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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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Growth of Cartilage and Bone Tissue01:27

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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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Bone Formation by Intramembranous Ossification01:29

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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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Related Experiment Video

Updated: Oct 1, 2025

Author Spotlight: Enhancing Bone Regeneration with Vascularized Artificial Cartilage Integration
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Engineering pre-vascularized bone-like tissue from human mesenchymal stem cells through simulating endochondral

Zixuan Lin1, Xiurui Zhang2, Madalyn R Fritch1

  • 1Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, 15219, USA.

Biomaterials
|March 8, 2022
PubMed
Summary

Engineered bone tissues with pre-formed blood vessels show improved integration and bone formation after implantation. This approach enhances vascularization for better repair of large bone defects.

Keywords:
Bone tissue engineeringEndochondral ossificationHuman mesenchymal stem cellsHuman umbilical vein endothelial cellsVascularization

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Use of Human Perivascular Stem Cells for Bone Regeneration
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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Engineered bone tissues often lack integrated vascular systems, relying on host angiogenesis which is insufficient for large defects.
  • Pre-implantation vascularization is crucial for the survival and integration of engineered bone grafts.
  • Simulating developmental processes like endochondral ossification can guide tissue formation.

Purpose of the Study:

  • To create pre-vascularized bone-like tissue using human bone marrow-derived mesenchymal stem cells (HBMSCs) and human umbilical vein endothelial cells (HUVECs).
  • To assess the in vivo integration and bone formation capacity of these pre-vascularized constructs after subcutaneous implantation in mice.
  • To evaluate the potential of this approach for repairing large bone defects.

Main Methods:

  • HBMSCs were cultured to form bone-like extracellular matrix, mimicking endochondral ossification.
  • A 3D co-culture of HUVECs and HBMSCs was used to pre-vascularize the bone-like constructs.
  • Pre-vascularized constructs were implanted subcutaneously in mice, with assessment of vascularization and bone formation markers after 28 days.

Main Results:

  • The procedure promoted robust osteogenic differentiation of HBMSCs and in vitro network formation of HUVECs/HBMSCs.
  • Implanted pre-vascularized constructs showed significantly more functional blood vessels compared to controls.
  • Increased bone formation and resorption markers were observed in the pre-vascularized bone-like constructs.

Conclusions:

  • Pre-vascularized bone-like constructs facilitate integration with host vasculature and enhance bone formation.
  • This developmentally informed strategy shows promise for improving the repair of critical-sized bone defects.
  • Pre-formed vascular networks are essential for the success of engineered bone tissue grafts.