Effects of oxygen concentration on the proliferation and differentiation of mouse neural stem cells in vitro

Nobutaka Horie, Kenji So, Takahiro Moriya, Naoki Kitagawa, Keisuke Tsutsumi, Izumi Nagata, Kazuyuki Shinohara

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)

Abstract

Background and purpose: Cerebral ischemia is known to elicit the activation of neural stem cells (NSCs); however its mechanism is not fully determined. Although oxygen concentration is known to mediate many ischemic actions, there has been little attention given to the role of pathological oxygen changes under cerebral ischemia on the activation of NSCs. We investigated the effects of various oxygen concentrations on mouse neural stem cells in vitro. Methods: NSCs were cultured from the ganglionic eminence of fetal ICR mice on embryonic day 15.5 using a neurosphere method. The effects of oxygen concentrations on proliferation, differentiation, and cell death of NSCs were evaluated by bromodeoxyuridine (BrdU) incorporation, immunocytochemistry, and TUNEL assay, respectively. Results: The highest proliferation and the neuronal differentiation of the NSCs were observed in 2% oxygen, which yielded significantly higher proportions of both BrdU-labeled cells and Tuj1-positive cells when compared with 20% and 4% oxygen. On the other hand, the differentiation to the astrocytes was not affected by oxygen concentrations, except in the case of anoxia (0% oxygen). The cell death of the NSCs increased in lower oxygen conditions and peaked at anoxia. Furthermore, the switching of the neuronal subtype differentiation from GABA-positive to glutamate-positive neurons was observed in lower oxygen conditions. Conclusions: These findings raise the possibility that reduced oxygen levels occurring with cerebral ischemia enhance NSC proliferation and neural differentiation, and that mild hypoxia (2% oxygen), which is known to occur in the ischemic penumbra, is suitable for abundant neuronal differentiation.

Original languageEnglish
Pages (from-to)833-845
Number of pages13
JournalCellular and molecular neurobiology
Volume28
Issue number6
DOIs
Publication statusPublished - 2008 Sep

Keywords

  • Cerebral ischemia
  • Differentiation
  • Hypoxia
  • Neural stem cell
  • Proliferation

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience
  • Cell Biology

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