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Partial purification of smooth muscle cell derived growth factor
Journal of Tongji Medical University = Tong Ji Yi Ke Da Xue Xue Bao
|January 1, 1996
Summary
Researchers identified a novel mitogenic protein from rabbit aortic smooth muscle cells. This protein, distinct from known growth factors, stimulates NIH 3T3 fibroblast proliferation.
Area of Science:
- Cell Biology
- Biochemistry
- Molecular Biology
Background:
- Rabbit aortic smooth muscle cells secrete factors that influence cell growth.
- Understanding these factors is crucial for cardiovascular research.
Purpose of the Study:
- To isolate and characterize a mitogenic protein from cultured rabbit aortic smooth muscle cells.
- To determine if this protein represents a novel growth factor.
Main Methods:
- Serum-free conditioned medium was purified using ultrafiltration and heparin affinity chromatography.
- Mitogenic activity was assessed by [3H]-thymidine incorporation in NIH 3T3 fibroblasts.
- Protein molecular weight and iso-electric point were determined using SDS-PAGE and iso-electric focusing.
Main Results:
- A mitogenic protein was eluted from heparin-Sepharose between 1.0-1.6 mol/L NaCl.
- The protein exhibited a molecular weight of 22.8-26.7 kDa and an iso-electric point of approximately 4.6.
- These biochemical properties differ from known growth factors like PDGF, IGF, and FGF.
Conclusions:
- The isolated protein possesses mitogenic activity for fibroblasts.
- Its distinct biochemical characteristics suggest it is a novel growth factor, separate from PDGF, IGF, and FGF.