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肿瘤是严重威胁人类健康的疾病之一, 其诊断和治疗一直是人们关注的焦点.近年来, 肿瘤的发病率和死亡率呈明显上升趋势, 传统的治疗方法仍存在各种问题, 故寻找新的诊疗手段已势在必行.目前, 肿瘤免疫治疗已经成为该研究领域的热点之一. 相似文献
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原发性肝癌是我国常见恶性肿瘤之一.因其恶性度高、病情进展快,病人一旦出现症状就诊往往已属中晚期,故治疗难度大、疗效差,一般发病后生存时间仅为6个月,死亡率在消化系统恶性肿瘤中列第3位.目前,因为肿瘤-睾丸抗原(CTA)在肝细胞癌诊治中所展现的优越性已引起了广泛关注,编码该抗原的基因被称为肿瘤-睾丸基因.已有不少学者在肝细胞癌中开展了一些CTA的基础研究. 相似文献
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目的 检测NY- ESO -1和LAGE- 1癌症睾丸抗原在肝细胞癌中的表达,探讨其作为肝细胞癌免疫治疗靶标的可行性及其与肝癌生物学行为的关系。方法 逆转录聚合酶链反应(RT -PCR)和免疫组织化学EnVision二步法检测30例肝细胞癌新鲜标本NY ESO -1和LAGE -1的表达;另将191例肝癌石蜡组织制成芯片观察NY- ESO- 1蛋白在肝癌中的分布和表达。结果NY- ESO -1和LAGE -1基因mRNA在肝癌中的阳性表达率分别是33. 3% (10 /30)和16. 7% (5 /30),至少表达1种基因mRNA者为36 7% (11 /30);NY- ESO -1蛋白主要分布在肝癌细胞胞质,有效标本中NY ESO 1表达13 8% (24 /174),小肝癌、中晚期肝癌、发生转移肝癌中的阳性表达率逐渐升高,分别为6 8% (3 /44)、16 2% (21 /130)、23 1% (12 /52),不发生转移的肝癌仅为9 8% ( 12 /122 ),其中转移组与无转移组之间比较差异有统计学意义(P<0 .05),全部病例癌组织与癌旁组织比较差异有统计学意义(P<0 .01)。NY- ESO-1蛋白的阳性表达与肿瘤大小无关,所有癌旁肝组织均未见NY -ESO -1和LAGE -1的mRNA和蛋白的表达。结论 NY -ESO- 1 /LAGE- 1在肝细胞癌组织中的特异性表达提示其可作为肝细胞癌特异性免疫治疗潜在的靶标;NY -ESO -1在肝癌早期出现,随病情进展表达率逐步增高,转移患者最高,提示N 相似文献
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癌/睾丸抗原(Cancer/Testis Antigen,CTA)基因在正常睾丸组织的生殖细胞和多种不同组织类型的癌细胞中特异表达,在其它正常组织不表达或表达水平较低,并且在癌症患者中有抗原性免疫反应,认为是一类理想的肿瘤疫苗靶分子.现已发现90个癌/睾丸抗原基因,分属于45个基因家族.本文综述了CTA基因的特性及其应用基础研究进展. 相似文献
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癌-睾丸抗原SSX-2抗原肽的鉴定及功能分析 总被引:1,自引:0,他引:1
SSX基因又称滑膜肉瘤X断裂点基因(Synovial Sarcoma Xbreakpoint,SSX),是个多成员的基因家族,其中一些成员编码的产物被认为是癌-睾丸抗原(Cancer-Testis Antigen,CTA)。CTA是一类可在多种肿瘤组织中表达,而在睾丸以外的其它正常组织中几乎不表达的抗原。因此,CTA非常适用于肿瘤免疫治疗。目前对SSX基因家族中的SSX-2抗原的研究显示,SSX-2抗原分子作为肿瘤免疫治疗的靶物质有着潜在的应用前景。现将其研究进展综述如下。 相似文献
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为探讨癌-睾丸抗原LEMD1 (LEM domain containing 1)在乳腺癌(breast cancer, BC)中的表达及其对疾病预后的价值,探究LEMD1在BC中发挥的生物学功能及作用机制,采用组织芯片结合免疫组化(immunohistochemistry, IHC)检测BC组织中LEMD1的表达,Kaplan-Meier法分析LEMD1表达与BC患者生存时间的相关性;构建LEMD1过表达及敲减慢病毒载体,分别感染人BC细胞MDA-MB-468(低表达LEMD1)和MCF-7(中表达LEMD1);通过CCK-8、Transwell侵袭迁移及TUNEL凋亡等实验探讨LEMD1过表达、敲减对人BC细胞生物学特性的影响;Western blotting检测PI3K/AKT通路相关蛋白的表达变化。结果显示,LEMD1在BC组织中阳性表达率为95.86%;生存分析显示,LEMD1高表达患者较低表达患者预后更差[风险比(hazard ratio,HR)=3.162,95%CI:1.748~5.721,P=0.000 7]。体外功能实验显示,过表达LEMD1可显著促进MDA-MB-4... 相似文献
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目的 探讨乳腺浸润性微乳头状癌(IMPC)中前列腺干细胞抗原(PSCA)在蛋白和mRNA水平的表达及其与临床病理特征的关系.方法 采用免疫组织化学(LSAB法)检测66例IMPC、67例非特殊型浸润性导管癌(IDC-NOS)中PSCA的表达,比较其差异并分析PSCA的表达与IMPC临床病理特征之间的关系.采用逆转录聚合酶链反应(RT-PCR)检测10例IMPC和10例IDC-NOS癌组织及其对应的正常乳腺组织中PSCA mRNA的表达水平.结果 免疫组织化学染色结果显示,PSCA在66例IMPC中有47例高表达(71.2%,47/66),67例IDC-NOS中35例高表达(52.2%,35/67),两组表达水平之间的差异具有统计学意义(P=0.024);IMPC中PSCA的表达与淋巴结转移呈正相关(P=0.039).RT-PCR结果显示,PSCA在10例IMPC和10例IDC-NOS癌组织中各有7例和5例表达,且全部高于对应的正常乳腺组织;IMPC癌组织中PSCA表达强度明显高于IDC-NOS癌组织.结论 PSCA的表达可能在IMPC淋巴结转移过程中发挥了重要作用.Abstract: Objective To study the expression of prostate stem cell antigen (PSCA) at protein and mRNA levels in invasive micropapillary carcinoma of the breast (IMPC) and to analyze the relationship between PSCA expression and clinicopathologic features. Methods The expression of PSCA protein was analyzed by immunohistochemistry (LSAB) in 66 cases of IMPC and 67 cases of invasive ductal carcinoma, not otherwise specified (IDC-NOS). The association between PSCA expression and clinicopathologic features was also analyzed in IMPC. Furthermore, RT-PCR was used to detect PSCA mRNA in 10 cases of primary IMPC and 10 cases of primary IDC-NOS with paired normal breast tissues, each from the same subject. Results Immunohistochemical analysis revealed the overexpression of PSCA in 47 of 66 (71.2%) cases of IMPC and 35 of 67 (52.2%) IDC-NOS. Statistical analysis showed a significant difference of PSCA expression between IMPC and IDC-NOS (P=0.024). In IMPC, the expression of PSCA was correlated with lymph nodes metastasis (P=0.039). RT-PCR showed the mRNA level of PSCA was significantly higher in primary IMPC and IDC-NOS tissue than that in paired normal breast tissue (7/10 and 5/10, respectively), and it was also significantly higher in primary IMPC tissue than that in IDC-NOS tissue.Conclusion PSCA might play an important role in lymph node metastasis in IMPC. 相似文献
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经过过去20年的努力,癌基因和抑癌基因在神经胶质瘤形成及发展中的核心地位已达共识.然而,在生命科学研究突飞猛进、肿瘤诊断与治疗手段日新月异的今天,我们尚未确立这些核心分子在胶质瘤中作用的靶标,因此,胶质瘤的细胞起源-这一决定着人类最终克服胶质瘤的根本问题再度引起人类的关注. 相似文献
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Silvestre DC Pineda JR Hoffschir F Studler JM Mouthon MA Pflumio F Junier MP Chneiweiss H Boussin FD 《Stem cells (Dayton, Ohio)》2011,29(3):440-451
Cancer stem cells are increasingly recognized as major therapeutic targets. We report here the isolation of glioma stem cells (GSCs) maintaining telomere length through a telomerase-independent mechanism known as alternative lengthening of telomeres (ALTs). TG20 cells were isolated from a glioblastoma multiforme, which had the ALT phenotype. They have no detectable telomerase activity and extremely long and heterogeneous telomeres colocalizing with promyelocytic leukemia bodies. The cancer stem cell potential of TG20 cells was confirmed based on their expression of neural stem cell markers, their capacity of in vitro long-term proliferation and to form intracranial tumors in immune-deficient mice. Interestingly, we found that both in vitro and in vivo TG20 cells were significantly more resistant to ionizing radiation than GSCs with telomerase activity. Analysis of DNA damage foci, DNA double-strand breaks repair, and chromosome instability suggest that radiation resistance was related to interference of ALT pathway with DNA damage response. Therefore, our data show for the first time that the ALT pathway can confer to cancer stem cells the capacity to sustain long-term proliferation as telomerase activity and importantly may also affect treatment efficiency. TG20 cells are thus the first cellular model of GSCs displaying ALT and should prove to be useful for the development of specific treatment strategies. 相似文献
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背景:骨髓间充质干细胞在体内、外均具有较强的向胶质瘤趋向性迁移的能力,可作为基因靶向胶质瘤治疗的理想载体。
目的:在复习相关文献的基础上,探讨骨髓间充质干细胞向脑胶质瘤定向迁移的机制。
方法:由第一作者对CNKI和PUBMED数据库进行检索,英文关键词为“mesenchymal stem cells,bone marrow,glioma”,中文检索词为“间充质干细胞,骨髓,胶质瘤”。共检索到51篇相关文献,根据入选标准最终剩余27篇文章进行归纳总结。
结果与结论:骨髓间充质干细胞对胶质瘤具有较强的趋化性迁移的能力,这与胶质瘤细胞分泌的某些细胞因子和骨髓间充质干细胞表面相应受体之间的相互作用有关。增强骨髓间充质干细胞表面相关受体的表达有助于增强其趋瘤效应,进而增强抗胶质瘤作用。 相似文献
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背景:既往研究发现,miR-486在胶质瘤干细胞(CD133+)中的表达水平显著低于其在胶质瘤非干细胞(CD133-)中的表达水平,但是miR-486对CD133+细胞的影响尚不明确。
目的:探索miR-486对CD133+细胞的作用。
方法:利用流式细胞分选将U87胶质瘤细胞中分为CD133+和CD133-细胞。通过脂质体转染构建miR-486过表达的胶质瘤干细胞。
结果与结论:流式细胞分选和纯化获得高比率的CD133+胶质瘤干细胞。实时反转录PCR检测发现miR-486在CD133+胶质瘤干细胞的表达水平比CD133-胶质瘤细胞明显下降。脂质体转染成功构建miR-486过表达的胶质瘤干细胞,体外实验发现miR-486高表达抑制胶质瘤干细胞的增殖,将其阻滞于G1/S期,并促进凋亡。提示miR-486对胶质瘤干细胞具有抑制作用。中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程 相似文献
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Christina Susanne Mullins Alexander Walter Michael Schmitt Carl-Friedrich Classen Michael Linnebacher 《World Journal of Immunology》2013,3(3):62-67
AIM: To investigate the expression of tumor-antigens and major histocompatibility complex (MHC)-machinery components in glioblastoma multiforme cell lines flow cytometry staining methods were applied.
METHODS: Ten GBM cell lines (three commercially available: U-87 MG, U-138-MG and GMS-10 as well as seven newly established cell lines from individual patients in low-passages: HROG02, HROG04, HROG05, HROG06, HROG10, HROG13 and HROG17) were analyzed for expression of (I) general and (II) GBM-related tumor antigens as well as of (III) components of the MHC machinery by flow cytometry.
RESULTS: All cell lines expressed MHC class I with seven out of the ten being HLA-A02 positive. Four of the seven primary cell lines additionally expressed MHC class II in a constitutive manner. Of note, after interferon gamma (IFN-γ) treatment, all seven cell lines expressed MHC class II. The tumor associated antigens (TAA) EGFR and survivin were expressed at high levels in all cell lines; whereas MART-1, RHAMM, WT-1 and IL-13Rα were expressed by at least half of the cell lines and HER2/neu, MAGE-1 and tyrosinase were expressed only by few cell lines. However, all cell lines expressed at least two of the candidate antigens included into this analysis.
CONCLUSION: No obvious differences between commercially available and newly-established cell lines were observed. Thus, the latter in low-passages are interesting for (therapy-) screening and immunotherapeutic strategies. 相似文献
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背景:关于亚低温运用到神经损伤修复领域的研究已有一些报道,但亚低温对神经干细胞在脑内移植迁移的影响还不太清楚。目的:观察亚低温对移植入脑缺血大鼠侧脑室的骨髓间充质干细胞迁移及脑梗死体积的影响。方法:采用Longa法永久性闭塞SD大鼠大脑中动脉制作局灶性脑缺血损伤模型,50只大鼠随机摸球法分为亚低温组、对照组、假手术组。亚低温组于移植前应用亚低温处理大鼠急性脑缺血损伤,对照组于移植前应用常温处理大鼠急性脑缺血损伤;假手术组大鼠麻醉后分离结扎右侧颈内总动脉。亚低温组和对照组在造模后24 h,在脑立体定向下经侧脑室注射移植用5-BrdU标记的骨髓间充质干细胞。经过5,14,21 d后用免疫组织化学方法检测各组大鼠脑组织BrdU阳性细胞数。结果与结论:骨髓间充质干细胞移植第14天多数标记的骨髓间充质干细胞已经迁移至梗死灶周围,移植后亚低温组各时间点梗死灶周边皮质的BrdU阳性细胞数明显多于对照组(P < 0.05)。与对照组比较,亚低温组在移植前后各个时间点脑梗死体积均显著减小(P < 0.05)。提示移植前宿主亚低温处理可以促进骨髓间充质细胞的定向迁移,且脑梗死体积显著减小。 相似文献
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目的 探讨FOS蛋白在胶质瘤中的表达及其对胶质瘤细胞生长的影响.方法 用免疫组化染色法检测FOS蛋白在各级别胶质瘤组织中的表达水平.应用RNA干扰技术降低FOS表达后,应用四甲基偶氮唑盐微量酶反应比色法和流式细胞技术检测胶质瘤细胞的增殖和周期的改变;应用Transwell实验检测胶质瘤细胞侵袭能力的改变;采用Western印迹法检测FOS下游功能蛋白的变化.结果 胶质瘤组织中FOS的表达随着级别的增高而增高;抑制FOS的表达后,U87和U251细胞生长受抑制,细胞生长阻滞在G1期且细胞侵袭能力下降,下游的功能蛋白CyclinD1和MMP9表达水平降低.结论 FOS在胶质瘤中高表达;抑制其表达可以下调功能蛋白CyclinD1和MMP9的表达,进而调控细胞的生长和侵袭能力. 相似文献
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干细胞分化抗原和细胞增殖抗原在人胶质瘤细胞株中的表达 总被引:1,自引:0,他引:1
研究表明肿瘤组织中存在肿瘤干细胞(tumor stem cells,TSC).TSC具有自我更新、无限增殖和多向分化等干细胞的生物学特性,并且表达多种干细胞分化抗原[1].这些干细胞抗原在胶质瘤组织中也大量表达[2].通过建立在干细胞分化抗原基础上的肿瘤细胞亚群分离技术,已经在胶质瘤组织和胶质瘤细胞株中分离和鉴定出TSC[3-4],但各种干细胞分化抗原在胶质瘤细胞株中的表达状况尚不清楚.我们在本研究中检测人胶质母细胞瘤细胞株中干细胞分化抗原和细胞增殖抗原的表达,为进一步研究TSC打下基础. 相似文献