title: Local delivery of 17beta-estradiol improves reendothelialization and decreases inflammation after coronary stenting in a porcine model.
abstract: In the current study, we investigated the effect of local intravascular delivery of 17beta-estradiol (17beta-E) on subsequent in-stent neointimal hyperplasia. Twenty-seven stents were implanted in coronary arteries of juvenile swine. Coronary arteries were randomized to local treatment with 17beta-E or no drug therapy (control-vehicle treated). Twenty-eight days post-treatment, angiographic images revealed an improved minimal lumen diameter (2.2 +/- 0.2 vs. 1.3 +/- 0.2 mm, P < 0.005) and a reduction of late lumen loss (1.7 +/- 0.2 vs. 2.3 +/- 0.1 mm, P < 0.01) in 17beta-E-treated vessels compared to control-vehicle treated. Histological analyses showed a reduction of stenosis (51.49 +/- 6.75 vs. 70.86 +/- 6.24%, P < 0.05), mean neointimal thickness (0.51 +/- 0.07 vs. 0.83 +/- 0.14 mm, P < 0.05) and inflammation score (1.29 +/- 0.28 vs. 2.85 +/- 0.40, P < 0.05) in 17beta-E-treated arteries compared to control-vehicle treated arteries. Immunohistochemistry analyses revealed a reduction of proliferating smooth muscle cells and increased in-stent reendothelialization in 17beta-E-treated arteries. Finally, we observed a correlation between neointimal hyperplasia and inflammation score, which in turn, was inversely related to reendothelialization. Locally delivered, 17beta-E is inhibiting the inflammatory response and smooth muscle cells proliferation and improving vascular reendothelialization which together are contributing to reduce in-stent restenosis in a porcine coronary injury model. Together, these data demonstrate the potential clinical application of 17beta-estradiol to improve vascular healing and prevent in-stent restenosis.
authors.affiliation: Research Center, Montreal Heart Institute, Montreal, Quebec, Canada.
authors.forename: Baskaran
authors.initials: B
authors.lastname: Chandrasekar
authors.forename: Martin G
authors.initials: MG
authors.lastname: Sirois
authors.forename: Pascale
authors.initials: P
authors.lastname: Geoffroy
authors.forename: Dominique
authors.initials: D
authors.lastname: Lauzier
authors.forename: Stanley
authors.initials: S
authors.lastname: Nattel
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Tanguay
mesh_terms: D015906:Angioplasty, Balloon, Coronary; D000818:Animals; D017023:Coronary Angiography; D003326:Coronary Circulation; D023903:Coronary Restenosis / Q000276:immunology / Q000473:pathology / Q000517:prevention & control*; D004195:Disease Models, Animal; D004730:Endothelium, Vascular / Q000187:drug effects* / Q000276:immunology / Q000473:pathology; D004958:Estradiol / Q000494:pharmacology*; D005260:Female; D008297:Male; D015607:Stents; D034421:Sus scrofa; D014657:Vasculitis / Q000188:drug therapy* / Q000276:immunology / Q000473:pathology; D014945:Wound Healing / Q000187:drug effects
chemical_list: D004958:Estradiol