Document Detail

In vitro biological dosimeter modeling of the glioblastoma response to radiation delivered by the Gamma Knife. Laboratory investigation.
MedLine Citation:
PMID:  21121805     Owner:  NLM     Status:  MEDLINE    
OBJECT: The goal of this study was to develop an assay that makes possible the assessment of the glioma cell response to single-fraction high-dose Gamma Knife surgery. In this assay, the isolation of radioresistant cell subpopulations facilitates mechanistic studies of radioresistance.
METHODS: A tissue-equivalent paraffin phantom with an aperture capable of holding an Opticell cell culture cassette was developed for treatment with the Leksell Gamma Knife model C. A second apparatus, which the authors also created, uses the manufacturer-supplied polystyrene phantom, thereby allowing this assay to be performed in the Leksell Gamma Knife Perfexion. After treatment, the cells were morphologically assessed to determine their response to radiation treatment. Two specific parameters were used to determine radiosensitivity: 1) the diameter of the clearing zone, defined as the central region of cell death; and 2) the number of surviving colonies within this central high-dose clearing zone.
RESULTS: Radioresistance was compared in 2 different cell lines from glioblastomas. The first cell line, ME, was established from a primary tumor before its treatment, and the second cell line, DIV, was established from a tumor that recurred after treatment with chemotherapy and fractionated radiotherapy. The ME cell line had the most robust response to radiosurgery, as characterized by a consistently larger clearing zone (28.33 ± 1.1 mm). In contrast, the clearing zone produced when the DIV cell line was used was 24.0 ± 1 mm, indicating an approximate response difference of 5 Gy. The mean number of surviving colonies within the clearing zone for the ME cell line was 1.33 ± 1 compared with that for the DIV cell line, which was 66.67 ± 2.
CONCLUSIONS: The authors developed a biological dosimeter to model the response of cells from glioblastomas to single-fraction high-dose radiation. This system also allows the identification and isolation of radioresistant cells.
Ryan Smith; Kris A Smith; Christopher A Biggs; Adrienne C Scheck
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of neurosurgery     Volume:  113 Suppl     ISSN:  1933-0693     ISO Abbreviation:  J. Neurosurg.     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-12-02     Completed Date:  2011-01-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0253357     Medline TA:  J Neurosurg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  222-7     Citation Subset:  AIM; IM    
Neuro-Oncology and Neurosurgery Research, Barrow Neurological Institute, Phoenix, Arizona 85013, USA.
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MeSH Terms
Cell Line, Tumor
Dose-Response Relationship, Radiation
Glioblastoma / surgery*
Magnetic Resonance Imaging
Radiation Tolerance
Radiosurgery / instrumentation*
Radiotherapy Dosage

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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