Late expression of p53 from a replicating adenovirus improves tumor cell killing and is more tumor cell specific than expression of the adenoviral death protein.

Abstract

Gene transfer of p53 induces cell death in most cancer cells, and replication-defective adenoviral vectors expressing p53 are being evaluated in clinical trials. However, low transduction efficiency limits the efficacy of replication-defective vector systems for cancer therapy. The use of replication-competent vectors for gene delivery may have several advantages, holding the potential to multiply and spread the therapeutic agent after infection of only a few cells. However, expression of a transgene may adversely affect viral replication. We have constructed a replicating adenoviral vector (Adp53rc) that expresses high levels of p53 at a late time point in the viral life cycle and also contains a deletion of the adenoviral death protein (ADP). Adp53rc-infected cancer cells demonstrated high levels of p53 expression in parallel with the late expression pattern of the adenoviral fiber protein. p53 expression late in the viral life cycle did not impair effective virus propagation. Survival of several lung cancer cell lines was significantly diminished after infection with Adp53rc, compared with an identical p53-negative control virus. p53 expression also improved virus release and spread. Interestingly, p53 was more cytotoxic than the ADP in cancer cells but less cytotoxic than the ADP in normal cells. In conclusion, late expression of p53 from a replicating virus improves tumor cell killing and viral spread without impairing viral replication. In addition, in combination with a deletion of the ADP, specificity of tumor cell killing is improved.

• Authors: Harald Sauthoff, Teona Pipiya, Sheila Heitner, Shu Chen, Robert G Norman, William N Rom, John G Hay
• Journal: Human gene therapy (Hum Gene Ther) Vol. 13 Issue 15 Pg. 1859-71 (Oct 10 2002) ISSN: 1043-0342 [Print] United States
• PMID: 12396618 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Adenovirus E3 Proteins
• Recombinant Fusion Proteins
• Tumor Suppressor Protein p53
• adenovirus death protein, Adenovirus

Topics

• Adenoviridae (genetics, physiology)
• Adenovirus E3 Proteins (physiology)
• Apoptosis
• Carcinoma, Non-Small-Cell Lung (pathology)
• Carcinoma, Squamous Cell (pathology)
• Cell Nucleus (metabolism)
• Cells, Cultured
• Cytopathogenic Effect, Viral
• Fibroblasts (cytology)
• Gene Expression Regulation, Viral
• Genes, p53
• Genetic Vectors (genetics, physiology)
• Lung Neoplasms (pathology)
• Recombinant Fusion Proteins (biosynthesis, physiology)
• Tumor Cells, Cultured
• Tumor Suppressor Protein p53 (biosynthesis, physiology)
• Virus Replication