Key role of estrogens and endothelial estrogen receptor alpha in blood flow-mediated remodeling of resistance arteries - Centre de recherche en cancérologie Nantes-Angers Unité Mixte de Recherche 892 Inserm - 6299 CNRS Accéder directement au contenu
Article Dans Une Revue Arterioscler Thromb Vasc Biol Année : 2013

Key role of estrogens and endothelial estrogen receptor alpha in blood flow-mediated remodeling of resistance arteries

K. Tarhouni
  • Fonction : Auteur
M. Freidja
  • Fonction : Auteur
B. Henrion
  • Fonction : Auteur
Linda Grimaud
  • Fonction : Auteur
  • PersonId : 993292
Audrey Ayer
  • Fonction : Auteur

Résumé

OBJECTIVE: Flow- (shear stress-)mediated outward remodeling of resistance arteries is involved in collateral growth during postischemic revascularization. As this remodeling is especially important during pregnancy, we hypothesized that estrogens may be involved. A surgical model eliciting a local increase in blood flow in 1 mesenteric resistance artery was used in 3-month-old ovariectomized female rats either treated with 17-beta-estradiol (E2) or left untreated. METHODS AND RESULTS: After 14 days, arterial diameter was greater in high-flow arteries than in normal-flow vessels. An ovariectomy suppressed high-flow remodeling, while E2 restored it. High-flow remodeling was absent in mice lacking the estrogen receptor alpha but not estrogen receptor beta. The kinetics of inflammatory marker expression, macrophage infiltration, oxidative stress, and metaloproteinases expression were not altered by the absence of E2 after 2 and 4 days, that is, during remodeling. Nevertheless, E2 was required for the increase in endothelial nitric oxide synthase expression and activation at day 4 when diameter expansion occurs. Finally, the impact of E2 on the endothelium appeared crucial for high-flow remodeling, as this E2 action was abrogated in mice lacking endothelial NOS, as well as in Tie2-Cre(+) ERalpha(f/f) mice. CONCLUSIONS: We demonstrate the essential role of E2 and endothelial estrogen receptor alpha in flow-mediated remodeling of resistance arteries in vivo.

Dates et versions

hal-03404023 , version 1 (26-10-2021)

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Citer

K. Tarhouni, Anne-Laure Guihot, M. Freidja, Bertrand Toutain, B. Henrion, et al.. Key role of estrogens and endothelial estrogen receptor alpha in blood flow-mediated remodeling of resistance arteries. Arterioscler Thromb Vasc Biol, 2013, 33 (3), pp.605 - 11. ⟨10.1161/ATVBAHA.112.300334⟩. ⟨hal-03404023⟩
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