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Solubilized bone morphogenetic protein (BMP) from mouse osteosarcoma and rat demineralized bone matrix
Clinical Orthopaedics and Related Research
|May 1, 1980
Summary
Bone morphogenetic protein (BMP) was isolated from osteosarcoma and bone matrix. BMP activity was found in low-density fractions, suggesting it aggregates with other proteins in vivo.
Area of Science:
- Biochemistry
- Molecular Biology
- Orthopedics
Background:
- Bone morphogenetic protein (BMP) is crucial for bone formation.
- Understanding BMP's properties aids in regenerative medicine and orthopedic research.
Purpose of the Study:
- To isolate and characterize bone morphogenetic protein (BMP).
- To investigate the aggregation state and density of BMP under different conditions.
- To identify factors influencing BMP activity.
Main Methods:
- Proteins were extracted from osteosarcoma and rat demineralized bone matrix using guanidine hydrochloride (GuHCl).
- Extracts were fractionated using cesium chloride (CsCl) density gradients.
- BMP activity was assessed under associative and dissociative conditions.
Main Results:
- BMP activity was highest in low-density fractions under dissociative conditions.
- BMP was found in the surface-gel fraction under associative conditions, indicating aggregation.
- A 63,000-dalton protein was consistently present in active BMP fractions.
- Rat BMP demonstrated bone-inducing activity in mice, showing no species specificity.
Conclusions:
- BMP is a low-density protein that aggregates with other proteins under physiological conditions.
- Cesium chloride density-gradient centrifugation is effective for BMP purification.
- BMP's non-species-specific nature offers potential for therapeutic applications.