静磁场促进成骨作用机制的研究进展

相关研究表明,静磁场可以促进细胞成骨作用,并已经广泛应用于临床治疗,但关于其具体机制,至今仍然没有定论。大量学者通过实验试图明确这一机制。本文就此方面的研究进展进行系统阐述。     

纯钛表面微弧氧化结合Ⅰ型胶原对成骨细胞黏附增殖的影响

目的 探讨微弧氧化(microarc oxidation,MAO)结合应用于纯钛种植体表面处理的可行性.方法 根据对纯钛钛片处理的不同将实验分为对照组(A组,不作处理)、MAO组(B组,纯钛片上进行MAO处理)及MAO加Ⅰ型胶原组(C组,纯钛片上MAO处理后吸附Ⅰ型胶原).将成骨细胞培养于各组钛片上,通过扫描电镜、MT...     

Calcium Mobilization is Required for Spreading in Human Osteoblasts

Adhesion-induced changes in intracellular calcium concentration ([Ca²⁺]_i) were measured in populations of human osteoblasts spreading on bone matrix proteins. In cells spreading on collagen type I, fibronectin, or laminin, average values for [Ca²⁺]_i were found to increase approximately 2× over baseline and then decline. The speed with which [Ca²⁺]_i increased and declined was dependent upon the matrix protein on which the cells were plated but was generally complete within 1 hour from the time of plating. Calcium mobilization was found to be due to influx of calcium across the osteoblast plasma membrane and was integrin dependent. Carboxyamido triazole (CAI), a specific inhibitor of nonvoltage-dependent calcium channels, or BAPTA-AM, a chelator of intracellular calcium, inhibited osteoblast adhesion and spreading on collagen type I, fibronectin and laminin in a dose-dependent manner. In conclusion, these results demonstrate that calcium mobilization is induced upon integrin-ligand contact and that calcium influx is required for cell adhesion and spreading. Received: 10 September 1999 / Accepted: 18 January 2000     

负载BMP-2掺锶磷酸钙复合材料对成骨细胞增殖及功能的影响

目的探索负载BMP-2掺锶磷酸钙复合材料对成骨细胞增殖及功能的影响。方法获取SD大鼠成骨细胞,随机分为空白对照组(Con组)、磷酸钙组(CPC组)和复合材料组(BSCPC组);培养基中分别添加安慰剂、磷酸钙和负载BMP-2掺锶磷酸钙共培养一段时间,通过CCK-8法检测成骨细胞的增殖情况,碱性磷酸酶(alkalinephosphatase,ALP)及茜素红染色观察细胞的功能状态,蛋白电泳观察骨保护素(osteoprotegerin,OPG)、核因子κB受体活化因子(receptor activator of nuclear factor-KB,RANK)及核因子κB受体活化因子配体(ligand of receptor activator of nuclear factor-κB,RANKL)蛋白的表达情况。结果共培养1、3、5和7 d,和Con组比较,CPC组和BSCPC组的成骨细胞数目明显增加(P0.05),且以BSCPC组成骨细胞数目最多(P0.05);共培养14 d及21 d,和Con组比较,CPC组和BSCPC组的成骨细胞的矿化能力及ALP活性明显增加(P0.05),且以BSCPC组细胞钙化能力最强及ALP活性最高(P0.05);共培养7 d,和Con组比较,CPC组和BSCPC组的成骨细胞的OPG表达明显增加,而RANK及RANKL蛋白表达明显降低(P0.05),且以BSCPC组的成骨细胞蛋白OPG、RANK及RANKL蛋白表达量改善最为显著(P0.05)。结论负载BMP-2掺锶磷酸钙复合材料促进成骨细胞增殖分化和改善细胞活性和功能。     

Rodent Osteoblastic Cells Express Voltage-Sensitive Calcium Channels Lacking a γ Subunit

Voltage-sensitive calcium channels (VSCC) open in response to external stimuli, including calcitropic hormones, that alter plasma membrane calcium (Ca²⁺) permeability. Ca²⁺ that enters the cell through these channels serves a second messenger function, eliciting cellular responses that include secretion and changes in gene expression. In osteoblasts, VSCCs serve as key regulators of Ca²⁺ permeability and are a major class of calcitropic hormone-sensitive Ca²⁺ channels present in the plasma membrane. The members of the VSCC family exist as a complex of polypeptide subunits that are comprised of a pore-forming ₁ subunit, an intracellular subunit, a dimer of disulfide-linked ₂ and subunits, and in some tissues, a subunit. Previous studies in our laboratory have shown that the major functional ₁ subunit present in osteoblasts is the _1C (Ca_V1.2). To determine the complement of auxiliary subunits present in rodent osteoblastic cells, we employed RT-PCR using a battery of subunit specific primers and appropriate tissue controls. Immunohistochemistry also was performed, using available subunit specific antibodies, to measure protein expression and localization. Cell types examined included MC3T3-E1 at various stages of differentiation, ROS 17/2.8 osteosarcoma, and primary cultures of rat calvarial osteoblasts. The results indicate that all cells expressed multiple subunit classes and ₂ dimers, but no subunits, regardless of differentiation state. We propose a structure for the functional osteoblast VSCC that consists of ₁, , ₂ subunits and is devoid of a subunit.     

骨康含药血清对成骨细胞PDGF-AA表达影响的实验研究

目的 观察中药骨康含药血清对新生大鼠成骨细胞血小板衍生生长因子-AA（PDGF—AA）基因表达的调控作用。方法 将实验动物随机分成中药组、罗盖全组和蒸馏水组3组，通过体外分离和培养成骨细胞体系，运用逆转录法测定含药血清对成骨细胞PDGF-AA mRNA表达的影响。结果 用10％的血清培养成骨细胞第7d时，与空白血清组相比，骨康含药血清组和罗盖全含药血清组对成骨细胞PDGF—AA mRNA表达的平均影响率分别为149．4％和177．7％。结论 中药骨康含药血清能明显增强成骨细胞PDGF—AA mRNA的表达。     

脉冲电磁场促进人骨髓间充质干细胞成骨的研究

目的 :观察脉冲电磁场 (PEMFs)对人骨髓间充质干细胞 (hMSCs)成骨能力的影响。方法 :hMSCs受频率 12Hz、场强 1.1mT的PEMFs刺激 8h/d ,检测细胞增殖、细胞周期 ,观察细胞超微结构、骨钙素、Ⅰ型胶原免疫组化染色 ,碱性磷酸酶 (ALP)活性、核固红钙染色。结果 :脉冲电磁场作用后的细胞增殖能力提高 ,细胞形态发生变化 ,透射电镜观察提示细胞成熟 ,核固红钙染色、骨钙素、Ⅰ型胶原免疫组化染色均阳性 ,ALP活性增高。结论 :hMSCs经合理的PEMFs体外刺激后 ,细胞增殖加速 ,符合成骨细胞的形态特征和生物学特性。     

阿仑磷酸钠和辛伐他汀对体外培养成骨细胞的影响

目的探讨辛伐他汀和阿仑磷酸钠对体外培养成骨细胞的影响。方法分离3周龄成骨细胞，体外培养时以辛伐他汀和阿仑磷酸钠刺激，观察成骨细胞碱性磷酸酶水平和成骨细胞增殖率。结果辛伐他汀、阿仑磷酸钠可以促进成骨细胞增殖，增加碱性磷酸酶的分泌，二者共同作用后作用更显著。结论辛伐他汀和阿仑磷酸钠能促进成骨细胞增殖和分泌碱性磷酸酶，可以联合作用促进骨形成。     

氟化钠对乳鼠成骨细胞c—fos,c—jun基因表达及细胞增殖？…

目的 探讨氟对钠（ＮａＦ）对离体成骨细胞ｃ－Ｆｏｓ、ｃ－Ｊｕｎ基因表达的调控及细胞增殖的影响。方法 采用新生大鼠头盖骨分离成骨细胞,在不同浓度ＮａＦ（１０＾－５ｍｏｌ／Ｌ、１０＾－４ｍｏｌ／Ｌ、１０＾－３ｍｏｌ／Ｌ）中进行培养,用四甲基偶氮唑蓝比色法检测细胞增殖,用免疫组化ＳＰ法结合计算机图像处理系统检测ＮａＦ诱导的ｃ－Ｆｏｓ、ｃ－Ｊｕｎ表达。结果 实验表明ＮａＦ可刺激成骨细胞增殖,并诱导成骨细胞