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Intracellular reactions affecting 2-amino-4-([11C]methylthio)butyric acid ([11C]methionine) response to carbon ion radiotherapy in C10 glioma cells

Authors
Publisher
Elsevier Inc.
Publication Date
Volume
36
Issue
8
Identifiers
DOI: 10.1016/j.nucmedbio.2009.07.005
Keywords
  • Radiotherapy
  • Carbon-Ion
  • 11C-Methionine
  • Cellular Activity
Disciplines
  • Medicine

Abstract

Abstract Purpose The response of 2-amino-4-([ 14C]methylthio)butyric acid ([ 14C]Met) uptake and [ 125I]3-iodo-alpha-methyl- l-tyrosine ([ 125I]IMT) uptake to radiotherapy of C10 glioma cells was compared to elucidate the intracellular reactions that affect the response of 2-amino-4-([ 11C]methylthio)butyric acid ([ 11C]Met) uptake to radiotherapy. Methods After irradiation of cultured (3 Gy) or xenografted C10 glioma cells (25 Gy) using a carbon ion beam, the accumulation of [ 14C]Met and [ 125I]IMT in the tumors was investigated. The radiometabolites in xenografted tumors after radiotherapy were analyzed by size-exclusion HPLC. Results [ 14C]Met provided earlier responses to the carbon ion beam irradiation than [ 125I]IMT in both cultured and xenografted tumors. While [ 125I]IMT remained intact in xenografted tumor before and after irradiation, the radioactivity derived from [ 14C]Met was observed both in high molecular fractions and intact fractions, and the former decreased after irradiation. Conclusion The earlier response of [ 11C]Met uptake to tumor radiotherapy could be attributable to the decline in the intracellular energy-dependent reactions of tumors due to radiotherapy.

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