目的探究微小RNA-195-5p(microRNA-195-5p,miR-195-5p)对心房颤动(atrial fibrillation,AF)大鼠心肌纤维化的影响与机制。方法选择雄性SD大鼠72只,随机分为对照组、AF组、阴性对照组、miR-195-5p组(miR-195-5p抑制剂)、9型重组腺相关病...目的探究微小RNA-195-5p(microRNA-195-5p,miR-195-5p)对心房颤动(atrial fibrillation,AF)大鼠心肌纤维化的影响与机制。方法选择雄性SD大鼠72只,随机分为对照组、AF组、阴性对照组、miR-195-5p组(miR-195-5p抑制剂)、9型重组腺相关病毒(recombinant adeno-associated virus serotype 9,rAAV9)组(miR-195-5p抑制剂+rAAV9-阴性对照)、联合组[miR-195-5p抑制剂+rAAV9-小干扰RNA-SMAD同源物(SMAD homolog,Smad)]7,每组12只。除对照组外,其他组大鼠构建AF模型。给予对应干预措施后,进行心电图测试,记录AF发生率和持续时间;HE染色检测心肌组织病理变化;Masson染色检测心肌组织纤维化程度;实时荧光定量聚合酶链反应检测心肌组织miR-195-5p、Smad7mRNA表达;Western blot检测心肌组织转化生长因子β_(1)(transforming growth factor-β_(1),TGF-β_(1))、Smad2、磷酸化Smad2、Smad3、磷酸化Smad3、Smad7、Ⅰ型胶原蛋白(Collagen-Ⅰ)、Ⅲ型胶原蛋白(Collagen-Ⅲ)表达;双荧光素酶实验验证miR-195-5p对Smad7的调控作用。结果与对照组比较,AF组AF发生率(75.0%vs 0)和持续时间[(27.02±2.65)s vs 0s]、胶原容积分数[(14.47±0.89)%vs(2.12±0.35)%]、心肌组织miR-195-5p(3.27±0.21 vs 1.00±0.10)、TGF-β_(1)(0.76±0.08 vs 0.23±0.04)、Collagen-Ⅰ(0.58±0.07 vs 0.20±0.04)、Collagen-Ⅲ(0.46±0.05 vs 0.11±0.02)、磷酸化Smad2/Smad2(0.92±0.10 vs 0.37±0.05)、磷酸化Smad3/Smad3(0.65±0.06 vs 0.14±0.03)表达明显升高,Smad7mRNA(0.32±0.06 vs 1.02±0.09)和Smad7(0.19±0.03 vs 0.58±0.07)表达明显降低,差异有统计学意义(P<0.05);与AF组和阴性对照组比较,miR-195-5p组AF发生率和持续时间、胶原容积分数、心肌组织miR-195-5p、TGF-β_(1)、Collagen-Ⅰ、Collagen-Ⅲ、磷酸化Smad2/Smad2和磷酸化Smad3/Smad3表达明显降低,Smad7mRNA和蛋白表达明显升高,差异有统计学意义(P<0.05);与miR-195-5p组和rAAV9组比较,联合组AF发生率和持续时间、胶原容积分数、心肌组织TGF-β_(1)、Collagen-Ⅰ、Collagen-Ⅲ、磷酸化Smad2/Smad2和磷酸化Smad3/Smad3表达明显升高,Smad7mRNA和Smad7表达明显降低,差异有统计学意义(P<0.05)。结论下调miR-195-5p可能靶向Smad7抑制TGF-β_(1)信号传导,从而减轻AF心肌纤维化。展开更多
BACKGROUND Shifting from the inflammatory to the proliferative phase represents a pivotal step during managing diabetic foot ulcers(DFUs);however,existing medical interventions remain insufficient.MicroRNAs(miRs)highl...BACKGROUND Shifting from the inflammatory to the proliferative phase represents a pivotal step during managing diabetic foot ulcers(DFUs);however,existing medical interventions remain insufficient.MicroRNAs(miRs)highlight notable capacity for accelerating the repair process of DFUs.Previous research has demonstrated which miR-122-5p regulates matrix metalloproteinases under diabetic conditions,thereby influencing extracellular matrix dynamics.AIM To investigate the impact of miR-122-5p on the transition from the inflammatory to the proliferative stage in DFU.METHODS Analysis for miR-122-5p expression in skin tissues from diabetic ulcer patients and mice was analyzed using quantitative real-time polymerase chain reaction(qRT-PCR).A diabetic wound healing model induced by streptozotocin was used,with mice receiving intradermal injections of adeno-associated virus-DJ encoding empty vector or miR-122.Skin tissues were retrieved at 3,7,and 14 days after injury for gene expression analysis,histology,immunohistochemistry,and network studies.The study explored miR-122-5p’s role in macrophage-fibroblast interactions and its effect on transitioning from inflammation to proliferation in DFU healing.RESULTS High-throughput sequencing revealed miR-122-5p as crucial for DFU healing.qRT-PCR showed significant upregulation of miR-122-5p within diabetic skin among DFU individuals and mice.Western blot,along with immunohistochemical and enzyme-linked immunosorbent assay,demonstrating the upregulation of inflammatory mediators(hypoxia inducible factor-1α,matrix metalloproteinase 9,tumor necrosis factor-α)and reduced fibrosis markers(fibronectin 1,α-smooth muscle actin)by targeting vascular endothelial growth factor.Fluorescence in situ hybridization indicated its expression localized to epidermal keratinocytes and fibroblasts in diabetic mice.Immunofluorescence revealed enhanced increased presence of M1 macrophages and reduced M2 polarization,highlighting its role in inflammation.MiR-122-5p elevated inflammatory cytokine levels while suppressing fibrotic activity from fibroblasts exposed to macrophage-derived media,highlighting its pivotal role in regulating DFU healing.CONCLUSION MiR-122-5p impedes cutaneous healing of diabetic mice via enhancing inflammation and inhibiting fibrosis,offering insights into miR roles in human skin wound repair.展开更多
Elemene is widely recognized as an effective anti-cancer compound and is routinely administered in Chinese clinical settings for the management of several solid tumors,including non-small cell lung cancer(NSCLC).Howev...Elemene is widely recognized as an effective anti-cancer compound and is routinely administered in Chinese clinical settings for the management of several solid tumors,including non-small cell lung cancer(NSCLC).However,its detailed molecular mechanism has not been adequately demonstrated.In this research,it was demonstrated that elemene effectively curtailed NSCLC growth in the patient-derived xenograft(PDX)model.Mechanistically,employing high-throughput screening techniques and subsequent biochemical validations such as microscale thermophoresis(MST),microRNA-145-5p(miR-145-5p)was pinpointed as a critical target through which elemene exerts its anti-tumor effects.Interestingly,elemene serves as a binding stabilizer for miR-145-5p,demonstrating a strong binding affinity(dissociation constant(KD)=0.39±0.17μg/mL)and preventing its degradation both in vitro and in vivo,while not interfering with the synthesis of the primary microRNA transcripts(pri-miRNAs)and precursor miRNAs(pre-miRNAs).The stabilization of miR-145-5p by elemene resulted in an increased level of this miRNA,subsequently suppressing NSCLC progression through the miR-145-5p/mitogen-activated protein kinase kinase kinase 3(MAP3K3)/nuclear factor kappaB(NF-κB)pathway.Our findings provide a new perspective on revealing the interaction patterns between clinical anti-tumor drugs and miRNAs.展开更多
文摘目的探究微小RNA-195-5p(microRNA-195-5p,miR-195-5p)对心房颤动(atrial fibrillation,AF)大鼠心肌纤维化的影响与机制。方法选择雄性SD大鼠72只,随机分为对照组、AF组、阴性对照组、miR-195-5p组(miR-195-5p抑制剂)、9型重组腺相关病毒(recombinant adeno-associated virus serotype 9,rAAV9)组(miR-195-5p抑制剂+rAAV9-阴性对照)、联合组[miR-195-5p抑制剂+rAAV9-小干扰RNA-SMAD同源物(SMAD homolog,Smad)]7,每组12只。除对照组外,其他组大鼠构建AF模型。给予对应干预措施后,进行心电图测试,记录AF发生率和持续时间;HE染色检测心肌组织病理变化;Masson染色检测心肌组织纤维化程度;实时荧光定量聚合酶链反应检测心肌组织miR-195-5p、Smad7mRNA表达;Western blot检测心肌组织转化生长因子β_(1)(transforming growth factor-β_(1),TGF-β_(1))、Smad2、磷酸化Smad2、Smad3、磷酸化Smad3、Smad7、Ⅰ型胶原蛋白(Collagen-Ⅰ)、Ⅲ型胶原蛋白(Collagen-Ⅲ)表达;双荧光素酶实验验证miR-195-5p对Smad7的调控作用。结果与对照组比较,AF组AF发生率(75.0%vs 0)和持续时间[(27.02±2.65)s vs 0s]、胶原容积分数[(14.47±0.89)%vs(2.12±0.35)%]、心肌组织miR-195-5p(3.27±0.21 vs 1.00±0.10)、TGF-β_(1)(0.76±0.08 vs 0.23±0.04)、Collagen-Ⅰ(0.58±0.07 vs 0.20±0.04)、Collagen-Ⅲ(0.46±0.05 vs 0.11±0.02)、磷酸化Smad2/Smad2(0.92±0.10 vs 0.37±0.05)、磷酸化Smad3/Smad3(0.65±0.06 vs 0.14±0.03)表达明显升高,Smad7mRNA(0.32±0.06 vs 1.02±0.09)和Smad7(0.19±0.03 vs 0.58±0.07)表达明显降低,差异有统计学意义(P<0.05);与AF组和阴性对照组比较,miR-195-5p组AF发生率和持续时间、胶原容积分数、心肌组织miR-195-5p、TGF-β_(1)、Collagen-Ⅰ、Collagen-Ⅲ、磷酸化Smad2/Smad2和磷酸化Smad3/Smad3表达明显降低,Smad7mRNA和蛋白表达明显升高,差异有统计学意义(P<0.05);与miR-195-5p组和rAAV9组比较,联合组AF发生率和持续时间、胶原容积分数、心肌组织TGF-β_(1)、Collagen-Ⅰ、Collagen-Ⅲ、磷酸化Smad2/Smad2和磷酸化Smad3/Smad3表达明显升高,Smad7mRNA和Smad7表达明显降低,差异有统计学意义(P<0.05)。结论下调miR-195-5p可能靶向Smad7抑制TGF-β_(1)信号传导,从而减轻AF心肌纤维化。
基金Supported by the National Natural Science Foundation of China,No.82274528.
文摘BACKGROUND Shifting from the inflammatory to the proliferative phase represents a pivotal step during managing diabetic foot ulcers(DFUs);however,existing medical interventions remain insufficient.MicroRNAs(miRs)highlight notable capacity for accelerating the repair process of DFUs.Previous research has demonstrated which miR-122-5p regulates matrix metalloproteinases under diabetic conditions,thereby influencing extracellular matrix dynamics.AIM To investigate the impact of miR-122-5p on the transition from the inflammatory to the proliferative stage in DFU.METHODS Analysis for miR-122-5p expression in skin tissues from diabetic ulcer patients and mice was analyzed using quantitative real-time polymerase chain reaction(qRT-PCR).A diabetic wound healing model induced by streptozotocin was used,with mice receiving intradermal injections of adeno-associated virus-DJ encoding empty vector or miR-122.Skin tissues were retrieved at 3,7,and 14 days after injury for gene expression analysis,histology,immunohistochemistry,and network studies.The study explored miR-122-5p’s role in macrophage-fibroblast interactions and its effect on transitioning from inflammation to proliferation in DFU healing.RESULTS High-throughput sequencing revealed miR-122-5p as crucial for DFU healing.qRT-PCR showed significant upregulation of miR-122-5p within diabetic skin among DFU individuals and mice.Western blot,along with immunohistochemical and enzyme-linked immunosorbent assay,demonstrating the upregulation of inflammatory mediators(hypoxia inducible factor-1α,matrix metalloproteinase 9,tumor necrosis factor-α)and reduced fibrosis markers(fibronectin 1,α-smooth muscle actin)by targeting vascular endothelial growth factor.Fluorescence in situ hybridization indicated its expression localized to epidermal keratinocytes and fibroblasts in diabetic mice.Immunofluorescence revealed enhanced increased presence of M1 macrophages and reduced M2 polarization,highlighting its role in inflammation.MiR-122-5p elevated inflammatory cytokine levels while suppressing fibrotic activity from fibroblasts exposed to macrophage-derived media,highlighting its pivotal role in regulating DFU healing.CONCLUSION MiR-122-5p impedes cutaneous healing of diabetic mice via enhancing inflammation and inhibiting fibrosis,offering insights into miR roles in human skin wound repair.
基金supported by the National Natural Science Foundation of China(Grant No.:82225048)the Dalian Science and Technology Leading Talents Project,China(Grant No.:2019RD15)Sanming Project of Medicine in Shenzhen,China(Grant No.:SZZYSM202106004).
文摘Elemene is widely recognized as an effective anti-cancer compound and is routinely administered in Chinese clinical settings for the management of several solid tumors,including non-small cell lung cancer(NSCLC).However,its detailed molecular mechanism has not been adequately demonstrated.In this research,it was demonstrated that elemene effectively curtailed NSCLC growth in the patient-derived xenograft(PDX)model.Mechanistically,employing high-throughput screening techniques and subsequent biochemical validations such as microscale thermophoresis(MST),microRNA-145-5p(miR-145-5p)was pinpointed as a critical target through which elemene exerts its anti-tumor effects.Interestingly,elemene serves as a binding stabilizer for miR-145-5p,demonstrating a strong binding affinity(dissociation constant(KD)=0.39±0.17μg/mL)and preventing its degradation both in vitro and in vivo,while not interfering with the synthesis of the primary microRNA transcripts(pri-miRNAs)and precursor miRNAs(pre-miRNAs).The stabilization of miR-145-5p by elemene resulted in an increased level of this miRNA,subsequently suppressing NSCLC progression through the miR-145-5p/mitogen-activated protein kinase kinase kinase 3(MAP3K3)/nuclear factor kappaB(NF-κB)pathway.Our findings provide a new perspective on revealing the interaction patterns between clinical anti-tumor drugs and miRNAs.
