RRC ID 41807
Author Yamaguchi T, Okada T, Takeuchi K, Tonda T, Ohtaki M, Shinoda S, Masuzawa T, Ozawa K, Inaba T.
Title Enhancement of thymidine kinase-mediated killing of malignant glioma by BimS, a BH3-only cell death activator.
Journal Gene Ther.
Abstract Herpes simplex virus thymidine kinase (HSV-tk)/gancyclovir (GCV) therapy has the ability to inhibit tumor formation in animal models but the results of clinical trials have been disappointing. To improve the performance of tk/GCV therapy, we tried combination therapy designed to enhance its cytotoxic effects by introducing genes that induce apoptosis of the tumor cells through different pathways. We concentrated our efforts on the use of Bim, a BH3-only member of death activators in the Bcl-2 superfamily, because Bim is not involved in the pathways through which HSV-tk/GCV therapy induces apoptosis in malignant glioma cells. Among three alternative splicing variants, BimEL, BimL, and BimS, BimS lacks the binding domain for the dynein light chain LC8, which negatively regulates the proapoptotic function of BimEL and BimL. All four malignant glioma cell lines, U251, A172, T-430, and U373 underwent cell death after transfer of BimS using an adenovirus vector (AVC2). Intriguingly, combination of AVC2-BimS with AVC2-tk markedly increased the sensitivity of U251 cells to GCV both in vitro and in vivo. In contrast, AVC2-BimL did not induce significant cell death. These results indicated that BimS had the ability to improve the efficiency of HSV-tk/GCV therapy in the treatment of malignant glioma and suggested that the targeting of different proapoptotic pathways may be a useful strategy for the development of an effective gene therapy approach to treatment.
Volume 10(5)
Pages 375-85
Published 2003-3
DOI 10.1038/sj.gt.3301897
PII 3301897
PMID 12601392
MeSH Adenoviridae / genetics Animals Antiviral Agents / therapeutic use Apoptosis / genetics* Brain Neoplasms / therapy* Combined Modality Therapy Female Ganciclovir / therapeutic use Genetic Therapy / methods* Genetic Vectors / administration & dosage Genetic Vectors / genetics Glioma / therapy* Humans Mice Mice, Inbred BALB C Simplexvirus / enzymology* Thymidine Kinase / genetics* Transduction, Genetic / methods Tumor Cells, Cultured
IF 3.203
Times Cited 15
Human and Animal Cells