Related Experiment Videos
Enhanced expression of C chemokine lymphotactin in IgA nephropathy
Zhou Luo Ou1, Osamu Hotta, Yumiko Natori
1Department of Clinical Pharmacology, Research Institute, International Medical Center of Japan, Tokyo, Japan.
Insights
In IgA nephropathy, elevated lymphotactin and MCP-1 chemokines correlate with kidney damage and leukocyte infiltration. These findings suggest their role in disease progression.
Area of Science:
- Nephrology
- Immunology
- Molecular Biology
Background:
- Leukocyte infiltration is a hallmark of IgA nephropathy.
- Chemokines, such as lymphotactin, are implicated in renal disease pathogenesis.
- Lymphotactin's role in human IgA nephropathy was previously uncharacterized.
Purpose of the Study:
- To investigate the expression of lymphotactin and other chemokines in IgA nephropathy.
- To determine the correlation between chemokine expression and disease severity.
- To identify the cellular source of lymphotactin in the kidney.
Main Methods:
- Quantitative analysis of mRNA expression for lymphotactin, MCP-1, and MIP-1beta in renal cortex and glomeruli.
- Immunohistochemical staining to detect lymphotactin in kidney tissue.
- Correlation analysis with clinical parameters like glomerular crescents, tubulointerstitial changes, and proteinuria.
Main Results:
- mRNA levels of lymphotactin, MCP-1, and MIP-1beta were increased in IgA nephropathy patients.
- Elevated lymphotactin and MCP-1 mRNA levels were associated with glomerular crescents.
- Lymphotactin mRNA expression correlated with tubulointerstitial damage and proteinuria.
- Lymphotactin was localized to mast cells in the renal interstitium.
Conclusions:
- Lymphotactin and MCP-1 mRNA expression are upregulated in IgA nephropathy.
- These chemokines may contribute to leukocyte infiltration and disease progression.
- Mast cells are a potential source of lymphotactin in IgA nephropathy.
Abstract:
Leukocyte accumulation in the kidney is observed in patients with IgA nephropathy. Chemokines are a large family of cytokines chemotactic for leukocytes and have been shown to be upregulated in renal diseases. We previously reported that the gene expression of lymphotactin, a sole member of C chemokine subfamily, is enhanced in an animal model of crescentic glomerulonephritis, but its expression in human renal diseases is totally unknown. In the present study, we investigated the expression of mRNAs of lymphotactin and some other chemokines in IgA nephropathy. The expression of mRNAs for three chemokines, lymphotactin, MCP-1, and MIP-1beta, in renal cortex was increased and the levels of lymphotactin and MCP-1 mRNAs were statistically higher in patients with glomerular crescents than in those without crescents. These levels also correlated with tubulointerstitial changes and urinary protein excretion. Glomerular levels of mRNAs for lymphotactin and MCP-1, but not MIP-1beta, were higher in IgA nephropathy than controls. By immunohistochemical analysis, lymphotactin was detected in tryptase-positive cells (putative mast cells) in the interstitial space. These results suggest that lymphotactin, as well as MCP-1, may contribute to leukocyte infiltration and disease progression in IgA nephropathy.