Gastric cancer(GC)is a prevalent malignant tumor globally,with high incidence and mortality rates.Advances in understanding molecular mechanisms underlying GC have highlighted the role of microRNAs(miRNAs)in its initi...Gastric cancer(GC)is a prevalent malignant tumor globally,with high incidence and mortality rates.Advances in understanding molecular mechanisms underlying GC have highlighted the role of microRNAs(miRNAs)in its initiation,progression,and treatment.The Let-7 family,an important class of miRNAs,is closely associated with the biological behaviors of GC.Aberrant expression of various Let-7 family members in GC patients contributes to disease progression,as they target multiple molecular pathways and participate in diverse regulatory mechanisms throughoutGCpathogenesis.This article systematically summarizes the expression patterns of Let-7 familymembers in GC,explores their influence onGCcell behaviors such as proliferation,invasion,andmetastasis through key target gene regulation,and reviews current advances in Let-7-based interventions forGC treatment.It aims to provide foundational insights for a deeper understanding of Let-7-related mechanisms in GC and optimize therapeutic strategies.展开更多
高迁移率蛋白A2(high mobility group A2,HMGA2)是一种非组蛋白染色体蛋白,参与转录、分化和胚胎发育等生理过程,同时还与许多人类肿瘤的发生发展密切相关。研究表明HMGA2蛋白过表达与垂体瘤侵袭性、级别和大小等有关。Let-7是microRNA...高迁移率蛋白A2(high mobility group A2,HMGA2)是一种非组蛋白染色体蛋白,参与转录、分化和胚胎发育等生理过程,同时还与许多人类肿瘤的发生发展密切相关。研究表明HMGA2蛋白过表达与垂体瘤侵袭性、级别和大小等有关。Let-7是microRNA家族的成员之一,正常生理情况下其与发育、肌肉形成、细胞粘附和基因调节有关,同时还可以调节细胞周期原癌基因RAS、CDC25a、cyclinD。Let-7缺失或低表达后导致HMGA2过表达,从而引起垂体瘤等多种人类肿瘤发生。本文将对let-7与HMGA2的相互关系及它们对垂体瘤的影响做一综述。展开更多
AIM: To establish an accurate and rapid stem-loop reverse transcriptional real-time PCR (RT-PCR) method to quantify human let-7a miRNA in gastric cancer. METHODS: According to the sequence of let-7a miRNA,the stem-loo...AIM: To establish an accurate and rapid stem-loop reverse transcriptional real-time PCR (RT-PCR) method to quantify human let-7a miRNA in gastric cancer. METHODS: According to the sequence of let-7a miRNA,the stem-loop reverse transcriptional primer,the primers and quantitative MGB probes of real-time PCR were designed and synthesized. The dynamic range and the sensitivity of quantitative reverse transcriptional real-time PCR were determined. The levels of let-7a miRNA were examined in 32 gastric carcinoma samples by stem-loop RT-PCR method. RESULTS: The dynamic range and sensitivity of the let-7a miRNA quantification scheme were evaluated,the result showed the assay could precisely detect 10 copies of mature let-7a miRNA in as few as 0.05 ng of total RNA of gastric mucosa. The results of specificity analysis showed no fluorescence signal occurred even though 50 ng of human genomic DNA was added to the reverse transcription (RT) reaction. The expression level of let-7a miRNA in gastric tumor tissues was significantly lower compared to normal tissues in 14 samples from 32 patients. CONCLUSION: The stem-loop RT-PCR is a reliable method to detect let-7a miRNA which may play an important role in the development of gastric carcinoma.展开更多
Vascular atherosclerotic vulnerable plaque rupture is the primary cause of acute myocardial infarctions and strokes. Thus, stabilization of vulnerable plaques is of important clinical endeavor to decrease the fatal ri...Vascular atherosclerotic vulnerable plaque rupture is the primary cause of acute myocardial infarctions and strokes. Thus, stabilization of vulnerable plaques is of important clinical endeavor to decrease the fatal risk of atherosclerosis. Inflammatory infiltration, apoptosis of endothelial cells (ECs) and vascular smooth muscle cells (VSMCs), destruction of extracellular matrix (ECM) or collagen, and neovascularization all contribute to the formation and stability of plaque. Let-7g, one miRNA of let-7 family, is related to retardation of the progress of vulnerable atherosclerosis plaque. First of all, let-7g induced preservation on vascular diseases through regulating on the intracellular Ca2+- activated protein kinase C-oxLDL-LOX-1 pathway, which resulted in reduced leukocyte adhesion to and migration across endothelium. Over expression of let-7g negatively regulated apoptosis in the ECs by targeting lectin-like oxidized LDL receptor-1(LOX-1)/CASP3 expression, therefore made the fibrous cap of plaque integrated and thick, increased the density of vascular atherosclerotic plaque. In addition, let-7g might stabilize the atherosclerotic plaque through other aspects. In this review, we focus on current and potential importance of let-7g on the stabilization of atherosclerosis plaque which might lead to the future development of an alternative strategy of CAD.展开更多
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
基金financed by grants from the Hunan Province Foundation of High-Level Health Talent(225 Program,20231526)the Natural Science Foundation of Hunan Province(2025JJ81050).
文摘Gastric cancer(GC)is a prevalent malignant tumor globally,with high incidence and mortality rates.Advances in understanding molecular mechanisms underlying GC have highlighted the role of microRNAs(miRNAs)in its initiation,progression,and treatment.The Let-7 family,an important class of miRNAs,is closely associated with the biological behaviors of GC.Aberrant expression of various Let-7 family members in GC patients contributes to disease progression,as they target multiple molecular pathways and participate in diverse regulatory mechanisms throughoutGCpathogenesis.This article systematically summarizes the expression patterns of Let-7 familymembers in GC,explores their influence onGCcell behaviors such as proliferation,invasion,andmetastasis through key target gene regulation,and reviews current advances in Let-7-based interventions forGC treatment.It aims to provide foundational insights for a deeper understanding of Let-7-related mechanisms in GC and optimize therapeutic strategies.
文摘高迁移率蛋白A2(high mobility group A2,HMGA2)是一种非组蛋白染色体蛋白,参与转录、分化和胚胎发育等生理过程,同时还与许多人类肿瘤的发生发展密切相关。研究表明HMGA2蛋白过表达与垂体瘤侵袭性、级别和大小等有关。Let-7是microRNA家族的成员之一,正常生理情况下其与发育、肌肉形成、细胞粘附和基因调节有关,同时还可以调节细胞周期原癌基因RAS、CDC25a、cyclinD。Let-7缺失或低表达后导致HMGA2过表达,从而引起垂体瘤等多种人类肿瘤发生。本文将对let-7与HMGA2的相互关系及它们对垂体瘤的影响做一综述。
文摘AIM: To establish an accurate and rapid stem-loop reverse transcriptional real-time PCR (RT-PCR) method to quantify human let-7a miRNA in gastric cancer. METHODS: According to the sequence of let-7a miRNA,the stem-loop reverse transcriptional primer,the primers and quantitative MGB probes of real-time PCR were designed and synthesized. The dynamic range and the sensitivity of quantitative reverse transcriptional real-time PCR were determined. The levels of let-7a miRNA were examined in 32 gastric carcinoma samples by stem-loop RT-PCR method. RESULTS: The dynamic range and sensitivity of the let-7a miRNA quantification scheme were evaluated,the result showed the assay could precisely detect 10 copies of mature let-7a miRNA in as few as 0.05 ng of total RNA of gastric mucosa. The results of specificity analysis showed no fluorescence signal occurred even though 50 ng of human genomic DNA was added to the reverse transcription (RT) reaction. The expression level of let-7a miRNA in gastric tumor tissues was significantly lower compared to normal tissues in 14 samples from 32 patients. CONCLUSION: The stem-loop RT-PCR is a reliable method to detect let-7a miRNA which may play an important role in the development of gastric carcinoma.
文摘Vascular atherosclerotic vulnerable plaque rupture is the primary cause of acute myocardial infarctions and strokes. Thus, stabilization of vulnerable plaques is of important clinical endeavor to decrease the fatal risk of atherosclerosis. Inflammatory infiltration, apoptosis of endothelial cells (ECs) and vascular smooth muscle cells (VSMCs), destruction of extracellular matrix (ECM) or collagen, and neovascularization all contribute to the formation and stability of plaque. Let-7g, one miRNA of let-7 family, is related to retardation of the progress of vulnerable atherosclerosis plaque. First of all, let-7g induced preservation on vascular diseases through regulating on the intracellular Ca2+- activated protein kinase C-oxLDL-LOX-1 pathway, which resulted in reduced leukocyte adhesion to and migration across endothelium. Over expression of let-7g negatively regulated apoptosis in the ECs by targeting lectin-like oxidized LDL receptor-1(LOX-1)/CASP3 expression, therefore made the fibrous cap of plaque integrated and thick, increased the density of vascular atherosclerotic plaque. In addition, let-7g might stabilize the atherosclerotic plaque through other aspects. In this review, we focus on current and potential importance of let-7g on the stabilization of atherosclerosis plaque which might lead to the future development of an alternative strategy of CAD.
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.
