Estrogen protects against intracranial aneurysm rupture in ovariectomized mice

Research output: Contribution to journalArticle

Authors

  • Yoshiteru Tada
  • Kosuke Wada
  • Kenji Shimada
  • Hiroshi Makino
  • Elena I. Liang
  • Shoko Murakami
  • Mari Kudo
  • Fumiaki Shikata
  • Ricardo A.Pena Silva
  • Keiko T. Kitazato
  • David M. Hasan
  • Yasuhisa Kanematsu
  • Shinji Nagahiro
  • Tomoki Hashimoto

External Institution(s)

  • University of California at San Francisco
  • Tokushima University
  • University of Iowa

Details

Original languageEnglish (US)
Pages (from-to)1339-1344
Number of pages6
JournalHypertension
Volume63
Issue number6
StatusPublished - Jun 2014
Peer-reviewedYes

Abstract

Clinical observations suggest that postmenopausal women have a higher incidence of aneurysmal rupture than premenopausal women. We hypothesize that a relative deficiency in estrogen may increase the risks of aneurysmal growth and subarachnoid hemorrhage in postmenopausal women. We assessed the effects of estrogen and selective estrogen receptor subtype agonists on the development of aneurysmal rupture in ovariectomized female mice. We used an intracranial aneurysm mouse model that recapitulates the key features of human intracranial aneurysms, including spontaneous rupture. Ten- to 12-week-old ovariectomized female mice received treatment with estrogen, nonselective estrogen receptor antagonist, estrogen receptor-α agonist, or estrogen receptor-β agonist starting 6 days after aneurysm induction so that the treatments affected the development of aneurysmal rupture without affecting aneurysmal formation. Estrogen significantly reduced the incidence of ruptured aneurysms and rupture rates in ovariectomized mice. Nonselective estrogen receptor antagonist abolished the protective effect of estrogen. Although estrogen receptor-α agonist did not affect the incidence of ruptured aneurysms or rupture rates, estrogen receptor-β agonist prevented aneurysmal rupture without affecting the formation of aneurysms. The protective role of estrogen receptor-β agonist was abolished by the inhibition of nitric oxide synthase. We showed that estrogen prevented aneurysmal rupture in ovariectomized female mice. The protective effect of estrogen seemed to occur through the activation of estrogen receptor-β, a predominant subtype of estrogen receptor in human intracranial aneurysms and cerebral arteries.

    Research areas

  • Estrogens, Menopause, Models, animal

Citation formats

APA

Tada, Y., Wada, K., Shimada, K., Makino, H., Liang, E. I., Murakami, S., ... Hashimoto, T. (2014). Estrogen protects against intracranial aneurysm rupture in ovariectomized mice. Hypertension, 63(6), 1339-1344. https://doi.org/10.1161/HYPERTENSIONAHA.114.03300

Harvard

Tada, Y, Wada, K, Shimada, K, Makino, H, Liang, EI, Murakami, S, Kudo, M, Shikata, F, Silva, RAP, Kitazato, KT, Hasan, DM, Kanematsu, Y, Nagahiro, S & Hashimoto, T 2014, 'Estrogen protects against intracranial aneurysm rupture in ovariectomized mice', Hypertension, vol. 63, no. 6, pp. 1339-1344. https://doi.org/10.1161/HYPERTENSIONAHA.114.03300