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Osteoclasts in Bone Remodeling

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 Cells and Tissue

Bone Cells and Tissue

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.
Osteoblasts and Osteocytes
The osteoblast is the bone cell responsible for forming new bone tissue. It is found in the growing portions of bone, including the...

Bone Remodeling

Bone Remodeling

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.

The Bone Matrix

The Bone Matrix

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...

Bone Formation by Intramembranous Ossification

Bone Formation by Intramembranous Ossification

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 Ossification

Bone Formation by Endochondral Ossification

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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Related Experiment Video

Updated: Jan 8, 2026

Osteoclast Derivation from Mouse Bone Marrow

Osteoclast Derivation from Mouse Bone Marrow

Published on: November 6, 2014

Cell fusion in osteoclastogenesis.

Leonid V Chernomordik¹, Kamran Melikov¹

¹Section on Membrane Biology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, 20892, U.S.A.

Biochemical Society Transactions

|December 19, 2025

Summary

This summary is machine-generated.

Osteoclast fusion creates multinucleated cells essential for bone remodeling. Understanding the proteins regulating this process is key to treating bone diseases.

Keywords:

Annexin A5 Syncytin 1 fusion pathway osteoclast fusion phosphatidylserine

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Area of Science:

Cell Biology
Bone Biology
Biochemistry

Background:

Multinucleated osteoclasts are crucial for bone remodeling through the fusion of mononucleated precursors.
Osteoclast bone-resorbing activity increases with size, necessitating tight control over fusion initiation and termination.

Purpose of the Study:

To review the mechanisms and proteins involved in osteoclast fusion.
To highlight the similarities and differences between osteoclast fusion and other cell-cell fusion processes.
To identify knowledge gaps in the protein machinery of osteoclast fusion.

Main Methods:

Literature review of cell fusion mechanisms.
Comparative analysis of osteoclast fusion with skeletal muscle cell formation.
Discussion of regulatory proteins and pathways.

Main Results:

Osteoclast fusion shares mechanistic similarities with other cell-cell fusion events.
The specific protein machinery driving osteoclast membrane rearrangements remains poorly understood.
Regulation of osteoclast fusion is critical for maintaining bone homeostasis.

Conclusions:

Understanding osteoclast fusion mechanisms is vital for bone health.
Further research into osteoclast fusion proteins could lead to new treatments for skeletal disorders.
Targeting osteoclast fusion offers potential therapeutic strategies for diseases involving abnormal bone resorption.