title: Changes of hypoxia-inducible factor-1 signaling and the effect of cilostazol in chronic cerebral ischemia.
abstract: Hypoxia-inducible factor-1 and its specific target gene heme oxygenase-1, are involved in acute cerebral ischemia. However, very few studies have examined in detail the changes in the hypoxia-inducible factor-1/heme oxygenase-1 signaling pathway in chronic cerebral ischemia. In this study, a rat model of chronic cerebral ischemia was established by permanent bilateral common carotid artery occlusion, and these rats were treated with intragastric cilostazol (30 mg/kg) for 9 weeks. Morris water maze results showed that cognitive impairment gradually worsened as the cerebral ischemia proceeded. Immunohistochemistry, semi-quantitative PCR and western blot analysis showed that hypoxia-inducible factor-1α and heme oxygenase-1 expression levels increased after chronic cerebral ischemia, with hypoxia-inducible factor-1α expression peaking at 3 weeks and heme oxygenase-1 expression peaking at 6 weeks. These results suggest that the elevated levels of hypoxia-inducible factor-1α may upregulate heme oxygenase-1 expression following chronic cerebral ischemia and that the hypoxia-inducible factor-1/heme oxygenase-1 signaling pathway is involved in the development of cognitive impairment induced by chronic cerebral ischemia. Cilostazol treatment alleviated the cognitive impairment in rats with chronic cerebral ischemia, decreased hypoxia-inducible factor-1α and heme oxygenase-1 expression levels, and reduced apoptosis in the frontal cortex. These findings demonstrate that cilostazol can protect against cognitive impairment induced by chronic cerebral ischemic injury through an anti-apoptotic mechanism.
authors.affiliation: Department of Neurology, China-Japan Friendship Hospital, Jilin University, Changchun 130012, Jilin Province, China ; Department of Neurology, Chang Chun Central Hospital, Changchun 130051, Jilin Province, China.
authors.forename: Han
authors.initials: H
authors.lastname: Chen
authors.affiliation: Department of Neurology, China-Japan Friendship Hospital, Jilin University, Changchun 130012, Jilin Province, China ; Department of Neurology, Jilin City Central Hospital, Jilin 132011, Jilin Province, China.
authors.forename: Aixuan
authors.initials: A
authors.lastname: Wei
authors.affiliation: Department of Neurology, China-Japan Friendship Hospital, Jilin University, Changchun 130012, Jilin Province, China.
authors.forename: Jinting
authors.initials: J
authors.lastname: He
authors.affiliation: Department of Neurology, Affiliated Hospital of Jiangsu University, Zhenjiang 212001, Jiangsu Province, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Yu
authors.affiliation: Department of Neurology, China-Japan Friendship Hospital, Jilin University, Changchun 130012, Jilin Province, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Mang
authors.affiliation: Department of Neurology, China-Japan Friendship Hospital, Jilin University, Changchun 130012, Jilin Province, China.
authors.forename: Zhongxin
authors.initials: Z
authors.lastname: Xu
keywords: apoptosis; chronic cerebral ischemia; cilostazol; cognitive impairment; grants-supported paper; heme oxygenase-1; hypoxia-inducible factor-1; neural regeneration; neuroregeneration