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A 3D System for Culturing Human Articular Chondrocytes in Synovial Fluid
Published on: January 31, 2012
Comparison of gene expression profile between human chondrons and chondrocytes: a cDNA microarray study
1Department of Biomedical Engineering, Johns Hopkins University, 3400 N. Charles Street, Clark Hall 102, Baltimore, MD 21218, USA. zhangzj@jhu.edu
Osteoarthritis and Cartilage
|January 18, 2006
Summary
The pericellular matrix (PCM) surrounding chondrocytes in articular cartilage significantly alters chondrocyte gene expression. This matrix influences heat shock protein production and may stabilize chondrocyte phenotype.
Area of Science:
- Biochemistry
- Cell Biology
- Biomaterials Science
Background:
- The chondron, comprising a chondrocyte and its pericellular matrix (PCM), is the fundamental unit of articular cartilage.
- Understanding the chondron's influence on chondrocyte function is crucial for cartilage biology and osteoarthritis research.
Purpose of the Study:
- To investigate the impact of the chondron's pericellular matrix (PCM) on the gene expression profile of chondrocytes.
- To elucidate how the structural integrity of the chondron affects chondrocyte behavior.
Main Methods:
- Enzymatic isolation of chondrons and chondrocytes from human articular cartilage.
- Pellet culture of isolated chondrons and chondrocytes.
- cDNA microarray analysis at days 1, 3, and 5 to assess gene expression profiles.
Main Results:
- Chondrons exhibited significant differential gene expression compared to isolated chondrocytes, with 258 genes affected across three time points.
- Gene expression changes included upregulation of heat shock proteins (e.g., HSPA1A, HSPA2, HSPA8) and downregulation of genes associated with hypertrophy and dedifferentiation (e.g., SSP1, DCN).
- Real-time RT-PCR confirmed the upregulation of specific heat shock proteins in chondrons.
Conclusions:
- The pericellular matrix (PCM) profoundly influences chondrocyte gene expression within the chondron.
- Upregulation of heat shock proteins may enhance chondron robustness and matrix production.
- An intact PCM appears to stabilize the chondrocyte phenotype, maintaining cartilage homeostasis.
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