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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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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
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Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
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Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
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Related Experiment Video

Updated: May 1, 2026

A Simple Pit Assay Protocol to Visualize and Quantify Osteoclastic Resorption In Vitro
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Vinculin regulates osteoclast function.

Tomohiro Fukunaga1, Wei Zou, Julia T Warren

  • 1From the Departments of Pathology and Immunology and.

The Journal of Biological Chemistry
|March 29, 2014
PubMed
Summary
This summary is machine-generated.

Vinculin (VCL) is crucial for osteoclast function and bone resorption. Inhibiting VCL

Keywords:
BoneCell BiologyCytoskeletonIntegrinsOsteoclastVinculin

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Area of Science:

  • Cell Biology
  • Bone Biology
  • Biochemistry

Background:

  • Osteoclastic bone resorption is essential for skeletal remodeling.
  • The actin cytoskeleton organization is critical for osteoclast function.
  • Vinculin (VCL) is an actin-binding protein with a known role in cell adhesion.

Purpose of the Study:

  • To investigate the role of vinculin (VCL) in osteoclast differentiation and bone resorption.
  • To determine the specific domains and interactions of VCL critical for osteoclast function.

Main Methods:

  • Generation of VCL-deficient osteoclast models using Cre-lox technology (CtsK-VCL and LysM-VCL mice).
  • Assessment of osteoclast differentiation, actin ring formation, and bone resorption assays.
  • Analysis of VCL interactions with talin and Arp2/3, and rescue experiments with VCL mutants.

Main Results:

  • VCL deficiency in osteoclasts leads to cytoskeletal disorganization, impaired actin ring formation, and significantly reduced bone resorption.
  • VCL-deficient mice exhibit doubled bone mass, indicating inhibited skeletal degradation.
  • VCL binding to talin, but not Arp2/3, is essential for osteoclast function, as demonstrated by rescue experiments with specific VCL mutants.

Conclusions:

  • Vinculin is indispensable for the proper organization of the osteoclast cytoskeleton and effective bone resorption.
  • Targeting the VCL-talin interaction presents a potential therapeutic strategy for conditions characterized by excessive bone loss.