated suggesting that crescentic glomerulonephritis is a manifestation of a delayed type hypersensitivity (DTH)-like response to nephritogenic antigens. The elucidation of T helper 1 (Th1) and Th2 subsets in mice and in humans has led to the hypothesis that crescentic GN is a manifestation of a Th1 predominant DTH mediated immune response. Recent experiments performed mainly in a murine model of crescentic glomerulonephritis have tested this hypothesis. Crescent formation in this model is substantially interleukin (IL)-12 and interferon-gamma (IFN-gamma) dependent. Administration of IL-12, deletion of endogenous IL-4 or IL-10 results in enhanced disease, while administration of exogenous IL-4 and/or IL-10 reduces crescentic injury. These findings, together with the available evidence from human studies (examining the pattern of immune effectors in glomeruli, data on cytokine production by peripheral blood mononuclear cells and case reports of the induction of proliferative and/or crescentic GN by administration of IFN-gamma or IL-2) suggest that human crescentic GN is manifestation of a Th1 mediated DTH-like nephritogenic immune response.