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Differentiating Chondrocytes from Peripheral Blood-derived Human Induced Pluripotent Stem Cells
Published on: July 18, 2017
Cartilage tissue formation using redifferentiated passaged chondrocytes in vitro
Nazish Ahmed1, Lu Gan, Andras Nagy
1CIHR-BioEngineering of Skeletal Tissues Team, Mount Sinai Hospital, University of Toronto, Toronto, Canada.
Tissue Engineering. Part A
|September 12, 2008
Summary
Redifferentiated chondrocytes (P2) from cartilage tissue engineering maintain their beneficial properties. This coculture method expands functional cells for cartilage repair, avoiding joint replacement.
Area of Science:
- Regenerative Medicine
- Biomaterials Science
- Cell Biology
Background:
- Articular cartilage has limited self-repair capacity, leading to osteoarthritis and pain.
- Current treatments include synthetic implants, but biological solutions are sought.
- Generating sufficient chondrocytes for tissue engineering is challenging due to sparse native tissue cell density.
Purpose of the Study:
- To investigate if redifferentiation of passaged chondrocytes (P2) induced by coculture with primary chondrocytes (P0) is a stable and functional state.
- To determine if these redifferentiated chondrocytes can be expanded and maintain their cartilage-forming potential.
- To assess the feasibility of this coculture system for generating sufficient cells for cartilage tissue engineering.
Main Methods:
- Coculture of dedifferentiated chondrocytes (P2) with primary chondrocytes (P0).
- Separation of redifferentiated P2 cells (dP2) using flow-associated cell sorting.
- Culture of dP2 cells alone and assessment of cartilage tissue formation.
- Analysis of tissue composition (type II collagen, proteoglycan) and gene expression (collagen types I and II).
Main Results:
- Redifferentiated P2 cells (dP2) formed thicker cartilage tissue with increased proteoglycan accumulation compared to P2 cells.
- dP2 cells demonstrated higher type II collagen and lower type I collagen gene expression.
- Redifferentiated dP2 cells retained the ability to induce redifferentiation in P2 cells, similar to primary P0 cells.
- The redifferentiation was not transient, with dP2 cells maintaining cartilage-specific markers after further culture.
Conclusions:
- Redifferentiated passaged chondrocytes exhibit stable, primary chondrocyte-like behavior under appropriate culture conditions.
- This coculture system offers a novel strategy to significantly increase the number of functional chondrocytes for cartilage tissue engineering.
- The approach holds promise for developing biological surface replacements and avoiding total joint replacement.
