Angiogenic and vasoprotective effects of adrenomedullin on prevention of cognitive decline after chronic cerebral hypoperfusion in mice

Takakuni Maki, Masafumi Ihara, Youshi Fujita, Takuo Nambu, Kazutoshi Miyashita, Mahito Yamada, Kazuo Washida, Keiko Nishio, Hidefumi Ito, Hiroshi Harada, Hideki Yokoi, Hiroshi Arai, Hiroshi Itoh, Kazuwa Nakao, Ryosuke Takahashi, Hidekazu Tomimoto

研究成果: Article査読

60 被引用数 (Scopus)

抄録

Background and Purpose- Although subcortical vascular dementia, the major subtype of vascular dementia, is caused by a disruption in white matter integrity after cerebrovascular insufficiency, no therapy has been discovered that will restore cerebral perfusion or functional cerebral vessels. Because adrenomedullin (AM) has been shown to be angiogenic and vasoprotective, the purpose of the study was to investigate whether AM may be used as a putative treatment for subcortical vascular dementia. Methods- A model of subcortical vascular dementia was reproduced in mice by placing microcoils bilaterally on the common carotid arteries. Using mice overexpressing circulating AM, we assessed the effect of AM on cerebral perfusion, cerebral angioarchitecture, oxidative stress, white matter change, cognitive function, and brain levels of cAMP, vascular endothelial growth factor, and basic fibroblast growth factor. Results- After bilateral common carotid artery stenosis, mice overexpressing circulating AM showed significantly faster cerebral perfusion recovery due to substantial growth of the capillaries, the circle of Willis, and the leptomeningeal anastomoses and reduced oxidative damage in vascular endothelial cells compared with wild-type mice. Vascular changes were preceded by upregulation of cAMP, vascular endothelial growth factor, and basic fibroblast growth factor. White matter damage and working memory deficits induced by bilateral common carotid artery stenosis were subsequently restored in mice overexpressing circulating AM. Conclusions- These data indicate that AM promotes arteriogenesis and angiogenesis, inhibits oxidative stress, preserves white matter integrity, and prevents cognitive decline after chronic cerebral hypoperfusion. Thus, AM may serve as a strategy to tackle subcortical vascular dementia.

本文言語English
ページ(範囲)1122-1128
ページ数7
ジャーナルStroke
42
4
DOI
出版ステータスPublished - 2011 4月

ASJC Scopus subject areas

  • 臨床神経学
  • 循環器および心血管医学
  • 高度および特殊看護

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