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Role of matrix vesicles in biomineralization
1Biochemistry Department, University of Pennsylvania School of Dental Medicine, 240 South 40th Street, Philadelphia, PA 19104, USA. ellis@biochem.dental.upenn.edu
Biochimica Et Biophysica Acta
|September 30, 2009
Summary
Matrix vesicles initiate hydroxyapatite mineral formation in cartilage and bone. These vesicles bud from cell membranes and contain specific proteins crucial for biomineralization, though their exact function remains under investigation.
Area of Science:
- Biochemistry
- Cell Biology
- Skeletal Biology
Background:
- Matrix vesicles have been studied for over 40 years for their role in calcified cartilage, bone, and dentin mineralization.
- Their precise function in hydroxyapatite nucleation and association with collagen fibrils has been a long-standing debate.
Purpose of the Study:
- To review the historical and recent findings on matrix vesicles in biomineralization.
- To present current hypotheses explaining the detailed function of matrix vesicles.
Main Methods:
- Comprehensive review of existing literature on matrix vesicles.
- Emphasis on recent research and emerging hypotheses.
Main Results:
- General acceptance of matrix vesicles as the initial site of mineral formation.
- Matrix vesicles bud from plasma membranes, carrying a subset of parent membrane components.
- Key proteins (alkaline phosphatase, nucleotide pyrophosphatase phosphodiesterase, annexin V) play vital roles.
- Matrix vesicles regulate pyrophosphate (PPi) concentration in the matrix.
Conclusions:
- Matrix vesicles are accepted to have essential roles in initiating mineralization.
- Specific proteins and PPi regulation are critical functions.
- Despite advancements, many questions regarding matrix vesicle function remain unanswered.
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