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Demonstration of DNA replication factor C in human glomerular lesions
1Department of Internal Medicine, Amagasaki Prefectural Hospital, Japan.
Abstract:
Glomerulosclerosis is a common pathological finding in many human glomerular diseases that ultimately leads to end-stage kidney disease. The regulatory mechanism that controls mesangial proliferation as well as accumulation of mesangial matrix, however, is not known. Recently, a protein factor (MSW) which binds to the specific sequence of the promoter of the alpha 1 and alpha 2 type IV collagen genes was cloned. MSW was found to be identical to a large subunit (Alp145) of DNA replication factor C. These findings suggest that MSW may have important functions in mesangial cell proliferation and type IV collagen synthesis, both of which are prominent findings in glomerulosclerosis. In the present study, we report that augmented expression of MSW protein in human glomerular diseases that exhibit glomerulosclerosis (IgA nephropathy, membranoproliferative glomerulonephritis, and focal glomerulosclerosis). Minimal expression of MSW protein was observed in human glomerular diseases that rarely show glomerulosclerosis (membranous nephropathy, and minimal change nephrotic syndrome). There was a significant correlation between the levels of MSW expression and type IV collagen expression. Elevated expressions of both proliferating cell nuclear antigen and MSW were also observed in most patients with proliferative glomerular diseases. These studies suggest that MSW protein plays a regulatory role in the development of mesangial cell proliferation and matrix expansion during progression of glomerular injuries.
Insights
Mesangial cell proliferation factor MSW (mesangial sclerosis protein) is elevated in glomerulosclerosis, correlating with type IV collagen and cell proliferation. This suggests MSW protein regulates mesangial expansion in kidney disease.
Area of Science:
- Nephrology
- Molecular Biology
- Pathology
Background:
- Glomerulosclerosis is a key factor in end-stage kidney disease.
- The mechanisms regulating mesangial cell proliferation and matrix accumulation are not fully understood.
- MSW (mesangial sclerosis protein), a DNA replication factor C subunit, binds collagen IV gene promoters.
Purpose of the Study:
- To investigate the role of MSW protein in human glomerular diseases.
- To determine if MSW expression correlates with glomerulosclerosis and its associated pathologies.
- To explore MSW's potential role in mesangial cell proliferation and matrix expansion.
Main Methods:
- Analysis of MSW protein expression in human kidney biopsies from various glomerular diseases.
- Correlation analysis between MSW expression and markers of glomerulosclerosis, type IV collagen, and cell proliferation (PCNA).
Main Results:
- Augmented MSW protein expression was observed in glomerular diseases with glomerulosclerosis (IgA nephropathy, MPGN, FSGS).
- Minimal MSW expression was found in diseases rarely showing glomerulosclerosis (membranous nephropathy, minimal change disease).
- Significant correlation found between MSW expression, type IV collagen, and proliferating cell nuclear antigen (PCNA) in proliferative glomerular diseases.
Conclusions:
- MSW protein expression is significantly elevated in human glomerular diseases characterized by glomerulosclerosis.
- MSW protein levels correlate with type IV collagen deposition and mesangial cell proliferation.
- These findings suggest MSW plays a regulatory role in mesangial cell proliferation and matrix expansion during glomerular injury progression.