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- W2014586516 abstract "La calcification de tissus non osseux, tels que valves cardiaques ou vaisseaux, est un problème fréquemment rencontré en pratique clinique. Le mécanisme qui préside à la calcification de ces tissus n'a pu encore être élucidé. Des études antérieures ont montré que les dépôts de cristaux d'hydroxyapatite étaient associés à une augmentation du contenu en protéines intratissulaires. Plus récemment, l'ostéopontine a été retrouvée dans certains tissus vivants calcifiés tels que valves cardiaques ou artères athéromateuses. Le but de cette étude était de déterminer si ces mêmes protéines pouvaient être également retrouvées dans des tissus acellulaires, notamment des valves cardiaques hétérologues fixées par le glutaraldéhyde puis implantées chez l'homme. L'étude porte sur 38 bioprothèses valvulaires, 16 bioprothèses servant de contrôle et 22 bioprothèses explantées après 11 ans d'implantation chez l'homme. Parmi ces 22 valves implantées, 16 étaient calcifiées et 6 ne l'étaient pas. Dans les zones valvulaires calcifiées des valves implantées, l'analyse histo-immunochimique et par Western blot a montré la présence d'ostéopontine tandis qu'ostéocalcine, bone sialoprotéine et ostéonectine n'étaient pas détectables. À l'inverse, dans les zones non calcifiées des valves implantées et dans les valves non implantées, l'ostéopontine n'était pas retrouvée. Ainsi, la présence d'ostéopontine est associée au processus de calcification de tissus valvulaires hétérologues, traités par le glutaraldéhyde, après implantation chez l'homme. Dès lors que ces tissus valvulaires fixés avant implantation ne contiennent pas de cellules de réhabitation venues de l'hôte, et que les rares cellules présentes n'expriment pas l'ostéopontine, cette étude suggère qu'un mécanisme non cellulaire peut jouer un rôle dans le processus de calcification des bioprothèses valvulaires. Calcification of non-osseous tissues such as heart valves or vessels is a major concern in clinical practice. The exact mechanism is still unknown. Numerous studies have shown that mineral deposits of crystalline hydroxyapatite within these tissues were associated with increased non-collagenous protein content. More recently osteopontin was found to be associated with calcification in living tissues such as vessels and native human aortic valves. The aim of this study was to determine whether or not non-collagenous proteins can also be found in non-living tissues such as glutaraldehyde-pretreatedporcine valves after implantation in humans. Thirty-eight glutaraldéhyde pretreated porcine bioprostheses were studied: 16 not implanted and 22 after 11 years of implantation in the aortic and mitral valve position in humans. In areas of calcification vizualized by Von Kossa staining and microradiography, immunostaining using polyclonal antibodies against calcium-bindingproteins showed osteopontin positive staining and no staining for osteocalcin, bone sialoprotein or osteonectin. In uncalcified areas and in non-implanted valves, staining for osteopontin or other calcium-binding proteins was negative. Western blot analysis of macroscopically calcified and uncalcified areas showed that several proteins were adsorbed in implanted valves and confirmed the presence of osteopontin in the calcified areas, while no immunolabelling was found in non-calcified areas, in uncalcified valves and in non-implanted valves. Thus the presence of osteopontin in the calcified areas of bioprosthetic heart valves implanted in human indicates that this protein is associated with bioprosthetic valvular calcification. Since these valves are made of non-living connective tissue, and no cell immunostained for osteopontin was found around the calcified area, this study suggests that a non-cellular mediated mechanism involving protein adsorption may play a role in bioprosthetic valvular calcification." @default.
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- W2014586516 title "Osteopontin is associated with bioprosthetic heart valve calcification in humans" @default.
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- W2014586516 doi "https://doi.org/10.1016/s0764-4469(99)80086-9" @default.
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