lncRNA RPL34-AS1通过靶向调控miR-575表达对卵巢癌SKOV3细胞增殖和凋亡的影响

目的探究RPL34-AS1对卵巢癌细胞增殖、迁移的影响及其作用机制。 方法取对数生长期SKOV3细胞用无血清培养基同步化12 h,将pcDNA、pcDNA-RPL34-AS1、si-NC、si-RPL34-AS1、anti-miR-NC、anti-miR-575转染至SKOV3细胞中,分别记为pcDNA组、pcDNA-RPL34-AS1组、si-NC组、si-RPL34-AS1组、anti-miR-NC组、anti-miR-575组;将pcDNA-RPL34-AS1与miR-NC、miR-575分别共转染至SKOV3细胞中,记为pcDNA-RPL34-AS1+miR-NC组、pcDNA-RPL34-AS1+miR-575组。实时荧光定量PCR （RT-qPCR）检测临床组织标本及转染后各组细胞中RPL34-AS1和miR-575的表达水平;双荧光素酶报告实验检测RPL34-AS1和miR-575的靶向关系;四甲基偶氮唑盐比色法（MTT）检测细胞存活率;流式细胞术检测细胞凋亡;蛋白质印迹（Western blot）法检测细胞周期蛋白D1（Cyclin D1）、细胞周期蛋白依赖性激酶抑制剂1A （p21）、B细胞淋巴瘤/白血病-2 （Bcl-2）、Bcl-2相关X蛋白（Bax）蛋白表达水平。两组间比较采用独立样本t检验,多组间比较采用单因素方差分析,组间两两比较采用LSD-t检验。 结果与癌旁组织相比,卵巢癌组织中RPL34-AS1表达水平降低（1.00±0.08比0.47±0.05）,miR-575表达水平升高（1.01±0.07比3.12±0.28）（P < 0.05）。转染si-RPL34-AS1后,细胞活性升高（48 h：0.68±0.06比0.55±0.05;72 h：0.99±0.08比0.71±0.06）,G1期细胞所占比例降低（13.42±1.38比32.15±2.11）,S期细胞所占比例升高（53.75±5.22比34.69±3.41）,细胞凋亡率降低（4.31±0.42比9.25±0.91）,CyclinD1、Bcl-2表达水平升高（0.92±0.08比0.71±0.07;0.86±0.07比0.61±0.06）,p21、Bax表达水平降低（0.13±0.02比0.29±0.03;0.19±0.02比0.31±0.03） （P均< 0.05）。RPL34-AS1靶向调控miR-575,过表达RPL34-AS1或抑制miR-575后可抑制细胞活性,阻滞细胞周期和促进细胞凋亡。miR-575过表达逆转了RPL34-AS1过表达对卵巢癌SKOV3细胞增殖抑制和凋亡促进的作用。 结论过表达RPL34-AS1可抑制卵巢癌SKOV3细胞增殖,促进细胞凋亡,其机制可能与下调miR-575有关。     

LncRNA TP73-AS1 is a novel regulator in cervical cancer via miR-329-3p/ARF1 axis

Cervical cancer holds one of the highest morbidity and mortality in various types of cancers. It even leads to the most number of cancer-related deaths of women. A lot of research has indicated that the anomalous expression of long noncoding RNAs (lncRNAs) would induce carcinogenesis and is associated with poor prognosis of patients with cancer. However, the function and mechanism of many lncRNAs still call for further research. Tumor Protein P73 Antisense RNA 1 (TP73-AS1) is no exception. LncRNA TP73-AS1 has been found to promote cancer progressions in various cancers. It is upregulated in cervical cancer cells. The proliferation and migration ability of cervical cancer cells can also be boosted by TP73-AS1 in return. Meanwhile, miRNA-329-3p is downregulated in cervical cancer cells and could bind with both TP73-AS1 and ADP Ribosylation Factor 1 (ARF1). TP73-AS1 inhibited miR-329-3p expression while miR-329-3p inhibited ARF1 expression. More importantly, TP73-AS1 can positively regulate ARF1 expression. Based on all these experiments, TP73-AS1 regulates ARF1 expression by competitively binding with miR-329-3p, thus regulating cervical cancer progression. Further rescue assays confirmed TP73-AS1 regulates cervical cell proliferation and migration via miR-329-3p/ARF1. TP73-AS1 might serve as a novel regulator in cervical cancer.     

MiR-192-5p inhibits proliferation,migration, and invasion in papillary thyroid carcinoma cells by regulation of SH3RF3

Background: The decreased level of miR-192-5p has been reported in several kinds of cancers, including bladder, colon, ovarian, and non-small cell lung cancer. However, the expression and function of miR-192-5p in papillary thyroid carcinoma/cancer (PTC) remains unknown.Objective: The present study aimed to explore the function and underlying mechanism of miR-192-5p in PTC development.Methods: PTC tissues and relative normal controls from PTC patients were collected. qRT-PCR analysis was performed to measure miR-192-5p and SH3RF3 mRNA level in PTC tissues and cell lines. CCK-8 method and FCM assay were used to test cell proliferation and apoptosis in TPC-1 cells, respectively. The abilities of cell migration and invasion were detected by wound healing and transwell assays, respectively. The protein expression was evaluated by Western blot. The interaction between miR-192-5p and Src homology 3 (SH3) domain containing ring finger 3 (SH3RF3) were confirmed by dual-luciferase reporter assay.Results: MiR-192-5p level was obviously decreased in PTC tissues and cell lines. Overexpression of miR-192-5p suppressed proliferation, migration, invasion, and EMT process, while induced apoptosis in TPC-1 cells. In addition, miR-192-5p negatively modulated SH3RF3 expression by binding to its 3′-untranslated region (3′UTR). Silencing SH3RF3 inhibited the migration, invasion, and EMT of TPC-1 cells. In the meantime, matrine, an alkaloid extracted from herb, exerted its anti-cancer effects in PTC cells dependent on increase in miR-192-5p expression and decrease in SH3RF3 expression.Conclusion: We firstly declared that miR-192-5p played a tumor suppressive role in PTC via targeting SH3RF3. Moreover, matrine exerted its anti-cancer effects in PTC via regulating miR-192-5p/SH3RF3 pathway.     

lncRNA OSER1-AS1 acts as a ceRNA to promote tumorigenesis in hepatocellular carcinoma by regulating miR-372-3p/Rab23 axis

Long non-coding RNAs (lncRNAs) are crucial regulators of tumorigenesis and progression in human cancer, including hepatocellular carcinoma (HCC). However, the role of most lncRNAs that are dysregulated in HCC remains to be elucidated. Here, we investigated the role of OSER1-AS1 in the progression of HCC. The results of database and qRT-PCR analysis demonstrated that OSER1-AS1 was highly expressed in HCC tissues and the high expression of OSER1-AS1 was closely associated with larger tumor size, advanced tumor stages, lower disease free survival and overall survival of HCC patients. OSER1-AS1 knockdown significantly inhibited the proliferation, invasion and migration of HCC cells, and induced the apoptosis. In addition, the dual luciferase reporter assay directly demonstrated that OSER1-AS1 functioned as a molecular sponge for miR-372-3p to promote Rab23 expression. Moreover, the results of immunohistochemistry and western blot analysis showed that Rab23 was highly expressed in HCC tissues, and the high expression of Rab23 was closely associated with the poor overall survival of HCC patients. Immunofluorescence assay also found the subcellular localization of Rab23 in HCC cells. Rab23 was obviously downregulated in cells that were transfected with miR-372-3p mimics. MiR-372-3p mimics significantly inhibited the proliferation and invasion of HCC cells). Rab23 restoration partially reversed miR-372-3p-induced tumor suppressive effects on HCC cells. In conclusion, we found that OSER1-AS1 acted as a ceRNA to sponge miR-372-3p, thereby positively regulating the Rab23 expression and ultimately acting as a tumor suppressor gene in HCC progression.     

LncRNA OIP5-AS1 regulates radioresistance by targeting DYRK1A through miR-369-3p in colorectal cancer cells

Object

This study aimed to investigate the role of lncRNA OIP5-AS1 in regulating radioresistance of colorectal cancer (CRC) cells.

Long noncoding RNA DLGAP1-AS1 promotes cell proliferation in hepatocellular carcinoma via sequestering miR-486-5p

Hepatocellular carcinoma (HCC) is most prevalent tumor in liver and one of the most fatal cancers in the world. Long noncoding RNAs (lncRNAs) have been accepted as important regulators in carcinomas. But there are still many lncRNAs including DLGAP1-AS1 unannotated in HCC. First of all, GEPIA suggested that DLGAP1-AS1 presented high expression in HCC tissue samples relative to the normal tissues. Besides, overexpression of DLGAP1-AS1 was also proved in HCC cell lines. Moreover, DLGAP1-AS1 knockdown efficiently suppressed cell proliferation in HCC. Interestingly, miR-486-5p was predicted and validated to interact with DLGAP1-AS1, while the level of miR-486-5p was significantly increased In HCC after DLGAP1-AS1 knockdown. Moreover, we uncovered that ectopic expression of miR-486-5p induced suppression on HCC cell proliferation and that miR-486-5p inhibition offset the effect of DLGAP1-AS1 silence on HCC cell proliferation and apoptosis. Furthermore, H3F3B was identified as target of miR-486-5p and was therefore positively regulated by DLGAP1-AS1 in HCC. Of note, H3F3B upregulation partly revived the declined cell proliferative capacity in response to DLGAP1-AS1 knockdown. To conclude, DLGAP1-AS1 exerted its oncogenic role in HCC via miR-486-5p/H3F3B axis. Our new findings provided novel theoretical basis for discovery of therapeutic targets of HCC.     

lncRNA MAGI2-AS3下调miR-31-5p抑制肺腺癌细胞的增殖、迁移、侵袭并促进凋亡

目的研究lncRNA MAGI2-AS3对肺癌A549细胞增殖、迁移、侵袭和凋亡的影响和潜在的分子机制。方法根据转染载体不同将A549细胞分为pcDNA3.1组(转染pcDNA3.1)、pcDNA3.1-MAGI2-AS3组(转染pcDNA3.1-MAGI2-AS3)、anti-miR-NC组(转染anti-miR-NC)、anti-miR-31-5p组(转染anti-miR-31-5p)、pcDNA3.1-MAGI2-AS3+miR-NC组(共转染pcDNA3.1-MAGI2-AS3和miR-NC)、pcDNA3.1-MAGI2-AS3+miR-31-5p组(共转染pcDNA3.1-MAGI2-AS3和miR-31-5p mimics)。实时荧光定量PCR(qRT-PCR)检测miR-31-5p和MAGI2-AS3 RNA的表达,四氮唑蓝(MTT)法测定A549细胞增殖活性,Transwell实验检测细胞迁移和侵袭能力,双荧光素酶报告系统验证MAGI2-AS3与miR-31-5p的调控关系,流式细胞术检测细胞凋亡与周期。两组间比较采用独立样本t检验进行分析;多组间比较采用单因素方差分析,组内多重比较采用SNK-q检验。结果与人正常肺细胞HBE相比,肺癌细胞A549中的MAGI2-AS3表达量(0.48±0.03比1.29±0.06)降低,miR-31-5p表达量(1.01±0.05比0.25±0.02)升高;与pcDNA3.1组比较,pcDNA3.1-MAGI2-AS3组A549细胞活力(0.48±0.04比0.77±0.06)、迁移[(81.33±2.87)个比(124.33±3.09)个]和侵袭[(32.00±2.83)个比(53.00±3.27)个]细胞数、S期细胞所占比例(23.01﹪±1.00﹪比32.95﹪±1.06﹪)均降低,凋亡率(19.95﹪±1.25﹪比7.23﹪±0.51﹪)、G0-G1期细胞所占比例(43.58﹪±2.15﹪比33.56﹪±1.23﹪)均升高;与anti-miR-NC组比较,anti-miR-31-5p组A549细胞活力(0.53±0.04比0.78±0.06)、迁移[(76.00±3.74)个比(108.33±2.87)个]和侵袭[(30.00±1.63)个比(42.33±2.05)个]细胞数、S期细胞所占比例(24.43﹪±1.13﹪比32.91﹪±1.08﹪)降低,凋亡率(18.21﹪±1.24﹪比7.29﹪±0.51﹪)、G0-G1期细胞所占比例(41.56﹪±2.19﹪比33.53﹪±1.27﹪)升高,差异有统计学意义(P均<0.05);双荧光素酶报告系统结果显示,MAGI2-AS3靶向负调控miR-31-5p的表达。与pcDNA3.1-MAGI2-AS3+miR-NC组比较,pcDNA3.1-MAGI2-AS3+miR-31-5p组A549细胞活力(0.68±0.06比0.50±0.04)、迁移[(91.00±1.63)个比(52.67±2.62)个]和侵袭[(62.67±2.49)个比(31.67±4.03个)]细胞数升高,凋亡率(10.59﹪±1.0﹪比21.11﹪±1.14﹪)降低,差异有统计学意义(P均<0.05)。结论lncRNA MAGI2-AS3通过靶向miR-31-5p抑制A549细胞的增殖、迁移和侵袭,促进细胞凋亡。lncRNA MAGI2-AS3是肺癌潜在分子治疗靶点。     

Overexpression of lncRNA SLC26A4-AS1 inhibits papillary thyroid carcinoma progression through recruiting ETS1 to promote ITPR1-mediated autophagy

Papillary thyroid carcinoma (PTC), accounting for approximately 85% cases of thyroid cancer, is a common endocrine tumour with a relatively low mortality but an alarmingly high rate of recurrence or persistence. Long non-coding RNAs (lncRNAs) is emerging as a critical player modulating diverse cellular mechanisms correlated with the progression of various cancers, including PTC. Herein, we aimed to investigate the role of lncRNA SLC26A4-AS1 in regulating autophagy and tumour growth during PTC progression. Initially, ITPR1 was identified by bioinformatics analysis as a differentially expressed gene. Then, Western blot and RT-qPCR were conducted to determine the expression of ITPR1 and SLC26A4-AS1 in PTC tissues and cells, both of which were found to be poorly expressed in PTC tissues and cells. Then, we constructed ITPR1-overexpressing cells and revealed that ITPR1 overexpression could trigger the autophagy of PTC cells. Further, we performed a series of gain- and loss-of function experiments. The results suggested that silencing of SLC26A4-AS1 led to declined ITPR1 level, up-regulation of ETS1 promoted ITPR1 expression, and either ETS1 knockdown or autophagy inhibitor Bafilomycin A1 could mitigate the promoting effects of SLC26A4-AS1 overexpression on PTC cell autophagy. In vivo experiments also revealed that SLC26A4-AS1 overexpression suppressed PTC tumour growth. In conclusion, our study elucidated that SLC26A4-AS1 overexpression promoted ITPR1 expression through recruiting ETS1 and thereby promotes autophagy, alleviating PTC progression. These finding provides insight into novel target therapy for the clinical treatment of PTC.     

LncRNA MAGI2-AS3 inhibits hepatocellular carcinoma cell proliferation and migration by targeting the miR-374b-5p/SMG1 signaling pathway

Long noncoding RNAs (lncRNAs) have been proven to play critical roles in cancer progression. Recently, lncRNA MAGI2-AS3 has been revealed to be a tumor suppressor and inhibit cell growth by targeting the Fas/FasL signalling pathway in breast cancer. However, the role and underlying mechanism of MAGI2-AS3 in hepatocellular carcinoma (HCC) remain largely unknown. In the current study, we found that MAGI2-AS3 expression is downregulated in HCC tissues and closely associated with some clinical characteristics (tumor size, lymph node metastasis, and TNM stage) and poor overall survival. Overexpression of MAGI2-AS3 inhibits HCC cell proliferation and migration in vitro, while impedes tumor growth in vivo accordantly. In addition, our data suggest that MAGI2-AS3 could function as an endogenous sponge of miR-374b-5p by directly binding to it and suppressing its expression. Furthermore, miR-374b-5p upregulation could restore the inhibitory effect of MAGI2-AS3 on HCC cells processes. Moreover, suppressor with morphogenetic effect on genitalia family member 1 (SMG1) is positively regulated by MAGI2-AS3 via absorbing miR-374b-5p in HCC cells. More important, SMG1 knockdown reverses the suppressive function of MAGI2-AS3 in HCC cell processes. Taken together, we reveal a functional MAGI2-AS3/miR-374b-5p/SMG1 axis that suppresses HCC progression, potently suggesting a new road for HCC treatment.     

lncRNA NEAT1 facilitates melanoma cell proliferation,migration, and invasion via regulating miR-495-3p and E2F3

Melanoma contributes a lot to skin cancer-related deaths. lncRNAs are implicated in various diseases, including melanoma. lncRNA NEAT1 is frequently dysregulated and can play important roles in multiple cancers. Nevertheless, little has been studied about the function of NEAT1 in melanoma progression. In our present research, we displayed NEAT1 was overexpressed in melanoma cells. A series of functional assays showed that overexpression of NEAT1 promoted the proliferation, migration, and invasion of melanoma cells. By contrast, NEAT1 knockdown obviously restrained melanoma cell progression. Mechanistically, it was revealed that NEAT1 could directly bind with miR-495-3p, which led to a negative effect on miR-495-3p levels. In addition, miR-495-3p was significantly decreased in melanoma cells. Furthermore, E2F3 was postulated as the target of miR-495-3p and overexpression of this miR could suppress the levels of E2F3. Meanwhile, it was exhibited that melanoma cell proliferation, migration, and invasion induced by E2F3 silence was abrogated by miR-495-3p. Moreover, an in vivo xenograft nude mice model was established using A375 cells and it was indicated that NEAT1 promoted melanoma progression in vivo via regulating the miR-495-3p/E2F3 axis. In conclusion, we suggest that NEAT1 exerts an oncogenic effect on melanoma development via inhibition of miR-495-3p and induction of E2F3. NEAT1 might serve as a crucial prognostic biomarker of melanoma.