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• W2014614753 abstract "A porous hydroxyapatite was used as a morphogenetic matrix to study early tissue formation preceding the morphogenesis of bone in extraskeletal sites of the baboon (Papio ursinus). Porous hydroxyapatites, obtained by hydrothermal conversion of the calcium carbonate exoskeleton of coral, were implanted extraskeletally in 16 baboons. Specimens were harvested at days 30, 60 and 90, and processed to obtain decalcified sections for histomorphometry, and undecalcified sections for enzyme histochemical demonstration of alkaline phosphatase, immunohistochemical demonstration of laminin and type I collagen, and for comparative histologic analysis. At day 30, the tissue that invaded the porous spaces showed mesenchymal condensations at the hydroxyapatite interface, and prominent vascular penetration. Collagen type I staining was localized within mesenchymal condensations. Bone had not formed in any specimen harvested at day 30. At days 30 and 60, alkaline phosphatase staining was initially localized in the invading vasculature, and subsequently found in cellular condensations prior to their transformation into bone, and in capillaries close to cellular condensations. Laminin staining was localized around invading capillaries adjacent to and within mesenchymal condensations, and in capillaries in direct contact with the hydroxyapatite. Bone had formed by day 60; cartilage, however, was never observed. By day 90, bone formation within the porous spaces was often extensive. Goldner's trichrome stain and fluorescence microscopy of tetracycline-labeled specimens demonstrated nascent mineralization within condensations during initial bone morphogenesis. Coating the hydroxyapatite with collagen type I prepared from baboon bone did not increase the amount of bone formation. In this hydroxyapatite-induced osteogenesis model in primates, vascular invasion and bone differentiation appear to be accompanied by a specific temporal sequence of alkaline phosphatase expression. The differentiation of osteogenic cells in direct apposition to the hydroxyapatite suggests that this substratum may act as a solid state matrix for adsorption and controlled release of endogenously-produced bone morphogenetic proteins. The porous hydroxyapatite, as used in this bioassay in primates, may be an appropriate delivery system for bone morphogenetic proteins for the controlled inititiation of therapeutic osteogenesis." @default.
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• W2014614753 date "1993-11-01" @default.
• W2014614753 modified "2023-09-27" @default.
• W2014614753 title "Expression of the Osteogenic Phenotype in Porous Hydroxyapatite Implanted Extraskeletally in Baboons" @default.
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• W2014614753 doi "https://doi.org/10.1016/s0934-8832(11)80115-0" @default.
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