羟苯氨酮激活家兔血管平滑肌细胞钙敏感钾通道

目的研究羟苯氨酮(oxyphenamone,Oxy)扩张血管作用机理。方法用全细胞膜片钳技术,监测家兔肠系膜阻力血管平滑肌细胞钙敏感钾通道电流变化以及Oxy对其的影响。结果0.1 μmol·L^-1 Oxy明显增加钙敏感钾通道电流,冲洗后恢复至给药前水平;0.01～10 μmol·L^-1 Oxy明显增加钙敏感钾通道电流,且呈现浓度依赖性。结论 Oxy呈浓度依赖性和可逆性的增大血管平滑肌细胞钙敏感钾通道电流。     

Increase in force of contraction by activation of the Na+'ox/Ca2+'ox-exchangerin human myocardium

Aims The aim of the present study was to investigate whether agents which enhance force of contraction via increasing intracellular Na⁺, i.e. cAMP-independently, remain effective in failing human myocardium.Methods Cumulative concentration-response curves with (±)BDF 9148 (0.01–10 μmol l⁻¹ ), a Na⁺-channel activator, and ouabain (0.01–0.1 μmol l⁻¹ ), a Na⁺/K⁺-ATPase inhibitor, were performed on electrically driven left ventricular human papillary muscle strips (1 Hz, 37° C; dilative cardiomyopathy, NYHA IV, heart transplantation, n=16; nonfailing, donor hearts, n=5). The β-adrenoceptor agonist isoprenaline (0.001–1 μmol l⁻¹ ) and Ca²⁺ (1.8–15 mmol l⁻¹ ) were studied for control. In addition, Ca²⁺ response curves were obtained on skinned fibre preparations from left ventricular myocardium (NYHA IV, n=7) in the presence of BDF 9148 (1 μmol l⁻¹ ) or a high Na⁺ concentration (50 mmol l⁻¹ ) to investigate a possible direct or indirect interaction of (±)BDF 9148 with the myofilaments.Results While isoprenaline was significantly less effective in increasing force of contraction in failing human myocardium than in nonfailing myocardium (P<0.01), in NYHA IV, (±)BDF 9148 and ouabain were as effective as in nonfailing human tissue. In failing and nonfailing myocardium, (±)BDF 9148 and ouabain exerted positive inotropic effects similar to those of Ca²⁺. However, the potency for (±)BDF 9148 to increase force of contraction was higher in NYHA IV than in nonfailing human myocardium (P<0.05). Neither (±)BDF 9148 (1 μmol l⁻¹ ) nor an increased concentration of Na⁺ (50 mmol l⁻¹ ) altered the Ca²⁺ sensitivity or maximal developed tension of the contractile apparatus in experiments on chemically skinned left ventricular fibres.Conclusions The enhanced sensitivity of the failing human myocardium towards Na⁺-channel modulation is not due to a direct or indirect interaction of (±)BDF 9148 with cardiac myofilaments but may be due to an altered Na⁺-homeostasis in human heart failure.     

胰岛素对人乳腺癌细胞株MDA-MB-543生长的增殖作用

目的探讨胰岛素对人乳腺癌细胞株MDA-MB-543生长的增殖作用。方法将胰岛素直接作用于体外培养的人乳腺癌细胞株(MDA-MB-543),采用四甲基偶氮唑盐(MTT)法检测细胞增殖,流式细胞仪测定细胞周期分布。结果胰岛素在1～10 mU/mL浓度范围内和作用时间2～16 h范围内,对MDA-MB-543增殖作用逐步增强,反映增殖活性的S期和G2/M期细胞比例逐渐增多,其中S期细胞比例与对照组比较有显著性差异(均P<0.05或0.01)。结论胰岛素能加快诱导MDA-MB-543细胞进入细胞周期S期增殖,呈剂量和时间依赖关系,但是短暂和可逆的。     

大黄素对人胃癌MNK-45和MGC8-03细胞增殖的影响

目的 观察大黄素对人胃癌MNK-45和MGC8-03细胞增殖的影响。方法 采用MTT法测定MNK-45细胞和MGC8-03细胞增殖抑制率;采用AO/EB双染观察细胞形态学变化;采用流式细胞仪测定细胞周期。结果 大黄素（5～80 μg/mL）对MNK-45和MGC8-03细胞增殖均具有显著抑制作用。P＜0.01或0.05）,且药物剂量越大,作用时间越长,其抑制作用越强（P＜0.01）;大黄素作用于两种细胞后荧光显微镜下观察均显示细胞凋亡特征;大黄素使MNK-45和MGC8-03细胞增殖被阻滞于G₀/G₁期。结论 大黄素能抑制人胃癌MNK-45和MGC8-03细胞增殖,诱导其凋亡,影响其细胞周期时相的分布。     

Purinergic regulation of the epithelial Na+ channel

1. The epithelial Na⁺ channel (ENaC) is a major conductive pathway that transports Na⁺ across the apical membrane of the distal nephron, the respiratory tract, the distal colon and the ducts of exocrine glands. The ENaC is regulated by hormonal and humoral factors, including extracellular nucleotides that are available from the epithelial cells themselves.
2. Extracellular nucleotides, via the P2Y2 receptors (P2Y2Rs) at the basolateral and apical membrane of the epithelia, trigger signalling systems that inhibit the activity of the ENaC and activate Ca²⁺ -dependent Cl⁻ secretion.
3. Recent data from our laboratory suggest that stimulation of the P2Y2Rs at the basolateral membrane inhibits ENaC activity by a signalling mechanism that involves Gβγ subunits freed from a pertussis toxin (PTX)-sensitive G-protein and phospholipase C (PLC) β4. A similar signalling mechanism is also partially responsible for inhibition of the ENaC during activation of apical P2Y2Rs.
4. Stimulation of apical P2Y2Rs also activates an additional signalling mechanism that inhibits the ENaC and involves the activated Gα subunit of a PTX-insensitive G-protein and activation of an unidentified PLC. The effect of this PTX-insensitive system requires the activity of the basolateral Na⁺/K⁺/2Cl⁻ cotransporter.     

全反式维甲酸对人胃癌细胞株增殖的影响

研究全反式维甲酸对三株分化程度不同的人胃癌细胞增殖的影响，发现该药对人胃癌细胞株（ＭＫＮ－２８，ＳＧＣ－７９０１）的体外增殖和裸鼠体内移植瘤的生长都有选择性抑制作用，并有不影响细胞活力的特点。而对低分化癌细胞株则无明显作用。进一步研究发现全反式维甲酸可使敏感的胃癌细胞株的３Ｈ－ＴｄＲ掺入值降低，胃癌细胞大多积滞于Ｇ１／Ｇ０期，而Ｇ２／Ｍ期细胞比例相应下降，提示该药对胃癌细胞的ＤＮＡ合成和增殖周期有影响。     

Involvement of the p38 MAPK signaling pathway in S‐phase cell‐cycle arrest induced by Furazolidone in human hepatoma G2 cells

Given the previously described essential role for the p38 mitogen‐activation protein kinase (p38 MAPK) signaling pathway in human hepatoma G2 cells (HepG2), we undertook the present study to investigate the role of the p38 MAPK signaling pathway in cell‐cycle arrest induced by Furazolidone (FZD). The aim of this study was to determine the effects of FZD on HepG2 cells by activating and inhibiting the p38 MAPK signaling pathway. The cell cycle and proliferation of HepG2 cells treated with FZD were detected by flow cytometry and MTT assay in the presence or absence of p38 MAPK inhibitors (SB203580), respectively. Cyclin D1, cyclin D3 and CDK6 were detected by quantitative real‐time PCR and western blot analysis. Our data showed that p38 MAPK became phosphorylated after stimulation with FZD. Activation of p38 MAPK could arise S‐phase cell‐cycle arrest and suppress cell proliferation. Simultaneously, inhibition of the p38 MAPK signaling pathway significantly prevented S‐phase cell‐cycle arrest, increased the percentage of cell viability and decreased the expression of cyclin D1, cyclin D3 and CDK6. These results demonstrated that FZD arose S‐phase cell‐cycle arrest via activating the p38 MAPK signaling pathway in HepG2 cells. Cyclin D1, cyclin D3 and CDK6 are target genes functioning at the downstream of p38 MAPK in HepG2 cells induced by FZD. Copyright © 2012 John Wiley & Sons, Ltd.     

马尾松花粉硫酸酯化多糖对大鼠主动脉平滑肌细胞 [Ca2+]i调控及增殖的影响

目的 研究马尾松花粉多糖PPM60-A及其硫酸酯化物SPPM60-A对大鼠动脉平滑肌细胞 [Ca²⁺]_i调控及增殖的影响。方法 常规水提醇沉法制备马尾松花粉多糖,Sephacryl S-400HR色谱分离得PPM60-A,氯磺酸-吡啶法得硫酸酯化物SPPM60-A,酯化度为1.28。酶解法分离制备大鼠动脉平滑肌细胞,测定酯化前后多糖对其胞内 [Ca²⁺]_i和细胞增殖的影响。结果 PPM60-A和SPPM60-A均可以降低 [Ca²⁺]_i,抑制高K⁺和去甲肾上腺素（NE）诱导的钙离子升高,降低高K⁺引起的钙离子水平上升,对NE诱导的血管主动脉平滑肌细胞增殖具有显著的抑制作用。PPM60-A作用效果好于SPPM60-A。结论 PPM60-A及SPPM60-A均能抑制细胞外Ca²⁺内流,抑制血管平滑肌细胞增殖。     

大黄素对人胃癌MNK-45和MGC8-03细胞增殖的影响

目的观察大黄素对人胃癌MNK-45和MGC8-03细胞增殖的影响。方法采用MTT法测定MNK-45细胞和MGC8-03细胞增殖抑制率;采用AO/EB双染观察细胞形态学变化;采用流式细胞仪测定细胞周期。结果大黄素（5～80μg/mL）对MNK-45和MGC8-03细胞增殖均具有显著抑制作用（P〈0.01或0.05）,且药物剂量越大,作用时间越长,其抑制作用越强（P〈0.01）;大黄素作用于两种细胞后荧光显微镜下观察均显示细胞凋亡特征;大黄素使MNK-45和MGC8-03细胞增殖被阻滞于G0/G1期。结论大黄素能抑制人胃癌MNK-45和MGC8-03细胞增殖,诱导其凋亡,影响其细胞周期时相的分布。     

PDGF-BB和CTGF在体外对人皮肤成纤维细胞增殖的影响

目的探讨重组人血小板衍生生长因子（rhPDGF-BB）和重组人结缔组织生长因子（rhCTGF）单独或联合应用对体外培养的人皮肤成纤维细胞（human skin fibroblast,HSF）增殖的影响,为寻求快速扩增HSF的方法提供参考依据。方法取手术中切除的正常皮肤,以常规组织块法体外获得皮肤成纤维细胞。取生长良好的第4~7代细胞种入96孔板,分实验组和对照组,分别加入不同浓度的rhPDGF-BB、rhCTGF或rhPDGF-BB＋rhCTGF作用。于第1、3、6、9d采用四唑盐（MTT）法分别测定各组吸光度A值,观察上述两种生长因子对细胞的增殖作用。结果 rhPDGF-BB能明显促进体外培养的HSF增殖,在1~9d,0.1ng/ml~100ng/ml范围内呈浓度时间依赖关系。rhCTGF也能明显促进HSF增殖,除第1d最大效应浓度为50ng/ml,其余时间点在10ng/ml~100ng/ml范围内呈浓度时间依赖关系。而rhCTGF150ng/ml组的增殖效果相对100ng/ml组略成下降趋势。rhPDGF-BB与rhCTGF最大与最小效应联用组亦成浓度时间依赖关系。最大效应联用组的增殖效果与以上两种生长因子单独应用比较均具有统计学意义（P〈0.05）。最小效应联用组与rhCTGF10ng/ml组比较有统计学意义（P〈0.05）,而与rhPDGF-BB0.1ng/ml组比较无统计学意义（P〉0.05）。另外,最大效应浓度的两生长因子单独应用时,rhPDGF-BB促增殖效果优于rhCTGF（P〈0.05）。结论 rh-PDGF-BB和rhCTGF均可促进体外培养的HSF增殖,在一定范围内呈浓度时间依赖关系,而且前者优于后者。两者联合应用对HSF增殖具有协同效应。     

建立人肝微粒体-小鼠3T3成纤维细胞模型评价5-羟基雷公藤内酯醇代谢产物的细胞毒性

目的：以环磷酰胺（cyclophosphamide,CPA）和他莫昔芬（tamoxifen,TMX）为模型药物,建立人肝微粒体-小鼠3T3成纤维细胞模型,并用该模型评价5-羟基雷公藤内酯醇（T8）代谢产物的细胞毒性。方法：采用人肝微粒体（加或不加NADPH）-小鼠3T3成纤维细胞模型,测定吸光度（A值）并计算细胞孵育液的EC50值和EC50 shift,以EC50 shift评价代谢产物毒性。结果：模型药物CPA和TMX及创新药物T8的EC50 shift分别为0.34、〉4.7和1.2,表明CPA和TMX的代谢物会分别增加和降低细胞毒性,而T8代谢产物不影响或稍许降低对细胞的毒性。结论：本实验成功建立人肝微粒体-小鼠3T3成纤维细胞模型,这为T8进入体内的安全性提供了一定依据,也为候选化合物开发初期在不合成代谢物的情况下初步评价代谢物的细胞毒性提供了一种体外方法。     

A comparison of the effects of aspirin on bleeding time measured using the Simplate™ method and closure time measured using the PFA-100™, in healthy volunteers

Aims The aim of this study was to compare the effects of aspirin on platelet function as measured by the ‘classical’ template bleeding time with a new ex vivo method measuring closure times using the PFA-100^™ machine. Platelet aggregation in response to arachidonic acid was also measured ex vivo. Methods The trial was a randomized, double-blind, placebo-controlled crossover design, with each volunteer taking 750 mg aspirin (BP) or placebo, three times a day for 5 days, with an 18 day wash-out period between treatments. Bleeding times and closure times were measured before the first dose on the first day and 0.5 h after the last dose on the fifth day of each treatment period. They were also measured 2 weeks after the last day of the trial. Results Baseline bleeding times (pre-placebo) were 415 s using the Simplate, whilst baseline closure times were 115 s using the PFA-100^™. Aspirin treatment caused an increase of both the template bleeding time (61%) and the closure time of the PFA-100^™ (79%) when compared with the effects of placebo. The platelet aggregatory response to arachidonic acid was completely inhibited following aspirin treatment and was unaffected following placebo. Two weeks after the end of the trial, all values had returned to pre-treatment levels. The template bleeding time was unaltered in 1 of the 12 volunteers during aspirin treatment and was significantly prolonged in 3 of the 12 volunteers during placebo treatment. The PFA-100^™ closure time was unaltered in 1 of the 12 volunteers during aspirin treatment and was prolonged in 1 subject during placebo treatment. Conclusions The change in closure time using the PFA-100^™ is as sensitive and reproducible to the effects of aspirin on platelet function as is the template bleeding time test. However, the PFA-100^™ produced less variable effects with fewer false positive results.     

HPLC-DAD法测定脑血栓片中苦杏仁苷、羟基红花黄色素A、芍药苷、阿魏酸、丹酚酸B和丹参酮ⅡA

目的建立测定脑血栓片中苦杏仁苷、羟基红花黄色素A、芍药苷、阿魏酸、丹酚酸B和丹参酮ⅡA的HPLC-DAD法。方法采用HPLC-DAD法,Agilent Poroshell 120 SB-C18色谱柱(100 mm×4.6 mm,2.7μm);流动相:甲醇–0.2%磷酸溶液,梯度洗脱;检测波长分别为210 nm(苦杏仁苷)、403 nm(羟基红花黄色素A)、230 nm(芍药苷)、321 nm(阿魏酸)、286 nm(丹酚酸B)、270 nm(丹参酮ⅡA);体积流量:0.7 m L/min;柱温:30℃;进样量3~5μL。结果苦杏仁苷、羟基红花黄色素A、芍药苷、阿魏酸、丹酚酸B和丹参酮ⅡA 6个成分的线性范围分别为11.90~1 158.90、9.14~91.39、11.70~1 173.50、4.04~1 011.00、3.97~992.20、4.40~551.00 ng;平均回收率分别为96.47%、96.92%、99.96%、97.20%、97.57%、96.50%,RSD值分别为1.3%、1.6%、1.3%、1.7%、1.9%、0.7%。结论所建立的方法可同时测定脑血栓片中苦杏仁苷、羟基红花黄色素A、芍药苷、阿魏酸、丹酚酸B和丹参酮ⅡA。     

冬虫夏草对离体人肾小球系膜增殖的影响

目的 :观察冬虫夏草对离体人肾小球系膜增殖的疗效 ,并探讨其机制。方法 :利用体外培养的人肾小球系膜细胞 ,采用检测 3H胸腺嘧啶掺入量的方法 ,研究北冬虫夏草和天然冬虫夏草对低密度脂蛋白 (L DL )引起系膜细胞增殖的影响。结果 :2组冬虫夏草组的 3H掺入率均明显低于 L DL对照组 (P<0 .0 1) ,而 2组冬虫夏草之间同一浓度相比无显著性差异 (P>0 .0 5 )。结论 :冬虫夏草明显抑制 L DL引起的系膜细胞增殖 ,北冬虫夏草与天然冬虫夏草作用相似。其机制可能是由于冬虫夏草间接抑制了系膜细胞增殖过程中 DNA的合成。     

重组人血管内皮抑制素联合顺铂对人骨肉瘤MG-63细胞VEGF基因表达、增殖及侵袭力的影响

目的 观察重组人血管内皮抑制素(rhEndo)联合顺铂对人骨肉瘤MG-63细胞VEGF基因表达、增殖及侵袭力的影响.方法 顺铂、rhEndo、rhEndo联合顺铂分别处理MG-63细胞,采用RT-PCR和Western blot检测细胞VEGF mRNA和蛋白表达量,CCK-8实验检测细胞增殖,流式细胞术检测细胞凋亡,Transwell小室体外迁移实验检测细胞侵袭和迁移能力.结果 rhEndo联合顺铂组对VEGF mRNA和蛋白表达量、细胞增殖、侵袭迁移的抑制作用以及对细胞凋亡的促进作用均显著高于rhEndo、顺铂单药组,差异有统计学意义(P＜0.05).结论 重组人血管内皮抑制素联合顺铂能够在抑制骨肉瘤MG-63细胞VEGF表达、细胞增殖和侵袭力、促进细胞凋亡方面发挥协同作用.     

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.     

Kv通道亚型在15-HETE收缩肺动脉过程中的作用

目的从组织功能及细胞分子水平研究电压门控型钾通道(Kv通道)亚型在15-羟化二十碳四烯酸(15-HETE)致大鼠肺动脉收缩过程中的作用。方法采用组织浴槽血管环法，使用Kv通道阻断剂，确定受15-HETE调控大鼠肺动脉平滑肌细胞(PASMCs)膜上Kv亚型；使用RT-PCR和Western blotting技术观察受15-HETE调控PASMCs 膜上Kv亚型。结果阻断Kv1.1，Kv1.2，Kv1.3和Kv1.6通道并不影响15-HETE诱导肺动脉血管收缩；15-HETE不影响PASMCs膜上Kv1.1和Kv1.2通道蛋白质表达；15-HETE下调PASMCs膜上Kv1.5和Kv2.1通道mRNA和蛋白质表达。结论缺氧可能是通过15-HETE这一介导因子抑制Kv1.5和Kv2.1通道，减少PASMCs膜上功能性Kv1.5和Kv2.1通道数量，导致PASMCs收缩。     

人类后肠及肛门直肠胚胎发育中凋亡及细胞增殖的时空分布研究

目的：揭示肛门直肠的胚胎发育过程,初步探讨细胞增殖／凋亡在肛门直肠胚胎发育中的作用。方法本研究应用3～9周人胚标本,通过HE染色后连续动态观察肛门直肠的形态变化过程并结合TUNEL及PCNA免疫组织化学染色分析细胞增殖／凋亡的时空分布规律。结果第6周,凋亡细胞主要位于肛门直肠、尿直肠隔及尿生殖窦的上皮;尤其是在肛门开口区周围分布着大量凋亡细胞;第7周,凋亡细胞大量分布于直肠末端和直肠背侧间质区;第8周,直肠及肛管上皮中可以见到凋亡细胞,而在尿直肠隔背侧与泄殖腔膜内仅观察到少量的凋亡细胞。第6周,肛门直肠、尿生殖窦及尿直肠隔上可以观察到微弱的增殖细胞;散在的增殖细胞位于背侧泄殖腔膜;第7周,尿直肠隔间质中可见增殖细胞出现,这些细胞大部分位于肛门直肠和尿直肠隔腹侧的间质内;第8周,增殖细胞主要分布于尿道和肛门直肠的上皮中,同时在尿直肠隔与腹侧泄殖腔膜和融合区域内有大量增殖细胞聚集。结论在人类胚胎发育过程中,尿直肠隔与背侧泄殖腔膜并未发生融合,背侧泄殖腔膜和背侧泄殖腔在肛门直肠发育过程中发挥了重要作用;肛门开口后,尿直肠隔继续向头腹侧移位,与腹侧泄殖腔膜融合,腹侧泄殖腔膜在泌尿生殖道和会阴的胚胎发育中具有重要的意义。细胞凋亡促进了肛膜的崩解,使得肛门直肠与羊膜腔相通,在人类肛门直肠的胚胎发育过程中有重要的意义;胎龄第6～8周尿直肠隔,腹侧泄殖腔膜发生的细胞增殖和凋亡促进了尿生殖膈的头腹侧移位,在尿直肠隔与腹侧泄殖腔膜融合过程中发挥了重要的作用。     

Role of connexin 43 in cadmium‐induced proliferation of human prostate epithelial cells

Connexins (Cxs), the subunits of gap junction channels, are involved in many physiological processes. Aberrant control of Cxs and gap junction intercellular communication may contribute to many diseases, including the promotion of cancer. Cd exposure is associated with increased risk of human prostate cancer and benign prostatic hyperplasia. The roles of Cxs in the effects of Cd on the prostate have, however, not been reported previously. In this study, the human prostate epithelial cell line RWPE‐1 was exposed to Cd. A low dose of Cd stimulated cell proliferation along with a lower degree of gap junction intercellular communication and an elevated level of the protein Cx43. Cd exposure increased the levels of intracellular Ca²⁺ and phosphorylated Cx43 at the Ser368 site. Knockdown of Cx43 using siRNA blocked Cd‐induced proliferation and interfered with the Cd‐induced changes in the protein levels of cyclin D1, cyclin B1, p27^Kip1 (p27) and p21^Waf1/Cip1 (p21). The increase in Cx43 expression induced by Cd was presumably mediated by the androgen receptor, because it was abolished upon treatment with the androgen receptor antagonist, flutamide. Thus, a low dose of Cd promotes cell proliferation in RWPE‐1, possibly mediated by Cx43 expression through an effect on cell cycle‐associated proteins. Cx43 might be a target for prostatic diseases associated with Cd exposure. Copyright © 2017 John Wiley & Sons, Ltd.     

PI3K/Akt抑制剂CCT128930抑制人脐静脉血管内皮细胞增殖与血管生成的实验研究

目的探讨一类新的PI3K/Akt抑制剂CCT128930对人脐静脉血管内皮细胞(HUVEC)增殖与血管生成的影响。方法采用MTT法检测CCT128930对HUVEC存活的影响;流式细胞术分析细胞周期变化;AnnexinⅤ-FITC试剂盒检测细胞凋亡;体外小管形成实验观察CCT128930对HUVEC体外小管形成的影响;免疫印迹法检测蛋白表达水平。结果CCT128930可通过阻滞细胞于G1期而抑制HUVEC的增殖,且抑制作用呈剂量依赖性,但对HUVEC的凋亡无影响;HUVEC经CCT128930处理后,体外小管形成能力受到明显抑制;低浓度的CCT128930抑制内皮细胞中VEGF的表达,但对Akt的磷酸化水平无影响。结论 CCT128930能够抑制HUVEC的增殖与血管生成,其抑制血管生成活性可能与其调控VEGF的表达水平相关。