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Arteriosclerosis, Thrombosis, and Vascular Biology
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on August 29, 2002

Arteriosclerosis, Thrombosis, and Vascular Biology. 2002
Published online before print August 29, 2002, doi: 10.1161/01.ATV.0000035393.11854.6A
A more recent version of this article appeared on October 1, 2002
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Submitted on July 1, 2002
Accepted on July 19, 2002

Estrogen Regulation of Endothelial and Smooth Muscle Cell Migration and Proliferation. Role of p38 and p42/44 Mitogen-Activated Protein Kinase

Pedro Geraldes ; Martin G. Sirois ; Pascal N. Bernatchez ; and Jean-François Tanguay *

From the Department of Medicine (P.G., J.-F.T.), Montreal Heart Institute, and the Department of Pharmacology (M.G.S., P.N.B.), University of Montreal, Montreal, Quebec, Canada.

* To whom correspondence should be addressed. E-mail: tanguay{at}icm.umontreal.ca.

Objective—Restenosis is a major limitation of percutaneous coronary intervention. Migration and proliferation of vascular cells remain a cornerstone in neointimal formation. The cardioprotection of estrogen is well recognized, but the intracellular mechanisms related to these beneficial effects are not completely understood.

Methods and Results—We investigated the effects of 17ß-estradiol (17ßE) on mitogen-activated protein kinase (MAPK) activity and the migration and proliferation of porcine aortic endothelial cells (PAECs) and porcine smooth muscle cells (PSMCs). Treatment with 17ßE (10-8 mol/L) abrogated p38 and p42/44 MAPK phosphorylation mediated by platelet-derived growth factor-BB as well as the migration and proliferation of PSMCs. In contrast, treatment with 17ßE (10-8 mol/L) induced the phosphorylation of p38 and p42/44 MAPK and the migration and proliferation of PAECs. Interestingly, the effects of 17ßE on PSMCs and PAECs were reversed by selective estrogen receptor antagonists (tamoxifen, 4-OH-tamoxifen, and raloxifen). These results suggest that in PSMCs, 17ßE inhibits chemotactic and mitogenic effects of platelet-derived growth factor-BB as well as p38 and p42/44 MAPK phosphorylation. In contrast, 17ßE promotes in PAECs the phosphorylation of p42/44 and p38 MAPK as well as the migration and proliferation of these cells.

Conclusions—Treatment with 17ßE has a dual beneficial effect: the improvement of vascular healing and the prevention of restenosis after angioplasty.


Key words: 17ß-estradiol • smooth muscle • endothelium • mitogen-activated protein kinase




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