BACKGROUND Exosomal miRNAs play crucial roles in many central nervous system diseases.Cerebral small vessel disease(CVSD)is a small vessel disease that is affected by various factors.This study aimed to investigate th...BACKGROUND Exosomal miRNAs play crucial roles in many central nervous system diseases.Cerebral small vessel disease(CVSD)is a small vessel disease that is affected by various factors.This study aimed to investigate the role of exosomal miR-320e in the Wnt/β-catenin pathway stimulated by oxidative stress and assess its clinical correlation with psychiatric symptoms in patients with CVSD.AIM To explore whether exosomal miR-320e could suppress the Wnt/β-catenin pathway and play a protective role in CVSD progression,as well as examine its potential correlation with cognitive impairment and depression in patients with CVSD.METHODS Differentially expressed exosomal miRNAs were filtered by sequencing plasma exosomes from patients with CVSD and healthy controls.Bioinformatics and dual luciferase analyses were used to confirm the binding of miR-320e to Wnt2,and the mRNA and protein levels of downstream components in the Wnt/β-catenin pathway were evaluated when overexpressed or with knockdown of miR-320e under H2O2-induced oxidative stress.In addition,Wnt2-targeting siRNA was used to confirm the role of miR-320e in the Wnt2-mediated inhibition of the Wnt/β-catenin pathway.A retrospective analysis was conducted among patients with CVSD to confirm the correlation between miR-320e expression and the severity of cognitive impairment and depression,which were quantified using the Montreal Cognitive Assessment(MoCA)/Executive Function Assessment(EFA),and the Hamilton Depression Scale(HAMD)/Beck Depression Inventory(BDI),respectively.RESULTS High-throughput sequencing revealed that exosomal miR-320e was downregulated in patients with CVSD.Bioinformatics analysis and dual-luciferase reporter gene experiments showed that exosomal miR-320e inhibited the Wnt/β-catenin pathway in response to oxidative stress by targeting the 3'noncoding region of Wnt2.Uptake of exosomes carrying miR-320e into endothelial cells could also target Wnt2 and inhibit the Wnt2/β-catenin pathway.Elevated miR-320e expression may protect patients with CVSD from relatively severe cognitive impairment and depression,as it was found to have a positive correlation with the MoCA/EFA and HAMD/BDI scores.CONCLUSION Our results suggest that exosomal miR-320e suppresses the Wnt/β-catenin pathway and may play a protective role in CVSD progression.展开更多
本研究初步探讨过表达miRNA-320a对抑制神经胶质瘤U251细胞迁移、侵袭的可能的机制。实验开始前我们利用生物信息学软件进行分析对比miRNA-320a与水通道蛋白4(AQP4)之间的靶点结合关系,然后我们用miRNA-320a mimic及Ncontrol对U251细胞...本研究初步探讨过表达miRNA-320a对抑制神经胶质瘤U251细胞迁移、侵袭的可能的机制。实验开始前我们利用生物信息学软件进行分析对比miRNA-320a与水通道蛋白4(AQP4)之间的靶点结合关系,然后我们用miRNA-320a mimic及Ncontrol对U251细胞株进行转染,48 h后进行下一步实验。首先用q-PCR验证过表达转染情况,以及水通道蛋白4(AQP4)m RNA的表达水平,其次用划痕和Transwell检测转染后细胞株的迁移侵袭能力,最后用Western blotting测定AQP4的表达水平。生物信息分析可得miRNA-320a在AQP4 m RNA 3'UTR区域能稳定结合,实验结果显示转染mimic后,过表达组明显升高,且过表达组AQP4 m RNA的表达明显被抑制,划痕和Transwell实验提示了过表达miRNA-320a后能抑制U251细胞株的迁移侵袭能力(p<0.01)。Western blotting结果显示,过表达miRNA-320a与对照组相比能明显抑制AQP4蛋白的表达。所有研究结果提示miRNA-320a能靶向作用AQP4 m RNA 3'UTR区域,并抑制其蛋白表达,从而抑制了肿瘤细胞U251的迁移侵袭能力,为临床治疗恶性胶质瘤提供新的参考。展开更多
BACKGROUND Ectopic expression of miRNAs promotes tumor development and progression.miRNA(miR)-320a is downregulated in many cancers,including gastric cancer(GC).However,the mechanism underlying its downregulation and ...BACKGROUND Ectopic expression of miRNAs promotes tumor development and progression.miRNA(miR)-320a is downregulated in many cancers,including gastric cancer(GC).However,the mechanism underlying its downregulation and the role of miR-320a in GC are unknown.AIM To determine expression and biological functions of miR-320a in GC and investigate the underlying molecular mechanisms.METHODS Quantitative real-time polymerase chain reaction(PCR)was used to determine expression of miR-320a in GC cell lines and tissues.TargetScanHuman7.1,miRDB,and microRNA.org were used to predict the possible targets of miR-320a,and a dual luciferase assay was used to confirm the findings.Western blotting was used to detect the protein levels of pre-B-cell leukemia homeobox 3(PBX3)in GC cells and tissue samples.Cell Counting Kit-8 proliferation,Transwell,wound healing,and apoptosis assays were performed to analyze the biological functions of miR-320a in GC cells.Methylation-specific PCR was used to analyze the methylation level of the miR-320a promoter CpG islands.5-Aza-2’-deoxycytidine(5-Aza-CdR)and trichostatin A(TSA)were used to treat GC cells.RESULTS miR-320a expression was lower in GC cell lines and tissues than in the normal gastric mucosa cell line GES-1 and matched adjacent normal tissues.miR-320a overexpression suppressed GC cell proliferation,invasion and migration,and induced apoptosis.PBX3 was a target of miR-320a in GC.The methylation level of the miR-320a promoter CpG islands was elevated and this was partly reversed by 5-Aza-CdR and TSA.CONCLUSION miR-320a acts as a tumor suppressor and inhibits malignant behavior of GC cells,partly by targeting PBX3.DNA methylation is an important mechanism associated with low expression of miR-320a.展开更多
文摘BACKGROUND Exosomal miRNAs play crucial roles in many central nervous system diseases.Cerebral small vessel disease(CVSD)is a small vessel disease that is affected by various factors.This study aimed to investigate the role of exosomal miR-320e in the Wnt/β-catenin pathway stimulated by oxidative stress and assess its clinical correlation with psychiatric symptoms in patients with CVSD.AIM To explore whether exosomal miR-320e could suppress the Wnt/β-catenin pathway and play a protective role in CVSD progression,as well as examine its potential correlation with cognitive impairment and depression in patients with CVSD.METHODS Differentially expressed exosomal miRNAs were filtered by sequencing plasma exosomes from patients with CVSD and healthy controls.Bioinformatics and dual luciferase analyses were used to confirm the binding of miR-320e to Wnt2,and the mRNA and protein levels of downstream components in the Wnt/β-catenin pathway were evaluated when overexpressed or with knockdown of miR-320e under H2O2-induced oxidative stress.In addition,Wnt2-targeting siRNA was used to confirm the role of miR-320e in the Wnt2-mediated inhibition of the Wnt/β-catenin pathway.A retrospective analysis was conducted among patients with CVSD to confirm the correlation between miR-320e expression and the severity of cognitive impairment and depression,which were quantified using the Montreal Cognitive Assessment(MoCA)/Executive Function Assessment(EFA),and the Hamilton Depression Scale(HAMD)/Beck Depression Inventory(BDI),respectively.RESULTS High-throughput sequencing revealed that exosomal miR-320e was downregulated in patients with CVSD.Bioinformatics analysis and dual-luciferase reporter gene experiments showed that exosomal miR-320e inhibited the Wnt/β-catenin pathway in response to oxidative stress by targeting the 3'noncoding region of Wnt2.Uptake of exosomes carrying miR-320e into endothelial cells could also target Wnt2 and inhibit the Wnt2/β-catenin pathway.Elevated miR-320e expression may protect patients with CVSD from relatively severe cognitive impairment and depression,as it was found to have a positive correlation with the MoCA/EFA and HAMD/BDI scores.CONCLUSION Our results suggest that exosomal miR-320e suppresses the Wnt/β-catenin pathway and may play a protective role in CVSD progression.
文摘本研究初步探讨过表达miRNA-320a对抑制神经胶质瘤U251细胞迁移、侵袭的可能的机制。实验开始前我们利用生物信息学软件进行分析对比miRNA-320a与水通道蛋白4(AQP4)之间的靶点结合关系,然后我们用miRNA-320a mimic及Ncontrol对U251细胞株进行转染,48 h后进行下一步实验。首先用q-PCR验证过表达转染情况,以及水通道蛋白4(AQP4)m RNA的表达水平,其次用划痕和Transwell检测转染后细胞株的迁移侵袭能力,最后用Western blotting测定AQP4的表达水平。生物信息分析可得miRNA-320a在AQP4 m RNA 3'UTR区域能稳定结合,实验结果显示转染mimic后,过表达组明显升高,且过表达组AQP4 m RNA的表达明显被抑制,划痕和Transwell实验提示了过表达miRNA-320a后能抑制U251细胞株的迁移侵袭能力(p<0.01)。Western blotting结果显示,过表达miRNA-320a与对照组相比能明显抑制AQP4蛋白的表达。所有研究结果提示miRNA-320a能靶向作用AQP4 m RNA 3'UTR区域,并抑制其蛋白表达,从而抑制了肿瘤细胞U251的迁移侵袭能力,为临床治疗恶性胶质瘤提供新的参考。
基金Supported by the Natural Science Foundation of Liaoning Province,No.201602817
文摘BACKGROUND Ectopic expression of miRNAs promotes tumor development and progression.miRNA(miR)-320a is downregulated in many cancers,including gastric cancer(GC).However,the mechanism underlying its downregulation and the role of miR-320a in GC are unknown.AIM To determine expression and biological functions of miR-320a in GC and investigate the underlying molecular mechanisms.METHODS Quantitative real-time polymerase chain reaction(PCR)was used to determine expression of miR-320a in GC cell lines and tissues.TargetScanHuman7.1,miRDB,and microRNA.org were used to predict the possible targets of miR-320a,and a dual luciferase assay was used to confirm the findings.Western blotting was used to detect the protein levels of pre-B-cell leukemia homeobox 3(PBX3)in GC cells and tissue samples.Cell Counting Kit-8 proliferation,Transwell,wound healing,and apoptosis assays were performed to analyze the biological functions of miR-320a in GC cells.Methylation-specific PCR was used to analyze the methylation level of the miR-320a promoter CpG islands.5-Aza-2’-deoxycytidine(5-Aza-CdR)and trichostatin A(TSA)were used to treat GC cells.RESULTS miR-320a expression was lower in GC cell lines and tissues than in the normal gastric mucosa cell line GES-1 and matched adjacent normal tissues.miR-320a overexpression suppressed GC cell proliferation,invasion and migration,and induced apoptosis.PBX3 was a target of miR-320a in GC.The methylation level of the miR-320a promoter CpG islands was elevated and this was partly reversed by 5-Aza-CdR and TSA.CONCLUSION miR-320a acts as a tumor suppressor and inhibits malignant behavior of GC cells,partly by targeting PBX3.DNA methylation is an important mechanism associated with low expression of miR-320a.
