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Regeneration of three layers vascular wall by using BMP2-treated MSC involving HIF-1α and Id1 expressions through JAK/STAT pathways.

Stem Cell Rev Rep. 2011 Nov;7(4):847-59. doi:10.1007/s12015-011-9254-6
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摘要


Engineering living, multilayered blood vessels to form in vivo arteries is a promising alternative to peripheral artery bypass using acellular grafts restricted by thrombosis and occlusion at long term. Bone Morphogenetic Protein 2 (BMP2) is a growth factor determining in the early vascular embryonic development. The aim of the present study was evaluate the collaborative effect of recombinant human--BMP2 and Bone marrow--Mesenchymal stem cells (BM-MSCs) seeded on vascular patch to regenerate a vascular arterial wall in a rat model. BM-MSCs expressing green fluorescent protein (GFP) seeded on vascular patch were cultured in presence of recombinant human-BMP2 [100 ng/mL] during 1 week before their implantation on the abdominal aorta of Wistar rats. We observed after 2 weeks under physiological arterial flow a regeneration of a three layers adult-like arterial wall with a middle layer expressing smooth muscle proteins and a border layer expressing endothelial marker. In vitro study, using Matrigel assay and co-culture of BM-MSCs with endothelial cells demonstrated that rh-BMP2 promoted tube-like formation even at long term (90 days) allowing the organization of thick rails. We demonstrated using inhibitors and siRNAs that rh-BMP2 enhanced the expression of HIF-1α and Id1 through, at least in part, the stimulation of signaling pathways. Rh-BMP2 by mimicking embryological conditions allowed vascular BM-MSCs differentiation.

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