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Wild-type p53 induction mediated by replication-deficient adenoviral vectors
C R McPake1, S Shetty, G R Kitchingman
1Department of Molecular Pharmacology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.
Cancer Research
|September 15, 1999
Summary
Replication-deficient adenoviral vectors can increase p53 protein levels in cells. This vector-induced p53 is transcriptionally active, potentially impacting gene therapy outcomes.
Area of Science:
- Molecular Biology
- Gene Therapy
- Virology
Background:
- Replication-deficient adenoviral vectors (E1-/E3-deleted) are widely used for gene delivery in vitro and in vivo gene therapy.
- Adenoviral vectors can influence cellular processes beyond transgene delivery.
Purpose of the Study:
- To investigate the effect of adenoviral vector transduction on p53 expression.
- To characterize the mechanism and functional consequences of vector-induced p53.
Main Methods:
- Transduction of cells with replication-deficient adenoviral vectors.
- Western blot analysis to detect p53 protein levels.
- Immunoprecipitation assays with 35S-labeled amino acids to assess protein synthesis rates.
- Assessment of p53 transcriptional activity.
Main Results:
- Adenoviral vector transduction induced p53 expression in cells with wild-type p53.
- The induction kinetics were slower than DNA damage-induced p53 and occurred in cells with attenuated DNA damage response.
- Vector-induced p53 was transcriptionally active.
- Increased p53 protein levels were observed due to enhanced translation, not altered degradation.
Conclusions:
- Adenoviral vectors can induce p53 expression through increased protein translation.
- This vector-induced p53 is functional and can influence cellular outcomes like apoptosis and chemosensitivity.
- The impact of adenoviral vectors on p53 may confound gene therapy applications by altering the cellular environment.