Age-related osteoporosis is associated with the reduced capacity of bone marrow mesenchymal stem cells （BMSCs） to differentiate into osteoblasts instead of adipocytes. However, the molecular mechanisms that decide t...Age-related osteoporosis is associated with the reduced capacity of bone marrow mesenchymal stem cells （BMSCs） to differentiate into osteoblasts instead of adipocytes. However, the molecular mechanisms that decide the fate of BMSCs remain unclear. In our study, microRNA-23a, and microRNA-23b （miR-23a/b） were found to be markedly downregulated in BMSCs of aged mice and humans. The overexpression of miR-23a/b in BMSCs promoted osteogenic differentiation, whereas the inhibition of miR-23a/b increased adipogenic differentiation. Transmembrane protein 64 （Tmem64）, which has expression levels inversely related to those of miR-23a/b in aged and young mice, was identified as a major target of miR-23a/b during BMSC differentiation. In conclusion, our study suggests that miR-23a/b has a critical role in the regulation of mesenchymal lineage differentiation through the suppression of Tmem64.展开更多
目的研究miR-23a和miR-23b在非小细胞肺癌中的表达特征,并探讨其临床意义。方法收集157例非小细胞肺癌手术切除标本及50例癌旁组织标本,采用Real time PCR方法检测miR-23a和miR-23b在非小细胞肺癌及其癌旁组织中的表达,分析二者表达的...目的研究miR-23a和miR-23b在非小细胞肺癌中的表达特征,并探讨其临床意义。方法收集157例非小细胞肺癌手术切除标本及50例癌旁组织标本,采用Real time PCR方法检测miR-23a和miR-23b在非小细胞肺癌及其癌旁组织中的表达,分析二者表达的相关性,并探讨其表达与临床病理特征及其预后的关系。结果 miR-23a和miR-23b在非小细胞肺癌组织中的表达水平均高于癌旁肺组织,二者在非小细胞肺癌组织中表达呈正相关(r=0.351,P<0.001)。miR-23a和miR-23b联合高表达与淋巴结有无转移(P<0.001)、远处转移(P=0.001)及临床分期(P=0.002)相关,而与年龄、性别、组织类型及组织分化程度无显著相关性(P>0.05)。KaplanMeier分析显示miR-23a和miR-23b联合高表达组患者生存期显著低于单独高表达组或联合低表达组(P=0.009),Cox风险比例模型分析显示miR-23a和miR-23b联合高表达为非小细胞肺癌患者的危险因素。结论 miR-23a和miR-23b在非小细胞肺癌中异常高表达可能是潜在的肺癌预后分子标志物。展开更多
Our previous studies showed that miR-23b was downregulated in patients with intracerebral hemorrhage(ICH). This indicates that miR-23b may be closely related to the patho-physiological mechanism of ICH, but this hypot...Our previous studies showed that miR-23b was downregulated in patients with intracerebral hemorrhage(ICH). This indicates that miR-23b may be closely related to the patho-physiological mechanism of ICH, but this hypothesis lacks direct evidence. In this study, we established rat models of ICH by injecting collagenase Ⅶ into the right basal ganglia and treating them with an injection of bone marrow mesenchymal stem cell(BMSC)-derived exosomal miR-23b via the tail vein. We found that edema in the rat brain was markedly reduced and rat behaviors were improved after BMSC exosomal miR-23b injection compared with those in the ICH groups. Additionally, exosomal miR-23b was transported to the microglia/macrophages, thereby reducing oxidative stress and pyroptosis after ICH. We also used hemin to mimic ICH conditions in vitro. We found that phosphatase and tensin homolog deleted on chromosome 10(PTEN) was the downstream target gene of miR-23b, and exosomal miR-23b exhibited antioxidant effects by regulating the PTEN/Nrf2 pathway. Moreover, miR-23b reduced PTEN binding to NOD-like receptor family pyrin domain containing 3(NLRP3) and NLRP3 inflammasome activation, thereby decreasing the NLRP3-dependent pyroptosis level. These findings suggest that BMSC-derived exosomal miR-23b exhibits antioxidant effects through inhibiting PTEN and alleviating NLRP3 inflammasome-mediated pyroptosis, thereby promoting neurologic function recovery in rats with ICH.展开更多
口腔癌转移是威胁全世界生命健康的问题,有效的靶向治疗对口腔癌患者尤为重要.近年来,microRNA(miRNA)作为一种微小的非编码RNA在肿瘤转移中发挥着重要的作用,因此,开展了体外探究miR-23b在口腔癌转移中的作用.利用实时荧光定量核酸扩...口腔癌转移是威胁全世界生命健康的问题,有效的靶向治疗对口腔癌患者尤为重要.近年来,microRNA(miRNA)作为一种微小的非编码RNA在肿瘤转移中发挥着重要的作用,因此,开展了体外探究miR-23b在口腔癌转移中的作用.利用实时荧光定量核酸扩增检测系统(qRT-PCR)检测了miR-23b在口腔正常细胞和口腔癌细胞中的表达差异,结果显示miR-23b在口腔癌细胞中的表达明显高于口腔正常细胞中的表达,且随着口腔癌转移程度的增加而增高( P <0.05).在此基础上,通过给细胞转染miR-23b mimics的方法过表达miR-23b,以探究该miRNA对口腔癌转移的作用.实验结果发现,增加口腔原位癌细胞Um-2中miR-23b的表达后,该细胞的转移能力显著增强,表明miR-23b在口腔癌转移中发挥着重要作用,可能成为临床口腔癌的治疗靶点和口腔癌检测标志物.展开更多
文摘Age-related osteoporosis is associated with the reduced capacity of bone marrow mesenchymal stem cells （BMSCs） to differentiate into osteoblasts instead of adipocytes. However, the molecular mechanisms that decide the fate of BMSCs remain unclear. In our study, microRNA-23a, and microRNA-23b （miR-23a/b） were found to be markedly downregulated in BMSCs of aged mice and humans. The overexpression of miR-23a/b in BMSCs promoted osteogenic differentiation, whereas the inhibition of miR-23a/b increased adipogenic differentiation. Transmembrane protein 64 （Tmem64）, which has expression levels inversely related to those of miR-23a/b in aged and young mice, was identified as a major target of miR-23a/b during BMSC differentiation. In conclusion, our study suggests that miR-23a/b has a critical role in the regulation of mesenchymal lineage differentiation through the suppression of Tmem64.
文摘目的研究miR-23a和miR-23b在非小细胞肺癌中的表达特征,并探讨其临床意义。方法收集157例非小细胞肺癌手术切除标本及50例癌旁组织标本,采用Real time PCR方法检测miR-23a和miR-23b在非小细胞肺癌及其癌旁组织中的表达,分析二者表达的相关性,并探讨其表达与临床病理特征及其预后的关系。结果 miR-23a和miR-23b在非小细胞肺癌组织中的表达水平均高于癌旁肺组织,二者在非小细胞肺癌组织中表达呈正相关(r=0.351,P<0.001)。miR-23a和miR-23b联合高表达与淋巴结有无转移(P<0.001)、远处转移(P=0.001)及临床分期(P=0.002)相关,而与年龄、性别、组织类型及组织分化程度无显著相关性(P>0.05)。KaplanMeier分析显示miR-23a和miR-23b联合高表达组患者生存期显著低于单独高表达组或联合低表达组(P=0.009),Cox风险比例模型分析显示miR-23a和miR-23b联合高表达为非小细胞肺癌患者的危险因素。结论 miR-23a和miR-23b在非小细胞肺癌中异常高表达可能是潜在的肺癌预后分子标志物。
基金supported by the National Natural Science Foundation of China,No.81571120(to ZYH).
文摘Our previous studies showed that miR-23b was downregulated in patients with intracerebral hemorrhage(ICH). This indicates that miR-23b may be closely related to the patho-physiological mechanism of ICH, but this hypothesis lacks direct evidence. In this study, we established rat models of ICH by injecting collagenase Ⅶ into the right basal ganglia and treating them with an injection of bone marrow mesenchymal stem cell(BMSC)-derived exosomal miR-23b via the tail vein. We found that edema in the rat brain was markedly reduced and rat behaviors were improved after BMSC exosomal miR-23b injection compared with those in the ICH groups. Additionally, exosomal miR-23b was transported to the microglia/macrophages, thereby reducing oxidative stress and pyroptosis after ICH. We also used hemin to mimic ICH conditions in vitro. We found that phosphatase and tensin homolog deleted on chromosome 10(PTEN) was the downstream target gene of miR-23b, and exosomal miR-23b exhibited antioxidant effects by regulating the PTEN/Nrf2 pathway. Moreover, miR-23b reduced PTEN binding to NOD-like receptor family pyrin domain containing 3(NLRP3) and NLRP3 inflammasome activation, thereby decreasing the NLRP3-dependent pyroptosis level. These findings suggest that BMSC-derived exosomal miR-23b exhibits antioxidant effects through inhibiting PTEN and alleviating NLRP3 inflammasome-mediated pyroptosis, thereby promoting neurologic function recovery in rats with ICH.
文摘口腔癌转移是威胁全世界生命健康的问题,有效的靶向治疗对口腔癌患者尤为重要.近年来,microRNA(miRNA)作为一种微小的非编码RNA在肿瘤转移中发挥着重要的作用,因此,开展了体外探究miR-23b在口腔癌转移中的作用.利用实时荧光定量核酸扩增检测系统(qRT-PCR)检测了miR-23b在口腔正常细胞和口腔癌细胞中的表达差异,结果显示miR-23b在口腔癌细胞中的表达明显高于口腔正常细胞中的表达,且随着口腔癌转移程度的增加而增高( P <0.05).在此基础上,通过给细胞转染miR-23b mimics的方法过表达miR-23b,以探究该miRNA对口腔癌转移的作用.实验结果发现,增加口腔原位癌细胞Um-2中miR-23b的表达后,该细胞的转移能力显著增强,表明miR-23b在口腔癌转移中发挥着重要作用,可能成为临床口腔癌的治疗靶点和口腔癌检测标志物.
