Nanomaterials as drug carriers hold promise for the treatment of carcinomas,but integrating multiple functions into a single vector is difficult.In this study,we aim to develop efficie nt materials as vectors for co-d...Nanomaterials as drug carriers hold promise for the treatment of carcinomas,but integrating multiple functions into a single vector is difficult.In this study,we aim to develop efficie nt materials as vectors for co-delivery of microRNA-122(miR-122)and sorafenib(SRF).We successfully synthesized amphiphilic galactose-modified PEGylated poly(ami no-co-ester)(Gal-PEG-PPMS)copolymers consisted of hydrophilic Gal-PEG5 k chain segments and hydrophobic poly(ω-pentadecalactone-co-N-methyldiethyleneamine-co-sebacic acid)chain segments,which self-assembled to form cationic micelles at pH 5.2.The results showed that the micelles could encapsulate SRF and bind miR122 simultaneously,increase cellular uptake efficiency.Furthermore,the micelles showed favorable transfection efficiency in enhancing miR122 expression level,the migration and invasion ability of hepatocellular carcinoma(HCC)cells we re significantly inhibited after being tra nsfected with miR122-loaded micelles.Most importantly,the co-delivery micelles decreased cell activities of HepG2 cells,which was more effective than miR122 or SRF loaded micelles alone.Collectively,Gal-PEG-PPMS nanoparticles are promising multifunctional carriers for miR122 and SRF co-delivery system to treat HCC.展开更多
Objective:Plant-derived cytotoxic transgene expression,such as trichosanthin(tcs),regulated by recombinant adeno-associated virus(r AAV)vector is a promising cancer gene therapy.However,the cytotoxic transgene can ham...Objective:Plant-derived cytotoxic transgene expression,such as trichosanthin(tcs),regulated by recombinant adeno-associated virus(r AAV)vector is a promising cancer gene therapy.However,the cytotoxic transgene can hamper the vector production in the r AAV producer cell line,human embryonic kidney(HEK293)cells.Here,we explored micro RNA-122(miR122)and its target sequence to limit the expression of the cytotoxic gene in the r AAV producer cells.Methods:A miR122 target(122 T)sequence was incorporated into the 30 untranslated region of the tcs c DNA sequence.The firefly luciferase(fluc)transgene was used as an appropriate control.Cell line HEK293-mir122 was generated by the lentiviral vector-mediated genome integration of the mir122 gene in parental HEK293 cells.The effects of miR122 overexpression on cell growth,transgene expression,and r AAV production were determined.Results:The presence of 122 T sequence significantly reduced transgene expression in the miR122-enriched Huh7 cell line(in vitro),fresh human hepatocytes(ex vivo),and mouse liver(in vivo).Also,the normal liver physiology was unaffected by delivery of 122 T sequence by r AAV vectors.Compared with the parental cells,the miR122-overexpressing HEK293-mir122 cell line showed similar cell growth rate and expression of transgene without 122 T,as well as the ability to produce liver-targeting r AAV vectors.Fascinatingly,the yield of r AAV vectors carrying the tcs-122 T gene was increased by 77.7-fold in HEK293-mir122 cells.Moreover,the tcs-122 T-containing r AAV vectors significantly reduced the proliferation of hepatocellular carcinoma cells without affecting the normal liver cells.Conclusion:HEK293-mir122 cells along with the 122 T sequence provide a potential tool to attenuate the cytotoxic transgene expression,such as tcs,during r AAV vector production.展开更多
This review intends to uncover how information from large-scale genetic profiling(whole genome sequencing, and whole exome sequencing) of nonalcoholic fatty liver disease(NAFLD), as well as information from circulatin...This review intends to uncover how information from large-scale genetic profiling(whole genome sequencing, and whole exome sequencing) of nonalcoholic fatty liver disease(NAFLD), as well as information from circulating transcriptomics(cell-free mi RNAs) and metabolomics, contributes to the understanding of NAFLD pathogenesis. A further aim is to address the question of whether OMICs information is ready to be implemented in the clinics. The available evidence suggests that any new knowledge pertaining to molecular signatures associated with NAFLD and nonalcoholic steatohepatitis should be promptly translated into the clinical setting. Nevertheless, rigorous steps that must include validation and replication are mandatory before utilizing OMICs biomarkers in diagnostics to identify patients at risk of advanced disease, including liver cancer.展开更多
乙型肝炎病毒中的功能蛋白乙肝病毒X蛋白(Hepatitis B virus X protein,HBx)在促进肝细胞恶性改变中起到重要作用,但目前HBx调控肝癌细胞生长的具体机制仍未完全阐明。miR-122是具有抑癌特性的一类miR,在乙肝相关肝癌中表达减少。为了研...乙型肝炎病毒中的功能蛋白乙肝病毒X蛋白(Hepatitis B virus X protein,HBx)在促进肝细胞恶性改变中起到重要作用,但目前HBx调控肝癌细胞生长的具体机制仍未完全阐明。miR-122是具有抑癌特性的一类miR,在乙肝相关肝癌中表达减少。为了研究HBx通过微小RNA(microRNA,miR)-122调节肝癌细胞增殖及细胞周期的作用,本研究培养肝癌HepG2细胞株并进行分组,NC组转染NC慢病毒载体、HBx组转染HBx慢病毒载体、HBx+NC模拟物组转染HBx慢病毒载体及NC模拟物、HBx+miR-122模拟物组转染HBx慢病毒载体及miR-122模拟物、NC模拟物组转染NC模拟物、miR-122模拟物组:转染miR-122模拟物。通过MTS法检测细胞增殖活力,流式细胞术检测细胞周期,PCR检测miR-122表达量,western blot检测细胞周期蛋白G1(CyclinG1)、X连锁凋亡抑制蛋白(XIAP)、β-连环蛋白(β-catenin)的表达量。结果显示HBx组细胞的OD值、细胞周期G2/M期比例及细胞中CyclinG1、XIAP、β-catenin的表达量均明显高于NC组(P<0.05),细胞周期G0/G1期、S期比例及细胞中miR-122表达量均明显低于NC组(P<0.05);HBx+miR-122模拟物组细胞的OD值、细胞周期G2/M期比例及细胞中CyclinG1、XIAP、β-catenin的表达量均明显低于HBx+NC模拟物组(P<0.05),细胞周期G0/G1期、S期比例及细胞中miR-122表达量均明显高于HBx+NC模拟物组(P<0.05);miR-122模拟物组CyclinG1、XIAP、β-catenin荧光素酶报告基因的荧光活性明显低于NC模拟物组(P<0.05)。本研究结果充分说明HBx能够增强肝癌细胞的增殖活力及明显加速细胞周期,且该作用部分由miR-122的下调所介导。本研究首次阐明了HBx调节肝癌细胞生长的分子机制,也初步探明了具有抑癌活性的miR-122在肝癌细胞中可能靶向CyclinG1、XIAP、β-catenin等基因。展开更多
基金supported by the National Natural Science Foundation of China(No.51773231)the Natural Science Foundation of Guangdong Province(Nos.2016A030313315,2014A030312018)the Project of Key Laboratory of Sensing Technology and Biomedical Instruments of Guangdong Province(No.2011A060901013)。
文摘Nanomaterials as drug carriers hold promise for the treatment of carcinomas,but integrating multiple functions into a single vector is difficult.In this study,we aim to develop efficie nt materials as vectors for co-delivery of microRNA-122(miR-122)and sorafenib(SRF).We successfully synthesized amphiphilic galactose-modified PEGylated poly(ami no-co-ester)(Gal-PEG-PPMS)copolymers consisted of hydrophilic Gal-PEG5 k chain segments and hydrophobic poly(ω-pentadecalactone-co-N-methyldiethyleneamine-co-sebacic acid)chain segments,which self-assembled to form cationic micelles at pH 5.2.The results showed that the micelles could encapsulate SRF and bind miR122 simultaneously,increase cellular uptake efficiency.Furthermore,the micelles showed favorable transfection efficiency in enhancing miR122 expression level,the migration and invasion ability of hepatocellular carcinoma(HCC)cells we re significantly inhibited after being tra nsfected with miR122-loaded micelles.Most importantly,the co-delivery micelles decreased cell activities of HepG2 cells,which was more effective than miR122 or SRF loaded micelles alone.Collectively,Gal-PEG-PPMS nanoparticles are promising multifunctional carriers for miR122 and SRF co-delivery system to treat HCC.
基金supported by the China Postdoctoral Science Foundation(No.2019M651381)the Shanghai Talent Development Funding(No.2019115)to Chen Zhong。
文摘Objective:Plant-derived cytotoxic transgene expression,such as trichosanthin(tcs),regulated by recombinant adeno-associated virus(r AAV)vector is a promising cancer gene therapy.However,the cytotoxic transgene can hamper the vector production in the r AAV producer cell line,human embryonic kidney(HEK293)cells.Here,we explored micro RNA-122(miR122)and its target sequence to limit the expression of the cytotoxic gene in the r AAV producer cells.Methods:A miR122 target(122 T)sequence was incorporated into the 30 untranslated region of the tcs c DNA sequence.The firefly luciferase(fluc)transgene was used as an appropriate control.Cell line HEK293-mir122 was generated by the lentiviral vector-mediated genome integration of the mir122 gene in parental HEK293 cells.The effects of miR122 overexpression on cell growth,transgene expression,and r AAV production were determined.Results:The presence of 122 T sequence significantly reduced transgene expression in the miR122-enriched Huh7 cell line(in vitro),fresh human hepatocytes(ex vivo),and mouse liver(in vivo).Also,the normal liver physiology was unaffected by delivery of 122 T sequence by r AAV vectors.Compared with the parental cells,the miR122-overexpressing HEK293-mir122 cell line showed similar cell growth rate and expression of transgene without 122 T,as well as the ability to produce liver-targeting r AAV vectors.Fascinatingly,the yield of r AAV vectors carrying the tcs-122 T gene was increased by 77.7-fold in HEK293-mir122 cells.Moreover,the tcs-122 T-containing r AAV vectors significantly reduced the proliferation of hepatocellular carcinoma cells without affecting the normal liver cells.Conclusion:HEK293-mir122 cells along with the 122 T sequence provide a potential tool to attenuate the cytotoxic transgene expression,such as tcs,during r AAV vector production.
基金Supported by Agencia Nacional de Promoción Científicay Tecnológica,No.PICT 2014-0432,No.PICT 2014-1816 and No.PICT 2015-0551
文摘This review intends to uncover how information from large-scale genetic profiling(whole genome sequencing, and whole exome sequencing) of nonalcoholic fatty liver disease(NAFLD), as well as information from circulating transcriptomics(cell-free mi RNAs) and metabolomics, contributes to the understanding of NAFLD pathogenesis. A further aim is to address the question of whether OMICs information is ready to be implemented in the clinics. The available evidence suggests that any new knowledge pertaining to molecular signatures associated with NAFLD and nonalcoholic steatohepatitis should be promptly translated into the clinical setting. Nevertheless, rigorous steps that must include validation and replication are mandatory before utilizing OMICs biomarkers in diagnostics to identify patients at risk of advanced disease, including liver cancer.
文摘乙型肝炎病毒中的功能蛋白乙肝病毒X蛋白(Hepatitis B virus X protein,HBx)在促进肝细胞恶性改变中起到重要作用,但目前HBx调控肝癌细胞生长的具体机制仍未完全阐明。miR-122是具有抑癌特性的一类miR,在乙肝相关肝癌中表达减少。为了研究HBx通过微小RNA(microRNA,miR)-122调节肝癌细胞增殖及细胞周期的作用,本研究培养肝癌HepG2细胞株并进行分组,NC组转染NC慢病毒载体、HBx组转染HBx慢病毒载体、HBx+NC模拟物组转染HBx慢病毒载体及NC模拟物、HBx+miR-122模拟物组转染HBx慢病毒载体及miR-122模拟物、NC模拟物组转染NC模拟物、miR-122模拟物组:转染miR-122模拟物。通过MTS法检测细胞增殖活力,流式细胞术检测细胞周期,PCR检测miR-122表达量,western blot检测细胞周期蛋白G1(CyclinG1)、X连锁凋亡抑制蛋白(XIAP)、β-连环蛋白(β-catenin)的表达量。结果显示HBx组细胞的OD值、细胞周期G2/M期比例及细胞中CyclinG1、XIAP、β-catenin的表达量均明显高于NC组(P<0.05),细胞周期G0/G1期、S期比例及细胞中miR-122表达量均明显低于NC组(P<0.05);HBx+miR-122模拟物组细胞的OD值、细胞周期G2/M期比例及细胞中CyclinG1、XIAP、β-catenin的表达量均明显低于HBx+NC模拟物组(P<0.05),细胞周期G0/G1期、S期比例及细胞中miR-122表达量均明显高于HBx+NC模拟物组(P<0.05);miR-122模拟物组CyclinG1、XIAP、β-catenin荧光素酶报告基因的荧光活性明显低于NC模拟物组(P<0.05)。本研究结果充分说明HBx能够增强肝癌细胞的增殖活力及明显加速细胞周期,且该作用部分由miR-122的下调所介导。本研究首次阐明了HBx调节肝癌细胞生长的分子机制,也初步探明了具有抑癌活性的miR-122在肝癌细胞中可能靶向CyclinG1、XIAP、β-catenin等基因。
