Long-term observation of neuronal degeneration and microgliosis in the gerbil dentate gyrus after transient cerebral ischemia

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• 作者：Ji Hyeon Ahn^a ; ¹ ; Bich Na Shin^b ; ¹ ; Joon Ha Park^c ; In Hye Kim^c ; Jeong Hwi Cho^c ; BaiHui Chen^b ; Tae-Kyeong Lee^c ; Hyun-Jin Tae^a ; Jae-Chul Lee^c ; Jun Hwi Cho^d ; Il Jun Kang^e ; Young-Myeong Kim^f ; Yun Lyul Lee^b ; Moo-Ho Won^c ; ^{mhwon@kangwon.ac.kr" class="auth_mail" title="E-mail the corresponding author} ; Jeong Yeol Seo^g ; ^{siris94@hanmail.net" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Ischemia-reperfusion ; Dentate gyrus ; Polymorphic cells ; Neuronal degeneration ; Microglia activation ; Gerbil
• 刊名：Journal of the Neurological Sciences
• 出版年：2016
• 出版时间：15 April 2016
• 年：2016
• 卷：363
• 期：Complete
• 页码：21-26
• 全文大小：2094 K

文摘

Ischemic insults in the central nervous system evoke activation of microglia. In this study, we investigated long-term changes of neuronal damage and microglial activation in the gerbil dentate gyrus for 60 days after transient cerebral ischemia using immunohistochemistry and western blot. Neuronal damage or death was hardly found in the dentate gyrus after transient ischemia using cresyl violet staining and NeuN immunohistochemistry; however, neuronal degeneration was detected in the polymorphic layer of the dentate gyrus using Fluoro-Jade (F-J) B staining. F-J B-positive cells were significantly increased after ischemia-reperfusion (I-R) and peaked at 3 days post-ischemia, thereafter, F-J B-positive cells were decreased in a time-dependent manner and shown until 30 days post-ischemia; no F-J B-positive cells were observed 60 days after I-R. On the other hand, Iba-1-immunoreactive microglia were hypertrophied after I-R, and numbers of Iba-1-immunoreactive microglia were significantly increased along with the neuronal degeneration and highest 7 days after I-R, thereafter, numbers of Iba-1-immunoreactive microglia were decreased with time, although microglia activation lasted up to 60 days after I-R. In addition, Iba-1 protein level in the dentate gyrus after I-R was changed like immunohistochemical change. Our results, in brief, indicate that transient ischemia-induced neuronal degeneration in the dentate gyrus is maintained for about 30 days after I-R and that microglial activation lasts up to, at least, 60 days after I-R in the gerbil dentate gyrus after transient cerebral ischemia.