Vascular Channel Formation by Osteosarcoma Cells in Vitro: Vasculogenic Mimicry

Objective: To observe whether there is evidence for vascular channel formation by osteosarcoma cellsin vitro and to illustrate mechanism of vasculogenic mimicry in osteosarcoma.Methods: Osteosarcoma cell lines (U-2OS) were tested for their ability to form tubular networks in three-dimensional culture containing type I collagen. The structures of the tubular networks were observed under a phase contrast microscope and an electron microscope.Results: Observation under light microscopy and electron microscopy showed that high aggressive osteosarcoma cells line (U-2OS) formed networks containing channels when grown in three-dimensional culture containing type I collagen in the absence of endothelial cells or fibroblasts.Conclusion: These observations strongly suggest that aggressive osteosarcoma cells may generate vascular channels that facilitate tumor perfusion independent of tumor angiogenesis and have the ability of vasculogenic mimicry. Key words osteosarcoma cells line - vasculogenesis mimicry - angiogenesis - 3-dimensional cultures This study was supported in part by the National Natural Sciences Foundation of China (No. 30271314).

Extraction, Purification and Identification of Bone Morphogenetic Protein in Conditioned Medium of Osteosarcoma Cell (MG-63)

Objective: To find out a method of extraction and purification of bone morphogenetic protein (BMP) from osteosarcoma cell conditioned medium, and evaluate the biological activity of BMP.Methods: Conditioned medium of osteosarcoma cell lines (MG-63) was collected, concentrated and dialyzed. The concentrated protein was purified through gel chromatography on Sephcryl-S-100. The purified protein was tested by BMP monoclonal antibody (McAb), its molecular weight (MW) was determined by SDS-PAGE and its biological activity was demonstrated by heterotopic ossification.Results: The purified protein was proved to be BMP by BMP McAb, had a satisfactory heterotopic ossification, and its MW was about 21 kD.Conclusion: BMP existed in the conditioned medium of osteosarcoma cell and had a satisfactory biological activity after purification. Because osteosarcoma cell can be cultured and grew for a long timein vitro, this method will be helpful to a vast extraction of BMP and clinical application. Key words osteosarcoma cell - conditioned medium - bone morphogenetic protein - protein purification This project was a key scientific and technological program of Hubei Provicial Scientific and Technological Committee (No. 002p1503).

The expression of TRAIL and its receptors in osteosarcoma cells and the apoptosis effect of a combination of TRAIL, adriamycin and IFN-γ on MG-63 cells

Objective： This study investigated the effects of rh-TRAIL with or without chemotherapeutic drugs on the apoptosis of the osteosarcoma cell line, MG-63, and the influence of chemotherapeutic drugs on changes in the expression of DR5 and YinYang 1 （YY1） in MG- 63 cells. Methods： The effects of treatment with rh-TRAIL alone and/or chemotherapetic drugs on MG-63 cell growth inhibition and apoptosis were measured using the MTT assay, FACS analysis ofAunexin V labeled cells, and the mRNA changes of DR5 and YY1 were detected by RT-PCR. Results： Rh-TRAIL protein inhibited the growth of MG-63 cells, and this inhibition was increased by adriamycin and IFN-γ. Adriamycin and IFN-γ significantly facilitated the induction of the expression of DR5 and reduced the expression of YY1. Conclusion： The apoptosis-inducing effect of rh-TRAIL in MG-63 cells was enhanced by chemotherapeutic drugs.

Human Soluble TRAIL Protein Inducing Apoptosis in Osteosarcoma Cell

This study is to examine the effect of human recombinant soluble TRAIL （TNF-related apoptosis-inducing ligand） protein inducing apoptosis in MG-63 human osteosarcoma cells. The inhibitive rates of TRAIL to MG-63 cells were detected by MTT assay. The apoptosis induced by TRAIL in MG-63 human osteosarcoma cells was analyzed with FACS and TUNEL and the apoptotic bodies were observed by transmission electron microscope. MTT assay showed that the inhibitive rates of 500, 1 000, 2 000 and 4 000 ng/mL TRAIL for 24 h were 10.1%, 24.3%, 50.6% and 97.7% respectively. Flow cytometric analysis showed that after MG-63 cells were treated with 2 gg/mL TRAIL for 6 h, obvious apoptotic peak would immediately appear before diploid peak. Human soluble TRAIL protein can quickly kill MG-63 osteosarcoma cells selectively, and may have potential value for clinical treatment of osteosarcoma.

The experiment study on LMWH inhibiting the expression of Livin and inducing the apoptosis of osteosarcoma cells

Objective: To investigate the inhibitory effects of LMWH suppressing the expression of Livin and inducing the apoptosis of the osteosarcoma cells. Methods: Osteosarcoma cells line MG-63 was cultured in vitro. MTT assay and flow cytometry were used to study the effect of LMWH with different concentration suppressed the prolifetation and induced apop- tosis in osteosarcoma cells line MG-63. The expression of Livin of osteosarcoma cells line MG-63 was analysed by the im- munohistochemistrical method and PT-PCR. Results: Low molecular weight heparin could inhibit the growth of osteosarcoma cell line MG-63. With the LMWH's increasing, the apoptosis rate was increased significantly. Immunohistochemistrical method and PT-PCR showed that the expression of Livin of osteosarcoma cells line MG-63 declined obviously than that before medi- cation. Conclusion: LMWH has very strong anti-tumor effect in vitro. The possible mechanisms of LMWH anti-tumor effect are associate with the effect of suppressing the expression of Livin and inducing cell apoptosis.

Biological behaviors of two novel syngeneic human osteosarcoma cell lines

Objective To characterize and compare the different biological behaviors of two novel human osteosarcoma cell lines,Zos and Zos-M,established respectively from the primary site and the skip metastasis of an osteosarcoma patient.Methods Two

Prednisolone inhibits SaOS2 osteosarcoma cell proliferation by activating inducible nitric oxide synthase

AIM:To investigate the effect of prednisolone,a synthetic glucocorticoid used in inflammatory diseases,on the growth of cultured osteosarcoma cells.METHODS:Two osteosarcoma cell lines with different degree of differentiation were used.SaOS2 show a rather mature phenotype,while U2 OS are negative for almost all osteoblastic markers.The cells were exposed to different concentrations of prednisolone(1-9 μmol/L) with or without antioxidants or the inhibitor of inducible nitric oxide synthase(i NOS) l-N6-(iminoethyl)-lysine-HCl(L-NIL).Cell growth was assessed by counting viable cells.The production of nitric oxide(NO) was measured in the conditioned media by the Griess method.The production of reactive oxygen species was quantified using 2'-7'-dichlorofluorescein diacetate.Western blot with specific antibodies against NOSs was performed on cell extracts.RESULTS:Prednisolone inhibited SaOS2 cell growth in a dose dependent manner.No significant effects were observed in U2OS.The inhibition of SaOS2 growth is not due to oxidative stress,because antioxidants do not rescue cell proliferation.Since high concentrations of NO inhibit bone formation,we also measured NO and found it induced in SaOS2,but not in U2 OS,exposed to prednisolone,because of the upregulation of i NOS as detected by western blot.Therefore,we treated SaOS2 with prednisolone in the presence or in the absence of L-NIL.L-NIL prevented NO release induced by prednisolone at all the concentrations apart from 9 μmol/L.At the same concentrations,we found that L-NIL rescued SaOS2 growth after exposure to prednisolone.In U2 OS cells,prednisolone did not induce NO production nor affected cell growth.All together,these data indicate that a link exists between increased amounts of NO and growth inhibition in response to prednisolone in SaOS2.CONCLUSION:Prednisolone inhibited SaOS2 proliferation by increasing the release of NO through the upregulation of i NOS,while no effect was exerted on U2OS.

Forskolin augments the effects of glucocorticoids on proliferation and differentiation of a human osteosarcoma cell line by up-regulation of glucocorticoid receptor

The effect of forskolin, an activator of adenylate cyclase, on glucocorticoid-induced modulation of proliferation and differentiation of a human osteosarcoma cell line(HOS-8603) was iniually studied. It was found that forskolin could significantly augment

Effect of NS398 on inducing apoptosis and down-regulating Bcl-2 protein in human osteosarcoma cell MG-63 line

Objective： This study investigated the effect of NS398 on anti-proliferation and the mechanism of inducing apoptosis of human osteosarcoma cell MG-63 line in vitro. Methods： Growth suppression was detected by MTT method. Special morphological changes of apoptosis were observed by transmission electron microscopy （TEM） and DNA fragments electrophoresis. The apoptotic rates were quantified by flow cytometry （FCM）. And Bcl-2 protein level were detected by Western Blotting assay. Results： Different concentration NS398 inhibited the cell growth. Through TEM and DNA electrophoresis, the special morphological changes were observed after 24, 48 and 72 h treatment with NS398. The apoptotic rates of MG-63 cells treated with NS398 were respectively, significantly higher than that of the control group（ P 〈0.01 ）. Western blot assay showed that NS398 reduced Bcl-2 protein expression. Conclusion： NS398 suppressed the proliferation of human osteosarcoma cell MG-63 line and induced apoptosis. The mechanism may be associated with down-regulation expression level of bcl-2 protein.

Base Excision Repair Inhibition by Methoxyamine Impairs Growth and Sensitizes Osteosarcoma Cells to Conventional Treatments

The outcome of patients with osteosarcoma has not significantly improved in the last three decades. Therefore, there is still a need for the development of more effective therapeutic strategies. Methoxyamine (MX) is a base excision repair (BER) inhibitor that has shown anticancer potential by sensitizing a variety of tumor cells to ionizing radiation and chemotherapeutic drugs. In the present study, the in vitro antiproliferative effects of MX were evaluated in two osteosarcoma cell lines, HOS and MG-63. Evaluation of the influence on radiosensitivity and drug interactions in simultaneous treatments with methotrexate, doxorubicin, and cisplatin was also performed. Exposure to MX significantly decreased cell proliferation and mediated a substantial increase of apoptosis. Moreover, our results showed that MX synergized with ionizing radiation in both cell lines while potentiated the antitumor effects of cisplatin and methotrexate. Altogether, the results presented herein demonstrate the feasibility of inhibiting the BER pathway, which may in future be a promising strategy for overcoming intrinsic tumor resistance and to improve the outcome of patients with osteosarcoma.

Fluorescence microscopic morphology and inhibition ratestudies on apoptosis of osteosarcoma cells induced by ^(153)Sm

The apoptosis of osteosarcoma cells treated with irradiation by 153Sm-EDTMP was studied. The morphological changes in osteosarcoma cells were observed by fluorescence microscopy. It was found that osteosarcoma cells exposed with 153Sm-EDTMP displayed significant nuclear fragmentation and marked pyknosis. With the prolongation of observing period, the membrane bound apoptotic bodies formation was observed. It should be noted, that with the lengthening of irradiation time by 153Sm-EDTMP, the inhibition rate of proliferation of osteosarcoma cells increased progressively.

Reversion effects of curcumin on multidrug resistance of MNNG/HOS human osteosarcoma cells in vitro and in vivo through regulation of P-glycoprotein

Background P-glycoprotein （P-gp） encoded by ATP-binding cassette sub-family B member 1 （ABCB1） gene is a kind of ATP-dependent drug transporter, which plays important roles in multidrug resistance （MDR） of human cancers, such as osteosarcoma. Curcumin is a natural phenolic coloring compound originating from the rhizomes of Curcuma Ionga, which is proved to possess antitumor biological activities including reversion of MDR. However, the effect and molecular mechanisms of curcumin to osteosarcoma MDR remain unclear.

Relationship between the induction of heat shock proteins and the decrease in glucocorticoid receptor during heat shock response in human osteosarcoma cells

Previously,it has been found that glucocorticoid receptor(GR)binding activity decreasedrapidly during heat shock response in HOS-8603,a human osteosarcorna cell line.In this study,Therelationship between the induction of heat shock proteins(HSPs)and the decrease in GR was furtherstudied in the same cell line.It was found that even though quercetin could specifically inhibit the ex-pression of hsp90α and hsp70 mRNA,it could not prevent GR from the decrease in response to the heatshock treatment.This represents the first reported evidence that the induction of HSPs and the decrease inGR during heat shock response were 2 independent biological events.The results of the present study furthershowed that although the heat shock treatment alone had no effects on alkaline phosphatase(AKP)activity,itcould completely block the induction of AKP activity in HOS-8603 cells by dexamethasone(Dex),a syntheticglucocorticoid.These results demonstrate that the heat shock-induced alteration in GR was accompanied by adecrease in GR functional activity.Furthermore,when the induction of HSPs was inhibited by the treatmentof cells with quercetin,the stimulatory effects of Dex on AKP activity could still be inhibited completely bythe heat shock treatment.The results of this part,on the basis of GR functional activity,further demonstratethat quercetin could not inhibit the heat shock-induced decrease in GR,even though it could inhibit the induc-tion of HSPs.To clarify further the effects of quercetin alone on GR binding activity in HOS-8603 cells,theregulation of GR by quercetin was also studied.It was found for the first time that quercetin coulddown-regulate GR in a time-dependent manner significantly,and that the down-regulation of GR by quercetinin HOS-8603 cells paralelled with a decrease in glucocorticoid-mediated functional responses,suggesting thatthe down-regulation of GR by quercetin is of biological significance.

Enrichment of osteosarcoma stem cells by chemotherapy

Osteosarcoma is the most common primary malignant bone cancer in children and adolescents.Emerging evidence has suggested that the capability of a tumor to grow is driven by a small subset of cells within a tumor,termed cancer stem cells(CSCs).Although several methods have been explored to identify or enrich CSCs in osteosarcoma,these methods sometimes seem impractical,and chemotherapy enrichment for CSCs in osteosarcoma is rarely investigated.In the present study,we found that short exposure to chemotherapy could change the morphology of osteosarcoma cells and increase sarcosphere formation in vitro,as well as increase tumor formation in vivo.Furthermore,methotrexate(MTX)-resistant U2OS/MTX300 osteosarcoma cells were larger in size and grew much more tightly than parental U2OS cells.More importantly,U2OS/MTX300 cells possessed a higher potential to generate sarcospheres in serum-free conditions compared to parental U2OS cells.Also,U2OS/MTX300 cells exhibited the side population(SP)phenotype and expressed CSC surface markers CD117 and Stro-1.Notably,U2OS/MTX300 cells showed a substantially higher tumorigenicity in nude mice relative to U2OS cells.Therefore,we conclude that chemotherapy enrichment is a feasible and practical way to enrich osteosarcoma stem cells.

Tumorigenesis and spontaneous metastasis by luciferase-labeled human xenograft osteosarcoma cells in nude mice

Background Osteosarcoma （OS） is the most common primary malignant tumor of bone. Mouse models of human OS can invariably provide greater insight into the complex mechanisms that underlie the development and pathogenesis of this aggressive tumor. Bioluminescence technology favored tracing cancer cells in vivo. In this study, an OS model was described and evaluated using human OS cell line, Saos2, labeled with luciferase （Saos2-1uc）. Methods Saos2 cells were infected by lentivirus loading a firefly luciferase gene. Luciferase expression of Saos2-1uc cells was characterized both in vitro and in vivo. Specific biologic and oncologic features of Saos2-1uc cells were analyzed. The OS was established as orthotopic xenografts in nude mice. Both orthotopic tumors and spontaneous lung metastasis were analyzed. Results Tumorigenesis and spontaneous lung metastasis in nude mice could be monitored in vivo through in vivo imaging system. The enhancement in proliferation, migration and invasion abilities and the attenuation in adhesion ability were observed in Saos2-1uc cells compared with Saos2 cells. Furthermore, there were the up-regulation of Osteocalcin, CCRIO, CXCR1 and ID1 and the down-regulation of ALP, collagen I, CCR1, CCR3, CXCR3, NID and N-cadherin in Saos2-1uc cells compare to Saos2 cells. The rate of spontaneous lung metastasis in Saos2-1uc cells was higher than that in Saos2 cells, although without significant difference. Conclusions Lentivirus transfection may cause alteration of gene expression profiles and further biological functions. This model can be used in the elucidation of molecular mechanisms of tumorigenesis and the screening of new therapeutic agents.

Differentiation of human osteosarcoma 3AB-OS stem-like cells in derivatives of the three primary germ layers as a useful <i>in vitro</i>model to develop several purposes

A number of solid tumors contain a distinct subpopulation of cells, termed cancer stem cells (CSCs) which represent the source for tissue renewal and hold malignant potential and which would be responsible for therapy resistance. Today, the winning goal in cancer research would be to find drugs to kill both cancer cells and cancer stem cells, while sparing normal cells. Osteosarcoma is an aggressive pediatric tumor of growing bones that, despite surgery and chemotherapy, is prone to relapse. We have recently selected from human osteosarcoma MG63 cells a cancer stem-like cell line (3AB-OS), which has unlimited proliferative potential, high levels of stemness-related markers, and in vivo tumorforming capacity in xenograft assays. Here, we have shown that 3AB-OS cells can differentiate in vitro into endoderm-, mesoderm-and ectoderm-derived lineages. Cell differentiation is morphological, molecular and functional. We propose that this model system of 3AB-OS differentiation in vitro might have a number of useful purposes, among which the study of molecular mechanisms of osteosarcoma origin, and the analysis of factors involved in specification of the various cell lineages. We still do not know either what are the shared and distinguishing characters between CSCs and normal stem cells, or what is the reason why the cancer stem cells, like the normal stem cells, have the ability to differentiate toward the derivatives of the primary germ layers. It is possible that each of the differentiation capability may be exploited by CSCs to supply their needs of growing and surviving in hostile microenvironment.

蛇葡萄素调控PPARγ信号通路对骨肉瘤细胞增殖、凋亡、侵袭及迁移的影响

目的:探讨蛇葡萄素(AMP)调控过氧化物酶体增殖物激活受体γ(PPARγ)信号通路对骨肉瘤细胞生物学行为的影响。方法:取生长良好的U2OS细胞进行分组:空白组、20μmol/L AMP组、40μmol/L AMP组、80μmol/L AMP组、80μmol/L AMP+GW9662(PPARγ抑制剂)组、80μmol/L AMP+ROZ(PPARγ激活剂-罗格列酮)组。CCK-8法及克隆形成实验检测细胞增殖;Transwell实验及划痕实验检测U2OS细胞侵袭与迁移;流式细胞术检测U2OS细胞凋亡;Western blot检测Bcl-2、PCNA、MMP-9、PPARγ蛋白表达水平。结果:与空白组相比,20μmol/L AMP组、40μmol/L AMP组、80μmol/L AMP组U2OS细胞增殖、克隆数、侵袭、迁移率、Bcl-2、PCNA、MMP-9表达显著降低,凋亡率、PPARγ表达显著增加(P<0.05);与80μmol/L AMP组相比,80μmol/L AMP+GW9662组U2OS细胞增殖、克隆数、侵袭、迁移率、Bcl-2、PCNA、MMP-9表达显著增加,凋亡率、PPARγ表达显著降低(P<0.05),但80μmol/L AMP+ROZ组U2OS细胞增殖、克隆数、侵袭、迁移率、Bcl-2、PCNA、MMP-9表达显著降低,凋亡率、PPARγ表达显著增加(P<0.05)。结论:AMP通过激活PPARγ信号通路抑制骨肉瘤细胞恶性生物学行为。

ISLR通过活化PI3K-AKT通路促进上皮-间质转化影响骨肉瘤细胞恶性进展研究

目的 研究含免疫球蛋白超家族亮氨酸丰富重复蛋白(immunoglobulin superfamily containing leucine-rich repeat protein,ISLR)参与骨肉瘤细胞恶性进展的作用及其潜在调节机制。方法 通过实时定量聚合酶链反应(qRT-PCR)检测骨肉瘤组织和细胞中ISLR mRNA水平。通过转染ISLR短发夹RNA(short hairpin RNA,shRNA)序列或阴性对照shRNA(negative-control shRNA,NC shRNA)序列至U2OS细胞,后用磷脂酰肌醇3激酶(phosphatidylinositol3 kinase,PI3K)激活剂740 Y-P处理细胞。通过CCK-8法、Transwell实验和流式细胞术分别检测细胞活力、侵袭能力和细胞凋亡率。蛋白印迹实验(Western blot)检测ISLR蛋白、上皮-间质转化(epithelial-mesenchymal transition,EMT)相关蛋白[上皮钙黏蛋白(epitheia-cadherin,E-cadherin)、神经钙黏蛋白(nerve-cadherin,N-cadherin)、波形蛋白(Vimentin),Snail]、PI3K/蛋白激酶B(protein kinase B,AKT)通路相关蛋白、细胞凋亡相关蛋白[半胱天冬氨酸蛋白酶3(cysteinyl aspartate-specific proteinase-3,Caspase-3),B淋巴细胞瘤-2(B cell lymphoma/leukemia-2,Bcl-2),Bcl-2相关X蛋白(Bcl-2 associated X,Bax)]和肿瘤增殖标志物Ki67蛋白表达。采用慢病毒转染的U2OS细胞注射裸鼠构建异种移植瘤模型,监测肿瘤生长情况。结果 与癌旁组织(1.01±0.02)相比,骨肉瘤组织(5.14±1.63)中ISLR mRNA水平显著上调,差异具有统计学意义(t=-14.332,P<0.001)。与正常人成骨细胞hFOB1.19(1.01±0.01)相比,骨肉瘤细胞MG63(3.05±0.57),U2OS(4.55±0.79),HOS(2.46±0.41),Saos-2(2.62±0.44)和143B(3.62±0.51)中ISLR mRNA相对表达均显著升高,差异具有统计学意义(t=4.883,8.473,3.471,3.854,6.247,均P<0.05)。与对照组和NC shRNA组比较沉默ISLR明显抑制了U2OS细胞增殖(t=6.593,6.835)及侵袭(t=8.621,8.448),促进细胞凋亡(t=25.505,25.574),差异具有统计学意义(均P<0.05)。沉默ISLR明显促进U2OS细胞中Caspase-3活性(t=13.489,13.366)及Bax蛋白(t=8.628,8.524)表达,抑制Bcl-2蛋白(t=10.948,10.775)表达,差异具有统计学意义(均P<0.05)。沉默ISLR显著促进EMT相关蛋白E-cadherin(t=15.168,15.087)表达,抑制N-cadherin(t=10.220,10.058),Vimentin(t=8.303,8.164)和Snail(t=9.211,9.384)蛋白表达,降低PI3K/AKT通路关键蛋白PI3K和AKT磷酸化水平(t=17.441,14.452),差异具有统计学意义(均P<0.05)。740 Y-P处理可逆转ISLR沉默对U2OS细胞的影响。裸鼠体内实验显示敲低ISLR显著抑制了肿瘤生长。结论 ISLR可能通过激活PI3K/AKT通路促进骨肉瘤EMT及细胞增殖、侵袭,抑制细胞凋亡,从而促进骨肉瘤进展。

蟾酥诱发人成骨肉瘤MG-63细胞凋亡的作用机制研究

目的探究蟾酥对人骨肉瘤MG-63细胞增殖、凋亡、侵袭、转移的影响及可能作用机制。方法取雄性C57BL/6J小鼠30只,制备空白血清和不同浓度(2.5%和5%)的蟾酥含药血清。取传代培养MG-63细胞,实验分为3组:2.5%蟾酥含药血清组和5%蟾酥含药血清组分别加入相应浓度的蟾酥含药血清培养,对照组加入等体积PBS培养。CCK-8法检测MG-63细胞增殖活性,PNPP法检测细胞中碱性磷酸酶(ALP)活性,茜素红法检测细胞成骨能力,Transwell法检测MG-63细胞侵袭、转移情况,流式细胞仪检测细胞凋亡率及MG-63细胞中整合素α4(Integrinα4)表达情况。结果不同浓度蟾酥含药血清组各时间点细胞增殖率均明显低于对照组(P均<0.05),且5%蟾酥含药血清组均明显低于同期2.5%蟾酥含药血清组(P均<0.05);不同浓度蟾酥含药血清组细胞凋亡率、ALP活性均明显高于对照组(P均<0.05),且5%蟾酥含药血清组均明显高于2.5%蟾酥含药血清组(P<0.05);茜素红染色显示,不同浓度含药血清组有橘红色结节、边界清楚细胞增多;不同浓度蟾酥含药血清组侵袭性细胞和转移性细胞数量均明显少于对照组(P均<0.05),Integrinα4表达占比均明显低于对照组(P均<0.05),且5%蟾酥含药血清组细胞数量均明显少于2.5%蟾酥含药血清组(P均<0.05),Integrinα4表达占比明显低于2.5%蟾酥含药血清组(P<0.05)。结论蟾酥可以促进MG-63细胞凋亡,抑制细胞增殖、侵袭和转移,改善细胞分化和成骨功能,机制可能与下调Integrinα4表达有关。

骨肉瘤组织中GFRA1、FBN1表达水平及意义

目的探讨胶质细胞系源性神经营养因子受体1(GFRA1)、原纤维蛋白-1(FBN1)在骨肉瘤组织中表达水平及意义。方法收集2017年9月至2019年9月住院手术的66例骨肉瘤患者治疗精细切除骨肉瘤组织标本及癌旁组织标本,同时收集整理其临床分期、肿瘤直径、肿瘤分化程度等临床资料。采用免疫组织化学法检测GFRA1、FBN1蛋白表达;骨肉瘤组织GFRA1、FBN1表达与患者预后的关系采用Kaplan-Meier法分析;多因素Logistic回归分析骨肉瘤患者预后的影响因素。结果与癌旁组织相比,骨肉瘤组织中GFRA1、FBN1阳性表达率明显较高(P<0.05)。GFRA1、FBN1的表达与骨肉瘤患者的临床分期、分化程度、是否发生肺转移、软组织是否浸润有关(P<0.05),与患者性别、年龄、肿瘤直径、肿瘤位置无关(P>0.05);骨肉瘤组织GFRA1、FBN1阳性表达患者3年生存率低于FBN1阴性表达患者(P<0.05)。GFRA1、FBN1阳性表达、肿瘤转移、软组织浸润是骨肉瘤患者预后的独立危险因素(P<0.05)。结论GFRA1、FBN1的表达与骨肉瘤患者的临床病理特征及预后有关,可以作为骨肉瘤患者预后评估的指标。