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Gene expression of CC chemokines in experimental crescentic glomerulonephritis (CGN)
1Division of Pathophysiology, Research Institute, International Medical Centre of Japan, Tokyo.
Insights
Chemokines like MCP-1, MCP-3, MIP-1alpha, MIP-1beta, RANTES, and TCA3 are expressed in rapidly progressive glomerular disease (CGN). These CC chemokines may drive monocyte recruitment and activation in CGN pathogenesis.
Area of Science:
- Immunology
- Nephrology
- Molecular Biology
Background:
- Crescentic glomerulonephritis (CGN) is a severe kidney disease characterized by rapid progression.
- Monocytes and macrophages infiltrate glomeruli in CGN, playing a key role in disease development.
- Previous studies identified monocyte chemoattractant protein-1 (MCP-1) in experimental CGN.
Purpose of the Study:
- To investigate the expression of other CC chemokines (MCP-3, MIP-1alpha, MIP-1beta, RANTES, TCA3) in an experimental CGN model.
- To understand the role of these chemokines in monocyte recruitment and activation during CGN pathogenesis.
Main Methods:
- Established a reverse transcriptase-polymerase chain reaction (RT-PCR) method for separate amplification of CC chemokine mRNAs.
- Quantified CC chemokine mRNA expression in glomeruli at various time points post-CGN induction in rats.
Main Results:
- All investigated CC chemokines (MCP-3, MIP-1alpha, MIP-1beta, RANTES, TCA3) were expressed in CGN glomeruli.
- Gene expression of macrophage inflammatory protein-1alpha (MIP-1alpha) and MIP-1beta appeared earlier than other CC chemokines.
- Evidence suggests CC chemokines contribute to monocyte recruitment and activation in CGN.
Conclusions:
- CC chemokines are significantly involved in the pathogenesis of CGN.
- Different CC chemokines likely have distinct yet overlapping roles in monocyte recruitment and activation within the glomerulus.
- Further research into specific chemokine functions could reveal therapeutic targets for CGN.
Abstract:
CGN is a rapidly progressive glomerular disease. Monocytes/macrophages are frequently observed in glomeruli in cases of CGN and they are considered to play a crucial role in the pathogenesis of this disease. We described previously the glomerular expression of monocyte chemoattractant protein-1 (MCP-1), which is a potent chemoattractant for monocytes and a member of CC chemokine family, in an experimental model of CGN. In the present study we investigated the expression of mRNAs for other CC chemokines, namely, MCP-3, macrophage inflammatory protein-1alpha (MIP-1alpha), MIP-1beta, RANTES and TCA3, all of which are chemotactic for monocytes, in the CGN model. First, we established a reverse transcriptase-polymerase chain reaction (RT-PCR) method by which mRNA for each of the CC chemokines could be amplified separately, and then we measured the levels of the expression of mRNAs for the chemokines in diseased glomeruli at several time points after induction of CGN. The mRNAs for all CC chemokines examined were expressed in glomeruli of rats with CGN. Moreover, induction of the gene expression of MIP-1alpha and MIP-1beta seemed to occur earlier than that of the others. CC chemokines may contribute to the recruitment and activation of monocytes in CGN, and each individual CC chemokine may play an overlapping but distinct role in the pathogenesis of this disease.