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Published on: December 10, 2010
ASARM-truncated MEPE and AC-100 enhance osteogenesis by promoting osteoprogenitor adhesion
Andrew P Sprowson1, Andrew W McCaskie, Mark A Birch
1Musculoskeletal Research Group, Institute for Cellular Medicine, The Medical School, Newcastle University, Newcastle upon Tyne NE2 4HH, United Kingdom.
Abstract:
Matrix extracellular phosphoglycoprotein (MEPE) is a member of the SIBLING (Small Integrin-Binding Ligand, N-linked Glycoprotein) family of secreted glycophosphoproteins. Several previous studies have demonstrated that MEPE and its peptide motif, AC-100, may regulate bone mass and influence osteoblast activity, suggesting its potential for inclusion in novel therapeutic strategies aimed at increasing osteogenesis. Our study uses in vitro approaches to assess how adhesion of nonadherent cells is influenced by MEPE and whether response to MEPE is dependent on the maturity of osteoblastic cells. Truncated MEPE (ASARM removed) or AC-100 enhanced the adhesion, spreading, and focal complex formation of unadhered osteoblastic cells leading to increased differentiation and bone formation after 28 days of culture. Furthermore, addition of truncated MEPE or AC-100 to mature osteoblasts had no significant effect on bone formation. Our data supports an action for truncated MEPE and AC-100 in altering the physiology of immature poorly adherent cells which subsequently influences the way in which these cells interact with a substrate to facilitate their survival and/or commitment to the osteoblast lineage.
Insights
Matrix extracellular phosphoglycoprotein (MEPE) and its peptide AC-100 promote osteoblast adhesion and differentiation in immature cells. This suggests MEPE
Area of Science:
- Biochemistry
- Cell Biology
- Bone Biology
Background:
- Matrix extracellular phosphoglycoprotein (MEPE) is a SIBLING protein involved in bone metabolism.
- MEPE and its peptide motif AC-100 may regulate bone mass and osteoblast activity.
- Potential therapeutic applications for increasing osteogenesis exist for MEPE.
Purpose of the Study:
- To investigate how MEPE influences the adhesion of nonadherent osteoblastic cells.
- To determine if the response to MEPE is dependent on osteoblast maturity.
Main Methods:
- In vitro cell culture models were utilized.
- Assessed cell adhesion, spreading, and focal complex formation.
- Evaluated osteoblast differentiation and bone formation over 28 days.
Main Results:
- Truncated MEPE (ASARM removed) and AC-100 enhanced adhesion, spreading, and focal complex formation in unadhered osteoblastic cells.
- These effects led to increased differentiation and bone formation in immature osteoblasts.
- Mature osteoblasts showed no significant response to truncated MEPE or AC-100 regarding bone formation.
Conclusions:
- Truncated MEPE and AC-100 modulate the physiology of immature, poorly adherent osteoblastic cells.
- This modulation enhances cell-substrate interaction, promoting survival and commitment to the osteoblast lineage.
- These findings support MEPE's role in early osteogenesis and suggest therapeutic potential.
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