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
Background:The outbreak of Ebola virus disease(EVD)in West Africa between 2014 and 2015 was the largest EDV epidemic since the identification of Ebola virus(EBOV)in 1976,and the countries most strongly affected were S...Background:The outbreak of Ebola virus disease(EVD)in West Africa between 2014 and 2015 was the largest EDV epidemic since the identification of Ebola virus(EBOV)in 1976,and the countries most strongly affected were Sierra Leone,Guinea,and Liberia.Findings:The Sierra Leone-China Friendship Biological Safety Laboratory(SLE-CHN Biosafety Lab),a fixed Biosafety Level 3 laboratory in the capital city of Sierra Leone,was established by the Chinese government and has been active in EBOV detection since 11 March 2015.Complete management and program documents were created for the SLE-CHN Biosafety Lab,and it was divided into four zones(the green,yellow,brown,and red zones)based on the risk assessment.Different types of safe and appropriate personnel protection equipment(PPE)are used in different zones of the laboratory,and it fully meets the Biosafety Level 3 laboratory standards of the World Health Organization.Conclusion:Good preparedness,comprehensive risk assessment and operation documents,appropriate PPE,effective monitoring and intensive training,together with well-designed and reasonable laboratory sectioning are essential for guaranteeing biosafety.展开更多
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.
基金supported by the China Mega-Project for Infectious Disease(2011ZX10004-101,2012ZX10004215)the Research Special Funds for Public Welfare Projects(201302006)the SKLID Development Grant(2012SKLID102).
文摘Background:The outbreak of Ebola virus disease(EVD)in West Africa between 2014 and 2015 was the largest EDV epidemic since the identification of Ebola virus(EBOV)in 1976,and the countries most strongly affected were Sierra Leone,Guinea,and Liberia.Findings:The Sierra Leone-China Friendship Biological Safety Laboratory(SLE-CHN Biosafety Lab),a fixed Biosafety Level 3 laboratory in the capital city of Sierra Leone,was established by the Chinese government and has been active in EBOV detection since 11 March 2015.Complete management and program documents were created for the SLE-CHN Biosafety Lab,and it was divided into four zones(the green,yellow,brown,and red zones)based on the risk assessment.Different types of safe and appropriate personnel protection equipment(PPE)are used in different zones of the laboratory,and it fully meets the Biosafety Level 3 laboratory standards of the World Health Organization.Conclusion:Good preparedness,comprehensive risk assessment and operation documents,appropriate PPE,effective monitoring and intensive training,together with well-designed and reasonable laboratory sectioning are essential for guaranteeing biosafety.
