Knockdown of PVT1 inhibits IL-1β-induced injury in chondrocytes by regulating miR-27b-3p/TRAF3 axis

Long noncoding RNA plasmacytoma variant translocation 1 (PVT1) has been identified to implicate in the progression of osteoarthritis (OA). However, the mechanism underlying PVT1 in OA development remains largely unknown. This study aimed to investigate the effect of PVT1 on interleukin-1 beta (IL-1β)-induced injury in chondrocytes and explore potential mechanism. The cartilage tissues from 25 OA patients and normal controls were collected. Human transformed chondrocytes C28/I2 were stimulated by IL-1β. The levels of PVT1, microRNA (miR)-27b-3p, and tumor necrosis factor receptor-associated factor 3 (TRAF3) were detected by quantitative real-time polymerase chain reaction or western blot. IL-1β-induced injury was investigated by cell viability, apoptosis, autophagy and inflammatory response using 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide, flow cytometry, western blot and enzyme linked immunosorbent assay, respectively. The target association between miR-27b-3p and PVT1 or TRAF3 was explored by luciferase reporter, RNA immunoprecipitation and RNA pull-down assays. We found that PVT1 expression was enhanced in OA patients and IL-1β-treated C28/I2 cells. Silence of PVT1 promoted cell viability and autophagy but suppressed apoptosis and inflammatory response in IL-1β-treated C28/I2 cells. miR-27b-3p was confirmed as a target of PVT1 and its deficiency reversed the suppressive effect of PVT1 knockdown on IL-1β-induced injury. TRAF3 was a target of miR-27b-3p and attenuated the effect of miR-27b-3p on IL-1β-induced injury in C28/I2 cells. Moreover, TRAF3 expression was positively regulated by PVT1 via sponging miR-27b-3p. Collectively, knockdown of PVT1 increased cell viability and autophagy but inhibited apoptosis and inflammatory response in chondrocytes treated by IL-1β via up-regulating miR-27b-3p and down-regulating TRAF3.     

微小 RNA-216b-5p对骨肉瘤 MG63细胞功能的影响及其与高迁移率族蛋白 B1的靶向关系

目的 探讨微小RNA-216b-5p(miR-216b-5p)对骨肉瘤MG63细胞增殖、侵袭和凋亡的影响及其与高迁移率族蛋白B1(HMGB1)的靶向关系.方法 将体外培养的MG63细胞分为mimics-NC组、miR-216b-5p mimics组、inhibitor-NC组和miR-216b-5p inhibitor组,采用实时荧光定量PCR检测miR-216b-5p的表达,MTT法、Transwell小室和流式细胞仪分别检测细胞增殖、侵袭和凋亡能力.采用双荧光素酶报告基因实验检测miR-216b-5p和HMGB1的靶向关系,蛋白质印迹法(Western blot-ting)检测HMGB1蛋白的表达.结果 与mimics-NC组相比,miR-216b-5p mimics组细胞中miR-216b-5p的表达水平[(5.36±0.54)比(1.00±0.11)]和细胞凋亡率[(20.36±3.15)％比(8.58±1.22)％]明显升高,而细胞增殖活力、侵袭能力和细胞中HMGB1蛋白的表达水平均明显降低(P<0.05);miR-216b-5p inhibitor组细胞中miR-216b-5p的表达水平[(0.24±0.03)比(0.96±0.08)]和细胞凋亡率[(2.05±0.38)比(9.27±1.16)]较inhibitor-NC组明显降低,而细胞增殖活力、侵袭能力和HMGB1蛋白的表达水平较inhibitor-NC组均明显升高(P<0.05).双荧光素酶报告基因实验证实HMGB1是miR-216b-5p的靶基因.结论 miR-216b-5p可能通过靶向调控HMGB1表达,抑制骨肉瘤MG63细胞增殖、侵袭并诱导细胞凋亡.     

LncRNA Linc00152靶向miR-193a-3p对胃癌细胞增殖、侵袭和迁移的影响

目的 探讨LncRNA Linc00152靶向调控miR-193a-3p对胃癌细胞增殖、侵袭和迁移的影响。方法 采用qRT-PCR法检测正常胃黏膜细胞GES-1及4种胃癌细胞(MGC803、BGC803、SGC7901、AGS)中Linc00152的表达水平。MGC-803细胞分为pcDNA3.1-GFP-Linc00152组、pcDNA3.1-GFP组;AGS细胞分为si-Linc00152组、si-NC组,分别转染相应的Linc00152过表达和抑制载体。qRT-PCR法检测Linc00152、细胞周期素D1(cyclin D1,CCND1)和miR-193a-3p基因的表达水平,CCK-8检测细胞的活性,细胞克隆试验检测细胞的克隆能力,Annexin VFITC/PI染色后采用流式细胞术检测转染细胞凋亡率,Transwell法检测细胞侵袭,荧光素酶报告试验检测Linc00152和miR-193a-3p靶向关系,Western blotting检测Bcl-2、Bax、CCND1、E-钙黏蛋白(E-cadherin)和波形蛋白(Vimentin)的蛋白表达水平。并将si-Linc00152组、si-NC组细胞接种裸鼠,观察裸鼠体质量和一般状态,处死后称重记录肿瘤体积、质量,qRT-PCR法测定肿瘤组织Linc00152、CCND1和miR-193a-3p的表达水平。结果 与GES-1细胞相比,胃癌细胞MGC803、BGC803、SGC7901、AGS中Linc00152的表达升高,其中Linc00152在胃癌MGC803细胞中表达较低,而在胃癌AGS细胞中的表达较高,选用胃癌MGC803、AGS细胞进行后续试验。与pcDNA3.1-GFP组相比,pcDNA3.1-GFP-Linc00152组细胞的活性显著升高,克隆能力增强,细胞凋亡减少,侵袭能力显著上升,CCND1、Bcl-2、波形蛋白的表达显著升高,miR-193a-3p和E-钙黏蛋白的表达显著降低。双荧光素酶报告基因系统检测结果显示,Linc00152可直接调控miR-193a-3p的转录活性,且Linc00152可显著上调MGC-803细胞CCND1蛋白表达。与si-NC组相比,si-Linc00152组的裸鼠体内的异种移植瘤体积和体质量显著下降,CCND1和Linc00152的表达显著下降,miR-193a-3p的表达显著上升。结论 Linc00152可靶向作用于miR-193a-3p促进胃癌细胞增殖、侵袭和迁移,其作用机制与细胞周期、上皮细胞间充质转化以及细胞凋亡有关。     

微小 RNA-301b-3p靶向第 10号染色体缺失的磷酸酶及张力蛋白同源物对骨肉瘤细胞增殖、凋亡的影响

目的 探讨微小RNA-301b-3p(miR-301b-3p)对骨肉瘤细胞增殖、凋亡的影响及其作用机制.方法 本研究起止时间为2019年3—9月.人成骨细胞(hFOB)和骨肉瘤细胞U2OS、MG63购自美国菌种保藏中心.U2OS细胞分为miRNA抑制物阴性对照(anti-miR-NC)组、miR-301b-3p抑制物(anti-miR-301b-3p)组、anti-miR-301b-3p+小干扰RNA阴性对照(si-NC)组、anti-miR-301b-3p+第10号染色体缺失的磷酸酶及张力蛋白同源物(PTEN)小干扰RNA(si-PTEN)组;实时荧光定量PCR(RT-qP-CR)检测miR-301b-3p表达水平;四甲基偶氮唑盐比色法(MTT)检测细胞活性;流式细胞术检测细胞凋亡;双荧光素酶报告实验检测miR-301b-3p和PTEN的靶向关系.结果 与hFOB细胞相比,U2OS、MG63中miR-301b-3p表达水平[(0.89±0.09),(0.70±0.07)比(0.20±0.02)]显著升高.与anti-miR-NC组比较,anti-miR-301b-3p组U2OS细胞活性[(0.59±0.06)比(1.33±0.13)]显著降低,而凋亡率[(22.06±2.31)％比(7.48±0.78)％]、PTEN蛋白表达[(0.69±0.07)比(0.35±0.03)]显著升高.PTEN是miR-301b-3p的直接靶基因.与anti-miR-301b-3p+si-NC组比较,anti-miR-301b-3p+si-PTEN组U2OS细胞活性[(1.16±0.12)比(0.56±0.06)]显著升高,而凋亡率[(10.28±1.16)比(22.12±2.34)]显著降低.结论 抑制miR-301b-3p表达可通过调控PTEN抑制骨肉瘤细胞增殖,促进细胞凋亡.     

长链非编码前列腺癌相关转录因子 6靶向微小 RNA-139-3p对骨肉瘤细胞增殖和凋亡的影响

目的 探讨长链非编码RNA(LncRNA)前列腺癌相关转录因子6(PCAT6)对骨肉瘤细胞增殖和凋亡的影响和分子机制.方法 实时荧光定量PCR(RT-qPCR)检测20例骨肉瘤组织和与其对应的癌旁组织中PCAT6和微小RNA-139-3p(miR-139-3p)的表达水平.双荧光素酶报告基因实验和RT-qPCR验证PCAT6对miR-139-3p的靶向调控关系.将PCAT6小干扰RNA(si-PCAT6)、miR-139-3p模拟物(miR-139-3p mimics)分别转染骨肉瘤细胞SAOS2,细胞计数试剂盒(CCK-8)检测SAOS2细胞增殖活力,流式细胞术检测SAOS2细胞凋亡,蛋白质印迹法检测B细胞淋巴瘤/白血病-2(Bcl-2)、细胞周期素D1(Cyclin D1)、Bcl-2相关X蛋白(Bax)和P21、的表达水平.将si-PCAT6和miR-139-3p抑制物(anti-miR-139-3p)共转染至SAOS2细胞,采用上述方法检测细胞增殖、迁移侵袭能力以及凋亡变化.结果 与瘤旁组织相比,骨肉瘤组织中PCAT6的表达水平[(2.76±0.27)比(1.01±0.09)]显著升高,miR-139-3p的表达水平[(0.51±0.05)比(1.00±0.08)]显著降低(P<0.05).miR-139-3p是PCAT6的靶基因,PCAT6靶向负性调控miR-139-3p表达.抑制PCAT6表达或过表达miR-139-3p均可下调SAOS2细胞CyclinD1和Bcl-2蛋白表达,上调p21和Bax蛋白表达,降低细胞活力,促进细胞凋亡(P<0.05).抑制miR-139-3p表达可逆转si-PCAT6对骨肉瘤SAOS2细胞增殖抑制和凋亡的影响(P<0.05).结论 lncRNA PCAT6在骨肉瘤组织中表达上调,抑制miR-139-3p通过靶向miR-139-3p抑制骨肉瘤细胞增殖,诱导骨肉瘤细胞凋亡.     

miR-130b-3p靶向肝细胞生长因子调控妊娠滋养层细胞增殖、迁移和侵袭的机制研究

目的 研究miR-130b-3p靶向肝细胞生长因子(HGF)调控妊娠滋养层细胞增殖、迁移、侵袭的分子机制.方法 以实时荧光定量逆转录聚合酶链反应检测正常妊娠妇女胎盘组织和妊娠期子痫前期患者胎盘组织中miR-130b-3p的表达.分别建立抑制miR-130b-3p表达和过表达HGF的JEG-3细胞株,用噻唑蓝法检测细胞活...     

The long non-coding RNA maternally expressed 3-micorRNA-15a-5p axis is modulated by melatonin and prevents nucleus pulposus cell inflammation and apoptosis

Nucleus pulposus (NP) cell apoptosis is regarded as a critical risk factor for intervertebral disc degeneration (IVDD). Melatonin exerts a protective role on NP cells. The study concentrates on the role and mechanism of lncRNA MEG3 in melatonin-mediated effects on NP cells. An in vitro IVDD model was constructed using IL-1β on human NP cells. qRT-PCR investigated MEG3, miR-15a-5p and PGC-1α mRNA levels in tissues and NP cells. IL-1β-treated NP cells subsequent to transfection, followed by melatonin treatment. NP cell proliferation, viability, apoptosis and inflammatory reactions were assayed. Western blot checked the profiles of PGC-1α, SIRT1 and NF-κB p65. Student's t-test or one-way analysis of variance (ANOVA) followed by Tukey's test was used for statistical tests. As indicated by the data, melatonin weakened NP cell inflammation and apoptosis and enhanced MEG3 expression. MEG3 expression was attenuated in IVDD tissues. MEG3 knockdown impaired the function of melatonin, which was, however, strengthened by miR-15a-5p knockdown. MEG3 targeted miR-15a-5p, which targeted PGC-1α and repressed the PGC-1α/SIRT1 pathway. Collectively, this study has disclosed that the MEG3-miR-15a-5p-PGC-1α/SIRT1 pathway modulated by melatonin can hamper NP cell apoptosis and inflammation elicited by IL-1β.     

Suppression of the USP10/CCND1 axis induces glioblastoma cell apoptosis

Recent studies show that the expression of CCND1, a key factor in cell cycle control, is increased following the progress and deteriotation of glioma and predicts poor outcomes. On the other hand, dysregulated deubiquitinase USP10 also predicts poor prognosis for patients with glioblastoma (GBM). In the present study, we investigated the interplay between CCND1 protein and USP10 in GBM cells. We showed that the expression of CCND1 was significantly higher in both GBM tissues and GBM-derived stem cells. USP10 interacted with CCND1 and prevented its K48- but not K63-linked polyubiquitination in GBM U251 and HS683 cells, which led to increased CCND1 stability. Consistent with the action of USP10 on CCND1, knockdown of USP10 by single-guided RNA downregulated CCND1 and caused GBM cell cycle arrest at the G1 phase and induced GBM cell apoptosis. To implement this finding in the treatment of GBMs, we screened a natural product library and found that acevaltrate (AVT), an active component derived from the herbal plant Valeriana jatamansi Jones was strikingly potent to induce GBM cell apoptosis, which was confirmed by the Annexin V staining and activation of the apoptotic signals. Furthermore, we revealed that AVT concentration-dependently suppressed USP10-mediated deubiquitination on CCND1 therefore inducing CCND1 protein degradation. Collectively, the present study demonstrates that the USP10/CCND1 axis could be a promising therapeutic target for patients with GBMs.     

miR-1307-3p通过靶向ISM1促进乳腺癌细胞的增殖和迁移

目的 探讨miR-1307-3p通过靶向ISM1促进乳腺癌细胞增殖和迁移的分子机制。方法 （1）利用TCGA 数据库分析miR-1307-3p在乳腺癌患者中的表达水平及其与临床指标的关系。（2）利用qPCR、CCK-8实验、细胞划 痕实验和流式细胞术检测过表达或沉默miR-1307-3p后乳腺癌MCF-7细胞miR-1307-3p表达、细胞增殖、迁移和凋 亡水平变化。（3）生物信息学分析软件预测 miR-1307-3p 的靶基因,同时采用双荧光素酶实验进行验证。结果 miR-1307-3p在乳腺癌细胞及乳腺癌组织中均显著上调。miR-1307-3p过表达可促进MCF-7细胞增殖和迁移;而 miR-1307-3p inhibitor则抑制细胞迁移,并诱导凋亡。ISM1可能是miR-1307-3p的靶基因。乳腺癌组织中ISM1表 达水平明显低于正常乳腺组织,且与临床病理分期有关。 结论miR-1307-3p可促进乳腺癌细胞增殖和迁移,可能 通过调控ISM1基因而影响乳腺癌的发生发展。     

MiR-33b-5p sensitizes gastric cancer cells to chemotherapy drugs via inhibiting HMGA2 expression

MicroRNAs (miRNAs) are internal, non-coding, and ～22?nt small RNAs that display cell- and tissue-specific expression. They play important regulatory roles in cell proliferation and chemo-sensitivity. This study focused on tumor-suppressive miR-33b-5p expression as well as its role in gastric cancer. MiR-33b-5p was found low expression in gastric cancer cell lines. Functionally, western blots and the luciferase reporter assay were used to confirm that HMGA2 was the potential target of miR-33b-5p. Next, we used CCK-8 kits to analyze the effect of miR-33b-5p combined chemotherapy drugs on cell inhibition rate, and flow cytometry to analyze cells apoptosis. Colony formation ability was determined by plating at 500 cells per well into six-well plates and culturing for 15?d. The results showed that upregulation of miR-33b-5p decreased expression of HMGA2 and inhibited gastric cancer cell growth as well as sensitized gastric cancer cells to chemotherapy drugs. MiR-33b-5p overexpression hindered luciferase activity of HMGA2,3′-untranslated region-based reporter construct in 293?T cells. These data demonstrate that miR-33b-5p may be a potential therapeutic target for gastric cancer and function as tumor-suppressive miRNA through targeting HMGA2 in gastric cancer.     

长链非编码 RNA LINC00662靶向微小 RNA-103a-3p对黑色素瘤细胞增殖和周期的影响

目的探究长链非编码 RNA LINC00662对黑色素瘤细胞增殖和周期的影响,以及分子机制。方法本研究于 2018年 10月至 2020年 2月进行。以体外培养的人皮肤黑色素瘤细胞 A375为研究对象,然后将其分为四组,分别为 si-NC、si-LINC00662、si-LINC00662+anti-miR-NC和 si-LINC00662+anti-miR-103a-3p转染 A375细胞。采用 RT-PCR检测皮肤黑色素瘤组织中 LINC00662和 miR-103a-3p的表达水平, CCK-8法检测细胞增殖,流式细胞仪检测细胞周期,蛋白质印迹法( western blot. ting)检测细胞周期蛋白 1(CyclinD1)、增殖细胞核抗原( PCNA)的蛋白表达。结果与正常组织和正常皮肤细胞相比,在皮肤黑色素瘤组织和细胞株中 LINC00662表达［ 1.24±0.50比 4.17±1.27］上调, miR-103a-3p表达［ 1.17±0.32比 0.64±0.21］显著下调。 LINC00662与 miR-103a-3p靶向结合。与 si-NC组相比, si-LINC00662组 LINC00662表达［ 1.00±0.06比 0.48±0.06］、 OD值和 S期细胞比例［( 34.7±3.5)%比( 20.5±3.0)%］降低, G0/G1期细胞比例［( 57.4±5.2)%比( 74.7±4.8)%］增高, Cyclin D1［1.00±0.01比     

LncRNA MIAT靶向调节miR-128-3p对心房颤动大鼠心室重构和心肌纤维化的影响

目的 探讨保守的长链非编码RNA心肌梗死相关转录本（LncRNA MIAT）靶向调节miR-128-3p对心房颤动（AF）大鼠心室重构和心肌纤维化的影响。方法 通过舌下静脉注射氯化钙-乙酰胆碱混合液,诱导构建AF大鼠模型,以随机数字表法将其平均分为模型组、LncRNA MIAT siRNA质粒组（MIAT组）、miR-128-3p siRNA质粒组（miR-128-3p组）、LncRNA MIAT siRNA质粒+miR-128-3p siRNA质粒组（MIAT+miR-128-3p组）、空载质粒组,每组12只。另12只大鼠舌静脉注射等剂量生理盐水,作为对照组。分组干预处理后,检测大鼠心房肌电生理水平,比较各组有效不应期（ERP）和90%动作电位时程（APD90）;计算各组大鼠左心室质量指数;天狼星红染色检测大鼠心肌组织纤维化程度,比较各组心肌胶原容积分数（CVF）;使用试剂盒测量各组大鼠血清白细胞介素（IL）-18、IL-6、转化生长因子-β1(TGF-β1)水平;实时荧光定量PCR检测各组大鼠心肌组织miR-128-3p表达;双荧光素酶报告基因试验检测LncRNA MIAT对miR...     

基于miRNAs的知母水提物体外抑制胃癌细胞SGC7901增殖作用机制

目的 从微小核苷酸（miRNAs）的角度研究知母水提物（aqueous extract from Anemarrhenae Rhizoma,ARAE）体外抑制SGC7901细胞增殖的作用机制。方法 采用MTT法检测ARAE对SGC7901细胞增殖的影响;采用流式细胞术检测ARAE对SGC7901细胞凋亡的影响;采用高通量测序法检测细胞中miRNAs的表达丰度差异;采用miranda、mirbase和targetscan 3个数据库信息比对,预测差异miRNAs的靶基因,并通过KEGG分析靶基因的相关功能;采用实时荧光定量PCR法验证主要靶基因的表达变化。结果 ARAE能明显抑制SGC7901细胞的增殖并诱导其凋亡,调节细胞miR-16-5p、miR-20a-5p、miR-26b-5p和miR-15b-5p的表达水平;并提示这些miRNAs所调控的靶基因主要富集于PI3K-Akt、JAK-STAT和MAPK等信号通路。结论 ARAE可能通过调节SGC7901细胞内miRNAs的表达从而抑制SGC7901细胞增殖,并诱导其凋亡。     

MicroRNA-99b-3p promotes angiotensin II-induced cardiac fibrosis in mice by targeting GSK-3β

Cardiac fibrosis is a typical pathological change in various cardiovascular diseases. Although it has been recognized as a crucial risk factor responsible for heart failure, there is still a lack of effective treatment. Recent evidence shows that microRNAs (miRNAs) play an important role in the development of cardiac fibrosis and represent novel therapeutic targets. In this study we tried to identify the cardiac fibrosis-associated miRNA and elucidate its regulatory mechanisms in mice. Cardiac fibrosis was induced by infusion of angiotensin II (Ang II, 2 mg·kg⁻¹·d⁻¹) for 2 weeks via osmotic pumps. We showed that Ang II infusion induced cardiac disfunction and fibrosis accompanied by markedly increased expression level of miR-99b-3p in heart tissues. Upregulation of miR-99b-3p and fibrotic responses were also observed in cultured rat cardiac fibroblasts (CFs) treated with Ang II (100 nM) in vitro. Transfection with miR-99b-3p mimic resulted in the overproduction of fibronectin, collagen I, vimentin and α-SMA, and facilitated the proliferation and migration of CFs. On the contrary, transfection with specific miR-99b-3p inhibitor attenuated Ang II-induced fibrotic responses. Similarly, intravenous injection of specific miR-99b-3p antagomir could prevent Ang II-infused mice from cardiac dysfunction and fibrosis. We identified glycogen synthase kinase-3 beta (GSK-3β) as a direct target of miR-99b-3p. In CFs, miR-99b-3p mimic significantly reduced the expression of GSK-3β, leading to activation of its downstream profibrotic effector Smad3, whereas miR-99b-3p inhibitor caused anti-fibrotic effects. GSK-3β knockdown ameliorated the anti-fibrotic role of miR-99b-3p inhibitor. These results suggest that miR-99b-3p contributes to Ang II-induced cardiac fibrosis at least partially through GSK-3β. The modulation of miR-99b-3p may provide a new approach for tackling fibrosis-related cardiomyopathy.     

黄芩素对miR-183/Kif2a介导乳腺癌细胞增殖和凋亡的机制研究

目的探讨黄芩素对miR-183/Kif2a介导的乳腺癌MDA-MB-231细胞增殖和凋亡的作用及可能机制。方法噻唑蓝(methylthiazolyldiphenyl-tetrazolium bromide,MTT)法检测黄芩素对乳腺癌细胞增殖活性的影响,实时荧光定量聚合酶链式反应法检测细胞中miR-183和Kif2a信使RNA的表达,在线靶基因预测软件预测miR-183和Kif2a的靶向关系。转染miR-183抑制剂和pcDNA 3.1-Kif2a,黄芩素处理细胞后,MTT法检测细胞增殖活性,流式细胞术测定细胞凋亡,蛋白质免疫印记技术(western blot,WB)检测细胞中G1/S-特异性周期蛋白-D1(Cyclin D1)、p21、半胱氨酸天冬氨酸蛋白酶3(C-Caspase-3)及半胱氨酸天冬氨酸蛋白酶9(C-Caspase-9)蛋白表达。结果经黄芩素处理后的乳腺癌细胞增殖能力下降(P<0.05),细胞中miR-183水平升高(P<0.05),Kif2a信使RNA水平降低(P<0.05)。miR-183靶向结合Kif2a并负向调控Kif2a的表达(P<0.05)。miR-183抑制剂或pcDNA 3.1-Kif2a转染可以逆转黄芩素对乳腺癌增殖、凋亡以及C-Caspase-3、C-Caspase-9、Cyclin D1、p21蛋白表达的作用。结论黄芩素通过miR-183/Kif2a调控乳腺癌细胞增殖和凋亡。     

微RNA-182-5p激动剂和抑制剂对肝癌细胞增殖和迁移的影响

目的研究微RNA(miR)-182-5p激动剂和抑制剂对肝癌细胞增殖和迁移的影响。方法采用实时荧光定量-聚合酶链反应(RT-qPCR)和蛋白质印迹法检测非肝细胞癌(HCC)肝组织,HCC组织及邻近组织标本中miR-182-5p的表达水平以及RND3的mRNA/蛋白表达水平。建立患者来源的HCC细胞培养物,并进行miR-182-5p激动剂和抑制剂转染处理,以分别模拟miRNA的过表达和敲减。通过Transwell细胞侵袭实验监测体外HCC细胞的迁移。通过细胞活力和增殖评价体外HCC细胞的生长。结果与非HCC或邻近的HCC组织相比,HCC组织中的miR-182-5p明显上调,与RND3 mRNA表达呈负相关。使用miR-182-5p激动剂可显著降低HCC细胞中RND3 mRNA/蛋白质表达水平。通过荧光素酶试验和顺乌头酸酶2(AGO2)-RNA免疫沉淀分析,验证了miR-182-5p对RND3 mRNA具有靶向作用。MiR-182-5p激动剂可显著降低RND3表达,促进HCC细胞体外迁移和侵袭,可能是通过Rho相关卷曲螺旋蛋白激酶1(ROCK1)和ROCK2的抑制来实现。结论miR-182-5p可以通过靶向RND3来提高体外HCC细胞的迁移和增殖。使用miR-182-5p抑制剂,可以抑制体外肝癌细胞的迁移和增殖。     

长链非编码RNA LINC00662/微小RNA-16-5p/wee1信号通路对肝细胞癌细胞增殖及凋亡的作用研究

目的 探讨长链非编码RNA linc00662(LncRNA linc00662)通过微小RNA-16-5p(miR-16-5p)[/丝氨酸/苏氨酸蛋白激酶1(wee1)]信号轴在肝细胞癌（HCC）细胞增殖及凋亡中的作用。方法 该研究时间为2019年8月至2020年10月,体外培养正常肝细胞株LO2和肝癌细胞株SK-HEP-1、HepG2、Huh-7和Li-7。采用实时荧光定量聚合酶链反应（RT-PCR）检测细胞中linc00662、miR-16-5p和wee1的表达。以HepG2细胞作为研究对象,设置shRNA阴性对照（sh-NC）组、linc00662-shRNA干扰（sh-linc00662）组、抑制剂阴性对照（inhibitor-NC）组、miR-16-5p抑制剂（miR-16-5p inhibitor）组、siRNA阴性对照（si-NC）组、wee1-siRNA干扰（siwee1）组、linc00662-shRNA干扰联合miR-16-5p抑制剂（sh-linc00662+miR-16-5p inhibitor）组和miR-16-5p抑制剂联合wee1-siRNA干扰（miR...     

Polo-like kinase1 (Plk1) knockdown enhances cisplatin chemosensitivity via up-regulation of p73α in p53 mutant human epidermoid squamous carcinoma cells

Polo-like kinase 1 (Plk1), a critical regulator of mitotic entry, progression and exit, has been shown to be involved in a variety of cancers and thus is becoming an attractive target for cancer management. In case of DNA damage, Plk1 not only inhibits p53 independent apoptosis by dysfunctioning p73α but also allows cells to recover from growth arrest. Here, we showed the effects of knocking down plk1 gene through small interference RNA (siRNA) on cell cycle progression, proliferation and chemosensitivity of p53 mutant A431 cells to cisplatin (CDDP). The expression of Plk1 was measured by RT-PCR and Western blotting. Anti-proliferative response accompanied with cell cycle arrest in G(2)/M phase and induction of cell death was recorded following Plk1 knockdown. Furthermore, cells following knockdown of Plk1, which induced increase of Cyclin B1, p-Cdc2 and p73α with a decrease in p-Cdc25C, were more sensitive to CDDP. CDDP treatment induced nuclear translocation and co-localization of Plk1 with p73α whereas combination of CDDP and Plk1siRNA upregulated the expression of p73α protein in a synergistic manner thereby leading to an increase up to ∼5 folds in CDDP-induced cell death. The increase in caspase-3 activity indicated apoptosis as a contributor in the total cell death. Conclusively, plk1 gene silencing can enhance the sensitivity of A431 cells to low doses of CDDP by upregulating p73α expression and thus can be a revolutionary approach in cancer chemotherapy.