Different mechanisms underlie the metabolic response of GBM stem-like cells to ionizing radiation: Biological and MRS studies on effects of photons and carbon ions

Alessandra Palma, Sveva Grande, Lucia Ricci-Vitiani, Anna Maria Luciani, Mariachiara Buccarelli, Mauro Biffoni, Valentina Dini, Giuseppe A.P. Cirrone, Mario Ciocca, Laura Guidoni, Roberto Pallini, Vincenza Viti, Antonella Rosi

Research output: Contribution to journalArticlepeer-review

Abstract

Glioblastoma multiforme (GBM) is a malignant primary brain tumor with very poor prognosis, high recurrence rate, and failure of chemo-radiotherapy, mainly due to a small fraction of cells with stem-like properties (GSCs). To study the mechanisms of GSCs resistance to radiation, two GSC lines, named line #1 and line #83, with different metabolic patterns and clinical outcome, were irradiated with photon beams and carbon ions and assessed by1H Magnetic Resonance Spectroscopy (MRS). Both irradiation modalities induced early cytotoxic effects in line #1 with small effects on cell cycle, whereas a proliferative G2/M cytostatic block was observed in line #83. MR spectroscopy signals from mobile lipids (ML) increased in spectra of line #1 after photon and C-ion irradiation with effects on lipid unsaturation level, whereas no effects were detected in line #83 spectra. Gamma-Aminobutyric Acid (GABA), glutamic acid (glu) and Phosphocreatine (pCr) signals showed a significant variation only for line #1 after carbon ion irradiation. Glucose (glc) level and lactate (Lac) extrusion behaved differently in the two lines. Our findings suggest that the differences in irradiation response of GSCs #1 and #83 lines are likely attributable to their different metabolic fingerprint rather than to the different radiation types.

Original languageEnglish
Article number5167
Pages (from-to)1-18
Number of pages18
JournalInternational Journal of Molecular Sciences
Volume21
Issue number14
DOIs
Publication statusPublished - 2020

Keywords

  • Carbon ions
  • Glioblastoma
  • Metabolism
  • MRS
  • Photon beams
  • Stem cells

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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