MLH1 deficiency enhances tumor cell sensitivity to ganciclovir
| Autor: | Donna S. Shewach, Thomas E. Wilson, Paul D. Boucher, Jessica J. O’Konek, Anthony A. Iacco |
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| Rok vydání: | 2009 |
| Předmět: |
Ganciclovir
Cancer Research Cell Survival ganciclovir viruses Saccharomyces cerevisiae Ribonucleotide reductase inhibitor Biology DNA Mismatch Repair Article stomatognathic system Cell Line Tumor medicine Humans RNA Small Interfering Cytotoxicity Molecular Biology Adaptor Proteins Signal Transducing MLH1 virus diseases Nuclear Proteins Genetic Therapy Mismatch Repair Protein biochemical phenomena metabolism and nutrition Suicide gene digestive system diseases mismatch repair Thymidine kinase Colonic Neoplasms Cancer research Molecular Medicine DNA mismatch repair Glioblastoma MutL Protein Homolog 1 Homologous recombination DNA Damage medicine.drug |
| Zdroj: | Cancer gene therapy |
| ISSN: | 1476-5500 0929-1903 |
| Popis: | Suicide gene therapy with herpes simplex virus thymidine kinase and ganciclovir is notable for producing multi-log cytotoxicity in a unique pattern of delayed cytotoxicity in S-phase. Because hydroxyurea, a ribonucleotide reductase inhibitor that activates mismatch repair, can increase sensitivity to ganciclovir, we evaluated the role of MLH1, an essential mismatch repair protein, in ganciclovir cytotoxicity. Using HCT116TK (HSV-TK-expressing) colon carcinoma cells that express or lack MLH1, cell survival studies demonstrated greater ganciclovir sensitivity in the MLH1 deficient cells, primarily at high concentrations. This could not be explained by differences in ganciclovir metabolism, as the less sensitive MLH1-expresssing cells accumulated more ganciclovir triphosphate and incorporated more of the analog into DNA. SiRNA suppression of MLH1 in U251 glioblastoma or SW480 colon carcinoma cells also enhanced sensitivity to high concentrations of ganciclovir. Studies in a panel of yeast deletion mutants confirmed the results with MLH1, and further suggested a role for homologous recombination repair and several cell cycle checkpoint proteins in ganciclovir cytotoxicity. These data suggest that MLH1 can prevent cytotoxicity with ganciclovir. Targeting mismatch repair-deficient tumors may increase efficacy of this suicide gene therapy approach to cancer treatment. |
| Databáze: | OpenAIRE |
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