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Lee TK, Park YE, Park CW, Kim B, Lee JC, Park JH, Lee HA, Won MH, Ahn JH. Age-dependent changes of p53 and p63 immunoreactivities in the mouse hippocampus. Lab Anim Res 2019; 35:20. [PMID: 32257908 PMCID: PMC7081572 DOI: 10.1186/s42826-019-0022-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Accepted: 10/09/2019] [Indexed: 12/31/2022] Open
Abstract
P53 and its family member p63 play important roles in cellular senescence and organismal aging. In this study, p53 and p63 immunoreactivity were examined in the hippocampus of young, adult and aged mice by using immunohistochemistry. In addition, neuronal distribution and degeneration was examined by NeuN immunohistochemistry and fluoro-Jade B fluorescence staining. Strong p53 immunoreactivity was mainly expressed in pyramidal and granule cells of the hippocampus in young mice. p53 immunoreactivity in the pyramidal and granule cells was significantly reduced in the adult mice. In the aged mice, p53 immunoreactivity in the pyramidal and granule cells was more significantly decreased. p63 immunoreactivity was strong in the pyramidal and granule cells in the young mice. p63 immunoreactivity in these cells was apparently and gradually decreased with age, showing that p63 immunoreactivity in the aged granule cells was hardly shown. However, numbers of pyramidal neurons and granule cells were not significantly decreased in the aged mice with normal aging. Taken together, this study indicates that there are no degenerative neurons in the hippocampus during normal aging, showing that p53 and p63 immunoreactivity in hippocampal neurons was progressively reduced during normal aging, which might be closely related to the normal aging processes.
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Affiliation(s)
- Tae-Kyeong Lee
- 1Department of Neurobiology, School of Medicine, Kangwon National University, Chuncheon, Gangwon 24341 Republic of Korea
| | - Young Eun Park
- 1Department of Neurobiology, School of Medicine, Kangwon National University, Chuncheon, Gangwon 24341 Republic of Korea
| | - Cheol Woo Park
- 1Department of Neurobiology, School of Medicine, Kangwon National University, Chuncheon, Gangwon 24341 Republic of Korea
| | - Bora Kim
- 1Department of Neurobiology, School of Medicine, Kangwon National University, Chuncheon, Gangwon 24341 Republic of Korea
| | - Jae-Chul Lee
- 1Department of Neurobiology, School of Medicine, Kangwon National University, Chuncheon, Gangwon 24341 Republic of Korea
| | - Joon Ha Park
- 2Department of Anatomy, College of Korean Medicine, Dongguk University, Gyeongju, Gyeongbuk 38066 Republic of Korea
| | - Hyang-Ah Lee
- 3Department of Obstetrics and Gynecology, School of Medicine, Kangwon National University, Chuncheon, Gangwon 24341 Republic of Korea
| | - Moo-Ho Won
- 1Department of Neurobiology, School of Medicine, Kangwon National University, Chuncheon, Gangwon 24341 Republic of Korea
| | - Ji Hyeon Ahn
- 4Department of Biomedical Science, Research Institute of Bioscience and Biotechnology, Hallym University, Chuncheon, Gangwon 24252 Republic of Korea
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Zhu YZ, Wang W, Xian N, Wu B. Inhibition of TYRO3/Akt signaling participates in hypoxic injury in hippocampal neurons. Neural Regen Res 2016; 11:752-7. [PMID: 27335558 PMCID: PMC4904465 DOI: 10.4103/1673-5374.182701] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
In this study, we investigated the role of the TYRO3/Akt signaling pathway in hypoxic injury to hippocampal neurons. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay showed that hypoxia inhibited the proliferation and viability of hippocampal neurons. Terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling assay demonstrated that hypoxia induced neuronal apoptosis in a time-dependent manner, with a greater number of apoptotic cells with longer hypoxic exposure. Immunofluorescence labeling revealed that hypoxia suppressed TYRO3 expression. Western blot assay showed that hypoxia decreased Akt phosphorylation levels in a time-dependent manner. Taken together, these findings suggest that hypoxia inhibits the proliferation of hippocampal neurons and promotes apoptosis, and that the inhibition of the TYRO3/Akt signaling pathway plays an important role in hypoxia-induced neuronal injury.
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Affiliation(s)
- Yan-Zhen Zhu
- School of Basic Medical Sciences, Fujian Medical University, Fuzhou, Fujian Province, China
| | - Wei Wang
- School of Basic Medical Sciences, Fujian Medical University, Fuzhou, Fujian Province, China
| | - Na Xian
- School of Basic Medical Sciences, Fujian Medical University, Fuzhou, Fujian Province, China
| | - Bing Wu
- School of Basic Medical Sciences, Fujian Medical University, Fuzhou, Fujian Province, China
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Hye Kim I, Lee JC, Ha Park J, Hyeon Ahn J, Cho JH, Hui Chen B, Na Shin B, Chun Yan B, Rueol Ryu D, Hong S, Hwi Cho J, Lyul Lee Y, Kim YM, Cho BR, Won MH. Time interval after ischaemic preconditioning affects neuroprotection and gliosis in the gerbil hippocampal CA1 region induced by transient cerebral ischaemia. Neurol Res 2016; 38:210-9. [DOI: 10.1179/1743132815y.0000000098] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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