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The induction of CCN2 by TGFbeta1 involves Ets-1.
Jonathan P Van Beek1, Laura Kennedy, Jason S Rockel
1CIHR Group in Skeletal Development and Remodeling, Schulich School of Medicine and Dentistry, Dental Sciences Building, The University of Western Ontario, London, ON N6A 5C1, Canada.
Arthritis Research & Therapy
|February 14, 2006
Summary
Cellular communication factor CCN2 (Connective tissue growth factor) is regulated by ETS factors, impacting diseases like cancer and fibrosis. Targeting ETS-1 may offer therapeutic benefits by controlling CCN2 expression.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- CCN2 (Connective tissue growth factor) is an immediate-early gene crucial for blood vessel, bone, and connective tissue formation.
- CCN2 plays significant roles in cell adhesion, migration, and matrix remodeling.
- Overexpression of CCN2 is linked to pathologies such as fibrosis, arthritis, and cancer, highlighting the need to control its expression.
Purpose of the Study:
- To elucidate the regulatory mechanisms of CCN2 gene expression.
- To investigate the role of the GAGGAATG promoter sequence in CCN2 regulation.
- To determine the involvement of ETS transcription factors and Smad3 in CCN2 activation.
Main Methods:
- Analysis of the CCN2 promoter sequence, specifically the GAGGAATG element.
- Investigation of ETS family transcription factor binding and activation.
- Use of dominant-negative Ets-1 and small interfering RNA (siRNA) to block CCN2 induction.
- Examination of Ets-1 and Smad3 cooperation in CCN2 promoter activation.
- Assessment of protein kinase C (PKC) involvement in Ets-1 mediated activation.
Main Results:
- The GAGGAATG promoter sequence mediates CCN2 promoter activation by ETS transcription factors.
- Endogenous Ets-1 binds to the CCN2 promoter's GAGGAATG element.
- Inhibition of Ets-1 function blocks TGF-beta-induced CCN2 expression.
- Ets-1 synergizes with Smad3 to activate the CCN2 promoter independently of TGF-beta1.
- Smad3 co-expression bypasses the requirement for PKC in Ets-1-mediated CCN2 promoter activation.
Conclusions:
- Smad3 and Ets-1 cooperate to induce CCN2 promoter activity, particularly in response to TGF-beta1.
- Targeting Ets-1 presents a potential therapeutic strategy for reducing CCN2 expression in diseases like fibrosis, arthritis, and cancer.