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Related Concept Videos

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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Bone Formation by Endochondral Ossification01:24

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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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Hyperplastic Human Macromass Cartilage for Joint Regeneration.

Ya Wen1,2,3, Yishan Chen1,2,3, Weiliang Wu4

  • 1Dr. Li Dak Sum & Yip Yio Chin Center for Stem Cells and Regenerative Medicine, and Department of Orthopedic Surgery of the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, 310058, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|July 3, 2023
PubMed
Summary
This summary is machine-generated.

This study developed an expandable human macro-cartilage tissue engineering strategy using a novel customized culture medium. This method enhances chondrocyte expansion and differentiation, creating large, hyaline-like cartilage grafts for joint repair.

Keywords:
cell plasticitycustomized expansionjoint regenerationmacromass cartilage

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Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Cartilage damage is a prevalent global health issue, necessitating effective tissue repair strategies.
  • Current tissue engineering approaches struggle to produce sufficient cartilage grafts that maintain both size and phenotype.
  • The inability of engineered cartilage to grow in size while preserving chondrogenic characteristics limits its clinical applicability.

Purpose of the Study:

  • To develop a novel step-wise strategy for fabricating expandable human macro-cartilage tissues.
  • To enhance the expansion and differentiation capabilities of human chondrocytes for cartilage repair.
  • To create large-sized, off-the-shelf cartilage analogs with hyaline-like properties.

Main Methods:

  • Utilized human polydactyly chondrocytes and a screen-defined, serum-free customized culture (CC) medium.
  • Employed a 3D culture system to promote the formation of macro-cartilage tissues.
  • Conducted transcriptomic analysis to elucidate the underlying cellular mechanisms of proliferation and differentiation.
  • Evaluated the in vivo efficacy of the engineered macro-cartilage in animal models of cartilage defects.

Main Results:

  • CC-induced chondrocytes exhibited a 14.59-fold expansion while maintaining chondrogenic potential.
  • Fabricated macro-cartilage tissues reached an average diameter of 3.25 ± 0.05 mm with homogenous matrix and intact structure.
  • Cell yield increased 2.57-fold, and collagen type II expression increased 4.70-fold compared to standard culture.
  • In vivo studies demonstrated that CC macro-cartilage maintained a hyaline-like phenotype and promoted significant cartilage defect healing.

Conclusions:

  • The developed step-wise strategy enables efficient expansion of human macro-cartilage with superior regenerative plasticity.
  • This approach overcomes limitations of current methods by allowing simultaneous size growth and phenotype maintenance.
  • The engineered macro-cartilage shows significant promise as an off-the-shelf solution for joint regeneration and cartilage repair.