异烟肼对大鼠成骨细胞影响的观察

目的：研究异烟肼（isoniazid，INH）对大鼠成骨细胞（osteoblasts，OB）增殖、碱性磷酸酶（Alkaline phosphatase，ALP）活性和Ⅰ型胶原合成的影响。方法：分离、培养新生SD大鼠头盖骨OB，分别加入不同浓度的INH（1、10、20、40、60、100、1000μg／ml）共同培养96h，对照组不加INH，分别采用四唑盐（MTT）比色实验、ALP活性测定法和^3H—Proline（^3氢-脯氨酸）法测定OB增殖、ALP活性和Ⅰ型胶原合成的情况。结果：与对照组比较，INH在60μg／ml即可抑制大鼠OB增殖（P〈0．05），40μg／ml时大鼠成骨细胞ALP活性明显下降（P〈0．05）．20μg/ml时大鼠成骨细胞Ⅰ型胶原合成（P〈0．05）明品减少，且都随浓度增加抑制作用加强。结论：INH存较低浓度时对OB增殖、ALP活性和Ⅰ型胶原合成即有抑制作用，故在骨结核治疗中应该严格控制药物剂量．特别是在局部用药时。     

股密葆含药血清对高浓度地塞米松干预后成骨细胞增殖分化作用的影响

目的：观察股密葆含药血清对高浓度地塞米松干预后成骨细胞增殖分化的影响.方法：用多次酶消化法分离出生24 h内新生SD大鼠颅盖骨成骨细胞,P1代细胞进行实验.将不同浓度地塞米松（0、10-8、10-7、10-6、10-5、10-4 mol/L）干预成骨细胞,1周后进行碱性磷酸酶（alkaline phosphatase,ALP）染色,3周后进行矿化结节染色.根据上述实验结果,进一步选择10-5 mol/L地塞米松干预成骨细胞1周,继而改换空白鼠血清及高、中、低浓度股密葆含药血清培养基,培养1周后进行ALP染色,Western-blot检测Ⅰ型胶原及增殖细胞核抗原（proliferating cell nuclear antigen,PCNA）表达,培养2周后进行矿化结节染色.结果：生理浓度地塞米松（10-8 moL/L）可促进成骨细胞ALP的表达及矿化结节产生,而高浓度地塞米松（10-7～10-4 mol/L）可抑制上述结果,股密葆含药血清可逆转高浓度地塞米松对成骨细胞ALP、矿化结节、Ⅰ型胶原及PCNA的抑制作用.结论：高浓度地塞米松可抑制成骨细胞增殖分化,而这种抑制作用可被股密葆含药血清逆转.     

蛇床子素骨靶向药物对体外培养大鼠成骨 细胞增殖功能的影响

目的观察以壳聚糖衍生物（NSC)为载体,与蛇床子素（OST)共价结合后形成的具有亲骨性 和亲水性的新型化合物一蛇床子素骨靶向药物（NSC-OST)对体外培养大鼠成骨细胞（Osteoblast ,OB) 增殖功能的影响,探讨其防治骨质疏松的作用机制。方法取新生大鼠颅盖骨进行OB分离、培养, 采用碱性磷酸酶（ALP)染色及茜素红染色法鉴定OB;随机将OB分为5组,即空白对照组及终浓度 为 10—7mmol/L、10 ―6 mmol/L、10-5 mmol/L、10 ―4 mmol/L NSC-OST 实验组,分别加人不同浓度的 NSC-OST作用不同时间,用MTT法检测成骨细胞增殖情况。结果体外分离培养的细胞具有典型成 骨细胞形态学及生物学活性,碱性磷酸酶、茜素红染色均呈阳性结果;作用M h、48 h时,终浓度为 10—5 mmolL NSC-OST 可显著促进 OB 增殖（P <0. 05 ),作用 72 h,终浓度为 10-6mmol/L 和 10-5 mmolLNSC-OST可显著促进OB增殖（尸<0. 05 );终浓度为10—4mmol/L NSC-OST具有明显抑制OB 增殖的作用（P<0.01 )。结论 NSC-OST的水溶性良好,理化性质稳定,适当浓度的NSC-OST可促进 成骨细胞增殖,有望成为有效抗骨质疏松作用的新型药物。     

吡格列酮对大鼠骨髓间充质干细胞向成骨细胞分化的影响

目的体外观察葡萄糖与吡格列酮（PIO）对骨髓间充质干细胞（BMSCs）向成骨细胞（OB）分化的影响,探讨二者对骨代谢的作用机制。方法从大鼠长骨骨髓分离获取间充质干细胞,在不同糖浓度（5.6、25、50mmol.L-1）与PIO（0.1μg.mL-1）干预下向成骨细胞诱导分化培养21d;茜素红染色、光镜计数矿化率;realtime PCR测定OB的标记物碱性磷酸酶（ALP）,骨钙素（BGP）及转录因子Runx2 mRNA表达,进行不同糖浓度组间及PIO干预后的变化比较。结果随糖浓度升高,矿化率显著降低,与对照组（5.6mmol.L-1）相比,25mmol.L-1糖浓度组降低了21%,50mmol.L-1糖浓度组降低了55%,差异均有显著性（P〈0.01）;ALP、BGP、Runx2 mRNA表达也均降低,与对照组（5.6mmol.L-1）相比,25mmol.L-1组的ALP、BGP、Runx2 mRNA表达分别降低了21%、12%、15%,差异均有显著性（P〈0.05）;50mmol.L-1组的ALP、BGP及Runx2 mRNA表达下降也具有显著性（P〈0.05）。在3种糖浓度下,与相应组未加PIO相比,PIO干预组,矿化率明显降低,分别降低了20%、25%、25%,差异均有显著性（P〈0.05）;ALP,BGP及Runx2 mRNA表达水平也显著降低（P〈0.01）。结论高糖抑制BMSCs向OB分化,可能为糖尿病性骨质疏松形成的重要机制之一;在高糖条件下,PIO干预可加强抑制BMSCs向OB分化,这也可能是PIO致骨质疏松的重要机制。     

尼莫地平对体外培养成骨细胞的影响

目的 观察尼莫地平对体外培养成骨细胞的作用.方法 在新生SD大鼠头颅骨第2继代成骨细胞(OB2)培养液中分别加入不同浓度(10-1～10 9g/L)尼莫地平,分别观察OB2的增殖功能(用波长570nm处OD值表示),分化功能(用碱性磷酸酶ALP活性表示)和矿化功能(用矿化结节数量/视野表示).结果 增殖功能OD值为0.12±0.01～0.41±0.04;ALP活性为0.09±0.01U/mg蛋白质;矿化结节数量/视野为1.3±0.9个.结论 与对照组比较,尼莫地平各浓度对OB2的增殖、分化和矿化功能作用各异.当尼莫地平浓度为10 6g/L时,对OB2的增殖和分化功能具有刺激作用,对OB2的矿化功能具有显著的抑制作用;当浓度升高(10-2g/L)时,对OB2的增殖功能具有明显的抑制作用;当浓度降低(10 8g/L)时,对OB2的增殖功能失去作用.     

脱氢表雄酮对离体大鼠成骨细胞代谢和一些细胞因子的影响

目的 研究脱氢表雄酮(DHEA)促进成骨细胞(OB)增殖的作用和机制.方法 体外分离培养大鼠OB,取传一代细胞,分别给予10-5、10-7、10-9,mmol/L DHEA培养72 h,以10-8mmol/L雌二醇(estradiol,E2)为阳性对照,另设空白对照组.以细胞形态学和碱性磷酸酶(ALP)染色鉴定.应用光镜、四唑盐(MTT)法检测细胞的生长和增殖.茜素红染色观察成骨细胞矿化结节形成功能;同时双抗体夹心ABC-ELISA法测定不同浓度DHEA培养液中对VEGF、OPG、TGF-β、IL-1β和GM-CSF浓度的影响.结果 不同浓度DHEA组OB增殖能力均有上升,其中以10-7mmol/L DHEA组最显著(P＜0.01),其作用和E2相似(P＞0.05);不同浓度DHEA组ALP的活性均升高,亦以10-7 mmol/L DHEA组最显著(P＜0.01),10-7、10-9mmol/L DHEA的作用和E2和相似(P＞0.05);10-9mmol/L DHEA组单位细胞数的ALP活性高于空白对照组(P＜0.05).不同浓度DHEA组矿化面积及矿化面积比均有显著增加(P＜0.01),其作用和E2相似.在低浓度DHEA组的培养中对OPG、TGF-β1、VEGF的反应呈上升趋势与对照组有显著差别与0B增殖能力呈正相关;在高浓度DHEA组的培养中对IL-1β、GM-CSF的反应呈下降趋势与对照组有显著差别与OB增殖能力呈负相关.结论 DHEA能够促进大鼠OB生长和增殖,其作用可能与刺激OPG、TGF-β、VEGF;抑制IL-1β,GM-CSF途径有关.     

强骨宝方载药血清灭活与否对成骨细胞增殖功能的影响

目的：探讨强骨宝方糖尿病鼠血清灭活与否对成骨细胞增殖的影响。方法：采用胰蛋白酶-Ⅱ型胶原酶消化法从1-2日龄SD大鼠颅盖骨中分离出成骨细胞，倒置显微镜下观察其形态，碱性磷酸酶（ALPase）染色法、钙化结节染色、Van—Gieson染色鉴定细胞后用灭活和不灭活的不同时效（灌胃3、5d，末次灌胃l、3h）、不同浓度（5％、10％、20％）的强骨宝方糖尿病模型鼠血清加入成骨细胞培养体系，作用一定的时间，应用MTT比色法检测载药血清灭活对成骨细胞增殖能力的影响。结果：强骨宝方灌胃3、5d，末次灌胃l、3h的5％、10％、20％糖尿病鼠不灭活血清与灭活组相比差异有统计学意义，以不灭活载药血清对成骨细胞增殖功能的促进作用较强（P〈0．01或P〈0．05）。结论：强骨宝方糖尿病模型鼠血清灭活与否影响成骨细胞的增殖功能，以不灭活载药血清的作用最佳。     

脱氢表雄酮在体外对成骨细胞代谢和IL-1β的影响

目的探讨脱氢表雄酮（dehydroepiandrosterone,DHEA）对离体大鼠成骨细胞和IL-1β的影响。方法体外分离培养大鼠成骨细胞,取传一代细胞,分别给予10^-5mmoL／L、10^-7mmoL／L、10^-9mmol／LDHEA培养72h,以10^-8mmoL／L雌二醇（estradiol,E2）为阳性对照,另设空白对照组。碱性磷酸酶（alkaline phosphatase,ALP）染色鉴定成骨细胞,MTT法检测成骨细胞的增殖能力,PNPP法测定ALP活性。ELISA法测定不同浓度DHEA培养液中IL-1β的水平。结果不同浓度DHEA组成骨细胞增殖能力和ALP的活性均有上升,其中以10^-7mmoL／LDHEA组最显著（P〈0．01）,其作用和E2相似（P〉0．05）;10^-9mmoL／LDHEA组单位细胞数的ALP活性高于空白对照组（P〈0．05）。不同浓度的DHEA组IL-1β呈下降趋势,成骨细胞增殖能力及ALP活性和IL-1β成负相关。结论DHEA在体外促进大鼠成骨细胞生长和增殖,提高ALP活性,其作用可能和抑制IL-1β有关。     

异黄酮类药Genistein对原代培养大鼠成骨细胞增殖、分化、钙含量及矿化功能的影响

目的：了解异黄酮类药Genistein对体外培养成骨细胞的作用。方法：应用MTT法、对硝基苯磷酸盐法，原子吸收分光光度法及茜素红染色方法观察Genistein对体外培养成骨细胞的增殖、ALP表达，基质钙含量及矿化结节形成的影响。结果：Genistein具有刺激成骨细胞增殖，提高ALP活性，细胞基质钙含量及矿化结节形成的数量的作用。结论：Genistein具有刺激体外培养成骨细胞增殖，分化成熟及促进矿化的作用。     

丝裂原活化蛋白激酶对大鼠成骨细胞TRPV6表达的影响

目的探讨丝裂原活化蛋白激酶对大鼠成骨细胞瞬时性受体电位香草精受体6（transient receptor poten-tial vanilloid receptor 6,TRPV6）表达的影响。方法采用Wistar大鼠乳鼠,连续酶消化法提取成骨细胞并培养。根据组织形态学、改良Kaplow氏成骨细胞碱性磷酸酶染色、矿化结节茜素红染等方法进行鉴定。实验分组：a）正常对照组;b）PD组（PD98059 5μmol/L;PD98059 10μmol/L;PD98059 20μmol/L）;c）SB组（SB203580 5μmol/L;SB20358010μmol/L;SB203580 20μmol/L）;d）PD＋SB组（PD98059 5μmol/L＋SB203580 5μmol/L;PD98059 10μmol/L＋SB203580 10μmol/L;PD98059 20μmol/L＋SB203580 20μmol/L）。细胞计数法、MTT法检测细胞活性,RT-PCR检测成骨细胞TRPV6 mRNA。所得数据用x-±s表示,采用t检验进行统计学分析。结果随着PD98059和/或SB203580浓度的增加,细胞增殖活性有下降的趋势,二者联合作用时细胞活性低于二者单独作用。细胞计数法检测显示,PD98059与SB203580联合作用时,三种组合中细胞数均显著低于空白对照组,P〈0.01;同时也明显低于二者单独作用组细胞数量。碱性磷酸酶染色显示,联合用药组较单独用药细胞数明显减少,细胞体积变小,突起狭长,ALP染色阳性颗粒减少,随药物作用浓度增加上述变化更加显著。茜素红染色显示,钙结节与对照组比较数量少、体积小;10、20μmol/L联合作用组,细胞数减少更加明显,无钙结节形成。SB203580与PD98059二者联合应用显著抑制TR-PV6 mRNA的表达,5 mmol/L联合作用组即可明显抑制,随着作用浓度增加TRPV6 mRNA的表达量逐渐减少。结论 p44/42途径阻断剂PD98059能抑制成骨细胞增殖,明显降低成骨细胞TRPV6 mRNA表达,减少钙结节形成。p38途径阻断剂SB203580能抑制成骨细胞增殖,明显降低成骨细胞TRPV6 mRNA表达,减少钙结节形成。PD98059与SB203580在抑制成骨细胞增殖、降低成骨细胞TRPV6 mRNA表达、减少钙结节形成的作用方面存在协同作用。     

Genistein对乳腺癌细胞致成骨细胞生物学功能改变的影响

目的 探讨Genistein对乳腺癌细胞致成骨细胞(osteoblast, OB)增殖、分化和矿化功能的影响,观察Genistein在乳腺癌骨转移的病理条件下是否能调节OB生物学功能.方法 源于大鼠颅盖骨的原代OB与50%来自人源性乳腺癌细胞系MDA-MB-231或MCF-7的条件培养基(conditioned medium,CM)共同培养,并加入5×10-7 mol/L (G7)、5×10-8 mol/L (G8)或5×10-9mol/L (G9) 的Genistein进行干预.MTT法观察其对OB增殖的影响;PNPP偶氮法观察其对OB碱性磷酸酶(alkaline phosphatase, ALP)活性的影响;茜素红S(ARS)进行矿化结节染色并计算面积以观察其对OB矿化能力的影响.结果 MDA-MB-231和MCF-7细胞条件培养基可显著抑制OB的增殖.用Genistein干预1 d、3 d和5 d后,OB增值率可有不同程度的提高,差异有统计学意义(P<0.05).此外,乳腺癌细胞条件培养基可明显下调OB的ALP活性,而用不同浓度的Genistein干预后,OB的ALP活性分别较MDA-MB-231和MCF-7细胞条件培养基组增加22.7%、32.4%、63.5%和27.7%、32.0%、58.3%(P<0.05).Genistein还可改善乳腺癌细胞条件培养基对OB矿化能力的抑制,增加OB形成的矿化结节面积.结论 在乳腺癌骨转移的病理条件下,Genistein可促进OB的增殖、分化和矿化能力,改善乳腺癌细胞对OB生物学功能的抑制作用.     

降钙素基因相关肽对大鼠成骨细胞增殖和分化的影响

目的 探讨外源性降钙素基因相关肽（CGRP）对大鼠颅盖骨来源成骨细胞的影响，以进一步了解CGRP促进成骨的作用机制。方法 利用二次酶消化法培养的成骨细胞，加入含不同浓度CGRP的条件培养液，24小时后通过MTT比色，^3H-TdR掺入以及细胞内碱性磷酸酶（ALP）含量的测定来观察CGRP对成骨细胞增殖和分化的影响。结果 CGRP可以明显促进成骨细胞增殖，而且作用呈剂量依赖性。CGRP对细胞内ALP含量无明显影响。结论 CGRP能够直接作用于成骨细胞并通过促进其增殖而有利于骨形成。     

Effect of Benidipine Hydrochloride, a Dihydropyridine-type Calcium Antagonist, on the Function of Mouse Osteoblastic Cells

SUMMARY The effects of benidipine hydrochloride (BD), a dihydropyridine-type calcium antagonist, on the growth and alkaline phosphatase (ALPase) activity were studied in cultures of mouse osteoblastic cells. BD (0.1-10 nM) increased the ALPase activity of osteoblastic cells and reduced cell proliferation incubated for 48 h. This reduction of cell growth did not appear to be due to cell death. On the other hand, nifedipine and amlodipine (1 nM) had no effect. BD (0.1-10 nM) enhanced the effects of 1,25(OH)₂D₃ on osteoblastic cells, the decreased cell growth and increased ALPase activity. These findings suggest that BD regulates the growth and differentiation of osteoblasts and stimulates the function of these cells as well as 1,25(OH)₂D₃. Received: 12 August 1997/Accepted: 24 December 1997     

Oxygen tension is an important mediator of the transformation of osteoblasts to osteocytes

Osteocytes are derived from osteoblasts, but reside in the mineralized bone matrix under hypoxic conditions. Osteocyte-like cells show higher expression of ORP150, which is induced by hypoxia, than osteoblast-like cells. Accordingly, we hypothesized that the oxygen tension may regulate the transformation of osteoblasts to osteocytes. MC3T3-E1 cells and calvariae from 4-day-old mice were cultured under normoxic (20% O₂) or hypoxic (5% O₂) conditions. To investigate osteoblastic differentiation and tranformation to osteocytes, alizarin red staining was done and the expression of various factors was assessed. Hypoxic culture promoted the increased synthesis of mineralized matrix by MC3T3-E1 cells. Alkaline phosphatase activity was initially increased during hypoxic culture, but decreased during osteogenesis. Osteocalcin production was also increased by hypoxic culture, but decreased after mineralization. Furthermore, expression of Dmp1, Mepe, Fgf23, and Cx43, which are osteocyte-specific or osteocyte-predominant proteins, by MC3T3-E1 cells was greater under hypoxic than under normoxic conditions. In mouse calvarial cultures, the number of cells in the bone matrix and cells expressing Dmp1 and Mepe were increased by hypoxia. In MC3T3-E1 cell cultures, ORP150 expression was only detected in the mineralized nodules under normoxic conditions, while its expression was diffuse under hypoxic conditions, suggesting that the nodules were hypoxic zones even in normoxic cultures. These findings suggest that a low oxygen tension promotes osteoblastic differentiation and subsequent transformation to osteocytes.     

Long-term effects of neridronate on human osteoblastic cell cultures

Bisphosphonates (BPs) are widely used in the treatment of a variety of bone-related diseases, particularly where the bone turnover is skewed in favor of osteolysis. The mechanisms by which BPs reduce bone resorption directly acting on osteoclasts are now largely clarified even at molecular level. Researches concerning the BP's effects on osteoblast have instead shown variable results. Many in vitro studies have reported positive effects on osteoblasts proliferation and mineralization for several BPs; however, the observed effects differ, depending on the variety of different model system that has been used. OBJECTIVES: We have investigated if neridronate, an aminobisphosphonate suitable for pulsatory parenteral administration, could have an effect on human osteoblastic proliferation and differentiation in vitro. METHODS: We have investigated whether prolonged addition of neridronate (from 10(-3) to 10(-11) M) to different human osteoblasts cultures, obtained from 14 different bone specimens, could affect the cells number, the endogenous cellular alkaline phosphatase (ALKP) activity, and the formation of mineralized nodules. RESULTS: Our results show that neridronate does not negatively affect in vitro the viability, proliferation, and cellular activity of normal human osteoblasts even after a long period addition of the drug (20 days) at concentrations equal or lower than 10(-5) mol/l (therapeutic dose). In addition, neridronate seems to enhance the differentiation of cultured osteoblasts in mature bone-forming cells. A maximum increase of alkaline phosphatase activity (+50% after 10 days; P < 0.01) and mineralized nodules (+48% after 20 days; P < 0.05) was observed in cultures treated with neridronate 10(-8) M. CONCLUSIONS: These results encourage the use of neridronate in long-term therapy of demineralizing metabolic bone disorders.     

Stimulatory effects of phenytoin on osteoblastic differentiation of fetal rat calvaria cells in culture

Phenytoin (diphenylhydantoin, DPH), an anticonvulsant drug for epileptic patients, has several adverse effects, including calvarial thickening and coarsening of the facial features, which occur with chronic DPH therapy. While previous studies have demonstrated that DPH has an anabolic action on bone cells in vivo and in vitro, the basis of these effects is not fully understood. In this study, the effect of DPH on osteoblastic differentiation of fetal rat calvaria (RC) cells in culture was investigated by measuring bone nodule (BN) formation, cell growth, alkaline phosphatase (ALPase) activity, collagen synthesis, and expression of osteocalcin (OC) and osteopontin (OP) mRNAs. Continuous treatment of RC cells with DPH for 18 days dose-dependently increased the mineralized BN number by 1.2–1.7-fold at concentrations of 12.5–200 μmol/L DPH. Cell growth was not affected at the same concentrations of DPH. ALPase activity was stimulated by DPH (1.1–1.9-fold) dose-dependently and was maintained at higher levels in DPH-treated cells throughout the experimental period. DPH increased mineralized and unmineralized BN formations both in the presence and the absence of 10⁻⁸ mol/L dexamethasone (Dex). Expression of OC and OP mRNAs was markedly augmented by DPH on days 12–24 and on days 12–18, respectively. While control mRNA levels of OC and OP increased with time, the increases in DPH-treated cells were greater than those of the controls and the stimulatory effects were dose-dependent. Type I collagen was also influenced by DPH; mRNA level was enhanced and the percentage of collagen synthesized was increased significantly, by 200 μmol/L DPH. When DPH was added in three different culture stages, days 1–6 (growth), days 7–12 (matrix development), and days 13–18 (mineralization), BN formation was influenced primarily on days 1–6 and secondarily on days 7–12, but not on days 13–18, suggesting that DPH increased BN formation by enhancing not only the proportion of osteoprogenitor cells in the early stage but also the proportion of functional osteoblasts in the middle stage within mixed-cell populations. Moreover, such increases were detected in conditions of both Dex(+) and Dex(−). These findings demonstrate that DPH stimulates osteoblast-associated markers such as BNs, ALPase, OC, OP, and type I collagen by continuously affecting the stages of growth and matrix development in RC cells, and suggests that the stimulatory effects by DPH may possibly be induced independent of those by Dex.     

Elevated hepatocyte growth factor levels in osteoarthritis osteoblasts contribute to their altered response to bone morphogenetic protein-2 and reduced mineralization capacity

PurposeClinical and in vitro studies suggest that subchondral bone sclerosis due to abnormal osteoblasts is involved in the progression of osteoarthritis (OA). Human osteoblasts isolated from sclerotic subchondral OA bone tissue show an altered phenotype, a decreased canonical Wnt/ß-catenin pathway, and a reduced mineralization in vitro as well as in vivo. These alterations were linked with an abnormal response to BMP-2. OA osteoblasts release factors such as the hepatocyte growth factor (HGF) that contribute to cartilage loss whereas chondrocytes do not express HGF. HGF can stimulate BMP-2 expression in human osteoblasts, however, the role of HGF and its effect in OA osteoblasts remains unknown. Here we investigated whether elevated endogenous HGF levels in OA osteoblasts are responsible for their altered response to BMP-2.MethodsWe prepared primary human subchondral osteoblasts using the sclerotic medial portion of the tibial plateaus of OA patients undergoing total knee arthroplasty, or from tibial plateaus of normal individuals obtained at autopsy. The expression of HGF was evaluated by qRT-PCR and the protein production by western blot analysis. HGF expression was reduced with siRNA technique whereas its activity was inhibited using the selective inhibitor PHA665752. Alkaline phosphatase activity (ALPase) and osteocalcin release were measured by substrate hydrolysis and EIA respectively. Canonical Wnt/β-catenin signaling (cWnt) was evaluated both by target gene expression using the TOPflash TCF/lef luciferase reporter assay and western blot analysis of β-catenin levels in response to Wnt3a stimulation. Mineralization in response to BMP-2 was evaluated by alizarin red staining.ResultsThe expression of HGF was increased in OA osteoblasts compared to normal osteoblasts and was maintained during their in vitro differentiation. OA osteoblasts released more HGF than normal osteoblasts as assessed by western blot analysis. HGF stimulated the expression of TGF-β1. BMP-2 dose-dependently (1 to 100 ng/ml) stimulated both ALPase and osteocalcin in normal osteoblasts whereas, it inhibited them in OA osteoblasts. HGF–siRNA treatments reversed this response in OA osteoblasts and restored the BMP-2 response. cWnt is reduced in OA osteoblasts compared to normal, and HGF–siRNA treatments increased cWnt in OA osteoblasts almost to normal. Smad1/5/8 phosphorylation in response to BMP-2, which is reduced in OA osteoblasts, was corrected when these cells were treated with PHA665752. The BMP-2-dependent mineralization of OA osteoblasts, which is also reduced compared to normal, was only partially restored by PHA665752 treatment whereas 28 days treatment with HGF reduced the mineralization of normal osteoblasts.ConclusionOA osteoblasts expressed more HGF than normal osteoblasts. Increased endogenous HGF production in OA osteoblasts stimulated the expression of TGF-β1 and reduced their response to BMP-2. Inhibiting HGF expression or HGF signaling restored the response to BMP-2 and Smad1/5/8 signaling. In addition, decreased HGF signaling partly corrects the abnormal mineralization of OA osteoblasts while increased HGF prevents the normal mineralization of normal osteoblasts. In summary, we hypothesize that sustained elevated HGF levels in OA osteoblasts drive their abnormal phenotype and is implicated in OA pathophysiology.     

云克对骨质疏松症患者成骨功能影响的研究

目的 观察云克对骨质疏松症患者成骨功能的影响.方法 取骨质疏松症患者骨组织,酶消化法培养成骨细胞,给予不同浓度云克予以干预,CCK-8法检测细胞增殖功能、流式细胞仪检测细胞周期、对硝基苯磷酸盐法检测碱性磷酸酶(ALP)活性、茜素红染色计数矿化结节的变化、Real-time RT-PCR检测骨钙素和骨形成蛋白(BMP)-...