miR-210-3p通过靶向ATG7抑制人膀胱癌细胞J82的自噬和诱导凋亡

目的探索miR-210-3p抑制人膀胱癌细胞J82机制。方法应用定量实时PCR(qRTPCR)检测miR-210-3p及其靶基因自噬相关基因7(autophagy-related gene 7,ATG7)在J82细胞中的表达。为验证miR-210-3p和ATG7之间的生物学关系,进行荧光素酶报告检测。通过体外实验研究miR-210-3p和ATG7在J82细胞中的生物学功能,包括CCK-8法检测细胞增殖情况,hoechst染色检测细胞凋亡,western blot检测细胞自噬。结果 miR-210-3p表达明显下调ATG7表达水平,生物信息学预测和荧光素酶报告实验证明miR-210-3p抑制ATG7是通过直接结合到ATG7 3’-未翻译区域(3’-UTR)。在J82细胞中,miR-210-3p上调可抑制ATG7表达、细胞自噬和细胞增殖,同时诱导细胞凋亡。结论 miR-210-3p通过负调控ATG7抑制细胞增殖和自噬,并促进凋亡,从而促进膀胱癌细胞J82细胞死亡。因此,在膀胱癌中抑制自噬对于开发针对膀胱癌的自噬靶向治疗至关重要。本研究补充了miRNA调控膀胱癌的相关机制。     

miR-152-3p 靶向TCF4 对人胃癌SGC-7901 细胞增殖和凋亡的调控作用

目的:探究miR-152-3p 对人胃癌SGC鄄7901 细胞增殖和凋亡的作用及机制。方法:用miR鄄152 类似物(miR-152 mimic) 转染细胞,RT鄄PCR 检测miR-152 及转录因子4(TCF4) 的表达;荧光素酶报告实验证明miR1523p 与TCF4 的靶 向关系;miR-152 mimic 和TCF pcDNA 重组质粒(pc鄄TCF4) 分别或同时转染细胞,Western blot 检测TCF4 的表达,CCK8 检测细 胞增殖情况;流式检测细胞凋亡情况。结果:miR152 mimic 能显著升高SGC鄄7901 细胞miR-1523p 的表达水平,降低TCF4 的 mRNA 水平;同时,miR152 mimic 还能显著降低TCF4 野生型荧光素酶活性;此外,miR-152 mimic 能显著降低SGC-7901 细胞 的增殖倍数,升高细胞凋亡率;pc-TCF4 能显著减弱miR-152 mimic 抑制SGC7901 细胞增殖及诱导细胞凋亡的作用。结论: miR-1523p 能抑制人胃癌SGC7901 细胞增殖并诱导细胞凋亡,作用机制与靶向调控TCF4 表达有关。     

miR-142-3p 靶向ATG4c 调控RAW264.7 巨噬细胞自噬

目的:研究miR-142-3p 对自噬相关基因ATG4c 的靶向调控作用,探究miR-142-3p 影响RAW264.7 细胞自噬途径的作用机制。方法:生物信息学软件分析miR-142-3p 的靶基因为ATG4c,构建pMIR-Report-ATG4c 和pMIR-Report-ATG4c mut 重组质粒,双荧光素酶报告系统、qRT-PCR、Western blot 验证miR-142-3p 与ATG4c 的靶向作用;将做不同处理的RAW264.7 细胞分为4 组:正常细胞作为对照、50 ng/ ml 雷帕霉素作用2 h、EBSS 饥饿作用12 h、10 nmol/ L 的3-甲基腺嘌呤(3-MA)作用12 h 后,实时荧光定量PCR(qRT-PCR)检测miR-142-3p 不同干预组中的相对表达情况;将miR-142-3p mimics、miR- 142-3p inhibitor 及miR-142-3p control 分别转染到RAW264.7 细胞中,检测miR-142-3p 和LC3域的相对表达。结果:双荧光素酶报告系统、qRT-PCR、Western blot 验证miR-142-3p 通过靶向作用于ATG4c 的3忆-UTR 抑制其表达;与对照组相比,雷帕霉素和饥饿处理的RAW264.7 细胞miR-142-3p 明显上调,而3-MA 处理组miR-142-3p 明显下调;与miR-142-3p control 组相比,转染miR-142-3p mimics 组中LC3域蛋白表达显著下调,而miR-142-3p inhibitor 组中表达显著上调。结论:miR-142-3p 通过靶向调控自噬相关基因ATG4c,参与RAW264.7 小鼠巨噬细胞自噬的调控。     

miR-142-5p regulates pancreatic cancer cell proliferation and apoptosis by regulation of RAP1A

Pancreatic cancer, one of the fatal and aggressive malignancies, leads the sixth cancer-associated death in China. microRNAs are believed to exert function in the diagnosis and treatment of pancreatic cancer. In the present study, we firstly found that miR-142-5p was downregulated in pancreatic cancer tumor tissues while Ras-related protein Rap-1 A (RAP1A) was upregulated compared with para-carcinoma non-tumor tissues. Then, we found that RAP1A could be a putative target gene of miR-142-5p by bioinformatics tool TargetScan. Furthermore, we conducted luciferase reporter assay, RT-qPCR, western blot and correlation analysis to demonstrate that miR-142-5p could negatively regulate RAP1A expression by binding to its 3′UTR. In addition, cell-counting kit 8 (CCK-8) and flow cytometry assays certified that miR-142-5p overexpression may inhibit pancreatic cancer cell proliferation but promote cell apoptosis; while the variation could be reversed by co-transfected with pcDNA3.1-RAP1A. Finally, miR-142-5p overexpression downregulated p-ERK1/2, phosphate p38 mitogen-activated protein kinases (p-p38); however, the variation induced by miR-142-5p mimic could be reversed by co-transfected with pcDNA3.1-RAP1A. In conclusion, our findings indicate that targeting miR-142-5p may provide a novel strategy for the treatment of pancreatic cancer.     

Clinicopathologic significance of CXCR4 expressions in patients with esophageal squamous cell carcinoma

AimsThis study was designed to investigate the biological function of CXCR4 in esophageal squamous cell carcinoma and to explore the underlying mechanism to provide potential targets for esophageal squamous cell carcinoma.MethodsA total of 101 patients with esophageal squamous cell carcinoma were included, and the relationship between CXCR4 and clinicopathological factors was analyzed. Laser scanning confocal microscopy was used to observe numbers of autophagosomes in TE-1 cell line and the ability of proliferation and invasion were evaluated meanwhile.ResultsCXCR4 is overexpressed in ESCC specimens and is associated with poor differentiation and lymphocyte metastasis. In the survival analysis, CXCR4 predicted a poor overall survival prognosis. The number of autophagosomes in the siR-CXCR4 group was decreased compared with negative group (P < 0.05), while was increased in the pcDNA3.1-CXCR4 group (P < 0.05).Western blot result show upregulation of LC3II, the ratio of LC3II/LC3I and Beclin1 in pcDNA3.1-CXCR4 group and decreased expression of LC3II, the ratio of LC3II/LC3I and Beclin1 in siR-CXCR4 group. Transwell assay show CXCR4 overexpression promote the invasion of TE-1 cells and was attenuated by autophagy inhibitor 3-Methyladenine.On the contrary, invasion cell numbers decreased in siR-CXCR4 group and was rescued by autophagy inducer Rapamycin.ConclusionCXCR4 is an indicator of poor prognosis for ESCC. CXCR4 promote autophagy and regulate cell invasion through autophagy in ESCC. Our study provides new insights for the treatment of esophageal squamous cell carcinoma and CXCR4 may serve as a therapeutic target for ESCC.     

The effect and mechanism of miR-210 in down-regulating the autophagy of lung cancer cells

This project aims to investigate the roles of miR-210 in autophagy of lung cancer cells and the related mechanism. The expressions of miR-210 and ATG7 in 30 cancer tissues and the adjacent tissues in patients with lung cancer were compared using RT-qPCR methods, Western Blot assay was carried out to test the expression of ATG7 in protein. Moreover, the dual luciferase reporter gene assay system was used to confirm ATG7 is a target gene of miR-210. Furthermore, lung cancer cell line A549 was transfected with either miR-210 mimics or inhibitors and RT-qPCR methods was used to detect the expression of miR-210 and ATG7. Next, MTT assay was used to examine the effect of miR-210 on the growth of the lung cancer cells, and finally, the expression of autophagy related genes, ATG7, LC3-II/LC3-I and Beclin-1 were detected by Western Blot and ICC assay. We observed that miR-210 was significantly increased and ATG7 was markedly decreased in cancer tissue of patients with lung cancer compared with normal tissue. Moreover, results of dual luciferase reporter assay indicated that ATG7 is a direct target of miR-210. Next, transfection of miR-210 mimics in lung cancer cells induced significant increase in cell proliferation, and transfection of miR-210 inhibitors lead to inhibited cell proliferation. Furthermore, over-expression of miR-210 induced marked decrease in the expression of ATG7, LC3-II/LC3-I and Beclin-1, while transfection of miR-210 inhibitors induced significant increase in the expression of ATG7, LC3-II/LC3-I and beclin-1. Our results suggested that miR-210 plays a great role in autophagy of lung cancer cell by targeting ATG7.     

miR-98-5p对STAT3诱导的人舌鳞癌细胞SCC-25凋亡、 增殖和成瘤性的影响*

目的：探讨miR-98-5p 对人舌鳞癌细胞SCC-25 凋亡和肿瘤干样特性及裸鼠成瘤的影响。方法：将SCC-25 细胞转染mimic mock、miR-98-5p mimic、inhibitor-NC、miR-98-5p inhibitor 后分为对照（ control）组、模拟物 对照（ mimic-mock）组、模拟物（ mimic）组、抑制剂阴性对照（ inhibitor-NC）组和抑制剂（ inhibitor）组。 逆转录- 聚合酶链反应（ RT-PCR）检测miR-98-5p 表达;克隆形成法检测细胞增殖;流式细胞仪检测细胞凋亡; RT-PCR 检测Ki67、增殖细胞核抗原（ PCNA）、Bax、Bcl-2 mRNA水平;细胞成球实验检测细胞成球体积、成 球数目;免疫印迹检测信号转导和转录活化因子3（ STAT3）磷酸化情况;建立移植瘤裸鼠模型,慢病毒转染 mimic,将裸鼠随机分为control 组和mimic 组,检测肿瘤质量和体积,免疫印迹检测STAT3 磷酸化情况,免疫组 织化学检测Ki67 阳性表达率。结果：与control 组相比较,mimic 组miR-98-5p 水平显著升高,克隆形成率显著降低, 凋亡率显著升高,Ki67、PCNA mRNA水平显著降低,Bax/Bcl-2 比值升高,成球体积、成球数目显著降低,p-STAT3/ STAT3 水平显著降低;inhibitor 组miR-98-5p 水平显著降低,克隆形成率显著升高,Ki67、PCNA mRNA水平显 著升高,Bax/Bcl-2 比值降低,成球体积、成球数目显著升高,p-STAT3/STAT3 水平显著升高;mimic 组肿瘤质 量显著降低,肿瘤体积显著降低,Ki67 阳性表达率显著降低,p-STAT3/STAT3 水平显著降低。结论：miR-98-5p mimic 可通过抑制STAT3 诱导人舌鳞癌细胞SCC-25 凋亡,抑制增殖和移植瘤生长。     

Suppression of hepatocellular carcinoma by baculovirus-mediated expression of long non-coding RNA PTENP1 and MicroRNA regulation

Long non-coding RNAs (lncRNAs) play regulatory roles in cancers. LncRNA PTENP1 is a pseudogene of the tumor suppressor gene PTEN but its roles in hepatocellular carcinoma (HCC) have yet to be explored. Here we confirmed that PTENP1 and PTEN were downregulated in several HCC cells, thus we constructed Sleeping Beauty (SB)-based hybrid baculovirus (BV) vectors for sustained PTENP1 lncRNA expression. Co-transduction of HCC cells with the SB-BV vector expressing PTENP1 elevated the levels of PTENP1 and PTEN, which suppressed the oncogenic PI3K/AKT pathway, inhibited cell proliferation, migration/invasion as well as induced autophagy and apoptosis. The overexpressed PTENP1 decoyed oncomirs miR-17, miR-19b and miR-20a, which would otherwise target PTEN, PHLPP (a negative AKT regulator) and such autophagy genes as ULK1, ATG7 and p62, indicating that PTENP1 modulated the HCC cell behavior and gene networks by miRNA regulation. Injection of the PTENP1-expressing SB-BV vector into mice bearing HCC tumors effectively mitigated the tumor growth, suppressed intratumoral cell proliferation, elicited apoptosis, autophagy and inhibited angiogenesis. These data collectively unveiled the molecular mechanisms of how PTENP1 repressed the tumorigenic properties of HCC cells and demonstrated the potential of the SB-BV hybrid vector for PTENP1 lncRNA modulation and HCC therapy.     

miR-483-5p通过上调IGF2基因转录促进肝癌细胞生长、迁移与侵袭

目的:探讨miR-483-5p对人胰岛素样生长因子2(IGF2)基因P3启动子驱动的m RNA(P3 m RNA)表达的影响及其在肝细胞癌发生发展中的作用。方法:(1)采用real-time PCR检测人肝癌细胞株Huh7、Hep3B、Bel-7402、Hep G2和SMMC-7721,人正常肝细胞株HL-7702,83例人肝细胞癌组织和配对的癌旁组织,22例正常肝组织中miR-483-5p和P3 m RNA的表达水平,并应用Pearson相关分析评估P3 m RNA与miR-483-5p表达水平之间的关系。(2)将IGF2基因P3 m RNA的5’端非翻译区(5’UTR)克隆入p GL3启动子载体,构建P3 m RNA 5’UTR野生型(p GL3-P3-5’UTR-WT)及P3 m RNA 5’UTR突变型(p GL3-P3-5’UTR-MUT)重组萤光素酶报告质粒,将其分别与miR-483-5p mimic、miR-483-5p inhibitor及scrambled control共转染He La、293T及Huh7细胞,采用双萤光素酶报告系统检测萤光素酶活性。(3)分别将miR-483-5p mimic、miR-483-5p inhibitor及scrambled control转染Huh7及Hep3B肝癌细胞,应用real-time PCR检测这2种肝癌细胞P3 m RNA表达水平的变化。(4)应用real-time PCR检测肝癌细胞Huh7及Hep3B的细胞核和细胞质中miR-483-5p的表达水平;应用核连缀实验(nuclear run-on assay)分析miR-483-5p对P3 m RNA转录的影响;应用RNA稳定性实验分析miR-483-5p对P3 m RNA稳定性影响。(5)应用体外细胞功能实验研究miR-483-5p对Huh7肝癌细胞生长、凋亡、迁移与侵袭能力的影响。结果:(1)5种肝癌细胞株miR-483-5p及P3 m RNA表达水平均明显高于正常肝细胞株HL-7702(P0.01),肝细胞癌组织中miR-483-5p及P3 m RNA表达水平均明显高于配对的癌旁组织及正常肝组织(P0.01);线性相关分析显示,在5种肝癌细胞株及肝细胞癌组织中,P3 m RNA表达水平均与miR-483-5p水平呈正相关。(2)萤光素酶实验显示,miR-483-5p与P3m RNA 5’UTR的同源位点互补结合可促进P3 m RNA的表达。(3)瞬时转染实验显示,过表达miR-483-5p呈剂量依赖性促进Hep3B和Huh7肝癌细胞P3 m RNA表达水平的增高。(4)miR-483-5p表达实验显示,成熟miR-483-5p存在于肝癌细胞Hep3B和Huh7的细胞质和细胞核中;核连缀实验显示,miR-483-5p诱导Huh7肝癌细胞核中新生P3 m RNA转录;RNA稳定性实验表明,miR-483-5p不改变Huh7肝癌细胞P3 m RNA稳定性。(5)体外细胞功能实验显示,miR-483-5p促进Huh7肝癌细胞增殖,抑制其凋亡,并增强迁移与侵袭能力。结论:miR-483-5p高表达可部分通过上调IGF2基因P3 m RNA转录促进肝癌细胞生长、迁移与侵袭,进而参与肝细胞癌发生。     

miR-155-5p在宫颈癌血清中的表达及其对宫颈癌细胞的影响

 目的：检测miR-155-5p在不同宫颈疾病患者血清中的表达差异,并分析其对宫颈癌细胞增殖、细胞周期和凋亡的影响,探讨miR-155-5p在宫颈癌发生、发展中的可能作用机制。方法：采用SYBR GreenⅠ实时荧光定量PCR法,检测并分析比较miR-155-5p在不同宫颈疾病患者血清中的表达差异。利用miR-155-5p mimic或inhibitor提高或降低宫颈癌细胞中miR-155-5p的表达。CCK-8法和流式细胞术检测宫颈癌细胞的增殖、细胞周期和凋亡。结果：宫颈癌组血清中miR-155-5p的表达高于宫颈炎组和健康对照组（P<0.05）,宫颈上皮内瘤样病变组和宫颈癌组血清中miR-155-5p的表达差异无统计学意义（P>0.05）。与空白组、脂质体组和阴性对照组相比,转染100 nmol/L和200 nmol/L miR-155-5p mimic的SiHa细胞中,S期细胞比例升高,凋亡细胞比例降低（P<005）。转染100 nmol/L和200 nmol/L miR-155-5p inhibitor的SiHa细胞中,G2/M期细胞比例明显增多（P<005）。结论：(1)宫颈癌患者血清中miR-155-5p表达较健康对照人群上调,可能作为宫颈癌早期诊断的肿瘤分子标志物。(2)miR-155-5p对宫颈癌HeLa细胞增殖、细胞周期和凋亡无明显影响。(3)miR-155-5p可促进宫颈癌SiHa细胞进入S期,并抑制SiHa细胞凋亡,提示miR-155-5p可能在宫颈鳞癌发生、发展中起作用。     

MicroRNA-146b-5p suppresses cholangiocarcinoma cells by targeting TRAF6 and modulating p53 translocation

BackgroundIn view of the poor prognosis and high mortality of cholangiocarcinoma, there is a need for new therapeutic strategies. This study aims to reveal the biological function of miR-146b-5p in cholangiocarcinoma cell and its possible mechanism.MethodsThe expression level and prognostic information on miR-146b-5p in cholangiocarcinoma were obtained in TCGA database. The biological function of miR-146b-5p on proliferation and vitality of cholangiocarcinoma cell HUCCT-1 was examined by EdU and MTT assay, and the apoptosis of HUCCT-1 cells transfected with miR-146b-5p mimic, mimic control, inhibitor, inhibitor control was detected by flow cytometry analysis. The western blot was done to evaluate the effect of miR-146b-5p targeting substrate and the expression of p53 in whole-cell protein and mitochondria fractions.ResultsOur finding revealed that miR-146b-5p expression in patients with CHOL was lower than the normal group(p＜0.001). MiR-146b-5p expression was down-regulated in human cholangiocarcinoma HUCCT-1 and RBE cells compared to normal control HIBEC and other cancer cells. The miR-146b-5p mimic could inhibit HUCCT-1 cell proliferation (p＜0.05) and promote HUCCT-1 cell apoptosis significantly (p＜0.05). The results of western blot showed that miR-146b-5p mimic could directly target TRAF6 3′UTR region and up-regulate the expression of p53 in mitochondria and miR-146b-5p inhibitor could down-regulated the level of p53 in mitochondria.ConclusionMiR-146b-5p is a cholangiocarcinoma suppressor by inhibiting cell proliferation and promoting cell apoptosis with targeting TRAF6, possibly via modulating p53 translocation to mitochondria.     

Upregulation of miR‑95-3p inhibits growth of osteosarcoma by targeting HDGF

Osteosarcoma is the most common bone malignancy and miR-95-3p plays an important role in multiple cancers. The purpose of this study was to explore the effect and potential mechanism of miR-95-3p on the growth of osteosarcoma. In vitro, the osteosarcoma cell lines, SAOS-2 and U2OS cells, were transfected with miR-95-agomir to assess the role of miR-95-3p in proliferation and apoptosis of osteosarcoma cells. We determined that overexpression of miR-95-3p significantly attenuated cell proliferation but enhanced apoptosis in SAOS-2 and U2OS cells. We also found that overexpression of miR-95-3p in osteosarcoma cells downregulated the expression of hepatoma-derived growth factor (HDGF). Next, knockdown of HDGF by siRNA targeting HDGF clearly inhibited cell proliferation and induced apoptosis in U2OS cells. In vivo, a tumor formation assay in BALB/c nude mice was conducted by injecting the pre-miR-95 or control vector lentivirus-infected U2OS cells to determine the effect of miR-95-3p on the growth of osteosarcoma. Results showed miR-95-3p overexpression inhibited the osteosarcoma growth and downregulated the HDGF expression in xenografted tumor. For mechanism study, we co-transfected HDGF/pcDNA3.1 plasmid and miR-95-agomir to U2OS cells, and we demonstrated that overexpression of HDGF could attenuate the effects of miR-95-3p on U2OS cell proliferation, apoptosis and migration. These findings indicated that miR-95-3p might act as a potential tumor suppressor in osteosarcoma by targeting HDGF. Thus, miR-95-3p may become a potential therapeutic in treatment of osteosarcoma.     

TFDP3对前列腺癌LNCaP细胞自噬及凋亡调控作用的初步研究

目的:研究TFDP3对前列腺癌LNCaP细胞自噬及凋亡作用的影响,以及探讨TFDP3与E2F1相互作用后对前列腺癌LNCaP细胞自噬及凋亡的调控作用。方法:采用重组质粒pcDNA3.1-TFDP3,pCMV-E2F1-HA分别转染LNCaP细胞,并设空载体对照组。转染24 h后提取细胞总RNA和蛋白,以实时定量RT-PCR检测TFDP3、E2F1、以及LC3B基因表达的变化,Western blot方法检测自噬相关基因(LC3B)蛋白表达水平的变化。并采用流式细胞仪检测细胞凋亡的变化。结果:TFDP3可以诱导LNCaP细胞中自噬基因LC3B的表达,并且这种作用可以受到E2F1的抑制;TFDP3可以抑制E2F1诱导的细胞凋亡。结论:TFDP3可以诱导LNCaP细胞中自噬基因LC3B的表达,可以抑制E2F1诱导的细胞凋亡,提示TFDP3在前列腺癌细胞中发挥着重要的调控作用。     

长链非编码RNA HULC对肺癌细胞增殖及自噬的调控

目的探讨长链非编码RNA HULC对非小细胞肺癌增殖及其与自噬的关系。方法采用实时定量PCR检测48例肺癌组织以及相应正常肺组织中HULC的表达水平,并检测HULC在肺癌细胞系及正常肺细胞系中的表达情况。通过pcDNA3.1-HULC转染肺癌细胞系A549、95D过表达HULC;采用CCK-8试剂盒检测细胞增殖改变情况;Western blot、免疫荧光检测自噬相关蛋白LC3Ⅱ/Ⅰ、LC3斑点数目变化情况以及自噬相关蛋白Atg7的表达变化。结果HULC在肺癌组织中的表达高于正常肺组织,差异有统计学意义(P<0.05);过表达HULC能促进肺癌细胞增殖,且过表达HULC促进肺癌细胞中LC3-Ⅰ向LC3-Ⅱ的转化和Atg7的表达增加(P<0.05);免疫荧光可见过表达HULC后LC3荧光斑点明显增多。结论肺癌组织中HULC的表达高于正常肺组织,HULC促进肺癌细胞增殖与提高肺癌细胞自噬水平,且与自噬相关蛋白ATG7相关。     

miR-296-5p 靶向 PLK1 调控 PI3K/ AKT 通路诱导骨肉瘤细胞中的自噬并抑制上皮-间质转化

目的 探讨 miR-296-5p 靶向 PLK1 对骨肉瘤 (osteosarcoma, OS) 细胞自噬及抑制上皮-间质转化 (EMT) 的作用机制。 方法 qRT-PCR 检测 miR-296-5p 在 OS 细胞中的表达。 采用生物信息学分析预测 miR-296-5p 的靶基因, 验证 miR-296-5p 对靶基因 PLK1 的直接靶向调控; 细胞转染构建 miR-296-5p 过表达 和干扰细胞, CCK-8、 克隆形成、 Transwell 小室、 流式、 蛋白免疫印迹实验检测 miR-296-5p 的不同表达对 U2OS 细胞中 PTBP1 表达水平及细胞增殖、 侵袭、 凋亡、 自噬及 EMT 的影响。 结果 与对照组比较, miR-296-5p 在 OS 中表达降低, 而 PLK1 则升高 (P< 0. 05); 与 miR-NC 组比较, mimic 组的克隆形成率、 侵袭 细胞数目及 PTBP1、 p62、 N-cadherin、 Vimentin、 p-PI3K/ PI3K、 p-AKT/ AKT 水平降低, 细胞凋亡率、 Beclin-1、 LC3-Ⅱ/ Ⅰ、 E-cadherin 水平升高 (P< 0. 05); 与 PLK1 组比较, PLK1 + mimic 组的克隆形成率、 侵袭 细胞数目及 PTBP1、 p62、 N-cadherin、 Vimentin、 p-PI3K/ PI3K、 p-AKT/ AKT 水平降低, 细胞凋亡率、 Beclin-1、 LC3-Ⅱ/ Ⅰ、 E-cadherin 水平升高 (P< 0. 05)。 结论 miR-296-5p 可能能够靶向 PLK1 调控 PI3K/ AKT 通路诱导 OS 细胞中的自噬并抑制 EMT。     

舒芬太尼诱导宫颈癌细胞自噬和凋亡并抑制癌细胞恶性增殖

目的 探讨舒芬太尼对宫颈癌细胞 SiHa 自噬、 凋亡及细胞增殖的影响。 方法 采用 CCK8 法检 测舒芬太尼梯度浓度 (3. 125、 6. 25、 12. 5、 25、 50、 100、 200、 400、 800 nmol / L) 作用下宫颈癌细胞 SiHa 细胞活力, 选取 4 个舒芬太尼作用浓度 (0、 25、 50、 100 nmol / L) 处理 SiHa 细胞 24 h, 采用流式细胞法、 克隆形成实验检测 SiHa 细胞凋亡及增殖情况, 免疫荧光法检测各组细胞 LC3 水平, 采用 Western 印迹检测 自噬相关蛋白 LC3Ⅱ/ LC3Ⅰ、 Beclin1、 ATG7 与增殖、 凋亡相关蛋白 P21、 Survivin 水平, 采用 RT-PCR 检测 细胞增殖相关基因 Ki67、 PCNA 表达水平。 结果 随着舒芬太尼处理浓度的增加, SiHa 细胞活力逐渐降低。 50、 100 nmol / L 舒芬太尼处理下 SiHa 细胞的 LC3Ⅱ/ LC3Ⅰ、 Beclin1、 ATG7 水平显著高于 0 nmol / L 舒芬太 尼处理, 免疫荧光检测结果显示 50、 100 nmol / L 舒芬太尼处理下 LC3 荧光信号高于 0 nmol / L 舒芬太尼处 理, 流式细胞仪检测结果显示 50、 100 nmol / L 舒芬太尼处理下 SiHa 细胞凋亡高于 0 nmol / L 舒芬太尼处理。 克隆形成实验结果显示 50、 100 nmol / L 舒芬太尼处理下 SiHa 细胞克隆形成率降低, Survivin 水平与 Ki67、 PCNA 表达水平降低, 而 P21 水平升高。 结论 舒芬太尼对宫颈癌细胞自噬、 凋亡有促进作用, 对细胞增 殖有抑制作用, 可能与调节细胞自噬、 凋亡、 增殖相关蛋白或基因水平有关。     

Rab5 GTPase对膀胱癌细胞自噬及增殖的调控

目的探讨Rab5 GTPase对膀胱癌细胞自噬及增殖的影响。方法采用实时定量PCR检测60例膀胱癌组织以及相应正常膀胱组织中Rab5 mRNA的表达水平,并检测Rab5 mRNA在膀胱癌细胞系及正常膀胱细胞系中的表达情况。通过pcDNA3.1-Rab5转染膀胱癌细胞系BIU-87、RT4过表达Rab5;免疫荧光、Western blot检测自噬相关蛋白LC3Ⅱ/Ⅰ、LC3斑点数目变化情况以及自噬相关蛋白Vps34的表达变化;采用CCK-8检测膀胱癌细胞的增殖改变情况。结果Rab5 mRNA在膀胱癌组织中的表达高于正常膀胱组织,Rab5 mRNA在膀胱癌细胞中的表达高于正常膀胱细胞系,差异有统计学意义(P<0.05);免疫荧光显示过表达Rab5后LC3荧光斑点明显增多,且过表达Rab5促进膀胱癌细胞中Vps34的表达增加及LC3-Ⅰ向LC3-Ⅱ的转化;过表达Rab5能促进膀胱癌细胞增殖(P<0.05)。结论膀胱癌组织中Rab5 mRNA的表达高于正常膀胱组织,Rab5提高膀胱癌细胞自噬水平并促进膀胱癌细胞增殖,且与自噬相关蛋白Vps34相关。     

BDNF-AS/miR-145-5p轴对高糖诱导的肾小管上皮细胞损伤的影响CSCD

目的探讨脑源性神经营养因子反义RNA(brain-derived neurotrophic factor-antisense, BDNF-AS)对高糖诱导的肾小管上皮细胞损伤的影响和可能机制。方法体外培养肾小管上皮细胞HK-2, 分别转染BDNF-AS小干扰RNA、miR-145-5p模拟物或共转染BDNF-AS小干扰RNA和miR-145-5p抑制剂, 之后采用30 mmol/L葡萄糖干预转染后的细胞24 h, 用RT-qPCR法检测细胞中BDNF-AS和miR-145-5p的表达, 用CCK-8法检测细胞增殖, 流式细胞术检测细胞凋亡, Western印迹法检测细胞中Bcl-2和Bax蛋白的表达, 酶联免疫吸附法检测细胞培养上清中IL-1β和IL-6的水平。用双荧光素酶报告基因实验验证BDNF-AS和miR-145-5p的调控关系。结果高糖处理促进了HK-2细胞中BDNF-AS的表达(P<0.05), 而抑制了miR-145-5p的表达(P<0.05)。干扰BDNF-AS或过表达miR-145-5p降低了高糖诱导的HK-2细胞抑制率、凋亡率及Bax蛋白、IL-1β和IL-6的表达(P<0.05), 促进了Bcl-2蛋白的表达(P<0.05)。干扰miR-145-5p逆转了干扰BDNF-AS对高糖诱导的HK-2细胞增殖、凋亡及IL-1β和IL-6表达的影响。BDNF-AS可靶向结合并负调控miR-145-5p。结论干扰BDNF-AS可能通过靶向负调控miR-145-5p促进高糖诱导的肾小管上皮细胞增殖, 并抑制细胞凋亡及炎症因子表达。     

Inhibition of autophagy enhances anticancer effects of bevacizumab in hepatocarcinoma

Angiogenesis inhibitors have long been considered desirable anticancer agents. However, it was found that many tumors could develop resistance to antiangiogenesis inhibitors. Antiangiogenic therapy results in metabolic stress. Autophagy is an important survival mechanism in cancer cells under metabolic stress; however, it remains unknown if autophagy contributes to antiangiogenesis resistance. In this study, we reported that bevacizumab treatment reduced the development of new blood vessels and inhibited cell growth in xenografts of hepatocellular carcinoma (HCC) tumors. Bevacizumab treatment also upregulated expression of the autophagy-related genes (Beclin1 and LC3) and increased autophagosome formation. Our in vitro studies demonstrated that autophagy inhibition significantly increased apoptosis of HCC cells during nutrient starvation or hypoxia. In addition, the combined treatment of an autophagy inhibitor and bevacizumab markedly inhibited the tumor growth of HCC xenografts, led to enhanced apoptosis, and impaired the proliferation of tumor cells compared with treatment with either drug alone. Furthermore, autophagy inhibition led to enhanced reactive oxygen species (ROS) generation in HCC cells exposed to nutrient starvation or hypoxia in vitro and increased DNA oxidative damage in vivo. Antioxidants reduced nutrient starvation or the hypoxia-induced cell death of HCC cells after autophagy inhibition. Our results suggest that autophagy modulates ROS generation and contributes to cell survival under metabolic stress. Therefore, autophagy inhibition may be a novel way of increasing the efficicacy of antiangiogenic agents in the treatment of HCC.     

miR-211通过靶向调控TFAM抑制人乳腺癌细胞系增殖

目的探讨miR-211靶向线粒体转录因子A(TFAM)对人乳腺癌细胞增殖的影响。方法用miR-211及TFAM作为研究对象。首先,在乳腺癌细胞中转染miR-211 mimics或miR-211抑制剂以实现miR-211过表达或miR-211沉默,并检测miR-211过表达或沉默时TFAM蛋白质的表达水平;其次,构建了在TFAM的5'端有或无6对碱基突变的荧光酶报告基因质粒(mut-TFAM/wt-TFAM),与miR-211 mimics或miR-211抑制剂共转染后检测荧光酶活性变化;然后,构建pc DNA3.1/TFAM质粒,与miR-211 mimics或miR-211抑制剂共转染后检测TFAM蛋白质表达水平变化;最后,检测pc DNA3.1/TFAM和mimics NC/miR-211 mimics共转染后乳腺癌细胞增殖的增殖。结果miR-211过表达抑制TFAM蛋白质表达(P0.01),miR-211沉默促进TFAM蛋白质表达(P0.01);miR-211可靶向结合TFAM调控其表达;pc DNA3.1/TFAM可实现TFAM过表达(mRNA P0.01,蛋白质P0.01),并可恢复miR-211对TFAM的抑制作用;miR-211可抑制乳腺癌细胞的增殖和增殖(P0.05),TFAM可促进乳腺癌细胞增殖增殖(P0.01),TFAM可回复miR-211对乳腺癌细胞增殖增殖的抑制作用(P0.05)。结论 miR-211靶向TFAM基因抑制人乳腺癌细胞的增殖。