Perfluorocarbon emulsion has been studied as an oxygen carrier, due to its high oxygen content. In clinical trials, it has shown stability in delivering oxygen to the target region. The purpose of the present study wa...Perfluorocarbon emulsion has been studied as an oxygen carrier, due to its high oxygen content. In clinical trials, it has shown stability in delivering oxygen to the target region. The purpose of the present study was to increase the stability of the emulsion by coating its surface with calcium phosphate. A layer-by-layer method was employed to coat the flexible emulsion surface. Considering the ionic affinity of calcium and phosphate to the lecithin emulsion surface, the first layer of coating was calcium and the second layer was comprised of phosphate ion. The coated emulsion demonstrated various oxygen release times depending on the thickness of the layers: from 0.04 sec. for a thickness of 8 nm to 0.17 sec. for a thickness 38 nm. Overall, the stability of the calcium phosphate coated emulsion was increased, while its original function as an oxygen carrier was maintained.展开更多
背景:随着口腔纳米材料不断的进步与发展,大量研究发现碳纳米材料在口腔种植领域有着广泛的应用。目的:文章就碳纳米材料主要分类、结构特征、成骨、抗菌、蛋白/药物载体作用以及在口腔种植方面的相关应用作一综述。方法:明确碳纳米材...背景:随着口腔纳米材料不断的进步与发展,大量研究发现碳纳米材料在口腔种植领域有着广泛的应用。目的:文章就碳纳米材料主要分类、结构特征、成骨、抗菌、蛋白/药物载体作用以及在口腔种植方面的相关应用作一综述。方法:明确碳纳米材料的分类后,以“石墨烯/碳纳米管/碳纳米纤维/碳纳米材料,口腔种植/成骨AND口腔/抗菌AND口腔/载药AND口腔”为中文检索词检索,以“Graphene/carbon nanotubes/Carbon Nanofibers/carbon nanomaterials,dental implant/osteogenesis AND oral/antibacterial AND oral/drug loaded AND oral”为英文检索词检索,由第一作者通过计算机在中国知网、万方、维普及PubMed等数据库检索1998年1月至2021年8月已发表的相关文献,部分经典文献延长检索时间限制。最终选取符合纳入标准的英文文献64篇、中文文献9篇。结果与结论:①碳纳米材料主要分为3类,即零维、一维和二维碳纳米材料,因其具有独特的空间结构和良好的理化性质,在种植体表面涂层、支架材料改性、载药和制备屏障膜等方面具有较大应用潜力。②此外材料的成骨和抗菌作用还有利于形成稳定的骨整合和良好的软组织封闭作用,在种植体周围炎的预防与治疗中也有一定的研究意义。③碳纳米材料种类繁多,许多研究还将碳纳米材料与其他生物分子材料功能化组合成复合材料,从而可以获得某种特性。此外,碳纳米材料本身也具备抗菌作用,石墨烯也常与其他抗菌剂(如银纳米粒子)功能化来增强抗菌性能。④综合来看,碳纳米材料中石墨烯作为典型的二维碳纳米材料,一直是口腔种植及其他领域研究的热点,其中氧化石墨烯是应用较为广泛的一类石墨烯衍生物材料。有研究发现将其应用于种植体表面改性时,对种植体周围炎的治疗及预防方面具有一定的研究意义。⑤但关于碳纳米材料诱导干细胞分化/成骨相关信号通路以及免疫调节机制的研究还不太明确,材料的细胞毒性、降解和不良反应也仍需进一步研究。⑥目前也有待研究出一种具有成本效益、可扩展性和可重复制备碳纳米材料的工艺方法和材料生物相容性的评价指标,此外也需进一步深入研究当碳纳米材料应用于植体表面涂层时,对种植体周围炎的预防与治疗意义。展开更多
Implant-associated bacterial infection remains one of the most common and serious complications.Therefore,a surface boasting long-term antibacterial ability for implants is highly desirable.Herein,mesoporous silica co...Implant-associated bacterial infection remains one of the most common and serious complications.Therefore,a surface boasting long-term antibacterial ability for implants is highly desirable.Herein,mesoporous silica coatings(MSCs)with vertical and size-tunable mesochannels are fabricated on a variety of metal substrates via a nano-interfacial oriented assembly approach.Such facile and versatile approach relies on the vertically oriented fusion of composite micelles on the nanoscale flatness surface of substrates.Such orientation assembly process endows the MSCs with vertical mesochannels,tunable mesopore size(ca.5.5-13.5 nm),and switchable substrates even with complex and diversified surfaces.Importantly,the MSCs on titanium substrates(Ti@MSCs)exhibit excellent performances for drug adsorption and sustained release.The saturation adsorption capacity can reach 0.544 μg·cm^(-2) towards minocycline hydrochloride(MC-HCl)antibiotic molecules,which is 6.5 times as the bare titanium(Ti)substrate.In addition,the drug release time can be controlled from 84 to 216 h by simply adjusting the mesopore size.As a proof of concept,the Ti@MSCs can realize a higher antibacterial rate(95.9%),compared with the bare Ti(70.3%).The results highlight the high potential of MSCs as implant coating for long-term preventing and eliminating peri-implantitis.展开更多
膜相关转运蛋白Slc45a2(solute carrier family 45 member 2)调节黑素体中的p H值,进而调节酪氨酸酶活性,在黑色素生成中发挥重要作用。小眼畸形转录因子(microphthalmia-associated transcription factor,MITF)已被证实是Slc45a2的调...膜相关转运蛋白Slc45a2(solute carrier family 45 member 2)调节黑素体中的p H值,进而调节酪氨酸酶活性,在黑色素生成中发挥重要作用。小眼畸形转录因子(microphthalmia-associated transcription factor,MITF)已被证实是Slc45a2的调节因子,然而其调控机制仍待研究。该研究旨在探讨Slc45a2在不同毛色小鼠皮肤是否存在差异表达,以及与毛色形成是否存在相关性。QRTPCR检测显示,Slc45a2在不同毛色小鼠皮肤样品中均有表达,在棕色和灰色小鼠皮肤中Slc45a2的表达量是黑色小鼠皮肤的6.29倍(P<0.01)和1.18倍(P<0.05);Western印迹结果显示,在棕色和灰色小鼠皮肤中Slc45a2蛋白表达量是黑色小鼠皮肤的1.44(P<0.01)和1.03倍;免疫组织化学结果表明,Slc45a2在不同毛色皮肤毛囊的毛基质、内外毛根鞘、毛乳头等区域均有表达。为了进一步了解Slc45a2在黑色素细胞色素沉着的重要作用,将Slc45a2转染到小鼠黑色素细胞并测定黑色素含量,同时检测色素沉着相关基因的表达水平。结果表明,转染Slc45a2与空载组相比黑色素含量明显增加。此外,MITF、TYR、TYRP1和TYRP2蛋白水平分别升高1.31倍、1.37倍、1.63倍和2.21倍,差异显著(P<0.05);TYRP2蛋白显著升高2.47倍(P<0.01)。MITF mRNA显著升高1.64(P<0.05);TYR和TYRP1 mRNA显著升高2.96倍(P<0.01)和8.85倍(P<0.01);TYRP2 mRNA表达量变化不明显。Slc45a2在不同毛色小鼠皮肤中均可有效表达,且差异显著。Slc45a2过量表达,使色素沉着相关基因的表达量及黑色素含量增加。由此表明,Slc45a2通过调控色素的生成,进而影响毛色的形成。展开更多
文摘Perfluorocarbon emulsion has been studied as an oxygen carrier, due to its high oxygen content. In clinical trials, it has shown stability in delivering oxygen to the target region. The purpose of the present study was to increase the stability of the emulsion by coating its surface with calcium phosphate. A layer-by-layer method was employed to coat the flexible emulsion surface. Considering the ionic affinity of calcium and phosphate to the lecithin emulsion surface, the first layer of coating was calcium and the second layer was comprised of phosphate ion. The coated emulsion demonstrated various oxygen release times depending on the thickness of the layers: from 0.04 sec. for a thickness of 8 nm to 0.17 sec. for a thickness 38 nm. Overall, the stability of the calcium phosphate coated emulsion was increased, while its original function as an oxygen carrier was maintained.
文摘背景:随着口腔纳米材料不断的进步与发展,大量研究发现碳纳米材料在口腔种植领域有着广泛的应用。目的:文章就碳纳米材料主要分类、结构特征、成骨、抗菌、蛋白/药物载体作用以及在口腔种植方面的相关应用作一综述。方法:明确碳纳米材料的分类后,以“石墨烯/碳纳米管/碳纳米纤维/碳纳米材料,口腔种植/成骨AND口腔/抗菌AND口腔/载药AND口腔”为中文检索词检索,以“Graphene/carbon nanotubes/Carbon Nanofibers/carbon nanomaterials,dental implant/osteogenesis AND oral/antibacterial AND oral/drug loaded AND oral”为英文检索词检索,由第一作者通过计算机在中国知网、万方、维普及PubMed等数据库检索1998年1月至2021年8月已发表的相关文献,部分经典文献延长检索时间限制。最终选取符合纳入标准的英文文献64篇、中文文献9篇。结果与结论:①碳纳米材料主要分为3类,即零维、一维和二维碳纳米材料,因其具有独特的空间结构和良好的理化性质,在种植体表面涂层、支架材料改性、载药和制备屏障膜等方面具有较大应用潜力。②此外材料的成骨和抗菌作用还有利于形成稳定的骨整合和良好的软组织封闭作用,在种植体周围炎的预防与治疗中也有一定的研究意义。③碳纳米材料种类繁多,许多研究还将碳纳米材料与其他生物分子材料功能化组合成复合材料,从而可以获得某种特性。此外,碳纳米材料本身也具备抗菌作用,石墨烯也常与其他抗菌剂(如银纳米粒子)功能化来增强抗菌性能。④综合来看,碳纳米材料中石墨烯作为典型的二维碳纳米材料,一直是口腔种植及其他领域研究的热点,其中氧化石墨烯是应用较为广泛的一类石墨烯衍生物材料。有研究发现将其应用于种植体表面改性时,对种植体周围炎的治疗及预防方面具有一定的研究意义。⑤但关于碳纳米材料诱导干细胞分化/成骨相关信号通路以及免疫调节机制的研究还不太明确,材料的细胞毒性、降解和不良反应也仍需进一步研究。⑥目前也有待研究出一种具有成本效益、可扩展性和可重复制备碳纳米材料的工艺方法和材料生物相容性的评价指标,此外也需进一步深入研究当碳纳米材料应用于植体表面涂层时,对种植体周围炎的预防与治疗意义。
基金This work is supported by the National Key R&D Program of China(Nos.2018YFE0201701 and 2018YFA0209401)the National Natural Science Foundation of China(Nos.22088101,21733003,and 21975050)Science and Technology Commission of Shanghai Municipality(Nos.18ZR1406300 and 19JC1410700).
文摘Implant-associated bacterial infection remains one of the most common and serious complications.Therefore,a surface boasting long-term antibacterial ability for implants is highly desirable.Herein,mesoporous silica coatings(MSCs)with vertical and size-tunable mesochannels are fabricated on a variety of metal substrates via a nano-interfacial oriented assembly approach.Such facile and versatile approach relies on the vertically oriented fusion of composite micelles on the nanoscale flatness surface of substrates.Such orientation assembly process endows the MSCs with vertical mesochannels,tunable mesopore size(ca.5.5-13.5 nm),and switchable substrates even with complex and diversified surfaces.Importantly,the MSCs on titanium substrates(Ti@MSCs)exhibit excellent performances for drug adsorption and sustained release.The saturation adsorption capacity can reach 0.544 μg·cm^(-2) towards minocycline hydrochloride(MC-HCl)antibiotic molecules,which is 6.5 times as the bare titanium(Ti)substrate.In addition,the drug release time can be controlled from 84 to 216 h by simply adjusting the mesopore size.As a proof of concept,the Ti@MSCs can realize a higher antibacterial rate(95.9%),compared with the bare Ti(70.3%).The results highlight the high potential of MSCs as implant coating for long-term preventing and eliminating peri-implantitis.
