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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 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 Formation by Intramembranous Ossification01:29

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Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
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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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Fractures: Bone Repair01:27

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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 contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...
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Related Experiment Video

Updated: Feb 27, 2026

Improved Methodology for Studying Postnatal Osteogenesis via Intramembranous Ossification in a Murine Bone Marrow Injury Model
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Osteomacs and Bone Regeneration.

Lena Batoon1, Susan Marie Millard1, Liza Jane Raggatt1,2

  • 1Bones and Immunology Laboratory, Cancer Biology and Care Program, Mater Research Institute - The University of Queensland, Translational Research Institute, 37 Kent Street, Woolloongabba, QLD, 4102, Australia.

Current Osteoporosis Reports
|June 26, 2017
PubMed
Summary
This summary is machine-generated.

Macrophages are crucial for bone regeneration, especially in healing injuries and lifelong bone remodeling. Their function is impacted by aging and inflammation, highlighting therapeutic potential for bone health.

Keywords:
Bone regenerationFracture repairInflammagingMacrophagesOsteoporosisSenescence

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Area of Science:

  • Bone Biology
  • Immunology
  • Regenerative Medicine

Background:

  • Macrophages play a vital role in bone regeneration.
  • Osteal macrophages are key players in basic multicellular units for bone remodeling and repair.
  • Understanding macrophage function is critical for bone homeostasis.

Purpose of the Study:

  • To review the critical contribution of macrophages, particularly osteal macrophages, to bone regeneration.
  • To examine the role of macrophages in lifelong bone regeneration and in response to injury.
  • To discuss the distinctions between macrophage and osteoclast contributions to bone homeostasis.

Main Methods:

  • Literature review of studies on macrophages and bone regeneration.
  • Analysis of the colony-stimulating factor 1-colony-stimulating factor 1 receptor axis.
  • Discussion of aging's impact on macrophage function and fracture repair.

Main Results:

  • Macrophages are essential for coordinating bone regeneration and remodeling.
  • The colony-stimulating factor 1-colony-stimulating factor 1 receptor axis has a dichotomous role in bone homeostasis.
  • Aging and inflammation negatively impact macrophage function, affecting fracture repair.

Conclusions:

  • Macrophages are central to bone regeneration and repair processes.
  • Therapeutic strategies targeting macrophages could improve bone health and regeneration.
  • Further research is needed to close knowledge gaps in modulating macrophage function for bone health.