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Related Concept Videos

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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Treatment of Osteochondral Defects in the Rabbit's Knee Joint by Implantation of Allogeneic Mesenchymal Stem Cells in Fibrin Clots
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Scaffold-Free Osteochondral Engineering Using Embryonic-Derived Mesenchymal Stem Cell Spheroids.

Shawn P Grogan1, Nicholas E Glembotski1, Erik W Dorthé1

  • 1Scripps Health, Shiley Center for Orthopaedic Research and Education at Scripps Clinic, La Jolla, California, USA.

Tissue Engineering. Part A
|August 7, 2025
PubMed
Summary

Embryonic stem cell-derived mesenchymal stem cell spheroids in a closed chamber system create scaffold-free cartilage and bone graft tissues. This method shows promise for cartilage repair and engineering osteochondral tissues.

Keywords:
cartilagecellular spheroidsosteochondralscaffold free

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Area of Science:

  • Regenerative Medicine
  • Tissue Engineering
  • Stem Cell Biology

Background:

  • Cartilage defects and osteochondral injuries pose significant clinical challenges.
  • Current tissue engineering strategies often rely on scaffolds, which can have limitations.
  • Developing scaffold-free approaches using cellular spheroids offers a promising alternative.

Purpose of the Study:

  • To investigate the potential of embryonic stem cell-derived mesenchymal stem cell (ES-MSC) spheroids within a closed chamber system for creating scaffold-free cartilage and endochondral grafts.
  • To evaluate the efficacy of these engineered tissues for cartilage repair and osteochondral regeneration.

Main Methods:

  • ES-MSC spheroids were cultured in chondrogenic or osteogenic media and then seeded into a customizable Net Mold Chamber System (NCS).
  • Constructs were cultured for varying durations to promote cartilage or osteochondral tissue formation.
  • Engineered cartilage was implanted into ex vivo human cartilage defects to assess repair potential.
  • Osteochondral constructs were analyzed for cartilage and bone matrix production.

Main Results:

  • NCS-cultured ES-MSC spheroids formed neocartilage tissues expressing key cartilage markers (COL2A1, ACAN, COMP) and matrix molecules.
  • Implanted cartilage constructs integrated with ex vivo osteoarthritic tissue, showing a significant elastic modulus.
  • Osteogenic cultures produced mineralized tissues positive for osteopontin.
  • Combined chondrogenic and osteogenic cultures in stacked NCS chambers yielded osteochondral neotissues up to 2 mm thick.

Conclusions:

  • Scaffold-free cartilage and osteochondral graft tissues can be engineered using ES-MSC spheroids in a closed chamber system.
  • This approach demonstrates potential for generating clinically relevant graft tissues for cartilage repair and osteochondral regeneration.
  • The use of ES-MSC spheroids in NCS offers a promising scaffold-free strategy for regenerative medicine applications.