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@#AIM: To investigate the correlations between aqueous concentrations of bone morphogenetic protein 6(BMP-6), interleukin 6(IL-6), and vascular endothelial growth factor(VEGF)and the parameters of macular edema acquired by optical coherence tomography(OCT)in patients with neovascular age-related macular degeneration(nARMD). <p>METHODS: Totally 35 eyes from 34 patients with nARMD were studied. Twenty eyes from 20 patients with no retinal pathology who underwent cataract surgery served as controls. The central subfield macular thickness(CSMT)of nARMD within 1 mm was measured with OCT. Aqueous humor samples were collected just before intravitreal ranibizumab injection in 35 eyes with nARMD and before cataract surgery in 20 control eyes. Concentration of BMP-6 were determined by ELISA. IL-6, VEGF were measured by cytometric bead array(CBA). <p>RESULTS: The level of BMP-6 in aqueous humor of patients with nARMD(35.29±4.27pg/mL)was significantly lower than that of control eyes(62.04±2.78pg/mL, <i>P</i><0.05), while VEGF level was 93.13±47.25pg/mL, significantly higher than that of the control group 69.21±13.40pg/mL(<i>P</i><0.05). The level of IL-6 was not significantly different between the two groups. BMP-6 was negatively correlated with CSMT(<i>r</i>=-0.409, <i>P</i>=0.015). <p>CONCLUSION: Aqueous humor concentrations of BMP-6 are decreased in eyes with nARMD. Aqueous humor concentrations of VEGF are elevated in eyes with nARMD. BMP-6 could be associated with the pathogenesis of nARMD.
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Objective To investigate the effects of platelet-rich fibrin (PRF) on BMP-6 expression during mandibular distraction osteogenesis. Methods Twenty-five mature rabbits were randomly divided into five groups. Mandibular osteoto?mies were performed corticectomy in bilateral mandibles of rabbits. PRF was implanted in the one side of mandibles, which was used as experimental group. Another side of madibular was used as control group. Rabbits were sacrificed and the dis?tracted calluses were harvested and processed for HE and BMP-6 immunohistochemistry staining at 1, 3, 7, 14 and 28 days after the end of distraction, respectively. The expressions of BMP-6 in the distracted calluses were analyzed by cell digital imaging software. Results The regenerated bone was found in the distraction gap after mandibular lengthening. Expres?sions of BMP-6 were co-localized in cytoplasm of osteoblasts and newly embedded osteocytes. Compared with control group, the positive cell rate and positive area percentage of BMP-6 were significantly higher on the 1st, 3th and 7th day after the distraction in experimental group (P<0.05). There were no significant differences in positive cell rate and positive area per?centage of BMP-6 at 14-day and 28-day after the distraction between experimental group and control group. Conclusion PRF can accelerate bone formation of mandibular distraction osteogenesis in rabbits. BMP-6 may play important role at the early stage of mandibular distraction.
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BACKGROUND:Implantation of bone morphogenetic protein (BMP) or vascular endothelial growth factor (VEGF) alone, without support vectors, is easy to be flushed away by the blood flow, and thus limits the osteogenesis and angiogenesis. OBJECTIVE: To observe the effects of combination of calcium phosphate cement (CPC), BMP-6/VEGF in bone defect repair. METHODS:Defect models of the bilateral medial femoral condyle were prepared in New Zealand white rabbits. Then, the medial femoral condyle was filed with CPC/BMP-6/VEGF, CPC/BMP-6, and CPC, respectively, in the left side, but nothing in the right side as control. After 8 and 16 weeks of implantation, the hard tissue slices were prepared for histological observation and scanning electron microscope observation. RESULTS AND CONCLUSION:Al three kinds of materials showed good biocompatibility, and no obvious inflammation was found. After 8 weeks of implantation, the junction of the CPC/BMP-6/VEGF and bone tissue was almost completely covered by newly formed trabecular bone. With the development of cement degradation, abundant osteoblasts could be found in the surface of newborn trabecular bone. After 16 weeks of implantation, an ongoing cement degradation and bone formation was seen. Moreover, newly formed bone tissue increased and became thicker. The cement in the interface was separated into smal pieces and closely interconnected with the surrounding tissues, and newly formed bone showed a mesh-like ingrowth into the cement. This newly formed bone was mature and could not be distinguished from the original trabecular bone. Both the degradation and osteogenesis of CPC and CPC/BMP-6 were much slower than that of CPC/BMP-6/VEGF (P < 0.05). This study demonstrates angiogenesis and osteogenesis in vivo through the additive effects of VEGF and BMP-6. CPC/BMP-6/VEGF can be an ideal bone substitute in bone repair.