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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...

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.

Hormones and Bone Tissue

Hormones and Bone Tissue

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.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...

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 periosteum and...

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...

Bone Disorders

Bone Disorders

Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...

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Related Experiment Video

Updated: Jun 23, 2026

A Simple Pit Assay Protocol to Visualize and Quantify Osteoclastic Resorption In Vitro

A Simple Pit Assay Protocol to Visualize and Quantify Osteoclastic Resorption In Vitro

Published on: June 16, 2022

[Osteoclastogenesis and bone resorption].

Midori Nakamura¹, Yuko Nakamichi, Hiroshi Nakamura

¹Department of Biochemistry, Matsumoto Dental University.

Nihon Rinsho. Japanese Journal of Clinical Medicine

|May 13, 2009

Summary

This summary is machine-generated.

Osteoprotegerin (OPG) deficiency in mice leads to osteoporosis and accelerated bone formation, indicating a coupling between bone resorption and formation. Bisphosphonate treatment normalized these bone remodeling markers.

More Related Videos

Isolation, Purification, and Differentiation of Osteoclast Precursors from Rat Bone Marrow

Isolation, Purification, and Differentiation of Osteoclast Precursors from Rat Bone Marrow

Published on: May 19, 2019

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Last Updated: Jun 23, 2026

A Simple Pit Assay Protocol to Visualize and Quantify Osteoclastic Resorption In Vitro

A Simple Pit Assay Protocol to Visualize and Quantify Osteoclastic Resorption In Vitro

Published on: June 16, 2022

Isolation, Purification, and Differentiation of Osteoclast Precursors from Rat Bone Marrow

Isolation, Purification, and Differentiation of Osteoclast Precursors from Rat Bone Marrow

Published on: May 19, 2019

Area of Science:

Bone biology and cellular mechanisms of skeletal remodeling.
Endocrinology and the role of signaling molecules in bone metabolism.

Context:

Osteoclasts, derived from monocytes, are key to bone resorption.
Osteoclastogenesis is regulated by hormones, cytokines, and growth factors, involving osteoblasts.
Osteoprotegerin (OPG) is a crucial regulator, acting as a decoy receptor for RANKL.

Purpose:

To investigate the effects of osteoprotegerin (OPG) deficiency on bone remodeling in mice.
To explore the relationship between bone resorption and bone formation in vivo.
To assess the impact of bisphosphonate treatment on OPG-deficient mice.

Summary:

OPG-deficient mice exhibit osteoporosis due to enhanced bone resorption and accelerated bone formation.
High serum alkaline phosphatase and osteocalcin levels in OPG-deficient mice suggest increased bone turnover.
Bisphosphonate injection normalized these markers, supporting the coupling of bone formation and resorption.

Impact:

Highlights the critical role of OPG in balancing bone resorption and formation.
Provides in vivo evidence for the coupling of bone formation and resorption processes.
Suggests potential therapeutic targets for managing bone disorders like osteoporosis.