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Membrane attack complex and membrane cofactor protein are related to tubulointerstitial inflammation in various human
S Mosolits1, T Magyarlaki, J Nagy
1Department of Pathology, University School of Medicine, Pécs, Hungary.
Abstract:
Immunohistochemical analysis of the membrane attack complex (MAC) and the membrane cofactor protein (MCP) was performed on the tubuli and cortical vessels of 46 kidney biopsies with various types of human glomerulopathies. Irrespective of the type of glomerulopathy, significant correlations between tubular MAC and interstitial lymphomonocyte infiltration (p < 0.001) and interstitial volume (p < 0.02) were found. Tubular MCP was significantly overexpressed at the site of MAC deposition (p < 0.002). There was no correlation between the vascular MAC and MCP and tubulointerstitial lesions. Since tubular MAC is deposited in inflamed areas of tubulointerstitium, we propose that MAC might contribute to the development of tubulointerstitial inflammatory processes in human glomerulopathies. MCP as a regulatory factor in the tubulointerstitium might abrogate further tissue damage and cell-stimulatory effects of the MAC.
Insights
The membrane attack complex (MAC) in kidney tubules correlates with inflammation in glomerulopathy. Membrane cofactor protein (MCP) is overexpressed where MAC deposits, suggesting a role in regulating kidney damage.
Area of Science:
- Nephrology
- Immunology
- Pathology
Background:
- The Membrane Attack Complex (MAC) and Membrane Cofactor Protein (MCP) are key complement system components.
- Their roles in the tubulointerstitium during human glomerulopathies are not fully understood.
Purpose of the Study:
- To investigate the localization and correlation of MAC and MCP in kidney biopsies from patients with glomerulopathies.
- To explore the potential contribution of MAC to tubulointerstitial inflammation.
Main Methods:
- Immunohistochemical analysis of kidney biopsies (n=46) from patients with various glomerulopathies.
- Assessment of MAC and MCP deposition in tubular and vascular compartments.
- Correlation analysis with interstitial lymphomonocyte infiltration and interstitial volume.
Main Results:
- Tubular MAC deposition significantly correlated with interstitial lymphomonocyte infiltration and increased interstitial volume.
- Tubular MCP was significantly overexpressed at sites of MAC deposition.
- No significant correlation was found between vascular MAC/MCP and tubulointerstitial lesions.
Conclusions:
- Tubular MAC deposition is associated with tubulointerstitial inflammation in human glomerulopathies.
- MCP may act as a regulatory factor in the tubulointerstitium, potentially mitigating MAC-induced damage.