目的探讨miR-16-1对淋巴瘤细胞凋亡、侵袭及苏氨酸蛋白激酶B(ProteinkinaseB,Akt)1基因作用机制的研究。方法收集我院淋巴瘤患者肿瘤标准及正常胸腺标本,购自上海通派公司的人T淋巴瘤细胞Raji亚系,分为淋巴瘤组(未经转染)、NC组(Raji细...目的探讨miR-16-1对淋巴瘤细胞凋亡、侵袭及苏氨酸蛋白激酶B(ProteinkinaseB,Akt)1基因作用机制的研究。方法收集我院淋巴瘤患者肿瘤标准及正常胸腺标本,购自上海通派公司的人T淋巴瘤细胞Raji亚系,分为淋巴瘤组(未经转染)、NC组(Raji细胞转染miR-16-1-NC)、miR-16-1组(Raji细胞转染miR-16-1minmics)及药物对照组(Raji细胞联合1mmol/L+10μmol/L的地西他滨),分别采用qRT-PCR方法检测肿瘤及正常组织、Raji细胞的miR-16-1相对表达,分别采用MTT方法、流式细胞仪、Transwell小室方法检测Raji细胞存活率、凋亡率、侵袭数目及迁移率;分别采用双荧光素酶报告基因、qRTPCR及免疫印迹检测AKT1、张力蛋白同源基因(Phosphatase and tensin homology deleted on chromosome ten,PTEN)及其磷酸化表达。结果与正常组织表相比,miR-16-1在淋巴瘤病理组织中表达下调,组间比较存在差异(P<0.001);NC组和淋巴瘤组Raji细胞中miR-16-1表达无统计学意义(P>0.05),与NC组相比,miR-16-1组miR-16-1升高,存在差异(P<0.05);NC组和淋巴瘤组细胞存活率无意义(P>0.05),与NC组miR-16-1组细胞存活率降低存在差异(P<0.05);NC组和淋巴瘤组Raji细胞凋亡率无差异(P>0.05),miR-16-1组凋亡率高于NC组,组间无差异(P>0.05);NC组和淋巴瘤组Raji细胞侵袭数目无差异(P>0.05),miR-16-1组侵袭数目低于NC组,存在差异(P<0.05);NC组和淋巴瘤组Raji细胞迁移率比较无差异(P>0.05),miR-16-1组细胞迁移率低于NC组(P<0.05);miR-16-1组细胞中AKT1、PTEN基因及其磷酸化蛋白与NC组、淋巴瘤组比较均存在差异(P<0.05);双荧光素酶报告:与miR-NC相比,miR-16-1mimics可降低野生型AKT1活性,增加野生型PTEN的活性,说明AKT1、PTEN可能是miR-16-1的靶基因。结论人T淋巴瘤细胞Raji转染miR-16-1 mimics后,能够抑制其细胞活性,减少侵袭及迁移,加快凋亡,研究机制可能与调控AKT1、PTEN信号通路活性相关。展开更多
Gamma-aminobutyric acid(GABA)ergic neurons,the most abundant inhibitory neurons in the human brain,have been found to be reduced in many neurological disorders,including Alzheimer's disease and Alzheimer's dis...Gamma-aminobutyric acid(GABA)ergic neurons,the most abundant inhibitory neurons in the human brain,have been found to be reduced in many neurological disorders,including Alzheimer's disease and Alzheimer's disease-related dementia.Our previous study identified the upregulation of microRNA-502-3p(miR-502-3p)and downregulation of GABA type A receptor subunitα-1 in Alzheimer's disease synapses.This study investigated a new molecular relationship between miR-502-3p and GABAergic synapse function.In vitro studies were perfo rmed using the mouse hippocampal neuronal cell line HT22 and miR-502-3p agomiRs and antagomiRs.In silico analysis identified multiple binding sites of miR-502-3p at GABA type A receptor subunitα-1 mRNA.Luciferase assay confirmed that miR-502-3p targets the GABA type A receptor subunitα-1 gene and suppresses the luciferase activity.Furthermore,quantitative reve rse transcription-polymerase chain reaction,miRNA in situ hybridization,immunoblotting,and immunostaining analysis confirmed that overexpression of miR-502-3p reduced the GABA type A receptor subunitα-1 level,while suppression of miR-502-3p increased the level of GABA type A receptor subunitα-1 protein.Notably,as a result of the overexpression of miR-502-3p,cell viability was found to be reduced,and the population of necrotic cells was found to be increased.The whole cell patch-clamp analysis of human-GABA receptor A-α1/β3/γ2L human embryonic kidney(HEK)recombinant cell line also showed that overexpression of miR-502-3p reduced the GABA current and overall GABA function,suggesting a negative correlation between miR-502-3p levels and GABAergic synapse function.Additionally,the levels of proteins associated with Alzheimer s disease were high with miR-502-3p overexpression and reduced with miR-502-3p suppression.The present study provides insight into the molecular mechanism of regulation of GABAergic synapses by miR-502-3p.We propose that micro-RNA,in particular miR-502-3p,could be a potential therapeutic to rget to modulate GABAergic synapse function in neurological disorders,including Alzheimer's disease and Alzheimer's diseaserelated dementia.展开更多
BACKGROUND MicroRNAs(miRNAs)regulate gene expression and play a critical role in cancer physiology.However,there is still a limited understanding of the function and regulatory mechanism of miRNAs in gastric cancer(GC...BACKGROUND MicroRNAs(miRNAs)regulate gene expression and play a critical role in cancer physiology.However,there is still a limited understanding of the function and regulatory mechanism of miRNAs in gastric cancer(GC).AIM To investigate the role and molecular mechanism of miRNA-145-5p(miR145-5p)in the progression of GC.METHODS Real-time polymerase chain reaction(RT-PCR)was used to detect miRNA expression in human GC tissues and cells.The ability of cancer cells to migrate and invade was assessed using wound-healing and transwell assays,respectively.Cell proliferation was measured using cell counting kit-8 and colony formation assays,and apoptosis was evaluated using flow cytometry.Expression of the epithelial-mesenchymal transition(EMT)-associated protein was determined by Western blot.Targets of miR-145-5p were predicated using bioinformatics analysis and verified using a dual-luciferase reporter system.Serpin family E member 1(SERPINE1)expression in GC tissues and cells was evaluated using RT-PCR and immunohistochemical staining.The correlation between SERPINE1 expression and overall patient survival was determined using Kaplan-Meier plot analysis.The association between SERPINE1 and GC progression was also tested.A rescue experiment of SERPINE1 overexpression was conducted to verify the relationship between this protein and miR-145-5p.The mechanism by which miR-145-5p influences GC progression was further explored by assessing tumor formation in nude mice.RESULTS GC tissues and cells had reduced miR-145-5p expression and SERPINE1 was identified as a direct target of this miRNA.Overexpression of miR-145-5p was associated with decreased GC cell proliferation,invasion,migration,and EMT,and these effects were reversed by forcing SERPINE1 expression.Kaplan-Meier plot analysis revealed that patients with higher SERPINE1 expression had a shorter survival rate than those with lower SERPINE1 expression.Nude mouse tumorigenesis experiments confirmed that miR-145-5p targets SERPINE1 to regulate extracellular signal-regulated kinase-1/2(ERK1/2).CONCLUSION This study found that miR-145-5p inhibits tumor progression and is expressed in lower amounts in patients with GC.MiR-145-5p was found to affect GC cell proliferation,migration,and invasion by negatively regulating SERPINE1 levels and controlling the ERK1/2 pathway.展开更多
文摘目的探讨miR-16-1对淋巴瘤细胞凋亡、侵袭及苏氨酸蛋白激酶B(ProteinkinaseB,Akt)1基因作用机制的研究。方法收集我院淋巴瘤患者肿瘤标准及正常胸腺标本,购自上海通派公司的人T淋巴瘤细胞Raji亚系,分为淋巴瘤组(未经转染)、NC组(Raji细胞转染miR-16-1-NC)、miR-16-1组(Raji细胞转染miR-16-1minmics)及药物对照组(Raji细胞联合1mmol/L+10μmol/L的地西他滨),分别采用qRT-PCR方法检测肿瘤及正常组织、Raji细胞的miR-16-1相对表达,分别采用MTT方法、流式细胞仪、Transwell小室方法检测Raji细胞存活率、凋亡率、侵袭数目及迁移率;分别采用双荧光素酶报告基因、qRTPCR及免疫印迹检测AKT1、张力蛋白同源基因(Phosphatase and tensin homology deleted on chromosome ten,PTEN)及其磷酸化表达。结果与正常组织表相比,miR-16-1在淋巴瘤病理组织中表达下调,组间比较存在差异(P<0.001);NC组和淋巴瘤组Raji细胞中miR-16-1表达无统计学意义(P>0.05),与NC组相比,miR-16-1组miR-16-1升高,存在差异(P<0.05);NC组和淋巴瘤组细胞存活率无意义(P>0.05),与NC组miR-16-1组细胞存活率降低存在差异(P<0.05);NC组和淋巴瘤组Raji细胞凋亡率无差异(P>0.05),miR-16-1组凋亡率高于NC组,组间无差异(P>0.05);NC组和淋巴瘤组Raji细胞侵袭数目无差异(P>0.05),miR-16-1组侵袭数目低于NC组,存在差异(P<0.05);NC组和淋巴瘤组Raji细胞迁移率比较无差异(P>0.05),miR-16-1组细胞迁移率低于NC组(P<0.05);miR-16-1组细胞中AKT1、PTEN基因及其磷酸化蛋白与NC组、淋巴瘤组比较均存在差异(P<0.05);双荧光素酶报告:与miR-NC相比,miR-16-1mimics可降低野生型AKT1活性,增加野生型PTEN的活性,说明AKT1、PTEN可能是miR-16-1的靶基因。结论人T淋巴瘤细胞Raji转染miR-16-1 mimics后,能够抑制其细胞活性,减少侵袭及迁移,加快凋亡,研究机制可能与调控AKT1、PTEN信号通路活性相关。
基金supported by the National Institute on Aging (NIA)National Institutes of Health (NIH)+3 种基金Nos.K99AG065645,R00AG065645R00AG065645-04S1 (to SK)NIH research grants,NINDS,No.R01 NS115834NINDS/NIA,No.R01 NS115834-02S1 (to LG)。
文摘Gamma-aminobutyric acid(GABA)ergic neurons,the most abundant inhibitory neurons in the human brain,have been found to be reduced in many neurological disorders,including Alzheimer's disease and Alzheimer's disease-related dementia.Our previous study identified the upregulation of microRNA-502-3p(miR-502-3p)and downregulation of GABA type A receptor subunitα-1 in Alzheimer's disease synapses.This study investigated a new molecular relationship between miR-502-3p and GABAergic synapse function.In vitro studies were perfo rmed using the mouse hippocampal neuronal cell line HT22 and miR-502-3p agomiRs and antagomiRs.In silico analysis identified multiple binding sites of miR-502-3p at GABA type A receptor subunitα-1 mRNA.Luciferase assay confirmed that miR-502-3p targets the GABA type A receptor subunitα-1 gene and suppresses the luciferase activity.Furthermore,quantitative reve rse transcription-polymerase chain reaction,miRNA in situ hybridization,immunoblotting,and immunostaining analysis confirmed that overexpression of miR-502-3p reduced the GABA type A receptor subunitα-1 level,while suppression of miR-502-3p increased the level of GABA type A receptor subunitα-1 protein.Notably,as a result of the overexpression of miR-502-3p,cell viability was found to be reduced,and the population of necrotic cells was found to be increased.The whole cell patch-clamp analysis of human-GABA receptor A-α1/β3/γ2L human embryonic kidney(HEK)recombinant cell line also showed that overexpression of miR-502-3p reduced the GABA current and overall GABA function,suggesting a negative correlation between miR-502-3p levels and GABAergic synapse function.Additionally,the levels of proteins associated with Alzheimer s disease were high with miR-502-3p overexpression and reduced with miR-502-3p suppression.The present study provides insight into the molecular mechanism of regulation of GABAergic synapses by miR-502-3p.We propose that micro-RNA,in particular miR-502-3p,could be a potential therapeutic to rget to modulate GABAergic synapse function in neurological disorders,including Alzheimer's disease and Alzheimer's diseaserelated dementia.
文摘BACKGROUND MicroRNAs(miRNAs)regulate gene expression and play a critical role in cancer physiology.However,there is still a limited understanding of the function and regulatory mechanism of miRNAs in gastric cancer(GC).AIM To investigate the role and molecular mechanism of miRNA-145-5p(miR145-5p)in the progression of GC.METHODS Real-time polymerase chain reaction(RT-PCR)was used to detect miRNA expression in human GC tissues and cells.The ability of cancer cells to migrate and invade was assessed using wound-healing and transwell assays,respectively.Cell proliferation was measured using cell counting kit-8 and colony formation assays,and apoptosis was evaluated using flow cytometry.Expression of the epithelial-mesenchymal transition(EMT)-associated protein was determined by Western blot.Targets of miR-145-5p were predicated using bioinformatics analysis and verified using a dual-luciferase reporter system.Serpin family E member 1(SERPINE1)expression in GC tissues and cells was evaluated using RT-PCR and immunohistochemical staining.The correlation between SERPINE1 expression and overall patient survival was determined using Kaplan-Meier plot analysis.The association between SERPINE1 and GC progression was also tested.A rescue experiment of SERPINE1 overexpression was conducted to verify the relationship between this protein and miR-145-5p.The mechanism by which miR-145-5p influences GC progression was further explored by assessing tumor formation in nude mice.RESULTS GC tissues and cells had reduced miR-145-5p expression and SERPINE1 was identified as a direct target of this miRNA.Overexpression of miR-145-5p was associated with decreased GC cell proliferation,invasion,migration,and EMT,and these effects were reversed by forcing SERPINE1 expression.Kaplan-Meier plot analysis revealed that patients with higher SERPINE1 expression had a shorter survival rate than those with lower SERPINE1 expression.Nude mouse tumorigenesis experiments confirmed that miR-145-5p targets SERPINE1 to regulate extracellular signal-regulated kinase-1/2(ERK1/2).CONCLUSION This study found that miR-145-5p inhibits tumor progression and is expressed in lower amounts in patients with GC.MiR-145-5p was found to affect GC cell proliferation,migration,and invasion by negatively regulating SERPINE1 levels and controlling the ERK1/2 pathway.
