Related Experiment Videos
CTGF modulates cell cycle progression in cAMP-arrested NRK fibroblasts
D Kothapalli1, G R Grotendorst
1Department of Cell Biology, University of Miami School of Medicine, Miami, Florida, USA.
Journal of Cellular Physiology
|November 24, 1999
Summary
Connective tissue growth factor (CTGF) drives fibroblast proliferation by increasing cyclin A and reducing p27(Kip1) levels. This process, mediated by transforming growth factor beta (TGF-beta), regulates cell cycle progression in suspension cultures.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Connective tissue growth factor (CTGF) is induced by transforming growth factor beta (TGF-beta) in connective tissue cells.
- CTGF acts as a downstream mediator of TGF-beta's mitogenic activity, controlling fibroblast cell cycle progression.
Purpose of the Study:
- To elucidate the molecular mechanism by which CTGF induces S-phase entry in NRK fibroblast suspension cultures.
- To investigate CTGF's role in regulating cell cycle progression and proliferation.
Main Methods:
- Analysis of CTGF's effect on cell cycle regulators in NRK fibroblasts.
- Measurement of cyclin A, p27(Kip1), pRb phosphorylation, and E2F activity.
- Utilizing fibroblast suspension cultures to study proliferation.
Main Results:
- CTGF upregulates cyclin A levels, promoting S-phase entry.
- CTGF reduces p27(Kip1) levels, leading to pRb hyperphosphorylation and E2F release.
- These events collectively mediate CTGF's role in fibroblast proliferation.
Conclusions:
- CTGF acts as a key mediator of TGF-beta-induced fibroblast proliferation in suspension.
- CTGF regulates cell cycle progression by modulating cyclin A and p27(Kip1) levels.
- The findings highlight CTGF's role in controlling cell division through cyclin-dependent kinase (cdk) activities.