The remodeling of cardiovascular bioprostheses under influence of stem cell homing signal pathways

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• 作者：Geofrey De Visscher ; An Lebacq ; Lindsay Mesure ; Helga Blockx ; Ilse Vranken ; Ruth Plusquin ; Bart Meuris ; Marie-Christine Herregods ; Hans Van Oosterwyck ; Willem Flameng
• 关键词：Bioprosthesis ; Cell adhesion ; Fibronectin ; Heart valve & ; Vascular grafts
• 刊名：Biomaterials
• 出版年：2010
• 出版时间：January 2010
• 年：2010
• 卷：31
• 期：1
• 页码：20-28
• 全文大小：1280 K

文摘

Optimizing current heart valve replacement strategies by creating living prostheses is a necessity to alleviate complications with current bioprosthetic devices such as calcification and degeneration. Regenerative medicine, mostly in vitro tissue engineering, is the forerunner of this optimization search, yet here we show the functionality of an in vivo alternative making use of 2 homing axes for stem cells. In rats we studied the signaling pathways of stem cells on implanted bioprosthetic tissue (photooxidized bovine pericardium (POP)), by gene and protein expression analysis. We found that SDF-1α/CXCR4 and FN/VLA4 homing axes play a role. When we implanted vascular grafts impregnated with SDF-1α and/or FN as carotid artery interpositions, primitive cells were attracted from the circulation. Next, bioprosthetic heart valves, constructed from POP impregnated with SDF-1α and/or FN, were implanted in pulmonary position. As shown by CD90, CD34 and CD117 immunofluorescent staining they became completely recellularized after 5 months, had a normal function and biomechanical properties and specifically the combination of SDF-1α and FN had an optimal valve-cell phenotype.