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Bovine bone activin enhances bone morphogenetic protein-induced ectopic bone formation.
Y Ogawa1, D K Schmidt, R M Nathan
1Celtrix Pharmaceuticals, Palo Alto, California 94303.
The Journal of Biological Chemistry
|July 15, 1992
Summary
Bone contains activin A, which enhances ectopic bone formation when combined with bone morphogenetic proteins (BMPs). Activin A plays a key role in modulating bone formation, particularly woven bone development.
Area of Science:
- Biochemistry
- Orthopedics
- Cell Biology
Background:
- Bone tissue is a source of various growth factors.
- Bone morphogenetic proteins (BMPs) are known for their osteoinductive properties.
Purpose of the Study:
- To identify and characterize growth factors in demineralized bovine bone extract.
- To investigate the role of purified activin A in bone formation, particularly in conjunction with BMPs.
Main Methods:
- Purification of a 25-kDa homodimeric protein from bovine bone extract.
- Implantation of the purified protein with BMPs in a collagen/ceramic carrier into rat subcutis.
- Analysis of alkaline phosphatase activity and histological examination of implants after 14 days.
Main Results:
- The purified protein was identified as activin A.
- Bovine bone activin A, combined with BMP-2 and BMP-3, significantly enhanced ectopic woven bone formation.
- Activin A alone showed no osteoinductive activity, while BMPs alone showed moderate activity.
- The combination of activin A and BMPs resulted in high alkaline phosphatase activity and extensive woven bone with minimal cartilage.
Conclusions:
- Demineralized bone is a rich source of activin A.
- Activin A is a crucial modulator of bone formation, particularly in the context of BMPs, promoting woven bone development.