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Experimental therapy of human glioma by means of a genetically engineered virus mutant
R L Martuza1, A Malick, J M Markert
1Molecular Neurogenetics Laboratory, Harvard Medical School, Massachusetts General Hospital-East, Charlestown 02129.
Abstract:
Malignant gliomas are the most common malignant brain tumors and are almost always fatal. A thymidine kinase-negative mutant of herpes simplex virus-1 (dlsptk) that is attenuated for neurovirulence was tested as a possible treatment for gliomas. In cell culture, dlsptk killed two long-term human glioma lines and three short-term human glioma cell populations. In nude mice with implanted subcutaneous and subrenal U87 human gliomas, intraneoplastic inoculation of dlsptk caused growth inhibition. In nude mice with intracranial U87 gliomas, intraneoplastic inoculation of dlsptk prolonged survival. Genetically engineered viruses such as dlsptk merit further evaluation as novel antineoplastic agents.
Insights
A genetically engineered herpes simplex virus-1 (dlsptk) showed promise in treating malignant gliomas. This virus inhibited glioma growth in cell cultures and animal models, suggesting its potential as a novel cancer therapy.
Area of Science:
- Neuro-oncology
- Virology
- Oncolytic virus therapy
Background:
- Malignant gliomas represent the most prevalent and fatal type of brain tumor.
- Current treatment options for malignant gliomas have limited efficacy.
Purpose of the Study:
- To evaluate the efficacy of a thymidine kinase-negative mutant of herpes simplex virus-1 (dlsptk) as a potential treatment for malignant gliomas.
Main Methods:
- Testing dlsptk against human glioma cell lines in vitro.
- Assessing the effect of dlsptk on U87 human gliomas implanted in nude mice (subcutaneous, subrenal, and intracranial models).
Main Results:
- dlsptk demonstrated direct cytotoxicity against human glioma cell lines in culture.
- Intratumoral inoculation of dlsptk led to growth inhibition of subcutaneous and subrenal gliomas in nude mice.
- Intracranial gliomas in nude mice showed prolonged survival following dlsptk treatment.
Conclusions:
- The genetically engineered virus dlsptk exhibits significant anti-glioma activity.
- dlsptk warrants further investigation as a potential oncolytic agent for malignant gliomas.