人骨肉瘤组织中survivin的表达

目的:研究survivin在骨肉瘤中的表达及其临床意义。方法:对74例骨肉瘤患者的临床病理资料进行回顾性分析。应用survivin抗体对上述患者的肿瘤组织切片进行免疫组织化学染色并进行统计学分析。结果:74例标本中58例为阳性,总阳性率为78.4%。survivin的表达与患者年龄、性别、骨肉瘤亚型无明显关系。但与Enneking外科分期有关,Ⅰ~ⅡA与ⅡB~Ⅲ之间,肿瘤survivin表达率差异明显(P<0.05)。结论:survivin在骨肉瘤组织中有较高比例的表达,并与肿瘤的外科分期密切相关。     

Diagnosis of small round cell tumours of bone

Diagnosis of small round cell tumours of bone remains a diagnostic challenge. The first part of this review is a summary of the diagnostic criteria for Ewing tumours, small cell osteosarcoma, mesenchymal chondrosarcoma, primary bone lymphoma, and metastatic tumours. Immunohistochemical and molecular aspects of diagnosis, when available, are stressed, especially in the case of Ewing tumour. The second part discusses the utility of several procedures in the diagnosis of small round cell tumours including fine needle aspiration biopsies, a panel of immunohistochemistry, pitfalls in molecular diagnosis, and other techniques potentially useful in the near future.     

Rapid progression of metastatic osteosarcoma after initiation of a reduced-intensity conditioning regimen with immunosuppressive fludarabine

Indications for RIST have not been established in patients with solid tumors. In this study, we performed RIST as immunotherapy in a 13-yr-old girl with intractable but not progressive osteosarcoma, which originated from the inter-costal region. Carcinomatous pleurisy suddenly developed after the start of a conditioning regimen that included Flu and BUS. She died of respiratory failure on day +19 without signs of engraftment. This case suggests that unexpected acceleration of tumor growth may occur following RIST with immunosuppressive drugs before the development of a beneficial GVT effect.     

顺铂-自制珊瑚人工骨缓释体系的制备及体外实验

目的 研制顺铂珊瑚羟基磷灰石缓释体,并分析其体外药物缓释对人U-2 OS骨肉瘤细胞、骨转移乳腺癌细胞及骨转移前列腺癌细胞的抑制能力.方法 通过水热反应合成珊瑚羟基磷灰石人工骨,再通过真空冷冻干燥等处理将顺铂载入形成复合抗肿瘤人工骨缓释体,将复合人工骨浸入模拟体液取得不同时间浸提液.采用四甲基偶氮唑蓝法检测其体外抑瘤作用.结果 顺铂分布均匀于复合人工骨孔隙内,除8周浸提液对前列腺癌细胞的抑制率为29.92%外,其余浸提液在体外对肿瘤细胞的抑制率均大于50%.结论 该缓释体具有良好的缓释功能,在8周内对骨肿瘤细胞有良好的抑制杀伤作用.     

二膦酸盐对MG-63细胞增殖及凋亡的影响

目的体外观察二膦酸盐对骨肉瘤MG-63细胞的抑制增殖和促进凋亡作用。方法将不同浓度的二膦酸盐药物与MG-63细胞体外培养,采用MTT比色法测定其细胞活力,绘制细胞生长曲线;Hoechst33258细胞染色法观察细胞凋亡形态;流式细胞仪进行细胞周期分析及凋亡检测。结果MTT比色法测得药物作用72h对MG-63细胞的ID50为52.37μmol/L;细胞生长曲线表明细胞增殖数量与药物浓度及时间有显著依赖性;细胞荧光染色观察实验组细胞形态改变;细胞流式观察细胞凋亡实验组较正常差异有显著性,72h后细胞凋亡率40.2%±2.1%相比正常细胞2.8%±0.7%有统计学意义;细胞周期分析实验组细胞SubG1相比正常组显著累积G2/M细胞被阻滞。结论二膦酸盐抑制体外培养骨肉瘤MG-63细胞增殖,并可诱导其细胞凋亡。     

Effect of protriptyline on [Ca2+]i and viability in MG63 human osteosarcoma cells

Tricyclic antidepressants (TCA) have been clinically prescribed in the auxiliary treatment of cancer patients. Although protriptyline, a type of TCA, was used primarily in the clinical treatment of mood disorders in cancer patients, the effect of protriptyline on physiology in human osteosarcoma is unknown. This study examined the effect of protriptyline on cytosolic free Ca^2+?concentrations ([Ca²⁺]_i) and viability in MG63 human osteosarcoma cells. Protriptyline between 50 and 250?μM evoked [Ca²⁺]_i rises concentration-dependently. Protriptyline induced influx of Mn²⁺, indirectly implicating Ca^2+?influx. Protriptyline-evoked Ca^2+?entry was inhibited by nifedipine by 20% but was not altered by econazole, SKF96365, GF109203X, and phorbol-12-myristate-13-acetate (PMA). In Ca²⁺-free medium, treatment with protriptyline inhibited the endoplasmic reticulum Ca^2+?pump inhibitor thapsigargin-evoked [Ca²⁺]_i rises. Conversely, treatment with thapsigargin inhibited 45% of protriptyline-evoked [Ca²⁺]_i rises. Inhibition of phospholipase C (PLC) with U73122 failed to alter protriptyline-evoked [Ca²⁺]_i rises. Protriptyline at 50–250?μM decreased cell viability, which was not reversed by pretreatment with the Ca^2+?chelator 1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid-acetoxymethyl ester (BAPTA/AM). Collectively, our data suggest that in MG63 cells, protriptyline induced [Ca²⁺]_i rises by evoking Ca^2+?release from the endoplasmic reticulum and other stores in a PLC-independent manner, and Ca^2+?entry via a nifedipine-sensitive Ca^2+?pathway. Protriptyline also caused Ca²⁺-independent cell death.     

Electron Microscopy in the Diagnosis of Small Round Cell Tumors of Bone

Small round cell tumors involving bone can present problems in differential diagnosis by light microscopy. In exploring the role of electron microscopy in this situation, seven small cell osteosarcomas and seven mesenchymal chondrosarcomas were examined by electron microscopy and compared with typical and atypical Ewing's sarcomas. There is much overlap in the ultrastructural features of these tumors, but electron microscopy is helpful to establish or confirm a diagnosis of typical Ewing's sarcoma and, if representative matrix is present, of small cell osteosarcoma.