LncRNA KCNQ1OT1通过调控 miR-506-3p表达调节喉鳞状细胞癌细胞的生物学行为

目的 探讨长链非编码RNA(LncRNA)KCNQ1重叠转录物1(KCNQ1OT1)对喉鳞状细胞癌细胞生物学的影响及作用机制.方法 于2019年5月至2020年2月,采用RT-qPCR法检测了45例来自山东大学齐鲁医院桓台分院喉鳞状细胞癌病人的癌组织和癌旁组织及购自上海研生实业有限公司的人胚肺成纤维细胞WI-38和购自中国科学院上海细胞库的喉鳞状细胞癌细胞系(EV-SCC-18、AMC-HN-8和HCC345)中KCNQ1OT1和miR-506-3p表达.以HCC345细胞为研究对象,转染KCNQ1OT1小干扰RNA或共转染KCNQ1OT1小干扰RNA与miR-506-3p抑制剂至HCC345细胞后,MTT法、流式细胞术、Transwell分别检测细胞增殖、凋亡、迁移和侵袭.双荧光素酶报告基因实验验证KCNQ1OT1与miR-506-3p的调控关系.结果 喉鳞状细胞癌组织中KCNQ1OT1表达高于癌旁组织[(0.81±0.09)比(0.27±0.08)],miR-506-3p表达低于癌旁组织[(0.24±0.08)比(0.83±0.09)].喉鳞状细胞癌细胞系(EV-SCC-18、AMC-HN-8和HCC345)中KCNQ1OT1表达均高于WI-38细胞[(2.44±0.22)、(2.69±0.21)、(3.61±0.24)比(1.00±0.13)],miR-506-3p表达均低于WI-38细胞[(0.41±0.13)、(0.30±0.12)、(0.22±0.11)比(1.00±0.12)].与未敲减KCNQ1OT1的HCC345细胞比较,敲减KCNQ1OT1的HCC345细胞活力[(0.41±0.06)比(0.81±0.12)]、迁移数[(86.32±15.21)个比(162.31±20.23)个]和侵袭数[(65.23±12.05)个比(140.26±18.27)个]均降低,细胞凋亡率升高[(34.13±3.60)％比(3.79±2.37)％].KCNQ1OT1在HCC345细胞中负调控miR-506-3p表达.敲减miR-506-3p逆转敲减KCNQ1OT1对HCC345细胞增殖、凋亡、迁移和侵袭的影响.结论 KCNQ1OT1在喉鳞状细胞癌组织和细胞系中表达升高,其通过靶向miR-506-3p促进喉鳞状细胞癌细胞的恶性生物学行为.     

Evodiamine inhibits malignant progression of ovarian cancer cells by regulating lncRNA-NEAT1/miR-152-3p/CDK19 axis

Evodiamine (EVO) has been demonstrated to promote apoptosis of ovarian cancer cells, and upregulate miR-152-3p level in colorectal cancer. Here, we explore part of the network mechanism of EVO and miR-152-3p in ovarian cancer. The bioinformatics website, dual luciferase reporter assay, and quantitative real-time polymerase chain reaction were applied to analyze the network among EVO, lncRNA, miR-152-3p, and mRNA. The effect and mechanism of EVO on ovarian cancer cells were determined using cell counting kit-8, flow cytometry, TUNEL, Western blot, and rescue experiments. As a result, EVO dose-dependently attenuated cell viability, induced G2/M phase arrest and apoptosis, promoted miR-152-3p level (4.5- or 2-fold changes), and inhibited expressions of NEAT1 (0.225- or 0.367-fold changes), CDK8 (0.625- or 0.571-fold changes), and CDK19 (0.25- or 0.147-fold changes) in OVCAR-3 and SKOV-3 cells. In addition, EVO decreased Bcl-2 expression, but increased the expressions of Bax and c-caspase-3. NEAT1 targeted miR-152-3p which bound to CDK19. The impacts of EVO on cell viability, cycle, apoptosis, and apoptosis-related proteins were partially reversed by miR-152-3p inhibitor, NEAT1 overexpression, or CDK19 overexpression. Furthermore, miR-152-3p mimic offset the effects of NEAT1 or CDK19 overexpression. The role of NEAT1 overexpression in the biological phenotype of ovarian cancer cells was counteracted by shCDK19. In conclusion, EVO attenuates ovarian cancer cell progression via the NEAT1-miR-152-3p-CDK19 axis.     

Astragaloside IV suppresses development of hepatocellular carcinoma by regulating miR-150-5p/β-catenin axis

Hepatocellular carcinoma (HCC), a common malignant tumor, has been regarded as a leading cause of cancer-related deaths globally. Astragaloside IV (AS-IV) was reported to participate in the regulation of multiple tumors. However, the role of AS-IV in HCC was still unclear in HCC. Bioinformatics analysis and function or mechanism experiments including RT-qPCR, MTT assay, flow cytometry, Western blot, luciferase reporter assay and xenografts assays were applied to investigate the function of AS-IV, miR-150−5p and CTNNB1. We discovered that AS-IV treatment was supposed to significantly increase miR-150−5p level. In addition, AS-IV accelerated cell apoptosis by inducing miR-150−5p in vitro and in vivo. Furthermore, AS-IV increased cell apoptosis rate through reducing β-catenin level in vitro and in vivo. In detail, AS-IV triggered a decline of Bax and a rise of Bcl-2 in HCC cells and xenograft tissues. In mechanism, we validated the combination between miR-150−5p and CTNNB1. Moreover, miR-150−5p could negatively regulate CTNNB1 level by binding to its3’UTR. Finally, rescue assay demonstrated that CTNNB1 overexpression partially rescued the inhibitive effect on tumor growth and promotive influence on cell apoptosis caused by miR-150−5p amplification. The up-regulation of miR-150−5p induced by AS-IV suppressed the progression of HCC by repressing β-catenin, providing a new molecular target for the utilization of AS-IV In the treatment of HCC.     

长链非编码 RNA膀胱癌相关转录物 1对微小 RNA-503-5p的靶向关系及对结直肠癌细胞增殖和凋亡的影响

目的 研究长链非编码RNA(lncRNA)膀胱癌相关转录物1(BLACAT1)对微小RNA(miR)-503-5p的靶向关系及结直肠癌细胞增殖和凋亡的影响.方法 实时荧光定量PCR(qRT-PCR)检测结肠癌细胞株SW620,LOVO,HT29和人正常结肠黏膜上皮细胞株NCM460中BLACAT1和miR-503-5p的表达.在HT29细胞中转染si-BLACAT1、pcDNA-BLACAT1或miR-503-5p,噻唑蓝(MTT)检测细胞增殖,流式细胞术检测细胞凋亡,蛋白质印迹法(Western blotting)检测细胞核相关抗原Ki-67(Ki-67)、细胞周期蛋白D1(Cyclin D1)、活化的多聚ADP-核糖聚合酶(Cleaved PARP)和活化的含半胱氨酸的天冬氨酸蛋白水解酶-3(Cleaved caspase-3)的表达,starbase预测和双荧光素酶报告分析BLACAT1与miR-503-5p之间的靶向关系.si-BLACAT1和anti-miR-503-5p共转染,观察干扰miR-503-5p对沉默BLACAT1诱导的结直肠癌细胞增殖和凋亡的影响.结果 与NCM460细胞比较,SW620、LOVO和HT29中BLACAT1表达量明显增加[(4.93±0.58)、(5.66±0.53)、(6.17±0.66)比(1.03±0.22)],miR-503-5p表达量减少[(0.72±0.11)、(0.67±0.09)、(0.51±0.08)比(1.04±0.14)](P<0.05).沉默BLACAT1或转染miR-503-5p明显减少HT29细胞的细胞存活率、Ki-67、CyclinD1蛋白表达量,提高细胞凋亡率、Cleaved PARP和Cleaved caspase-3蛋白水平(P<0.05),过表达BLACAT1则反之.BLACAT1靶向miR-503-5p调控其表达.干扰miR-503-5p部分逆转沉默BLACAT1抑制结直肠癌细胞增殖、Ki-67、CyclinD1蛋白表达和诱导结直肠癌细胞凋亡、Cleaved PARP、Cleaved caspase-3蛋白表达的作用.结论 lncRNA BLA-CAT1在表达上调,沉默BLACAT1可通过靶向调控miR-503-5p的表达,来抑制结直肠癌细胞增殖,并诱导细胞凋亡.     

MiR-142-3p enhances chemosensitivity of breast cancer cells and inhibits autophagy by targeting HMGB1

MiR-142-3p has been reported to act as a tumor suppressor in breast cancer. However, the regulatory effect of miR-142-3p on drug resistance of breast cancer cells and its underlying mechanism remain unknown. Here, we found that miR-142-3p was significantly downregulated in the doxorubicin (DOX)-resistant MCF-7 cell line (MCF-7/DOX). MiR-142-3p overexpression increased DOX sensitivity and enhanced DOX-induced apoptosis in breast cancer cells. High-mobility group box 1 (HMGB1) is a direct functional target of miR-142-3p in breast cancer cells and miR-142-3p negatively regulated HMGB1 expression. Moreover, overexpression of HMGB1 dramatically reversed the promotion of apoptosis and inhibition of autophagy mediated by miR-142-3p up-regulation. In conclusion, miR-142-3p overexpression may inhibit autophagy and promote the drug sensitivity of breast cancer cells to DOX by targeting HMGB1. The miR-142-3p/HMGB1 axis might be a novel target to regulate the drug resistance of breast cancer patients.     

Melatonin promotes cardiomyocyte proliferation and heart repair in mice with myocardial infarction via miR-143-3p/Yap/Ctnnd1 signaling pathway

The neonatal heart possesses the ability to proliferate and the capacity to regenerate after injury; however, the mechanisms underlying these processes are not fully understood. Melatonin has been shown to protect the heart against myocardial injury through mitigating oxidative stress, reducing apoptosis, inhibiting mitochondrial fission, etc. In this study, we investigated whether melatonin regulated cardiomyocyte proliferation and promoted cardiac repair in mice with myocardial infarction (MI), which was induced by ligation of the left anterior descending coronary artery. We showed that melatonin administration significantly improved the cardiac functions accompanied by markedly enhanced cardiomyocyte proliferation in MI mice. In neonatal mouse cardiomyocytes, treatment with melatonin (1 μM) greatly suppressed miR-143-3p levels. Silencing of miR-143-3p stimulated cardiomyocytes to re-enter the cell cycle. On the contrary, overexpression of miR-143-3p inhibited the mitosis of cardiomyocytes and abrogated cardiomyocyte mitosis induced by exposure to melatonin. Moreover, Yap and Ctnnd1 were identified as the target genes of miR-143-3p. In cardiomyocytes, inhibition of miR-143-3p increased the protein expression of Yap and Ctnnd1. Melatonin treatment also enhanced Yap and Ctnnd1 protein levels. Furthermore, Yap siRNA and Ctnnd1 siRNA attenuated melatonin-induced cell cycle re-entry of cardiomyocytes. We showed that the effect of melatonin on cardiomyocyte proliferation and cardiac regeneration was impeded by the melatonin receptor inhibitor luzindole. Silencing miR-143-3p abrogated the inhibition of luzindole on cardiomyocyte proliferation. In addition, both MT1 and MT2 siRNA could cancel the beneficial effects of melatonin on cardiomyocyte proliferation. Collectively, the results suggest that melatonin induces cardiomyocyte proliferation and heart regeneration after MI by regulating the miR-143-3p/Yap/Ctnnd1 signaling pathway, providing a new therapeutic strategy for cardiac regeneration.     

MicroRNA-378-3p/5p represses proliferation and induces apoptosis of oral squamous carcinoma cells via targeting KLK4

Oral squamous cell carcinoma (OSCC) is one of the most common types of head and neck neoplasm. Down-regulation of hsa-microRNA-378 (miR-378) has been proved in OSCC tissues, suggesting that miR-378 might play crucial roles in the progression of OSCC. The present study aimed to evaluate the effect of miR-378-3p/5p on the proliferation and apoptosis of OSCC in vitro and in vivo. According to the results, lentivirus-mediated overexpression of miR-378 lowered the colony formation efficiency, blocked cell cycle progression, and decreased the percentage of Ki-67 positive cells, whereas knockdown of miR-378-3p/5p led to the opposite results. Furthermore, the apoptosis of OSCC cells was induced by the overexpression of miR-378 as evidenced by decreasing Bcl-2/Bax ratio, increasing cleaved caspase-9, cleaved caspase-3, and cleaved PARP levels, and promoting the release of cytochrome c into the cytoplasm. However, the above results were reversed by miR-378-3p/5p silencing. In addition, the overexpression of miR-378 inhibited the activation of PI3K/AKT signalling pathway. Conversely, miR-378-3p/5p knockdown resulted in the inactivation of PI3K/AKT signalling pathway. Mechanically, we validated that miR-378-3p/5p could target kallikrein-related peptidase 4 (KLK4), and enforced overexpression of KLK4 counteracted miR-378 overexpression-induced apoptosis. Finally, tumourigenesis in nude mice was suppressed by the overexpression of miR-378, which was promoted by miR-378-3p/5p silencing. Taken together, these results suggest that miR-378 may be a potential target in the diagnoses and treatment of OSCC.     

LncRNA-MALAT1通过miR-142-3p/TEAD1分子轴调控结直肠癌细胞增殖与凋亡#br#

目的　探讨长链非编码RNA-肺腺癌转移相关转录子1（LncRNA-MALAT1）对结直肠癌细胞增殖与凋亡的影响及相关作用机制。方法　通过Real-time PCR与Western blot实验检测结直肠癌细胞株与人正常结肠上皮细胞中LncRNA-MALAT1、miR-142-3p基因以及TEA结构域转录因子1（TEAD1）蛋白的表达;使用si-MALAT1转染HCT116细胞,在此基础上共转染miR-142-3p inhibitor,利用Real-time PCR与Western blot检测细胞中LncRNA-MALAT1与miR-142-3p基因以及TEAD1、Bax、Bcl-2与Cyclin D1蛋白的表达,通过CCK-8实验检测细胞的增殖水平,通过流式细胞术检测细胞的凋亡水平,通过双荧光素酶实验检测LncRNA-MALAT1与miR-142-3p以及miR-142-3p与TEAD1的结合。结果　与人正常结肠上皮细胞相比,结直肠癌细胞株中LncRNA-MALAT1基因与TEAD1蛋白呈高表达,miR-142-3p基因呈低表达（P＜0.05）;沉默LncRNA-MALAT1能够促进miR-142-3p基因与Bax蛋白表达,抑制LncRNA-MALAT1基因以及Bcl-2、Cyclin D1与TEAD1蛋白表达,抑制细胞增殖,并促进细胞凋亡;在此基础上沉默miR-142-3p能够对上述调控作用实现部分逆转;双荧光素酶实验结果显示,LncRNA-MALAT1与miR-142-3p以及miR-142-3p与TEAD1能够结合。结论　LncRNA-MALAT1能够结合miR-142-3p,促进miR-142-3p靶基因TEAD1表达,进而促进结直肠癌细胞增殖,抑制其细胞凋亡,促进结直肠癌的病理进程。     

Rhein attenuates renal inflammatory injury of uric acid nephropathy via lincRNA-Cox2/miR-150-5p/STAT1 axis

Rhein has protective effect on uric acid nephropathy (UAN). This article aims to demystify the mechanism of function of rhein in UAN. Mouse kidney epithelial cell line (TCMK-1) was incubated with uric acid (UA) to induce inflammatory injury. Then, the TCMK-1 cells were treated with rhein. The relationships among lincRNA-Cox2, miR-150-5p and STAT1 were evaluated by luciferase reporter assay. CCK8 and flow cytometry were performed to detect cell proliferation and apoptosis. The levels of IL-6, IL-1β and TNF-α were investigated by enzyme linked immunosorbent assay. Western blot and quantitative real-time PCR were performed to examine the expression of genes and proteins. We found that UA suppressed proliferation and enhanced apoptosis and the levels of IL-6, IL-1β and TNF-α of TCMK-1 cells, which was effectively improved by rhein treatment. Furthermore, lincRNA-Cox2 overexpression caused an increase of apoptosis and inflammatory factors in the rhein-treated TCMK-1 cells. LincRNA-Cox2 regulated STAT1 expression by sponging miR-150-5p. And lincRNA-Cox2 promoted apoptosis and inflammatory injury of TCMK-1 cells by regulating miR-150-5p/STAT1 axis. In summary, our studies demonstrate that rhein has a protective effect against UAN by inhibiting renal inflammatory injury via lincRNA-Cox2/miR-150-5p/STAT1 axis.     

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-599 regulates LPS-mediated apoptosis and inflammatory responses through the JAK2/STAT3 signalling pathway via targeting ROCK1 in human umbilical vein endothelial cells

MicroRNA plays an integral role in the development of atherosclerosis. Our study aimed to investigate the roles of miR-599 in lipopolysaccharide (LPS)-induced endothelial damage in human umbilical vein endothelial cells (HUVECs). HUVECs were transfected with a miR-599 mimic and negative control, and then exposed to LPS. The expression of miR-599 was detected by quantitative real time-polymerase chain reaction (RT-qPCR). Cell viability was analyzed by CCK-8 assay and trypan blue exclusion assay; the formation of DNA fragments was tested by Cell Death Detection ELISA Plus kit; the incidence of apoptosis was detected by flow cytometry; the expression of p53 and cleaved-caspase 3 (c-caspase 3) was evaluated by western blot. Moreover, the mRNA levels and concentrations of tumour necrosis factor (TNF)-α, interleukin (IL)-6, ICAM-1 and VCAM-1 were assayed by RT-qPCR and ELISA. The results showed that overexpression of miR-599 increased cell viability, reduced DNA fragments, the incidence of apoptosis, as well as the protein levels of p53 and c-caspase 3 in the presence of LPS. TNF-α, IL-6, ICAM-1 and VCAM-1 mRNA levels and concentrations were also decreased upon miR-599 upregulation. In addition, the dual luciferase reporter assay demonstrated that ROCK1 is a direct target of miR-599. MiR-599 overexpression inhibited ROCK1 expression. Induced expression of ROCK1 reversed the roles of miR-599 in apoptosis and inflammation. The gain function of miR-599 function inhibited activation of the JAK2/STAT3 signalling pathway, which was abrogated by overexpression of ROCK1. Taken together, our results indicate that miR-599 attenuates LPS-caused cell apoptosis and inflammatory responses through the JAK2/STAT3 signalling pathway via targeting ROCK1.     

Mesenchymal stem cell-originated exosomal circDIDO1 suppresses hepatic stellate cell activation by miR-141-3p/PTEN/AKT pathway in human liver fibrosis

Liver fibrosis is a common pathologic stage of the development of liver failure. It has showed that exosomes loaded with therapeutic circRNAs can be manufactured in bulk by exosome secreted cells in vitro, thus enabling personalized treatment. This study aimed to investigate the role of exosome-based delivery of circDIDO1 in liver fibrosis. Levels of genes and proteins were examined by qRT-PCR and Western blot. Cell proliferation, apoptosis, and cell cycle were analyzed by using cell counting kit-8 (CCK-8) assay, EdU assay, and flow cytometry, respectively. The binding between circDIDO1 and miR-141-3p was confirmed by dual-luciferase reporter, RNA pull-down and RIP assays. Exosomes were isolated by ultracentrifugation, and qualified by transmission electron microscopy (TEM), nanoparticle tracking analysis (NTA) and Western blot. CircDIDO1 overexpression or miR-141-3p inhibition suppressed the proliferation, reduced pro-fibrotic markers, and induced apoptosis as well as cell cycle arrest in hepatic stellate cells (HSCs) by blocking PTEN/AKT pathway. Mechanistically, circDIDO1 acted as an endogenous sponge for miR-141-3p, further rescue experiments showed that circDIDO1 suppressed HSC activation by targeting miR-141-3p. Extracellular circDIDO1 could be incorporated into exosomes isolated from mesenchymal stem cells (MSCs), and transmitted to HSCs to restrain HSC activation. Clinically, low levels of serum circDIDO1 in exosome were correlated with liver failure, and serum exosomal circDIDO1 had a well diagnostic value for liver fibrosis in liver failure patients. Transfer of circDIDO1 mediated by MSC-isolated exosomes suppressed HSC activation through the miR-141-3p/PTEN/AKT pathway, gaining a new insight into the prevention of liver fibrosis in liver failure patients.     

Paeoniflorin inhibits VSMCs proliferation and migration by arresting cell cycle and activating HO-1 through MAPKs and NF-κB pathway

The proliferation, migration and inflammation of vascular smooth muscle cells (VSMCs) contributes to the pathogenesis and progression of atherosclerosis. Paeoniflorin (PF) as active compound in the Rhizoma Atractylodes macrocephala has been used for various diseases like cancer, splenic asthenia, anaphylaxis and anorexia. This study aimed to explore whether and how PF regulated the inflammation, proliferation and migration of VSMCs under ox-LDL stimulation. Here, we found that PF dose-dependently inhibited ox-LDL-induced VSMCs proliferation and migration, and decreased inflammatory cytokines and chemokine overexpression. Mechanistically, PF prevented p38, ERK1/2 and NF-κB phosphorylation, and arrested cell cycle in S phase. Meanwhile, PF regulated the HO-1 and PCNA expression. Furthermore, PF blocked the foam cell formation in macrophages induced by ox-LDL. These results indicate that PF antagonizes the ox-LDL-induced VSMCs proliferation, migration and inflammation through activation of HO-1, cell cycle arrest and then suppression of p38, ERK1/2/MAPK and NF-κB signaling pathways.     

Cl~-通道在内皮素-1引起的血管平滑肌细胞增殖中的作用

目的　研究Cl-通道在内皮素 1(endothelin 1,ET 1)引起的血管平滑肌细胞增殖中的作用 ,并探讨其可能的作用机制。方法　通过细胞计数和3H TdR参入实验 ,并结合fura 2 /AM荧光测定胞浆游离Ca2 + 浓度 ([Ca2 + ]i)等技术 ,观察了Cl-通道阻断剂对ET 1引起的 [Ca2 + ]i 变化及血管平滑肌细胞增殖的影响。结果　Cl-通道阻断剂DIDS可呈浓度依赖性地抑制 10nmol·L-1ET 1引起的血管平滑肌细胞增殖 ,其它Cl-通道阻断剂如IAA 94、NPPB、SITS、DPC和速尿均无此作用 ,DIDS也能抑制 10nmol·L-1ET 1引起的内流相 [Ca2 + ]i 升高 ,而对ET 1引起的Ca2 + 释放无影响 ;预先将细胞与 1μmol·L-1nifedipine作用后 ,3μmol·L-1DIDS对 10nmol·L-1ET 1引起的内流相 [Ca2 + ]i 升高及血管平滑肌细胞增殖不再有效 ,将细胞与 10 μmol·L-1SK&F96 36 5预孵后 ,DIDS却能进一步抑制ET 1的上述作用 ;3μmol·L-1DIDS对 30mmol·L-1KCl引起的胞浆[Ca2 + ]i升高无影响。结论　DIDS可通过阻断Cl-通道来抑制ET 1因促发Cl-通道开放经电压依赖性钙通道的Ca2 +内流及细胞增殖 ,DIDS敏感的Cl-通道可能在ET 1促发的Ca2 + 内流及血管平滑肌细胞增殖的调控上都起着重要的作用     

LncRNA ITGB2-AS1靶向miR-338-3p对肺癌细胞多西他赛耐药性的影响

目的 研究lncRNA ITGB2-AS1对肺癌细胞增殖、凋亡及多西他赛耐药性的影响及潜在的分子机制.方法 用不同浓度(6.25μg/L、12.5μg/L、25μg/L、50μg/L、100μg/L、200μg/L)多西他赛(DTX)处理肺癌A549和多西他赛耐药细胞A549/DTX细胞,CCK8法测定DTX对A549...     

miR-142-3p靶向HMGB1逆转乳腺癌细胞MCF-7对阿霉素的耐药性

目的化疗耐药是乳腺癌复发转移、治疗效果不理想的主要因素。本文探讨miR-142-3p通过靶向高迁移率族蛋白1(high-mobility group box 1,HMGB1)提高乳腺癌化疗敏感性的分子机制。方法实时荧光定量PCR检测人乳腺癌MCF-7细胞及阿霉素耐药株MCF-7/DOX细胞中的miR-142-3p水平;MTT法检测阿霉素(doxorubicin,DOX)处理后各组的增殖情况、流式细胞术检测凋亡率、Western blot检测HMGB1和自噬有关蛋白的表达水平;双荧光素酶报告实验评价miR-142-3p对HMGB1的靶向调控作用。结果阿霉素耐药株MCF-7/DOX细胞中的miR-142-3p水平明显下调。miR142-3p的过度表达增强了乳腺癌细胞对阿霉素的敏感性和提高阿霉素诱导的凋亡比率。HMGB1是乳腺癌细胞中miR-142-3p的直接功能靶点,HMGB1的过表达可以明显解除由miR-142-3p上调所产生的细胞凋亡和自噬抑制。结论miR-142-3p的过表达可能通过抑制自噬靶向HMGB1,增强乳腺癌细胞对阿霉素的化学敏感性。miR-142-3p/HMGB1为提高乳腺癌对药物的敏感性提供了新的靶点,具有一定价值。     

微RNA-132-3p靶向第10号染色体缺失的磷酸酶和张力蛋白同源物调控葡萄膜黑色素瘤细胞增殖与凋亡

目的 研究微RNA(miR)-132-3p在葡萄膜黑色素瘤细胞增殖、凋亡中的作用及其作用机制。方法 该研究起止时间为2018年2月至2019年7月。定量聚合酶链反应（qPCR）检测正常葡萄膜上皮细胞ARPE-19和葡萄膜黑色素瘤细胞SP6.5、M23中miR-132-3p表达。SP6.5细胞中转染miR-132-3p干扰质粒（anti-miR-132-3p）、第10号染色体上缺失的磷酸酶和张力蛋白同源物（PTEN）过表达质粒（pcDNA3.1-PTEN）或共转染anti-miR-132-3p和PTEN干扰质粒（si-PTEN）,MTT法和流式细胞术分别检测细胞增殖与凋亡,蛋白质印迹法检测PTEN、细胞周期蛋白D1(cyclin D1)、周期素依赖激酶抑制剂p21(P21)、B细胞淋巴瘤-2(Bcl-2)和Bcl-2相关X蛋白（Bax）蛋白表达,生物信息学预测结合双萤光素酶报告实验分析miR-132-3p与PTEN的靶向关系。结果 与ARPE-19细胞相比,SP6.5、M23细胞中miR-132-3p表达量（0.26±0.02比0.94±0.09、0.81±0.08）明显升高（P<...     

过表达微小 RNA-877-5p通过靶向叉头框转录因子 M1调控胃癌细胞活力和凋亡

目的探讨微小 RNA-877-5p(miR-877-5p)对胃癌细胞活力、凋亡的影响及其分子机制。方法本研究时间为 2020年 1—7月。胃癌和正常胃黏膜上皮细胞株购自美国典型培养物保藏中心。实时定量基因扩增荧光检测( qPCR)检测胃癌细胞株 HGC-27、SUN-1、AGS和正常胃黏膜上皮细胞株 GES-1中 miR-877-5p和叉头框转录因子 M1(FOXM1)信使核糖核酸( mRNA)表达。建立 miR-877-5p过表达或抑制 FOXM1表达细胞株,观察其在 HGC-27细胞的活力、凋亡中的作用。 MTT法检测细胞的活力,流式细胞术检测细胞凋亡,蛋白质印迹法( Western blotting)检测 FOXM1、细胞周期蛋白 D1(cyclinD1)、细胞周期依赖性激酶抑制因子 p21、p27、B细胞淋巴瘤 /白血病 -2(Bcl-2)、 Bcl-2相关 X蛋白( Bax)、活化的含半胱氨酸的天冬氨酸蛋白水解酶 3(cleaved-caspase 3)蛋白表达。 TargetScan预测结合双荧光素酶报告实验分析 miR-877-5p和 FOXM1的靶向关系。共转染 miR-877-5p模拟物和 FOXM1过表达载体( pcDNA-FOXM1),研究 FOXM1过表达对 miR-877-5p过表达诱导的 HGC-27细胞增殖和凋亡的影响。结果与正常胃黏膜上皮细胞 GES-1比较,胃癌细胞 HGC-27、SUN-1、AGS中的 miR-877-5p表达下调( 1.00±0.08比 0.34±0.03,0.51±0.05,0.44±0.04,P<0.05)FOXM1 mRNA和蛋白表达上调( 1.00±0.09比 2.41±0.23,2.58±0.24,2.26±0.23,P< 0.05)。 miR-877-5p过表达显著降低 HGC-27细,胞 48 h、72 h的细胞活力( P<0.05),明显提高细胞凋亡率、 p21、p27、Bax、cleaved-caspase3蛋白的水平( P<0.05)显著减少 cyclinD1、Bcl-2蛋白表达量( P<0.05)。抑制 FOXM1表达显著降低 48 h、72 h的细胞活力( P<0.05)提高细胞凋亡率、 p,21、Bax蛋白水平( P<0.05),减少 cyclinD1、Bcl-2蛋白表达量( P<0.05)。 miR-877-5p靶向调控 FOXM1的表达,。FOXM1过表达后, miR-877-5p过表达对 HGC-27细胞增殖、 cyclinD1、Bcl-2蛋白表达的抑制作用被逆转,其对细胞凋亡、 p21、Bax蛋白表达的促进作用也被逆转。结论过表达 miR-877-5p通过靶向调控 FOXM1表达抑制胃癌细胞的活