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Related Concept Videos

Bone Formation by Endochondral Ossification01:24

Bone Formation by Endochondral Ossification

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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...
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Bone Formation by Intramembranous Ossification01:29

Bone Formation by Intramembranous Ossification

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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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Growth of Cartilage and Bone Tissue01:27

Growth of Cartilage and Bone Tissue

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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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Mesenchymal Stem Cells01:19

Mesenchymal Stem Cells

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Mesenchymal stem cells (MSCs) are adult stem cells that can differentiate into most connective tissue cell types, except for hematopoietic cells, depending upon the source of MSCs. For example, bone-marrow-derived MSCs (BM-MSCs) can differentiate into osteocytes, hepatocytes, and pancreatic and neuronal cells. MSCs can be isolated from various sources such as bone marrow, placenta, adipose tissue, teeth, and Wharton’s jelly, a gelatinous substance in the umbilical cord. The ease of their...
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Development of the Limb Synovial Joints01:07

Development of the Limb Synovial Joints

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Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
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Updated: Jul 20, 2025

Author Spotlight: Enhancing Bone Regeneration with Vascularized Artificial Cartilage Integration
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Integrated Bone Formation Through In Vivo Endochondral Ossification Using Mesenchymal Stem Cells.

Shintaro Yamazaki1, Yujing Lin2, Eriko Marukawa2

  • 1Department of Molecular Craniofacial Embryology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University; Department of Maxillofacial Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University.

Journal of Visualized Experiments : Jove
|July 31, 2023
PubMed
Summary

Hyaluronic acid hydrogels support mesenchymal stem cell (MSC) cartilage formation and promote endochondral ossification (ECO) for bone regeneration. This approach offers a promising solution for critical-sized bone defects, overcoming limitations of conventional therapies.

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Conventional bone regeneration using mesenchymal stem cells (MSCs) is limited for large defects due to lack of angiogenesis.
  • Artificial cartilage from MSCs can induce angiogenesis and bone formation via endochondral ossification (ECO).
  • Clinical application requires scalable cartilage grafts that integrate when implanted in pieces.

Purpose of the Study:

  • To evaluate hyaluronic acid (HA) hydrogels as scaffolds for MSC-based cartilage tissue engineering.
  • To assess the potential of HA hydrogels to promote endochondral ossification and bone formation in vivo.
  • To determine if HA hydrogels meet clinical requirements for large bone defect regeneration.

Main Methods:

  • Fabrication of hyaluronic acid (HA) hydrogels.
  • In vitro culture of MSCs within HA hydrogels to form cartilage tissue.
  • In vivo implantation of HA hydrogel-based cartilage to evaluate bone formation via ECO.

Main Results:

  • HA hydrogels effectively supported MSC differentiation into cartilage in vitro.
  • Implanted HA hydrogel-based cartilage promoted angiogenesis and endochondral ossification in vivo.
  • The HA hydrogel scaffold facilitated bone formation, demonstrating potential for clinical application.

Conclusions:

  • Hyaluronic acid hydrogels are suitable scaffolds for generating MSC-based cartilage tissue.
  • HA hydrogels promote endochondral ossification and bone regeneration in vivo.
  • This ECO-mediated approach using HA hydrogels shows promise for treating critical-sized bone defects.