Chronic Intermittent Hypobaric Hypoxia Pretreatment Ameliorates Ischemia-Induced Cognitive Dysfunction Through Activation of ERK1/2-CREB-BDNF Pathway in Anesthetized Mice.
Chronic intermittent hypobaric hypoxia (CIHH) has protective effects on heart and brain against ischemia injury through mobilizing endogenous adaptive mechanisms. However, whether CIHH prevents against cognitive impairment was not elucidated. The present study aimed to investigate the effect and mechanism of CIHH treatment on ischemia/reperfusion (IR)-induced cognitive dysfunction. Mice were randomly divided into 8 groups: Control, Sham, CIHH (simulating 5000 m high-altitude for 28 days, 6 h per day), IR (three 16-min occlusions of bilateral common carotid arteries interrupted by two 10-min intervals), CIHH + IR, PD98059 (inhibitor of MEK1/2) + CIHH + IR, PD98059 + Sham and PD98059 + IR group. Morris water maze and step-down passive avoidance tests were performed to evaluate the capability of learning and memory 1 month after ischemia. Thionine dyeing was to examine histological manifestations of pyramidal neurons in hippocampus CA1 region. Western blotting assay was for measurement of the protein expressions in ERK1/2-CREB-BDNF signaling pathway. There were a shorter escape latency and a longer percentage of time retaining in the target quadrant in Morris water maze test, fewer times of errors in the step-down avoidance test and a higher neuronal density of the hippocampal CA1 subfield in CIHH + IR group than in IR group. CIHH upregulated the expressions of BDNF, phosphorylated CREB, ERK1/2 and TrkB with or without ischemia. The protective effects of CIHH were abolished by PD98059 administration 15 min before ischemia. CIHH ameliorated ischemia-induced cognitive dysfunction through activation of ERK1/2-CREB-BDNF signaling pathway.
Department of Physiology, Hebei Medical University, 361 Zhongshan East Road, Shijiazhuang, 050017, China.
Jintian
J
Wang
Department of Physiology, Hebei Medical University, 361 Zhongshan East Road, Shijiazhuang, 050017, China.
Shixiao
S
Zhang
Department of Physiology, Hebei Medical University, 361 Zhongshan East Road, Shijiazhuang, 050017, China.
Huijuan
H
Ma
Department of Urology, Third Hospital of Hebei Medical University, Shijiazhuang, 050051, China.
Shijie
S
Yang
Department of Physiology, Hebei Medical University, 361 Zhongshan East Road, Shijiazhuang, 050017, China.
Zhao
Z
Liu
Department of Physiology, Hebei Medical University, 361 Zhongshan East Road, Shijiazhuang, 050017, China.
Xiaolei
X
Wu
Department of Physiology, Hebei Medical University, 361 Zhongshan East Road, Shijiazhuang, 050017, China.|Hebei Collaborative Innovation Center for Cardio-Cerebrovascular Disease, Shijiazhuang, 050000, China.
Sheng
S
Wang
Department of Physiology, Hebei Medical University, 361 Zhongshan East Road, Shijiazhuang, 050017, China.|Hebei Collaborative Innovation Center for Cardio-Cerebrovascular Disease, Shijiazhuang, 050000, China.
Yi
Y
Zhang
Department of Physiology, Hebei Medical University, 361 Zhongshan East Road, Shijiazhuang, 050017, China. phylyx2004@126.com.|Hebei Collaborative Innovation Center for Cardio-Cerebrovascular Disease, Shijiazhuang, 050000, China. phylyx2004@126.com.
Yixian
Y
Liu
D000818:Animals; D002545:Brain Ischemia / Q000378:metabolism* / Q000517:prevention & control; D019208:Brain-Derived Neurotrophic Factor / Q000378:metabolism*; D060825:Cognitive Dysfunction / Q000378:metabolism* / Q000517:prevention & control; D017362:Cyclic AMP Response Element-Binding Protein / Q000378:metabolism*; D000860:Hypoxia / Q000378:metabolism*; D020935:MAP Kinase Signaling System / Q000502:physiology*; D008297:Male; D018782:Maze Learning / Q000502:physiology; D051379:Mice; D008813:Mice, Inbred ICR; D011897:Random Allocation; D016896:Treatment Outcome
D019208:Brain-Derived Neurotrophic Factor; C492004:Creb1 protein, mouse; D017362:Cyclic AMP Response Element-Binding Protein
Brain-derived neurotrophic factor; Chronic intermittent hypobaric hypoxia; Cognitive dysfunction; Extracellular signal-regulated kinases; Ischemia/reperfusion; Mouse