Background:Oral cancer,a malignancy that is prevalent worldwide,is often diagnosed at an advanced stage.MicroRNAs(miRNAs)in circulating exosomes have emerged as promising cancer biomarkers.The role of miRNA let-7c-5p ...Background:Oral cancer,a malignancy that is prevalent worldwide,is often diagnosed at an advanced stage.MicroRNAs(miRNAs)in circulating exosomes have emerged as promising cancer biomarkers.The role of miRNA let-7c-5p in oral cancer remains underexplored,and its potential involvement in tumorigenesis warrants comprehensive investigation.Methods:Serum samples from 30 patients with oral cancer and 20 healthy controls were used to isolate exosomes and quantify their RNA content.Isolation of the exosomes was confirmed through transmission electron microscopy.Quantitative PCR was used to assess the miRNA profiles.The effects of let-7c-5p and TAGLN overexpression on oral cancer cell viability,migration,and invasion were analyzed via CCK-8 and Transwell assays.Moreover,we conducted mRNA sequencing of exosomal RNA from exosomes overexpressing let-7c-5p to delineate the gene expression profile and identify potential let-7c-5p target genes.Results:let-7c-5p was upregulated in serumderived exosomes of patients with oral cancer.Overexpression of let-7c-5p in the TCA8113 and CAL-27 cell lines enhanced their proliferative,migratory,and invasive capacities,and overexpression of let-7c-5p cell-derived exosomes promoted oral cancer cell invasiveness.Exosomal mRNA sequencing revealed 2,551 differentially expressed genes between control cell-derived exosomes and overexpressed let-7c-5p cell-derived exosomes.We further identified TAGLN as a direct target of let-7c-5p,which has been implicated in modulating the oncogenic potential of oral cancer cells.Overexpression of TAGLN reverses the promoting role of let-7c-5p on oral cancer cells.Conclusion:Our findings highlight the role of exosomal let-7c-5p in enhancing oral cancer cell aggressiveness by downregulating TAGLN expression,highlighting its potential as a diagnostic and therapeutic strategy.展开更多
Gliomas are the most common central nervous system tumours;they are highly aggressive and have a poor prognosis. RGS16 belongs to the regulator of G-protein signalling (RGS) protein family, which plays an important ro...Gliomas are the most common central nervous system tumours;they are highly aggressive and have a poor prognosis. RGS16 belongs to the regulator of G-protein signalling (RGS) protein family, which plays an important role in promoting various cancers, such as breast cancer, pancreatic cancer, and colorectal cancer. Moreover, previous studies confirmed that let-7c-5p, a well-known microRNA, can act as a tumour suppressor to regulate the progression of various tumours by inhibiting the expression of its target genes. However, whether RGS16 can promote the progression of glioma and whether it is regulated by miR let-7c-5p are still unknown. Here, we confirmed that RGS16 is upregulated in glioma tissues and that high expression of RGS16 is associated with poor survival. Ectopic deletion of RGS16 significantly suppressed glioma cell proliferation and migration both in vitro and in vivo. Moreover, RGS16 was validated as a direct target gene of miR let-7c-5p. The overexpression of miR let-7c-5p obviously downregulated the expression of RGS16, and knocking down miR let-7c-5p had the opposite effect. Thus, we suggest that the suppression of RGS16 by miR let-7c-5p can promote glioma progression and may serve as a potential prognostic biomarker and therapeutic target in glioma.展开更多
目的探讨miR-let-7c-5p/c-myc信号轴在白血病细胞定向单核/巨噬细胞分化中的调控作用。方法采用PMA+LPS+IFN-γ诱导THP-1白血病细胞向单核/巨噬细胞定向分化,PBS作为对照组。诱导48 h后CCK8法测定细胞增殖水平;流式细胞仪测定细胞CD11b...目的探讨miR-let-7c-5p/c-myc信号轴在白血病细胞定向单核/巨噬细胞分化中的调控作用。方法采用PMA+LPS+IFN-γ诱导THP-1白血病细胞向单核/巨噬细胞定向分化,PBS作为对照组。诱导48 h后CCK8法测定细胞增殖水平;流式细胞仪测定细胞CD11b与CD14分化抗原表达水平;RT-qPCR检测白血病细胞分化前后miR-let-7c-5p和c-myc的表达变化;蛋白质印迹法检测c-myc蛋白表达变化;双荧光素酶结合实验检测miR-let-7c-5p与c-myc的3′UTR靶向结合和活性调控关系;转染miR-let-7c-5p mimic观察c-myc表达变化后细胞的增殖分化水平变化;过表达c-myc拯救实验观察miR-let-7c-5p对PMA+LPS+IFN-γ诱导的THP-1细胞增殖分化的影响。THP-1细胞转染miR-let-7c-5p inhibitor,观察c-myc表达变化对THP-1定向分化为M1样巨噬细胞的影响。结果与PBS对照组相比,PMA+LPS+IFN-γ诱导48 h后,THP-1细胞的增殖能力明显降低(0.64±0.01 vs 0.33±0.01,t=45.190,P<0.001)。PMA+LPS+IFN-γ实验组的CD11b和CD14平均阳性表达率升高[(5.51±0.89)%vs(17.72±0.86)%,t=17.050,P<0.001;(6.22±0.70)%vs(16.42±0.14)%,t=24.650,P<0.001]。PMA+LPS+IFN-γ实验组的c-myc蛋白表达水平降低(0.87±0.02 vs 0.64±0.06,t=6.041,P=0.004)。PMA+LPS+IFN-γ实验组的miR-let-7c-5p基因表达量高于对照组,而c-myc基因表达量低于对照组,均P<0.001。Luciferase实验证实,miR-let-7c-5p mimic+c-myc-WT组的荧光素酶活性明显低于mimics NC+c-myc-WT组(0.88±0.09 vs 0.62±0.05,t=4.320,P=0.013)。转染miR-let-7c-5p mimic后,miR-let-7c-5p mimic组的c-myc蛋白表达水平低于miR-let-7c-5p mimic NC组(1.03±0.08 vs 0.39±0.07,t=10.420,P<0.001),伴有细胞增殖水平的降低(0.64±0.01 vs 0.42±0.01,t=30.160,P<0.001),CD11b和CD14阳性表达率升高[(2.18±0.53)%vs(22.10±0.87)%,t=33.530,P<0.001;(3.37±0.73)%vs(22.98±5.43)%,t=6.195,P=0.004]。拯救实验结果表明,miR-let-7c-5p mimics+c-myc vector组的c-myc蛋白表达水平高于miR-let-7c-5p mimics组(0.53±0.02 vs 0.84±0.05,t=9.250,P<0.001)。miR-let-7c-5p mimics组的THP-1细胞增殖D值低于miR-let-7c-5p mimics+c-myc vector组(0.62±0.01 vs 0.42±0.01,t=20.330,P<0.001)。miR-let-7c-5p mimics组的平均CD11b、CD14阳性表达率高于miR-let-7c-5p mimics+c-myc vector组[(6.17±0.76)%vs(19.57±5.96)%,t=3.865,P=0.018;(10.36±1.13)%vs(34.89±3.19)%,t=12.56,P<0.001]。miR-let-7c-5p inhibitor干预PMA+LPS+IFN-γ实验组结果显示,与对照组相比较,PMA+LPS+IFN-γ诱导THP-1细胞分化后,c-myc蛋白的表达水平显著降低(0.97±0.05 vs 0.34±0.19,t=5.377,P=0.006),CXCL9、CXCL10、iNOS基因的相对表达水平明显升高,均P<0.001。与PMA+LPS+IFN-γ实验组相比较,PMA+LPS+IFN-γ+miR-let-7c-5p inhibitor组的c-myc蛋白相对表达水平显著升高(0.34±0.06 vs 0.96±0.07,t=11.310,P<0.001),而CXCL9、CXCL10、iNOS基因的相对表达水平明显降低,均P<0.001。结论miR-let-7c-5p可以靶向结合c-myc 3′UTR区,miR-let-7c-5p/c-myc信号轴是白血病细胞定向分化为单核/巨噬细胞的重要途径之一。展开更多
文摘Background:Oral cancer,a malignancy that is prevalent worldwide,is often diagnosed at an advanced stage.MicroRNAs(miRNAs)in circulating exosomes have emerged as promising cancer biomarkers.The role of miRNA let-7c-5p in oral cancer remains underexplored,and its potential involvement in tumorigenesis warrants comprehensive investigation.Methods:Serum samples from 30 patients with oral cancer and 20 healthy controls were used to isolate exosomes and quantify their RNA content.Isolation of the exosomes was confirmed through transmission electron microscopy.Quantitative PCR was used to assess the miRNA profiles.The effects of let-7c-5p and TAGLN overexpression on oral cancer cell viability,migration,and invasion were analyzed via CCK-8 and Transwell assays.Moreover,we conducted mRNA sequencing of exosomal RNA from exosomes overexpressing let-7c-5p to delineate the gene expression profile and identify potential let-7c-5p target genes.Results:let-7c-5p was upregulated in serumderived exosomes of patients with oral cancer.Overexpression of let-7c-5p in the TCA8113 and CAL-27 cell lines enhanced their proliferative,migratory,and invasive capacities,and overexpression of let-7c-5p cell-derived exosomes promoted oral cancer cell invasiveness.Exosomal mRNA sequencing revealed 2,551 differentially expressed genes between control cell-derived exosomes and overexpressed let-7c-5p cell-derived exosomes.We further identified TAGLN as a direct target of let-7c-5p,which has been implicated in modulating the oncogenic potential of oral cancer cells.Overexpression of TAGLN reverses the promoting role of let-7c-5p on oral cancer cells.Conclusion:Our findings highlight the role of exosomal let-7c-5p in enhancing oral cancer cell aggressiveness by downregulating TAGLN expression,highlighting its potential as a diagnostic and therapeutic strategy.
基金the National Natural Science Foundation of China(Nos.81874083,82072776,82072775,81702468,81802966,81902540,81874082,and 81472353)Natural Science Foundation of Shandong Province of China(Nos.ZR2019BH057,ZR2020QH174,and ZR2021LSW025)+3 种基金the Jinan Science and Technology Bureau of Shandong Province(No.2021GXRC029)Key Clinical Research Project of Clinical Research Center of Shandong University(No.2020SDUCRCA011)Taishan Scholars of Shandong Province of China(No.tspd20210322)Scientific Research Foundation of Qilu Hospital(Qingdao)(No.QDKY2019QN03).
文摘Gliomas are the most common central nervous system tumours;they are highly aggressive and have a poor prognosis. RGS16 belongs to the regulator of G-protein signalling (RGS) protein family, which plays an important role in promoting various cancers, such as breast cancer, pancreatic cancer, and colorectal cancer. Moreover, previous studies confirmed that let-7c-5p, a well-known microRNA, can act as a tumour suppressor to regulate the progression of various tumours by inhibiting the expression of its target genes. However, whether RGS16 can promote the progression of glioma and whether it is regulated by miR let-7c-5p are still unknown. Here, we confirmed that RGS16 is upregulated in glioma tissues and that high expression of RGS16 is associated with poor survival. Ectopic deletion of RGS16 significantly suppressed glioma cell proliferation and migration both in vitro and in vivo. Moreover, RGS16 was validated as a direct target gene of miR let-7c-5p. The overexpression of miR let-7c-5p obviously downregulated the expression of RGS16, and knocking down miR let-7c-5p had the opposite effect. Thus, we suggest that the suppression of RGS16 by miR let-7c-5p can promote glioma progression and may serve as a potential prognostic biomarker and therapeutic target in glioma.
文摘目的探讨miR-let-7c-5p/c-myc信号轴在白血病细胞定向单核/巨噬细胞分化中的调控作用。方法采用PMA+LPS+IFN-γ诱导THP-1白血病细胞向单核/巨噬细胞定向分化,PBS作为对照组。诱导48 h后CCK8法测定细胞增殖水平;流式细胞仪测定细胞CD11b与CD14分化抗原表达水平;RT-qPCR检测白血病细胞分化前后miR-let-7c-5p和c-myc的表达变化;蛋白质印迹法检测c-myc蛋白表达变化;双荧光素酶结合实验检测miR-let-7c-5p与c-myc的3′UTR靶向结合和活性调控关系;转染miR-let-7c-5p mimic观察c-myc表达变化后细胞的增殖分化水平变化;过表达c-myc拯救实验观察miR-let-7c-5p对PMA+LPS+IFN-γ诱导的THP-1细胞增殖分化的影响。THP-1细胞转染miR-let-7c-5p inhibitor,观察c-myc表达变化对THP-1定向分化为M1样巨噬细胞的影响。结果与PBS对照组相比,PMA+LPS+IFN-γ诱导48 h后,THP-1细胞的增殖能力明显降低(0.64±0.01 vs 0.33±0.01,t=45.190,P<0.001)。PMA+LPS+IFN-γ实验组的CD11b和CD14平均阳性表达率升高[(5.51±0.89)%vs(17.72±0.86)%,t=17.050,P<0.001;(6.22±0.70)%vs(16.42±0.14)%,t=24.650,P<0.001]。PMA+LPS+IFN-γ实验组的c-myc蛋白表达水平降低(0.87±0.02 vs 0.64±0.06,t=6.041,P=0.004)。PMA+LPS+IFN-γ实验组的miR-let-7c-5p基因表达量高于对照组,而c-myc基因表达量低于对照组,均P<0.001。Luciferase实验证实,miR-let-7c-5p mimic+c-myc-WT组的荧光素酶活性明显低于mimics NC+c-myc-WT组(0.88±0.09 vs 0.62±0.05,t=4.320,P=0.013)。转染miR-let-7c-5p mimic后,miR-let-7c-5p mimic组的c-myc蛋白表达水平低于miR-let-7c-5p mimic NC组(1.03±0.08 vs 0.39±0.07,t=10.420,P<0.001),伴有细胞增殖水平的降低(0.64±0.01 vs 0.42±0.01,t=30.160,P<0.001),CD11b和CD14阳性表达率升高[(2.18±0.53)%vs(22.10±0.87)%,t=33.530,P<0.001;(3.37±0.73)%vs(22.98±5.43)%,t=6.195,P=0.004]。拯救实验结果表明,miR-let-7c-5p mimics+c-myc vector组的c-myc蛋白表达水平高于miR-let-7c-5p mimics组(0.53±0.02 vs 0.84±0.05,t=9.250,P<0.001)。miR-let-7c-5p mimics组的THP-1细胞增殖D值低于miR-let-7c-5p mimics+c-myc vector组(0.62±0.01 vs 0.42±0.01,t=20.330,P<0.001)。miR-let-7c-5p mimics组的平均CD11b、CD14阳性表达率高于miR-let-7c-5p mimics+c-myc vector组[(6.17±0.76)%vs(19.57±5.96)%,t=3.865,P=0.018;(10.36±1.13)%vs(34.89±3.19)%,t=12.56,P<0.001]。miR-let-7c-5p inhibitor干预PMA+LPS+IFN-γ实验组结果显示,与对照组相比较,PMA+LPS+IFN-γ诱导THP-1细胞分化后,c-myc蛋白的表达水平显著降低(0.97±0.05 vs 0.34±0.19,t=5.377,P=0.006),CXCL9、CXCL10、iNOS基因的相对表达水平明显升高,均P<0.001。与PMA+LPS+IFN-γ实验组相比较,PMA+LPS+IFN-γ+miR-let-7c-5p inhibitor组的c-myc蛋白相对表达水平显著升高(0.34±0.06 vs 0.96±0.07,t=11.310,P<0.001),而CXCL9、CXCL10、iNOS基因的相对表达水平明显降低,均P<0.001。结论miR-let-7c-5p可以靶向结合c-myc 3′UTR区,miR-let-7c-5p/c-myc信号轴是白血病细胞定向分化为单核/巨噬细胞的重要途径之一。
