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Related Concept Videos

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.
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...
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...
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...

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Related Experiment Video

Updated: Jun 23, 2026

Culturing and Measuring Fetal and Newborn Murine Long Bones
06:58

Culturing and Measuring Fetal and Newborn Murine Long Bones

Published on: April 26, 2019

[Osteoblast differentiation and bone formation].

Ken Watanabe1, Kyoji Ikeda

  • 1Department of Bone and Joint Disease, National Center for Geriatrics and Gerontology (NCGG).

Nihon Rinsho. Japanese Journal of Clinical Medicine
|May 13, 2009
PubMed
Summary
This summary is machine-generated.

This review highlights signaling molecules that regulate osteoblast differentiation and function, crucial for bone formation and anabolic agent development. Understanding these pathways can lead to new treatments for bone diseases.

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Last Updated: Jun 23, 2026

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Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification
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Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification

Published on: December 3, 2016

Area of Science:

  • Bone biology and regenerative medicine.
  • Cellular and molecular signaling pathways.
  • Biochemistry and biophysics of bone.

Context:

  • Osteoblast lineage cells, derived from mesenchymal stem cells, are central to bone formation.
  • Osteoblasts regulate bone matrix synthesis, mineral metabolism, hematopoiesis, and bone resorption.
  • Recent research has identified key transcription factors and extracellular signals influencing osteoblast activity.

Purpose:

  • To review recent advances in understanding signaling molecules that regulate osteoblast differentiation and function.
  • To focus on molecular mechanisms affecting bone mass.
  • To provide insights for the development of bone anabolic agents.

Summary:

  • Osteoblast differentiation and function are controlled by transcription factors and extracellular signals like Hedgehog, Notch, Wnt, and BMP.
  • These signaling pathways are critical targets for developing bone anabolic agents.
  • Advances in this field offer potential therapeutic strategies for bone disorders.

Impact:

  • Informs the development of novel therapeutic strategies for bone diseases.
  • Enhances understanding of bone biology and osteoblast function.
  • Provides a foundation for future research in bone regenerative medicine and pharmacology.