肿瘤蛋白 53靶基因 1靶向微小 RNA-33a对胶质瘤细胞增殖、凋亡、迁移、侵袭的影响

目的 探讨肿瘤蛋白53靶基因1(TP53TG1)对胶质瘤细胞增殖、凋亡及迁移侵袭的影响和机制.方法 本研究起止时间为2019年1—6月,人正常神经胶质细胞(HA)和神经胶质瘤细胞U251购于上海斯信生物科技有限公司.实时定量PCR(qRT-PCR)检测HA和U251细胞中TP53TG1的表达水平.构建过表达TP53TG1的U251细胞株,噻唑蓝(MTT)法用于评估细胞增殖能力,流式细胞术分析细胞凋亡,Transwell法测定迁移和侵袭数,Western blotting检测细胞周期蛋白D1(Cyclin D1)、细胞周期蛋白激酶抑制剂(P21)、B细胞淋巴瘤-2(Bcl-2)、Bcl相关x蛋白(Bax)、基质金属蛋白酶2(MMP-2)、E钙黏蛋白(E-cad?herin)表达水平.双荧光素酶报告基因实验和Western blotting验证TP53TG1和微小RNA-33a(miR-33a)的靶向关系.结果 与人正常神经胶质细胞HA比较,神经胶质瘤细胞U251中TP53TG1的表达水平[(1.03±0.10)比(0.28±0.03)]显著降低.过表达TP53TG1能够显著抑制U251细胞活力,下调Cyclin D1、Bcl-2和MMP-2蛋白水平,减少细胞迁移数[(138±14.01)个比(72±7.26)个]和侵袭数[(126±12.54)个比(65±6.63)个],上调P21、Bax和E-cadherin蛋白表达,促进细胞凋亡[(8.16±0.86)％比(22.57±2.65)％].TP53TG1能够靶向负性调控miR-33a的表达.过表达miR-33a能够逆转miR-33a对U251细胞增殖、凋亡[(22.68±2.69)％比(11.36±1.20)％]、迁移[(70±7.05)个比(108±11.37)个]和侵袭[(70±7.05)个比(108±11.37)个]的影响.结论 TP53TG1通过靶向miR-33a抑制胶质瘤细胞增殖、迁移和侵袭,促进细胞凋亡.     

LncRNA ZFAS1靶向miR-373导致肝癌细胞顺铂耐药的机制研究#br#

目的　探究长链非编码RNA（LncRNA）锌指结构反义转录本1（ZFAS1）靶向微小RNA（miR）-373导致肝癌细胞顺铂（DDP）耐药的机制。方法　HepG2细胞设正常培养组、si-NC组、si-ZFAS1组,实时荧光定量PCR（qPCR）检测细胞中ZFAS1、miR-373表达水平。在si-NC组、si-ZFAS1组基础上分别添加0、50、100、200、300 μmol/L DDP处理细胞12 h,CCK-8检测细胞增殖情况,Transwell检测细胞侵袭情况,蛋白免疫印迹检测细胞中基质金属蛋白酶（MMP）2、MMP9蛋白表达水平。双荧光素酶验证ZFAS1与miR-373的靶向关系。在si-ZFAS1组基础上添加inhibitor miR-373,检测细胞中MMP2、MMP9蛋白表达水平。结果　si-ZFAS1组细胞中ZFAS1表达水平均低于正常培养组和si-NC组,miR-373表达水平均高于正常培养组和si-NC组（P＜0.05）。si-NC组和si-ZFAS1组经不同浓度顺铂处理后细胞增殖率、侵袭数量、侵袭蛋白MMP2、MMP9表达水平基本呈降低趋势;si-ZFAS1组上述指标分别低于其对应浓度的si-NC组（P＜0.05）。Starbase分析发现,miR-373与ZFAS1存在互补的结合位点并经双荧光素酶验证。si-ZFAS1+inhibitor miR-373组细胞MMP2、MMP9蛋白表达水平高于si-ZFAS1组和si-ZFAS1+inhibitor NC组（P＜0.05）。结论　ZFAS1可能降低肝癌细胞DDP耐药,其机制可能与调控miR-373有关。     

Measurement of basophil-activating capacity of grass pollen allergens, allergoids and hypoallergenic recombinant derivatives by flow cytometry using anti-CD203c

BACKGROUND: The assessment of the basophil-activating potential is an important aspect in the development of improved preparations for specific immunotherapy. The aim of the study was to evaluate the suitability of CD203c expression as a measure of basophil activation to compare allergoids with original allergen extracts, and recombinant hypoallergenic allergen derivatives with recombinant wild-type and natural allergens. METHODS: Heparinized whole blood samples from grass pollen allergic subjects were stimulated with grass pollen allergens and allergen derivatives followed by labelling of the basophils with PE-conjugated anti-CD203c. After lysis of the erythrocytes and fixation, the basophils were detected by flow cytometry. In some experiments, histamine release was determined simultaneously. RESULTS: Grass pollen allergoids revealed a 10-10 000-fold reduction of basophil-activating capacity measured by CD203c expression. The deletion mutant DM4 of rPhl p 5b showed stronger hypoallergenic characteristics in a range of 50-10 000-fold reduction, whereas a combination mutant of rPhl p 5b and Phl p 6 revealed less hypoallergenic features. Histamine release experiments led to a similar outcome as CD203c measurement. CONCLUSIONS: The measurement of CD203c expression on basophils by flow cytometry provides a rapid and sensitive method for the estimation of the allergic or hypoallergenic features of allergen preparations. The results demonstrated the hypoallergenicity of grass pollen allergoids and of the rPhl p 5b variant DM4, which may be a candidate in future preparations for specific immunotherapy.     

Association between microRNA-527 and glypican-3 in hepatocellular carcinoma

The present study aimed to identify the specific microRNAs (miRNAs/miRs) and their corresponding target genes involved in hepatocellular carcinomas (HCCs). Microarray analysis was performed to examine the miRNA expression profiles of four paired HCC and corresponding non-cancerous (N) liver tissues using 985 miRNA probes. The Human miRNA Target database was used to identify the target genes of differentially expressed miRNAs between the HCC and N tissues. The protein expression levels of target genes in the HCC tissues and cell lines were evaluated using western blotting. miRNA-mediated suppression of target gene expression was evaluated by transiently transfecting the miRNA into the HCC cell lines. Of the 985 miRNAs evaluated, four miRNAs were differentially expressed (three upregulated and one downregulated miRNAs). Of these four miRNAs, miRNA-527 was highly downregulated in the HCC tissues. Glypican-3 (GPC-3) was predicted as a target gene of miRNA-527. Western blotting revealed that GPC-3 protein is highly expressed in the HCC tissues and HCC cell lines compared with N and normal cell lines. Transfection with miR-527 resulted in suppression of GPC-3 protein expression in the Cos7 cells. Furthermore, transfection with miR-527 also inhibited the intrinsic expression of GPC-3 in the Huh-7 cell line. This indicated that miR-527 in the HCC tissues may be an important novel miRNA that targets the GPC-3 gene expression. GPC-3, whose expression is regulated by miR-527, may be involved in the development and progression of HCC.     

MicroRNA-539靶向调控E2F转录因子3抑制肝癌的发生与发展

目的 探讨肝癌组织中microRNA-539（miR-539）表达水平及其抑制肝癌细胞增殖的作用机制。方法 收集90例肝癌患者术后肝癌组织及癌旁组织标本,用实时定量聚合酶链反应（Real-time PCR）检测组织中miR-539表达量。在PCL/PRF5、Huh7和QGY-7701肝癌细胞中转染miR-539 模拟物（mimics）,用Real-time PCR检测miR-539表达量。用MTT法检测miR-539对肝癌细胞增殖的影响;用流式细胞仪检测miR-539对肝癌细胞凋亡的影响;用免疫印迹法检测miR-539对肝癌细胞中E2F转录因子3（E2F3）蛋白表达的影响。结果 肝癌组织中miR-539表达量显著低于癌旁组织（P<0.05）;miR-539表达量与肝癌患者性别、年龄及肝癌组织分化程度无关（P>0.05）;与肿瘤直径和淋巴结转移相关（P<0.05）。转染miR-539 mimics组肝癌细胞中miR-539表达量显著高于空白组和miR-539 NC组（P<0.05）。在QGY-7701细胞中,过表达miR-539能显著抑制细胞增殖（P<0.05）,降低E2F3蛋白的表达（P<0.05）,对细胞凋亡无明显作用（P>0.05）。结论 miR-539是肝癌发生中的抑癌因子,可能是通过靶向下调E2F3蛋白水平达到抑制癌细胞的增殖。