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Collagen type XV and the 'osteogenic status'.

Gina Lisignoli1, Elisabetta Lambertini2, Cristina Manferdini1

  • 1Laboratorio di Immunoreumatologia e Rigenerazione Tissutale, Istituto Ortopedico Rizzoli, Bologna, Italy.

Journal of Cellular and Molecular Medicine
|March 24, 2017
PubMed
Summary

Collagen type XV (ColXV) is a novel bone extracellular matrix (ECM) protein. Its expression is linked to early bone matrix organization, decreasing as mineralization progresses.

Keywords:
collagen XVmesenchymal stromal cellsmineralizationosteoblastsosteogenesis

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biomaterials Science

Background:

  • Extracellular matrix (ECM) composition influences stem cell behavior.
  • Collagen type XV (ColXV) is a novel bone ECM protein.
  • ECM components regulate stemness and differentiation.

Purpose of the Study:

  • Investigate the correlation between ColXV expression and mineral matrix deposition.
  • Determine ColXV's role in osteogenic differentiation of human mesenchymal stromal cells (hMSCs) and osteoblasts (hOBs).

Main Methods:

  • Assessed ColXV expression in hMSCs with varying osteogenic potential (hWJMSCs vs. hBMMSCs).
  • Analyzed ColXV levels during osteogenic induction with and without calcium.
  • Cultured hOBs in media with and without calcium to assess ColXV response to matrix calcification.

Main Results:

  • Lower basal ColXV levels were observed in less osteo-inductive hWJMSCs compared to hBMMSCs.
  • ColXV was detected during early osteogenic differentiation but decreased significantly with matrix calcification.
  • Absence of calcium in culture medium prevented matrix calcification and maintained ColXV expression.

Conclusions:

  • ColXV expression is inversely correlated with mineral matrix deposition during osteogenesis.
  • ColXV may play a role in early ECM organization, preceding and facilitating matrix mineralization.
  • Matrix calcification, not calcium ions alone, negatively impacts ColXV expression.