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Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...
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Analysis of Minerals Produced by hFOB 1.19 and Saos-2 Cells Using Transmission Electron Microscopy with Energy Dispersive X-ray Microanalysis
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Osteonectin bidirectionally regulates osteoblast mineralization.

Yun-Sen Zhu1, Ting-Ting Mo1, Chang Jiang1

  • 1Department of Orthopaedic Surgery, The First People's Hospital of Wenling, Chuan'an Nan Road NO 333, Wenling, 317500, Zhejiang, China.

Journal of Orthopaedic Surgery and Research
|October 8, 2023
PubMed
Summary

Osteonectin (ON) exhibits a dual dose-dependent effect on osteoblast mineralization, promoting it at low doses and inhibiting it at high doses. This involves the collagen-binding to DDR2 and activation of the P38 pathway.

Keywords:
Discoidin domain receptor 2MineralizationOsteonectinp38 MAPK signaling pathway

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Osteonectin (ON), also known as Secreted Protein Acidic and Rich in Cysteine (SPARC), plays a role in bone metabolism.
  • Understanding the precise regulatory mechanisms of ON on osteoblast mineralization is crucial for bone tissue engineering and regenerative medicine.

Purpose of the Study:

  • To investigate the bidirectional, dose-dependent effects of ON on osteoblast mineralization.
  • To elucidate the molecular mechanisms underlying ON's regulatory role, focusing on collagen synthesis, DDR2, and the P38 pathway.

Main Methods:

  • Osteoblasts were treated with varying concentrations of ON.
  • Gene and protein expression of key mineralization markers (BSP, OCN, OPN, ALP, Col 1) and signaling molecules (DDR2, P38) were analyzed using RT-qPCR and Western blot.
  • Mineralization was assessed via alizarin red staining, with collagen synthesis inhibition using DHB.

Main Results:

  • Low concentrations (1 ug/ml) of ON significantly enhanced osteoblast mineralization markers.
  • High concentrations (100 ug/ml) of ON, or low concentrations combined with a collagen synthesis inhibitor (DHB), significantly inhibited mineralization.
  • These effects were associated with modulation of DDR2, P38 pathway activation, and collagen type 1 expression.

Conclusions:

  • ON exerts a bidirectional, dose-dependent regulatory effect on osteoblast mineralization.
  • The interaction between collagen binding to DDR2 and subsequent P38 pathway activation is a key molecular mechanism in ON-mediated osteoblast regulation.