Abstract
Ischemic preconditioning (IPC) provides neuroprotection against subsequent severe ischemic insults by specific mechanisms. We tested the hypothesis that IPC attenuates post-ischemic neuronal death in the gerbil hippocampal CA1 region (CA1) throughout hypoxia inducible factor-1α (HIF-1α) and its associated factors such as vascular endothelial growth factor (VEGF) and nuclear factor-kappa B (NF-κB). Lethal ischemia (LI) without IPC increased expressions of HIF-1α, VEGF, and p-IκB-α (/and translocation of NF-κB p65 into nucleus) in CA1 pyramidal neurons at 12 h and/or 1-day post-LI; thereafter, their expressions were decreased in the CA1 pyramidal neurons with time and newly expressed in non-pyramidal cells (pericytes), and the CA1 pyramidal neurons were dead at 5-day post-LI, and, at this point in time, their immunoreactivities were newly expressed in pericytes. In animals with IPC subjected to LI (IPC/LI)-group), CA1 pyramidal neurons were well protected, and expressions of HIF-1α, VEGF, and p-IκB-α (/and translocation of NF-κB p65 into nucleus) were significantly increased compared to the sham-group and maintained after LI. Whereas, treatment with 2ME2 (a HIF-1α inhibitor) into the IPC/LI-group did not preserve the IPC-mediated increases of HIF-1α, VEGF, and p-IκB-α (/and translocation of NF-κB p65 into nucleus) expressions and did not show IPC-mediated neuroprotection. In brief, IPC protected CA1 pyramidal neurons from LI by upregulation of HIF-1α, VEGF, and p-IκB-α expressions. This study suggests that IPC increases HIF-1α expression in CA1 pyramidal neurons, which enhances VEGF expression and NF-κB activation and that IPC may be a strategy for a therapeutic intervention of cerebral ischemic injury.
Original language | English |
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Pages (from-to) | 6984-6998 |
Number of pages | 15 |
Journal | Molecular Neurobiology |
Volume | 54 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2017 Nov 1 |
Bibliographical note
Funding Information:Acknowledgments The authors would like to thank Mr. Seung Uk Lee for his technical help in this study. This work was supported by the Bio & Medical Technology Development Program of the NRF funded by the Korean government, MSIP (NRF-2015M3A9B6066835), by the National Research Foundation of Korea (NRF-2013M3A9B6046563), which was funded by the Ministry of Science, ICT, and Future Planning, and by Bio-Synergy Research Project (NRF-2015M3A9C4076322) of the Ministry of Science, ICT and Future Planning through the National Research Foundation.
Funding Information:
The authors would like to thank Mr. Seung Uk Lee for his technical help in this study. This work was supported by the Bio & Medical Technology Development Program of the NRF funded by the Korean government, MSIP (NRF-2015M3A9B6066835), by the National Research Foundation of Korea (NRF-2013M3A9B6046563), which was funded by the Ministry of Science, ICT, and Future Planning, and by Bio-Synergy Research Project (NRF-2015M3A9C4076322) of the Ministry of Science, ICT and Future Planning through the National Research Foundation. Jae-Chul Lee and Hyun-Jin Tae contributed equally to this article. The authors declare that they have no competing interests.
Publisher Copyright:
© 2016, Springer Science+Business Media New York.
All Science Journal Classification (ASJC) codes
- Neurology
- Cellular and Molecular Neuroscience