Abstract
In the present study, we characterized the expression and role of forkhead box O (FoxO3a) in kainic acid (KA)-induced hippocampal neuronal cell death. FoxO3a and pFoxO3a expression in the CA1, CA2, and dentate gyrus regions in the hippocampus increased 0.5 and 1 h after intracerebroventricular administration of KA. In addition, both FoxO3a and pFoxO3a expression in the hippocampal CA3 region increased significantly and equally for 1 h but decreased gradually for 24 h after KA administration. In particular, the KA-induced increases in FoxO3a and pFoxO3a expression in the hippocampal CA3 region were inhibited by pretreatment with the N-methyl-d-aspartate (NMDA) receptor antagonist (MK-801, dizocilpine, 1 µg/5 µl) or a non-NMDA receptor antagonist (CNQX, 6-cyano-7-nitroquinoxaline-2,3-dione, 0.5 µg/5 µl). Furthermore, dizocilpine and CNQX produced a neuroprotective effect against KA-induced neuronal death in the CA3 region of the hippocampus. Our results suggest that FoxO3a and pFoxO3 expression is upregulated by KA. Both FoxO3a and pFoxO3a expression appear to be responsible for KA-induced neuronal death in the CA3 region of the hippocampus.
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Acknowledgments
This research was supported by Priority Research Centers (NRF-2009-0094071 and NRF-2014R1A1A1006791) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology and Hallym University Specialization Fund (HRF-S-52).
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Park, SH., Sim, YB., Lee, JK. et al. Characterization of temporal expressions of FOXO and pFOXO proteins in the hippocampus by kainic acid in mice: involvement of NMDA and non-NMDA receptors. Arch. Pharm. Res. 39, 660–667 (2016). https://doi.org/10.1007/s12272-016-0733-9
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DOI: https://doi.org/10.1007/s12272-016-0733-9