Fas基因转染联合顺铂对直肠癌细胞杀伤作用的研究

目的探讨Fas基因转染联合顺铂对直肠癌细胞的杀伤作用。方法采用RT PCR技术从健康人的外周血单核细胞中扩增包含全部阅读框架的Fas全长基因 ,与 pGEM TEasy质粒连接 ,经测序验证。构建 pcDNA3 1 Fas真核表达载体 ,将人Fas基因通过脂质体导入直肠癌 8348细胞中 ,并利用RT PCR方法检测直肠癌 8348细胞的Fas基因mRNA表达。用MTT法分析顺铂对转染前后直肠癌细胞抑制增殖和诱导凋亡的作用。结果Fas基因转染可明显增强直肠癌 8348细胞的Fas表达 ,分别用 1、5、10、2 0、4 0mg/L浓度的顺铂作用 ,转染Fas基因的 8348细胞实验组细胞抑制率分别为 4 7 2 %、5 1 8%、5 7 2 %、6 5 4 %、71 0 % ;未转染Fas基因的 8348细胞对照组细胞抑制率分别为 2 9 6 %、33 0 %、37 8%、4 1 4 %、4 7 0 % ,2组相比 ,差异有显著性意义 (t =15 33,P <0 0 1)。结论转染的Fas基因可显著上调直肠癌 8348细胞的Fas表达 ,促进细胞凋亡 ,Fas基因转染联合顺铂对直肠癌细胞有更强的杀伤作用。     

FasL cDNA转染对直肠癌细胞顺铂耐药性的影响

目的:探讨FasLcDNA转染和表达对直肠癌细胞耐药性的影响。方法:用RT-PCR方法克隆人FasL全长cDNA,构建pcDNA3.1-FasL真核表达载体,用脂质体法转染HR-8348人直肠癌细胞,采用MTT法检测顺铂对转染和未转染直肠癌细胞的生长抑制率。结果:DNA测序证实克隆FasLcDNA898bp与GeneBank序列完全一致。构建真核表达载体转染HR-8348细胞后,FasLmRNA表达明显增强。在不同浓度顺铂(1、5、10、20、40mg/L)的作用下,FasL转染组直肠癌细胞抑制率分别为11.0%、25.4%、31.2%、37.8%、42.4%:对照组癌细胞抑制率分别为26.1%、34.4%、37.6%、42.9%、53.2%,其差异有显著性意义(t=4.43,P<0.05)。结论:FasL转染HR-8348细胞可增强癌细胞的耐药性,减弱顺铂对HR-8348细胞的杀伤作用。     

Fas/FasL与移植免疫耐受

Ｆａｓ/ＦａｓＬ介导的细胞程序性死亡(ＰＣＤ)在移植免疫耐受中发挥重要作用。研究发现睾丸及角膜等免疫赦免组织中均有持续的ＦａｓＬ表达〔1〕,体内外实验也表明ＦａｓＬ可有效地诱导Ｆａｓ Ｔ淋巴细胞凋亡〔2〕,故Ｆａｓ/ＦａｓＬ相互作用产生的移植免疫耐受倍受移植界关注。现将Ｆａｓ/ＦａｓＬ的结构功能及在移植免疫耐受中的作用作一综述。一、Ｆａｓ/ＦａｓＬ分子生物学特性Ｆａｓ又名ＡＰＯ 1,ＣＤ 95分子。最早利用杂交瘤技术得到多株识别淋巴细胞表面分子的单克隆抗体 ,Ｉｔｏｈ等〔3〕证实其中一株单克隆抗体即为ＡＰＯ 1分子。…     

顺铂联合胞嘧啶脱氨酶自杀基因对直肠癌细胞杀伤作用的研究

目的探讨顺铂联合胞嘧啶脱氨酶(CD)自杀基因对直肠腺癌细胞8348的杀伤作用。方法以绿色荧光蛋白(GFP)基因作为报告基因,观察在顺铂作用下GFP基因对8348细胞的转染效率;用克隆形成试验观察顺铂对CD基因转染效率的影响;同时用四甲基偶氮唑盐(MTT)试验检测顺铂联合CD/5-氟胞嘧啶(5-FC)对8348细胞的杀伤作用。结果顺铂提高质粒对8348细胞的转染效率26倍。对腺癌细胞的杀伤效率:单纯转染CD基因组为14.9%;IC50的氟尿嘧啶(5-FU)联合CD基因组为54.9%;IC50的顺铂联合CD基因组为88.5%,与其他两组相比,对癌细胞杀伤效率明显增强(P<0.01)。结论顺铂联合CD自杀基因能更有效地杀伤直肠腺癌细胞,可成为治疗直肠癌术后复发及转移的一种有效的方法。     

bcl-2和Fas/FasL系统在肝癌细胞凋亡中的作用

目的 探讨ｂｃｌ－２和Ｆａｓ／ＦａｓＬ系统在肝癌细胞凋亡过程中的作用。方法 应用免疫组织化学方法检测３６例肝癌和４９例肝硬化组织中ｂｃｌ－２、Ｆａｓ和ＦａｓＬ的表达,用ＴＵＮＥＬ法检测肝中的细胞凋亡。结果 肝癌组织与肝硬化组织比较, 细胞明显减少;肝癌和肝硬化组织中ｂｃｌ－２的表达率分别为１６．６６％和６７．３４％;Ｆａｓ的表达率分别为５２．７７％和７３．４７％;ＦａｓＬ的表达率分别为７２．２２％     

Fas基因转染对直肠癌细胞生物学行为影响的研究

目的：探讨Fas基因转染对直肠癌细胞生物学行为的影响。方法：以正常人外周血单个核细胞（PBMC）为模板，通过RT－PCR方法扩增出Fas全长cDNA，转染人直肠癌细胞HR－8348，检测Fas基因表达，观察细胞生长状态，采用MTT法观察癌细胞对中1芗反应及细胞存活率。采用H3342释放法检测PBMC对癌细胞的杀伤活性，结果，未转染的HR－8348细胞Fas基因表达为阴性，转染Fas后HR－8348细胞Fas表达阳性，两组细胞形态和生长状态无显差异，分别加入化疗药物5－Fu、卡铂，检测细胞存活率，在相同药物浓度下，两组细胞存活率有显性差异（t=4．73，3．84，P＜0．01）。Fas转染组癌细胞存活率低不转染组，Fas表达阳性癌细胞对5－Fu、卡铂的敏感性增强。PBMC对Fas转染组HR－8348细胞的杀伤活性为56％，对未转染组的杀伤活性为21％，两组有显性差异（X^2＝20．73，P＜0．01），PBMC对Fas阳性癌细胞杀活性明显高于对照组癌细胞。结论：转染Fas可提高癌细胞化疗药的敏感性，增强药物对癌细胞的杀伤作用，并促进机体免疫细胞的杀伤活性。     

大鼠急性胰腺炎细胞凋亡异常及Fas/FasL系统表达的研究

我们用大鼠制作急性水肿性胰腺炎(AEP)和急性坏死性胰腺炎(ANP)模型,检测胰腺炎时细胞凋亡异常以及凋亡通路Fas、FasL蛋白表达情况,进一步探讨细胞凋亡在急性胰腺炎发生发展中的作用和地位。一、材料和方法1.实验动物及方法:健康雄性SD大鼠3 0只,随机分为3组:AEP组、ANP组和对照组,每组10只。模型制作:大鼠常规喂养,手术前禁食不禁饮12h。1%硫喷妥钠溶液4ml/kg体重腹腔内注射麻醉,无菌操作下切开大鼠腹部,显露十二指肠及胰胆管。用钝5号注射器针头穿过十二指肠对系膜缘经乳头逆行插入胰胆管,用血管夹分别夹闭近肝门处胆总管及针头插…     

γ-干扰素对胆管癌细胞Fas/FasL系统调控作用的研究

目的 探索γ-干扰素（Interferon gamma,IFN-γ)对胆管癌细胞Fas/FasL系统的调控作用。方法 应用RT－PCR、Western blot、免疫组织化学、流式细胞仪和细胞培养技术，检测人胆管癌细胞株QBC939的Fas、FasL表达及相关功能，并研究IFN－γ对之的影响。结果 胆管癌细胞表达Fas、FasL基因及蛋白，并能致共同培养的Jurkat细胞发生凋亡；而IFN－γ可上调Fas、FasL基因（P＜0.01)及蛋白的表达，且调节作用呈剂量和时间依赖趋势；并能下调胆管癌细胞致Jurkat细胞凋亡的能力，在其剂量达500U／ml后更为明显。结论 IFN－γ可调控胆管癌细胞Fas/FasL系统的表达从而降低其发生免疫逃逸的能力；这为胆管癌的免疫治疗研究提供了新的资料。     

脂质体转染胞嘧啶脱氨酶基因、放射线、树突细胞联合对直肠癌细胞杀伤作用的研究

目的：探讨脂质体转染胞嘧啶脱氨酶（cytosine deaminase,CD)基因,放射线,树突细胞（dendritic,cells,DCs）三者联合治疗直肠癌的安全有效性。方法：应用放射线促进脂质体转染CD基因,再利用放射的增敏作用将直肠癌细胞杀死与DCs和T细胞共同孵育,通过测定^3H标记的胸腺嘧糖苷摄取情况,观察不同DCs数目对T细胞增殖的影响并用MTT法检测不同效靶比下的肿瘤细胞的杀伤率。结果：CD与5－氟胞嘧啶联合放射线杀死直肠癌细胞后所产生的凋亡小体和其他肿瘤抗原可有效的被DCs递呈给T细胞,产生细胞毒淋巴细胞,对肿瘤产生特异地杀伤作用。30：1,15：1,1：1效靶比的癌细胞的杀伤率分别为98.1%,76.2%和37．8％。结论：脂质体转染CD基因,放射线,DCs三者联合具有相互协同作用,可显著提高对癌细胞的杀伤率。     

Fas/FasL在强直性脊柱炎患者外周血T细胞亚群上的表达

目的检测强直性脊柱炎（As）患者外周血T细胞亚群上的Fas／FasL的表达水平，探讨Fas／FasL诱导的细胞凋亡在As免疫学发病机制中的作用。方法以临床确诊的60例As患者作为研究对象，同时选择30例正常对照，运用流式细胞仪（FCM）检测其外周血CD3^＋CD4^＋、CD3^＋CD8^＋T细胞亚群上的Fas／FasL表达水平。结果早、晚期AS患者外周血CD3^＋CD4^＋T细胞上的FasL的表达率分别为（0．59％、0．93％），CD3^＋CD8^＋T细胞上的FasL的表达率分别为（2．93％、4．32％），与健康对照组（0．48％、1．14％）比较，其表达率差异具有统计学意义（P〈0．05）；与健康对照组外周血CD3^＋CD4’、CD3^＋CD8’T细胞上的Fas表达率（58．25％、59．91％）比较，早期AS患者外周血CD3^＋CD4^＋T细胞上的Fas的表达率（64．75％）明显升高（P〈0．05），而CD3^＋CD8^＋T细胞上的Fas的表达率（48．64％）明显降低（P〈0．05），Fas在晚期AS患者外周血CD3^＋CD4^＋、CD3^＋CD8^＋T细胞上的表达率（57．63％、56．32％）无明显变化。结论Fas、FasL在外周血T细胞亚群上的表达水平与AS的病情发展阶段相关；Fas、FasL的异常表达所导致T细胞凋亡功能紊乱可能是AS发病的重要机制之一。     

FasL基因表达对缺氧状态下直肠癌细胞增殖凋亡的影响

目的探讨直肠癌侵袭转移过程中FasL基因表达对细胞增殖凋亡的影响。方法采用北京军区总医院普通外科实验室构建的4组不同侵袭力的人直肠癌HR-8348细胞亚型HR-8348B、HR-8348L、HR-8348F和HR-8348As,并用化学缺氧法构建上述4组细胞的缺氧12h模型,以Western印迹法验证各组细胞内FasL蛋白的表达水平和缺氧状态下细胞内FasL蛋白的表达,流式细胞仪测定细胞周期分布并计算细胞增殖指数,四甲基偶氮唑盐（MTT）法测定细胞增殖能力改变并计算细胞抑制率,末端标记法（TUNEL）测定细胞凋亡状况。结果Western印迹显示FasL蛋白于40000处显色。常氧条件下HR-8348F细胞内FasL的表达水平显著高于HR-8348B、HR-8348L和HR-8348As（F=361.149。P〈0.01）;缺氧12h时各组细胞均生长良好,形态较常氧状态皱缩;HR-834F,细胞内FasL的表达水平仍显著高于其他3组（F=278.766,P〈0.01）,但其自身常氧与缺氧状态下FasL的水平差异无统计学意义（t=1.762,P〉0.05）。缺氧12h后各组细胞增殖均受到抑制,HR-8348F细胞的增殖指数（60.43±3.72）显著高于HR-8348B（40.01±3.30）、HR-8348L（41.30±4.06）和HR-8348As（35.87±4.39）（F=39.477,P〈0.01）,增殖抑制率（17.30±1.98）和凋亡指数（13.10±1.04）显著低于HR-8348B（33.70±4.33和21.60±1.31）、HR-8348L（34.20±3.92和20.10±1.15）、HR-8348As（38.00±4.55和23.90±1.23）细胞（F分别为28.811和76.462,P〈0.01）。结论缺氧环境中,直肠癌细胞FasL表达增强可导致细胞增殖加速、凋亡减少和侵袭能力增强。促进细胞对微环境缺氧的耐受。     

药物流产失败者蜕膜细胞Fas/FasL的表达

目的探讨米非司酮药物流产(药流)失败与Fas/FasL的关系。方法选取要求终止妊娠孕8周妇女,自愿选择药流或人工流产两种方法,分为负压吸引组、药流失败组、药流完全组各20例。收集三组蜕膜组织采用免疫组织化学染色检测Fas/FasL的表达及图像分析仪定量分析。结果药流失败组及负压吸引组Fas、FasL表达显著低于药流完全组(P<0.01)。结论米非司酮通过促进Fas/FasL的表达以诱导蜕膜细胞凋亡,流产发生,药流失败与蜕膜细胞Fas/FasL的异常表达有关。     

结直肠癌组织中胃泌素的表达与Fas／FasL和天冬半胱氨酸蛋白酶的关系

目的了解胃泌素（GAS）mRNA及其蛋白在结直肠癌组织中的表达情况，并探讨其与结直肠癌细胞凋亡指数（AT）和凋亡调控基因Fas／FasL、天冬半胱氨酸蛋白酶（easpases）的关系。方法采用巢式RT-PCR方法检测79例结直肠癌组织中GAS的mRNA表达．用TUNEL法检测细胞凋亡情况，结直肠癌组织中GAS、Fas／FasL、caspase-3、caspase-8的蛋白表达采用免疫组织化学SP法。结果结直肠癌组织中GASmRNA与其蛋白表达呈正相关（rGAS=0．99，P〈0．01）．高、中分化结直肠癌组织中GASmRNA及其蛋白的表达明显低于低分化者（χ^2，（高与低）=10．47、10．23，均P〈0．01；χ^2（中与低）=6．68、4．95，均P〈0．05）；GASmRNA及其蛋白在乳头状腺癌、管状腺癌的阳性表达率明显低于黏液印戒细胞癌及未分化癌（χ^2（乳与黏印）=4．80、6．22，χ^2（乳与未）=5．44、8．43，χ^2（管与黏印）=4．40、4．38．χ^2（管与未）=4．92、6．43，均P〈0．05）；DukesA、B期的GASmRNA及其蛋白阳性表达率明显低于C、D期（χ^2=4．84、4．45，均P〈0．05）。GAS高、中表达组的细胞AI明显低于低表达组，差异有统计学意义（q（高与低）=6．71，q（中与低）=4．60，均P〈0．01）；FasL阳性表达率在GAS低、中、高表达3组间相比。差异具统计学意义（χ^2=9．35，P〈0．011，其中FasL在GAS高、中表达组的阳性表达率明显高于低表达组（χ^2（高与低）=6．24．χ^2（中与低）=4．74，均P〈0．05）：结论GAS对结直肠癌细胞凋亡的调控可能与Fas／FasL的表达失衡及其功能和信号系统的紊乱有关。GAS的检测可作为临床结直肠癌生物学行为的评估指标之一．     

Fas/FasL的表达与关节软骨

骨关节病 (ｏｓｔｅｏａｒｔｈｒｉｔｉｓ ,ＯＡ)是活动关节的一种慢性、进行性疾病 ,以关节软骨基质崩解、减少为主要特征 ,研究表明软骨细胞凋亡与ＯＡ进程密切相关 ,而Ｆａｓ在ＯＡ的发展过程中起着重要的作用。1　Ｆａｓ/ＦａｓＬ的基本结构ＡＰＯ 1/Ｆａｓ基因位于 10号染色体长臂 ,由 9个外显子和 8个内含子组成。Ｆａｓ(ＡＰＯ 1,ＣＤ95 )蛋白是一种含有 319个氨基酸的Ｉ型跨膜蛋白 ,相对分子质量为 4 0× 10 4,在结构上与ＴＮＦ、ＮＧＦ相似 ,属于ＴＮＦ受体 (ＴＮＦＲ)超家族。Ｆａｓ分子贯穿于细胞膜 ,且分为膜外区(15 7ＡＡ ,含…     

FasL基因表达对缺氧状态下直肠癌细胞增殖凋亡的影响

Objective To elucidate the effect of FasL gene expression on the proliferation and apoptosis of hypoxic rectal carcinoma cells. Methods The normoxic expression level of FasL in HR-8348 subtype cells (HR-8348B, HR-8348L, HR-8348F and HR-8348As) with different invasive power were verified by Western blot. Hypoxia models for HR-8348B, HR-8348L, HR-8348F and HR-8348As were constructed with chemical modeling, then the FasL levels in all groups at 12 h after hypoxia were quantitated by Western blot. Distribution of different cell life cycles was determined with flow cytometry. Cell reproductive activities were detected with MTT method, and cell apoptesis was assessed with TUNEL. Results FasL protein was pigmentized at the position of 40 000 by Western blot, and the expression level of FasL was significantly higher in HR-8348F cells than those in HR-8348B, HR-8348L and HR-8348As cells(F=361.149, P<0.01) in normoxia. At 12 h after hypoxia, the FasL level was also significantly higher in HR-8348F cells than those in other groups (F=278.766, P<0.01), but was not markedly different as compared to themselves in normoxia (t=1.762, P>0.05). The proliferation index was significantly higher in HR-8348F (60.43±3.72) than those in HR-8348B (40.01±3.30), HR-8348L (41.30±4.06) and HR-8348As cells (35.87±4.39), respectively (F=39.477, P<0.01). However, both inhibition rate of proliferation and apoptotic index were remarkably lower in HR-8348F (17.30±1.98 and 13.10±1.04) than those in HR-834B (33.70±4.33 and 21.60±1.31), HR-8348L (34.20±3.92 and 20.10±1.15), and HR-8348As (38.00±4.55 and 23.90±1.23), respectively (F=28.811 and 76.462, respectively, P<0.01). Conclusion The expression enhancement of intracellular FasL in rectal carcinoma in hypoxia can lead to accelerated proliferation and reduced apeptosis of cells, which will promote tumor cells to adapt microenvironmental hypoxia.     

FasL基因表达对缺氧状态下直肠癌细胞增殖凋亡的影响

Objective To elucidate the effect of FasL gene expression on the proliferation and apoptosis of hypoxic rectal carcinoma cells. Methods The normoxic expression level of FasL in HR-8348 subtype cells (HR-8348B, HR-8348L, HR-8348F and HR-8348As) with different invasive power were verified by Western blot. Hypoxia models for HR-8348B, HR-8348L, HR-8348F and HR-8348As were constructed with chemical modeling, then the FasL levels in all groups at 12 h after hypoxia were quantitated by Western blot. Distribution of different cell life cycles was determined with flow cytometry. Cell reproductive activities were detected with MTT method, and cell apoptesis was assessed with TUNEL. Results FasL protein was pigmentized at the position of 40 000 by Western blot, and the expression level of FasL was significantly higher in HR-8348F cells than those in HR-8348B, HR-8348L and HR-8348As cells(F=361.149, P<0.01) in normoxia. At 12 h after hypoxia, the FasL level was also significantly higher in HR-8348F cells than those in other groups (F=278.766, P<0.01), but was not markedly different as compared to themselves in normoxia (t=1.762, P>0.05). The proliferation index was significantly higher in HR-8348F (60.43±3.72) than those in HR-8348B (40.01±3.30), HR-8348L (41.30±4.06) and HR-8348As cells (35.87±4.39), respectively (F=39.477, P<0.01). However, both inhibition rate of proliferation and apoptotic index were remarkably lower in HR-8348F (17.30±1.98 and 13.10±1.04) than those in HR-834B (33.70±4.33 and 21.60±1.31), HR-8348L (34.20±3.92 and 20.10±1.15), and HR-8348As (38.00±4.55 and 23.90±1.23), respectively (F=28.811 and 76.462, respectively, P<0.01). Conclusion The expression enhancement of intracellular FasL in rectal carcinoma in hypoxia can lead to accelerated proliferation and reduced apeptosis of cells, which will promote tumor cells to adapt microenvironmental hypoxia.     

FasL基因表达对缺氧状态下直肠癌细胞增殖凋亡的影响

Objective To elucidate the effect of FasL gene expression on the proliferation and apoptosis of hypoxic rectal carcinoma cells. Methods The normoxic expression level of FasL in HR-8348 subtype cells (HR-8348B, HR-8348L, HR-8348F and HR-8348As) with different invasive power were verified by Western blot. Hypoxia models for HR-8348B, HR-8348L, HR-8348F and HR-8348As were constructed with chemical modeling, then the FasL levels in all groups at 12 h after hypoxia were quantitated by Western blot. Distribution of different cell life cycles was determined with flow cytometry. Cell reproductive activities were detected with MTT method, and cell apoptesis was assessed with TUNEL. Results FasL protein was pigmentized at the position of 40 000 by Western blot, and the expression level of FasL was significantly higher in HR-8348F cells than those in HR-8348B, HR-8348L and HR-8348As cells(F=361.149, P<0.01) in normoxia. At 12 h after hypoxia, the FasL level was also significantly higher in HR-8348F cells than those in other groups (F=278.766, P<0.01), but was not markedly different as compared to themselves in normoxia (t=1.762, P>0.05). The proliferation index was significantly higher in HR-8348F (60.43±3.72) than those in HR-8348B (40.01±3.30), HR-8348L (41.30±4.06) and HR-8348As cells (35.87±4.39), respectively (F=39.477, P<0.01). However, both inhibition rate of proliferation and apoptotic index were remarkably lower in HR-8348F (17.30±1.98 and 13.10±1.04) than those in HR-834B (33.70±4.33 and 21.60±1.31), HR-8348L (34.20±3.92 and 20.10±1.15), and HR-8348As (38.00±4.55 and 23.90±1.23), respectively (F=28.811 and 76.462, respectively, P<0.01). Conclusion The expression enhancement of intracellular FasL in rectal carcinoma in hypoxia can lead to accelerated proliferation and reduced apeptosis of cells, which will promote tumor cells to adapt microenvironmental hypoxia.     

FasL基因表达对缺氧状态下直肠癌细胞增殖凋亡的影响

Objective To elucidate the effect of FasL gene expression on the proliferation and apoptosis of hypoxic rectal carcinoma cells. Methods The normoxic expression level of FasL in HR-8348 subtype cells (HR-8348B, HR-8348L, HR-8348F and HR-8348As) with different invasive power were verified by Western blot. Hypoxia models for HR-8348B, HR-8348L, HR-8348F and HR-8348As were constructed with chemical modeling, then the FasL levels in all groups at 12 h after hypoxia were quantitated by Western blot. Distribution of different cell life cycles was determined with flow cytometry. Cell reproductive activities were detected with MTT method, and cell apoptesis was assessed with TUNEL. Results FasL protein was pigmentized at the position of 40 000 by Western blot, and the expression level of FasL was significantly higher in HR-8348F cells than those in HR-8348B, HR-8348L and HR-8348As cells(F=361.149, P<0.01) in normoxia. At 12 h after hypoxia, the FasL level was also significantly higher in HR-8348F cells than those in other groups (F=278.766, P<0.01), but was not markedly different as compared to themselves in normoxia (t=1.762, P>0.05). The proliferation index was significantly higher in HR-8348F (60.43±3.72) than those in HR-8348B (40.01±3.30), HR-8348L (41.30±4.06) and HR-8348As cells (35.87±4.39), respectively (F=39.477, P<0.01). However, both inhibition rate of proliferation and apoptotic index were remarkably lower in HR-8348F (17.30±1.98 and 13.10±1.04) than those in HR-834B (33.70±4.33 and 21.60±1.31), HR-8348L (34.20±3.92 and 20.10±1.15), and HR-8348As (38.00±4.55 and 23.90±1.23), respectively (F=28.811 and 76.462, respectively, P<0.01). Conclusion The expression enhancement of intracellular FasL in rectal carcinoma in hypoxia can lead to accelerated proliferation and reduced apeptosis of cells, which will promote tumor cells to adapt microenvironmental hypoxia.     

FasL基因表达对缺氧状态下直肠癌细胞增殖凋亡的影响

Objective To elucidate the effect of FasL gene expression on the proliferation and apoptosis of hypoxic rectal carcinoma cells. Methods The normoxic expression level of FasL in HR-8348 subtype cells (HR-8348B, HR-8348L, HR-8348F and HR-8348As) with different invasive power were verified by Western blot. Hypoxia models for HR-8348B, HR-8348L, HR-8348F and HR-8348As were constructed with chemical modeling, then the FasL levels in all groups at 12 h after hypoxia were quantitated by Western blot. Distribution of different cell life cycles was determined with flow cytometry. Cell reproductive activities were detected with MTT method, and cell apoptesis was assessed with TUNEL. Results FasL protein was pigmentized at the position of 40 000 by Western blot, and the expression level of FasL was significantly higher in HR-8348F cells than those in HR-8348B, HR-8348L and HR-8348As cells(F=361.149, P<0.01) in normoxia. At 12 h after hypoxia, the FasL level was also significantly higher in HR-8348F cells than those in other groups (F=278.766, P<0.01), but was not markedly different as compared to themselves in normoxia (t=1.762, P>0.05). The proliferation index was significantly higher in HR-8348F (60.43±3.72) than those in HR-8348B (40.01±3.30), HR-8348L (41.30±4.06) and HR-8348As cells (35.87±4.39), respectively (F=39.477, P<0.01). However, both inhibition rate of proliferation and apoptotic index were remarkably lower in HR-8348F (17.30±1.98 and 13.10±1.04) than those in HR-834B (33.70±4.33 and 21.60±1.31), HR-8348L (34.20±3.92 and 20.10±1.15), and HR-8348As (38.00±4.55 and 23.90±1.23), respectively (F=28.811 and 76.462, respectively, P<0.01). Conclusion The expression enhancement of intracellular FasL in rectal carcinoma in hypoxia can lead to accelerated proliferation and reduced apeptosis of cells, which will promote tumor cells to adapt microenvironmental hypoxia.