Relationship between Fas/ FasL expression and apoptosis of colon adenocarcinoma cell lines

system hasmediator of aPoPtosisbeen identified asain tumor eells[l一4」.keyTheoeeurrenee and develoPment of neoPlasm are eloselyrelated to apoptosis[5一7〕.Most     

Value of selective chemoembolization in treatment of hepatic metastases in colorectal carcinoma

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｌｉｖｅｒｉｓｔｈｅｍｏｓｔｃｏｍｍｏｎｓｉｔｅｏｆｍｅｔａｓｔａｔｉｃｄｉｓｅａｓｅｉｎｌａｒｇｅｉｎｔｅｓｔｉｎａｌｃａｒｃｉｎｏｍａ，ａｎｄｈｅｐａｔｉｃｉｎｖｏｌｖｅｍｅｎｔｄｅｔｅｒｍｉｎｅｓｔｈｅｓｕｒｖｉｖ...     

干扰素联用药物对胃癌细胞的抑制作用

目的研究不同剂量、不同的用药顺序等配伍方式，探讨干扰素与化疗药物体外联合应用，对人胃癌细胞株的抑制作用．方法以人胃癌细胞株ＦＧＣ８５作为靶细胞，用肿瘤细胞集落形成法进行药敏实验．分析了干扰素α２ｂ（ＩＦＮα２ｂ）与氟脲嘧啶、顺铂联合应用时，不同的配伍方式对人胃癌细胞株增殖的抑制作用．实验分组为：①化疗药物；②ＩＦＮα２ｂ；③化疗药物和ＩＦＮα２ｂ同时作用；④化疗药物继以ＩＦＮα２ｂ；⑤ＩＦＮα２ｂ继以化疗药物．结果ＩＦＮα２ｂ与氟脲嘧啶或顺铂联合应用对ＦＧＣ８５细胞增殖的抑制作用明显强于各单独应用，各组抑制率之间均有显著差异（Ｐ＜００１）；ＩＦＮα２ｂ降低氟脲嘧啶、顺铂的ＩＣ５０，并且有显著差异（Ｐ＜００５，Ｐ＜００１）；加药顺序不同，抑制效果亦不同，以化疗药物继以ＩＦＮα２ｂ组最佳，ＩＦＮα２ｂ继以药物组最差，二者间有显著差异（Ｐ＜００１）．结论ＩＦＮα２ｂ与氟脲嘧啶、顺铂联合应用，可提高药物的抑瘤作用．     

Fas/FasL系统表达与结直肠癌的研究进展

细胞凋亡是指在一定生理和病理情况下,机体为维护内环境的稳定而发生的主动性细胞死亡过程,即程序性死亡.由死亡受体与其配体相互作用是引起细胞凋亡的主要途径之一,其中Fas/FasL系统是被认为最主要的介导细胞凋亡的信号转导途径.大肠癌是严重威胁人类健康的常见恶性肿瘤之一,大肠癌的发生、发展与细胞凋亡的调节失衡有关.本文就Fas/ FasL系统表达与结直肠癌发生发展的关系及相关方面研究作一综述.     

胃癌和癌旁组织中Fas抗原表达与细胞凋亡的关系

目的研究胃癌及癌旁组织中Ｆａｓ抗原表达与细胞凋亡的关系，探讨Ｆａｓ抗原及细胞凋亡在胃癌发病中的作用．方法采用免疫组织化学及脱氧核糖核酸末端转移酶介导的缺口末端标记（ＴＵＮＥＬ）技术对胃癌组织５０例及癌旁组织３３例中Ｆａｓ抗原表达状态及凋亡细胞进行原位观察和比较．结果胃癌组织Ｆａｓ抗原表达率为４６０％，显著低于癌旁组织的７５８％（χ２＝７２２，Ｐ＜００１）．胃癌组织凋亡细胞指数为５８％，显著低于癌旁组织的１６８％（ｔ＝８６３，Ｐ＜００１）；Ｆａｓ抗原表达阳性的胃癌和癌旁组织凋亡细胞指数显著高于Ｆａｓ抗原阴性组（ｔ＝５１６和ｔ＝３７１，Ｐ＜００１）．结论Ｆａｓ抗原对胃癌及癌旁组织中的细胞凋亡具有促进性调控作用，细胞凋亡调控异常在胃癌发病中可能起重要作用．     

Fas/FasL系统与心肌细胞凋亡

心肌细胞凋亡是许多心血管疾病发生发展的重要机制。Fas／FasL系统作为细胞凋亡的信号传导系统也参与了心肌细胞凋亡。当表达Fas的靶细胞和活性细胞的FasL交联后，启动Fas／FasL死亡信号传导系统，分别激活神经鞘磷脂途径蛋白酶途径和DAxx途径而引起Fas表达阳性的靶细胞凋亡。大量研究表明，Fas／FasL系统参与了急性心肌梗塞、病毒性心肌炎、扩张型心肌病、风湿性心脏病、心律失常、心脏移植排斥反应和心力衰竭等心肌细胞凋亡。因此对Fas／FasL系统某一环节的干预为心血管疾病的防治开辟一个新的涂释。     

Study of inhibit the proliferation and induce apoptosis of human colonadenocarcinoma cell line HCT

AIM To explore the anti-tumor effect of indomethacin (IN) on human colon adenocarcinoma cells anddetermine the influence of indomethacin on cancer cell proliferation and apoptosis and elucidate the anti-tumor mechanism of Indomethacin.METHODS Human colon adenocarcinoma HCT116 cell line were cultured separately in vitro. Indomethacin(final concentration 100 μm - 800 gm) was administered alone or altogether with 5-Fu (50 μm). Agarose gelelectrophoresis, MTT, and Flow cytometry were used to study cell proliferation and apoptosis in humancolon carcinoma cell RT-PCR, western blot were used to detect the expression level of Bcl-2, bax gene andcdk4 protein expression in HCT116 cell lines after treated with IN for 24 hours.RESULTS Indomethacin can inhibit significantly the proliferation of HCT116 cell, change the morphology,and cause the cells to accumulate in the G0/Gl phase of the cell cycle, and induce apoptosis. The apoptosis oftumor cells was confirmed by DNA ladder formation on gel electrophoresis and sub-Gl peak on flowcytometry. These responses were time-and concentration-dependent. A synergic effect of inhibiting cancercell proliferation was observed when combined with Indomethacin and 5-Fu. RT-PCR results showed that INdown-regulated Bcl-2 mRNA expression, and did not change Bax mRNA expression. Western blot resultsconfirmed that IN inhibited Bcl-2 protein expression. No influence was found in the translation of Baxprotein. In inhibited cdk4 protein expression.CONCLUSION Our study results indicate that IN induce apoptosis of HCT116 cell by down-regulating Bcl-2expression and inhibiting cdk4 protein expression partially. This explains the mechanisms of antitumoractivity of the Indomethacin.     

Relationship between HBxAg and Fas/FasL in patients with hepatocellularcarcinoma

AIM To assess the relationship between HBV X-gene, X-gene product and Fas/ FasL which mediatehepatocellular apoptosis in patients with hepatocellular carcinoma.METHODS Tissue from 34 patients with hepatocellular carcinoma was tested for the expression of HBxAg.Quantitative ELISA assay was used to detect sFas; and sFasL and PCR were used to detect the HBV X-genein sera from 30 patients with hepatocellular carcinoma, 32 patients with liver cirrhosis and 20 normalcontrols.RESULTS The positive expression of HBxAg, Fas and FasL in carcinoma tissue was 97.06%, 85.29% and100%, respectively. The positive signal was mainly presented in the plasma, and all of these three positivestaining may appear in the same area. Redit analysis showed that there was no significant difference amongthese three positive staining (P >0.05). The mean levels of sFas in sera from hepatocellular carcinoma, livercirrhosis and normal controls were 722.97±321.12, 801.90±419.94 and 224.07±148.23, respectively,showing that sFas levels in patients with hepatocellular carcinoma and liver cirrhosis were significantlyelevated than that in normal controls (P < 0.0l). The mean levels of sFasL in sera from hepatocellularcarcinoma, liver cirrhosis and normal controls were 152.27±7.99, 162.97±12.40 and 154.99 ± 6.96,showing that sFasL level in patients with liver cirrhosis was significantly higher than that in patients withhepatocellular carcinoma and normal controls (P< 0.01). HBV X-gene was found to be positive in sera of30% patients with hepatocellular carcinoma; HBV X-gene was found to be positive in sera of 43.75% ofpatients with liver cirrhosis. There was no significant difference in sFas/sFasL level between HBV X-genepositive patients and HBV X-gene negative patients (P >0.05).CONCLUSION The expression of HBxAg and Fas/FasL in the tissue of hepatocellular carcinoma seemed tobe almost the same, but relation between cause and effect is unclear. The detection of sFas and sFasL inpatient sera may reflect the state of apoptosis mediated by Fas/FasL system. Our data showed that HBV X-gene expression in sera seemed to have no relation to sFas/sFasL level; however, these data also suggestedthat some patients with negative HBsAg in sera might have integrated HBV X-gene in liver tissues, andtherefore X-gene is detectable in those patient sera.     

Function of apoptosis and expression of the proteins Bcl-2, p53 and C-myc in the development of gastric cancer

INTRODUCTION In China ,the incidence and mortality of gastric cancer rank the second among all cancers. Recent development of cancer [1-20].The aim of this study was investigat the insight of apoptosis and bcl-2, p53 and C-myc protein expression in the development of gastric cancer .     

5-氟脲嘧啶腹腔化疗预防裸鼠人结肠癌细胞肝转移研究

目的探索预防大肠癌根治术后肝转移局部区域性辅助化疗新途径.方法利用裸鼠人结肠癌细胞肝转移模型观察术后早期大剂量大容积5-氟脲嘧啶腹腔化疗预防裸鼠经睥接种的人结肠癌细胞肝转移的疗效.结果术后早期5-氟脲嘧啶40 mg/生理盐水40 ml/kg,1次/d,连续2 d 的腹腔化疗可使裸鼠肝转移发生率降低40%,平均每只裸鼠肝转移瘤数目减少50.89%,平均每只裸鼠生存时间延长48.21%.结论腹腔化疗是一个预防大肠癌根治术后肝转移有效的辅助化疗新途径.     

顺铂诱导人胃癌SGC-7901细胞

目的探讨顺铂对胃癌（ＳＧＣ７９０１）细胞凋亡的诱导作用，以揭示顺铂治疗胃癌的作用机制．方法选用不同剂量顺铂与人胃癌细胞系ＳＧＣ７９０１共同孵育不同时间后，应用光镜、电镜进行细胞形态学观察；细胞ＤＮＡ经特异性荧光染色后，用流式细胞仪分析细胞周期变化．结果细胞经顺铂处理后浓缩、深染、致密的染色质沿核膜下凝集、有凋亡小体形成．细胞周期分析Ｇ１期峰前出现典型的细胞凋亡峰，以２５ｍｇ／Ｌ顺铂作用２４ｈ，５０ｍｇ／Ｌ作用１６ｈ为例，定量分析凋亡细胞发生率分别为９３％和１４９％．结论顺铂可通过诱导人胃癌细胞系ＳＧＣ７９０１发生细胞凋亡达到消灭肿瘤细胞的目的．     

Prevention of liver metastasis by intraperitoneal 5-FU chemotherapy in nude mice inoculated with human colon cancer cells

AIM: To prevent hepatic metastasis by regional adjuvant chemotherapy after radical surgery for colon cancer. METHODS: A nude mouse model of human colon cancer (HCC) was used to evaluate the prevention of metastasis of HCC cells following the application of early postoperative intraperitoneal (IP) high-dose 5-fluorouracil chemotherapy. RESULTS: The incidence of liver metastasis was decreased by 40%, and the mean number of metastatic liver nodules was reduced by 50.89%. Compared with controls, 5-FU 40 mg in NS 40 mL/kg IP for 2 consecutive days prolonged mean survival by 48.21%. CONCLUSION: IP is a promising and effective novel regional adjuvant chemotherapy for the prevention of liver metastasis of HCC cells after radical surgery for colon cancer.     

中量醛氢叶酸和5－FU联合治疗胃肠道肿瘤

目的探讨生化调制剂醛氢叶酸（ＣＦ）和氟脲嘧啶联合应用治疗胃肠道肿瘤的效果。方法采用ＣＦ＋５＿ＦＵ＋ＤＤＰ或／和ＭＭＣ联合方案。ＣＦ用中剂量２００－３００ｍｇ／（ｍ２·ｄ）静脉滴注，２ｈ后接着用５－ＦＵ３７５ｍｇ／（ｍ２·ｄ）静脉滴注ＤＤＰ２０ｍｇ／（ｍ２·ｄ）静脉推注，以上药物连用５ｄ，ＭＭＣ６－８ｍｇ于化疗第１天静脉推注。结果３２例可评价的胃癌有效率（ＣＲ＋ＰＲ）为６２５％，治疗有效病例，治疗后生存３－１４个月，仍在继续观察中。３６例可评价的结直肠癌有效率为４１７％，有效病例中位生存期１３个月，无效病例８个月。毒副反应以骨髓抑制和消化道反应为主。结论本方案对晚期胃肠道肿瘤是一种疗效比较好的化疗方案，毒副反应可以忍受，值得推广。     

经纤支镜冷基循环微波聚能刀治疗中心型肺癌的有效性和安全性评价

目的探讨经纤支镜冷基循环微波聚能刀治疗中心型肺癌的安全性和有效性。方法使用针式单极微波辐射天线、CT引导下经皮肺穿刺周围型肺癌、以2450MHz的微波,依据肿瘤大小以40～80w的微波辐射治疗5～20min,对45例患者的68个病灶进行治疗。选择中央型肺癌患者90例,均有肺不张和呼吸困难,分为微波联合化疗组（治疗组）和单纯化疗组（对照组）,观察患者症状的改善及胸部X线片和CT的变化,同时测定患者血液中自然杀伤细胞（NK细胞）的活性及淋巴细胞转化率,两组相比,疗效有极显著性差异（P〈0．01）。结果治疗组所有患者症状减轻,其中35例完全复张,8例部分复张,2例无效。同时血液中NK细胞活性增加（P〈O．01）。对照组仅8例部分复张,NK细胞活性降低,两组相比,疗效有极显著性差异（P〈0．01）。结论小于65W15s微波凝固治疗中央型肺癌是安全有效的,可显著减轻气道阻塞症状,并提高患者免疫力。     

丁型肝炎患者肝组织中Fas/FasL和肝细胞凋亡表达

目的探讨Fas/FasL及肝细胞凋亡在丁型肝炎患者肝组织中的表达及作用.方法采用免疫组化双重染色和TUNEL技术,检测79例丁肝患者肝组织HDAg,Fas/FasL表达,以及肝细胞凋亡,以54例乙型肝炎作对照.结果Fas以肝细胞浆表达为主,HDAg以核浆型表达为主,二抗原表达及分布有相关性.FasL主要表达在浸润淋巴细胞浆、肝细胞核,与HDAg表达及分布不全一致.HDAg,Fas/FasL和肝细胞凋亡在各型肝炎中的表达强度有显著性差别意义.结论HDV感染可诱导肝细胞Fas/FasL表达,增强Fas/FasL途径介导的肝细胞凋亡,这一机制在丁型肝炎发病机制中可能有一定的重要作用.