Cited by 19Autophagy in Disease and TherapyNeurogenesis and neuroplasticity mechanismsEffects of Radiation Exposure

The role of Atg7-mediated autophagy in ionizing radiation-induced neural stem cell damage

Shi, Wenyu, Liu, Wei, Ma, Jiayan, Lu, Jiawei, Yang, Xuejiao, Wang, Jingdong, Cao, Jianping, Tian, Ye +2 more·2020·Gene

Abstract

Impairment of neurogenesis is thought to be one of the important mechanisms underlying radiation-induced cognitive decline. Self-renewal and differentiation of neural stem cells (NSCs) are important components of neurogenesis. It has been well established that autophagy plays an important role in neurodegenerative conditions, however, its role in radiation-induced cognitive decline remains unclear. Our previous studies have found that ionizing radiation (IR) induces autophagy in mouse neurons, and minocycline, an antibiotic that can cross the blood-brain barrier, protects neurons from radiation-induced apoptosis through promoting autophagy, thus may contribute to the improvement of mouse cognitive performance after whole-brain irradiation. In the present study, we investigated whether autophagy is involved in radiation-induced damage in self-renewal and differentiation of NSCs. We found that NSCs were extremely sensitive to IR. Irradiation induced autophagy in NSCs in a dose-dependent manner. Atg7 knockdown significantly decreased autophagy, thus increased the apoptosis levels in irradiated NSCs, suggesting that autophagy protected NSCs from radiation-induced apoptosis. Moreover, compared with the negative control NSCs, the neurosphere size was significantly reduced and the neuronal differentiation was notably inhibited in Atg7-deficient NSCs after irradiation, indicating that autophagy defect could exacerbate radiation-induced reduction in NSC self-renewal and differentiation potential. In conclusion, down-regulating autophagy by selective Atg7 knockdown in NSCs enhanced radiation-induced NSC damage, suggesting an important protective role of autophagy in maintaining neurogenesis. Along with the protective effect of autophagy on irradiated neurons, our results on NSCs not only shed the light on the involvement of autophagy in the development of radiation-induced cognitive decline, but also provided a potential target for preventing cognitive impairment after cranial radiation exposure.

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Crossref · 10.1016/j.gene.2020.144485

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  • ATG7, DNA2, and NBN encode DNA damage repair proteins in the DNA damage response, including homology-directed repair and non-homologous end joining for double-strand breaks.

    “ATG7 is an autophagy-related protein [136] which can modulate p53-dependent cell cycle pathways during prolonged stress [78] and plays a critical role in homology-directed repair (HDR) of DSBs [46]. Similarly, DNA2 encodes a HDR DNA repair protein for repair of DSBs [62] and NBN encodes a non-homologous end joining (NHEJ) DNA repair protein for repair of DSBs [158].”

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Authors
Shi, W., Liu, W., Ma, J., Lu, J., Yang, X., Wang, J., Cao, J., Tian, Y., Yang, H., & Zhang, L.
Affiliations
  • Second Affiliated Hospital of Soochow University (CN)
  • Soochow University (CN)
Corresponding author
  • Yang, Hongying
  • Zhang, Liyuan
Venue
Gene
Publisher
Elsevier BV
Published
2020-05
Volume
738
Pages
144485
ISSN
0378-1119 (ISSN-L)
OpenAlex
W3008301007
Cited by
19
References
44
Citations by year
2026: 1 · 2025: 2 · 2024: 1 · 2023: 3 · 2022: 5 · 2021: 4 · 2020: 3
FWCI
2.69
Type
journal article
Language
en
Open access
closed
Locations
  • Gene (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Natural Science Foundation of China
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Effects of Radiation Exposure
Keywords
ATG7, autophagy, neural stem cells, ionizing radiation, radiation-induced cognitive impairment, radiation-induced apoptosis, neurogenesis, neuronal differentiation, self-renewal, neurospheres, minocycline, cranial irradiation, neuroprotection
MeSH terms
Autophagy-Related Protein 7, Animals, Autophagy, Cell Differentiation, Cells, Cultured, Female, Mice, Inbred C57BL, Neurons, Pregnancy, Radiation, Ionizing, Apoptosis, Cell Proliferation, Mice, Neurogenesis, Neural Stem Cells

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