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Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

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 bone...
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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.

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Analysis of Schwann-astrocyte Interactions Using In Vitro Assays
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Published on: January 13, 2011

Interaction between Schwann cells and osteoblasts in vitro.

Xiao-xiao Cai1, En Luo, Quan Yuan

  • 1Bone Biology Research Laboratory, Children's Hospital Boston, Harvard Medical School, Boston, USA

International Journal of Oral Science
|August 27, 2010
PubMed
Summary

Schwann cells support nerve regeneration and enhance osteoblast proliferation and differentiation. This study shows co-culturing Schwann cells with osteoblasts promotes bone cell activity and neurotrophin production.

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Regenerative Medicine

Background:

  • Schwann cells are crucial for nerve regeneration.
  • Osseointegrated implants aim to integrate with bone and restore function.
  • Enhancing sensory responses in implants is a key goal.

Purpose of the Study:

  • To investigate the interaction between Schwann cells and osteoblasts.
  • To evaluate the potential of Schwann cells in promoting osseointegration.

Main Methods:

  • Co-culturing rat Schwann cells and osteoblasts using Transwell inserts.
  • Assessing Schwann cell proliferation via MTT assay.
  • Measuring neurotrophin (BDNF, NGF) levels using ELISA and qPCR.
  • Evaluating osteoblast differentiation using ALP and Alizarin Red staining.

Main Results:

  • Schwann cells maintained proliferation and neurotrophin synthesis in co-culture.
  • Osteoblasts showed significantly increased proliferation.
  • Co-cultured osteoblasts exhibited enhanced alkaline phosphatase activity and calcification.

Conclusions:

  • Schwann cells synthesize neurotrophins that promote osteoblast proliferation and differentiation.
  • This in vitro study suggests a potential benefit of Schwann cells for osseointegrated implants.