Sister chromatid exchanges in patients with retinoblastoma

Spontaneous and mitomycin C(MMC)-induced sisyer chromatid exchanges were studied in 11 patients with retinoblastoma and 7 normal controls. Spontaneous rates were similar in patients and in controls. The MMC-induced rate was found to be significantly higher in bilaterally affected patients than in controls. It is suggested that this increase may be due to a DNA repair deficiency. However, it is not possible to clarify wether this abnormality is associated with the retinoblastoma gene or with another factor acting on the degree of expressivity of the disease in gene carriers.     

Hemodynamic differences between carvedilol and labetalol in the cutaneous circulation

The effects of labetalol and carvedilol on local cutaneous microvascular perfusion and calculated local cutaneous microvascular resistance were investigated in anesthetized rats at submaximal doses that produced equivalent reductions in blood pressure and heart rate. Labetalol decreased cutaneous perfusion (– 25% ± 3%) without significantly affecting cutaneous vascular resistance ( – 6% ± 3%). In marked contrast, carvedilol dramatically increased cutaneous perfusion ( + 64% ± 9%) and significantly reduced cutaneous vascular resistance ( – 57% ± 3%). These results suggest that carvedilol and labetalol possess differences in the mechanisms by which they produce vasodilation in vivo.     

miR-155通过调控CaSR表达影响VSMC生长的机制研究

目的 miR-155可以通过干扰血管平滑肌细胞(VMSC)生物活性来抑制动脉粥样硬化斑块的形成,但具体机制不十分清楚.本研究主要观察miR-155对VSMC中钙敏感受体(CaSR)表达的影响,同时探讨CaSR在miR-155调控VSMC生物活性过程中的作用.方法 培养VSMC,将miR-155 mimic、Ad-CaS...     

靶向抑制miR-155增加骨髓瘤细胞对化疗药物的敏感性

目的:探讨靶向抑制miR-155对骨髓瘤细胞化疗敏感性的影响,并研究其分子作用机制.方法:利用qRT-PCR测定人骨髓瘤细胞株及耐药株中miR-155的表达水平;利用LipofectamineTM 2000将miR-155 inhibitor和阴性对照转染至人骨髓瘤耐药细胞株中;利用MTT法检测转染后人骨髓瘤耐药细胞对...     

鼻咽癌患者血清中miR-141-3p和miR-155-3p的表达水平及其临床意义

目的:探讨鼻咽癌患者血清中miR-141-3p及miR-155-3p的表达水平及临床意义.方法:选取2017年01月至2020年09月我院收治的95例鼻咽癌患者和45例健康对照组作为研究对象,采用实时荧光定量PCR法检测miR-141-3p及miR-155-3p表达水平.应用受试者工作特征(receiver opera...     

微小RNA-155反义寡核苷酸对乳腺癌MDA—MB-157细胞及裸鼠移植瘤的作用

目的：探讨微小RNA-155（microRNA．155,miR-155）反义寡核苷酸（antisenseoligonucleotide,AS0）对乳腺癌MDA-MB-157细胞增殖、凋亡及裸鼠移植瘤的作用。方法：设计合成化学修饰的miR-155ASO,通过Lipofectamine^TM 2000转染MDA-MB-157细胞,激光共聚焦检测转染率,real-timePCR测定转柒后miR-155表达水平的变化,CCK-8法检测细胞增殖抑制率,流式细胞仪检测细胞凋亡率,观察miR-155ASO对裸鼠成瘤能力的影响,免疫组织化学法检测瘤体组织Caspase-3的表达。结果：激光共聚焦检测转染率达80％以上。转染miR-155AS0后,miR-155表达明显下降,细胞增殖能力降低,凋亡增加。miR-155AS0能明显抑制裸鼠移植瘤生长,抑制率为52．98％,并且能显著增加Caspase-3的表达。结论：miR-155AS0能显著下调miR-155的表达水平,继而抑制乳腺癌MDA-MB-157细胞的增殖,促进其凋亡;并且通过增加靶基因Caspase-3的表达,抑制裸鼠移植瘤的生长,为miR-155作为乳腺癌治疗靶点提供了实验依据。     

miR-155在结肠癌组织中表达的临床病理意义

目的:探讨结肠癌组织及细胞株中microRNA-155(miR-155)表达的临床病理意义.方法:采用RT-qPCR检测40例结肠癌组织及癌旁组织、结肠癌细胞株中miR-155的mRNA的表达,并对其临床病理指标进行分析,分析抑制miR-155表达对结肠癌细胞增殖、克隆形成及凋亡影响.结果:RT-qPCR检测结果表明40例结肠癌组织中miR-155相对表达量明显高于癌旁组织(P<0.01).不同分化结肠癌细胞miR-155相对表达量差异有统计学意义(P<0.05),其中低分化结肠癌细胞中表达均高于中、高分化结肠癌细胞(P<0.05~P<0.01).miR-155的异常高表达与病人肿瘤较大、分化程度差、淋巴结发生转移情况及远处有转移均有关(P<0.05~P<0.01),而与年龄和性别无关(P>0.05).抑制miR-155可明显抑制结肠癌细胞增殖、克隆形成.结论:结肠癌组织中高表达miR-155可以作为预测恶性程度、淋巴转移的有效指标,miR-155在结肠癌病人的临床靶向治疗中具有一定的价值.     

URSA患者绒毛组织中细胞凋亡及血管新生异常与miR-155表达的关系

目的:探究URSA患者绒毛组织中细胞凋亡及血管新生异常与miR-155表达的关系.方法:选择2014年1月~2015年1月来我院妇产科行清宫术后的孕妇的标本64例,其中URSA患者38例,剩余26例,将64例患者按照是否为URSA患者分为两组,即URSA组、对照组.对miR-155的表达量与细胞凋亡分子Bcl-2、Bcl-xl及血管新生分子VEGF、HIF-1α、sFlt-1的表达量记录,并与miR-155的表达量进行对比.结果:miR-155的表达量与细胞凋亡分子Bcl-2、Bcl-xl的表达量呈正相关,与血管新生分子VEGF、HIF-1α的表达量呈正相关,与sFlt-1的表达量呈负相关,且两组患者的miR-155、Bcl-2、Bcl-xl的表达量不同,URSA组显著低于对照组,且URSA组miR-155、VEGF、HIF-1α的表达量显著低于对照组,sFlt-1的表达量则显著高于对照组.结论:URSA绒毛组织中细胞的凋亡及血管新生与miR-155存在关系,且miR-155的表达量下降则会导致绒毛组织中的细胞过度凋亡.     

Th17 cell‐derived miR‐155‐5p modulates interleukin‐17 and suppressor of cytokines signaling 1 expression during the progression of systemic sclerosis

Background miR‐155‐5p is associated with autoimmune diseases. T helper 17 (Th17) cells, interleukin (IL)‐17, and suppressor of cytokines signaling 1 (SOCS1) have important roles in the pathogenesis of systemic sclerosis (SSc). The purpose of this study was to explore the role of miR‐155‐5p in the regulation of IL‐17 and SOCS1 expression in Th17 cells and the subsequent effect on SSc disease progression.MethodsTh17 cells were isolated from peripheral blood mononuclear cells of SSc patients and healthy controls (HCs). RT‐qPCR and western blotting were used to examine the expression patterns of miR‐155‐5p, IL‐17, and SOCS1. Luciferase reporter assays were performed to confirm SOCS1 as a target of miR‐155‐5p. RNA pull‐down assays were performed to detect the interaction of IL‐17 and SOCS1 with miR‐155‐5p. In situ hybridization was performed to analyze the co‐expression pattern of miR‐155‐5p and IL17A in Th17 cells.ResultsThe levels of Th17 cell‐derived miR‐155‐5p were significantly up‐regulated in SSc patients compared with HCs, and its levels were negatively correlated with SOCS1 levels. Meanwhile, miR‐155‐5p positively regulated IL‐17 expression levels in Th17 cells isolated from SSc patients as the disease progressed. Using pmirGLO vectors, SOCS1 was confirmed as a target of miR‐155‐5p. The binding status of IL‐17 and SOCS1 to miR‐155‐5p was related to SSc progression. An increase in the co‐localization of miR‐155‐5p and IL‐17 was associated with greater SSc progression.ConclusionsIL‐17 and SOCS1 expression modulated by Th17 cell‐derived miR‐155‐5p are critical for SSc progression, which may provide novel insights into the pathogenesis of SSc.     

姜黄素下调miR-155抑制缺血性脑卒中炎性应答的实验研究

目的 分析姜黄素对缺血性脑卒中的抗炎作用,并探讨miR-155、Toll样受体4(TLR4)信号通路是否参与该抗炎机制. 方法 线栓法建立Sprague Dawley大鼠大脑中动脉闭塞模型(MCAO),将大鼠分为假手术组(8例)、MCAO模型组(8例)、姜黄素治疗组(8例),检测大鼠梗死体积、miR-155 mRNA相...