Selective targeting and inducible destruction of human cancer cells by retroviruses with envelope proteins bearing short peptide ligands
Biochemistry & Molecular Pharmacology
Graduate School of Biomedical Sciences; Programs in Gene Function and Expression and in Molecular Medicine
Medical Subject Headings
Amino Acid Sequence; Antiviral Agents; Cell Line; Ganciclovir; Gastrin-Releasing Peptide; Gene Targeting; Genetic Vectors; Humans; Ligands; Molecular Sequence Data; Moloney murine leukemia virus; Peptides; Receptor, Epidermal Growth Factor; Recombinant Fusion Proteins; Recombination, Genetic; Retroviridae; Transduction, Genetic; Viral Envelope Proteins
Life Sciences | Medicine and Health Sciences
In the accompanying study, we show how retroviral tropism can be redirected by insertion of short peptide ligands at multiple locations in envelope. Here we use this approach to selectively target and destroy human cancer cells. Many cancer cells overexpress specific cell surface receptors. We have generated Moloney murine leukemia virus (MLV) envelope derivatives bearing short peptide ligands for gastrin-releasing protein (GRP) and human epidermal growth factor receptors. Pseudotyped viruses containing these chimeric envelope derivatives selectively transduce human cancer cell lines that overexpress the cognate receptor. A retrovirus targeting the GRP receptor can deliver the thymidine kinase gene to human melanoma and breast cancer cells, which are killed by the subsequent addition of ganciclovir. Collectively, our results demonstrate that short peptide ligands inserted at appropriate locations in MLV envelope can selectively target retroviruses to human cancer cells and deliver a therapeutically relevant gene.
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Citation: J Virol. 2002 Apr;76(7):3564-9.