MiR-30a-3p对人滋养肿瘤细胞系JEG-3细胞侵袭功能的影响

目的：MiRNAs对于胎盘的形成和正常妊娠的维持起着至关重要的作用,它在胎盘中的表达失衡的可能导致了妊娠相关疾病的发生,我们前期研究发现miR-30a-3p在子痫前期患者胎盘上特异性高表达,推测miR-30a-3p可能参与了子痫前期的发生发展过程,本课题通过观察miR-30a-3p对人滋养肿瘤细胞系JEG-3细胞侵袭能力的影响,深入探讨miR-30a-3p在子痫前期发病过程中的作用。方法：应用瞬时转染技术在人滋养肿瘤细胞系JEG-3细胞中分别转染miR-30a-3p mimics、mimics NC为miR-30a-3p过表达组和阴性对照组,空白转染组为空白对照组,利用荧光实时定量PCR技术检测各组细胞中miR-30a-3p的表达,Transwell实验检测各组细胞侵袭能力的差别。结果：荧光实时定量PCR结果显示miR-30a-3p过表达组与阴性对照组、空白对照组相比miR-30a-3p的表达量明显升高,差异具有统计学意义（P〈0.05）;Transwell实验结果显示miR-30a-3p过表达组细胞的侵袭能力与阴性对照组、空白对照组相比均有降低,差异具有统计学意义（P〈0.05）。阴性对照组与空白对照组的侵袭能力差异无统计学意义（P〉0.05）。结论：miR-30a-3p可以显著下调JEG-3细胞的侵袭力,miR-30a-3p有可能通过降低滋养细胞的浸润能力,导致滋养细胞对子宫肌层和螺旋动脉的浸润不足,造成＂胎盘浅着床＂,从而在子痫前期的发病过程中发挥了重要的作用,miR-30a-3p有望成为诊治子痫前期疾病的靶点。     

MiR-30a-3p 对人滋养肿瘤细胞系JEG-3 细胞侵袭功能的影响

目的：MiRNAs 对于胎盘的形成和正常妊娠的维持起着至关重要的作用,它在胎盘中的表达失衡的可能导致了妊娠相关疾 病的发生,我们前期研究发现miR-30a-3p 在子痫前期患者胎盘上特异性高表达,推测miR-30a-3p 可能参与了子痫前期的发生发 展过程,本课题通过观察miR-30a-3p 对人滋养肿瘤细胞系JEG-3 细胞侵袭能力的影响,深入探讨miR-30a-3p 在子痫前期发病过 程中的作用。方法：应用瞬时转染技术在人滋养肿瘤细胞系JEG-3 细胞中分别转染miR-30a-3p mimics、mimics NC为miR-30a-3p 过表达组和阴性对照组,空白转染组为空白对照组,利用荧光实时定量PCR 技术检测各组细胞中miR-30a-3p的表达,Transwell 实验检测各组细胞侵袭能力的差别。结果：荧光实时定量PCR结果显示miR-30a-3p 过表达组与阴性对照组、空白对照组相比 miR-30a-3p 的表达量明显升高,差异具有统计学意义（P<0.05）;Transwell 实验结果显示miR-30a-3p过表达组细胞的侵袭能力与 阴性对照组、空白对照组相比均有降低,差异具有统计学意义(P<0.05)。阴性对照组与空白对照组的侵袭能力差异无统计学意义 (P>0.05)。结论：miR-30a-3p 可以显著下调JEG-3 细胞的侵袭力, miR-30a-3p 有可能通过降低滋养细胞的浸润能力,导致滋养细胞 对子宫肌层和螺旋动脉的浸润不足,造成“胎盘浅着床”,从而在子痫前期的发病过程中发挥了重要的作用,miR-30a-3p 有望成为 诊治子痫前期疾病的靶点。     

Mir-18b对滋养细胞HTR-8细胞功能的影响

目的:通过研究mir-18b对滋养细胞HTR-8增殖、凋亡和凋亡相关蛋白的影响,了解mir-18b对人滋养细胞功能的调控作用,进一步明确mir-18b在子痫前期发生发展过程中的作用.方法:实验组通过化学方法合成mir-18b inhibitor,用脂质体2000包裹mir-18b inhibitor转入HTR-8细胞中,空白转染组为空白对照组.用Realtime-RT-PCR检测mir-18bmRNA水平的表达.应用流式细胞术检测细胞凋亡和增殖周期的变化.Western Blot检测P53、Bcl-2凋亡蛋白的表达.结果:Realtime-RT-PCR结果显示转染mir-18b inhibitor后mir-18b表达量与空白对照组相比表达量明显降低;细胞周期检测两组之间无明显差异;与空白对照组相比mir-18b inhibitor组细胞凋亡率增加三倍;Western Blot检测结果显示:转染了mir-18b inhibitor后P53的表达量增加,Bcl-2表达量减少.结论:研究结果显示,转染mir-18b inhibitor后细胞的凋亡率升高,P53表达量增加,Bcl-2的表达量减少.说明mir-18binhibitor可能通过调控P53与Bcl-2的表达增强了HTR-8细胞的凋亡能力.为研究PE的发病机理提供新的依据和线索.     

miR-374b-5p靶向调控UHMK1对前列腺癌PC-3细胞的影响

[目的]探讨miR-374b-5p调控UHMK1表达对前列腺癌PC-3细胞增殖、迁移及凋亡的作用。[方法]萤光霉素报告检测miR-374b-5p对UHMK1的调控作用,将miR-NC、miR-374b-5p inhibitor和miR-374b-5p mimic转染到前列腺癌PC-3细胞。采用CCK-8法检测细胞存活率,改良的Matrigel Boyden室测定对细胞的侵袭性实施检测,划痕实验对细胞的具体迁移力实施检测,流式细胞术检测细胞凋亡率,RT-qPCR检测miR-374b-5p和UHMK1 mRNA表达,Western Bloting检测UHMK1蛋白表达。[结果]与对照组比较,miR-374b-5p inhibitor组细胞存活率、迁移率、侵袭数、miR-374b-5p表达水平、UHMK1 mRNA表达和蛋白表达水平显著降低,细胞凋亡率显著升高(P<0.05);miR-374b-5p mimic组细胞存活率、迁移率、侵袭数、miR-374b-5p表达水平、UHMK1 mRNA表达和蛋白表达水平显著降低,细胞凋亡率显著降低(P<0.05)。与miR-374b-5p ...     

下调lncRNA MCF2L-AS1靶向miR-33b-5p抑制胃癌细胞增殖、迁移、侵袭并促进凋亡

摘要 目的：探讨lncRNA MCF2L-AS1对胃癌细胞恶性生物学行为的影响及分子机制。方法：选取45例胃癌患者的癌组织及癌旁正常组织,或培养胃黏膜上皮细胞GES-1、胃癌细胞HGC-27,采用RT-qPCR检测MCF2L-AS1和miR-33b-5p的表达水平。采用双荧光素酶报告实验检测MCF2L-AS1和miR-33b-5p的靶向关系。将HGC-27细胞分为si-NC组、si-MCF2L-AS1组、mimic NC组、miR-33b-5p mimic组、si-MCF2L-AS1+inhibitor NC组、si-MCF2L-AS1+miR-33b-5p inhibitor组,分别转染si-NC、si-MCF2L-AS1、mimic NC、miR-33b-5p mimic或共转染si-MCF2L-AS1+inhibitor NC、si-MCF2L-AS1+miR-33b-5p inhibitor。采用MTT实验检测细胞增殖情况,流式细胞术检测细胞凋亡率,克隆形成实验检测细胞克隆形成数,Transwell实验检测迁移和侵袭细胞数。结果：与癌旁正常组织或GES-1细胞相比,胃癌组织或HGC-27细胞中MCF2L-AS1表达水平升高、miR-33b-5p表达水平降低,差异均有统计学意义（P<0.05）。MCF2L-AS1可靶向调控miR-33b-5p。下调MCF2L-AS1或过表达miR-33b-5p,miR-33b-5p表达水平升高,HGC-27细胞凋亡率升高,但细胞增殖、克隆形成数、迁移和侵袭数均减少,差异均有统计学意义（P<0.05）。抑制miR-33b-5p可减弱下调MCF2L-AS1对HGC-27细胞的生物学作用。结论：下调MCF2L-AS1通过上调miR-33b-5p抑制胃癌细胞增殖、迁移、侵袭并促进凋亡;MCF2L-AS1通过靶向调控miR-33b-5p表达进而参与胃癌细胞的恶性生物学行为。     

MiR-218对滋养层细胞迁移侵袭的影响及其机制研究

目的：研究miR-218是否通过下调SOX4影响滋养层细胞系HTR-8细胞的迁移和侵袭。方法：妊娠期高血压疾病（HDCP）患者46例,平均年龄（31 ±4.6）岁,收缩期血压≥ 140 mmHg和/或舒张期血压> 90 mmHg;以血压正常孕妇50例为对照,实时荧光定量PCR（RT-PCR）检测两组患者静脉血中miR-218的表达情况。转染miR-218mimic和miR-NC至离体培养的HTR-8细胞中,将细胞分为对照组（加入DMEM）、空质粒组（加入miR-NC）和过表达miR-218组（加入miR-218 mimic）3组,检测细胞的迁移侵袭情况以及细胞中MMP-2和MMP-9的表达,,生物信息学预测miR-218潜在靶基因为SOX4,利用荧光素酶素试验验证SOX4是miR-218的靶基因;再通过转染过表达SOX4的质粒至HTR-8细胞,HTR-8细胞分为过表达miR-218组、过表达miR-218+空质粒组、过表达miR-218+SOX4组,以上方法检测HTR-8细胞的迁移侵袭情况。结果：相比于正常孕妇组,HDCP组患者血清中miR-218表达减少（P <0.01）。相比于空质粒组,转染miR-218mimic后,HTR-8细胞中MMP-2、MMP-9、SOX4的表达减少（P < 0.01）,细胞迁移和侵袭能力下降（P < 0.01）;荧光素酶试验结果显示,miR-218能够显著降低SOX4-3'-UTR质粒的荧光素活性（P< 0.01）;相比于miR-218+空质粒组,转染过表达SOX4质粒后,HTR-8细胞迁移和侵袭能力增加（P < 0.01）。结论：HDCP患者血清中miR-218表达减少,miR-218可以通过下调SOX4从而抑制HTR-8细胞的迁移和侵袭。     

miR-106b-5p靶向调控SIRT7/SMAD4信号通路对口腔鳞状细胞癌侵袭和迁移的影响机制探究

该文探讨了miR-106b-5p对口腔鳞状细胞癌(OSCC)细胞迁移和侵袭的影响及其机制。采用qRT-PCR检测OSCC组织与细胞系中mi R-106b-5p表达情况,将SCC15、OECM1细胞分为Control组、miR-NC组、miR-106b-5p mimics组、anti-miR-NC组、anti-miR-106b-5p、anti-miR-106b-5p+si-NC组、anti-miR-106b-5p+si-SIRT7组,分别检测各组细胞增殖、迁移及侵袭能力, Western blot检测E-cadherin、N-cadherin、MMP-9、SIRT7、SMAD4蛋白表达情况,双荧光素酶报告基因实验与RIP实验验证miR-106b-5p与SIRT7的靶向关系。结果显示, miR-106b-5p在OSCC组织与细胞中表达水平升高(P<0.05),过表达mi R-106b-5p可显著促进OSCC细胞增殖、迁移、侵袭及EMT,抑制miR-106b-5p表达可显著抑制OSCC细胞增殖、迁移、侵袭及EMT(P<0.05);双荧光素酶报告基因实验与RIP实验证实, miR-...     

抑制miR-130b-3p通过上调PTEN和灭活PI3K-AKT及整合素β1/FAK信号通路抑制膀胱癌细胞增殖

miR-130家族在癌的进展中发挥作用;然而,其家族成员在膀胱癌中的作用尚罕见报告。本研究证明,抑制miR-130家族成员miR-130b-3p表达促进PTEN表达,诱导细胞凋亡,抑制膀胱癌细胞增殖。首先,我们采用微阵列对来自膀胱癌患者的4对膀胱癌和癌旁组织进行了miRNA和mRNA组学分析,发现miR-130b-3p和miR-106b-3p在膀胱癌组织高表达,而miR-99a-3p、miR-199a-5p和miR-145-3p低表达。RT-q PCR检测30对膀胱癌组织5种miRNA的表达与微阵列中的表达状况一致。此外,我们在mRNA组学分析中还发现,miR-130b-3p在膀胱癌组织的高表达与PTEN表达呈负相关。为此,在后续研究中集中探索了miR-130b-3p在膀胱癌中的作用及其作用机制。生物信息学及荧光素酶报告结果证明,miR-130b-3p可直接结合PTEN的3'-UTR,靶向抑制PTEN的表达。转染结合CCK-8、EDU、流式分析、划痕及Transwell小室实验显示,转染miR-130b-3p模拟物可明显促进膀胱癌T24细胞的增殖、迁移及侵袭能力;相反,转染miR-130b-3p抑制物可明显诱导T24细胞凋亡。鬼笔环肽染色揭示,转染miR-130b-3p模拟物可促进细胞骨架形成,而转染miR-130b-3p抑制物抑制细胞骨架形成。Western印迹证明,转染miR-130b-3p可下调PTEN在T24细胞的表达,上调p-PI3K、p-AKT、p-FAK和整合素β1的表达;而转染miR-130b-3p抑制物上调PTEN的表达,下调p-PI3K、p-AKT、p-FAK和整合素β1的表达。上述结果提示,miR-130b-3p通过抑制PTEN表达,激活PI3K-AKT及整合素β1/FAK信号通路,在膀胱癌中发挥癌基因样作用;相反,抑制miR-130b-3p可上调PTEN表达,抑制PI3K-AKT及整合素β1/FAK信号通路的激活,诱导凋亡,抑制膀胱癌细胞的增殖、迁移和侵袭能力。我们的结果还提示,miR-130b-3p作为可能的临床标志物,对膀胱癌的诊断、靶向治疗具有潜在的应用价值。     

lncRNA BLACAT1通过抑制miR-374b-5p促进非小细胞肺癌细胞增殖和转移

目的:研究长链非编码RNA BLACAT1在非小细胞肺癌发生和转移过程中的作用机制。方法:starBase软件分析TCGA数据库中肺腺癌及肺鳞癌与癌旁组织之间BLACAT1表达差异;qRT-PCR检测人非小细胞肺癌细胞A549、HCC827、NCI-H1299、NCI-H23和正常肺上皮细胞BEAS-2B中BLACAT1的转录水平差异,筛选BLACAT1高表达非小细胞肺癌细胞系;CCK-8检测BLACAT1对非小细胞肺癌细胞增殖能力的影响;Transwell检测BLACAT1对非小细胞肺癌细胞迁移和侵袭能力的影响;starBase软件预测BLACAT1作用的miRNA,采用qRT-PCR验证敲低BLACAT1对预测miRNA表达的影响,筛选与BLACAT1相互作用的miRNA,双萤光素酶报告基因实验验证结果;CCK-8检测BLACAT1/miR-374b-5p对非小细胞肺癌细胞增殖能力的影响;Transwell检测BLACAT1/miR-374b-5p对非小细胞肺癌细胞迁移和侵袭能力的影响;Western印迹检测非小细胞肺癌细胞转移相关基因的蛋白表达水平。结果:肺腺癌及肺鳞癌组织中BLACAT1表达量显著高于癌旁组织;非小细胞肺癌细胞A549的BLACAT1表达量最高;敲低BLACAT1降低A549细胞活力、迁移和侵袭能力;BLACAT1作为海绵吸附miR-374b-5p;敲低BLACAT1增加miR-374b-5p的表达,抑制非小细胞肺癌细胞增殖、迁移和侵袭。结论:BLACAT1通过抑制miR-374b-5p促进非小细胞肺癌细胞增殖和转移。     

miR-335对骨肉瘤细胞增殖和迁移的影响

目的:通过研究miR-335对骨肉瘤细胞系SOSP-9607增殖和迁移的影响,探讨miR-335在骨肉瘤细胞生物学行为中的作用。方法:体外培养SOSP-9607细胞并将其分三组,分别为实验组、阴性对照组和空白对照组。实验组转染miR-335模拟物(has-miR-335 mimics),阴性对照组转染阴性对照序列(negative control,NC),空白对照组细胞不行任何转染。采用噻唑蓝(MTT)比色实验法检测和比较细胞处理24、48、72和96 h的增殖情况,采用Transwell实验检测和比较各组细胞的迁移情况。结果:MTT结果显示,实验组细胞48、72和96 h增殖率较阴性对照组明显降低(P0.01),而阴性对照组及空白对照组细胞增殖率比较未见明显差异(P0.05)。在Transwell迁移和侵袭实验中,与阴性对照组比较,实验组细胞的侵袭及迁移能力也明显降低(P0.05),而两对照组细胞迁移及侵袭能力也无明显差异(P0.05)。结论:miR-335可显著抑制骨肉瘤细胞的增殖及迁移,有望成为骨肉瘤治疗的新靶点,值得深入研究。     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

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.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.