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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...
Hormones and Bone Tissue01:17

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...
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...
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 Remodeling and Repair01:31

Bone Remodeling and Repair

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...

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Related Experiment Video

Updated: Jul 10, 2026

Integrated Bone Formation Through In Vivo Endochondral Ossification Using Mesenchymal Stem Cells
06:05

Integrated Bone Formation Through In Vivo Endochondral Ossification Using Mesenchymal Stem Cells

Published on: July 14, 2023

Endostatin inhibits endochondral ossification.

A Sipola1, J Ilvesaro, E Birr

  • 1Department of Anatomy and Cell Biology, University of Oulu, Finland.

The Journal of Gene Medicine
|November 16, 2007
PubMed
Summary

Endostatin inhibits the cartilage phase of bone formation, reducing overall bone growth in an ectopic ossification model. This suggests endostatin may regulate bone healing and skeletal development.

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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

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Last Updated: Jul 10, 2026

Integrated Bone Formation Through In Vivo Endochondral Ossification Using Mesenchymal Stem Cells
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Integrated Bone Formation Through In Vivo Endochondral Ossification Using Mesenchymal Stem Cells

Published on: July 14, 2023

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification
07:23

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

Published on: December 3, 2016

Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Skeletal Biology

Background:

  • Angiogenesis is crucial for bone development and repair.
  • Vascular endothelial growth factor-A (VEGF-A) promotes angiogenesis.
  • Endostatin antagonizes VEGF-A, inhibiting endothelial cell activity.

Purpose of the Study:

  • To investigate the roles of VEGF-A and endostatin in angiogenesis and bone formation.
  • To examine their effects in a mouse ectopic ossification model using adenoviral gene delivery.

Main Methods:

  • Ectopic bone formation induced in mouse muscle using bone morphogenetic protein (BMP) extract.
  • Co-administration of VEGF-A and endostatin via adenoviral vectors.
  • Radiographic and histological analysis at 1, 2, and 3 weeks post-operation.

Main Results:

  • BMP extract induced significant bone formation across all groups.
  • VEGF-A enhanced blood vessel formation and chondroclast/osteoclast activity.
  • Endostatin inhibited vascularization and reduced bone formation, particularly at 3 weeks.

Conclusions:

  • Endostatin impedes the cartilage stage of endochondral ossification, decreasing bone formation.
  • Endostatin may serve as a regulator for bone growth and healing processes.