肺癌组织中调控PUMA基因 的miRNA筛查和MiR-221表达差异研究

目的 肺癌组织中调控PUMA基因的miRNA筛查并比较MiR-221的表达差异。方法 收集肺癌组织和肺良性病变组织作为研究对象,利用生物学信息分析查询可能调控PUMA的miRNA,应用定制的试剂盒进行初步筛查,并检测miRNA-221在两种组织中的表达情况。结果 根据生物学数据库的分析共筛查出可能调节PUMA的miRNAs有96个; 初步筛查结果显示有10种miRNAs在肺癌组织中表达上调。miR-221进一步验证显示,在肺癌组织中和肺良性病变组织中表达差异有统计学意义(P<0.05),转移与非转移之间表达差异有统计学意义,但与病理组织类型无关。结论 肺癌组织中与PUMA基因相关的10种miRNAs表达上调,提示这些miRNA可能参与PUMA基因的表达调控及肺癌的发生发展有关。miRNA-221在肺癌组织中表达与是否转移有关。     

miR-22修饰的骨髓间充质干细胞外泌体抑制急性心肌梗死大鼠心肌细胞凋亡

目的探讨miR-22修饰的骨髓间充质干细胞(BMSCs)外泌体对急性心肌梗死(AMI)大鼠心肌细胞凋亡的作用及其机制。方法扩增培养从SD大鼠骨髓中分离的BMSCs,将携带miR-22重组慢病毒载体及其阴性对照(miR-NC)载体分别转染至BMSCs,并提取转染后BMSCs的外泌体。将60只SD大鼠随机分为Sham组、AMI组、Exo BMSCs组、Exo BMSCs/miR-NC组和Exo BMSCs/miR-22组,每组12只。采用冠状动脉左前降支结扎术构建AMI大鼠模型,于心肌梗死区原位注射外泌体进行干预。干预72 h后,采用超声心动图监测大鼠心脏功能;TTC染色观察大鼠心肌梗死情况;TUNEL染色观察心肌细胞凋亡水平;qRT-PCR检测心肌组织中miR-22及p53 mRNA表达水平;Western blot检测心肌组织中B淋巴细胞瘤-2(Bcl-2)、Bcl-2相关X蛋白(Bax)、天冬氨酸特异性半胱氨酸蛋白酶剪切体(Cleaved-caspase-3)及p53蛋白表达水平。结果与Sham组比较,AMI组大鼠心脏功能明显降低(P <0.05),心肌梗死面积(%:1.16±0.84 vs.38.68±5.31)和心肌细胞凋亡率(%:9.04±1.95 vs.66.70±5.92)明显增加(P <0.05),心肌组织中miR-22和Bcl-2蛋白表达水平明显降低(P <0.05),而p53、Bax和Cleavedcaspase-3等蛋白表达水平明显升高(P <0.05);与AMI组比较,各外泌体干预组大鼠心功能明显改善(P <0.05),心肌梗死面积(%:38.68±5.31 vs.23.54±3.94,22.33±4.12,13.79±2.25)和心肌细胞凋亡率(66.70±5.92 vs.43.73±3.39,42.67±2.87,30.73±2.97)明显降低(P <0.05),心肌组织中miR-22以及Bcl-2蛋白表达水平明显升高(P <0.05),而p53、Bax和Cleaved-caspase-3等蛋白表达水平明显降低(P <0.05),其中Exo BMSCs/miR-22组大鼠各指标改善情况均优于Exo BMSCs组和Exo BMSCs/miR-NC组。结论 miR-22修饰的BMSCs外泌体可有效抑制p53介导的心肌细胞凋亡,从而改善AMI大鼠的心功能。     

miR-184 functions as an oncogenic regulator in hepatocellular carcinoma (HCC)

Dysregulation of miRNAs has been proved to play a key role in carcinogenesis or tumor progression. In hepatocellular carcinoma (HCC), a number of miRNAs was reported to be related to the occurrence and development of HCC. Especially, miRNA-122, a liver-specific miRNA, has been elaborated its role in HCC. However, these studies was not involved in the effect of miRNA-184 on HCC. In the present study, we aimed to detect the miRNA-184 expression in HCC tissues and further evaluate the in vitro effect of miR-184 inhibition in HCC cells HepG2. We found that miR-184 expression was significantly high in HCC tissues, but INPPL1 expression was obviously low. Subsequently, INPPL1 was identified as a target of miRNA-184 by bioinformatics and dual luciferase assay. Moreover, after transfected with anti-miR-184 in HepG2 cells, INPPL1 expression was significantly decreased both at mRNA and protein levels. Additionally, we also proved that miR-184 silencing inhibited cellular proliferation by over expressing INPPL1 and induced HepG2 apoptosis by caspase 3/7. Together, our result was shown that miR-184 might play a part in proliferation of HCC cells by INPPL1 loss and act as antiapoptotic factor in the development of HCC by inhibiting the activities of caspases 3/7. Therefore, further elucidation of miRNA-184 silencing is helpful for understanding the pathogenesis of HCC and devising new strategies for its prevention and therapy.     

外周血miR-27a、miR-29b联合PSA检测在诊断前列腺癌中的应用

目的探讨外周血miR-27a、miR-29b联合前列腺特异抗原(PSA)检测在诊断前列腺癌(Prostate cancer,PC)中的应用价值。方法收集2016年12月至2018年12月在本院确诊的94例初诊PC患者的血清标本,以同期47例前列腺增生(Benign Prostatic Hyperplasia,BPH)患者的血清标本为BPH组,同期47例健康体检者的血清标本为对照组。采用RT-PCR检测各组血清样本中miR-27a和miR-29b的表达量;采用电化学发光仪检测血清总PSA(tPSA)、游离PSA(fPSA)以及fPSA与tPSA的比值(f/tPSA);采用ROC分析miR-27a、miR-29b联合PSA诊断PC的价值,曲线下面积(AUC)表示诊断价值。结果与对照组相比,BPH和PC患者外周血中miR-27a mRNA的表达量和tPSA、fPSA水平显著升高(P<0.05),miR-29b mRNA的表达量和f/tPSA水平显著下降(P<0.05);与BPH组相比,PC患者外周血中miR-27a mRNA的表达量和tPSA、fPSA水平显著升高(P<0.05),miR-29b mRNA的表达量和f/tPSA水平显著下降(P<0.05);ROC分析显示,miR-27a、miR-29b、tPSA、f/tPSA、tPSA联合f/tPSA以及三者联合诊断PC的AUC依次为(0.816±0.032)、(0.792±0.032)、(0.837±0.027)、(0.833±0.027)、(0.882±0.022)、(0.958±0.013),且三者联合诊断的AUC显著高于单独诊断的AUC(P<0.05)。结论外周血miR-27a、miR-29b联合PSA检测可以显著提高PC患者的诊断价值。     

Interleukin-33 gene polymorphisms and chronic obstructive pulmonary disease in the Chinese Han population

ObjectiveTo investigate the relationship between interleukin (IL)-33 gene polymorphisms rs928413 and rs7044343 with chronic obstructive pulmonary disease (COPD) in the Chinese Han population.MethodWe assessed IL-33 rs928413 and rs7044343 polymorphisms by Sanger sequencing of PCR products amplified from the genomic DNA of 160 COPD patients and 123 healthy controls.ResultsThere was no significant difference in the distribution of rs928413 AA, AG, or AA genotypes or rs7044343 CC, CT, or TT genotypes between the two groups. However, COPD patients had a significantly higher frequency of the rs928413 G allele G (14.1% vs 7.3%, respectively). This allele was significantly associated with susceptibility to COPD (odds ratio [OR]: 2.04, 95% confidence interval [CI]: 1.12–3.57). The rs928413 dominant inheritance model was associated with COPD susceptibility (OR: 2.08, 95%CI: 1.09–4.04).ConclusionThe G allele of rs928413 and the rs928413 dominant inheritance model were associated with susceptibility to COPD in the Chinese Han population.     

血清白细胞介素-33表达水平与原发性骨肉瘤患儿肺转移的相关性研究

目的 探讨原发性骨肉瘤患儿血清白细胞介素-33(IL-33)表达水平及其与肺转移的相关性.方法 选取126例骨肉瘤患儿为研究对象,根据患儿是否发生肺转移分为骨肉瘤肺转移组39例和骨肉瘤组87例,并选取40例健康体检儿童为对照组.记录骨肉瘤患儿肺转移的发生率并比较3组血清IL-33水平差异.分析骨肉瘤患儿发生肺转移的危险...     

Incarceration of the meniscus in fractures of the intercondylar eminence of the tibia in children

Four cases of trapping of the meniscus in type II or III fractures of the intercondylar eminence of the tibia in children are reported. At operation the fragments could not be apposed until the meniscus had been lifted out of the fracture. In our opinion, if they had not been operated on these patients would have had persistent trouble in the knee, including non-union, loss of extension and laxity of the anterior cruciate ligament. We therefore recommend either operation for type II and type III lesions or arthroscopy. If the meniscus is trapped we suggest that it should be lifted out and the fragments apposed under arthroscopic control.     

脑胶质瘤中P33ING1的表达及临床意义

目的 检测脑胶质瘤中P33ING1的基因和蛋白表达,探讨其在胶质瘤发生、发展中的作用及临床意义.方法 选取行脑胶质瘤手术切除的新鲜胶质瘤标本50例,分别应用RT-PCR方法和S-P免疫组织化学方法检测P33ING1在瘤组织及正常脑组织中的表达.实验数据用SPSS11.5软件包进行统计.结果 50例胶质瘤中P33ING1 mRNA和蛋白的阳性表达率均为90%(45/50),正常脑组织中全部表达阳性(100%).P33ING1蛋白表达的LI值与P33ING1mRNA表达的RI值呈显著正相关(r=0.8841,P＜0.01).随着肿瘤级别的升高基因与蛋白水平的表达均随之减少(P＜0.01).结论 抑癌基因P33ING1异常表达与其恶性程度密切相关.检测其表达水平的变化对胶质瘤的早期诊断、基因介导治疗及判断预后方面均有重要指导意义.