三氧化二砷对恶性黑色素瘤A375细胞端粒酶活性的抑制作用

背景与目的 :研究三氧化二砷(As2O3)对人恶性黑色素瘤A375 细胞端粒酶活性的抑制作用,探讨砷及其化合物治疗恶性黑色素瘤的作用机制 ,为砷及其化合物治疗恶性黑色素瘤提供新的理论和实验依据。 材料与方法 :用TRAP_ELISA和TRAP_PAGE银染法测定A375 细胞端粒酶活性。结果 :As2O3 对人恶性黑色素瘤A375 细胞端粒酶活性抑制有明显的浓度和时间依赖关系。结论 :As2O3 对恶性黑色素瘤A375 细胞端粒酶活性抑制率随药物浓度的增加或作用时间的延长而提高     

白藜芦醇对黑色素瘤细胞增殖的抑制作用

目的:探讨白藜芦醇对黑色素瘤细胞WM239增殖、细胞周期及凋亡的影响。方法:MTT法检测白藜芦醇对WM239细胞增殖的影响;流式细胞术检测白藜芦醇对WM239细胞周期及凋亡的影响。结果:12.5～200μmol/L的白藜芦醇作用于WM239细胞48h和72h后,对其增殖具有一定的抑制作用,作用72h时,浓度>50μmol/L其抑制率>50%,且抑制程度与药物浓度呈正相关。其中0、25、50和100μmol/L药物与WM239细胞作用48h后,凋亡率分别为0.1%、9.7%、8.9%和19.3%,处理组与未处理组相比细胞凋亡明显增加,G0/G1期细胞分别为71.9%、77.3%、81.0%和83.7%,S期分别为21.5%、17.9%、16.0%和14.6%,G2/M期为6.5%、4.8%、2.9%和1.8%,细胞周期阻滞于G1期,S期和G2期细胞比例下降,剂量依赖关系明显。结论:白藜芦醇可以抑制WM239细胞的增殖,引起细胞周期改变,凋亡细胞明显增加。     

缺乏葡萄糖和谷氨酰胺对黑色素瘤A375细胞增殖与凋亡的影响

目的:探讨体外培养条件下,缺乏葡萄糖(No-Glu)或谷氨酰胺(No-Gln)对黑色素瘤细胞生长和凋亡的影响.方法:分别利用MTT、流式细胞术、化学发光、Western blotting以及免疫荧光染色等方法检测No-Glu和No-Gln对人恶性黑色素瘤A375细胞初级纤毛形成、增殖、ATP含量、细胞周期以及细胞凋亡等多方面的影响.结果:在No-Glu或No-Gln培养液中培养,A375细胞的细胞增殖率显著低于对照组(正常培养液)[(21.0±1.9)％或(46.2±9.8)％ vs 100％,P＜0.01或P＜0.05].No-Gln培养液使A375细胞纤毛形成阳性细胞率显著高于对照组[(16.8±2.3)％vs(6.2±1.0)％,P＜0.01],G1期细胞减少(14.4±6.7)％(P＜0.05)、S期细胞增加(75.0±1.9)％(P＜0.05).No-Glu培养液对A375细胞纤毛形成与G1和S期细胞比例均无显著影响.此外,No-Gln使A375细胞内ATP含量下调了(64.5±4.9)％(P＜0.01),而No-Glu仅使ATP含量下降了(11.1±2.1)％(P＞0.05).No-Glu使A375细胞的凋亡率显著高于对照组[(26.1±1.5)％vs(6.1±7.1)％,P＜0.01],并上调促凋亡蛋白Noxa、降低抗凋亡蛋白Mcl-1的表达水平.No-Gln对细胞凋亡率、Noxa和Mcl-1蛋白表达无明显影响.结论:No-Glu或No-Gln均可抑制A375细胞增殖,但No-Gln导致S期细胞周期阻滞、抑制ATP合成的作用更明显,而No-Glu诱导细胞凋亡的作用更强.     

三氧化二砷诱导恶性黑色素瘤A375和B16细胞凋亡的研究

目的: 研究不同浓度的三氧化二砷(As-2O-3)对恶性黑色素瘤人A-{375}细胞和小鼠B-{16}细胞的凋亡诱导作用,为As-2O-3治疗恶性黑色素瘤提供新的理论和实验依据.方法:用流式细胞术(FCM)检测A-{375}细胞和B-{16}细胞的凋亡诱导及杀伤作用:用不同剂量的As-2O-3(0.1 mmol*L{-1}、0.25 mmol*L{-1}和0.5 mmol/L{-1}),对小鼠进行腹腔注射(10 ml*kg{-1},连续注射10 d后,检测小鼠血清与心、肝、肾有关的生化指标.结果:As-2O-3浓度分别为5 μmol*L{-1}、10 μmol*L{-1}和20 μmol*L{-1}时,A-{375}和B-{16}细胞的凋亡率分别为11.85 %、55.51 %、54.90 %和9.81 %、26.45 %、9.93 %:As-2O-3诱导A-{375}和B-{16}细胞总的凋亡和坏死率分别为11.90 %、55.71 %、57.40 %和12.96 %、26.99 %、87.13 %;不同剂量的As-2O-3(0.1 mmol*L{-1}～0.5 mmol*L{-1})对小鼠肝、肾和心肌等功能无明显影响,与对照组各项指标无显著性差异(P>0.05).结论:不同浓度的As-2O-3能明显诱导恶性黑色素瘤A-{375}及B-{16}细胞凋亡和坏死,对A-{375}细胞的凋亡诱导作用强于B-{16}细胞.As-2O-3(0.1 mmol*L{-1}～0.5 mmol*L{-1})对小鼠肝、肾和心肌等功能无明显损伤.     

恶性黑色素瘤组织AURKA表达对细胞增殖和迁移的影响

目的 探讨极光激酶A(AURKA)在恶性黑色素瘤组织中的表达以及对黑色素瘤细胞增殖、凋亡以及迁移的影响.方法 收集2018-01-01-2021-01-01在宁夏医科大学总医院病理科储存的30例原位及转移性黑色素瘤组织,免疫组织化学法检测AURKA在正常皮肤组织、原位以及转移性黑色素瘤组织中的表达水平.分别选用来源于同...     

辣椒素诱导人黑色素瘤A375-S2细胞凋亡的研究

目的研究辣椒素对人黑色素瘤A375-S2细胞凋亡的诱导作用,探讨其抗癌作用机制。方法采用噻唑蓝（MTT）法观察辣椒素对细胞生长的抑制作用,荧光显微镜下观察细胞的形态学变化,通过DNA凝胶电泳进行DNA片段化分析,流式细胞术检测细胞凋亡,Western blot法分析DNA酶抑制剂（ICAD）蛋白的表达。结果辣椒素可诱导A375-S2细胞凋亡,呈剂量、时间依赖性。250μmol／L辣椒素处理24h,A375-S2细胞出现明娩的亚二倍体峰;处理36h,Hoechst 33258荧光染色有明显的凋亡小体出现,DNA电泳出现阶梯状图谱。在辣椒素作用下,caspase激活的ICAD蛋白表达量随时间延长而减少。结论辣椒素对A375-S2细胞的杀伤作用主要通过诱导细胞凋亡实现,降低ICAD蛋白的表达为其诱发A375-S2细胞凋亡的机制之一。     

TNF-α诱导小鼠B16黑色素瘤细胞凋亡及其对小鼠B16细胞移植瘤生长的抑制作用

目的:探讨TNF-α对小鼠B16黑色素瘤(MM)细胞凋亡的诱导及其对小鼠B16移植瘤生长的抑制作用.方法:用不同浓度的TNF-α直接作用于培养的小鼠B16黑色素瘤细胞,36h后,采用流式细胞仪(FCM)及原位末端标记法(TUNEL法)检测B16细胞的凋亡率.动物实验观察TNF-α小量瘤体内注射对小鼠B16移植瘤生长的抑制作用.结果:在1000、3000、5000及10000U/mL TNF-α作用下,B16细胞的凋亡指数均明显高于空白对照组(P＜0.01),随着TNF-α浓度增加,B16凋亡细胞数呈增加趋势.动物实验结果显示,TNF-α治疗3周后,治疗组荷瘤小鼠MM移植瘤的体积和重量明显低于对照组(P＜0.01).结论:TNF-α能够诱导小鼠B16黑色素瘤细胞发生凋亡,且小剂量TNF-α瘤体内注射能显著抑制小鼠移植性MM的生长.     

微小RNA-27 a对黑色素瘤WM239细胞增殖和凋亡的影响

目的：探讨微小RNA-27a（ miR-27a）模拟物和抑制物转染黑色素瘤WM239细胞后对细胞增殖和凋亡的影响。方法将miR-27a模拟物、抑制物及其阴性对照转染WM239细胞,荧光显微镜观察转染效率,实时荧光定量PCR检测相应的微小RNA,四甲基偶氮唑盐（ MTT）法检测细胞增殖,流式细胞仪检测细胞凋亡和细胞周期。结果细胞转染效率为80%~90%。转染miR-27a模拟物后,细胞内miR-27a表达量明显上升（2-△△CT值为26.98±0.01）,与正常对照组相比差异有统计学意义（ t＝－1123.67,P＝0.00）;转染miR-27a抑制物后,细胞中miR-27a的表达量下降（2-△△CT值为0.96±0.02）,与正常对照组相比差异无统计学意义（t＝4.04,P＝0.06）。转染miR-27a模拟物后,细胞增殖受到明显抑制,与正常对照组相比差异具有统计学意义[72 h吸光度（0.45±0.02）∶（0.72±0.01）,F＝129.56,P﹤0.05]。miR-27a模拟物组G0-G1期的细胞比例升高[（74.83±1.46）∶（63.73±1.25）,F＝30.33,P﹤0.05],S期和G2-M期细胞比例减少[（21.33±1.75）∶（27.50±1.25）,F＝14.98,P﹤0.05;（3.90±1.31）∶（8.80±2.10）,F＝3.66,P﹤0.05];模拟物组细胞凋亡率与正常对照组相比明显增加[（29.67±0.91）%∶（1.44±0.85）%, F＝530.90,P﹤0.01];而抑制物组对细胞周期和凋亡无明显作用。结论 miR-27a抑制黑色素瘤细胞增殖,具有抑瘤作用,这与其促进细胞凋亡,阻滞细胞周期于G0-G1期相关。     

加热处理后人黑色素瘤A375细胞对NK和DC细胞免疫活性的影响

目的： 研究经加热处理的人黑色素瘤细胞A375对外周血单个核细胞来源的自然杀伤(NK)细胞及树突状细胞(DC)免疫活性的影响并探讨其作用机制。方法：体外培养人外周血单个核细胞来源的NK和DC细胞,并使其与43 ℃水浴加热后的A375细胞共孵育24 h。应用CCK-8法测定加热和非加热组效靶比(NK∶DC∶A375)分别为1∶2∶1、3∶6∶1、6∶12∶1时NK/DC细胞的杀伤率;应用酶联免疫吸附法(ELISA)检测上述各效靶比组NK细胞培养液中γ-干扰素(γ-INF)的释放情况。结果：在每个效靶比,与非加热组比较,加热组NK/DC的杀伤率均明显提高(P<0.05),且其杀伤率随NK/DC细胞的浓度升高而升高(P<0.05)。在加热组和非加热组,含有DC较不含DC组杀伤率均明显提高(P<0.05)。加热组NK细胞γ-INF释放均较非加热组明显增加(P<0.05)。结论：经加热处理后的黑色素瘤细胞A375能够刺激NK细胞分泌更多的γ-INF,明显提高NK细胞的杀伤活性,且DC在其中起着重要作用。     

lncRNA LOC572558对恶性黑素瘤细胞增殖及侵袭的影响

目的:探讨长链非编码RNA（long non-coding RNA,lncRNA）LOC572558对恶性黑素瘤细胞增殖、迁移及侵袭能力的影响。方法:使用定量实时聚合酶链式反应（qRT-PCR）检测LOC572558在20对恶性黑素瘤及癌旁组织中以及在NHEM、A375、A2058和B16细胞系中的表达。应用小干扰 RNA（siRNA）技术下调 LOC572558表达后,在A375和B16细胞系中使用流式细胞术评估细胞凋亡情况,划痕实验检测细胞的迁移能力,Transwell小室法检测细胞的侵袭能力。结果:lncRNA LOC572558在恶性黑素瘤组织及细胞系中高表达,且下调lncRNA LOC572558表达可以促进A375和B16细胞的凋亡,抑制A375和B16细胞的迁移及侵袭能力。结论:lncRNA LOC572558有望成为临床早期诊断恶性黑素瘤潜在分子标志物以及治疗晚期恶性黑素瘤的靶向标志物。     

中药对恶性肿瘤患者T细胞亚群影响的研究进展

大量研究表明中药对恶性肿瘤患者T细胞亚群具有免疫增强作用。本文就中药对恶性肿瘤患者T细胞亚群的免疫增强作用的相关研究进行了总结,从单味中药、复方中药、中药有效成分、中成药四个方面进行论述。并对中药的免疫增强作用进行了总结展望。     

Linc00961在恶性黑素瘤中表达及其对细胞侵袭及转移的影响

目的:检测潜在长链非编码RNA Linc00961在恶性黑素瘤组织及细胞中的表达,及其对恶性黑素瘤A375细胞迁移和侵袭能力的影响。方法:采用聚合酶链式反应方法检测恶性黑素瘤组织及细胞中Linc00961的表达水平;分析Linc00961在不同TNM分期恶性黑素瘤组织中的表达;构建Linc00961过表达慢病毒质粒上调A375细胞中Linc00961表达,细胞划痕实验检测Linc00961对A375细胞迁移距离的影响,Transwell实验检测Linc00961对A375细胞迁移侵袭的影响。结果:Linc00961在恶性黑素瘤组织及A375细胞中的表达低于良性痣及正常黑素HEMa-LP细胞。TNM IV期恶性黑素瘤组织中的Linc00961表达水平显著低于TNM I、II、III期。过表达A375细胞中Linc00961后,细胞迁移距离降低,细胞迁移及侵袭数目减少（P<0.05）。结论:Linc00961在恶性黑素瘤组织及细胞中低表达,并可抑制恶性黑素瘤细胞迁移及侵袭。     

Concentration-dependent effects of N1, N11-diethylnorspermine on melanoma cell proliferation

N1, N11-diethylnorspermine (DENSPM) is a polyamine analog that is currently under investigation as a novel anticancer drug. Although it has shown promising preclinical activity, there has been large variation in responsiveness reported between different human cancers. During our studies into the causes of this variation, we observed a consistent increase in cell proliferation at low drug concentrations (<10 microM) in human melanoma cells resistant to the drug. At higher concentrations, growth inhibition was seen in all cell lines, with IC50 values ranging 2-180 microM. We hypothesized that DENSPM may mimic endogenous polyamines at low concentrations, supporting cell growth in resistant lines. We also observed that DENSPM downregulated polyamine transport in a manner similar to that for spermidine, a finding that confirms previous reports. Finally, DENSPM could rescue cells from growth arrest by the ornithine decarboxylase inhibitor difluoromethylornithine, which depletes intracellular polyamines. Taken together, these results suggest that DENSPM, at clinically relevant concentrations, can mimic endogenous polyamines and induce proliferation in resistant human melanoma cells.     

盐霉素对人黑色素瘤M21细胞增殖及自噬流的影响

目的 探讨盐霉素对人黑色素瘤M21细胞增殖及自噬流的影响。方法 采用MTS法检测细胞生存率,计算半数抑制浓度IC₅₀值。观察给药后细胞形态学变化。采用流式细胞仪检测细胞的凋亡率。Western blot检测给药后M21细胞内自噬相关蛋白LC3B表达情况。透射电镜下观察给药后M21细胞内是否有自噬小体产生。Western blot和免疫荧光检测p62蛋白水平和定位变化。结果 盐霉素对人黑色素瘤M21细胞具有明显的增殖抑制作用,IC₅₀值为(1.38±0.18)μM。给药后细胞增殖速度减慢,同时细胞中出现明显的空泡。盐霉素不能促进细胞发生凋亡,但能使细胞内LC3B-Ⅱ/LC3B-Ⅰ的比值逐渐增加。在透射电镜下观察到自噬小体的增多与堆积。盐霉素作用后p62蛋白水平些许升高,逐渐在胞质内聚集成团状,表明自噬流被抑制。结论 盐霉素能够抑制人黑色素瘤M21细胞的增殖,其机制可能与诱导自噬小体增多、抑制自噬流有关。     

Triptolide inhibits proliferation and induces apoptosis of human melanoma A375 cells

Triptolide, a diterpenoid obtained from Tripteryglum wilfordii Hook.f, has attracted interest for its anti- tumor activities against human tumor cell lines in recent years. This report focuses on anti-proliferative and pro-apoptotic activities in human melanoma A375 cells assessed by CCK8 assay, Hoechst 33258 staining and flow cytometry. In addition, triptolide-induced arrest in the S phase was also observed. Caspase assays showed the apoptosis induced by triptolide was caspase-dependent and probably through intrinsic apoptotic pathways. Furthermore, expression of NF-κB (p65) and its downstream factors such as Bcl-2, Bcl-XL was down-regulated. Taken together, the data indicate that triptolide inhibits A375 cells proliferation and induces apoptosis by a caspase-dependent pathway and through a NF-κB-mediated mechanism.     

Cytokine sensitivity of metastatic human melanoma cell lines -simultaneous inhibition of proliferation and enhancement of gelatinase activity

The effect of a panel of cytokines on the proliferation and type IV collagenase production was studied in four melanoma cell lines of different origin, tumorigenicity and metastatic capacity. TGF-β, TNF-α and to a lesser extent, IL-lα exhibited antiproliferative effect on the cell lines, with some lines showing varying degree of resistance. The sensitivity did not correlate directly with the origin or the biological behavior of the tumor lines, suggesting that cytokine resistance of advanced stage melanoma cells may be relative. IL.-2- IL.-10 and IL.-12 displayed little or no effect on proliferation. The effect of cytokines on metalloproteinase production showed a cell line dependent pattern. Interestingly, those cytokines that exhibited the most pronounced antiproliferative activity, also proved most effective in stimulating collagenase secretion, often simultaneously, in the same line. The results indicate that pleiotropic cytokines can have positive and negative effects simultaneously on various steps of tumor progression.     

Effects of intralymphatic immunotherapy on natural killer activity in malignant melanoma patients

Adjuvant immunotherapy has the theoretical attraction of augmenting the host immune response at a time when the tumor burden is low. We have previously reported that intralymphatic immunotherapy (ILI) augments the cytolytic humoral immune responses in melanoma patients. This study was undertaken to assess the effects of ILI on cell-mediated immunity. As a model for the cellular effects of ILI, we investigated the natural killer (NK) cell activity in malignant melanoma patients. Fourteen patients were given an allogeneic cultured tumor cell vaccine (TCV) intralymphatically with concomitant administration of BCG. Natural killer cell activity was assessed sequentially using the single cell lysis and binding assay. Overall NK activity against the K562 target cell line showed a moderate increase over pretreatment levels as reflected by the increased number of target binding lymphocytes. However, the percentage of target binders mediating cell lysis remained unchanged during treatment. Assessment of NK activity against the NK-resistant M14 melanoma cell line reflected similar findings. These results suggest the activation of NK cells by tumor antigens, BCG, and/or alloimmunization with TCV. This increase appears to be manifested by increased target recognition rather than by alterations in effector cell function.