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Role of platelet-derived growth factor in glomerular disease
R J Johnson1, J Floege, W G Couser
1Department of Medicine, University of Washington Medical Center, Seattle.
Abstract:
An approach for establishing a role for a growth factor in glomerular disease is presented. Using platelet-derived growth factor (PDGF) as an example, there is strong evidence to support the hypothesis that PDGF is a mediator of mesangial cell proliferation in glomerulonephritis. This includes evidence that (1) PDGF is a mitogen for mesangial cells in culture; (2) PDGF is expressed in both experimental and human glomerulonephritis in which mesangial cell proliferation occurs; (3) infusion of PDGF into rats induces mesangial cell proliferation and a hypercellular lesion; and (4) inhibition of PDGF in a model of experimental nephritis significantly reduces the mesangial cell proliferation. However, these data do not answer the question of whether or not the inhibition of PDGF in human diseases would be beneficial in the long term, because some cell proliferation is likely required for normal healing and repair. Further studies will be necessary to resolve this issue.
Insights
Platelet-derived growth factor (PDGF) drives mesangial cell proliferation in glomerulonephritis. Inhibiting PDGF reduces cell proliferation in experimental nephritis, but long-term benefits in humans remain uncertain due to repair needs.
Area of Science:
- Nephrology
- Cell Biology
- Molecular Medicine
Background:
- Glomerular diseases are characterized by inflammation and cell proliferation.
- Platelet-derived growth factor (PDGF) is a key growth factor implicated in cellular processes.
Discussion:
- PDGF acts as a mitogen for mesangial cells in vitro.
- PDGF expression is elevated in experimental and human glomerulonephritis.
- In vivo studies show PDGF infusion induces mesangial cell proliferation and hypercellular lesions in rats.
Key Insights:
- PDGF is a significant mediator of mesangial cell proliferation in glomerulonephritis.
- Inhibition of PDGF effectively reduces mesangial cell proliferation in experimental nephritis models.
Outlook:
- Further research is needed to determine the long-term therapeutic efficacy of PDGF inhibition in human glomerular diseases.
- Balancing the inhibition of pathological proliferation with the necessity of cellular repair for healing is crucial.