Volume-activated chloride channels contribute to cell-cycle-dependent regulation of HeLa cell migration

The activation of volume-activated chloride Cl⁻ channels has been implicated to play important roles in modulating cell cycle and cell migration. The aim of this study was to determine whether volume-activated Cl⁻ channels are involved in cell-cycle-dependent regulation of cell migration in HeLa cells. Using techniques including cell-cycle synchronization, transwell migration assays and the patch-clamp technique, we demonstrate in this study that both the expression of volume-activated chloride current (I_Cl,vol) and the potential of cell migration are cell-cycle-dependent; specifically, these events were high in G₀/G₁ phase, low in S phase, and medium in G₂/M phase. Moreover, the mean density of I_Cl,vol was positively correlated to the rate of cell migration during cell-cycle progression. Additionally, endogenous suppression of I_Cl,vol by transfecting cells with ClC-3 antisense oligonucleotides arrested cells in S phase and slowed cell migration. Collectively, our results suggest that volume-activated Cl⁻ channels contribute to the cell-cycle-dependent regulation of cell migration.     

ClC-3氯通道研究进展

容积敏感性氯通道普遍存在于哺乳动物细胞 ,对维持细胞容积平衡、调节细胞电活动等多种生理功能发挥重要作用。ClC 3作为可能编码ICl.swell的基因 ,受到广泛关注。本文就近年来对ClC 3氯通道在通道特点、生理作用及有关的通道调节机制等方面的研究进行了综述     

ClC-3氯通道对H_2O_2诱导的大鼠主动脉平滑肌细胞凋亡的影响

目的研究C lC-3氯通道蛋白过表达对H2O2诱导的大鼠主动脉平滑肌细胞凋亡的影响。方法蛋白免疫印迹法检测C lC-3蛋白表达;形态学方法、DNA琼脂糖电泳、MTT法和流式细胞仪观察和分析H2O2诱导的大鼠主动脉平滑肌细胞形态学改变、DNA断裂、细胞存活率、凋亡率及C lC-3蛋白过表达对其影响。结果C lC-3蛋白过表达减轻H2O2诱导的大鼠主动脉平滑肌细胞形态学改变、DNA断裂及细胞凋亡率,增加细胞存活。结论提示C lC-3氯通道蛋白过表达保护H2O2诱导的大鼠主动脉平滑肌细胞凋亡。     

反义ClC-3寡核苷酸促进thapsigargin诱导的PC12细胞凋亡

目的　研究反义ClC 3寡核苷酸对thapsigargin诱导的细胞凋亡的影响。方法　蛋白免疫印迹法检测ClC 3蛋白的表达 ;MTT法检测反义ClC 3寡核苷酸对TG诱导的细胞生长的影响 ;形态学方法、流式细胞仪和DNA琼脂糖凝胶电泳观察和分析PC12细胞在转染ClC 3反义寡核苷酸后 ,TG诱导的细胞形态、DNA含量的变化和DNA断裂的情况。结果　与对照组相比 ,反义ClC 3寡核苷酸呈浓度和时间依赖性地抑制ClC 3蛋白的表达 ;使TG诱导的PC12细胞存活率降低 ,凋亡程度加强 ,差异有显著性 ,而正义及随义ClC 3寡核苷酸对此没有影响。结论　反义ClC 3寡核苷酸对TG诱导的PC12细胞凋亡有促进作用。     

Ca~(2+)运动对α_1-肾上腺素受体引起内源性ClC-3氯通道表达的作用

目的　研究Ca2 +运动对α1 肾上腺素受体引起ClC 3氯通道表达的作用。方法　在A10细胞上 ,用RT PCR和Westernblot检测ClC 3mRNA和蛋白质表达情况。结果　苯肾上腺素 ( 10 μmol·L-1)和thapsigargin( 0 1μmol·L-1)可促进ClC 3mRNA和蛋白质的表达 ;SK&F963 65 ( 10 μmol·L-1)和genistein( 10 μmol·L-1)可抑制苯肾上腺素引起的ClC 3的表达 ,nifedipine( 10 μmol·L-1)无此作用。结论　在A10细胞上 ,通过钙池操纵性Ca2 +通道 (SOCC)的Ca2 +内流参与了α1 肾上腺素受体引起的内源性ClC 3氯通道的表达 ,而通过电压依赖性Ca2 +通道 (VDCC)的Ca2 +内流可能与此无关。蛋白酪氨酸激酶参与了ClC 3氯通道的表达     

氯离子通道ClC-3研究进展

ClC 3氯离子通道广泛分布于组织器官和各种细胞 ,ClC 3氯离子电流呈外向整合电流 ,在正性电位通道灭活 ,0mV左右出现反转电位 ,通道的离子渗透选择性是I->Cl-,能被氯通道阻断剂DIDS、tamoxifen和细胞外ATP抑制 ,被PKC磷酸化调节 ,参与细胞容积调控     

Cyclin D1和ClC-3在鼻咽癌细胞周期调控中的相互关系

目的 研究氯通道CIC-3和Cyclin D1在鼻咽癌细胞周期调控中的相互关系,探讨CIC-3参与细胞周期调控的可能机制.方法 MTT法检测CIC-3反义寡核苷酸对鼻咽癌细胞增殖能力的影响,流式细胞仪测定细胞周期分布.用反义技术分别抑制细胞内CIC-3和Cyclin D1的表达,用RT-PCR检测目的 基因的表达情况.结果 40μg/ml CIC-3反义寡核苷酸能明显抑制鼻咽癌细胞的增殖,胞内CIC-3的表达下调对Cyelin D1表达没有影响,而Cyclin D1的表达下调则抑制鼻咽癌细胞CIC-3的表达.结论 氯通道CIC-3参与了鼻咽癌细胞的周期调控,Cyclin D1可能位于该调控通路的上游.     

Cardiac-specific overexpression of the human short CLC-3 chloride channel isoform in mice

1. ClC-3 has been proposed as a molecular candidate responsible for volume-sensitive outwardly rectifying anion channels (VSOAC) in cardiac and smooth muscle cells. To further test this hypothesis, we produced a novel line of transgenic mice with cardiac-specific overexpression of the human short ClC-3 isoform (hsClC-3). 2. Northern and western blot analyses demonstrated that mRNA and protein levels of the short isoform (sClC-3) in the heart were significantly increased in hsClC-3-overexpressing (OE) mice compared with wild-type (WT) mice. Heart weight : bodyweight ratios for OE mice were significantly smaller compared with age-matched WT mice. 3. Electrocardiogram recordings indicated no difference at rest, whereas echocardiographic recordings revealed consistent reductions in left ventricular diastolic diameter, left ventricular posterior wall thickness at end of diastole and interventricular septum thickness in diastole in OE mice. 4. The VSOAC current densities in atrial cardiomyocytes were significantly increased by ClC-3 overexpression compared with WT cells. No differences in VSOAC current properties in OE and WT atrial myocytes were observed in terms of outward rectification, anion permeability (I(-) > Cl(-) > Asp(-)) and inhibition by 4,4'-diisothiocyanatostilbene-2,2'-disulphonic acid and glibenclamide. The VSOAC in atrial myocytes from both groups were totally abolished by phorbol-12,13-dibutyrate (a protein kinase C activator) and by intracellular dialysis of an N-terminal anti-ClC-3 antibody. 5. Cardiac cell volume measurements revealed a significant acceleration of the rate of regulatory volume decrease (RVD) in OE myocytes compared with WT. 6. In conclusion, enhanced VSOAC currents and acceleration of the time-course of RVD in atrial myocytes of OE mice is strong evidence supporting an essential role of sClC-3 in native VSOAC function in mouse atrial myocytes.     

The apoptotic effect of Zoledronic acid on the nasopharyngeal carcinoma cells via ROS mediated chloride channel activation

Zoledronic acid (ZA), a third‐generation bisphosphonate, has been applied for treatment of bone metastases caused by malignant tumors. Recent studies have found its anti‐cancer effects on various tumor cells. One of the mechanisms of anti‐cancer effects of ZA is induction of apoptosis. However, the mechanisms of ZA‐induced apoptosis in tumor cells have not been clarified clearly. In this study, we investigated the roles of chloride channels in ZA‐induced apoptosis in nasopharyngeal carcinoma CNE‐2Z cells. Apoptosis and chloride current were induced by ZA and suppressed by chloride channel blockers. After the knockdown of ClC‐3 expression by ClC‐3 siRNA, ZA‐induced chloride current and apoptosis were significantly suppressed, indicating that the chloride channel participated in ZA‐induced apoptosis may be ClC‐3. When reactive oxygen species (ROS) generation was inhibited by the antioxidant N‐acetyl‐L‐cysteine (L‐NAC), ZA‐induced apoptosis and chloride current were blocked accordingly, suggesting that ZA induces apoptosis through promoting ROS production and subsequently activating chloride channel.     

锚蛋白B在鼻咽癌组织中的表达及其对鼻咽癌细胞增殖、迁移和侵袭的影响

目的 探讨锚蛋白B(ANK2)基因在鼻咽癌组织中的表达及其对鼻咽癌细胞增殖、迁移及侵袭的影响.方法 选取2015年10月至2018年10月南阳市中心医院存档的鼻咽癌组织67例,实时荧光定量逆转录聚合酶链式反应(qRT-PCR)法检测人组织中ANK2 mRNA表达,以50例鼻咽部炎症组织作为对照组,分析鼻咽癌组织中ANK...     

内皮素-1对牛脑血管平滑肌细胞ClC-3通道表达的影响

目的　研究内皮素 1(ET 1)对牛脑血管平滑肌细胞(CSMC)内源性ClC 3表达的影响。方法　采用培养的CSMC ,用免疫印迹 (westernblot)方法分析CSMCClC 3通道表达。结果　①牛脑基底动脉、大脑中动脉、微动脉均有ClC 3蛋白表达 ,分子量约 10 5ku ,以微动脉表达最丰富 ,基底动脉表达最少 ;②培养的CSMC有内源性ClC 3蛋白表达 ,分子量约 95ku ;③ET 1能增加CSMCClC 3蛋白表达 ;④nifedipine、SK&F96 36 5能减少ET 1作用 ,环匹阿尼酸(cyclopiazonicacid ,CPA)浓度依赖性促进ClC 3蛋白表达 ,并能增强ET 1作用。结论　脑血管平滑肌细胞存在内源性ClC 3,ET 1可增强ClC 3表达 ,减少或增加胞浆内Ca2 + 浓度均可影响ET 1的作用     

微RNA-182-5p激动剂和抑制剂对肝癌细胞增殖和迁移的影响

目的研究微RNA(miR)-182-5p激动剂和抑制剂对肝癌细胞增殖和迁移的影响。方法采用实时荧光定量-聚合酶链反应(RT-qPCR)和蛋白质印迹法检测非肝细胞癌(HCC)肝组织,HCC组织及邻近组织标本中miR-182-5p的表达水平以及RND3的mRNA/蛋白表达水平。建立患者来源的HCC细胞培养物,并进行miR-182-5p激动剂和抑制剂转染处理,以分别模拟miRNA的过表达和敲减。通过Transwell细胞侵袭实验监测体外HCC细胞的迁移。通过细胞活力和增殖评价体外HCC细胞的生长。结果与非HCC或邻近的HCC组织相比,HCC组织中的miR-182-5p明显上调,与RND3 mRNA表达呈负相关。使用miR-182-5p激动剂可显著降低HCC细胞中RND3 mRNA/蛋白质表达水平。通过荧光素酶试验和顺乌头酸酶2(AGO2)-RNA免疫沉淀分析,验证了miR-182-5p对RND3 mRNA具有靶向作用。MiR-182-5p激动剂可显著降低RND3表达,促进HCC细胞体外迁移和侵袭,可能是通过Rho相关卷曲螺旋蛋白激酶1(ROCK1)和ROCK2的抑制来实现。结论miR-182-5p可以通过靶向RND3来提高体外HCC细胞的迁移和增殖。使用miR-182-5p抑制剂,可以抑制体外肝癌细胞的迁移和增殖。     

辛伐他汀抑制鼻咽癌细胞迁移

目的：研究辛伐他汀对鼻咽癌细胞株CNE2细胞迁移的作用。方法：用损伤修复实验和transwell实验观察辛伐他汀对鼻咽癌细胞株CNE2细胞迁移的抑制作用。结果：损伤修复实验结果显示,辛伐他汀浓度和时间依赖性地抑制鼻咽癌细胞株CNE2细胞迁移,2．5μmol／L的辛伐他汀作用24h,其迁移距离为对照组24h的50．1％。transwell实验结果表明2．5μmol／L的辛伐他汀处理24h,迁移细胞数量为对照组的69．2％。结论：辛伐他汀能浓度、时间依赖性地抑制CNE2细胞迁移。为辛伐他汀的临床研究提供有利的线索。     

体外定量测定肿瘤细胞迁移方法的建立及应用

目的建立一种可检测肿瘤细胞迁移率和筛选抗肿瘤细胞迁移药物的新方法。方法将TranswellTM小室迁移法与间接检测细胞数的MTT法相结合,分别定量迁移和未迁移细胞从而计算肿瘤细胞的迁移率。结果利用新方法,能检测6株不同肿瘤细胞的迁移能力;新方法重复性高于传统的计数法;并能测定药物对肿瘤细胞迁移的抑制作用。结论新建的肿瘤细胞迁移测定法是一种敏感和可靠的用于定量测定的肿瘤细胞迁移率的方法,为肿瘤细胞迁移的评估提供了更好的手段。     

心房颤动患者氯电流相关通道CIC-3基因表达的研究

目的:研究心房颤动(AF)患者心房组织氯电流相关通道ClC-3的基因表达,探讨AF时心房组织ClC-3的mRNA表达改变及其意义.方法:将71例风湿性心瓣膜病接受换瓣手术患者分为3组:窦性心律组(SR组)31例,阵发性房颤组(PAF组)7例,持续性房颤组(CAF组)33例,术中获取右心耳组织,应用半定量逆转录-聚合酶链反应(RT-PCR)技术检测心房组织ClC-3的mRNA表达的相对含量.结果:与SR组相比,PAF组心房组织中ClC-3的mRNA表达增加,但无显著的统计学意义(P>0.05),CAF组的表达明显增加(P＜0.01),并与AF时程呈明显正相关(r=0.376,P=0.001).结论:房颤患者ClC-3的mRNA表达水平的增加可能是细胞容量调节的氯电流(ICl.VOL)上调的分子基础.     

龙胆苦苷对大鼠血管平滑肌细胞增殖、迁移的影响

目的 观察龙胆苦苷对血管平滑肌细胞（vascular smooth muscle cells,VSMC）增殖、迁移能力的影响,并探讨其可能的作用机制。方法 体外分离培养大鼠血管平滑肌细胞,将血管平滑肌细胞随机分为分为control组、GPS处理组、PF-3758309+GPS组。采用噻唑蓝(MTT)法观察各组细胞增殖能力,计算细胞增殖抑制率;采用细胞划痕实验观察各组细胞迁移能力,计算细胞迁移率。采用Western blotting法检测各组细胞Pak4及MMP-2表达情况。结果 与对照组相比,龙胆苦苷处理组细胞增殖率及迁移率明显降低（P<0.01）,GPS组细胞内Pak4、MMP-2 表达水平明显降低（P<0.01）;而与GPS组相比,PF-3758309+GPS组可明显增加细胞增殖率及迁移率（P<0.05）,血管平滑肌细胞内 MMP-2 表达水平明显上调（P<0.05）。 结论 龙胆苦苷具有抑制血管平滑肌细胞增殖及迁移,其机制可能与抑制Pak4相关。     

阿司匹林对鼻咽癌CNE-1、5-8F细胞增殖、迁移与侵袭作用机制研究

目的 探讨阿司匹林对人鼻咽癌CNE-1、5-8F细胞增殖、迁移与侵袭的影响和机制。方法 将人鼻咽癌CNE-1、5-8F细胞株分为对照组和阿司匹林（0.00、1.25、2.50、5.00、10.00mmol/L）处理组。噻唑蓝（MTT）法检测不同浓度阿司匹林作用24、48、72h后对CNE-1、5-8F细胞的增殖能力,以半数抑制浓度（IC₅₀）作为后续实验药物处理浓度。集落形成实验检测CNE-1和5-8F细胞增殖能力,Transwell实验检测CNE-1和5-8F细胞迁移及侵袭能力的变化,Western blotting法检测CNE-1和5-8F细胞中蛋白激酶B（Akt）、磷脂酰肌醇3-激酶（PI3K）、波形蛋白（Vimentin）、E-钙黏蛋白（E-cadherin）、Snail蛋白相对表达水平。结果 人鼻咽癌CNE-1、5-8F细胞分别经1.25、2.50、5.00、10.00mmol/L阿司匹林处理后,细胞增殖均受到不同程度抑制,且呈时间及浓度相关性,IC₅₀分别为3.3、2.7mmol/L。与对照组相比,经阿司匹林处理后,鼻咽癌CNE-1、5-8F细胞的细胞增殖和集落形成能力明显下降（P＜0.01）。与对照组相比,经阿司匹林处理后,划痕愈合率显著降低（P＜0.05）。Trasnwell迁移实验结果表明,与对照组相比,阿司匹林处理组鼻咽癌细胞CNE-1和5-8F 48h穿过小室的数目显著减少（P＜0.05、0.001）。与对照组相比,阿司匹林处理组CNE-1、5-8F细胞的E-cadherin蛋白表达显著增加（P＜0.05）,PI3K、Akt、Vimentin、Snail蛋白表达显著下降（P＜0.05、0.01）。结论 阿司匹林可通过上调E-cadherin蛋白的表达、抑制上皮间质转化进程从而抑制人鼻咽癌CNE-1、5-8F细胞迁移侵袭,同时下调PI3K、Akt、Vimentin、Snail蛋白的表达进而抑制CNE-1、5-8F细胞增殖、迁移和侵袭能力。     

芍药苷对人上皮性卵巢癌HO8910细胞增殖、凋亡及迁移的影响及其机制研究

目的 观察芍药苷（Paeoniflorin,PF）对人上皮性卵巢癌HO8910细胞增殖、凋亡及迁移能力的影响,并探讨其可能的作用机制。方法 培养人上皮性卵巢癌HO8910细胞,随机分为对照组、芍药苷低剂量组、芍药苷中剂量组、芍药苷高剂量组。芍药苷低、中、高剂量组分别在加入0.5、1与2 mg·mL^-1芍药苷的DMEM培养液中培养48 h。采用四甲基偶氮唑蓝法（MTT）检测HO8910细胞增殖抑制率;TUNEL染色法检测细胞凋亡率;细胞划痕实验检测HO8910细胞迁移率;免疫蛋白印迹技术（Western blot）分析核因子-κB（NF-κB) p56、Bcl-2、caspase-3蛋白的表达。结果 与对照组相比,芍药苷对HO8910细胞增殖、迁移率有明显的抑制作用并促进其凋亡（P<0.05）,这种作用呈现剂量依赖性;芍药苷处理组细胞内caspase-3表达水平较对照组明显升高（P<0.05）,Bcl-2、核因子-κB p56表达水平较对照组明显降低（P<0.05）,且呈现剂量依赖性（P<0.05）。结论 芍药苷可明显抑制HO8910细胞的增殖,诱导其凋亡;其机制部分可能与阻断核因子-κB通路有关。     

Inhibiting calcium-activated chloride channel ANO1/TMEM16A suppresses migration of tumor epithelial cells

Uncontrolled cell migration is a common feature of tumor metastasis and formation. Understanding the molecular targetscritically involved in cell migration process can lead to the development of potentially novel therapeutic strategies for controlling invasion of tumor cells. In this study, we showed that calcium-activated chloride channel ANO1/TMEM16A played an important role in cell migration and inhibition of ANO1 channel function suppressed the migration of tumor epithelial cells. Silencing ANO1 by small hairpin RNA (shRNA) resulted in suppression of cell migration and invasiveness in cancer cell lines. In addition, pharmacological inhibition of ANO1 by the channel specific inhibitor T16Ain-A01 significantly slowed down the migration andinvasion of tumor epithelial cells in a dose-dependent manner. Taken together, our findings have demonstrated that calcium-activated chloride channel ANO1 contributes to cell migration, and specific ANO1/TMEM16A inhibitors can be the promising candidate to develop new therapies for cancer metastasis.     

川芎嗪联合mTOR抑制剂调控卵巢癌SKOV-3细胞增殖、侵袭迁移的实验研究

目的 研究川芎嗪联合mTOR抑制剂对卵巢癌SKOV-3细胞增殖、侵袭迁移的作用.方法 分别设置对照组、40μmol/L川芎嗪组、5μmol/L雷帕霉素组、40μmol/L川芎嗪联合5μmol/L雷帕霉素组,各组SKOV-3细胞给药后继续培养48 h后,MTT法考察各组SKOV-3细胞的增殖抑制率,Transwell实验...