(Circulation. 2003;108:3115-3121.)
© 2003 American Heart Association, Inc.
Basic Science Reports |
From the Division of Cardiovascular Research, St Elizabeths Medical Center, Tufts University School of Medicine, Boston, Mass.
Correspondence to Douglas W. Losordo, MD, St Elizabeths Medical Center, 736 Cambridge St, Boston, MA 02135. E-mail douglas.losordo{at}tufts.edu
Received March 5, 2003; de novo received September 12, 2003; revision received October 30, 2003; accepted October 31, 2003.
Background We hypothesized that estrogen-induced acceleration of reendothelialization might be mediated in part by effects involving mobilization and incorporation of bone marrowderived endothelial progenitor cells (EPCs).
Methods and Results Carotid injury was induced in ovariectomized wild-type mice receiving either 17ß-estradiol or placebo. Estradiol treatment significantly accelerated reendothelialization of injured arterial segments within 7 days and resulted in a significant reduction of medial thickness 14 and 21 days after the injury. Significant increases in circulating EPCs 3 days after the injury were observed in the estradiol group compared with placebo-treated mice. These data were further supported by fluorescence-activated cell sorting analysis, which disclosed a significant increase in Sca-1/Flk-1positive cells in estradiol versus control mice. To evaluate the effects of estradiol on bone marrowderived EPC incorporation at sites of reendothelialization, carotid injury was established in ovariectomized wild-type mice transplanted with bone marrow from transgenic donors expressing ß-galactosidase transcriptionally regulated by the Tie-2 promoter. Significantly greater numbers of X-galpositive cells were observed at reendothelialized areas in the estradiol group 3 days after injury as compared with placebo. Fluorescent immunohistochemistry 14 days after the injury documented a marked increase in cells expressing both ß-gal, indicating bone marrow origin and Tie-2 expression, and isolectin B4, also indicating endothelial lineage, in the estradiol group compared with control. In contrast, estradiol did not accelerate reendothelialization or augment EPC mobilization into the peripheral circulation after injury in endothelial nitric oxide synthasedeficient mice (eNOS-/-). Furthermore, estradiol exhibited direct stimulatory effects on EPC mitogenic and migration activity and inhibited EPC apoptosis.
Conclusions Estradiol accelerates reendothelialization and attenuates medial thickening after carotid injury in part by augmenting mobilization and proliferation of bone marrowderived EPCs and their incorporation into the recovering endothelium at the site of injury.
Key Words: estrogen endothelium arteries nitric oxide synthase
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