左归丸含药血清通过p38 MAPK信号通路诱导MC3T3-E1成骨细胞的分化

目的 探讨p38MAPK信号通路对左归丸含药血清干预MC3I3-E1成骨细胞分化的影响.方法 制备大鼠含药血清,选用p38特异阻滞剂SB203580,实验分为空白对照组、SB203580组、左归丸组、左归丸加SB203580组、倍美力组、倍美力加SB203580组.孵育48 h后,采用PNPP法检测碱性磷酸酶(ALP)活性,采用Westem印迹法分析ALP蛋白表达水平;孵育7d,采用改良钙钴染色法检测ALP活性;孵育14d,采用茜素红染色法测定矿化沉积情况.结果 与空白对照组比较,左归丸组显著促进MC3T3-E1成骨细胞分化,明显上调ALP蛋白表达水平(P＜0.01);与左归丸组比较,左归丸加SB203580组显著抑制左归丸含药血清对MC3T3-E1成骨细胞的分化的促进作用,明显下调ALP蛋白表达水平(P＜0.01).结论 左归丸含药血清可能部分通过p38MAPK信号通路干预MC3T3-E1成骨细胞分化.     

高糖对成骨细胞MC3T3-E1活性影响的研究

目的探讨高糖对体外培养小鼠前体成骨细胞MC3T3-E1活性的影响。方法将培养的MC3T3-E1细胞分为5．5mmol／L正常糖对照组、12．5mmol／L高糖组和25mmol／L高糖组,观察不同浓度糖对MC3T3-E1细胞增殖、碱性磷酸酶（ALP）、矿化结节、骨钙素（OC）及Caspase-3的影响。结果与5．5mmol／L正常糖对照组相比,12．5mmol／L高糖组培养5d细胞增殖和ALP分泌不受影响,在培养7d和14d时明显促进矿化结节形成,在培养5d时促进细胞内0（2表达,在培养3d时促进Caspase-3的表达;而25mmol／L高糖组在培养5d则可明显抑制细胞增殖及ALP分泌,在培养14d减少矿化结节的形成,在培养第5d时减少0（2表达,在培养3d时促进Caspase-3的表达。结论高糖可影响MC3T3-E1细胞活性,12．5mmol／L糖在培养时间内不影响细胞增殖与分化,可促进矿化;25mmol／L糖则对细胞产生明显的抑制效应。     

氟调控成骨细胞内质网应激信号通路对细胞增殖凋亡分化的影响

目的探讨氟调控成骨细胞内质网应激信号通路对细胞增殖凋亡分化的影响。方法培养成骨细胞MC3T3-E1,0、1、2、4、8、16、32、64 mg F-/L组9个不同的氟浓度处理成骨细胞MC3T3-E1 2、7、14 d后,每个时间段设置对照组,CCK8检测细胞的增殖;2、8、20 mg F-/L处理细胞,流式细胞仪检测不同浓度氟对成骨细胞MC3T3-E1凋亡的影响;qRT-PCR检测细胞中与分化相关的基因的表达;Western blot检测内质网应激信号通路相关蛋白的表达。结果低浓度氟(2、4mg F-/L)和中浓度氟(8 mg F-/L)显著增强细胞的增殖(P0.05),高浓度氟(16 mg F-/L)显著降低细胞的增殖(P0.05);2、8、20 mg F-/L处理成骨细胞MC3T3-E1,细胞凋亡率显著高于0 mg F-/L(P0.01),且随着浓度的增加凋亡率变大;2 mg F-/L促进细胞内ALP、OCN、Runx2和Osterix的mRNA表达,20 mg F-/L则抑制上述因子的mRNA表达(P0.01);2、8、20 mg F-/L处理MC3T3-E1细胞中Xbp1、AFT4、Bip和PERK的蛋白表达量都高于0 mg F-/L,其中2 mg F-/L处理细胞中Xbp1和AFT4蛋白表达最多(P0.01),8 mg F-/L处理细胞中PERK的蛋白表达量最多(P0.01),20 mg F-/L处理细胞中Bip蛋白表达量最多(P0.01)。结论低浓度氟促进成骨细胞MC3T3-E1增殖和分化,高浓度则抑制,细胞凋亡率随氟浓度增加而增加,不同氟浓度处理促进成骨细胞中内质网应激信号通路相关蛋白的表达。     

淫羊藿苷通过雌激素受体和p38MAPK信号诱导MC3T3-E1Subclone14细胞的分化

目的观察淫羊藿苷(ICA)对MC3T3-E1Subclone14前体成骨细胞株活力、分化的影响,以及雌激素受体(ER)信号、p38MAPK信号在分化过程中的作用。方法 WST-8方法检测MC3T3-E1Subclone14细胞活力;pNPP法检测细胞碱性磷酸酶活性(ALP);ELISA检测I型胶原(ColI)和骨钙素(BGP);Western印迹法检测p38MAPK的蛋白磷酸化;并分别用ICI182780阻断ER受体或SB203580阻断p38MAPK信号后检测ICA对细胞ALP、Col I、BGP的影响;Western印迹法检测ICI182780阻断ER受体信号后,ICA对p38MAPK蛋白磷酸化的影响。结果 ICA(10-7、10-6、10-5mol/L)对细胞活力与对照组比较,在统计学上无显著差异(P>0.05);ICA可以浓度依赖性的提高细胞的ALP、Col I和BGP和矿化结节数量(P<0.01,P<0.05);ICI182780阻断ER受体信号后,10-5mol/L浓度的ICA促细胞分化的特性明显下降(P<0.01);ICA可以浓度组依赖性的提高细胞p38MAPK的蛋白磷酸的水平(P<0.01);SB203580阻断p38MAPK信号后,10-5mol/L浓度的ICA促分化的特性下降(P<0.01);ICI182780阻断ER受体信号后,10-5mol/L浓度ICA促p38MAPK磷酸化明显减弱(P<0.01)。结论 ICA可以促进MC3T3-E1Subclone14细胞分化,ER受体信号、p38MAPK信号在促分化过程中起着重要作用,ER受体信号通路在p38MAPK信号通路的上游。     

17β-雌二醇和1,25-二羟维生素D3对成骨细胞MC3T3-E1增殖和分化的影响

目的 探讨雌激素和维生素D对成骨细胞MC3T3-E1增殖和分化的协同调节作用及其机制.方法 小鼠成骨细胞系MC3T3-E1细胞用无酚红α-MEM完全培养基培养;用MTT法检测细胞增殖率;用实时荧光定量PCR法检测干预前后MC3T3-E1细胞中细胞周期相关基因[细胞周期素E( cyclin E)、增殖细胞核抗原(PCNA)和细胞周期素依赖性激酶抑制物(Cdkn2b)]和成骨细胞分化标志物[Ⅰ型胶原( COL Ⅰ)、碱性磷酸酶(ALP)和骨桥蛋白(OPN)]基因的表达.ALP活性染色用BCIP/NBT显色法.结果 单用雌激素17β-雌二醇(E2)可促进MC3T3-E1细胞的增殖,尤其在生理浓度时作用最强,单用维生素D活性产物1,25-二羟维生素D3[1,25-(OH) 2D3]对MC3T3-E1细胞的增殖无影响,1,25 - (OH)2 D3不影响E2对MC3T3-E1细胞的促增殖作用.E2上调MC3T3-E1细胞中cyclin E和PCNA的表达,同时下调Cdkn2b基因的表达,1,25-(OH)2D3单独应用不能影响上述基因表达的变化,也不影响E2对上述基因的调节作用.E2可促进MC3T3-E1细胞中分化标志物(COLⅠ、ALP和OPN)基因的表达,加用1,25-(OH)2D3后可增强此作用.结论 雌激素和维生素D作为两种重要的调节骨代谢的激素,在促进成骨细胞增殖方面可能无协同作用,而在促进其分化方面可能有协同作用.     

基于PI3K/AKT信号通路研究丹酚酸B对成骨细胞骨形成的调控作用

目的探讨磷脂酰肌醇3激酶/蛋白激酶B(PI3K/AKT)信号通路在丹酚酸B对成骨细胞骨形成的调控作用。方法 0.00、0.01、0.03、0.10、0.30、1.00 nmol/L的丹酚酸B作用MC3T3-E1细胞12、24、36 h,MTT法检测细胞活力,RT-PCR法检测碱性磷酸酶(ALP)、骨桥蛋白(OPN)、Ⅰ型胶原蛋白(COLⅠ)、骨钙素(OCN)mRNA表达,Western印迹检测细胞中ALP、OPN、COLⅠ、OCN及PI3K/AKT信号通路相关蛋白的表达。结果与0.00 nmol/L比较,0.03、0.10、0.30 nmol/L丹酚酸B组细胞活力显著提高(P0.01),ALP、OPN、COLⅠ、OCN蛋白及mRNA表达量上调(P0.01),PI3K及p-AKT表达量上调(P0.01);而LY294002组ALP、OPN、COLⅠ及OCN蛋白及mRNA表达量下调(P0.01),PI3K及p-AKT表达量下调(P0.01)。与LY294002组比较,丹酚酸B+LY294002组ALP、OPN、COLⅠ、OCN蛋白及mRNA表达量上调(P0.01),PI3K及p-AKT表达量上调(P0.01)。结论丹酚酸B通过激活PI3K/AKT信号通路促进MC3T3-E1细胞骨形成。     

氟诱导成骨细胞MC3T3-E1自噬与凋亡及其相互作用分析

目的主要研究氟诱导成骨细胞MC3T3-E1发生自噬、凋亡及两者之间的关系。方法利用3-(4,5-二甲基噻唑-2)-2,5-二苯基四氮唑溴盐(MTT)比色法检测氟对成骨细胞MC3T3-E1的增殖活性影响,探寻氟引起凋亡的浓度;流式细胞术检测细胞凋亡;western blot免疫印记技术检测凋亡相蛋白;利用western blot免疫印记技术检测Beclin 1蛋白及LC3蛋白表达水平及变化。结果氟能明显抑制成骨细胞MC3T3-E1增殖,诱发细胞凋亡,其抑制作用呈时间、剂量依赖性;氟在促进细胞凋亡的同时也促进自噬产生;3-甲基腺素(3-MA)抑制自噬后,氟诱导的凋亡进一步增多。结论氟明显抑制MC3T3-E1细胞增殖,同时诱发细胞凋亡和自噬;氟诱导的自噬部分拮抗其诱导的凋亡。     

去铁酮对小鼠前成骨细胞MC3T3-E1生物学活性的影响

目的研究铁螯合剂去铁酮(deferiprone,DFP)体外对成骨细胞增生、分化以及细胞铁代谢的影响。方法体外培养小鼠前成骨样细胞MC3T3-E1,在10 mmo L/Lβ-甘油磷酸和50μg/m L抗坏血酸的诱导下,分化为成骨细胞,同时用不同浓度(25、50、100μmol/L)DFP干预,用CCK-8法检测细胞的增生,碱性磷酸酶(alkaline phosphatase,ALP)活性试剂盒检测细胞ALP活性,实时定量PCR检测细胞膜转铁蛋白受体(transferrin receptor,TfR)mRNA的表达。结果 MC3T3-E1细胞增生结果显示,DMSO溶剂组、对照组(0μmol/L)和DFP 25、50、100μmol/L组A值分别为1.36±1.10、1.41±0.09、0.78±0.06、0.68±0.03、0.46±0.01;ALP活性检测结果显示,对照组(0μmol/L)和DFP 25、50、100μmol/L组ALP活性值分别为0.83±0.05、0.75±0.04、0.64±0.03、0.51±0.03;TfR mRNA表达检测结果显示,对照组(0μmol/L)和DFP 25、50、100μmol/L组表达比分别为1、1.16±0.05、1.32±0.06、2.30±0.11。MC3T3-E1细胞的增生、ALP活性随DFP干预浓度的增加呈剂量依赖性下降(P0.05),TfR mRNA的表达随DFP干预浓度的增加呈剂量依赖性上升(P0.05)。结论 DFP可能通过螯合成骨细胞内的铁离子抑制其增生、分化。     

硫辛酸对体外培养的MC3T3-E1成骨细胞骨形成的影响

目的研究硫辛酸对体外培养的H2O2处理后的小鼠前成骨细胞MC3T3-E1骨形成的影响,并初步探讨硫辛酸促成骨细胞骨形成的作用机制。方法在体外培养的MC3T3-E1培养基中分别加入不同浓度(0.1、0.2和0.4 mmol/L)的硫辛酸作用20 h,接着加入1 mmol/L H2O2作用4 h,用MTT法检测药物对成骨细胞活力的影响;用碱性磷酸酶(alkaline phosphatase,ALP),细胞丙二醛(malondialdehyde,MDA),超氧化物歧化酶(superoxide dismutase,SOD),乳酸脱氢酶(lactate dehydrogenase,LDH)试剂盒检测成骨细胞内ALP、SOD、LDH活性和MDA含量;用Von Kossa染色法检测矿化结节数目;用real time-PCR方法检测成骨细胞内Ⅰ型胶原(collagen-Ⅰ,COL-Ⅰ)、骨钙素(osteocalcin,OCN)、转录因子Osterix、骨形态发生蛋白2(bone morphogenetic protein-2,BMP-2)、NADPH氧化酶4(NADPH oxidase4,Nox4)、护骨素(osteoprotegerin,OPG)、细胞核因子κB受体活化因子配基(receptor activator nuclear factor-kappa B ligand,RANKL)mRNA表达,用流式细胞仪检测细胞内活性氧(reactive oxygen species,ROS)水平。结果硫辛酸可增加ALP活力和矿化结节数目,促进骨形成相关指标COL-Ⅰ、Osterix、BMP-2和OCN mRNA表达(P0.05);硫辛酸提高H2O2损伤后MC3T3-E1细胞活力,上调细胞内SOD活性并降低细胞中MDA含量和上清中LDH活性;硫辛酸上调MC3T3-E1细胞OPG/RANKL比值及下调ROS和Nox4 mRNA表达水平(P0.05)。结论硫辛酸在一定浓度范围内(0.1~0.4 mmol/L)促进H2O2处理后MC3T3-E1细胞的骨形成过程,这种促进作用是通过下调Nox4和ROS水平,降低氧化应激发挥抗氧化作用上调OPG/RANKL实现的。     

地拉罗司对小鼠前成骨细胞MC3T3-E1生物学活性的影响

目的探讨铁鳌合剂地拉罗司(deferasirox,DFS)体外对成骨细胞增生、分化、矿化和细胞内铁离子的影响。方法小鼠前成骨样细胞MC3T3-E1在37℃条件下体外培养,在10 mmol/Lβ-甘油磷酸和50 mg/L抗坏血酸的诱导作用下,分化为成骨细胞,同时用不同浓度(10、20、40μmol/L)DFS干预,用CCK-8法检测细胞的增生,碱性磷酸酶(alkaline phosphatase,ALP)活性试剂盒检测细胞ALP活性,Von kossa染色法行细胞钙结节染色,实时定量PCR检测细胞膜转铁蛋白受体(transferrin receptor,TfR)mRNA的表达。结果 MC3T3-E1细胞增生结果显示,DMSO溶剂组、对照组(0μmol/L)、10、20、40μmol/L组A值分别为1.41±0.09、1.41±0.09、1.01±0.01、0.79±0.04、0.67±0.04;ALP活性检测结果显示,对照组(0μmol/L)、10、20、40μmol/L组ALP活性值分别为0.73±0.03、0.65±0.02、0.54±0.03、0.35±0.04;钙结节检测结果显示,对照组(0μmol/L)、10、20、40μmol/L组TfR mRNA钙化面积比值分别为4.22±0.12、3.29±0.14、1.40±0.20、0.86±0.21;TfR mRNA表达检测结果显示,对照组(0μmol/L)、10、20、40μmol/L组TfR mRNA表达比分别为1、1.52±0.23、1.91±0.17、2.98±0.14。MC3T3-E1细胞的增生、ALP活性、钙结节和钙化面积随DFS干预浓度的增加呈剂量依赖性降低(P0.05),TfR mRNA的表达随DFS干预浓度的增加呈剂量依赖性升高(P0.05)。结论 DFS可能通过螯合成骨细胞内的铁离子抑制其增生、分化和矿化。     

Normal matrix mineralization induced by strontium ranelate in MC3T3-E1 osteogenic cells

There is growing evidence that strontium ranelate (SR; S12911-2, PROTELOS; Institut de Recherches Internationales Servier, Courbevoie, France), a compound containing 2 atoms of stable strontium (Sr), influences bone cells and bone metabolism in vitro and in vivo. We previously reported that SR increases bone mass in rats and mice by stimulating bone formation and inhibiting bone resorption. We also showed that short-term treatment with SR enhances osteoblastic cell recruitment and function in short-term rat calvaria cultures. Because Sr incorporates into the bone matrix, it was of interest to determine whether SR may affect matrix mineralization in long-term culture. To this goal, osteogenic mouse calvaria-derived MC3T3-E1 osteoblastic cells were cultured for up to 14 days in the presence of ascorbic acid and phosphate to induce matrix formation and mineralization. Matrix formation was determined by incorporation of tritiated proline during collagen synthesis. Matrix mineralization was quantified by measuring the number and surface of mineralized nodules using a digital image analyzer. In this model, 1,25(OH)2 vitamin D (1 nmol/L) used as internal control, increased alkaline phosphatase (ALP) activity, an early osteoblast marker, on days 4, 10, and 14 of culture. Treatment with SR (1 mmol/L Sr(2+)) increased ALP activity at days 4 and 14 of culture. SR also increased collagen synthesis at days 4 and 10 of culture. In contrast, 1,25(OH)2 vitamin D (1 nmol/L) inhibited collagen synthesis at 4 to 14 days of culture. Long-term treatment with SR (0.1 to 1 mmol/L Sr(2+)) dose dependently increased Sr concentration into the calcified nodules, but did not alter matrix mineralization in long-term culture, as shown by the ratio of the surface of mineralized nodules to the number of mineralized nodules on day 14 of culture. These results show that long-term treatment with SR increases collagenous matrix formation by MC3T3-E1 osteoblasts without inducing deleterious effect on matrix mineralization.     

Methotrexate (MTX) inhibits osteoblastic differentiation in vitro: possible mechanism of MTX osteopathy

OBJECTIVE: To clarify the mechanism of impaired bone formation during low dose methotrexate (MTX) therapy. METHODS: The in vitro effects of MTX on the function and differentiation of osteoblastic cells were investigated using (1) a mouse osteogenic cell line (MC3T3-E1) with the capacity to differentiate into osteoblastic or osteocytes, (2) a human osteoblastic osteosarcoma cell line (SaOS-2) with a mature osteoblastic phenotype, and (3) mouse bone marrow stromal cells containing osteoblast precursors. Osteoblast function was assessed by measuring the cellular activity of alkaline phosphatase (ALP) and the mineralization capacity of cultures. RESULTS: MTX suppressed ALP activity dose-dependently in growing MC3T3-E1 cells, but proliferation of these cells was only inhibited by a high concentration of MTX. In contrast, inhibition of ALP activity in MC3T3-E1 cells of mature osteoblastic phenotype was only observed with 10(-8) M and 10(-7) M MTX, and proliferation was not influenced. ALP activity and the proliferation of SaOS-2 cells were not inhibited by MTX, even when growing cells were treated. However, both ALP activity and formation of calcified nodules in bone marrow stromal cell cultures were significantly suppressed by MTX at concentrations between l0(-10) and 10(-7) M. CONCLUSION: These results suggest that MTX suppresses bone formation by inhibiting the differentiation of early osteoblastic cells.     

3-Methylcholanthrene,which binds to the arylhydrocarbon receptor,inhibits proliferation and differentiation of osteoblasts in vitro and ossification in vivo

3-Methylcholanthrene (3MC) is a ligand for arylhydrocarbon receptor (AhR), which binds dioxin. We examined the effects of 3MC on the proliferation and differentiation of osteoblasts using cultures of rat calvarial osteoblast-like cells (ROB cells) and mouse calvarial clonal preosteoblastic cells (MC3T3-E1 cells). Analysis by RT-PCR revealed that the mRNAs for AhR and AhR nuclear translocators were expressed in both ROB and MC3T3-E1 cells. Cell proliferation and the synthesis of DNA by ROB cells and MC3T3-E1 cells were markedly inhibited on exposure of cells to 3MC. Furthermore, 3MC reduced the activity of alkaline phosphatase and the rate of deposition of calcium by cells. The level of expression of mRNA for osteocalcin, which is a marker of osteoblastic differentiation, was also depressed by 3MC. Moreover, when 3MC (1 mg/kg body weight) was administered sc to pregnant mice at 10.5, 12.5, and 14.5 d post coitus, fetuses examined subsequently at 15.5 or 17.5 d post coitus revealed evidence of inhibition of appropriate calcification of bones. The treated metacarpals showed no subperiosteal bone matrix histologically. Our findings indicate that 3MC might have critical effects on the formation of bone both in vivo and in vitro.     

人牙周膜干细胞条件培养液对MC3 T3-E1细胞形态及增殖特性的影响

目的 研究人牙周膜干细胞(hPDLSCs)-条件培养液(CM)对MC3T3-E1细胞形态及增殖特性的影响.方法 从健康前磨牙及第三磨牙的牙周膜(牙周韧带)组织分离hPDLSCs并进行培养,采用免疫荧光法检测所得细胞中波形丝蛋白(vimentin)、角蛋白(PCK)及早期间充质干细胞标志物STRO-1的表达,鉴定细胞来源...     

Interleukin (IL)-4 and IL-13 inhibit the differentiation of murine osteoblastic MC3T3-E1 cells

Interleukin-4 (IL-4) inhibits the spontaneous and stimulated bone resorption resulting from the inhibition of osteoclast formation, as well as osteoclastic activity. Since IL-13 shares some biological properties with IL-4, it was recently reported that IL-13 inhibits bone resorption. The present study was designed to determine the effects of murine IL-4 (IL-4) and murine IL-13 (IL-13) on the murine osteoblastic cell line MC3T3-E1. IL-4 and IL-13 stimulated 3H-thymidine incorporation in the MC3T3-E1 cells and its proliferation in dose dependent manners. A spontaneous increase in alkaline phosphatase (ALP) activity in the cells after plating was inhibited by IL-4 or IL-13, and both cytokines blunted an increase in ALP activity by human parathyroid hormone (PTH) (1-34). PTH-stimulated cyclic AMP (cAMP) production was inhibited by pretreatment with IL-4 and IL-13 for 48 hr in dose dependent manners. Pretreatment with IL-4 and IL-13 for 48 hr caused a decrease in PTH-induced cAMP production at any stimulatory concentration. However, the effective dose (ED50) was unchanged by the pretreatment with these cytokines. Pretreatment with IL-4 and IL-13 did not modulate cAMP generation by forskolin. In contrast, cAMP generation by PGE2 is greater in the cells treated with the cytokines compared to those without the cytokines. These results indicate that IL-4 and IL-13 act on MC3T3-E1 cells in the same manner, stimulating cell proliferation, but inhibiting cell differentiation. The inhibition of osteoblast differentiation by IL-4 and IL-13 may be associated with a decrease in PTH actions on osteoblasts.