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Purification of human platelet-derived growth factor
Summary
Researchers purified platelet-derived growth factor (PDGF), a key factor stimulating connective tissue cell proliferation. This highly purified PDGF effectively promotes DNA synthesis and cell growth in laboratory cultures.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Biology
Background:
- Human platelets contain potent growth factors.
- Platelet-derived growth factor (PDGF) is implicated in connective tissue cell proliferation.
Purpose of the Study:
- To purify and characterize the polypeptide growth factor from human platelets.
- To assess the biological activity of purified PDGF on cell proliferation.
Main Methods:
- Heat treatment (100°C) of platelets.
- Ion-exchange chromatography, gel filtration, isoelectric focusing, and SDS-PAGE for purification.
- Assay of DNA synthesis and cell proliferation in BALB/c 3T3 cells.
Main Results:
- Purified PDGF has an isoelectric point of 9.8 and a molecular weight of 13,000–16,000 Da.
- Specific activity of purified PDGF is 20 million times higher than in serum.
- PDGF stimulates DNA synthesis and proliferation at 1 ng/ml.
Conclusions:
- Platelet-derived growth factor (PDGF) is a potent mitogen for connective tissue cells.
- The purification protocol yielded highly active PDGF.
- PDGF plays a significant role in cellular replication and tissue repair processes.