CDK11P58和Cyclin D3在损伤后大鼠坐骨神经中的表达变化

为了探讨大鼠坐骨神经损伤对CDK11P58和Cyclin D3表达的影响,本实验将成年SD大鼠随机分为假手术组和夹伤组,运用Western blot结合免疫荧光组织化学双标技术,观察了坐骨神经损伤后坐骨神经夹伤段、脊髓腰膨大前角和伤侧腓肠肌内CDK11P58和Cyclin D3的表达变化.结果显示:(1)坐骨神经夹伤后,坐骨神经夹伤段及脊髓腰膨大前角、伤侧腓肠肌中的CDK11P58蛋白的表达先逐渐下降,后又逐渐上升;而Cyclin D3的表达无明显变化;(2)在假手术组的坐骨神经、脊髓腰膨大前角和腓肠肌内都可观察到CDK11P58和Cyclin D3的表达;而坐骨神经夹伤后,在上述部位可检测到CDK11P58的表达强度明显减弱,但Cyclin D3无明显变化;(3)免疫荧光双标结果显示CDK11P58和Cyclin D3在假手术组的坐骨神经、脊髓腰膨大前角和伤侧腓肠肌内都有共存;而在坐骨神经损伤后这种共存强度明显降低.以上结果提示,坐骨神经损伤可影响坐骨神经及脊髓腰膨大、伤侧腓肠肌内CDK11P58的表达,但对Cyclin D3无明显影响,表明CDK11P58可能在周围神经损伤和修复中发挥重要作用.     

CDK11p58 kinase activity is required to protect sister chromatid cohesion at centromeres in mitosis

The cyclin-dependent kinase CDK11^p58 is specifically expressed at G2/M phase. CDK11^p58 depletion leads to different cell cycle defects such as mitotic arrest, failure in centriole duplication and centrosome maturation, and premature sister chromatid separation. We report that upon CDK11 depletion, loss of sister chromatid cohesion occurs during mitosis but not during G2 phase. CDK11^p58 depletion prevents Bub1 and Shugoshin 1 recruitment but has no effect on the dimethylation of histone H3 lysine 4 at centromeres. We also report that a construct expressing a kinase dead version of CDK11^p58 fails to prevent CDK11 depletion-induced sister chromatid separation, showing that CDK11^p58 kinase activity is required for protection of sister chromatid cohesion at centromeres during mitosis. Thus, CDK11^p58 kinase activity appears to be involved in early events in the establishment of the centromere protection machinery.     

Lipopolysaccharide Affects the Proliferation and Glucose Metabolism of Cervical Cancer Cells Through the FRA1/MDM2/p53 Pathway

Previous studies have found that LPS and FRA1 play opposite roles in cervical cancer. In addition, LPS functions by regulating the expression of FRA1 in many disease models, but there is currently no study of their relationship in the energy metabolism of tumor cells. This study, therefore, investigates the effects of LPS on FRA1-mediated glucose metabolism and the possible mechanisms it may have in cervical cancer cells. We constructed FRA1 stable overexpressing/ empty vector cervical cancer cell lines, where glucose consumption, the level of lactic acid production and the expression of energy metabolism related molecules were detected under the stimulation of LPS. At the same time, the changes in proliferation ability of cervical cancer cells were detected. We discovered that LPS promotes glucose consumption, lactic acid production, pentose phosphate bypass, and inhibits aerobic oxidation, by inhibiting the expression of FRA1; and that LPS promotes the growth of cervical cancer cells. Our results indicate that LPS affects the proliferation and glucose metabolism of cervical cancer cells through the FRA1/MDM2/p53 pathway.     

Cyclin A/CDK2 regulates V(D)J recombination by coordinating RAG-2 accumulation and DNA repair

Accumulation of the V(D)J recombinase protein RAG-2 is restricted to G0/G1 cells by phosphorylation-mediated degradation at the G1-S boundary. Here cyclin A/CDK2 is shown to oppose RAG-2 accumulation; conversely, RAG-2 is induced by p27Kip1 and related CDK inhibitors. Coinduction of RAG-2 and G1 delay by p27Kip1 is accompanied by strong stimulation of V(D)J recombination. Unexpectedly, induction of RAG-2 accumulation in the absence of G1 delay has no effect on recombination frequency. p27Kip1 may stimulate V(D)J recombination by coordinating accumulation of RAG-2 with prolongation of G1, when nonhomologous end joining is preferentially active. Consistent with this, enforced expression of RAG-2 throughout cell cycle is associated with accumulation of aberrant recombination products reminiscent of those formed in the absence of nonhomologous end joining.     

Cyclin D3 expression in primary Ta/T1 bladder cancer

Cyclin D3 deregulation has recently been reported in bladder cancer but its prognostic significance remains uncertain. A cohort of 159 patients with stage Ta or T1 primary bladder tumours was investigated to determine the significance of cyclin D3 expression in association with other G1-S phase regulators of the cell cycle (p53, p21Waf1, p27kip1, cyclin D1), including tumour proliferation (ki67-MIB1); its association with conventional clinicopathological parameters; and the relationship between cyclin D3 and loss of heterozygosity (LOH) at the 9p21 (p16INK4a locus) chromosome region. The end point of the study was progression-free survival. Cyclin D3, other G1-S phase regulators, and tumour proliferation were investigated by immunohistochemistry and measured by the grid-counting method. To validate the immunohistochemical expression, cyclin D3 was additionally assessed by western blotting in selected cases. LOH at the 9p21 chromosome region (marker D9S171) was assessed in 125 cases using an AB Prism 310 genetic analyser and a set of microsatellite fluorescence-labelled primers. Cyclin D3 overexpression was related to larger tumour size (>5 cm; p < 0.0001) and high tumour proliferation (>10%; p = 0.025). Mean cyclin D3 expression increased with 2004 WHO grading categories in stage Ta (p = 0.035, ANOVA) and stage T1 (p = 0.047, t test) tumours. Cyclin D3 was not related to other clinicopathological parameters, G1-S phase modulators, or 9p21 LOH. Cox's multivariate analysis selected cyclin D3 as an independent predictor of progression-free survival (p = 0.0012, relative risk (RR) = 5.2366) together with tumour size (p = 0.0115, RR = 4.4442) and cyclin D1 (p = 0.0065, RR = 3.3023). Cyclin D3 expression had the highest risk ratio. Our results suggest that expression of cyclin D3 is relevant to the progression-free survival of patients with Ta/T1 bladder carcinomas.     

Modulation of Expression of Genes Involved in the Inflammatory Response by Lipopolysaccharide and Temperature in Cultured Human Astroglial Cells

In bacterial sepsis and meningitis, large concentrations of interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) correlate directly with morbidity and mortality. This laboratory has reported previously that elevated temperature in the physiologic range is associated with down regulation of IL-1β and TNFα expression in cultured astroglia after lipopolysaccharide (LPS) stimulation. To further investigate the role of elevated temperature in the CNS inflammatory response, the effects of LPS and elevated temperature on the expression of genes that participate in the inflammatory response were determined in cultured transformed human fetal astrocytes and in an astrocytoma cell line. The effect of physiologic temperature elevation on cytokine concentrations in cerebrospinal fluid (CSF) was also investigated in a rabbit meningitis model. The findings indicate that astrocytes express a wide variety of cytokines, growth factors, growth factor receptors, and other genes that could play important roles in CNS inflammation. Furthermore, temperature elevation in the febrile range can lead to alterations in the patterns of expression of many genes involved in the inflammatory response of these cells.     

miR-495-3p / WIF1 / Wnt 信号通路轴调节视网膜母细胞瘤细胞 增殖、 迁移和侵袭

目的 分析 miR-495-3p / Wnt 抑制因子 (Wnt inhibitor factor 1, WIF1) / Wnt 信号通路轴调节视网 膜母细胞瘤 (retinoblastoma, RB) 细胞增殖、 迁移和侵袭。 方法 生物信息学分析 WIF1 的差异表达及与 临床不良表型之间的关系, 并预测 miRNA 靶标; 双荧光酶素报告实验验证。 构建稳定过表达 WIF1 的 RB 细胞 (Vector 组、 WIF1 组)。 构建稳定过表达 miR-495-3p 的 RB 细胞 (miR-NC 组、 miR-495-3p 组和 miR495-3p + WIF1 组)。 Western 印迹检测 WIF1 蛋白及 Wnt 通路相关蛋白表达, 并进行体外功能试验。 裸鼠移 植瘤实验分析移植瘤体积重量。 免疫组化分析 WIF1 在 RB 组织中水平。 结果 WIF1 低表达, 与迁移、 侵袭 有关, 为 miR-495-3p 靶标, 双荧光酶素报告实验证实 WIF1 是 miR-495-3p 作用靶点。 WIF1 过表达抑制细胞增 殖、 迁移和侵袭, 影响细胞周期, 诱导凋亡。 体内实验显示 WIF1 在 RB 组织中过表达, 其过表达抑制瘤体生 长。 过表达 WIF1 下调 β-catenin、 c-Myc 蛋白水平 (P< 0. 05)。 过表达 miR-495-3p 下调 WIF1 蛋白水平, 上调 β-catenin 和 c-Myc 蛋白水平, 促进细胞增殖迁移、 迁移和侵袭, 抑制细胞凋亡 (P< 0. 05), 增加 WIF1 表达 可逆转 miR-495-3p 的作用 (P< 0. 05)。 结论 miR-495-3p 靶向 WIF1 通过 Wnt 信号通路抑制 RB 细胞增殖、 迁移和侵袭, 并诱导凋亡。     

circUBE2D2 靶向 miR-376a-3p 调控结直肠癌 SW620 细胞的增殖、迁移及侵袭

目的 探讨 circUBE2D2 对结直肠癌 SW620 细胞增殖、 迁移及侵袭的影响及其可能作用机制。 方法 收集 2020 年 1 月至 2020 年 5 月大连大学附属新华医院肛肠外科收治的 45 例结直肠癌患者的癌组织及 其相应癌旁组织标本, 采用 qRT-PCR 法检测 circUBE2D2、 miR-376a-3p 的表达量; 以人结直肠癌细胞 SW620 为研究对象, 随机分为 si-NC 组、 si-circUBE2D2 组、 miR-NC 组、 miR-376a-3p 组、 si-circUBE2D2 + anti-miR-NC 组和 si-circUBE2D2 + anti-miR-376a-3p 组; CCK-8 法、 平板克隆形成实验、 划痕实验与 Transwell 实验分别检测细胞增殖、 克隆形成、 迁移及侵袭; 双荧光素酶报告实验检测 miR-376a-3p 过表达对野 生型载体 WT-circUBE2D2 的荧光素酶活性; Western 印迹法检测上皮型钙黏蛋白 (E-cadherin)、 神经型钙 黏蛋白 (N-cadherin) 蛋白表达量。 结果 与癌旁组织比较, 结直肠癌组织中 circUBE2D2 的表达量升高 (P< 0. 05), miR-376a-3p 的表达量降低 (P< 0. 05); 与 si-NC 组比较, si-circUBE2D2 组细胞活力、 划痕愈 合率和 N-cadherin 蛋白水平降低 (P< 0. 05), 细胞克隆形成数和侵袭细胞数减少 (P< 0. 05), E-cadherin 蛋 白水平升高 (P< 0. 05); 与 miR-NC 组比较, miR-376a-3p 组细胞活力、 划痕愈合率和 N-cadherin 蛋白水平 降低 (P< 0. 05), 细胞克隆形成数和侵袭细胞数减少 (P< 0. 05), E-cadherin 蛋白水平升高 (P< 0. 05); miR-376a-3p 过表达可抑制野生型载体 WT-circUBE2D2 的荧光素酶活性 (P< 0. 05); 与 si-circUBE2D2 + anti-miR-NC 组比较, si-circUBE2D2 + anti-miR-376a-3p 组细胞活力、 划痕愈合率和 N-cadherin 蛋白水平升高 (P< 0. 05), 细胞克隆形成数和侵袭细胞数增多 (P< 0. 05), E-cadherin 蛋白水平降低 (P< 0. 05)。 结论 干扰 circUBE2D2 表达可通过靶向调控 miR-376a-3p 表达而降低结直肠癌细胞增殖、 克隆形成、 迁移及侵袭 能力。     

Cyclin D3 immunoreactivity in gastrointestinal stromal tumors is independent of cyclin D3 gene amplification and is associated with nuclear p27 accumulation.

An abnormal expression of cyclin D3, a key regulator of the cell cycle, has been documented in a variety of human malignancies, and the cyclin D3 gene, mapping to 6p21, may be deregulated in human tumors as a result of the t(6;14)(p21.1;q32.3) translocation or gene amplification. In the current study, we for the first time investigated by immunohistochemistry and fluorescence in situ hybridization (FISH) the prevalence of cyclin D3 abnormalities in gastrointestinal stromal tumors (GISTs), comparing the results with traditional pathological characteristics, p27 immunoreactivity (IR), and Ki-67 labeling index (LI). All the tumors showed nuclear cyclin D3 IR, with a percentage of immunostained neoplastic cells ranging from 10 to 95% (mean, 67.3 +/- 22.9%). In 4 (40%) of the 10 cases analyzed by FISH, cyclin D3 extrasignals were detected. Cohybridization with probes specific for the centromeric region and the long arm of chromosome 6 indicated trisomy in one case, whereas in the remaining three cases the pattern was highly suggestive for the occurrence of an isochromosome 6p. There was no association between the cyclin D3 gene copy number and IR for the encoded protein. Cyclin D3 IR was positively associated with p27 IR (P =.004) but not with Ki-67 LI or tumor malignant potential. On the contrary, p27 IR was inversely associated with Ki-67 LI (P =.004) and was more prevalent in tumors of low or intermediate malignant potential, though at a borderline level of statistical significance (P =.066) only. These data suggest that cyclin D3 expression in GISTs is independent of gene amplification and that this protein may be involved in the pathogenesis of GISTs by counteracting the inhibitory activities of p27.     

Lipopolysaccharide enhances FcγR-dependent functions in vivo through CD11b/CD18 up-regulation

Fc receptors for immunoglobulin G (IgG) (FcgammaR) mediate several defence mechanisms in the course of inflammatory and infectious diseases. In Gram-negative infections, cellular wall lipopolysaccharides (LPS) modulate different immune responses. We have recently demonstrated that murine LPS in vivo treatment significantly increases FcgammaR-dependent clearance of immune complexes (IC). In addition, we and others have reported the induction of adhesion molecules on macrophages and neutrophils by LPS in vivo and by tumour necrosis factor-alpha (TNF-alpha) in vitro. The aim of this paper was to investigate CD11b/CD18 participation in LPS enhancing effects on Fcgamma-dependent functionality of tissue macrophages. Our results have demonstrated that LPS can enhance antibody-dependent cellular cytotoxicity (ADCC) and IC-triggered cytotoxicity (IC-Ctx), two reactions which involve the Fcgamma-receptor but different lytic mechanisms. In vitro incubation of splenocytes from LPS-treated mice with anti-CD11b/CD18 abrogated ADCC and IC-Ctx enhancement, without affecting FcgammaR expression. Similar results were obtained with physiological concentrations of fibrinogen. In this way cytotoxic values of LPS-splenocytes decreased to the basal levels of control mice. Time and temperature requirements for such inhibition strongly suggested that anti-CD11b/CD18 could modulate intracellular signals leading to downregulation of FcgammaR functionality. Data presented herein support the hypothesis that functional and/or physical associations between integrins and FcgammaR could be critical for the modulation of effector functions during an inflammatory response.     

Activation of the PI3K/Akt/mTOR/p70S6K Pathway is Involved in S100A4-induced Viability and Migration in Colorectal Cancer Cells

The S100 protein family member S100A4 regulates various cellular functions. Previous studies have shown that elevated expression of S100A4 is associated with progression and metastasis of colorectal cancer (CRC). However, little is known about whether and how S100A4 contributes to CRC development. In our present study, the elevated expression of S100A4 in CRC tissues compared to matched adjacent normal tissues was confirmed by immunohistochemistry, semi-quantitative RT-PCR and Western blot. Adenovirus-mediated S100A4 overexpression obviously enhanced viability and migration of CRC cells, which was detected by MTT assay and transwell assay, respectively. Additionally, S100A4 overexpression increased the phosphorylation levels of Akt, mTOR and p70S6K. These effects of S100A4 were abolished by treatment with either the specific PI3K/Akt inhibitor {"type":"entrez-nucleotide","attrs":{"text":"LY294002","term_id":"1257998346","term_text":"LY294002"}}LY294002, or the specific mTOR/p70S6K inhibitor rapamycin. Furthermore, overexpression of S100A4 resulted in upregulation of VEGF and downregulation of E-cadherin, which were strongly reversed by either {"type":"entrez-nucleotide","attrs":{"text":"LY294002","term_id":"1257998346","term_text":"LY294002"}}LY294002 or rapamycin. Altogether, our results demonstrate that activation of the PI3K/Akt/mTOR/p70S6K signaling pathway is involved in S100A4-induced viability, migration, upregulation of VEGF and downregulation of E-cadherin in CRC cells.     

microRNA-214-3p在周期性张应变诱导内皮祖细胞分化和增殖中的作用

目的探讨microRNA-214-3p(miR-214-3p)在周期性张应变诱导内皮祖细胞(endothelial progenitor cells, EPCs)分化和增殖中的作用。方法采用FX-5000T细胞周期性张应变加载装置对EPCs施加生理水平的周期性张应变(5%幅度、1.25 Hz频率),加载时间24 h。应用miRNAs芯片筛选周期性张应变调控下差异表达的miRNAs,并挑选miR-214-3p进行深入研究。实时荧光定量PCR方法检测EPCs内平滑肌细胞(vascular smooth muscle cells, VSMCs)相标志分子的表达,BrdU结合酶联免疫吸附ELISA法检测EPCs增殖功能。之后,使用miR-214-3p抑制剂抑制miR-214-3p的表达,检测EPC内VSMC相标志分子表达及EPCs增殖。结果周期性张应变显著抑制miR-214-3p表达,并抑制EPCs向VSMC相分化,同时显著促进EPCs增殖。在静态条件下,使用miR-214-3p抑制剂干扰miR-214-3p的表达,miR-214-3p水平下降同样会抑制EPCs向VSMC相分化,并且诱导EPCs增殖能力显著上升。结论生理水平的周期性张应变能够抑制EPCs内miR-214-3p表达,从而抑制EPCs向VSMC相分化,并且促进EPCs增殖。研究结果为血管损伤的治疗提供新的治疗靶点。     

lncRNA PSMA3-AS1 靶向 miR-3619-5p 调控宫颈癌 SiHa 细胞增殖、迁移及侵袭的分子机制研究

目的 探讨 lncRNA PSMA3-AS1 调控宫颈癌细胞增殖、 迁移及侵袭的分子机制。 方法 收集 2020 年 3 月至 2021 年 6 月西安医学院第二附属医院收治的 42 例宫颈癌患者的癌组织及其癌旁组织标本, 采用 qRT-PCR 法检测宫颈癌组织、 癌旁组织、 人宫颈上皮永生化细胞 H8、 与人宫颈癌细胞系 SiHa、 HeLa、 Caski 中 lncRNA PSMA3-AS1、 miR-3619-5p 的表达量; 以 SiHa 细胞为研究对象, 分组为: si-NC 组、 si-lncRNA PSMA3-AS1 组、 miR-NC 组、 miR-3619-5p 组、 anti-miR-NC + si-lncRNA PSMA3-AS1 组、 anti-miR-3619-5p + si-lncRNA PSMA3-AS1 组; MTT 法与 Transwells 实验分别检测每组 SiHa 细胞的增殖活力、 迁移及侵袭能力; 双 荧光素酶报告实验检测 miR-3619-5p 过表达对野生型载体 lncRNA PSMA3-AS1-WT、 突变型载体 lncRNA PSMA3-AS1-MUT 荧光素酶活性的影响; Western 印迹检测 MMP2、 MMP9 蛋白表达量。 结果 宫颈癌组织中 lncRNA PSMA3-AS1 的表达量比癌旁组织增加 ( P < 0. 01), miR-3619-5p 的表达量比癌旁组织减少 ( P < 0. 01); 与 H8 细胞比较, SiHa、 HeLa、 Caski 细胞中 lncRNA PSMA3-AS1 的表达量升高 (P< 0. 01), miR-3619-5p 的表达量降低 (P< 0. 01); 与 si-NC 组比较, si-lncRNA PSMA3-AS1 组细胞活力和 MMP2、 MMP9 蛋 白水平降低 (P< 0. 05), 迁移及侵袭细胞数减少 (P< 0. 05); 与 miR-NC 组比较, miR-3619-5p 组细胞活力 和 MMP2、 MMP9 蛋白水平降低 (P< 0. 01), 迁移及侵袭细胞数减少 (P< 0. 05); miR-3619-5p 过表达可抑 制 lncRNA PSMA3-AS1-WT 的荧光素酶活性 (P< 0. 01), 而未能影响 lncRNA PSMA3-AS1-MUT 的荧光素酶活 性; 与 anti-miR-NC + si-lncRNA PSMA3-AS1 组比较, anti-miR-3619-5p + si-lncRNA PSMA3-AS1 组细胞活力和 MMP2、 MMP9 蛋白水平升高 (P< 0. 01), 迁移及侵袭细胞数增多 (P< 0. 01)。 结论 干扰 lncRNA PSMA3- AS1 表达可通过促进 miR-3619-5p 而降低宫颈癌细胞增殖、 迁移及侵袭能力。     

单启动子p53/p14ARF非融合表达载体的构建及其在MG-63中的表达鉴定

目的构建单启动子非融合表达载体pIRES-p53-p14~(ARF)并观察其对骨肉瘤细胞增殖生长的影响及其功能初探。方法将p53与p14~(ARF)全长cDNA编码区依次亚克隆至pIRES载体中,并通过PCR、酶切鉴定重组质粒。用Lipofectamin 2000将野生型pIRES-p53-p14~(ARF)真核表达载体转染MG-63细胞,48h后采用axiovent200型倒置显微镜、荧光免疫细胞化学,观察其在细胞内的表达并初步探究其抑瘤功能。结果成功构建出含p53与p14~(ARF)全长基因片段的单启动子非融合表达载体pIRES-p53-p14~(ARF)。RT-PCR,酶切鉴定质粒大小、位点均符合实验设计。荧光免疫细胞化学检测显示p53阳性细胞同时也表现为p14~(ARF)免疫反应阳性,转染后瘤细胞可见散在凋亡现象。结论pIRES-p53-p14~(ARF)非融合表达载体的构建与真核细胞导入、目的基因表达成功。     

p120-catenin缺失下调E-cadherin/β-catenin复合体在肺癌细胞系的表达

目的探讨catenin家族的重要成员p120-catenin(p120ctn)对E-cadherin介导的细胞粘附作用的调节及机制,检测在活体内外肺癌细胞系中p120ctn对E-cadherin/β-catenin复合体的调节作用。及其对肺癌细胞侵袭和转移能力的影响。方法应用siRNA技术建立p120ctn基因沉默的多种癌细胞系后,采用Western Blot,Transwell分析,裸鼠移植实验等方法进行检测。结果在成功干扰p120ctn表达的肺癌细胞系中,应用Western Blot和RT-PCR方法,我们观察到E-cadherin的蛋白表达出现不同程度的减弱,但mRNA的表达几乎没有变化;而β-catenin在蛋白和mRNA水平上都出现了明显的表达减弱。同时应用Transwell和裸鼠移植实验,我们在活体内外还观察到p120ctn缺失的肺癌细胞系具有较强的侵袭转移能力。结论肺癌细胞系中p120ctn的表达缺失可能通过下调E-cadherin和β-catenin的表达,参与肺癌细胞的侵袭和转移。     

miR-502-3p 通过靶向结合 CBL 抑制卵巢癌增殖并诱导凋亡

目的 探究微小 RNA 502-3p (micro RNA 502-3p, miR-502-3p) 通过靶向结合 Casitas B 细胞淋巴 瘤 (Casitas B-cell lymphoma, CBL) 参与卵巢癌增殖和凋亡的机制。 方法 下载 GSE66957、 GSE119056、 TCGA_ OV 卵巢癌相关数据矩阵, 分析 miR-502-3p、 CBL 与卵巢癌的关系; 构建过表达 miR-502-3p、 CBL 的 SKOV3 和 HO8910 细胞系, 分别采用细胞计数试剂盒 ( cell counting kit 8, CCK-8)、 克隆形成实验、 流 式细胞术检测细胞增殖和凋亡情况; 通过荷瘤裸鼠实验, 观察过表达 CBL 对肿瘤生长的影响; 验证 miR502-3p 与 CBL 的靶向关系。 结果 生物信息学分析显示, 卵巢癌组织中 CBL 水平高于癌旁组织, miR-502- 3p 水平低于癌旁组织, CBL 水平与患者预后、 细胞增殖基因表达有关 (P< 0. 05)。 miR-502-3p 与 CBL 存在 靶向关系, 与 Vector 组比较, CBL 组肿瘤的体积及重量增加 (P< 0. 05); 与 miR-NC 组比较, miR-502-3p 组 SKOV3、 HO8910 细胞中 CBL 蛋白表达、 细胞活力、 克隆数降低, 细胞凋亡率升高 (P< 0. 05), 但 CBL 可逆转上述细胞变化。 结论 miR-502-3p 可通过靶向下调 CBL 抑制卵巢癌细胞的增殖, 并诱导其凋亡。     

葛根素通过p42/44丝裂素活化蛋白激酶途径促进脑微血管内皮细胞增殖

目的:探讨葛根素对自发性高血压大鼠(SHR)脑微血管内皮细胞增殖的影响及其信号转导机制。方法:体外培养SHR及正常血压(WKY)大鼠脑微血管内皮细胞,随机分为(1)WKY对照组:以20%丙二醇孵育24h;(2)SHR对照组:同上处理;(3)葛根素组:SHR内皮细胞以不同浓度(25、50、100ng/L)葛根素分别孵育24h;(4)胎牛血清(FBS)组:SHR内皮细胞以10%FBS孵育24h;(5)PD98059+葛根素组:SHR内皮细胞以丝裂素活化蛋白激酶(MAPKs)抑制剂PD98059(50μmol/L)预孵育10min,再以100ng/L葛根素孵育24h;(6)蛋白磷酸酶激动剂(BDM)+葛根素组:培养的SHR内皮细胞以蛋白磷酸酶激动剂2,3-丁二酮肟(20mmol/L)预孵育10min,再以100ng/L葛根素孵育24h。采用[3 H]-胸腺嘧啶核糖核苷酸([3 H]-TdR)掺入法测定各组细胞增殖,采用免疫印迹法检测各组细胞p42/44MAPKs磷酸化水平。结果:50ng/L和100ng/L葛根素组SHR大鼠微血管内皮细胞[3H]-TdR掺入值较SHR对照组分别高74.1%和96.5%(均P0.05),与FBS组比较差异无统计学意义(P0.05)。PD98059和BDM+葛根素组[3 H]-TdR掺入值分别较100ng/L葛根素组低44.7%和47.5%(均P0.05),与SHR对照组水平无统计学差异(P0.05)。25、50和100ng/L葛根素组p42MAPK磷酸化水平较SHR对照组分别高25.0%、66.7%和75.0%(均P0.05),p44MAPK磷酸化水平较SHR对照组分别高17.8%、60.2%和62.7%(均P0.05)。PD98059和BDM+葛根素组p42MAPK和p44MAPK磷酸化水平均较100ng/L葛根素组明显下调(P0.05),而与SHR对照组差异无统计学意义(P0.05)。结论:葛根素能诱导SHR脑微血管内皮细胞增殖,其细胞内信号转导可能与p42/44MAPKs磷酸化途径有关。