Androgen receptor isoforms in human prostatic cancer tissue and LNCaP cell line

Aim: To investigate the androgen receptor (AR) isoform expressions in human prostatic cancer tissue and LNCaPcell line. Methods: With high resolution isoelectric focusing (IEF) method we demonstrated the different expres-sions of AR isoforms in human prostatic cancer tissues and LNCaP cell line. Results; Data were obtained from threeprostatic cancer specimens and the LNCaP cell line. Three types of AR isoforms were detected with pI values at 6.5,6.0, and 5.3. For the 3 prostatic cancer specimens, 1 sample showed all the three types of AR isoforms, the secondspecimen expressed at 6.5 and 6.0, and the third failed to show any type of isoforms. The LNCaP cell line expressedall the three AR isoforms. Binding of ~3H-dihydrotestosterone (~3H-DHT) to these three isoforms was inhibited by the ad-dition of 100-fold excess of DHT or testosterone, while not by progesterone, oestradiol and diethylstilboestrol. Conclu-sion : The expression of AR isoforms is different in different prostate cancer tissues, which may be related to the dif-ference in the effect of anti-androgen therapy in different patients. (Asian J Androl 2001 Sep; 3: 223 - 225)

Cytotoxicity of epigallocatechin-3-gallate to LNCaP cellsin the presence of Cu^(2+)

Epigallocatechin-3-gallate (EGCG) has shown remarkably anti-cancer activity, with its bioactivity being related to reactive conditions, such as pH and metal ions. The present study investigated the degradation of EGCG and its effect on prostate cancer cell in the presence of Cu2+. EGCG was incubated with prostate cancer cells, LNCaP, pretreated with or without Cu2+.EGCG in F-12 medium was quantified using HPLC and the viability of cells was assessed by gel electrophoresis, flow cytometry,and electron microscope. The results of HPLC showed that EGCG degraded completely within 12 h in F-12 medium with or without Cu2+. Gel electrophoresis and flow cytometry did not detect apoptosis of LNCaP cells when they were incubated with EGCG. Electron microscopy examination revealed that EGCG-Cu2+ complex led to damage of cytoplasm membrane in LNCaP cells. It was speculated that not EGCG, but its oxide and complex with Cu2+, are the bioactive components responsible for its cytotoxicity to LNCaP prostate cancer cells.

Inhibitory Effect of Matrine on the Expression of PSA and AR in Prostate Cancer Cell line LNCaP

In order to investigate the inhibitory effect of matrine on the expression of prostate specific antigen （PSA） and androgen receptor （AR） in prostate cancer cell line LNCaP in vitro, LNCaP cells were treated with matrine at different concentrations （0.5, 1.0, 1.5, 2.0 g/L） for 12-36 h. The growth activities of cancer cells were determined by MTT colorimetric assay. The AR level was measured by Western blotting. The expression of PSA was detected by using AXSYM system-chemical luciferase methods. The results showed that matrine could effectively inhibit the growth of androgen-dependent prostate cancer cell line LNCaP in vitro in a time-and dose-dependent manner （P〈0.05）. It could obviously decrease the level of AR （P〈0.01） and inhibit the expression of PSA in a dose-dependent manner （P〈0.05） in LNCaP cells. It was concluded that matrine could significantly suppress the growth of LNCaP cells and inhibit the expression of PSA and AR of prostate cancer cells.

The Effect of Curcumin on Proliferation and Apoptosis in LNCaP Prostate Cancer Cells

OBJECTIVE To observe the effect of curcumin on proliferation and apop-tosis in the prostate cancer LNCaP cell line. METHODS The AXSYMTM system luciferase method was used to examine the effect of various concentratious of curcumin on the content of prostate specific antigen (PSA) in prostate cancer LNCaP cells. A pGL3-PSA luciferase expression vector, containing 640 bp DNA of the PSA gene 5' -promoter region was constructed and transfected into the LNCaP cells with lipofectin. By measuring luciferase activity, the effect of 10 μmol/L, 20 μmol/L, 30 and 40 μmol/L curcumin on the promoter was studied. Effects on cell growth and apoptosis were analyzed by microscopy, the MTT colorimetric assay and flow cytometry. Western-blotting was used to measure expression of the androgen receptor (AR) in the LNCaP cells treated with different concentrations of curcumin. RESULTS The results showed that the expression of PSA was inhibited as curcumin reduced the activity of luciferase. Curcumin also caused a sigificant concentration-dependent decrease in AR expession measured by Western -blotting. Cell growth was inhibited and apoptosis was induced. CONCLUSION By inhibiting AR expression, curcumin reduced the function of the PSA promoter and inhibited PSA protein expression. Curcumin decreased the cellular proliferation and induced apoptosis in LNCaP cells in a concention-dependent manner.

沉默CD147对前列腺癌LNCaP细胞糖酵解的影响

目的:探讨CD147对前列腺癌(PCa)LNCaP细胞糖酵解的影响,为PCa临床诊断和治疗提供新的分子标志物和靶点。方法:采用慢病毒感染系统建立沉默CD147的细胞作为LNCaP/shCD147组,同时设立阴性对照组(LNCaP/scramble组)。采用实时荧光定量PCR(RT-qPCR)法检测2组LNCaP细胞中CD147 mRNA表达水平,试剂盒检测2组LNCaP细胞中乳酸(LA)、丙酮酸(PA)和腺嘌呤核苷三磷酸(ATP)浓度及2组LNCaP细胞中丙酮酸激酶(PK)、6-磷酸果糖激酶1(PFK1)和己糖激酶(HK)酶活性,Western blotting法检测2组LNCaP细胞中CD147、HK2、肌肉磷酸果糖激酶(PFKM)和丙酮酸激酶M2(PKM2)蛋白表达水平。结果:与LNCaP/scramble组比较,LNCaP/shCD147组细胞中CD147 mRNA和蛋白表达水平明显降低(P<0.01),表明成功构建沉默CD147的PCa LNCaP细胞模型。与LNCaP/scramble组比较,LNCaP/shCD147组细胞中LA、PA和ATP浓度明显降低(P<0.05或P<0.01)。与LNCaP/scramble组比较,LNCaP/shCD147组细胞中PK、PFK1和HK酶活性明显降低(P<0.05或P<0.01)。Western blotting法检测,与LNCaP/scramble组比较,LNCaP/shCD147组细胞中HK2蛋白表达水平明显降低(P<0.01)。结论:沉默CD147通过调节糖酵解代谢产物、限速酶活性和相关蛋白表达水平抑制LNCaP细胞糖酵解过程。

Inhibitory effects of apogossypolone on subcutaneous implants of human LNCaP prostatic carcinoma cells

Objective:The aim of this study was to investigate the inhibitory effect of apogossypolone (ApoG2) on subcutaneous implants of human LNCaP prostatic carcinoma cells, and explore its mechanism. Methods:To establish human LNCaP prostatic carcinoma cell line subcutaneous xenograft models and observe the inhibitory effect of ApoG2 on the tumor model. Immunohistochemistry was employed to observe the expression of Bcl-2, PCNA, CD31, caspase-3 and-8 in tumor tissues. The microvessel density was calculated. Results:ApoG2 could obviously inhibit the growth of subcutaneous prostatic carcinoma implant. ApoG2 decreased the expression of PCNA and CD31, and increased the expression of caspases-3,-8 in tumor tissues. Conclusion:ApoG2 has an inhibitory effect on prostatic carcinoma implants.

Further Analytical Studies on a Mercuri Thiol Adduct Isolated from a Human Prostate Cancer Cell Line (LNCaP)

Thiols play vital roles in cellular metabolism knowledge of which may be important in the design of future anticancer drugs. Previous work on the composition of the thiols present in human cancer cell lines has shown the presence of an unknown low molecular weight species, deemed to be a “Conthiol”, which could be important in this respect. This was prepared and isolated from a human prostate cancer cell line (LNCaP) in the form of an adduct of 2-mercuri-4-nitrophenol;it accounts for 56.5% of the total cellular thiols present in this cell line. Initial LC-MS analysis of this adduct had indicated that the possible molecular weight of the thiol was in the region of 467 daltons. In further analytical studies to identify the thiol, attempts were made to release it from the adduct by passage through a Thiopropyl Sepharose6B column. LC-MS analysis of the column eluate revealed two components yielding negative ion fragments of 427 m/z and 449 m/z. Only the former component contained thiol, indicating that a breakdown and/or possible rearrangement of the Conthiol had occurred. Further investigations of the column thiol eluate using ICP-MS analysis showed that the sulfur content agreed with the spectrophotometric analysis result (Ellman assay) and that the molecule did not contain phosphate. Amino acid analyses of the eluate were negative. In an attempt to prevent the breakdown of the thiol released by the Thiopropyl Sepharose 6B column, the adduct was treated with 5% v/v bromine water prior to applying to the column. In this instance the thiol containing eluate obtained from the column was treated with an equimolar quantity of mercuric chloride forming a fresh adduct, RS-Hg-SR. LC-MS analysis of this mercurial adduct detected a negative ion fragment of 782 m/z which on further ionization gave a ladder like pattern showing loss of mass units of 58 in each rung. This would seem to suggest the presence of a repeat polymer like structure containing 5 monomers, which, plus the thiol atom, gives a possible formula weight of 322;probably revealing only a part of the unknown Conthiol molecule whose properties and formula weight do not correlate with any known cellular thiol. Further analysis of the thiol released from the adduct on the Thiopropyl Sepharose 6B column by Infra-red (FTIR) provided little information except to confirm the presence of the thiol group and C=O stretch bands together with the possibility of a lactam ring at 1651 and 1634 cm·s-1.

The effect of interleukin 6 on the growth of LNCaP and PC-3 prostatic carcinoma cells

Objective To investigate the effect of IL-6 on prostatic carcinoma cell lines, and differential effects on androgen-dependent and androgen-independent prostatic carcinoma cells. Methods The IL-6 producing capacities of LNCaP and PC-3 cells were determined, and effects of exogenous IL-6 and anti-IL - 6 antibodies on LNCaP and PC - 3 cells were examined. Results LNCaP produced a very small amount of IL-6, but PC-3 produced more, the concentraion of IL-6 being 190 pg/48 h per ml(1 × 106). The exogenous IL-6 inhibited LNCaP growth significantly,but had no obvious effect on PC -3 cells. Anti-IL-6 antibodies lowered PC-3 cells growth rate but had neutral effect on LNCaP. Conclusion PC-3 cells produces IL-6 massively in autocrine manner. IL-6 could be antagonized by anti-IL-6 antibodies,resulting in slowing PC-3 cells growth, and LNCaP cells growth could be inhibited by exogenous IL-6.7 refs,2 tabs.

靶向TRPV6的siRNA对前列腺癌LNCaP细胞抑制作用的体外研究

目的:运用RNA干扰(RNAi)技术阻断前列腺癌LNCaP细胞中瞬时感受器电位离子通道蛋白V亚家族6(TRPV6)基因的表达,探讨TRPV6基因沉默对LNCaP细胞增殖、细胞周期及凋亡的影响。方法:针对TR-PV6基因,构建2条小干扰RNA(siRNA)序列;在脂质体介导下转染前列腺癌LNCaP细胞,用RT-PCR测定TRPV6mRNA的表达;MTT法和流式细胞技术测定siRNA对LNCaP细胞增殖、细胞周期及凋亡的影响。结果:两条siRNA序列均能有效地阻断LNCaP细胞中TRPV6基因在mRNA水平上的表达(P<0.01),且mRNA表达随着转染时间的延长而减少,转染72h后TRPV6mRNA的表达减少至对照组的27%和23%;siRNA转染能显著抑制LNCaP细胞增殖,转染48h细胞增殖抑制率最高,分别为34.53%和29.32%,与转染24h和72h比较有统计学意义(P<0.05);转染48h后,siRNA转染组G0～G1期细胞增多,S期细胞数量明显减少,与空白对照组及阴性对照组相比有统计学差异(P<0.01);siRNA转染组细胞的凋亡率分别为14.45%和12.73%,显著高于空白对照组及阴性对照组3.78%和5.22%(P<0.05)。结论:针对TRPV6的siRNA在体外能有效地抑制LNCaP细胞TRPV6mRNA的转录,同时能够抑制前列腺癌LNCaP细胞增殖,使细胞周期出现G0/G1期阻滞,细胞凋亡率显著增加。

下调基因PTTG1表达对前列腺癌LNCaP-AI细胞增殖、侵袭和凋亡的影响

目的:探讨下调垂体肿瘤转化基因1(PTTG1)表达对雄激素非依赖性前列腺癌LNCa P-AI细胞增殖、侵袭、凋亡,以及对雄激素拮抗剂敏感性的影响。方法:LNCa P-AI细胞转染靶向PTTG1基因的siRNA,MTT法检测细胞增殖,Transwell法检测细胞侵袭,流式细胞术检测细胞凋亡,Western印迹检测PTTG1、p-Akt、p-ERK等蛋白表达水平,琼脂糖凝胶电泳法检测PTTG1 mRNA表达水平。结果:siRNA有效抑制了PTTG1的表达;下调PTTG1表达有效抑制了LNCa P-AI细胞在去雄激素培养液中的增殖,24、48、72 h抑制率分别为(19.47±2.12)%、(24.01±2.13)%、(48.02±2.22)%,组间比较有显著性差异(P<0.05);降低其侵袭力,Transwell试验显示,对照组、转染24、48、72 h后穿过聚碳酸酯膜细胞个数分别为111.11±13.47、74.67±9.85、56.44±8.66、37.33±6.14,组间比较有显著性差异(P<0.01);siRNA-PTTG1转染LNCa P-AI细胞后,空白对照组、转染24、48、72 h后凋亡率分别为(2.17±0.49)%、(18.32±0.94)%、(19.94±1.30)%、(21.73±1.88)%,各组间比较有显著性差异(P<0.05)。siRNA联合氟他胺组对LNCa P-AI增殖的抑制作用和促凋亡作用显著强于siRNA或者氟他胺组,并呈氟他胺浓度相关性;50 nmol/L氟他胺、siRNA联合50 nmol/L氟他胺对LNCa P-AI的抑制率分别为(27.13±3.52)%、(67.51±5.13)%,两组间比较有显著性差异(P<0.05);凋亡率分别为(3.94±0.48)%、(19.93±1.72)%,两组间比较有显著性差异(P<0.05);100 nmol/L氟他胺、siRNA联合100 nmol/L氟他胺的抑制率分别为(43.72±3.90)%、(73.19±4.78)%,两组间比较有显著性差异(P<0.05);凋亡率分别为(5.33±0.66)%、(23.43±1.76)%,两组间比较有显著性差异(P<0.05)。结论:siRNA下调PTTG1表达能够抑制LNCa P-AI的增殖和侵袭,促进凋亡,提高了LNCa P-AI细胞对雄激素拮抗剂氟他胺的敏感性,抑制PTTG1表达可能会强化雄激素剥夺治疗晚期前列腺癌的作用。

激素递减法成功建立雄激素非依赖性LNCaP细胞亚系

目的:利用激素递减法对LNCaP细胞进行去雄环境培养,建立雄激素非依赖的LNCaP细胞(LNCaP-AI)亚系并予以鉴定。方法:利用活性炭处理的血清培养模拟去雄细胞环境,逐步递减培养基中激素10d,后完全在非雄培养,共连续培养3个月,直到LNCaP细胞重新进入快速生长期,利用CCK-8法、放免法、RT-PCR法分别测定细胞生长曲线、PSA及雄激素(AR)表达情况。结果:LNCaP细胞在激素递减后,生长缓慢,呈神经内分泌样改变和成簇生长,经过共3个月的连续非雄培养,细胞重新恢复以前的形态及生长。CCK-8测定提示LNCaP-AI细胞能够在去雄环境中生长,放免法提示LNCaP-AI细胞能够在去雄环境中恢复分泌PSA功能,RT-PCR方法提示LNCaP-AI细胞显著高表达AR。结论:激素递减方法可以3个月左右有效地建立雄激素非依赖的LNCaP细胞亚系。

黄精凝集素PCL-2诱导人前列腺癌LNCap细胞凋亡及机制研究

研究黄精凝集素PCL-2对人前列腺癌LNCap细胞生物活性和可能的抗肿瘤机制。从黄精药材中提取分离得到黄精凝集素PCL-2,体外培养LNCap细胞,采用WST-1和集落形成实验评价PCL-2对LNCap细胞的增殖作用;2,7-二氯荧光黄双乙酸盐(DCFH-DA)荧光探针法检测LNCap细胞内ROS含量;qRT-PCR和Western blot法检测PCL-2对LNCap细胞中相关基因和蛋白表达的影响。研究结果显示PCL-2能显著抑制LNCap细胞的增殖,促进细胞中ROS生成;PCL-2通过上调LNCap细胞中Bax、Caspase-3及Caspase-9基因mRNA和蛋白表达并下调Bcl-2基因mRNA和蛋白表达水平诱导LNCap细胞凋亡。本研究结果表明PCL-2诱导LNCap细胞凋亡活性作用显著,可作为抑制前列腺癌的潜在药物。

多肽K237与前列腺癌细胞系LNcap的亲和性

目的:研究多肽K237与前列腺癌细胞系LNcap的亲和性。方法:采用免疫组化染色和RT-PCR,检测与K237结合的VEGF受体KDR的表达;用流式细胞仪和激光共聚焦显微镜观察多肽K237与前列腺癌细胞系LNcap的结合能力。结果:前列腺癌细胞系LNcap中有KDR的表达;流式结果显示:多肽K237以浓度依赖性与LNcap细胞结合。激光共聚焦显微镜可观察到,多肽K237结合在LNcap细胞的胞浆和胞膜中。结论:多肽K237对前列腺癌细胞系LNcap具有较高的亲和性,为利用多肽K237通过抑制自分泌途径从而抑制前列腺癌细胞的增殖提供了基础,为肿瘤的治疗提供了新的方法。

环巴胺对人前列腺癌LNCaP细胞增殖和凋亡作用及对PCA3基因表达的影响

目的:探讨环巴胺对人前列腺癌LNCaP细胞增殖和凋亡的作用及对PCA3基因表达的影响。方法:不同浓度环巴胺(1、5、10、15μmol/L)干预LNCaP细胞,以只加入RPMI 1640培养液为空白对照组,分别在不同作用时间(24、48、72h),用MTT法检测其对细胞增殖的抑制、流式细胞术观察细胞凋亡率变化、Hoechst染色观察凋亡细胞形态变化、实时荧光定量逆转录聚合酶链反应(FQ-RT-PCR)观察对PCA3基因表达的影响。结果:5、10、15μmol/L环巴胺对LNCaP细胞增殖均有显著抑制作用,与空白对照组相比差异有显著性(P<0.01),10μmol/L组于48h达到半数抑制量(IC50);10、15μmol/L组24、48、72hLNCaP细胞的凋亡率分别为37.21%、57.38%、57.98%和21.16%、71.31%、72.90%,与空白对照组相比差异均有显著性(P<0.01)。随着环巴胺浓度增大和作用时间的延长,LNCaP细胞凋亡显著增加。PCA3基因的表达随着环巴胺浓度的上升呈现明显的递减趋势,较空白对照组显著降低(P<0.01)。浓度为10μmol/L时,不同作用时间PCA3基因的表达均极低。结论:环巴胺浓度为10、15μmol/L作用48、72h时能够明显抑制LNCaP细胞的增殖,诱导细胞凋亡,并显著下调LNCaP细胞PCA3基因的表达。

双氢睾酮对LNCaP细胞系Smad3和Smad4转录及表达的影响

目的:探讨双氢睾酮(DHT)对前列腺癌细胞系LNCaP中转化生长因子β(TGFβ)信号通路的下游信号蛋白Smad3、Smad4的基因转录及表达是否有影响,氟他胺对这些影响有无拮抗作用。方法:用含不同浓度DHT(2、10、50nmol/L)和氟他胺(100nmol/L)的RPMI1640培养液培养LNCaP细胞株。RTPCR检测LNCaP细胞中Smad3、Smad4mRNA水平,Western印迹法检测Smad3、Smad4蛋白表达情况。结果:与不含DHT和氟他胺的对照组比较,10、50nmol/LDHT明显增强LNCaP细胞中Smad3mRNA的表达(P<0.05),不同浓度的DHT均使Smad3蛋白的表达增高(P<0.05),氟他胺明显抑制DHT的这种增强作用(P<0.05);10nmol/L浓度的DHT对Smad4mRNA的转录有明显的抑制作用(P<0.05),这种抑制作用受氟他胺的抑制,不同浓度的DHT均可以使Smad4蛋白的表达下降,而且下降程度要比Smad4mRNA下降更为明显(P<0.05),氟他胺能够减轻这种抑制作用。结论:DHT能够增强Smad3mRNA的转录和表达,而对Smad4mRNA的转录和表达有抑制作用,氟他胺可以不同程度地抑制DHT的这些作用。雄激素受体(AR)信号通路和TGFβ信号通路可能在Smads水平上存在交联。

依立雄胺对前列腺癌细胞(LNCaP)前列腺特异性抗原和Bcl-2蛋白体外表达的抑制作用

目的 为研究依立雄胺治疗前列腺癌的可能性及可能机制 ,探讨依立雄胺体外对人激素依赖型前列腺癌细胞 (LNCaP)生长及前列腺特异性抗原(PSA)与Bcl 2蛋白表达的作用。方法 用 5 ,15和4 5 μmol·L- 1的依立雄胺作用LNCaP细胞 3d或 7d后 ,相差显微镜进行细胞形态学观察 ;台盼蓝染色活细胞计数 ,绘制 7d的生长曲线 ;应用流式细胞仪分析依立雄胺对LNCaP细胞凋亡的影响 ;应用免疫组化ABC比较经依立雄胺作用后LNCaP细胞PSA与Bcl 2蛋白的表达强度。结果 4 5 μmol·L- 1的依立雄胺作用LNCaP细胞 3d后 ,可使其明显的皱缩脱壁 ,部分细胞膜破裂。在 5 ,15和 4 5 μmol·L- 1的依立雄胺作用 7d后 ,可明显抑制LNCaP细胞的生长 ,抑制率分别达 4 0 .0 % ,4 7.4 %和 5 4 .3% ;流式细胞仪分析显示上述浓度的依立雄胺可诱导细胞凋亡 ,凋亡率分别为 3.5 % ,15 .8%和 2 5 .0 % ,而对照组为2 .2 % ;免疫组化分析表明依立雄胺可降低LNCaP细胞PSA和Bcl 2蛋白的表达。结论 在上述浓度下依立雄胺可特异性的抑制LNCaP细胞的生长和PSA与Bcl

藤茶提取物通过PI3K/Akt/Bcl-2途径抑制人前列腺癌LNCaP细胞增殖的机制研究

目的探讨藤茶提取物对人前列腺癌细胞LNCaP细胞增殖抑制的作用机制。方法 LNCaP细胞分为对照组、藤茶提取物不同浓度组,MTT法检测细胞的增殖抑制率,计算半数抑制浓度(IC50),流式细胞术Annexin V/PI双染法检测细胞凋亡率,Western-blot法检测PI3K/Akt通路PI3K、Akt、p-Akt、Bcl-2蛋白的表达。结果藤茶提取物在10~50μg/mL浓度范围内对LNCaP细胞增殖抑制作用随剂量的升高而升高,IC50为28.45μg/mL;与对照组比,藤茶提取物25、50μg/mL处理组LNCaP细胞凋亡率明显升高(P<0.05,P<0.01),p-Akt、Bcl-2蛋白表达显著下调(P<0.05,P<0.01)。结论藤茶提取物对LNCaP细胞具有增殖抑制作用,其机制可能是通过抑制PI3K/Akt细胞信号通路下调Bcl-2蛋白表达从而促进凋亡。

高压氧对人前列腺癌LNCaP细胞株小鼠荷瘤模型作用的研究

目的:评估应用高压氧治疗前列腺癌放疗后出血性膀胱炎的安全性,探讨高压氧对体内前列腺癌细胞生长的影响。方法:采用人前列腺癌LNCaP细胞株皮下接种构建小鼠荷瘤模型(n=30),随机分为对照组(n=15)和实验组(n=15)。对照组常压常氧条件下饲养,实验组每周进行5次0.2MPa高压氧暴露,共计20次。连续观察4周两组移植瘤生长体积的变化,应用免疫组化法比较两组瘤体组织相关病理学特征指标:瘤体微血管密度(CD34)、瘤细胞增殖(Ki-67蛋白)以及瘤细胞凋亡(p53、p27蛋白)。结果:肿瘤接种后第28天,对照组移植瘤体积为(122.0±8.2)mm3,实验组为(120.0±7.9)mm3,两组差异无显著性(P>0.05);对照组移植瘤CD34及Ki-67、p53、p27蛋白表达的阳性细胞率分别为(36.2±4.9)%、(75.3±8.4)%、(44.2±5.7)%、(61.5±5.5)%,实验组分别为(39.3±5.2)%、(78.1±7.6)%、(40.4±6.2)%、(63.7±5.1)%,病理学特征均无显著性差异(P>0.05)。结论:高压氧对小鼠荷瘤模型前列腺癌细胞生长无促进作用,对前列腺癌中新生血管也无明显影响。

抑制SHARPIN激活Rip1促进LNCaP-AI细胞坏死性凋亡

目的:探讨SHARPIN对去势抵抗性前列腺癌细胞LNCaP-AI坏死性凋亡关键因子Rip1的调控作用,以及对细胞坏死性凋亡的影响。方法:将LNCaP-AI细胞分为TNF-α+Z-VAD(caspase抑制剂)处理组与TNF-α+Z-VAD+Nec-1(Rip1抑制剂)处理组,应用MTS检测各组细胞的活力,研究坏死性凋亡机制在诱导LNCaP-AI细胞死亡中的作用。将LNCaP-AI细胞分为阴性对照组和SHARPIN干扰(si-SHARPIN)组,RT-qPCR验证抑制效率,通过免疫荧光等技术进一步探讨SHARPIN调控坏死性凋亡的具体分子机制。结果:与对照组相比,TNF-α+Z-VAD处理组的LNCaP-AI细胞活力下降28%(P<0.05),而TNF-α+Z-VAD+Nec-1处理组的细胞在Rip1被抑制后,细胞活力无明显改变。在LNCaP-AI细胞中,通过siRNA抑制SHARPIN表达后,Rip1表达水平上调,同时,LNCaP-AI细胞坏死性凋亡比例升高。结论:LNCaP-AI细胞可通过坏死性凋亡机制诱导死亡,下调SHARPIN可能通过激活Rip1增强LNCaP-AI细胞坏死性凋亡。

左旋棉酚体外诱导人前列腺癌LNCaP细胞凋亡的研究

目的研究左旋棉酚对人前列腺癌LNCaP细胞体外增殖和凋亡的影响。方法 MTT法检测左旋棉酚对LNCaP细胞增殖的影响,透射电镜观察细胞超微结构的改变,TUNEL染色观察细胞凋亡,流式细胞术检测细胞周期的改变,半定量RT-PCR检测Bcl-2及BakmRNA的表达水平。结果左旋棉酚在体外能显著抑制LNCaP细胞增殖,呈浓度-时间依赖性。左旋棉酚可以诱导LNCaP细胞发生典型的凋亡形态学改变和G0/G1期阻滞。RT-PCR显示Bcl-2mRNA表达水平降低,BakmRNA表达水平升高。结论左旋棉酚在体外能诱导前列腺癌细胞凋亡,其主要原因可能与BakmRNA的表达升高及Bcl-2mRNA的表达下调有关。