How TNF-α and Retinoic Acid Affect Cartilage Gene Expression
Author Information
Author(s): Rockel Jason S, Kudirka Julie C, Guzi Andrew J, Bernier Suzanne M
Primary Institution: Schulich School of Medicine & Dentistry, The University of Western Ontario
Hypothesis
How do TNF-α and retinoic acid alter the expression of cartilage matrix genes?
Conclusion
TNF-α and retinoic acid reduce Sox9 activity and cartilage matrix gene expression, likely by limiting p300 availability.
Supporting Evidence
- TNF-α and atRA together reduced cartilage matrix gene expression more than either factor alone.
- Over-expression of p300 restored Sox9 activity suppressed by TNF-α and atRA.
- AtRA reduced NF-κB activity and DNA binding.
Takeaway
This study shows that two substances, TNF-α and retinoic acid, can make it harder for cartilage cells to produce important proteins, which could be a problem for joint health.
Methodology
Rat chondrocytes were treated with TNF-α and/or retinoic acid, and gene expression was analyzed using Northern blot and quantitative real-time PCR.
Limitations
The study primarily uses rat chondrocytes, which may not fully represent human cartilage biology.
Participant Demographics
Primary cultures from 1-day-old Sprague Dawley rats.
Statistical Information
P-Value
p<0.03
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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