Ceramide inhibits CCN2 expression in fibroblasts.
Laura Kennedy1, Sunil Parapuram, Jill Greenspoon
1CIHR Group in Skeletal Development and Remodeling, Division of Oral Biology and Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Dental Sciences Building, University of Western Ontario, London, ON, N6A 5C1, Canada.
Journal of Cell Communication and Signaling
|July 24, 2008
Summary
C2 ceramide inhibits TGFbeta-induced connective tissue growth factor (CTGF) production in fibroblasts. This suggests C2 ceramide acts as a Smad antagonist, reducing TGFbeta signaling pathways.
Area of Science:
- Cell biology
- Molecular biology
- Biochemistry
Background:
- Connective tissue growth factor (CTGF, also known as CCN2) is a key mediator in cellular processes.
- CTGF expression is typically induced by transforming growth factor-beta (TGFbeta) in fibroblast cells.
- Understanding the regulation of CTGF is crucial for studying fibrotic diseases.
Purpose of the Study:
- To investigate the effect of C2 ceramide on TGFbeta-induced CTGF production in fibroblasts.
- To determine the mechanism by which C2 ceramide influences TGFbeta signaling.
Main Methods:
- Fibroblast cell cultures were treated with TGFbeta and C2 ceramide.
- Quantitative analysis of CCN2 protein and mRNA levels was performed.
- Reporter gene assays using a Smad-responsive promoter (SBE-luciferase) were conducted.
Main Results:
- C2 ceramide significantly reduced TGFbeta-induced CCN2 protein levels.
- C2 ceramide also decreased TGFbeta-induced CCN2 mRNA expression.
- The ability of TGFbeta to activate a Smad-responsive promoter was inhibited by C2 ceramide.
Conclusions:
- C2 ceramide antagonizes TGFbeta-induced CCN2 production in fibroblasts.
- The mechanism involves the inhibition of Smad signaling pathways.
- C2 ceramide may represent a therapeutic target for conditions involving excessive TGFbeta signaling.
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