L-buthionine-sulfoximine-mediated radiosensitization in experimental interstitial radiotherapy of intracerebral D-54 MG glioma xenografts in athymic mice.
An intracranial (i.c.) interstitial radiotherapy model in athymic nude mice bearing i.c. D-54 MG human glioma xenografts was developed, allowing evaluation of the therapeutic benefits seen after L-buthionine-S,R-sulfoximine (L-BSO)-mediated depletion of tumor glutathione levels. Administration of L-BSO [2.5 mmol/kg intraperitoneal injections x 4 doses plus concomitant availability in acidified (pH 3.0) drinking water at a concentration of 20 mM] resulted in depletion of tumor glutathione levels to 0.15 mumol/g wet weight (7.9% of control). The therapeutic activity of i.c. interstitial radiotherapy with an 125I seed was enhanced after L-BSO-mediated glutathione depletion, with increases in median survival of 13.4 to 30.5% over that seen with 125I seeds alone. These studies demonstrate a potential role for BSO in enhancing the therapeutic activity of interstitial radiotherapy.
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Related Subject Headings
- Radiation-Sensitizing Agents
- Neurology & Neurosurgery
- Neoplasm Transplantation
- Mice, Nude
- Mice, Inbred BALB C
- Mice
- Methionine Sulfoximine
- Male
- Glioma
- Buthionine Sulfoximine
Citation
Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- Radiation-Sensitizing Agents
- Neurology & Neurosurgery
- Neoplasm Transplantation
- Mice, Nude
- Mice, Inbred BALB C
- Mice
- Methionine Sulfoximine
- Male
- Glioma
- Buthionine Sulfoximine