非小细胞肺癌患者血清miR-146a、miR-141的表达及临床意义

目的:研究非小细胞肺癌(NSCLC)患者血清微小RNA-146a(mi R-146a)、mi R-141的表达及临床意义。方法:选取2015年1月至2018年1月我院收治的106例NSCLC患者记为NSCLC组,另选取同期于我院进行体检的40例健康体检者记为健康对照组。采用荧光实时定量PCR(qRT-PCR)检测两组血清mi R-146a、mi R-141的表达水平,分析NSCLC患者血清mi R-146a、mi R-141表达水平与临床病理参数的关系,比较血清mi R-146a、mi R-141单一诊断及联合诊断NSCLC的曲线下面积(AUC)、灵敏度、特异度。结果:NSCLC组患者的血清mi R-146a、mi R-141表达水平高于健康对照组(P0.05)。NSCLC患者血清mi R-146a表达水平与病理分期有关(P0.05),与年龄、性别、吸烟史、病理类型、病理分级、肿瘤直径及是否伴有淋巴结转移无关(P0.05)。NSCLC患者血清mi R-141表达水平与病理分期、病理分级及是否伴有淋巴结转移有关(P0.05),与年龄、性别、吸烟史、病理类型、肿瘤直径无关(P0.05)。血清mi R-146a、mi R-141单一诊断及两者联合诊断NSCLC的AUC分别为0.841、0.772、0.921,敏感度分别为85.1%、80.5%、93.5%,特异度分别为84.2%、75.3%、89.8%。结论:NSCLC患者血清mi R-146a、mi R-141表达水平升高,且与部分临床病理参数有关,两者联合检测对NSCLC诊断具有较高的诊断价值。     

血清LncRNA XIST与miR-33a在膀胱癌中的表达及临床意义

目的:探究血清长链非编码RNA X染色体失活特异转录本(Lnc RNA XIST)与微小RNA-33a(mi R-33a)在膀胱癌中的表达及临床意义。方法:选择2017年4月至2019年8月青岛大学附属医院诊治的95例膀胱癌患者作为膀胱癌组,选择同期体检的95例健康者作为健康组。采用荧光定量PCR检测两组的血清LncRNA XIST与mi R-33a表达水平,分析患者的临床病理参数与血清LncRNA XIST、mi R-33a表达水平的关系,采用受试者工作特征曲线(ROC)分析血清LncRNA XIST与mi R-33a对膀胱癌的预测价值。结果:与健康组相比,膀胱癌组的血清LncRNA XIST表达水平明显升高(P0.05),而血清mi R-33a表达水平明显下降(P0.05)。血清LncRNA XIST与mi R-33a表达均与膀胱癌患者的TNM分期和淋巴结转移情况相关(P0.05)。血清LncRNA XIST联合mi R-33a(AUC=0.830,敏感性=90.47%,特异性=89.85%)预测膀胱癌的临床价值明显高于血清LncRNA XIST(AUC=0.716,敏感性=81.36%,特异性=80.74%)及血清mi R-33a(AUC=0.736,敏感性=82.19%,特异性=81.09%)单独检测。结论:血清LncRNA XIST表达异常升高、血清mi R-33a表达降低与膀胱癌发生密切相关,联合检测有助于预测膀胱癌发生的风险,从而为临床制定针对性干预和治疗方案提供参考。     

miR-181a通过调控上皮间质转化过程影响卵巢癌细胞的迁移和侵袭

目的:探讨mi R-181a在卵巢癌细胞中的表达及对卵巢癌细胞的迁移和侵袭的影响和可能机制。方法:采用细胞免疫荧光检测卵巢癌细胞中抗波形蛋白和E-钙粘蛋白的表达,Western blotting检测mi R-181a对抗波形蛋白和E-钙粘蛋白的表达情况的调控;划痕愈合实验检测mi R-181a对卵巢癌细胞迁移能力的影响;Transwell侵袭实验检测mi R-181a对卵巢癌细胞侵袭能力的影响。结果:增加mi R-181a的表达后,EMT过程中的相关蛋白激活水平下调,mi R-181a一定程度上可以抑制卵巢癌细胞的EMT过程;过表达mi R-181a后可以明显影响Vimentin[D1(4.58±0.85)vs(0.29±0.02),P0.05;D5(4.16±0.79)vs(0.29±0.02),P0.05]和E-Cadherin[D1(4.75±0.41) vs.(4.56±0.38),P0.05;D5(2.19±0.18) vs.(4.56±0.38),P0.05]蛋白的表达;COC1细胞的迁移能力随mi R-181a的表达的增高而降低[(19.24±4.31)%vs.(25.95±6.02)%,P0.05;(51.25±8.75)%vs.(73.49±12.54)%,P0.05];过表达mi R-181a后可以一定程度上减弱卵巢癌COC1细胞的侵袭能力[(74.64±8.21)vs(231.98±21.72),P0.05]。结论:mi R-181a通过调控上皮间质转化过程影响卵巢癌细胞的迁移和侵袭行为。     

miRNA-200 家族在卵巢癌中作用的研究进展

MicroRNA(miRNA)是一类非编码小分子RNA,参与基因转录后水平调控,与肿瘤的形成、侵袭及转移、治疗及预后过程密切相关。研究发现,miRNA-200家族包括miR-141、miR-200a、miR-200b、miR-200c和miR-429在卵巢癌中的表达改变明显,且参与卵巢癌的发生、侵袭转移、卵巢癌细胞对紫杉醇的敏感性及复发过程,可能是用于卵巢癌的早期诊断、治疗、预后预测的指标。本文主要对miRNA-200家族在卵巢癌中的研究进展进行综述。     

抑郁症患者血清miR-135a、miR-221表达水平与认知功能、事件相关电位P300和炎症细胞因子的相关性分析

目的:探讨抑郁症患者血清微小核糖核酸(mi R)-135a、mi R-221表达水平与认知功能、事件相关电位P300和炎症细胞因子的相关性。方法:选择2019年1月至2021年1月我院收治的216例抑郁症患者(抑郁症组)和同期于我院体检的200例健康志愿者(对照组)。检测血清mi R-135a、mi R-221表达水平及白细胞介素-6(IL-6)、超敏C反应蛋白(hs-CRP)、肿瘤坏死因子-α(TNF-α)水平。采用蒙特利尔认知评估量表(MoCA)、简易精神状态检查量表(MMSE)评估认知功能。采用全功能肌电诱发电位仪检测P3潜伏期和P3波幅。Pearson相关性分析mi R-135a、mi R-221表达水平与MoCA评分、MMSE评分、IL-6,hs-CRP,TNF-α、P3潜伏期和P3波幅的相关性。结果:抑郁症组血清mi R-221表达水平、P3潜伏期,血清IL-6、hs-CRP、TNF-α水平高于对照组(P<0.05),mi R-135a表达水平、MMSE评分、MoCA评分、P3波幅低于对照组(P<0.05)。mi R-221表达水平与P3潜伏期,血清IL-6、hs-CRP、TNF-α水平呈正相关(P<0.05),与MMSE评分、MoCA评分、P3波幅呈负相关(P<0.05);mi R-135a表达水平与P3潜伏期,血清IL-6、hs-CRP、TNF-α水平呈负相关(P<0.05),与MMSE评分、MoCA评分、P3波幅呈正相关(P<0.05)。结论:抑郁症患者血清mi R-135a表达水平降低,mi R-221表达水平增高,mi R-135a低表达和mi R-221高表达与抑郁症患者认知功能降低、机体炎症反应有关。     

氧化应激诱导内皮细胞凋亡microRNA表达改变的研究

目的:研究氧化应激诱导的内皮细胞micro RNA的表达变化。方法:ECM(Endothelial Cell Medium)培养人脐静脉内皮细胞,利用不同浓度双氧水(0μmol/L,200μmol/L,500μmol/L,800μmol/L)刺激24小时后应用流式细胞术检测其凋亡水平。提取细胞总RNA,利用实时定量PCR(Quantitive real-time PCR;q RT-PCR)检测micro RNA表达量变化,并利用生物信息学软件预测可能的靶基因。结果:加入不同浓度双氧水处理24 h后的内皮细胞总凋亡率均显著高于对照组,200μmol/L、500μmol/L和800μmol/L组的凋亡率分别为(13.31%vs 4.75%,35.9%vs 4.75%,89.75%vs 4.75%,P0.01)。200μmol/L的双氧水处理内皮细胞后,micro RNA的表达出现了明显的改变。其中mi R-92a、mi R-126的表达明显下调(P0.05),mi R-181a、mi R-217、mi R-34a和mi R-320的表达明显上调(P0.05)。靶基因预测显示mi R-320、mi R-92a可能调控多个和内皮细胞凋亡相关的基因表达。结论:在氧化应激诱导的内皮细胞凋亡中,mi RNA表达发生改变并可能参与调控内皮细胞功能。     

血清miR-191作为卵巢癌患者诊断标志物的研究

目的探讨卵巢癌患者血清mi R-191含量,分析其与卵巢癌临床病理特征的关系。方法收集本院收治的上皮性卵巢癌患者血清样本50例,采用实时定量PCR方法检测血清中mi R-191的水平。同时收集卵巢癌患者的临床病理资料,分析mi R-191的含量与患者临床病理特征的关系。应用受试者工作曲线(ROC)分析mi R-191在卵巢癌诊断中的临床价值。选取同时期50例健康体检者作为对照。结果上皮性卵巢癌患者血清mi R-191的含量显著高于健康对照组,差异具有统计学意义(P0.05)。手术-病理分期期别晚、有淋巴结转移者血清mi R-191含量显著高于手术-病理分期期别早和无淋巴结转移者(P0.05)。血清mi R-191诊断卵巢癌的ROC曲线下面积(AUC)、灵敏度、特异度分别为0.85、84.7%、83%,95%可信区间(CI)为0.771~0.928。结论卵巢患者血清mi R-191水平升高,与患者临床病理特征有关。mi R-191在卵巢癌诊断中具有一定的价值,可应用于卵巢癌的辅助检查。     

胃癌组织miR-203、miR-4317的表达及临床意义

目的:探讨胃癌组织中微小核糖核酸(mi R)-203、mi R-4317的表达情况及其临床意义。方法:选择2014年1月至2016年12月我院收治的胃癌患者92例,应用实时定量荧光PCR(qRT-PCR)检测患者胃癌组织及其相应癌旁组织中mi R-203、mi R-4317的表达情况,分析mi R-203、mi R-4317表达与胃癌患者临床病理参数的关系,所有患者随访3年,根据mi R-203、mi R-4317在胃癌组织中的中位表达量将患者分为mi R-203高表达组(49例)、mi R-203低表达组(43例)、mi R-4317高表达组(51例)、mi R-4317低表达组(41例)。分析mi R-203、mi R-4317与预后的关系及预后的影响因素。结果:胃癌组织中mi R-203、mi R-4317相对表达量显著低于癌旁组织(P<0.05)。不同性别、年龄、肿瘤大小胃癌患者胃癌组织中mi R-203、mi R-4317相对表达量比较无统计学差异(P>0.05),中低分化、TNM分期为III~IV期、有淋巴结转移胃癌患者胃癌组织中mi R-203、mi R-4317相对表达量显著低于高分化、TNM分期为I~II期、无淋巴结转移胃癌患者(P<0.05)。mi R-203高表达组3年生存率显著高于mi R-203低表达组(P<0.05),mi R-4317高表达组3年生存率显著高于mi R-4317低表达组(P<0.05)。COX多因素分析显示,中低分化、TNM分期为III~IV期、有淋巴结转移、mi R-203低表达、mi R-4317低表达是影响胃癌患者预后的独立危险因素(P<0.05)。结论:胃癌组织中mi R-203、mi R-4317异常低表达,其水平与胃癌预后密切相关,且胃癌患者预后与分化程度、临床分期、淋巴结转移等相关。     

非小细胞肺癌组织中miR-19b与miR-20a的表达及临床意义

目的:检测mi R-19b与mi R-20a在非小细胞肺癌(NSCLC)组织中的表达,探讨两者与肺癌临床病理的关系。方法:选择我院NSCLC肺癌患者50例,使用Real-time RT-PCR法对其癌组织及癌旁正常组织中mi R-19b和mi R-20a的含量进行检测,并利用2(-△△CT)法处理结果,分析与临床病理资料的关系。结果:相对于内参U6,mi R-19b基因在NSCLC组织中的表达量明显低于癌旁正常组织,而mi R-20a基因在NSCLC组织中的表达量明显高于癌旁正常组织,差异具有统计学意义(P0.05);在NSCLC组织标本中,mi R-19b基因表达量在临床分期I-II的标本中明显高于临床分期III,而mi R-20a基因表达量在临床分期I-II的标本中明显低于临床分期III,差异均就有统计学意义(P0.05);mi R-19b基因表达量在肿瘤病理低分化组织中明显低于肿瘤病理高分化组织,而mi R-20a基因表达量在肿瘤病理低分化组织中明显高于肿瘤病理高分化组织,差异均具有统计学意义(均P0.05)。结论:mi R-19b低表达和mi R-20a高表达与NSCLC的临床分期、病理分级具有密切关系,早期检测有助于NSCLC诊断和治疗。     

骨碎补对骨性关节炎患者骨关节滑膜组织中miR-27a、miR-146a表达的影响

目的:探讨骨碎补对骨性关节炎患者骨关节滑膜组织中mi R-27a、mi R-146a表达的影响。方法:选取我院收治的骨性关节炎患者46例,随机分为两组,每组各23例。对照组予抗骨增生治疗,实验组在对照组基础上加以骨碎补治疗。观察和比较两组患者的临床疗效、炎性因子水平的变化以及骨关节滑膜组织中mi R-27a、mi R-146a的表达情况。结果:1治疗后,两组患者的临床症状均有所改善,且实验组疗效高于对照组,差异有统计学意义(P0.05)。2治疗后,两组患者的IL-1β、PGE2水平均较治疗前显著降低,且实验组降低较对照组更明显,差异均有统计学意义(P0.05)。3治疗后,两组患者的骨关节滑膜组织中的mi R-27a、mi R-146a表达均降低,且与对照组比较,实验组较低,差异有统计学意义(P0.05)。结论:骨碎补能够降低骨性关节炎患者骨关节滑膜组织中mi R-27a、mi R-146a的表达,降低IL-1β、PGE2的水平,提高临床疗效。     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.     

Comparative morphology of the carpel in the Liliaceae: Hewardieae, Petrosavieae, and Tricyrteae

The young pistils in the melanthioid tribes, Hewardieae, Petrosavieae and Tricyrteae, are uniformly tricarpellate and syncarpous. They lack raphide idioblasts. All are multiovulate, with bitegmic ovules. The Petrosavieae are marked by the presence of septal glands and incomplete syncarpy. Tepals and stamens adhere to the ovary in the Hewardieae and the Petrosavieae but not in the Tricyrteae. Two vascular bundles occur in the stamens of the Hewartlieae and Tricyrtis latifolia. Ventral bundles in the upper part of the ovary of the Hewardieae are continuous with compound septal bundles and placental bundles in the lower part. Putative ventral bundles occur in the alternate position in the Tricyrteae and putative placental bundles in the opposite. position in the Petrosavieae. The dichtomously branched stigma in each carpel of the Tricyrteae is supplied by a bifurcated dorsal bundle.     

Enterovirus 71 3C proteolytically processes the histone H3 N-terminal tail during infection

Highlights
1. The N-terminal tail of histone H3 is specifically cleaved during EV71 infection.
2. Viral protease 3C is identified as a protease responsible for proteolytically processing the N-terminal H3 tail.
3. Our finding reveals a new epigenetic regulatory mechanism for Enterovirus 71 in virus-host interactions.     

Detection of EBV and HHV6 in the Brain Tissue of Patients with Rasmussen’s Encephalitis

Rasmussen’s encephalitis (RE) is a rare pediatric neurological disorder, and the exact etiology is not clear. Viral infection may be involved in the pathogenesis of RE, but conflicting results have reported. In this study, we evaluated the expression of both Epstein-Barr virus (EBV) and human herpes virus (HHV) 6 antigens in brain sections from 30 patients with RE and 16 control individuals by immunohistochemistry. In the RE group, EBV and HHV6 antigens were detected in 56.7% (17/30) and 50% (15/30) of individuals, respectively. In contrast, no detectable EBV and HHV6 antigen expression was found in brain tissues of the control group. The co-expression of EBV and HHV6 was detected in 20.0% (6/30) of individuals. In particular, a 4-year-old boy had a typical clinical course, including a medical history of viral encephalitis, intractable epilepsy, and hemispheric atrophy. The co-expression of EBV and HHV6 was detected in neurons and astrocytes in the brain tissue, accompanied by a high frequency of CD8⁺ T cells. Our results suggest that EBV and HHV6 infection and the activation of CD8⁺ T cells are involved in the pathogenesis of RE.     

Perinatal Vertical Transmission of Chikungunya Virus in Ruili,a Town on the Border between China and Myanmar

正Dear Editor,Chikungunya virus (CHIKV), an arbovirus in the family of Togaviridae, genus Alphavirus, is transmitted by the A.aegyptii or A. albopictus mosquito, and causes disease in humans characterized by fever, rash, and arthralgia (Silva and Dermody 2017; Suhrbier 2019). It was first reported in 1953 in Tanzania, and caused only a few outbreaks and sporadic cases in Africa and Asia in last century. However, in the epidemic in 2004, CHIKV acquired mutations that conferred enhanced transmission by the A. albopictus mosquito(Schuffenecker et al. 2006). Since then, it has successively caused outbreaks in Africa, the Indian Ocean, South East Asia, the South America, and Europe (Zeller et al. 2016).     

Development of a Novel Reverse Transcription Loop-Mediated Isothermal Amplification Method for Rapid Detection of SARS-CoV-2

In conclusion, the novel visual RT-LAMP assay is a simple, rapid, and sensitive approach for detection of SARS-CoV-2, and it is ready for application in primary care and community hospitals or health care centers, and even patients' own houses in response to the current SARS-CoV-2 epidemic because the assay does not require sophisticated equipment and skilled personnel. Furthermore, it is also ready to be used in fields for screening samples from wild animals and environments to facilitate the identification of potential intermediate hosts that mediate the cross-species transmission of SARS-CoV-2 from bats to humans.