Objective To investigate the role and molecular mechanism of exosomal miR-224-5p in colorectal cancer(CRC).Methods The miR-224-5p expression in CRC patient tissues and cell-derived exosomes was measured by laser captu...Objective To investigate the role and molecular mechanism of exosomal miR-224-5p in colorectal cancer(CRC).Methods The miR-224-5p expression in CRC patient tissues and cell-derived exosomes was measured by laser capture microdissection and qRT-PCR,respectively.Dual-luciferase reporter gene assay was used to determine the target gene of miR-224-5p.The protein expressions of p53 and unc-51 like kinase 2(ULK2)in CRC cells were detected by western blot.Flow cytometry was used to detect cell cycle and apoptosis.Cell proliferation was measured by CCK8 and EdU assay.Results The miR-224-5p expression was upregulated in CRC tissues and increased progressively with the rise of CRC stage.CRC cells secreted extracellular miR-224-5p mainly in an exosome-dependent manner,and then miR-224-5p could be transferred to surrounding tumor cells to regulate cell proliferation in the form of autocrine or paracrine.Moreover,ULK2 was characterized as a direct target of miR-224-5p and was downregulated in CRC tissues.Interestingly,ULK2 inhibited CRC cell proliferation in a p53-dependent manner.Furthermore,exosome-derived miR-224-5p partially reversed the proliferation regulation of ULK2 on CRC cells.Conclusion Our findings demonstrate that exosome-transmitted miR-224-5p promotes p53-dependent cell proliferation by targeting ULK2 in CRC,which may offer promising targets for CRC prevention and therapy.展开更多
目的:检测miR-224与miR-135a两种microRNA(miRNA)在非小细胞肺癌中的表达,探讨其与肺癌临床病理的关系。方法:采用Real time RT-PCR法对31例非小细胞肺癌组织及癌旁正常肺组织的miR-224与miR-135a进行定量分析,结果由2(-△△CT)处理,并...目的:检测miR-224与miR-135a两种microRNA(miRNA)在非小细胞肺癌中的表达,探讨其与肺癌临床病理的关系。方法:采用Real time RT-PCR法对31例非小细胞肺癌组织及癌旁正常肺组织的miR-224与miR-135a进行定量分析,结果由2(-△△CT)处理,并分析与临床病理资料的关系。结果:相对内参U6,miR-224在非小细胞肺癌组织中表达量为4.2761±0.8731,在正常肺组织中的表达量为0.8967±0.2154,两者相比P<0.05,miR-135a在非小细胞肺癌组织中表达量为0.3551±0.0985,在正常肺组织中的表达量为1.7443±0.3125,两者相比P<0.05。miR-224与miR-135a的表达与非小细胞肺癌的临床分期、病理分级密切相关。结论:miR-224高表达及miR-135a低表达与非小细胞肺癌的临床分期、病理分级密切相关,miR-224有可能作为非小细胞肺癌的重要肿瘤标志物。展开更多
基金supported by the National Natural Science Foundation of China[Grant Number:81972803]。
文摘Objective To investigate the role and molecular mechanism of exosomal miR-224-5p in colorectal cancer(CRC).Methods The miR-224-5p expression in CRC patient tissues and cell-derived exosomes was measured by laser capture microdissection and qRT-PCR,respectively.Dual-luciferase reporter gene assay was used to determine the target gene of miR-224-5p.The protein expressions of p53 and unc-51 like kinase 2(ULK2)in CRC cells were detected by western blot.Flow cytometry was used to detect cell cycle and apoptosis.Cell proliferation was measured by CCK8 and EdU assay.Results The miR-224-5p expression was upregulated in CRC tissues and increased progressively with the rise of CRC stage.CRC cells secreted extracellular miR-224-5p mainly in an exosome-dependent manner,and then miR-224-5p could be transferred to surrounding tumor cells to regulate cell proliferation in the form of autocrine or paracrine.Moreover,ULK2 was characterized as a direct target of miR-224-5p and was downregulated in CRC tissues.Interestingly,ULK2 inhibited CRC cell proliferation in a p53-dependent manner.Furthermore,exosome-derived miR-224-5p partially reversed the proliferation regulation of ULK2 on CRC cells.Conclusion Our findings demonstrate that exosome-transmitted miR-224-5p promotes p53-dependent cell proliferation by targeting ULK2 in CRC,which may offer promising targets for CRC prevention and therapy.
文摘目的:检测miR-224与miR-135a两种microRNA(miRNA)在非小细胞肺癌中的表达,探讨其与肺癌临床病理的关系。方法:采用Real time RT-PCR法对31例非小细胞肺癌组织及癌旁正常肺组织的miR-224与miR-135a进行定量分析,结果由2(-△△CT)处理,并分析与临床病理资料的关系。结果:相对内参U6,miR-224在非小细胞肺癌组织中表达量为4.2761±0.8731,在正常肺组织中的表达量为0.8967±0.2154,两者相比P<0.05,miR-135a在非小细胞肺癌组织中表达量为0.3551±0.0985,在正常肺组织中的表达量为1.7443±0.3125,两者相比P<0.05。miR-224与miR-135a的表达与非小细胞肺癌的临床分期、病理分级密切相关。结论:miR-224高表达及miR-135a低表达与非小细胞肺癌的临床分期、病理分级密切相关,miR-224有可能作为非小细胞肺癌的重要肿瘤标志物。
