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Related Concept Videos

Bone Formation by Endochondral Ossification01:24

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 Cells and Tissue01:30

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...
Osteoclasts in Bone Remodeling01:31

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 Formation by Intramembranous Ossification01:29

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.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...
Bone Remodeling01:40

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.
Growth of Cartilage and Bone Tissue01:27

Growth of Cartilage and Bone Tissue

Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...

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Differentiation and Characterization of Osteoclasts from Human Induced Pluripotent Stem Cells
10:52

Differentiation and Characterization of Osteoclasts from Human Induced Pluripotent Stem Cells

Published on: March 22, 2024

Osteoclast formation and differentiation: an overview.

Niroshani Surangika Soysa1, Neil Alles, Kazuhiro Aoki

  • 1Section of Pharmacology, Department of Bio-Matrix, Graduate School, Tokyo Medical and Dental University, Japan.

Journal of Medical and Dental Sciences
|July 31, 2013
PubMed
Summary
This summary is machine-generated.

Osteoclast differentiation, crucial for bone remodeling, involves precursor cell fusion regulated by RANK-RANKL signaling. Understanding these pathways aids in managing bone diseases like osteoporosis.

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Last Updated: May 9, 2026

Differentiation and Characterization of Osteoclasts from Human Induced Pluripotent Stem Cells
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Published on: May 13, 2014

Area of Science:

  • Bone biology
  • Cell biology
  • Hematopoiesis

Background:

  • Osteoclasts are essential multinucleated cells derived from myeloid progenitors responsible for bone resorption.
  • Osteoclast formation involves the fusion of mononuclear precursor cells.
  • RANK-RANKL signaling is a key regulator of osteoclast differentiation.

Purpose of the Study:

  • To provide a concise overview of the molecular mechanisms governing osteoclast formation and differentiation.
  • To highlight the importance of understanding osteoclast biology in bone remodeling and disease.

Main Methods:

  • Review of existing literature on osteoclast differentiation pathways.
  • Analysis of key signaling molecules and cellular processes involved.

Main Results:

  • Identification of RANK-RANKL signaling as a central pathway.
  • Elucidation of the multi-step process of osteoclastogenesis from myeloid progenitors.
  • Recognition of the role of osteoclasts in bone modeling and remodeling.

Conclusions:

  • A comprehensive understanding of osteoclast differentiation is critical for developing therapeutic strategies for bone diseases.
  • Further research into osteoclast biology can alleviate the socioeconomic burden of conditions like osteoporosis and rheumatoid arthritis.