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Related Concept Videos

Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

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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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Bone Remodeling01:40

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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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Bone Cells and Tissue01:30

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Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
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Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
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Bone Formation by Endochondral Ossification01:24

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Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...
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Osteoclasts and Remodeling Based Bone Formation.

Elina Kylmaoja, Miho Nakamura, Juha Tuukkanen1

  • 1Department of Anatomy and Cell Biology, University of Oulu, Oulu, Finland.

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Osteoclasts, crucial for bone remodeling, secrete signals that stimulate bone formation. Understanding this mechanism offers new avenues for tissue engineering and bone defect repair.

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Area of Science:

  • Bone biology
  • Tissue engineering
  • Cellular signaling

Background:

  • Osteoclasts, derived from monocytes/macrophages, are key to bone remodeling through resorption.
  • Osteoblasts, originating from mesenchymal stem cells, are responsible for new bone formation.
  • Ectopic bone formation can be induced, highlighting the plasticity of osteogenesis.

Purpose of the Study:

  • To explore the potential of osteoclast-derived signals in tissue engineering for bone repair.
  • To leverage the understanding of bone remodeling's intrinsic regulation for therapeutic applications.
  • To investigate scaffold materials that promote both bone resorption and formation.

Main Methods:

  • Detailed analysis of the molecular basis of bone remodeling.
  • Delineation of the coupling mechanisms between bone resorption and formation.
  • Utilizing scaffold materials (decellularized matrices, mineral matrices) to induce resorption and bone formation.

Main Results:

  • Osteoclasts not only resorb bone but also release anabolic signals.
  • These signals stimulate mesenchymal stem cells and osteoblasts to initiate osteogenesis.
  • Scaffold materials can simultaneously induce resorption and bone formation.

Conclusions:

  • Osteoclast-derived signals represent a promising target for tissue engineering applications.
  • A deeper understanding of bone remodeling's intrinsic regulation can advance bone defect repair strategies.
  • Biomaterials that mimic the resorption-formation coupling show potential for regenerative medicine.