二十二碳六烯酸对胰腺癌细胞增殖和凋亡的影响

目的 观察二十二碳六烯酸(DHA)对人胰腺癌细胞株生长的抑制作用.方法 将DHA与胰腺癌细胞混合培养,采用MTT、流式细胞技术分析细胞增殖、细胞凋亡、细胞周期以及凋亡相关蛋白Bcl-2含量.结果 50μg/ml DHA作用人胰腺癌细胞株后,Patu8988、SW1990增殖率24 h为(46.89±5.99)、(46.03±7.69),48 h为(35.92±2.91)、(25.70±5.60),肿瘤细胞增殖受到明显抑制(P<0.01).同时细胞凋亡率明显升高,效应呈现时间-剂量依赖关系,72 h后Patu8988、SW1990凋亡率分别为53.2%、13.7.G0～G1期细胞比例增高,S期细胞比例下降.DHA作用24 h后,Patu8988、SW1990 Bcl-2蛋白表达率明显低于对照组(P<0.05).结论 DHA能抑制胰腺癌细胞增殖,并通过下调Bcl-2在细胞中表达来诱导胰腺癌细胞凋亡.     

Anti-miR-155反义寡核苷酸对胰腺癌SW1990细胞株增殖和凋亡的影响

目的 观察anti-miR-155反义寡核苷酸(AMOs)对人胰腺癌细胞株SW1990增殖和凋亡的影响.方法 将SW1990细胞分为空白组、阴性对照组和AMOs处理组.阴性对照组将阴性对照链转染入SW1990细胞株中,AMOs处理组采用AMOs抑制SW1990细胞内miR-155的活性;CCK-8法测定细胞增殖抑制率,流式细胞术测定细胞周期及凋亡.结果 与空白组及阴性对照组相比,AMOs显著抑制SW1990细胞的增殖(P＜0.05),100 nmol/L AMOs的抑制率达36.51％,使G0/G1细胞比例显著增加,G2/M期细胞比例显著减少(P＜0.05),AMOs处理过的SW1990细胞早期凋亡率明显增高(P＜0.05).结论 AMOs通过抑制SW1990细胞内高水平表达miR-155的活性,显著抑制SW1990细胞的增殖.     

硫利达嗪对胰腺癌细胞增殖及凋亡的影响及机制探讨

目的 探讨硫利达嗪（TDZ）对胰腺癌细胞SW1990增殖、凋亡的影响及其对LINC00470的调控作用。方法 用不同浓度（5、10、20μmol/L）的TDZ处理人胰腺癌细胞SW1990,si-NC(si-NC组)、si-LINC00470(siLINC00470组)转染至SW1990细胞，分别将pcDNA(TDZ+pcDNA组)、pcDNA-LINC00470(TDZ+pcDNA-LINC00470组)转染至SW1990细胞后加入TDZ处理细胞；MTT、平板克隆形成实验检测细胞增殖及克隆形成能力；流式细胞术检测细胞凋亡率；实时荧光定量PCR检测LINC00470的表达量；Western blot检测活化的胱天蛋白酶（cleavedcaspase）3、cleaved-caspase9蛋白表达。结果 与对照组比较，TDZ不同剂量组SW1990细胞增殖抑制率、凋亡率和cleaved-caspase3、cleaved-caspase9蛋白水平升高，细胞克隆形成数减少，LINC00470的表达量降低（P<0.05）。与si-NC组比较，si-LINC00470组SW1990细胞增殖抑制率...     

NF-κB在大黄素增强胰腺癌吉西他滨化疗敏感性中的作用

为探讨大黄素增强胰腺癌吉西他滨化疗敏感性的作用及其机制,本研究诱导建立耐100 nmol·L-1吉西他滨的人胰腺癌SW1990细胞株(SW1990/GZ),在体外实验中,应用CCK-8法检测细胞增殖活性;流式细胞术检测细胞凋亡;凝胶电泳迁移率实验(EMSA)检测细胞中NF-κB活性;Western blotting检测细胞中蛋白表达水平;在体内实验中,建立裸鼠胰腺癌原位移植模型;免疫组织化学法检测肿瘤组织中蛋白表达。结果表明,大黄素预处理可显著增强吉西他滨对胰腺癌细胞的生长抑制和诱导凋亡作用;大黄素联合吉西他滨可显著抑制胰腺癌原位移植瘤生长;大黄素还可下调体内外胰腺癌中NF-κB及其调控蛋白Bcl-2和Survivin的表达。提示NF-κB在大黄素增敏胰腺癌吉西他滨化疗中具有重要意义。     

普伐他汀对人胰腺癌细胞SW1990增殖和凋亡的影响及其机制研究

目的　探讨普伐他汀（Pravastatin）对人胰腺癌细胞SW1990 增殖和凋亡的影响及其可能机制。方法　体外培养人胰腺癌细胞SW1990,给予不同浓度（0,5,10,20 μmol/L）普伐他汀处理,采用四甲基偶氮唑蓝（MTT）比色法检测细胞增殖情况,流式细胞术测定细胞凋亡情况及p21Ras、Bcl-2、Bax 蛋白表达,RT-PCR 法检测Bcl-2、Bax mRNA 水平。结果　普伐他汀处理SW1990 细胞后,细胞增殖受抑而凋亡增加,p21Ras、Bcl-2 的蛋白表达降低而Bax 的表达增高,Bcl-2 mRNA 水平降低而Bax mRNA 水平增高。结论　普伐他汀可抑制胰腺癌细胞SW1990 增殖并诱导其凋亡,其诱导凋亡机制可能是下调p21Ras、Bcl-2 的表达和上调Bax 的表达。     

干扰c-myc基因表达增强人胰腺癌细胞对吉西他滨和卡铂的敏感性

目的　探讨干扰c-myc 基因表达对人胰腺癌细胞SW1990 对化疗药物敏感性的影响。方法　采用实时定量PCR和Western blot 检测人胰腺癌细胞系SW1990 中c-myc 基因的干扰效果;MTT 法检测癌细胞对化疗药物吉西他滨和卡铂的敏感性;流式细胞术检测吉西他滨诱导的细胞凋亡情况。结果　c-myc siRNA 显著下调人胰腺癌SW1990 细胞中c-myc 基因的mRNA 和蛋白表达水平。干扰c-myc 表达后,化疗药物吉西他滨和卡铂对SW1990 细胞的半数抑制浓度（IC50）均显著减小（P<0.05）,吉西他滨诱导的SW1990 细胞凋亡率显著升高（P<0.05）。结论　干扰c-myc 表达可增强人胰腺癌细胞株SW1990 对化疗药物吉西他滨和卡铂的敏感性。     

齐留通对胰腺癌细胞增殖与凋亡的影响

[摘要]目的 探讨齐留通阻断5-脂氧合酶（5-LOX）代谢途径对胰腺癌细胞增殖和凋亡的影响。方法 将胰腺癌细胞SW1990与不同浓度齐留通（浓度分别为40，30，20，10，5，3和1 μg·mL-1）共同孵育,以不加齐留通的细胞为对照组。采用MTT法检测作用不同时间后齐留通对SW1990细胞的抑制率；倒置显微镜观察齐留通浓度为20 μg·mL-1时细胞形态变化；将SW1990胰腺癌细胞与不同浓度齐留通（浓度分别为80，40，20，10和5 μg·mL-1）作用24 h，对照组加入等量培养基和溶媒，流式细胞仪(FCM)AnnexinⅤ/PI双染法检测各组SW1990细胞增殖指数， FCM检测细胞周期。结果 培养48 h后，40和30 μg·mL-1齐留通组对胰腺癌SW1990细胞增殖的抑制作用明显强于对照组，且均差异有极显著性（均P<0.01）；培养72 h后，40，30和20 μg·mL-1齐留通组对胰腺癌细胞的抑制较对照组显著增强（均P<0.01）。其他检测结果亦表明，齐留通可抑制SW1990细胞增殖，促进细胞凋亡，该作用呈浓度和时间依赖性。与对照组相比, 20 μg·mL-1齐留通作用18 h后G0/G1期细胞所占比例较对照组明显增高（P<0.01）,G2/M期、S期细胞所占比例降低。结论 齐留通能抑制胰腺癌细胞增殖并诱导细胞凋亡，使细胞DNA合成受抑制,产生G1期阻滞。     

核糖核酸干扰下调ACE蛋白表达对胰腺癌细胞运动侵袭能力的影响

目的观察血管紧张素转换酶(ACE)下调对胰腺癌细胞株SW1990运动侵袭能力的影响。方法设计并体外合成靶向ACE的小干扰RNA,将其转染到SW1990细胞中,蛋白质印迹法检测转染前后细胞中ACE蛋白的表达,采用Transwell小室检测转染前后细胞运动侵袭能力的改变。结果 ACE siRNA能有效降低SW1990细胞中ACE的表达。抑制SW1990细胞中ACE的表达后,SW1990细胞的运动能力明显下降,穿过人工基底膜的细胞数显著低于对照组(P<0.05)。结论核糖核酸干扰下调ACE表达能明显抑制胰腺癌细胞SW1990在体外的运动侵袭能力。     

吉西他滨联合大黄素对胰腺癌 SW1990细胞多耐药基因?1、 miRNA?1271及上皮-间充质细胞转化的影响

目的探究吉西他滨联合大黄素对胰腺癌 SW1990细胞生长的抑制作用及对多耐药基因 ?1(MDR?1)、 miRNA?1271和上皮-间充质细胞转化( EMT)的影响。方法将胰腺癌 SW1990细胞分为大黄素组( 40 μmol/L)、吉西他滨( 20 μmol/L)、吉西他滨联合大黄素组及对照组(生理盐水),流式细胞仪检测细胞凋亡, MTT法检测细胞增殖, Transwell小室模型检测胰腺癌细胞侵袭能力,实时荧光定量聚合酶链反应( qRT?PCR)检测 MDR?1、miRNA?1271及 EMT相关标志物( TWIST1、ZEB1、E?cadhcrin) mRNA表达,流式细胞仪检测 MDR?1编码的 P糖蛋白( P?gp)阳性率,蛋白质免疫印迹法检测肿瘤组织凋亡相关蛋白［B淋巴细胞瘤 2(Bcl?2)及其相关 X蛋白( Bax)、胱天蛋白酶 3(Caspase?3)及 Survivin］及 EMT相关标志物蛋白含量。结果联合组可显著抑制胰腺癌 SW1990细胞增殖和侵袭, SW1990细胞凋亡率显著更高,与其他三组比较差异有统计学意义( P＜0.05)。联合组 MDR?1 mRNA显著降低, miRNA?1271及 E?cadhcrin mRNA显著升高,且与其他组比较差异有统计学意义( P＜0.05)各组 TWIST1、ZEB1 mRNA水平比较差异无统计学意义( P＞0.05)。联合组可以显著抑制 Bcl?2、Caspase?3及 Survivin表达,上调,Bax表达,降低 Bcl?2、Bax比值,其效果明显高于吉西他滨组和大黄素组( P＜0.05)。联合组 E?cadhcrin蛋白表达显著高于其他组, P?gp、TWIST1、ZEB1蛋白表达显著低于其他组( P＜0.05)。结论大黄素能够下调 MDR?1降低胰腺癌细胞对吉西他滨耐药性,并能通过提高 miRNA?1271抑制胰腺癌细胞 EMT转化。     

5-FC诱导胞嘧啶脱氨酶基因修饰的胰腺癌细胞凋亡的研究(英文)

目的:探讨5-氟胞嘧啶(5-FC)对CD基因修饰的胰腺癌细胞凋亡的影响及特征。方法:以腺病毒介导的CD基因转染胰腺癌SW1990细胞,以Western blot检测基因蛋白表达,通过细胞形态学、DNA凝胶电泳和流式细胞术观察5-FC对表达CD基因的SW1990细胞凋亡的影响作用。结果:以含CD基因的重组腺病毒转染的SW1990细胞,给予5-FC(100μmol·L~(-1)),培养48h,细胞出现典型的凋亡形态、DNA梯带改变及凋亡峰,细胞在G_1、S和G_2/M各期分别为64％、11％和7％,凋亡率达34.6％。结论:5-FC的上述诱导凋亡作用可能是胰腺癌CD基因疗法的重要机制。     

Role of nuclear factor-kappaB on emodin-induced sensitization of pancreatic cancer to gemcitabine

In view of gemcitabine resistance has limited clinical activity of gemcitabine as a cellulotoxic drug in pancreatic cancer patients, this study is designed to investigate the effect of emodin on the sensitivity of pancreatic cancer to gemcitabine as well as its mechanism. After gemcitabine-resistant pancreatic cancer cell line (SW1990/GZ) was established by escalating doses of gemcitabine serially in pancreatic cancer cell line (SW1990). The cellular proliferation was detected by cell counting kit-8 (CCK-8) assay. Flow cytometry (FCM) was used to determine apoptosis of pancreatic cancer cells. The activity of NF-kappaB in pancreatic cancer cells was measured by electrophoretic mobility shift assay (EMSA). Western blotting was used to detect the protein expression of Bcl-2 and Survivin in SW1990/GZ cells. Metastatic model simulating human pancreatic cancer was established by orthotopic implantation of histologically intact human tumor tissue into pancreatic wall of nude mice. Also, immunohistochemistry was used to detect the positive expression of Ki-67, NF-kappaB, Bcl-2 and Survivin in the tumors. The results show that pretreatment of cells with emodin followed by gemcitabine induced a higher percentage of growth inhibition and apoptosis of pancreatic cancer cells than that of gemcitabine alone. In addition to in vitro results, emodin in combination with gemcitabine is much more effective as an antitumor agent compared to either agent alone in the orthotopic tumor model. Further study showed that the emodin with or without gemcitabine significantly down-regulates NF-kappaB and its regulated molecules such as Bcl-2 and Survivin proteins both in vitro and in vivo. It is concluded that inactivation of NF-kappaB signaling pathway by emodin resulting in the chemosensitization of pancreatic cancer to gemcitabine, which is likely to be an important and novel strategy for the treatment of pancreatic cancer.     

Role of lipoxygenase pathways in the regulation of pancreatic cancer cell proliferation and survival

Pancreatic cancer is characterized by a poor prognosis and lack of response to conventional therapy. Many studies have shown an association of pancreatic cancer development and growth with high dietary fat intake, especially intake of n-6 polyunsaturated fats. A growing body of evidence suggests that specific metabolites of arachidonic acid act as important elements in signaling pathways necessary for cancer cell transformation, growth and metastasis, via both cyclooxygenase (COX) and lipoxygenase (LOX) pathways. This review summarizes the current research status on the role of LOX on pancreatic cancer cell growth and apoptosis as well as the underlying signaling pathways involved. The proliferation of pancreatic cancer cells is inhibited by LOX inhibitors and stimulated by LOX metabolites. LOX inhibition even blocks growth stimulated by exogenous growth factors such as epidermal growth factor (EGF). Pancreatic cancer cell apoptosis (programmed cell death) is induced by blockade of either 5-LOX or 12-LOX pathways. Preliminary evidence suggests that the expression of both 5- and 12-lipoxygenases are upregulated in pancreatic cancer. The direct stimulation of pancreatic cancer cell proliferation by the metabolites of 5-LOX and 12-LOX (5-HETE and 12-HETE, respectively) is mediated by multiple signaling pathways, particularly the MEK/ERK signaling pathway but also involving intracellular tyrosine kinases. Thus, LOX pathways play an important role in pancreatic cancer cell proliferation and apoptosis and these pathways are likely to be valuable targets for development of therapeutics for this devastating disease.     

复方苦参注射液联合化疗对人胰腺癌的抑制作用

目的:探索复方苦参注射液对人胰腺癌细胞SW1990的体外直接抑制作用,以及不同浓度的苦参注射液与化疗联合应用时的协同作用。方法:采用MTT法检测不同浓度的复方苦参注射液以及复方苦参注射液与化疗药联合应用对人胰腺癌细胞SW1990的体外抑制率。结果:不同浓度的复方苦参注射液均对人胰腺癌细胞SW1990有抑制作用,其抑制作用与浓度成正相关,不同浓度的苦参注射液与化疗药联用对人胰腺癌细胞SW1990的体外抑制作用均明显高于单用化疗药。结论:复方苦参注射液对人胰腺癌细胞SW1990有体外直接抑制作用,该药联合化疗有协同抗肿瘤作用。     

冬凌草甲素通过下调XIAP增强吉西他滨对胰腺癌SW1990的抑制作用

【摘要】目的探讨冬凌草甲素在体外联合吉西他滨对胰腺癌细胞株SW1990抑制作用及其可能机制。方法 不同浓度的冬凌草甲素（0、10、20、40、80、160μmol/L）作用胰腺癌SW1990细胞24、48、72h后,CCK-8法检测胰腺癌细胞株SW1990细胞的增殖作用;冬凌草甲素（40μmol/L）与吉西他滨（20μmol/L）单独及联合处理细胞48h,并设立对照组, CCK-8法检测SW1990细胞的存活率;Annexin V-FITC/PI双染流式细胞术检测细胞凋亡情况;RTPCR检测SW1990细胞中NF-κB和XIAP基因的表达水平。结果冬凌草甲素对胰腺癌SW1990细胞的增殖抑制作用呈明显的剂量与时间依赖性;与其他各组相比,冬凌草甲素联合吉西他滨组细胞存活率明显降低（P<0.05）,凋亡率显著升高（P<0.05）;另外,联合组明显下调胰腺癌细胞中NF-κB和XIAP表达水平（P<0.05）。结论冬凌草甲素在体外能显著增强吉西他滨对胰腺癌SW1990细胞的抗瘤效果,其机制可能是通过下调NF-κB及其下游XIAP 的表达,进而诱导胰腺癌细胞的凋亡而实现.     

姜黄素联合伊立替康对结肠癌SW620细胞的体外抑制作用

目的研究姜黄素增强伊立替康对结肠癌SW620细胞的体外抑制作用,并探讨其作用机制。方法 MTT法检测不同质量浓度伊立替康和姜黄素单用或联合用药对SW620细胞增殖的影响;流式细胞仪检测不同质量浓度伊立替康和姜黄素单用或联合用药对SW620细胞凋亡的影响,比较细胞凋亡率;采用蛋白质印记法检测不同质量浓度伊立替康和姜黄素单用或联合用药对SW620细胞内拓扑异构酶I蛋白表达水平的影响。结果伊立替康和姜黄素单用均对SW620细胞增殖具有抑制作用,呈浓度和时间相关性。5、50μg/mL伊立替康分别与0~30μg/mL姜黄素联合处理SW620细胞12、24、48 h均具有协同抑制细胞活性的作用,且呈浓度和时间相关性。高质量浓度比低质量浓度的伊立替康与姜黄素联合用药抑制效果显著(P0.01)。0、20μg/mL姜黄素分别与0、5、50μg/mL伊立替康联合处理SW620细胞12、24、48 h,姜黄素可以增强伊立替康诱导的SW620细胞凋亡率。20μg/mL姜黄素联合5、50μg/mL伊立替康显著上调了SW620细胞内拓扑异构酶-Ⅰ蛋白的表达,协同诱导了SW620细胞内拓扑异构酶-Ⅰ蛋白的表达。结论伊立替康联合姜黄素可以协同增强对SW620细胞活性的抑制作用,协同诱导SW620细胞凋亡,其作用机制可能与伊立替康、姜黄素上调拓扑异构酶-Ⅰ表达有关。     

A mechanistic study of colon cancer growth promoted by cigarette smoke extract

Substantial evidence indicates that significant exposure to cigarette smoke is associated with an elevated risk for colorectal cancer. However, the mechanisms underlying the causal relationship between cigarette smoking and colorectal cancer remain to be investigated. Our previous study showed that cigarette smoke promotes the formation of inflammation-associated colonic adenoma in mice through an angiogenic pathway. Therefore, in the present study, we used the human colon adenocarcinoma cell line, SW1116, and human umbilical vascular endothelial cells (HUVECs) to elucidate the possible mechanisms in vitro. Results showed that cigarette smoke extract enhanced cell proliferation and the expression of 5-lipoxygenase (5-LOX), vascular endothelium growth factor (VEGF), matrix metalloproteinases (MMPs) 2 and 9 in SW1116 cells. Inhibition of 5-LOX decreased cell proliferation and expressions of VEGF, MMP-2 and MMP-9 induced by cigarette smoke extract. In addition, cigarette smoke extract indirectly stimulated HUVEC proliferation, a biological activity closely related to angiogenesis during tumor growth. This was again blocked by the 5-LOX inhibitor. Taken together, the results of the present study demonstrate the central role of 5-LOX and its relationship with angiogenic mediators in the actions of cigarette smoke in the promotion of angiogenesis during colon cancer growth.     

miR-10a在胰腺癌侵袭转移中的作用

目的 探讨microRNA-10a(miR-10a)在胰腺癌侵袭转移中的作用. 方法 选取2014年1月至2016年12月在赣南医学院第一附属医院切除的胰腺癌组织标本68例,同时选取癌旁组织作为对照,采用逆转录-聚合酶链反应(RT-PCR)检测组织标本miR-10a表达;同时选取胰腺癌细胞株Capan-1细胞,以脂质体转染法将miR-10a重组正、反义真核表达质粒载体转染Capan-1细胞,采用RT-PCR检测转染细胞miR-10a表达,Transwell和Matrigel试验观察转染细胞的迁移和侵袭能力,四甲基偶氮唑盐(MTT)法检测细胞增殖能力. 结果 胰腺癌组织miR-10a相对表达量为(0.213±0.024),明显高于癌旁组织(P<0.01);中低分化胰腺癌miR-10a相对表达量为(0.212±0.011),明显高于高分化胰腺癌(P<0.01);有淋巴结转移胰腺癌miR-10a相对表达量为(0.217±0.017),明显高于无淋巴结转移胰腺癌(P<0.05);TNM分期为Ⅲ~Ⅳ期胰腺癌miR-10a相对表达量为(0.230±0.015),明显高于Ⅰ~Ⅱ期胰腺癌(P<0.01).转染48 h后,正义组miR-10a相对表达量为(0.021±0.010),明显高于反义组、空载组和空白对照组(P<0.05);反义组miR-10a相对表达量为(0.003±0.001),明显低于空载组和空白对照组(P<0.05).正义组24 h和48 h 光密度(OD)值分别为(0.602±0.018)和(0.753±0.041),明显高于反义组、空载组和空白对照组(P<0.05);反义组24 h和48 h OD值分别为(0.451±0.023)和(0.591±0.038),明显低于空载组和空白对照组(P<0.05).正义组迁移和侵袭细胞数分别为(85.22±12.10)个和(140.24±30.54)个,明显高于反义组、空载组和空白对照组(P<0.05);反义组迁移和侵袭细胞数分别为(12.52±3.22)个和(20.41±8.66)个,明显低于空载组和空白对照组(P<0.05). 结论 miR-10a过表达可对胰腺癌有生长促进、增强侵袭和迁移的作用,值得进一步研究.     

Assessing 12(S)-lipoxygenase inhibitory activity using colorectal cancer cells overexpressing the enzyme.

12(S)-Lipoxygenase (LOX) is regarded as a pro-tumorigenic enzyme and as a potential target for therapy and prevention of cancer so that the search for specific 12(S)-LOX inhibitors is part of drug development strategies. To facilitate the identification of specific 12(S)-LOX inhibitors we have created an assay cell line by introducing a12(S)-LOX expression vector into SW480 colorectal cancer cells. When arachidonic acid was supplied in the medium both transiently and stably overexpressing cells produced 12(S)-hydroxytetraenic acid (HETE) originating from the transfected gene at 4-5-fold the amount obtained from control transfectants. 12(S)-HETE production was 1913.7+/-17.2pg/ml and reached a steady state level 24h after addition of arachidonic acid. To demonstrate the models suitability of 12(S)-LOX overexpressing SW480 cells they were used to measure the inhibitory activity of the plant phenols baicalein, kaempferol, quercetin, nordihydroguaretic acid and resveratrol which are known for their chemopreventive as well as LOX-inhibitory activity in different tumour models. All 5 compounds inhibited 12(S)-HETE production at concentrations below those necessary for growth inhibition.