MicroRNA-145 inhibits tumour growth and metastasis in colorectal cancer by targeting fascin-1

Background:

Recent studies have reported miR-145 dysregulated in colorectal cancer (CRC). In this study, miR-145 profiles were compared between CRC and corresponding non-tumour tissues.

Methods:

The expression levels of miR-145 were analysed in CRC cell lines and tumour tissues by real-time PCR. A luciferase reporter assay confirmed direct targets. The functional effects of miR-145 were examined in transfected CRC cells in vitro and in vivo using established assays.

Results:

Downregulation of miR-145 was detected in most primary CRC tumours, and was significantly correlated with a more aggressive phenotype of CRC in patients. In CRC cell lines, ectopic overexpression of miR-145 inhibited cell proliferation, motility and invasion in vitro. Stable overexpression of miR-145 suppressed tumour growth and pulmonary metastasis in vivo. Further studies indicated that miR-145 may directly interact with the 3′-untranslated region (3′-UTR) of Fascin-1 messenger RNA (mRNA), downregulating its mRNA and protein expression levels. In clinical specimens, Fascin-1 expression was negatively correlated with miR-145 expression.

Conclusions:

MiR-145 has a critical role in the inhibition of invasive and metastatic capacities of CRC, probably through directly targeting Fascin-1. This miRNA may be involved in the development and progression of CRC.     

miR-145在浆液性卵巢癌中的表达及对卵巢癌SKOV3细胞增殖的影响

目的:检测miR-145在浆液性卵巢癌组织及卵巢癌SKOV3细胞中的表达情况,探讨其对卵巢癌SKOV3细胞增殖的影响及其可能的分子机制。方法:利用实时定量PCR技术检测43组浆液性卵巢癌患者癌及癌旁组织中miR-145的表达情况;利用实时定量PCR技术检测正常卵巢浆液腺细胞及SKOV3细胞中miR-145的表达情况;合成miR-145的模拟物miR-145 agomir,将该模拟物及对照分别转染入SKOV3细胞中,应用MTT法检测细胞增殖情况,明确miR-145对卵巢癌SKOV3细胞增殖的影响。结果:实时定量PCR结果显示,与癌旁组织相比,miR-145在浆液性卵巢癌患者癌组织中表达含量降低;与正常细胞相比,miR-145在SKOV3细胞中表达含量降低; MTT结果表明转染了miR-145 angomir的SKOV3细胞增殖受到明显的抑制。结论:miR-145在浆液性卵巢癌组织及SKOV3细胞中均表达含量降低,miR-145可以抑制卵巢癌细胞增殖,miR-145与卵巢癌患者预后密切相关,其含量增高提示好的预后,有望成为新的生物学标志物用于卵巢癌早期诊断及判断预后。     

miR-145通过靶向抑制SMAD3的表达抑制非小细胞肺癌细胞侵袭能力

目的:探讨miR-145靶向调控SMAD3的表达对非小细胞肺癌细胞侵袭能力的影响。方法:采用qRT-PCR检测miR-145和SMAD3在30例非小细胞肺癌组织和癌旁组织中的表达水平并分析其相关性。利用靶基因预测网站预测miR-145的潜在靶基因SMAD3,利用双荧光素酶报告基因实验验证。利用细胞转染实验对非小细胞肺癌A549细胞进行了miR-145 mimics、miR-145 inhibitor、siRNA SMAD3及其相关对照的细胞转染,采用Transwell实验检测转染后A549细胞侵袭能力的变化。使用Western blot检测上调或下调miR-145表达对A549细胞中SMAD3蛋白表达的影响。结果:qRT-PCR结果显示,非小细胞肺癌组织中miR-145低表达,SMAD3高表达,且两者表达水平呈负相关。靶基因预测及验证实验结果显示miR-145可以与SMAD3 的 3'-UTR特异性结合,SMAD3是miR-145的靶基因。Western blot 结果显示,转染miR-145 mimics可以显著降低SMAD3蛋白的表达水平（P<0.001）,转染miR-145 inhibitor则显著提高SMAD3蛋白的表达水平（P<0.01）。Transwell体外侵袭实验结果显示,与对照组相比,转染miR-145 mimic显著降低了A549细胞的侵袭能力（P<0.001）,转染miR-145 inhibitor显著提高了A549细胞的侵袭能力（P<0.05）;与对照组相比,敲低SMAD3的表达A549细胞的侵袭能力减弱（P<0.001）;与单独敲低SMAD3相比,共同转染siRNA SMAD3和miR-145 mimics A549细胞的侵袭能力减弱（P<0.05）,共同转染siRNA SMAD3和miR-145 inhibitor A549细胞的侵袭能力无显著差异（P>0.05）。结论:miR-145在非小细胞肺癌组织中低表达,miR-145通过靶向抑制SMAD3的表达发挥对非小细胞肺癌细胞侵袭能力的抑制作用,为临床综合治疗提供了新的作用靶点。     

Extracellular microRNA profiling for prognostic prediction in patients with high-grade serous ovarian carcinoma

High-grade serous ovarian carcinoma is a leading cause of death in female patients worldwide. MicroRNAs (miRNAs) are stable noncoding RNAs in the peripheral blood that reflect a patient’s condition, and therefore, they have received substantial attention as noninvasive biomarkers in various diseases. We previously reported the usefulness of serum miRNAs as diagnostic biomarkers. Here, we investigated the prognostic impact of the serum miRNA profile. We used the GSE106817 dataset, which included preoperative miRNA profiles of patients with ovarian malignancies. Excluding patients with other malignancy or insufficient prognostic information, we included 175 patients with high-grade serous ovarian carcinoma. All patients except four underwent surgery and received chemotherapy as initial treatment. The median follow-up period was 54.6 months (range, 3.5-144.1 months). Univariate Cox regression analysis revealed that higher levels of miR-187-5p and miR-6870-5p were associated with both poorer progression-free survival (PFS) and overall survival (OS), and miR-1908-5p, miR-6727-5p, and miR-6850-5p were poor prognostic indicators of PFS. The OS and PFS prognostic indices were then calculated using the expression values of three prognostic miRNAs. Multivariate Cox regression analysis showed that both indices were significantly independent poor prognostic factors (hazard ratio for OS and PFS, 2.343 [P = .015] and 2.357 [P = .005], respectively). In conclusion, circulating miRNA profiles can potentially provide information to predict the prognosis of patients with high-grade serous ovarian carcinoma. Therefore, there is a strong demand for early clinical application of circulating miRNAs as noninvasive biomarkers.     

Exosome-delivered miR-221/222 exacerbates tumor liver metastasis by targeting SPINT1 in colorectal cancer

MicroRNAs (miRNAs) are involved in the progression of many cancers through largely unelucidated mechanisms. The results of our present study identified a gene cluster, miR-221/222, that is constitutively upregulated in serum exosome samples of patients with colorectal carcinoma (CRC) with liver metastasis (LM); this upregulation predicts a poor overall survival rate. Using an in vitro cell coculture model, we demonstrated that CRC exosomes harboring miR-221/222 activate liver hepatocyte growth factor (HGF) by suppressing SPINT1 expression. Importantly, miR-221/222 plays a key role in forming a favorable premetastatic niche (PMN) that leads to the aggressive nature of CRC, which was further shown through in vivo studies. Overall, our results show that exosomal miR-221/222 promotes CRC progression and may serve as a novel prognostic marker and therapeutic target for CRC with LM.     

Expression levels of microRNA-145 and microRNA-10b are associated with metastasis in non-small cell lung cancer

Although metastasis remains the overwhelming cause of death for patients with non-small cell lung cancer (NSCLC), the underlying mechanisms of metastasis remain unknown. Accumulating evidence suggests that microRNAs (miRNAs) are key players in the regulation of tumor cell invasion and metastasis. Expression of miR-9, miR-10b, miR-145, and miR-155, 4 miRNAs previously shown to play roles in metastasis in other tumor types, was compared in lymph node (LN)-positive NSCLC versus LN-negative NSCLC. Expression of miR-145 was significantly lower in LN-positive NSCLC (P < 0.05), while expression of miR-10b was significantly higher (P < 0.05). Expression of both miR-145 and miR-10b was correlated with lymph node metastasis in NSCLC (both Ps < 0.001). In addition, miR-10b facilitated the migration and invasion of lung cancer cell line A549, while miR-145 suppressed the migration and invasion capacity of A549 in vitro. These results suggest that miR-10b and miR-145 may act as an oncogene or tumor suppressor gene, respectively, in NSCLC metastasis.     

miR-188-5p inhibits tumour growth and metastasis in prostate cancer by repressing LAPTM4B expression

Elucidation of the molecular targets and pathways regulated by the tumour-suppressive miRNAs can shed light on the oncogenic and metastatic processes in prostate cancer (PCa). Using miRNA profiling analysis, we find that miR-188-5p was significantly down-regulated in metastatic PCa. Down-regulation of miR-188-5p is an independent prognostic factor for poor overall and biochemical recurrence-free survival. Restoration of miR-188-5p in PCa cells (PC-3 and LNCaP) significantly suppresses proliferation, migration and invasion in vitro and inhibits tumour growth and metastasis in vivo. We also find overexpression of miR-188-5p in PC-3 cells can significantly enhance the cells'' chemosensitivity to adriamycin. LAPTM4B is subsequently identified as a direct target of miR-188-5p in PCa, and is found to be significantly over-expressed in PCa. Knockdown of LAPTM4B phenotypically copies miR-188-5p-induced phenotypes, whereas ectopic expression of LAPTM4B reverses the effects of miR-188-5p. We also find that restoration of miR-188-5p can inhibit the PI3K/AKT signaling pathway via the suppression of LAPTM4B. Taken together, this is the first report unveils that miR-188-5p acts as a tumour suppressor in PCa and may therefore serve as a useful therapeutic target for the development of new anticancer therapy.     

CircPVT1 promotes progression in clear cell renal cell carcinoma by sponging miR-145-5p and regulating TBX15 expression

Emerging evidence revealed that circular RNAs (circRNAs) play significant roles in regulating tumorigenesis and cancer progression. However, few circRNAs were well characterized in clear cell renal cell carcinoma (ccRCC). We found that circPVT1 was significantly upregulated in ccRCC tissues and positively associated with the clinical stage. The Area Under Curve of tissue and serum circPVT1 expression in ccRCC were 0.93 and 0.86, respectively. Importantly, we demonstrated that circPVT1 promoted ccRCC growth and metastasis in vitro and in vivo. We also found that circPVT1 directly binds to miRNA-145-5p via the Biotin-labelled miRNA pulldown assay and dual-luciferase reporter assay, and miR-145-5p inhibitor significantly attenuated the effect of circPVT1 knockdown on ccRCC cells. Moreover, through RNA sequencing and bioinformatics analysis, we demonstrated that TBX15 was regulated by the circPVT1/miR-145-5p axis and predicted poor prognosis in ccRCC. These findings suggest that circPVT1 promotes ccRCC growth and metastasis through sponging miR-145-5p and regulating downstream target TBX15 expression. The circPVT1/miR-145-5p/TBX15 axis might be a potential diagnostic marker and therapeutic target in ccRCC.     

miR-22通过靶向MTDH抑制胶质瘤细胞的生长

背景与目的：miR-22在胃癌、肺癌、结肠癌以及乳腺癌中表达下调,然而其在胶质瘤中的表达情况尚未明确。本研究旨在探讨miR-22是否通过靶向调控MTDH表达抑制胶质瘤细胞生长,从而进一步揭示miR-22的抑瘤机制。方法：运用实时定量PCR(quantitative real-time polymerase chain reaction,qRT-PCR)检测75例胶质瘤及17例正常大脑组织中miR-22的表达改变以及与胶质瘤患者预后关系;构建MTDH 3’UTR-荧光素酶报告载体,通过荧光素酶报告检测观察miR-22对MTDH 3’UTR-荧光素酶活性的影响;将miR-22 mimics转染胶质瘤细胞U251,以MTDH siRNA为阳性对照,采用蛋白质印迹法(Western blot)检测其对MTDH蛋白表达水平的影响;然后采用MTT法检测高表达miR-22对U251细胞生长的影响。结果：qRT-PCR检测结果显示,miR-22在75例胶质瘤组织中表达下调;Kaplan-Meier生存分析发现,miR-22表达越高,患者生存率越高(P<0.05);在双荧光素酶报告检测显示,miR-22能特异性地与MTDH 3’UTR结合,抑制其荧光素酶活性。Western blot检测结果显示,miR-22过表达或干扰MTDH可抑制MTDH蛋白的表达。MTT检测发现,miR-22过表达或干扰MTDH可抑制人U251细胞的生长,差异有统计学意义(P<0.05)。结论：miR-22通过靶向调控MTDH的表达而抑制胶质瘤细胞的生长。     

miR-149 represses metastasis of hepatocellular carcinoma by targeting actin-regulatory proteins PPM1F

microRNAs have been implicated in hepatocellular carcinoma (HCC) metastasis, which is predominant cause of high mortality in these patients. Although an increasing body of evidence indicates that miR-149 plays an important role in the growth and metastasis of multiple types of cancers, its role in the progression of HCC remains unknown. Here, we demonstrated that miR-149 was significantly down-regulated in HCC, which was correlated with distant metastasis and TNM stage with statistical significance. A survival analysis showed that decreased miR-149 expression was correlated with a poor prognosis of HCC as well. We found that over-expression of miR-149 suppressed migration and invasion of HCC cells in vitro. In addition, we identified PPM1F (protein phosphatase, Mg²⁺/Mn²⁺-dependent, 1F) as a direct target of miR-149 whose expression was negatively correlated with the expression of miR-149 in HCC tissues. The re-expression of PPM1F rescued the miR-149-mediated inhibition of cell migration and invasion. miR-149 regulated formation of stress fibers to inhibit migration, and re-expression of PPM1F reverted the miR-149-mediated loss of stress fibers. Moreover, we demonstrated that over-expression of miR-149 reduced pMLC2, a downstream effector of PPM1F, in MHCC-97H cells. In vivo studies confirm inhibition of HCC metastasis by miR-149. Taken together, our findings indicates that miR-149 is a potential prognostic biomarker of HCC and that the miR-149/PPM1F regulatory axis represents a novel therapeutic target for HCC treatment.     

miR-449b-5p通过靶向Cyclin E2抑制卵巢癌细胞生长和细胞周期进展

目的:探讨miR-449b-5p对卵巢癌细胞生长的作用和机制.方法:选取2018年6月至2020年6月于四川省人民医院妇产科接受手术的20例卵巢癌患者的癌组织和癌旁组织,以及正常卵巢上皮细胞系HOSEpiC和6种人宫颈癌细胞系SKOV3、ES-2、OVCAR-3、HO8910、CaOV-3和 A2780,用 qPCR ...     

miR-1228 promotes the proliferation and metastasis of hepatoma cells through a p53 forward feedback loop

Background:

The effective mechanisms of microRNAs (miRNAs) functions as oncogenes or tumour suppressors in human hepatocellular carcinoma (HCC) are still obscure. Here, we investigated the function and expression of miR-1228 in HCC.

Methods:

The role of miR-1228 in HCC was determined by colony formation, transwell, and nude mice xenograft experiments. miR-1228 target gene were identified by EGFP reporter assays, real-time PCR, and western blot analysis. Dual-luciferase reporter assay and real-time PCR analysis are used to examine the regulation of p53.

Results:

miR-1228 promoted proliferation and metastasis, and facilitated the transition of cell cycle in hepatoma cells. miR-1228 downregulated p53 expression by binding to its 3′UTR. The ectopic expression of p53 abrogated the phenotypes induced by miR-1228. An inverse correlation existed between miR-1228 and p53 expression in hepatoma tissues compared with the adjacent tissues and three hepatoma cell lines. Moreover, we found that p53 suppressed the expression and promoter activity of miR-1228.

Conclusions:

miR-1228 functions as an oncogene by promoting cell cycle progression and cell mobility and negatively regulates the expression of p53. p53 downregulation in turn leads to an increase in miR-1228 expression, thereby forming a positive feedback loop that contributes to cancerogenesis in HCC.     

哈萨克族食管癌组织中miR-143、miR-145和Survivin mRNA的表达及其临床病理意义

目的:检测新疆哈萨克族食管癌组织中miR-143、miR-145和Survivin mRNA的表达,探讨其在哈萨克族食管癌发生发展中的作用及临床意义。方法:采用实时荧光定量PCR方法检测47例哈萨克族食管癌及癌旁组织标本中miR-143、miR-145和Survivin mRNA的表达水平,分析它们与临床病理指标的关系。结果:miR-143、miR-145在哈萨克族食管癌组织中表达较癌旁组织降低(P均<0.01);Survivin mRNA在哈萨克族食管癌组织中表达较癌旁组织升高(P=0.000);miR-143的表达与肿瘤分化程度、淋巴结转移、临床分期相关(P=0.018、0.004、0.022);miR-145的表达与分化程度、淋巴结转移相关(P=0.007、0.039);Survivin mRNA的表达与淋巴结转移及临床分期相关(P=0.042、0.034)。miR-143的表达与miR-145呈正相关(r=0.662,P=0.000),与Survivin mRNA呈负相关(r=-0.313,P=0.002);结论:在哈萨克族食管癌中miR-143、miR-145低表达、Survivin mRNA高表达,miR-143/145基因簇、Survivin mRNA可能共同参与哈萨克族食管癌发生发展过程。     

miR-145抑制c-Myc基因表达对鼻咽癌细胞增殖的影响

目的：探究miR-145影响鼻咽癌细胞增殖可能的机制。方法：采用Real-time PCR法检测鼻咽癌细胞株CNE-1、CNE-2、CNE-2Z和鼻咽部永生化上皮细胞株NP69中miR-145和c-Myc的mRNA表达水平,Western blotting法检测c-Myc的蛋白表达水平,双萤光素酶报告基因实验检测miR-145与基因c-Myc的关系。分别将miR-Negative control、miR-145 mimics和si-NC、si-c-Myc转染进入CNE-1细胞,采用Real-time PCR及Western blotting法检测转染效果,CCK-8法检测转染后细胞的增殖情况,以及碘化丙啶（IP）染色流式细胞术检测细胞周期情况。结果： miR-145在鼻咽癌细胞系中明显低表达。转染miR-145后明显抑制CNE-1细胞的增殖\[3 d: （1.03±0.02） vs （1.21 ± 0.02）, P<0.05\];\[ 4 d: （1.79±0.02） vs （2.09±0.07）, P<0.01\]和导致G1期阻滞\[（79.57±1.47）% vs （69.98±1.16）%,P<0.05\]。miR-145可以直接作用于c-Myc的3’UTR区域,抑制c-Myc的转录和表达。c-Myc下调可明显抑制CNE-1细胞的增殖\[3 d: （0.80±0.02） vs （1.02±0.01）, P<0.01\];\[4 d: （1.68±0.4） vs （1.92±0.07）, P<0.01\],并致G1期阻滞\[（63.73± 1.81）% vs （54.10±2.26）%,P<0.05\]。结论： miR-145通过靶向作用于c-Myc的3’UTR区来抑制鼻咽癌细胞的增殖,对更深入探索鼻咽癌的诊断和治疗有着重要意义。     

miR-27b通过c-MET抑制胃癌细胞的生长、增殖及侵袭转移

目的:找出调控胃癌细胞c-MET的miRNA,研究该miRNA能否通过c-MET抑制胃癌细胞的生长、增殖及侵袭转移。方法:预测软件筛选出可能调节胃癌c-MET的miRNA。荧光定量PCR检测胃癌细胞株(N87、MKN45、AGS)及正常胃黏膜细胞(GES1)中该miRNA的表达水平。过表达miRNA后检测胃癌细胞株AGS中c-MET的表达水平,选择对c-MET抑制最强的miRNA行双荧光素酶实验。平板克隆及Transwell实验检测过表达该miRNA后胃癌细胞的生长、增殖及侵袭转移能力,过表达c-MET后再次检测胃癌细胞的生长、增殖及侵袭转移能力。结果:预测软件显示miR-34a、miR-27b及miR-31可能调节胃癌cMET表达。miR-34a、miR-27b及miR-31在胃癌细胞株中表达较正常胃黏膜明显降低(P<0.05)。Western bolt显示miR-27b对c-MET的抑制能力最强。双荧光素酶实验同样证实了c-MET是miR-27b的直接作用靶点。平板克隆及Transwell实验显示过表达miR-27b能抑制胃癌细胞的生长、增殖及侵袭转移能力,而过表达c-MET后能恢复胃癌细胞的生长、增殖及侵袭转移能力。结论:miR-27b能作用于c-MET 3’UTR端从而抑制c-MET的表达,并能通过c-MET抑制胃癌细胞的生长、增殖及侵袭转移。     

LncRNA DANCR promotes tumor growth and angiogenesis in ovarian cancer through direct targeting of miR‐145

Differentiation antagonizing non‐protein coding RNA (DANCR) is a newly identified oncogenic long noncoding RNA found in various cancers. However, the functional role of DANCR in tumor angiogenesis and the underlying mechanisms are still unclear. The expression of DANCR was determined in ovarian malignant tissues and cell lines. The functional role of DANCR in tumor angiogenesis was revealed by the following methods: CD31 staining of ovarian tumor tissues, matrigel‐plug assay tissues, HUVEC‐related tube formation assay, and invasion assay. Enzyme‐linked immunosorbent assay, Western blotting, luciferase assay, and rescue experiments were used to investigate the underlying mechanisms of DANCR‐regulating angiogenesis. DANCR was upregulated in ovarian malignant tissues and ovarian cancer cells. Knockdown of DANCR efficiently impaired ovarian tumor growth through inhibition of tumor angiogenesis. Furthermore, the conditional culture medium from DANCR‐knockdown ovarian cells significantly inhibited tube formation and invasion of HUVEC in vitro. Mechanistic investigation indicated that vascular endothelial growth factor A (VEGF‐A, VEGF) plays a crucial role during DANCR inhibition of tumor angiogenesis in ovarian cancer. Further results demonstrated that miR‐145 is the direct binding target of DANCR during regulation of VEGF expression and tumor angiogenesis in ovarian cancer cells. Collectively, DANCR plays a promotional role in tumor angiogenesis in ovarian cancer through regulation of miR‐145/VEGF axis. Therefore, DANCR may be a novel therapy target for ovarian cancer.     

miR-573 inhibits prostate cancer metastasis by regulating epithelial-mesenchymal transition

The metastastic cascade is a complex process that is regulated at multiple levels in prostate cancer (PCa). Recent evidence suggests that microRNAs (miRNAs) are involved in PCa metastasis and hold great promise as therapeutic targets. In this study, we found that miR-573 expression is significantly lower in metastatic tissues than matched primary PCa. Its downregulation is correlated with high Gleason score and cancer-related mortality of PCa patients (P = 0.041, Kaplan-Meier analysis). Through gain- and loss-of function experiments, we demonstrated that miR-573 inhibits PCa cell migration, invasion and TGF-β1-induced epithelial-mesenchymal transition (EMT) in vitro and lung metastasis in vivo. Mechanistically, miR573 directly targets the fibroblast growth factor receptor 1 (FGFR1) gene. Knockdown of FGFR1 phenocopies the effects of miR-573 expression on PCa cell invasion, whereas overexpression of FGFR1 partially attenuates the functions of miR-573. Consequently, miR-573 modulates the activation of FGFR1-downstream signaling in response to fibroblast growth factor 2 (FGF2). Importantly, we showed that GATA3 directly increases miR-573 expression, and thus down-regulates FGFR1 expression, EMT and invasion of PCa cells in a miR-573-dependent manner, supporting the involvement of GATA3, miR-573 and FGFR1 in controlling the EMT process during PCa metastasis. Altogether, our findings demonstrate a novel mechanism by which miR-573 modulates EMT and metastasis of PCa cells, and suggest miR-573 as a potential biomarker and/or therapeutic target for PCa management.     

MiR-20a inhibits cutaneous squamous cell carcinoma metastasis and proliferation by directly targeting LIMK1

Background MicroRNA-20a (miR-20a) plays a key role in tumorigenesis and progression. But its function is reverse in different kinds of malignant tumor, and its role and mechanism in cutaneous squamous cell carcinoma (CSCC) remains unclear. Object To determine the miR-20a’s roles in CSCC and confirm whether LIMK1 is a direct target gene of miR-20a. Methods First miR-20a and LIMK1 expression levels were detected in six pairs of CSCC tissues and corresponding normal skin by qRT-PCR. Then MTT assays and colony formation assays were performed to evaluate the impact of miR-20a on cell proliferation. In addition, scratch migration assays and transwell invasion assays were performed to check miR-20a’s effect on cell metastasis. Since LIMK1 (LIM kinase-1) was predicted as a target gene of miR-20a, the changes of LIMK1 protein and mRNA were measured by western blot and qRT-RCR methods after miR-20a overexpression. Moreover the dual reporter gene assay was performed to confirm whether LIMK1 is a direct target gene of miR-20a. Finally LIMK1 mRNA and miR-20a in other 30 cases of CSCC pathological specimens were determined and a correlation analysis was evaluated. Results The miR-20a significantly low-expressed in CSCC tissues compared with that in matched normal tissues while LIMK1 has a relative higher expression. MiR-20a inhibited A431 and SCL-1 proliferation and metastasis. Both of LIMK1 protein and mRNA levels were downregulated after miR-20a overexpression. The dual reporter gene assays revealed that LIMK1 is a direct target gene of miR-20a. Furthermore, qRT-PCR results of LIMK1 mRNA and miR-20a in 30 cases of CSCC pathological specimens showed miR-20a is inversely correlated with LIMK1 expression. Conclusion Our study demonstrated that miR-20a is involved in the tumor inhibition of CSCC by directly targeting LIMK1 gene. This finding provides potential novel strategies for therapeutic interventions of CSCC.     

结肠癌细胞中miR-145-5p、miR-143-3p的表达变化对多药耐药的影响

目的:探讨人结肠癌细胞中miR-145-5p、miR-143-3p的表达发生变化后对P-gp和MRP的影响。方法:采用Western Blot和qRT-PCR法检测人结肠癌细胞分别转染miR-145-5p mimics/inhibitor、miR-143-3p mimics/inhibitor后P-gp 和MRP的表达。结果:转染miR-145-5p mimics后P-gp和MRP的蛋白和基因表达均降低（P<0.05）,转染miR-145-5p inhibitor后P-gp 和MRP的蛋白和基因表达均升高（P<0.05）。转染miR-145-5p mimics NC和miR-145-5p inhibitor NC后P-gp 和MRP的蛋白和基因表达无明显变化（P>0.05）。转染miR-143-3p mimics后P-gp和MRP的蛋白和基因表达均降低（P<0.05）,miR-143-3p inhibitor后P-gp和MRP的蛋白和基因表达均升高（P<0.05）。转染miR-143-3p mimics NC和miR-143-3p inhibitor NC后P-gp 和MRP的蛋白和基因表达无明显变化（P>0.05）。结论:miR-145-5p及miR-143-3p对多药耐药蛋白P-gp、MRP具有调控作用,参与了结肠癌的多药耐药。