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Valosin-containing protein is a key mediator between autophagic cell death and apoptosis in adult hippocampal neural stem cells following insulin withdrawal

Valosin-containing protein is a key mediator between autophagic cell death and apoptosis in adult hippocampal neural stem cells following insulin withdrawal
Yeo, Bo KyoungHong, Caroline JeeyeonChung, Kyung MinWoo, HanwoongKim, KyungchanJung, SeongheeKim, Eun-KyoungYu, Seong-Woon
DGIST Authors
Chung, Kyung MinKim, Eun-KyoungYu, Seong-Woon
Issued Date
Article Type
AdultAdult Neural Stem CellsAnimal CellAnimal TissueApoptosisAutophagic Cell DeathAutophagosomeAutophagyBrain Nerve CellControlled StudyDown-RegulationDrug WithdrawalEmbryoGene InactivationHippocampusInsulinInsulin WithdrawalMembrane TransportNeural Stem CellNon-HumanPriority JournalProtein DegradationProtein ExpressionProtein TransportRatRegulatory MechanismSignal TransductionValosin-Containing Protein
Background: Programmed cell death (PCD) plays essential roles in the regulation of survival and function of neural stem cells (NSCs). Abnormal regulation of this process is associated with developmental and degenerative neuronal disorders. However, the mechanisms underlying the PCD of NSCs remain largely unknown. Understanding the mechanisms of PCD in NSCs is crucial for exploring therapeutic strategies for the treatment of neurodegenerative diseases. Result: We have previously reported that adult rat hippocampal neural stem (HCN) cells undergo autophagic cell death (ACD) following insulin withdrawal without apoptotic signs despite their normal apoptotic capabilities. It is unknown how interconnection between ACD and apoptosis is mediated in HCN cells. Valosin-containing protein (VCP) is known to be essential for autophagosome maturation in mammalian cells. VCP is abundantly expressed in HCN cells compared to hippocampal tissue and neurons. Pharmacological and genetic inhibition of VCP at basal state in the presence of insulin modestly impaired autophagic flux, consistent with its known role in autophagosome maturation. Of note, VCP inaction in insulin-deprived HCN cells significantly decreased ACD and down-regulated autophagy initiation signals with robust induction of apoptosis. Overall autophagy level was also substantially reduced, suggesting the novel roles of VCP at initial step of autophagy. Conclusion: Taken together, these data demonstrate that VCP may play an essential role in the initiation of autophagy and mediation of crosstalk between ACD and apoptosis in HCN cells when autophagy level is high upon insulin withdrawal. This is the first report on the role of VCP in regulation of NSC cell death. Elucidating the mechanism by which VCP regulates the crosstalk of ACD and apoptosis will contribute to understanding the molecular mechanism of PCD in NSCs. © 2016 Yeo et al.
BioMed Central Ltd.
Related Researcher
  • 김은경 Kim, Eun-Kyoung 뇌과학과
  • Research Interests Neural functions in metabolic diseases; 뇌신경세포와 비만; 당뇨 등의 대사 질환 관련 연구
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Appears in Collections:
ETC 1. Journal Articles
Department of Brain Sciences Lab of Neuro-Metabolism & Neurometabolomic Research Center 1. Journal Articles
Department of Brain Sciences Laboratory of Neuronal Cell Death 1. Journal Articles


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