淫羊藿苷促前成骨细胞MC3T3-E1成骨分化的实验研究

目的探讨淫羊藿苷(icariin,ICA)促进前成骨细胞MC3T3-E1成骨分化的机制。方法采用不同浓度(10~(-10)~10~(-5)mol/L)的ICA干预前成骨细胞MC3T3-E1 3、6、9天后采用碱性磷酸酶(alkaline phosphatase,ALP)活性检测试剂盒测定ALP活性,确定ICA最适促分化浓度。最适ICA浓度干预前成骨细胞MC3T3-E1 7天后应用实时定量PCR法(real time-polymerase chain reaction,RT-PCR)检测骨形态发生蛋白(BMP)和Wnt/β-catenin信号通路相关分子(BMP-2、Runx2、β-catenin、cyclin D1)基因表达。ICA分别与BMP、Wnt/β-catenin信号通路抑制剂(Noggin、DKK-1)联合干预前成骨细胞MC3T3-E1后,茜素红钙结节染色观察钙化程度以及Western blot检测BMP-2蛋白表达变化。结果 ICA促进前成骨细胞MC3T3-E1成骨分化,且10~(-9)mol/L ICA促进分化的能力最强。与对照组比较,ICA能明显上调BMP和Wnt/β-catenin信号通路相关分子(BMP-2、Runx2、β-catenin、cyclin D1)mRNA表达(P0.01)。Noggin或DKK-1能抑制前成骨细胞MC3T3-E1钙化,且两者联合作用时抑制更加明显。与ICA单独作用比较,ICA与DKK1联合干预后BMP-2蛋白表达水平下降(P0.01)。结论 ICA可能通过Wnt/β-catenin/BMP-2信号通路调控前成骨细胞MC3T3-E1的成骨分化。     

三七总皂苷对MC3T3-E1细胞增殖和成骨分化的影响

目的 探讨三七总皂苷对激素性股骨头坏死的保护作用。方法 采用CCK-8法检测三七总皂苷(1～1 000 mg/L)和地塞米松(10μmol/L)对MC3T3-E1细胞增殖的影响，偶氮偶联法检测三七总皂苷(10、50、100 mg/L)和地塞米松对MC3T3-E1细胞ALP活性的影响，茜素红染色法检测三七总皂苷和地塞米松对细胞矿化的影响，RT-qPCR法和免疫荧光染色法检测三七总皂苷和地塞米松对细胞蛋白Col-Ⅰ、OCN、OPN蛋白和mRNA表达的影响，Western blot法检测三七总皂苷和地塞米松对细胞Runx2蛋白和Wnt/β-catenin通路靶蛋白表达的影响。结果 10μmol/L地塞米松能抑制MC3T3-E1细胞增殖。与正常组比较，10～100 mg/L三七总皂苷能促进MC3T3-E1细胞增殖(P<0.05),并可降低地塞米松对细胞增殖的抑制作用(P<0.01)。此外，三七总皂苷能降低地塞米松对MC3T3-E1细胞ALP活性和钙沉积的抑制作用(P<0.01),地塞米松可降低MC3T3-E1细胞Col-I、Runx2、OCN、OPN蛋白表达和Wnt/β-ca...     

JNK通路对左归丸含药血清调控MC3T3 成骨细胞Runx2 mRNA表达的影响

目的:探讨c-Jun氨端激酶(JNK)信号通路在左归丸含药血清调控成骨前体细胞(MC3T3-E1)增殖和成骨特异转录因子核心结合因子(Runx2) mRNA表达中的作用.方法:以MC3T3-E1为研究对象,制备左归丸含药血清,选用JNK特异抑制剂SP 600125,实验分为空白对照组、SP 600125组、左归丸组、左归丸加SP 600125组、倍美力组、倍美力加SP 600125组.孵育48 h后,采用噻唑蓝(MTT)法检测SP600125对左归丸含药血清干预MC3T3-E1成骨前体细胞增殖作用的影响,采用Western blot法分析JNK蛋白磷酸化水平,采用Real Time RT-PCR法检测成骨细胞特异转录因子Runx2 mRNA表达情况.结果:与空白对照组比较,左归丸含药血清组显著促进细胞增殖,明显上调p-JNK蛋白和Runx2 mRNA表达(P＜0.01);SP600125显著抑制左归丸含药血清诱导的增殖和p-JNK蛋白表达(P＜0.01),对Runx2 mRNA表达的影响不显著.结论:JNK信号通路的激活可能参与了左归丸含药血清诱导的MC3T3-E1成骨前体细胞增殖,但左归丸含药血清诱导的Runx2mRNA高表达对JNK信号通路依赖不显著.     

白芍总苷对小鼠成骨细胞增殖、分化和矿化的影响

目的研究白芍总苷(TGP)对小鼠成骨细胞(MC3T3-E1)增殖、分化和矿化的影响。方法采用MTT法和流式细胞术检测TGP对MC3T3-E1细胞增殖和细胞周期的影响;诱导MC3T3-E1成骨分化,通过检测碱性磷酸酶(ALP)活性和RT-PCR法检测人类相关转录因子2(Runx2)基因表达,分析TGP对成骨分化的影响,采用茜素红染色分析TGP对矿化的影响。结果 3、10μg/L TGP均能促进MC3T3-E1细胞增殖(P0.05,P0.01);10μg/L TGP可使G1期细胞的比例减少,S+G2期细胞的比例增加(P0.05);与对照组比较,TGP处理组细胞的ALP活性和Runx2表达水平显著升高(P0.05,P0.01),且矿化结节量明显增加。结论 TGP具有促进MC3T3-E1细胞增殖和分化成熟的能力,为炎性骨质疏松的治疗策略提供了实验依据和治疗思路。     

淫羊藿总黄酮胶囊活性成分宝藿苷Ⅱ对MC3T3-E1细胞增殖分化的影响

目的:从淫羊藿总黄酮胶囊中制备分离宝藿苷Ⅱ,检测不同浓度宝藿苷II对体外培养的MC3T3-E1细胞增殖分化的影响。方法:分别用10、20、40nmol/ml的宝藿苷II作用MC3T3-E1细胞,CCK-8法检测细胞存活率;比色法测定碱性磷酸酶(ALP)活力;ELISA法检测骨钙素(OT)含量;茜素红染色分析并用氯化十六烷基吡啶测定钙沉积量;Western Blot法检测宝藿苷Ⅱ对BMP2信号通路蛋白表达的影响。结果:10、20、40nmol/ml的宝藿苷Ⅱ均可明显促进MC3T3-E1的增殖;提高MC3T3-E1分泌ALP和OT的能力;矿化结节数量明显增多且钙沉积量吸光度值显著增大;明显提高BMP2、Runx2和Osterix蛋白表达量,且呈剂量依赖性。结论:淫羊藿总黄酮胶囊活性成分宝藿苷II可以明显促进MC3T3-E1细胞的增殖分化。     

补肾健脾活血方对高糖环境下MC3T3-E1细胞的成骨分化及凋亡的影响

目的探讨补肾健脾活血方对高糖环境下MC3T3-E1细胞的成骨分化和凋亡的影响。方法以MC3T3-E1细胞为研究对象,制备补肾健脾活血方含药血清,实验分为空白对照组、高糖组、中药低剂量组、中药中剂量组、中药高剂量组、二甲双胍组。采用流式细胞术检测MC3T3-E1成骨细胞凋亡,蛋白质免疫印记技术(Western-blot)检测来观察成骨分化相关蛋白的表达。结果与高糖组相比,中药组对高糖(25mmol/L)条件下MC3T3-E1细胞能够一定程度上抑制成骨细胞凋亡,以中药中剂量组效果更为显著(P0.01);高糖条件下的中药组能够促进成骨分化相关蛋白BMP2和Runx2的表达,以中药高剂量组效果较为显著(P0.01)。结论补肾健脾活血方能够促进高糖环境下MC3T3-E1成骨细胞分化和抑制凋亡的作用。     

两种杜仲黄酮类化合物对成骨细胞OPG/RANKL及成骨相关转录因子的影响

目的:研究杜仲黄酮类化合物紫云英苷和黄芩素对成骨细胞特异性转录因子Osterix及破骨细胞抑制因子与核因子κB受体活化因子配体比值(OPG/RANKL)的影响。方法:采用MC3T3-E1 Subclone 14成骨细胞,不同浓度紫云英苷和黄芩素和维生素D3组加入质量浓度为30 mg·L-1作用细胞24 h后,用MTT法检测细胞增殖情况,成骨细胞接种于24孔板后,空白组加入培养基,给药组分别加入质量浓度为80 mg·L-1(高浓度),40 mg·L-1(中浓度),7.5 mg·L-1(低浓度)的含紫云英苷或黄芩素,作用24 h后,ELISA法检测钙离子活性,蛋白免疫印迹法检测Osterix,OPG以及RANKL的蛋白表达水平。结果:与空白组相比,紫云英苷和黄芩素可后明显促进MC3T3-E1 Subclone 14成骨细胞的增殖(P<0.05);明显上调OPG和Osterix的表达(P<0.05),同时能降低RANKL的表达(P<0.05)。结论:杜仲黄酮类化合物紫云英苷和黄芩素能促进MC3T3-E1Subclone 14成骨细胞增殖,并上调Osterix和OPG/RANKL。     

六味地黄丸含药血清对MC3T3-E1细胞增殖以及对Runx2、FOXO1 mRNA表达的影响

目的探讨六味地黄丸含药血清对MC3T3-E1细胞增殖以及对Runx2、FOXO1 mRNA表达的影响。方法制作六味地黄丸混悬液,对成年Wistar大鼠进行灌胃,获取六味地黄丸含药血清。常规培养MC3T3-E1细胞24 h后更换含10%不同浓度含药血清的培养基,分别培养48 h和72 h后用CCK-8法检测MC3T3-E1细胞的增殖;对MC3T3-E1细胞进行诱导培养22天后进行饥饿培养24h,随后更换含10%不同浓度的含药血清,培养72 h后检测Runx2、FOXO1 mRNA表达。结果六味地黄丸含药血清能促进MC3T3-E1细胞增殖,并且呈现一定的剂量依赖性;同时六味地黄丸含药血清各剂量组均能明显促进Runx2 mRNA的表达(P0.01),高剂量组的表达明显高于低剂量组(P0.01)。高剂量组的FOX01 mRNA表达明显高于其他3组(P0.01)。结论六味地黄丸含药血清能促进MC3T3-E1细胞增殖,同时能促进Runx2、FOXO1 mRNA表达。     

补肾活血固齿方对大鼠MC3T3-E1细胞BMP2表达及超微结构的影响

目的:研究补肾活血固齿方对小鼠颅顶前成骨细胞(MC3T3-E1细胞)BMP2表达及超微结构的影响,探讨该方剂治疗牙周炎的作用机理。方法:MC3T3-E1细胞分别于补肾活血固齿方含药血清、无药血清中培养24、48、72 h,ELISA法检测MC3T3-E1细胞BMP2的表达;培养14 d后,透射电镜观察MC3T3-E1细胞超微结构的变化。结果:含药血清组培养上清液的光密度值明显高于无药血清组,统计结果显示差异有显著性(P0.05)。MC3T3-E1细胞经药物作用后呈现成骨细胞样表型,细胞表面突起变多,核卵圆形、较大,核膜凹陷,核仁明显;胞质丰富,粗面内质网扩张明显,网腔内充满低电子密度絮状物;高尔基复合体、线粒体发达,具有良好的的分泌功能,细胞代谢活跃。结论:补肾活血固齿方能促进MC3T3-E1细胞分泌BMP2,参与诱导成骨作用;补肾活血固齿方能诱导MC3T3-E1细胞呈成骨细胞样表型,促进成骨细胞的分化生长。     

黄芪甲苷对MC3T3-E1细胞活性的影响及其机制探讨

目的:探讨黄芪甲苷对小鼠胚胎成骨细胞MC3T3-E1细胞活性的影响及其作用机制。方法:体外培养MC3T3-E1细胞,用不同浓度的黄芪甲苷进行预处理后,MTT法测定细胞增殖情况,碱性磷酸酶法(ALP)测定细胞分化情况,Western blotting分析转化生长因子TGF-β1、成骨细胞信号转导蛋白Smad2/3表达水平;应用小干扰RNA(siRNA)转染法观察TGF-β1 siRNA对MC3T3-E1细胞增殖及活性的影响,加入抗Smad2/3抗体,探讨Smad2/3在黄芪甲苷介导的细胞增殖分化中的作用。结果:黄芪甲苷在一定浓度范围内剂量依赖性促进MC3T3-E1细胞的增殖和分化能力。进一步机制分析表明,黄芪甲苷处理可诱导TGF-β1蛋白表达,TGF-β1siRNA处理后,黄芪甲苷诱导的MC3T3-E1细胞的增殖和分化能力明显下降;此外,黄芪甲苷可显著性诱导Smad2/3表达,经TGF-β1 siRNA处理后,黄芪甲苷诱导的Smad2/3表达显著下降;加入Smad2/3抗体后,黄芪甲苷诱导的MC3T3-E1细胞的增殖和分化能力明显下降。结论:黄芪甲苷可通过刺激TGF-β1-Smad2/3通路的活化促进成骨细胞的增殖和分化,从而有利于骨形成。因此,本研究将为骨折愈合的治疗提供新的研究方向。     

Effect of safflower seeds supplementation on stimulation of the proliferation, differentiation and mineralization of osteoblastic MC3T3-E1 cells

Anti-bone resorption properties of the Korean herbal formulation, Gami-Honghwain (HJ), which comprises Carthamus tinctorius L. seed and hominis placenta, were investigated. We demonstrate that the production of PGE2 is inhibited by 20-100 microg/ml HJ in nontransformed osteoblastic cells (MC3T3-E1 cells), indicating that HJ inhibits PGE2 production. The effect of HJ on the proliferation and osteoblastic differentiation in MC3T3-E1 was also studied. HJ dose-dependently increased DNA synthesis (significant at 20-100 microg/ml), and increased alkaline phosphatase (ALP) and prolyl hydroxylase activities of MC3T3-E1 cells (20-100 microg/ml), while anti-estrogen tamoxifen eliminated the stimulation of proliferation and ALP activity of MC3T3-E1 which was induced by HJ. These results indicate that HJ directly stimulates cell proliferation and differentiation of osteoblasts. Also, when we assessed the effects of HJ on osteoblastic differentiation in MC3T3-E1, HJ enhanced ALP activity and mineralization in a dose- and time-dependent fashion. This stimulatory effect of the HJ was observed at relatively low doses (significant at 20-100 microg/ml and maximal at 100 microg/ml). Northern blot analysis showed that the HJ (60 microg/ml) increased in bone morphogenetic protein-2 as well as ALP mRNA concentrations in MC3T3-E1 cells. HJ (100 microg/ml) slightly increased in type I collagen mRNA abundance throughout the culture period, whereas it markedly inhibited the gene expression of collagenase-1 between days 15 and 20 of culture. These results indicate that HJ has anabolic effect on bone through the promotion of osteoblastic differentiation, suggesting that it could be used for the treatment of common metabolic bone diseases.     

Stimulative effects of Drynariae Rhizoma extracts on the proliferation and differentiation of osteoblastic MC3T3-E1 cells

Pharmacological factors are needed to prevent bone loss that occurs with increasing age. The chemical compounds that act on bone metabolism in herbal medicines, however, are poorly understood. Effects of traditional Korean medicine, Drynariae Rhizoma [Drynaria fortunei (kunze) J. Sm] extract (DR), on the osteoblastic proliferation and differentiation were investigated. The effect of DR, a natural phyto herb, on the proliferation and osteoblastic differentiation in non-transformed osteoblastic cells (MC3T3-E1) was studied. DR dose-dependently increased DNA synthesis (significant at 50-150 microg/ml). DR increased alkaline phosphatase (ALP) activity and prolyl hydroxylase activity of MC3T3-E1 cells (50-150 microg/ml). Antiestrogen tamoxifen eleminated the stimulation of proliferation and ALP activity of MC3T3-E1, which were induced by DR. DR at concentrations ranged from 30-100 microg/ml inhibited prostaglandin E2 production in MC3T3-E1. These results indicate that DR directly stimulates cell proliferation and differentiation of osteoblasts. These results also suggest and DR is effective for bone anti-resorptive action in bone cells.     

Stimulative effects of Ulmus davidiana Planch (Ulmaceae) on osteoblastic MC3T3-E1 cells

Ulmus davidiana Planch (Ulmaceae) has long been known to have anti-inflammatory and protective effects on damaged tissue, inflammation and bone among other functions. To treat rheumatoid arthritis (RA), a herbal medicine, Ulmus davidiana Planch (Ulmaceae) extract (UD) is being used in traditional oriental medicine. The effect of UD on the proliferation and osteoblastic differentiation in non-transformed osteoblastic cells (MC3T3-E1) was studied. UD dose-dependently increased DNA synthesis (significant at 5-20 microg/ml). UD increased alkaline phosphatase (ALP) activity and prolyl hydroxylase activity of MC3T3-E1 cells (5-20 microg/ml). Antiestrogen tamoxifen eliminated the stimulation of proliferation and ALP activity of MC3T3-E1, which was induced by UD. UD at concentrations ranged from 30 to 100 microg/ml inhibited prostaglandin E2 production in MC3T3-E1. These results indicate that UD directly stimulates cell proliferation and differentiation of osteoblasts. These results also suggest and UD is effective for bone anti-resorptive action in bone cells.     

新疆马鹿角提取物对MC3T3-E1成骨细胞RANKL/OPGmRNA表达的影响

目的 研究新疆马鹿角提取物对MC3T3-E1成骨细胞核因子-kβ受体活化因子配体(RANKL)/护骨素(OPG)mRNA表达的影响.方法 体外培养MC3T3-E1成骨细胞,分别加入含不同剂量新疆马鹿角提取物的培养液,72 h后分别提取细胞总RNA,用RT-PCR方法检测RANKL/OPG mRNA表达.结果 培养72 h后RANKL/OPG mRNA表达的灰度值(0.312±0.0710),与对照组(2.017±0.1320)比较,新疆马鹿角提取物呈浓度依赖性降低RANKL mRNA的表达,增加OPG mRNA的表达,各剂量组RANKL/OPG mRNA吸光度比值降低.结论 新疆马鹿角提取物可能通过调节成骨细胞RANKL/OPG的基因表达,而抑制破骨细胞介导的骨吸收.