Abstract
Normoxia is defined as an oxygen concentration of 20.9%, as in room air, whereas hypoxia refers to any oxygen concentration less than this. Any physiological oxygen deficiency or tissue oxygen deficiency relative to demand is called hypoxia. Neural stem cells (NSCs) are multipotent stem cells that can differentiate into multiple cell lines such as neurons, oligodendrocytes, and astrocytes. Under hypoxic conditions, the apoptosis rate of NSCs increases remarkably in vitro or in vivo. However, some hypoxia promotes the proliferation and differentiation of NSCs. The difference is related to the oxygen concentration, the duration of hypoxia, the hypoxia tolerance threshold of the NSCs, and the tissue source of the NSCs. The main mechanism of hypoxia-induced proliferation and differentiation involves an increase in cyclin and erythropoietin concentrations, and hypoxia-inducible factors play a key role. Multiple molecular pathways are activated during hypoxia, including Notch, Wnt/β-catenin, PI3K/Akt, and altered microRNA expression. In addition, we review the protective effect of exogenous NSCs transplantation on ischemic or anoxic organs, the therapeutic potential of hypoxic preconditioning on exogenous NSCs and clinical application of NSCs.
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References
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Acknowledgements
I would like to thank the research group for expertise and feedback, Ms. Wang for spiritual support, and Editage (www.editage.cn) for English language editing. Figure 1 and 2 were created with BioRender (BioRender.com).
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This work was funded by the National Natural Science Foundation of China (No. 81971152) and the Natural Science Foundation of Liaoning Province (2019-ZD-0742).
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Conceptualization, BF; Investigation, YF; Writing original draft, YF; Writing review and editing, BF; Modification and review, JL. All authors have read and agreed to the published version of the manuscript.
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Fan, Y., Li, J. & Fang, B. A Tale of Two: When Neural Stem Cells Encounter Hypoxia. Cell Mol Neurobiol 43, 1799–1816 (2023). https://doi.org/10.1007/s10571-022-01293-6
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DOI: https://doi.org/10.1007/s10571-022-01293-6