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Graphene supports in vitro proliferation and osteogenic differentiation of goat adult mesenchymal stem cells: potential for bone tissue engineering 下载免费PDF全文
Hoda Elkhenany Lisa Amelse Andersen Lafont Shawn Bourdo Marc Caldwell Nancy Neilsen Enkeleda Dervishi Oshin Derek Alexandru S. Biris David Anderson Madhu Dhar 《Journal of applied toxicology : JAT》2015,35(4):367-374
Current treatments for bone loss injuries involve autologous and allogenic bone grafts, metal alloys and ceramics. Although these therapies have proved useful, they suffer from inherent challenges, and hence, an adequate bone replacement therapy has not yet been found. We hypothesize that graphene may be a useful nanoscaffold for mesenchymal stem cells and will promote proliferation and differentiation into bone progenitor cells. In this study, we evaluate graphene, a biocompatible inert nanomaterial, for its effect on in vitro growth and differentiation of goat adult mesenchymal stem cells. Cell proliferation and differentiation are compared between polystyrene‐coated tissue culture plates and graphene‐coated plates. Graphitic materials are cytocompatible and support cell adhesion and proliferation. Importantly, cells seeded on to oxidized graphene films undergo osteogenic differentiation in fetal bovine serum‐containing medium without the addition of any glucocorticoid or specific growth factors. These findings support graphene's potential to act as an osteoinducer and a vehicle to deliver mesenchymal stem cells, and suggest that the combination of graphene and goat mesenchymal stem cells provides a promising construct for bone tissue engineering. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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Traditional imaging methods in atherosclerosis have focused primarily on anatomic information. Imaging approaches that visualize molecular targets rather than anatomic structures may emphasize biologic aspects of atherosclerosis. Molecular imaging of atherosclerotic lesions has become a crucial experimental tool and is now emerging in the clinical arena. In this review, we briefly highlight the rationale and fundamental principles of molecular imaging. We then discuss the promising imaging modalities, along with their potential limitations, and the molecular targets being investigated in experimental research. Finally, we summarize the most important clinical studies recently performed in humans. 相似文献
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Bisignani Antonio Overeinder Ingrid Kazawa Shuichiro Iacopino Saverio Cecchini Federico Miraglia Vincenzo Osório Thiago Guimarães Boveda Serge Bala Gezim Mugnai Giacomo Monaco Cinzia Ströker Erwin Brugada Pedro Sieira Juan Galli Alessio de Asmundis Carlo Chierchia Gian Battista 《Journal of interventional cardiac electrophysiology》2021,61(2):313-319
Journal of Interventional Cardiac Electrophysiology - The purpose of the study was to evaluate the impact of left atrial posterior wall isolation (LAPWI) in addition to pulmonary vein isolation... 相似文献
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von Richter O Lahu G Huennemeyer A Herzog R Zech K Hermann R 《Clinical pharmacokinetics》2007,46(7):613-622
OBJECTIVE: To investigate the effects of steady-state dosing of fluvoxamine, an inhibitor of cytochrome P450 (CYP) 1A2 and CYP2C19, on the pharmacokinetics of roflumilast, an oral, once-daily phosphodiesterase 4 (PDE4) inhibitor and its pharmacodynamically active metabolite roflumilast N-oxide. METHODS: In an open-label, non-randomised, one-sequence, two-period, two-treatment crossover study, 14 healthy subjects received a single oral dose of roflumilast 500 microg on study day 1. After a 6-day washout period, repeated doses of fluvoxamine 50 mg once daily were given from days 8 to 21. On day 15, roflumilast 500 microg and fluvoxamine 50 mg were taken concomitantly. Percentage ratios of test/reference (reference: roflumilast alone; test: roflumilast plus steady-state fluvoxamine) of geometric means and their 90% confidence intervals for area under the plasma concentration-time curve, maximum plasma concentration (roflumilast and roflumilast N-oxide) and plasma clearance of roflumilast were calculated. RESULTS: Upon co-administration with steady-state fluvoxamine, the exposure to roflumilast as well as roflumilast N-oxide increased by a factor of 2.6 and 1.5, respectively. Roflumilast plasma clearance decreased by a factor of 2.6, from 9.06 L/h (reference) to 3.53 L/h (test). The combined effect of fluvoxamine co-administration on roflumilast and roflumilast N-oxide exposures resulted in a moderate (i.e. 59%) increase in total PDE4 inhibitory activity. CONCLUSION: Co-administration of roflumilast and fluvoxamine affects the disposition of roflumilast and its active metabolite roflumilast N-oxide most likely via a potent dual pathway inhibition of CYP1A2 and CYP2C19 by fluvoxamine. The exposure increases observed for roflumilast N-oxide are suggested to be attributable to CYP2C19 co-inhibition by fluvoxamine and thus, are not to be expected to occur when roflumilast is co-administered with more selective CYP1A2 inhibitors. 相似文献
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Mugnai Giacomo Paparella Gaetano Overeinder Ingrid Ströker Erwin Sieira Juan Bisignani Antonio Iacopino Saverio Boveda Serge Beckers Stefan Umbrain Vincent Bala Gezim Brugada Pedro de Asmundis Carlo Chierchia Gian-Battista 《Journal of interventional cardiac electrophysiology》2021,61(1):87-93
Journal of Interventional Cardiac Electrophysiology - The second-generation cryoballoon ablation (CB-A) has been proven to be safe and effective for pulmonary vein (PV) isolation. Little is known... 相似文献
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Gezim Bala Henri Baudhuin Isabel Remory Kris Gillis Pieterjan Debie Ahmet Krasniqi Tony Lahoutte Geert Raes Nick Devoogdt Bernard Cosyns Sophie Hernot 《Molecular imaging and biology》2018,20(2):260-267
Purpose
Macrophage accumulation characterizes the development of atherosclerotic plaques, and the presence of certain macrophage subsets might be an indicator of plaque phenotype and (in)stability. The macrophage mannose receptor (MMR) is expressed on alternatively activated macrophages and found at sites of intraplaque hemorrhage and neovascularization. It has been proposed as target to identify vulnerable plaques. Therefore, we aimed to assess the feasibility of using anti-MMR nanobodies (Nbs) as molecular tracers for nuclear imaging in an animal model of atherosclerosis.Procedure
Anti-MMR and control Nb, radiolabeled with Tc-99m, were injected in ApoE?/? and/or C57Bl/6 mice (n = 6). In vivo competition studies involving pre-injection of excess of unlabeled anti-MMR Nb (n = 3) and injection of anti-MMR Nb in MMR?/? mice (n = 3) were performed to demonstrate specificity. At 3 h p.i. radioactive uptake in organs, tissues and aorta segments were evaluated. Autoradiography and immunofluorescence were performed on aortic sections.Results
Significantly higher uptake was observed in all aortic segments of ApoE?/? mice injected with anti-MMR Nb compared to control Nb (1.36 ± 0.67 vs 0.38 ± 0.13 percent of injected dose per gram (%ID/g), p ≤ 0.001). Surprisingly, high aortic uptake was also observed in C57Bl/6 mice (1.50 ± 0.43%ID/g, p ≥ 0.05 compared to ApoE?/?), while aortic uptake was reduced to background levels in the case of competition and in MMR?/? mice (0.46 ± 0.10 and 0.22 ± 0.06%ID/g, respectively; p ≤ 0.001). Therefore, expression of MMR along healthy aortas was suggested. Autoradiography showed no specific radioactive signal within atherosclerotic plaques, but rather localization of the signal along the aorta, correlating with MMR expression in perivascular tissue as demonstrated by immunofluorescence.Conclusions
No significant uptake of MMR-specific Nb could be observed in atherosclerotic lesions of ApoE?/? mice in this study. A specific perivascular signal causing a non-negligible background level was demonstrated. This observation should be considered when using MMR as a target in molecular imaging of atherosclerosis, as well as use of translational animal models with vulnerable plaques.10.
Akihiro Takano Tolga Uz Jesus Garcia-Segovia Max Tsai Gezim Lahu Nahid Amini Ryuji Nakao Zhisheng Jia Christer Halldin 《Molecular imaging and biology》2018,20(4):615-622