苗药九仙罗汉接骨汤含药血清对MC3T3-E1Subclone14细胞增殖、凋亡和Runx2、Osterix、Bax、Bcl-2表达的影响

目的:观察苗药九仙罗汉接骨汤含药血清对MC3T3-E1Subclone14细胞增殖、凋亡及Runx2、Osterix、Bax、Bcl-2 mRNA及蛋白表达的影响,探讨其促进成骨细胞增殖,抑制成骨细胞凋亡的可能机制。方法:将体外培养的MC3T3-E1Subclone14细胞系分为空白对照组、仙灵骨葆胶囊组及九仙罗汉接骨汤含药血清低、中、高浓度组,各组制备含药血清后均用高糖DMEM培养液分别配制成不同浓度进行培养;培养24 h后采用MTT与流式细胞仪检测细胞增殖及凋亡;RT-PCR与Western Blot、免疫组化法测定Runx2、Osterix、Bax、Bcl-2 mRNA及蛋白表达。结果:与空白对照组比较,九仙罗汉接骨汤含药血清中、高浓度组增殖能力显著升高,细胞凋亡率显著降低,Runx2、Osterix、Bcl-2 mRNA及蛋白表达显著升高,Bax mRNA及蛋白表达显著降低(P<0.05或P<0.01)。结论:苗药九仙罗汉接骨汤可促进MC3T3-E1Subclone14细胞增殖,并抑制其凋亡,其作用机制可能与调节Runx2、Osterix、Bax、Bcl-2基因及蛋白表达有关。

MC3T3-E1Subclone14体外诱导成骨模型的建立及Ano5基因表达的研究

目的建立MC3T3-E1 Subclone 14体外诱导成骨模型,探讨Ano5基因表达与成骨细胞形成的关系,了解其对成骨分化的影响。方法 MC3T3-E1 Subclone 14细胞贴壁培养,加入条件培养基,分别培养至0d、3d、7d、14d、21d。倒置显微镜下观察细胞形态,通过碱性磷酸酶活力测定和茜素红染色,鉴定成骨细胞。利用REAL TIME-PCR检测Ocn、Colα1、Opg/Rankl、Osterix和Runx2等成骨相关因子的基因表达水平,同时检测Ano5基因在成骨细胞形成过程中的表达趋势。结果体外诱导MC3T3-E1 Subclone 14倒置光学显微镜下观察细胞形态呈梭形。成骨细胞碱性磷酸酶活力逐渐增高。成骨诱导培养至14d和21d,茜素红染色可见细胞表面出现矿化结节。成骨相关因子基因表达均逐渐增高,至21d达到高峰。Ano5基因从诱导分化的第3d开始表达,随后表达量逐渐增高,至14d达到高峰,21d表达量下降。结论在MC3T3-E1 Subclone 14体外诱导分化为成骨细胞过程中,Ano5基因表达量逐渐升高,至14d达到高峰,21d开始表达量具有下降趋势。

MC3T3-E1Subclone14体外诱导成骨细胞模型的建立

目的 建立MC3T3-E1 Subclone 14体外诱导成骨细胞模型,为进一步了解成骨细胞形成机制打下实验基础.方法 MC3T3-E1 Subclone 14细胞培养至贴壁,加入条件培养基：L-抗坏血酸（50μg/mL）、β-甘油磷酸钠（10mmol/mL）、地塞米松（10-8mol/mL）,培养至21d.倒置显微镜观察细胞形态;碱性磷酸酶（ALP）、Von Kossa染色鉴定成骨细胞和骨细胞;RT-PCR、Western-blot检测成骨细胞相关基因骨钙素、骨唾液酸蛋白、骨桥蛋白等相关生物学指标mRNA和蛋白表达水平,以鉴定成骨细胞体外形成.结果 1.体外诱导MC3T3-E1 Subclone 14至7d,倒置显微镜观察细胞成梭形;2.10d ALP染色结果显示：成骨细胞呈红色;3.14d Von Kossa染色结果显示：细胞表面有矿化结节形成;4.相关基因骨钙素,骨桥蛋白,骨唾液酸蛋白的mRNA和蛋白水平在14d均发生变化.结论 成功建立了MC3T3-E1 Subclone 14体外诱导成骨细胞形成模型.

Differentially expressed genes and signalling pathways are involved in mouse osteoblast-like MC3T3-E1 cells exposed to 17-β estradiol

Oestrogen is essential for maintaining bone mass, and it has been demonstrated to induce osteoblast proliferation and bone formation.In this study, complementary DNA（cDNA） microarrays were used to identify and study the expression of novel genes that may be involved in MC3T3-E1 cells’ response to 17-b estradiol. MC3T3-E1 cells were inoculated in minimum essential media alpha（a-MEM）cell culture supplemented with 17-b estradiol at different concentrations and for different time periods. MC3T3-E1 cells treated with1028mol？L2117-b estradiol for 5 days exhibited the highest proliferation and alkaline phosphatase（ALP） activity; thus, this group was chosen for microarray analysis. The harvested RNA was used for microarray hybridisation and subsequent real-time reverse transcription polymerase chain reaction（RT-PCR） to validate the expression levels for selected genes. The microarray results were analysed using both functional and pathway analysis. In this study, microarray analysis detected 5 403 differentially expressed genes,of which 1 996 genes were upregulated and 3 407 genes were downregulated, 1 553 different functional classifications were identified by gene ontology（GO） analysis and 53 different pathways were involved based on pathway analysis. Among the differentially expressed genes, a portion not previously reported to be associated with the osteoblast response to oestrogen was identified. These findings clearly demonstrate that the expression of genes related to osteoblast proliferation, cell differentiation, collagens and transforming growth factor beta（TGF-b）-related cytokines increases, while the expression of genes related to apoptosis and osteoclast differentiation decreases, following the exposure of MC3T3-E1 cells to a-MEM supplemented with 17-b estradiol. Microarray analysis with functional gene classification is critical for a complete understanding of complementary intracellular processes. This microarray analysis provides large-scale gene expression data that require further confirmatory studies.

Effects of salvia miltiorrhiza bung （SMB） onosteoblast－like cell lin （clonal MC3T3－E1 cells）

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In Vitro Biocompatibility of MC3T3-E1 Osteoblast-like Cells on Arg-Gly-Asp Acid Peptides Immobilized Graphite-like Carbon Coating on Carbon/Carbon Composites

Carbon/carbon （C/C） composites were deposited with graphite-like carbon （GLC） coating, and then, Arg-Gly- Asp acid （RGD） peptides were successfully immobilized onto the functionalized GLC coating. GLC coating was utilized to prevent carbon particles releasing and create a uniform surface condition for C/C composites. RGD peptides were utilized to improve biocompatibility of GLC coating. Surface chemical characterizations of functionalized GLC coating were detected by contact angle measurement, X-ray photoelectron spectroscopy and Raman spectra. Optical morphology of GLC coatings was observed by confocal laser scanning microscopy. In vitro biological performance was determined using samples seeded with MC3T3-E1 osteoblast-like cells and cultured for 1 week. Surface characterizations and morphological analysis indicated that C/C composites were covered by a dense and uniform GLC coating. Contact angle of GLC coating was reduced to 27.2° when it was functionalized by H202 oxidation at 40 ℃ for 1 h. In vitro cytological test showed that the RGD peptides immobilized GLC coating had a significant improvement in biocompatibility. It was suggested that RGD peptides provided GLC coating with a bioactive surface to improve cell adhesion and proliferation on C/C composites.

雌二醇通过雌激素受体α/糖原合酶激酶-3β/β联蛋白信号通路调节成骨细胞增殖

目的研究观察雌二醇对小鼠成骨细胞前体细胞增殖影响并研究经典wnt通路在其增殖过程中的作用。方法本研究利用小鼠胚胎成骨细胞前体细胞Mc3T3-E1为细胞模型,不同浓度雌二醇处理Mc3T3-E1细胞,四甲基偶氮唑蓝(MTT)检测细胞增殖率,蛋白印迹法和免疫荧光技术检测经典Wnt信号通路信号分子表达。结果研究表明不同浓度雌二醇处理Mc3T3-E1细胞,MTT显示随着雌二醇浓度增加,Mc3T3-E1细胞增殖率增加,其中以10-7 mol/L浓度处理后细胞获得最佳增殖率。蛋白印迹法结果显示随着雌激素浓度增加,小鼠Mc3T3-E1细胞中p-GSK-3β,β联蛋白(catenin),细胞周期蛋白(Cyclin)D1的表达增加。经雌激素受体(ER)α沉默后,相对于空白对照组小鼠Mc3T3-E1细胞p-GSK-3β,β-catenin及Cyclin D1表达下降,而ERβ沉默后,同对照组相比成骨细胞中各分子表达则无明显变化。结论雌二醇可通过ERα/GSK-3β/β-catenin信号通路调节小鼠成骨细胞增殖。

Study of Cell Behaviors on Anodized TiO_2 Nanotube Arrays with Coexisting Multi-Size Diameters

It has been revealed that the different morphologies of anodized TiO_2 nanotubes, especially nanotube diameters, triggered different cell behaviors. However, the influence of TiO_2 nanotubes with coexisting multi-size diameters on cell behaviors is seldom reported. In this work, coexisting four-diameter TiO_2 nanotube samples, namely,one single substrate with the integration of four different nanotube diameters(60, 150, 250, and 350 nm), were prepared by repeated anodization. The boundaries between two different diameter regions show well-organized structure without obvious difference in height. The adhesion behaviors of MC3T3-E1 cells on the coexisting fourdiameter TiO_2 nanotube arrays were investigated. The results exhibit a significant difference of cell density between smaller diameters(60 and 150 nm) and larger diameters(250 and 350 nm) within 24 h incubation with the coexistence of different diameters, which is totally different from that on the single-diameter TiO_2 nanotube arrays. The coexistence of four different diameters does not change greatly the cell morphologies compared with the singlediameter nanotubes. The findings in this work are expected to offer further understanding of the interaction between cells and materials.

Bio-inspired Cell Membrane Ingredient Cholesterol-conjugated Chitosan as a Potential Material for Bone Tissue Repair

We prepared a cholesterol-conjugated chitosan（CHCS） material and evaluated its potential application as a bone tissue repair material by in vitro cell experiments. Cell proliferation, differentiation and morphology on CHCS membrane surfaces with different graft degrees were assessed in mouse pre-osteoblasts MC3T3-E1 cells. The results indicate that CHCS materials could promote the proliferation of MC3T3-E1 cells at low graft degrees, but the CHCS material with high graft degree inhibits the proliferation of cells in contrast to the pure chitosan membrane. However, the alkaline phosphatase（ALP） activity of MC3T3-E1 ceils on different CHCS membrane surface increased with in- creasing graft degrees of cholesterol. The area of cells stretched onto the surface of CHCS materials was larger than on the surface of CS materials, and more microfilaments and stress fibers in cells were observed on CHCS materials than on the pure chitosan material surface. After 7 d, the expression of related osteogenic marker genes, such as rum-related transcription factor 2（Runx2）, osterix（OSX）, osteocalcin（OCN）, osteopontin（OPN）, ALP and collagen I（COL-I） were all up-regulated in CHCS materials to different degrees compared to pure chitosan material, which in- dicated that the CHCS materials facilitated MC3T3-EI cell differentiation and maturation, Characterizing CHCS materials is useful in designing and developing strategies for bone tissue engineering.

In vitro Biological Effects of Ti2448 Alloy Modified by Micro-arc Oxidation and Alkali Heatment

The purpose of this study was to test the hypothesis that the combination of micro-arc oxidation and alkali heatment （MAH） would improve the cytocompatibility of a newly designed Ti-24Nb-4Zr-8Sn alloy. In this study, commercially pure titanium （cp Ti） and Ti-24Nb-4Zr-8Sn were used. Surface modification of Ti-24Nb- 4Zr-8Sn by a two-step treatment of micro-arc oxidation （MAO） and alkali heatment was reported. Surface characterizations were performed by scanning electron microscopy （SEM）, thin film X-ray diffraction （TF-XRD） and X-ray photoelectron spectroscopy （XPS）. The MAH layer consisted of finer crystals and possessed a higher degree of crystallity and stability than the MAO layer. A biocompatibility study on treated and untreated Ti- 24Nb-4Zr-8Sn in comparison with cp Ti was carried out to investigate the effect of the different surfaces on the bone integration property in vitro. The cellular assays revealed that the MAO and MAH layer favored the initial adhesion of MC3T3-E1 cells and that the growth rate of MC3T3-E1 cells on MAH layer was significantly higher than that on the conventional MAO-treated layer after 3-day and 5-day incubation, demonstrating the greater potential of the hybrid treatment of micro-arc oxidation followed with alkali heatment as a novel surface modification method for implanting materials.

杜仲含药血清对成骨细胞的影响

目的:研究不同浓度杜仲含药血清对体外培养小鼠MC3T3-E1 Subclone 14成骨细胞增殖、分化的影响。方法:大鼠灌胃给予杜仲后制备含药血清,取MC3T3-E1 Subclone 14成骨细胞,分别加入空白血清(空白对照组)和含2%、5%、10%的杜仲含药血清(给药组)的培养基培养,用MTT法检测MC3T3-E1 Subclone 14成骨细胞增殖情况,ELISA法检测细胞中的碱性磷酸酶(ALP)、骨钙蛋白(OTC)、破骨细胞抑制因子与核因子κB受体活化因子配体(OPG/RANKL)系统活性。结果:与空白对照组同浓度比较,杜仲含药血清各浓度明显促进细胞增殖并上调ALP、OTC、OPG/RANKL的比值(P<0.05,P<0.01)。结论:杜仲能促进体外培养的MC3T3-E1Subclone 14成骨细胞增殖与分化。