RNA结合蛋白LIN28A对肝癌细胞转移能力的影响

目的研究LIN28A基因在肝肿瘤细胞及二乙基亚硝胺(DEN)诱导的大鼠原发性肝癌中的表达变化,揭示其在肝癌发生发展过程中的作用。方法利用实时荧光定量PCR(RT-PCR)检测肝癌细胞及DEN诱导的大鼠原发性肝癌模型中LIN28A信使核糖核酸(mRNA)的表达;以携带LIN28A的慢病毒(lentivirus)载体感染肝癌细胞,侵袭小室实验(transwell assay)检测过表达LIN28A对肿瘤细胞转移能力的影响。结果 RT-PCR结果显示,LIN28A在肝癌细胞及大鼠原发性肝癌中表达量上调;侵袭小室实验表明,过表达LIN28A能明显提高肝癌细胞的迁移和侵袭能力。结论 LIN28A在肝癌细胞中的表达升高,对肝癌细胞的转移能力具有促进作用。     

Auranofin modulates human neutrophil superoxide production and protein phosphorylation

Summary The effect of auranofin (AF) was examined on human neutrophil superoxide production and protein phosphorylation stimulated by phorbol esters. Low concentrations of auranofin (0.5 M) enhanced while higher concentrations (0.5–10 M) inhibited superoxide release stimulated by a suboptimal concentration (0.005 M) of phorbol myristate acetate (PMA). The enhancing but not the inhibitory effect of AF was lost if a maximal stimulating dose (0.05 M) of PMA was used. In contrast AF had a biphasic effect on protein phosphorylation regardless of the stimulating concentration of PMA. Comparison of the dose-response curves for these effects of AF suggest that although changes in protein phosphorylation may be partly responsible for altered activity of the NADPH oxidase responsible for superoxide production, it is unlikely that they are mediated by a direct effect of AF on protein kinase C. Also, measurement of ³H-PDBu-binding to neutrophils showed that these actions of AF could not be attributed to altered binding of phorbol esters to their cellular receptor (protein kinase C).     

Piroxicam and indometacin suppositories for painful coxarthrosis

Summary Six orthopaedic clinics in Sweden made a comparison of the effects and side effects of Piroxicam (20mg) and Indometacin (100mg) suppositories in 261 patients with painful coxarthrosis on the waiting list for total hip replacement (THR). The study was designed as a single blind study over 4 weeks. Amount of pain and range of motion was registered before the trial and compared with findings after 4 weeks, including reported side effects. Both drugs gave satisfactory pain relief without any appreciable variation on weightbearing or at rest. On the other hand, the trial showed a significant difference (p=0.0033, Student's-test) between the two drugs as regards the frequency of side effects from the lower gastrointestinal tract, where piroxicam had a lower rate compared with indometacin. No serious complications occurred; 16 patients dropped out, 8 in each group.     

Estradiol induces endothelial cell migration and proliferation through estrogen receptor-enhanced RhoA/ROCK pathway

Migration and proliferation of endothelial cells are involved in re-endothelialization and angiogenesis, two important cardiovascular processes that are increased in response to estrogens. RhoA, a small GTPase which controls multiple cellular processes, is involved in the control of cell migration and proliferation. Our aim was to study the role of RhoA on estradiol-induced migration and proliferation and its dependence on estrogen receptors activity. Human umbilical vein endothelial cells were stimulated with estradiol, in the presence or absence of ICI 182780 (estrogen receptors antagonist) and Y-27632 (Rho kinase inhibitor). Estradiol increased Rho GEF-1 gene expression and RhoA (gene and protein expression and activity) in an estrogen receptor-dependent manner. Cell migration, stress fiber formation and cell proliferation were increased in response to estradiol and were also dependent on the estrogen receptors and RhoA activation. Estradiol decreased p27 levels, and significantly raised the expression of cyclins and CDK. These effects were counteracted by the use of either ICI 182780 or Y-27632. In conclusion, estradiol enhances the RhoA/ROCK pathway and increases cell cycle-related protein expression by acting through estrogen receptors. This results in an enhanced migration and proliferation of endothelial cells.     

肝星状细胞移行及肝细胞间质变

肝星状细胞(HSC)是合成细胞外基质(ECM)的主要细胞,HSC的活化、增殖是肝纤维化发生的中心环节.新近研究结果显示,HSC移行到损伤部位或正常区域,对正常肝组织的愈合及肝纤维化形成起蕈要作用.     

Abl相互作用蛋白1过表达对胃癌细胞系AGS体外凋亡及迁移的影响

目的 研究Abl相互作用蛋白1(ABI1)过表达对人胃癌细胞系AGS体外凋亡及迁移的影响,初步探讨ABI1在胃癌发生发展中可能的作用机制.方法 首先应用脂质体转染方法分别将基因重组表达载体鼠干细胞病毒(MSCV)-绿色荧光蛋白(GFP)-ABI1质粒和对照载体MSCV-GFP质粒导入胃癌细胞系AGS,用嘌呤霉素筛选获得稳定表达MSCV-GFP-ABI1和MSCV-GFP的细胞系;其后应用流式细胞仪及Transwell小室检测ABI1过表达对AGS细胞体外凋亡及迁移能力的影响.结果 流式细胞仪检测显示,AGS细胞凋亡率与ABI1过表达后AGS细胞凋亡率无明显变化,差异无统计学意义(P＞0.05);Transwell小室检测显示,AGS细胞迁移能力与ABI1过表达后AGS细胞迁移能力比较差异有统计学意义(P＜0.01).结论 ABI1过表达抑制胃癌细胞系AGS的体外迁移能力,提示影响胃癌细胞的迁移可能是ABI1在胃癌发生发展中发挥作用的重要途径之一.     

普伐他汀对骨髓间充质干细胞迁移和黏附能力的影响

目的观察普伐他汀干预对人骨髓间充质干细胞(bone marrow mesenchymal stem cells,BMMSCs)迁移和黏附能力的影响及其相关细胞信号传导通路。方法使用普伐他汀干预体外培养的第6代人BMMSCs,Western blotting检测作用前后ERK1/2、p38MAPK及PI3K/Akt通路蛋白的表达情况。将10μmol/L普伐他汀预处理人BMMSCs1h后,通过Transwell小室进行细胞迁移实验,并进行细胞黏附性测定,进一步用特异的细胞信号通路抑制剂或激动剂阻断或激活ERK1/2、p38MAPK及PI3K/AKT途径,观察其对普伐他汀作用的影响。结果普伐他汀可使人BMMSCs的PI3K/Akt通路磷酸化水平升高,抑制p38MAPK通路磷酸化水平,而其对人BMMSCs的ERK通路和总Akt、总p38MAPK水平无显著影响。经普伐他汀作用后迁移细胞显著增多(P<0.05),Ly294002预处理后这种作用消失,anisomycin预处理对这种作用影响不明显。普伐他汀作用后贴壁细胞显著增多(P<0.05),但Ly294002或anisomycin预处理对这种作用影响均不明显。结论普伐他汀具有增强人BMMSCs迁移和黏附能力的作用。其增强迁移能力的作用与激活人BMMSCs的PI3K/Akt通路有关。但是它对黏附能力的作用与PI3K/Akt和p38MAPK通路均无关。     

细胞自噬与结肠癌Lovo细胞迁移和侵袭的相关性研究

目的探讨不同自噬状态对结直肠癌Lovo细胞迁移和侵袭能力的影响。 方法将Lovo细胞分为自噬增强组、正常细胞组和3-甲基嘌呤自噬抑制组。用激光共聚焦显微镜观察绿色荧光颗粒,用Q-PCR检测Beclin1 mRNA表达水平,透射电镜观察自噬溶酶体,Transwell实验评价Lovo细胞迁移与侵袭能力。 结果绿色荧光颗粒数以自噬增强组最多,其次为正常细胞组,而自噬抑制组最少。Beclin1 mRNA表达量自噬增强组为(1.23±0.12)个,正常细胞组为(1±0.13)个,自噬抑制组为(0.98±0.1)个。自噬增强组可见大量的自噬溶酶体,明显多于正常细胞组和自噬抑制组。迁移实验细胞计数：自噬增强组高于正常细胞组(138.0±16.7与90.7±12.9,P＝0.026)和自噬抑制组(138.0±16.7与92.7±26.7,P＝0.030)。侵袭实验细胞计数：自噬增强组高于正常细胞组(147.0±13.0与99.0±20.5,P＝0.028)和自噬抑制组(147.0±13.0与95.7±25.6,P＝0.021)。 结论结肠癌Lovo细胞自噬增强促进肿瘤细胞迁移和浸润,可能是局部浸润和远处转移的机制之一。     

Piroxicam and naproxen in patients with osteoarthritis of the hip waiting for total hip replacement

Summary Two-hundred and fifty-two patients waiting for a total hip replacement for degenerative hip disease were randomized to two groups of nonsteroidal anti-inflammatory medication using piroxicam, 20 mg per day, and naproxen, 750 mg per day, after exclusion for severe dyspepsia or peptic ulcer, asthma, idiosyncracy, dissent, age below 50 years, Harris hip score above 50, or significant contralateral disease. A significant improvement in the pain and daily activity parameters was obtained in both groups. The effect was better in the piroxicam group one month after the commencement of the treatment, and equal in the groups later during the observation period of 2–5 months. We conclude that continuous medication is beneficial in patients with severe osteoarthritis scheduled for operation. However, the side effects of the medication have to be carefully considered and followed up.     

与膜-细胞骨架连接蛋白家族结合的磷酸化蛋白50对血管内皮细胞增殖、迁移及成管能力的影响

目的探讨与膜-细胞骨架连接蛋白家族结合的磷酸化蛋白50(EBP50)对人脐静脉内皮细胞(HUVEC)内Akt1磷酸化水平、细胞分泌明胶酶的活性以及细胞骨架表达和分布的影响,阐明其影响人血管内皮细胞增殖、迁移及成管的分子机制。方法构建EBP50的真核重组表达载体,将重组质粒分别稳定转染HUVEC细胞系,经Western blot法验证后,采用MTT法检测细胞的增殖活性;应用划痕法检测细胞的迁移能力;应用Matrigel法检测细胞的成管能力;应用Western blot检测EBP50对Akt1磷酸化水平的影响;应用明胶酶谱法检测HUVEC细胞分泌的明胶酶活性;应用免疫荧光观察细胞骨架的分布。结果转染的外源性EBP50 cDNA片段已整合到基因组中;与对照组细胞比较,EBP50能显著抑制细胞的增殖、迁移及成管能力,并且EBP50明显下调Akt1的磷酸化水平(t=2.98,P<0.01);同时使HUVEC分泌的MMP2活性下降,并影响血管内皮细胞内细胞骨架的分布。结论EBP50可以抑制HUVEC细胞的增殖、迁移及成管,其机制可能与调整Akt1的磷酸化水平、调节细胞分泌明胶酶的活性及影响微丝细胞骨架分布有关。     

尼古丁对人A549细胞增殖、侵袭和迁移能力的影响

目的 观察烟草烟雾中的主要有害成分尼古丁对人A549细胞增殖、迁移与侵袭能力的影响,探讨尼古丁致病的可能机制.方法 以一定浓度尼古丁刺激体外培养的人A549细胞,应用CCK-8法、Transwell法和细胞划痕实验分别检测A549细胞的增殖、侵袭及迁移能力.Western blot检测α7烟碱型乙酰胆碱受体(α7 nAChR)、血管内皮生长因子(VEGF)和基质金属蛋白酶2(MMP-2)蛋白的表达.结果 与空白对照组比较,10-6 mol/L尼古丁处理A549细胞后,促进人A549细胞增殖(t=7.920,P<0.05);使穿过基质胶的细胞数增多,侵袭能力增强(t=5.298,P<0.05);使细胞迁移率增加,迁移能力增强(P<0.05).与空白对照组比较,10-6 M尼古丁处理A549细胞24 h后,α7 nAChR、VEGF和MMP-2蛋白表达上调,差异有统计学意义(t值分别为5.800、4.074、6.851,P值均<0.05).结论 尼古丁通过其特异性受体α7 nAChR可增强人A549细胞的增殖、侵袭和迁移能力,其机制可能与VEGF和MMP-2蛋白表达上调有关.     

HERG1钾通道在胰腺癌组织中的表达及对PANC1细胞增殖、迁移能力的影响

G1钾离子通道在胰腺癌和胰腺癌细胞株中过表达,且与肿瘤细胞的增殖、侵袭和迁移有关.     

The effect of auranofin and sulphasalazine therapy on circulating levels of interleukin 6 in rheumatoid arthritis patients

Summary Serum levels of interleukin 6 (IL-6), primarily a macrophage derived cytokine and soluble interleukin 2 receptor (sIL-2R), a marker of lymphocyte activation are elevated in rheumatoid arthritis (RA). We have found that the second line drugs auranofin (AUR) and sulphasalazine (SASP) do not significantly alter circulating levels of sIL-2R implying that these durgs do not influence lymphocyte activity. The effect of AUR and SASP on IL-6 is not established. In RA patients we have investigated the effect of these second line agents on serum II-6 levels.Using the B9 bioassay, serum IL-6 was sequentially measured at 0 and 12 weeks in RA patients treated with auranofin (n=26) or sulphasalazine (n=20). Clinical and laboratory indices of disease activity were also assessed. In patients receiving either AUR or SASP, serum IL-6 was significantly reduced. This reduction was parallelled by improvement in clinical indices of disease activity. AUR and SASP significantly reduce serum IL-6 levels in RA patients receiving these treatments. Combining one of these agents with a drug that also influences sIL-2R may be a more rational approach to combining second line therapy in RA.     

Effect of aged bone marrow microenvironment on mesenchymal stem cell migration

Mesenchymal stem cells (MSCs) are known to have many notable features, especially their multiple differentiation ability and immunoregulatory capacity. MSCs are important stem cells in the bone marrow (BM), and their characteristics are affected by the BM microenvironment. However, effects of the BM microenvironment on the properties of MSCs are not well understood. In this study, we found that BM from aged mice decreased MSC colony formation. Flow cytometry data showed that the proportion of B220⁺ cells in BM from aged mice was significantly lower than that in BM from young mice, while the proportion of CD11b⁺, CD3⁺, Gr-1⁺, or F4/80⁺ cells are on the contrary. CD11b⁺, B220⁺, and Ter119⁺ cells from aged mice were not the subsets that decreased MSC colony formation. We further demonstrated that both BM from aged mice and young mice exhibited similar effects on the proliferation of murine MSC cell line C3H10T1/2. However, when cocultured with BM from aged mice, C3H10T1/2 showed slower migration ability. In addition, we found that phosphorylation of JNK (c-Jun N-terminal kinases) in C3H10T1/2 cocultured with BM from aged mice was lower than that in C3H10T1/2 cocultured with BM from young mice. Collectively, our data revealed that BM from aged mice could decrease the migration of MSCs from their niche through regulating the JNK pathway.     

三氧化二砷诱导胰腺癌细胞系PC-3凋亡及其抑制转移的作用

目的:探讨三氧化二砷(亚砷酸,As2O3)注射液诱导人类胰腺癌细胞凋亡及其抑制转移的作用机制.方法:用AS2O3处理人胰腺癌细胞株PC-3,通过流式细胞仪观察细胞的凋亡率及生长周期的变化;用免疫组织化学的方法,检测凋亡相关基因蛋白Fas,Fas-L,Bc1-2和Bax及转移相关基因蛋白CD44和nm23表达的变化.结果:流式细胞仪检测显示明显的凋亡峰出现,并使细胞周期主要被阻滞在S期(14.9%-63.7%);免疫组化结果显示,Bc1-2( ～ ),CD44( ～ )基因的表达下调,Fas( ～ )、Fas-L(-～ )及nm23( ～ )基因的表达上调.结论:As2O3注射液可诱导人类胰腺癌细胞株PC-3凋亡并具有抑制转移作用,这可能与调节Bc1-2,Fas,Fas-L及CD44,nm23蛋白的表达有关.     

二甲双胍对人胰腺癌细胞迁移的抑制作用

目的:研究二甲双胍对胰腺癌细胞迁移的影响,并初步探讨可能机制.方法:体外培养人胰腺癌细胞株Bxpc-3,予二甲双胍进行干预作为实验组(M组),无药物组作为对照组(C组).MTT检测二甲双胍对Bxpc-3细胞存活率的影响,细胞划痕实验检测划痕愈合率,RT-PCR检测MMP-2、MMP-9 mRNA的表达,Elisa检测细胞培养上清液MMP-2、MMP-9蛋白的分泌量.结果:与对照组相比,MTT结果示二甲双胍可以抑制人胰腺癌细胞株Bxpc-3的增殖,并呈时间-浓度依赖性(F=8.991,124,114.61,P<0.01);划痕实验示二甲双胍干预组12、24、48h与对照组相比划痕愈合率显著下降(t=7.683,9.013,10.471,P<0.01);RT-PCR示二甲双胍干预组MMP-2、MMP-9mRNA的表达显著降低(t=16.563,28.494,P<0.01);Elisa示二甲双胍干预组MMP-2、MMP-9蛋白分泌明显下降(t=9.428,13.542,P<0.01).结论:二甲双胍能显著抑制人胰腺癌细胞株Bxpc-3的增殖及迁移,其主要机制可能与抑制MMP-2、MMP-9活性有关.     

The effect of gold treatment on monocyte interleukin-1 production in rheumatoid arthritis

Summary Monocyte interleukin-1 (IL-1) production in vitro was studied in 49 patients with rheumatoid arthritis (RA) and 31 controls. Twenty-six of the RA patients were studied prospectively for up to 12 months after beginning chrysotherapy. About half of the patients (group 1) exhibited pretreatment levels of monocyte IL-1 secretion (as measured by bioassay or B-IL-1) significantly higher than that of the controls. Immunoreactive IL-1 (IR-IL-1) levels, however, were similar to controls. Clinical improvement in this group of patients was modest and transient but could be associated with a fall in the level of IL-1 (B-IL-1 and IR-IL-1) secretion. Other RA patients (group 2) appeared to have normal or reduced pretreatment levels of IL-1 secretion. Chrysotherapy resulted in significant clinical improvement within 3 months, and this was associated with an increase in IL-1 (both B-IL-1 and IR-IL-1) secretion by the patients' blood monocytes to normal or supranormal levels. Thus these two groups of RA patients (which differed only in the average duration of disease) had different prognoses in relation to chrysotherapy and the effect of chrysotherapy-induced remission on monocyte IL-1 secretion was opposite. These results suggest that monocyte IL-1 production in vitro reflects changes secondary to the anti-rheumatic effects of chrysotherapy.Deceased     

Fas通路的激活促进结肠癌细胞迁移侵袭

目的探讨Fas通路激活对结肠癌细胞SW480和DLD1产生的非凋亡效应。方法流式细胞学检测结肠癌SW480及DLD1细胞系的Fas、FasL、抗凋亡蛋白c-FLIP、Bcl-2、Bcl-xl、XIAP等在细胞膜上的表达水平;对结肠癌SW480及DLD1细胞系予以梯度浓度（0ng/ml、12.5ng/ml、25ng/ml、50ng/ml）的FasL刺激,计数并比较各组细胞的增殖速率变化;对结肠癌SW480及DLD1细胞系予以低剂量FasL处理,分别对实验组和对照组进行细胞增殖速率及迁移侵袭能力测试,探讨低剂量FasL刺激对结肠癌细胞活力的影响;稳定敲除SW480和DLD1细胞的Fas基因表达,重复上述实验,以明确低剂量FasL刺激对结肠癌细胞活力的影响是否依赖于Fas通路的激活。结果 SW480及DLD1细胞系中均可检测到中等程度的Fas表达及抗凋亡蛋白FLIP、Bcl-2的表达,未检测到FasL表达,在SW480中可测到Bcl-xl表达;低剂量FasL不影响结肠癌SW480和DLD1细胞的增殖速率,但可促进两种细胞的迁移侵袭能力;稳定敲除Fas基因后,低剂量FasL对结肠癌细胞迁移侵袭能力的促进作用受到抑制。结论低剂量FasL可激活Fas通路的非凋亡途径从而增强结肠癌SW480和DLD1细胞的迁移侵袭能力。     

IL-22对人气道细胞的作用

目的 探讨IL-22对人气道上皮细胞、气道平滑肌细胞、气道成纤维细胞的生理学作用.方法 用实时定量PCR 检测气道上皮细胞、气道平滑肌细胞、气道成纤维细胞哮喘血清刺激前后IL-22R1 mRNA表达的变化.不同浓度的IL-22(10 ng/ml,100 ng/ml,1 000 ng/ml)刺激气道上皮细胞、气道平滑肌细胞和气道成纤维细胞后,用MTT法检测细胞的增殖,用流式细胞技术(FACS)检测细胞的凋亡和坏死.结果 哮喘血清刺激后气道上皮细胞IL-22R1 mRNA表达降至正常对照组的9%,气道平滑肌细胞IL-22R1 mRNA表达升高至正常对照组的345倍,而气道成纤维细胞IL-22R1 mRNA表达无明显变化.高剂量(1 000 ng/ml)的IL-22刺激气道上皮细胞和气道成纤维细胞12、24 h可显著降低细胞增殖(P<0.05,P<0.01).三种不同浓度的IL-22刺激气道上皮细胞24 h后均导致细胞凋亡显著下降(P<0.05),低浓度的IL-22(10 ng/ml)导致细胞坏死增加(P<0.01).不同浓度的IL-22刺激气道平滑肌细胞后,细胞凋亡和坏死无显著性变化.中、高浓度IL-22(100 ng/ml,1 000 ng/ml)刺激气道成纤维细胞后,细胞坏死率显著下降(P<0.05).结论 IL-22在支气管哮喘中对气道上皮的作用具有双重性,并与支气管哮喘的病程相关;而对气道平滑肌细胞的作用则可能与浓度及病程相关.支气管哮喘后续阶段,IL-22对气道成纤维细胞作用轻微.     

Overexpression of Csk-binding protein decreases growth,invasion,and migration of esophageal carcinoma cells by controlling Src activation

AIM:To investigate the mechanisms by which Cskbinding protein(CBP)inhibits tumor progression in esophageal carcinoma.METHODS:A CBP overexpressing esophageal carcinoma cell line(TE-1)was established.The growth,invasion,and migration of CBP-TE-1 cells,as well as the expression of Src were then determined and compared with those in normal TE-1 cells.RESULTS:The expression of Src was decreased by the overexpression of CBP in TE-1 cells.The growth,invasion,and migration of TE-1 cells were decreased by the overexpression of CBP.CONCLUSION:This study indicates that CBP may decrease the metastasis of esophageal carcinoma by inhibiting the activation of Src.CBP may be a potential tumor suppressor and targeting the CBP gene may be an alternative strategy for the development of therapies for esophageal carcinoma.