Carbon-ion beams effectively induce growth inhibition and apoptosis in human neural stem cells compared with glioblastoma A172 cells

Mayu Isono, Yukari Yoshida, Akihisa Takahashi, Takahiro Oike, Atsushi Shibata, Yoshiki Kubota, Tatsuaki Kanai, Tatsuya Ohno, Takashi Nakano

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Carbon-ion radiotherapy (CIRT) holds promise in the treatment of glioblastoma, an aggressive X-ray-resistant brain tumor. However, since glioblastoma cells show a highly invasive nature, carbon-ion (C-ion) irradiation of normal tissues surrounding the tumor is inevitable. Recent studies have revealed the existence of neural stem cells in the adult brain. Therefore, the damaging effect of C-ion beams on the neural stem cells has to be carefully considered in the treatment planning of CIRT. Here, we investigated the growth and death mode of human neural stem cells (hNSCs) and glioblastoma A172 cells after X-ray or C-ion beam irradiation. The X-ray dose resulting in a 50% growth rate (D50) was 0.8 Gy in hNSCs and 3.0 Gy in A172 cells, while the D50 for C-ion beams was 0.4 Gy in hNSCs and 1.6 Gy in A172 cells; the relative biological effectiveness value of C-ion beams was 2.0 in hNSCs and 1.9 in A172 cells. Importantly, both X-rays and C-ion beams preferentially induced apoptosis, not necrosis, in hNSCs; however, radiation-induced apoptosis was less evident in A172 cells. The apoptosis-susceptible nature of the irradiated hNSCs was associated with prolonged upregulation of phosphorylated p53, whereas the apoptosis-resistant nature of A172 cells was associated with a high basal level of nuclear factor kappa B expression. Taken together, these data indicate that apoptosis is the major cell death pathway in hNSCs after irradiation. The high sensitivity of hNSCs to C-ion beams underscores the importance of careful target volume delineation in the treatment planning of CIRT for glioblastoma.

Original languageEnglish
Pages (from-to)856-861
Number of pages6
JournalJournal of radiation research
Volume56
Issue number5
DOIs
Publication statusPublished - 2015 Sept 1
Externally publishedYes

Keywords

  • apoptosis
  • carbon-ion (C-ion) beams
  • glioblastoma
  • neural stem cells
  • radiosensitivity

ASJC Scopus subject areas

  • Radiation
  • Radiology Nuclear Medicine and imaging
  • Health, Toxicology and Mutagenesis

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