Related Experiment Videos
Cell growth inhibition by prostaglandin A2 results in elevated expression of gadd153 mRNA
A M Choi1, J Fargnoli, S G Carlson
1Laboratory of Molecular Genetics, National Institute on Aging, Baltimore, Maryland 21224.
Abstract:
Treatment of Hela cells with prostaglandin A2 (PGA2) resulted in a marked inhibition of cell proliferation which was associated with a significant induction of gadd153 mRNA, a member of a novel class of genes associated with growth arrest and DNA damage. Induction of gadd153 mRNA was specific to prostaglandins capable of arresting cell growth and was dose-dependent with the maximum effect seen at 36 microM PGA2. Induction was rapid, occurring within 2-4 h and reaching a maximum by 8 h. These effects were reversible as removal of PGA2 resulted in a rapid decline in gadd153 mRNA levels coincident with resumption of cell growth. PGA2 induction of gadd153 mRNA was completely prevented by the presence of actinomycin D at a concentration sufficient to block transcription and was partially inhibited (50%) by the protein synthesis inhibitor cycloheximide. The presence of the protein kinase inhibitor 2-aminopurine decreased the PGA2 induction of gadd153 mRNA by greater than 90%, suggesting that cellular kinases play a role in the induction of gadd153 by PGA2. Thus PGA2-mediated growth arrest provides a useful model to further define the role of gadd153 in the negative control of cell growth.
Insights
Prostaglandin A2 (PGA2) inhibits HeLa cell proliferation by inducing gadd153 mRNA, a gene linked to growth arrest. This effect is dose-dependent, rapid, reversible, and involves cellular kinases.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Prostaglandin A2 (PGA2) is known to affect cellular processes.
- The gadd153 gene is associated with growth arrest and DNA damage.
- Understanding the regulation of cell growth is crucial in biology and medicine.
Purpose of the Study:
- To investigate the effect of Prostaglandin A2 (PGA2) on cell proliferation and gadd153 gene expression in HeLa cells.
- To elucidate the molecular mechanisms underlying PGA2-mediated growth arrest and gadd153 induction.
Main Methods:
- Treatment of HeLa cells with varying concentrations of PGA2.
- Measurement of gadd153 mRNA levels using quantitative methods.
- Assessment of the role of transcription, protein synthesis, and kinases using specific inhibitors (Actinomycin D, Cycloheximide, 2-aminopurine).
Main Results:
- PGA2 significantly inhibited HeLa cell proliferation and induced gadd153 mRNA expression in a dose-dependent and time-dependent manner.
- The induction of gadd153 mRNA by PGA2 was reversible upon removal of the drug.
- PGA2 induction of gadd153 mRNA was dependent on transcription and protein synthesis, and strongly mediated by cellular kinases.
Conclusions:
- PGA2-induced growth arrest in HeLa cells is closely associated with the rapid induction of gadd153 mRNA.
- Cellular kinases play a critical role in the signaling pathway leading to gadd153 induction by PGA2.
- PGA2-mediated growth arrest serves as a valuable model for studying the function of gadd153 in regulating cell growth.