THE MUTAGENICITY OF DRUGS AND THEIR EFFECT ON DNA CIRCULAR DICHROISM

Circular dichroism (CD) is a reliable,sensitiveand convenient methods for analysing the effectof drugs on DNA,which intercalated into theDNA molecule or formed DNA complex and couldchange the conformation of DNA and alter theCD spectra.Mutagenicity of 19 drugs were     

THE STUDIES OF REVERSAL ON INHIBITING DNA SYNTHESIS AND CLONAL FORMATION OF HL－60 CELLS WITH HYPERTHERMIA

ＴＨＥＳＴＵＤＩＥＳＯＦＲＥＶＥＲＳＡＬＯＮＩＮＨＩＢＩＴＩＮＧＤＮＡＳＹＮＴＨＥＳＩＳＡＮＤＣＬＯＮＡＬＦＯＲＭＡＴＩＯＮＯＦＨＬ－６０ＣＥＬＬＳＷＩＴＨＨＹＰＥＲＴＨＥＲＭＩＡＣｈｅｎＸｉｅｑｕｎ;ＳｈｅｎＳｕｙｕｎ;ＨｕＳｈｅｎｇｈｕｉ;ＷｕＢ...     

EFFECT OF BUNGARUS MULTICINCTUS CRUDE VENOM AND ITS COMPONENTS ON TUMOR CELLS

Bungarus multicinctus crude venom is a mixture of many kinds of enzyme proteins, non-enzyme proteins and toxic multipeptids, including a-BTX), b-bungarotoxin (b-BTX), k-bungarotoxin (k-BTX), and so on. Many of these components have the apoptosis-inducing effect. All kinds of apoptosis-inducing factors from snake venom have been found, such as a-BTX[1], b-BTX[2], a-BTX-ACHRs[3], L-amino acid oxidase (LAO)[4], Apoxin I[5], vascular apoptosis-inducing protein (VAP)[6], VAP2[7], glycy…     

THE ANTICANCER EFFECT AND ANTI－DNA TOPOISOMERASE II EFFECT OF EXTRACTS OF CAMELLIA PTILOPHYLLA CHANG AND CAMELLIA SINENSIS

ＴＨＥＡＮＴＩＣＡＮＣＥＲＥＦＦＥＣＴＡＮＤＡＮＴＩ－ＤＮＡＴＯＰＯＩＳＯＭＥＲＡＳＥＩＩＥＦＦＥＣＴＯＦＥＸＴＲＡＣＴＳＯＦＣＡＭＥＬＬＩＡＰＴＩＬＯＰＨＹＬＬＡＣＨＡＮＧＡＮＤＣＡＭＥＬＬＩＡＳＩＮＥＮＳＩＳＸｉｅＢｉｎｓｆｅｎ；谢冰芬；ＬｉｕＺ...     

THE ANTITUMOR ACTIVITY OF LYMPHOTOXIN AND THE EFFECT OF INTERLEUKIN-2 ON ITS FUNCTION

The effect of lymphotoxin (LT)-containing supernatant produced by lectin-stimulated human lymphocytes on tumor cells and the relation between interleukin-2 (IL-2) and LT were studied in this article. Results showed that LT-containing superna-tants had cytotoxicities on many different kinds of tumor cells from human and mice, that actinomycin D increased the LT activities on target cells and that IL-2 had the ability to increase the cytotoxicity of human PBMC on tumor cells, after being treated with LT, the target cells were more easy to kill by PBMC as well.     

EFFECT OF ASCORBIC ACID ON DNA SYNTHESIS,INTRACELLULAR ACCUMULATION OF ADM AND ADM RESISTANCE OF TUMOR CELL LINES

ＥＦＦＥＣＴＯＦＡＳＣＯＲＢＩＣＡＣＩＤＯＮＤＮＡＳＹＮＴＨＥＳＩＳ，ＩＮＴＲＡＣＥＬＬＵＬＡＲＡＣＣＵＭＵＬＡＴＩＯＮＯＦＡＤＭＡＮＤＡＤＭＲＥＳＩＳＴＡＮＣＥＯＦＴＵＭＯＲＣＥＬＬＬＩＮＥＳＸｉｅＺｕｏｆｕ谢佐福ＬｉｎＸｉａｎｄｏｎｇ林贤东Ｚｈｏ...     

THE EFFECT OF db-cAMP ON THE GENE EXPRESSION OF CALMODULIN AND CYTOSKELETON IN THE TRANSFORMED CELLS

We have demonstrated that the distribution of microtubules (MT), mlcrofilaments (MF) and fibronectin (FN) were diminished, while the gene expression of the calmodulin and c- fos enhanced in the transformed C3H10T1/2 cells. After treatment with 1 mM db-cAMP for 1 hour and 2 hours, there was an early and repldly reduced in gene expression of Calmodulin and c-fos respectively. After db-cAMP treatment for 4 -5 days, the number of capping cells of ConA binding decreased significantly and the cell surface microvllll decreased as well. The growth of treated cells was inhibited markedly. By using 4F1 cDNA probe, which is preferentially expressed In G1 phase, we have found that the db- cAMP treated cells were accumulated at G1 phase. Of particular interest is the fact that the distribution of microtubules, mlcrofilaments and fibronectln were recovered after treatment with 1 mM db-cAMP for 6 days. It is suggested that the Inhibition of proliferation, alteration, of phenotype and reco- very of cytoskeleton is tran     

STUDIES ON THE GAP JUNCTIONAL INTERCELLULARCOMMUNICATION OF HUMAN NASOPHARYNGEALCARCINOMA CELLS AND THE EFFECT OF RII

ＳＴＵＤＩＥＳＯＮＴＨＥＧＡＰＪＵＮＣＴＩＯＮＡＬＩＮＴＥＲＣＥＬＬＵＬＡＲＣＯＭＭＵＮＩＣＡＴＩＯＮＯＦＨＵＭＡＮＮＡＳＯＰＨＡＲＹＮＧＥＡＬＣＡＲＣＩＮＯＭＡ　ＣＥＬＬＳＡＮＤＴＨＥＥＦＦＥＣＴＯＦＲＩＩＨａｎＬｉｑｕｎ韩立群；ＧａｏＪｉｎ高进；...     

STUDY ON THE EFFECT OF DNA REPAIR IN PERIPHERAL LYMPHOCYTES OF DIABETES MELLITUS

The purpose of this study is to check the effect ofDiabetes mellitus on DNA repair of peripheral lympho-cytes.With liquid scintillation counting,the valueof lymphocytes unscheduled ~3H-TdR incorporation in-dex in the aged patients with diabetes mellitus grou-     

COMPARATIVE STUDY ON THE INHIBITORY EFFECT OF GREEN TEA, COFFEE AND LEVAMISOLE ON THE HEPATOCARCINOGENIC ACTION OF DIETHYLNITROSAMINE

The present study aimed at clarifying whether Chinese green tea, coffee and levamisole (LMS) have similar Inhibitory effect on hepatocarclnogenesis induced by diethylnltrosamine (DEN) as they had been proved in our previous aflatoxin B1 (AFB1) experiments. Male Wistar rates were divided into control (A), green tea (B), coffee (C) and levamisole (D) groups. All rats received the same basic DEN treatment according to the program originally designed by Solt and Farber. During the two weeks before and one week after i. p. injection of DEN, the group B, C and D were given 2. 5% green tea, 5% coffee and 0. 1% LMS diet, respectively. The results demonstrated that coffee, LMS and , in particular,green tea showed Inhibitory effect against DEN-induced hepatocarcinogenesis, indicating that green tea can be used as chemopreventive agent for DEN-, as well as for AFB1-induced hepatocarcinogenesis.     

OBSERVATION OF THE EFFECTS OF LAK／IL－2 THERAPY COMBINIGN WITH LYCIUM BARBARUM POLYSACCHARIDES IN THE TREATMENT OF PATIENTS WI

曹广文，杨文国，杜平，王雄彪ＯＢＳＥＲＶＡＴＩＯＮＯＦＴＨＥＥＦＦＥＣＴＳＯＦＬＡＫ／ＩＬ－２ＴＨＥＲＡＰＹＣＯＭＢＩＮＩＧＮＷＩＴＨＬＹＣＩＵＭＢＡＲＢＡＲＵＭＰＯＬＹＳＡＣＣＨＡＲＩＤＥＳＩＮＴＨＥＴＲＥＡＴＭＥＮＴＯＦＰＡＴＩＥＮＴＳＷＩＴＨＡ...     

枸杞原汁、枸杞多糖诱导人正常肝细胞L-O2及卵巢癌细胞株SKOV3、HO8910凋亡的实验研究

目的:对比研究枸杞原汁、枸杞多糖对人正常肝细胞L-O2及人卵巢癌细胞株SKOV3、HO8910的生长抑制,及诱导凋亡的作用及其机制。方法:枸杞原汁、枸杞多糖作用L-O2、SKOV3、HO8910,用MTT法检测细胞生长抑制率,流式细胞仪检测细胞凋亡率并分析细胞周期分布的变化。结果:枸杞原汁组:L-O2、SKOV3、HO8910生长抑制率分别为-58%,-49%,-84%;L-O2、HO8910凋亡细胞含量明显少于空白对照组,正常细胞数明显多于空白对照组;枸杞原汁对L-O2、HO8910无细胞周期阻滞,各期细胞分别较对照组均匀;枸杞多糖组:枸杞多糖(500,1000,2000)mg/L作用下,L-O2生长抑制率分别为28%,31%,20%;SK-OV3为-1%,40%,35%,HO8910为13%,48%,41%;不同浓度LBP对L-O2及HO8910均有诱导凋亡作用,凋亡细胞数以1000mg/L为最大;1000mg/L组L-O2、HO8910细胞周期均阻滞于S期,S期细胞比例高于对照组。结论:枸杞原汁在体外对L-O2、SKOV3、HO8910有促进生长作用,且对HO8910的作用最大;对L-O2、HO8910无诱导细胞凋亡作用。枸杞多糖在体外对L-O2、SKOV3、HO8910都有抑制生长作用,且对HO8910作用最大;对L-O2、HO8910有诱导细胞凋亡作用,以浓度1000mg/L为最大,并未表现出剂量依赖效应。枸杞多糖诱导细胞发生S期阻滞,并且诱导S期细胞发生凋亡是其体外抑制细胞生长的可能机制之一。     

S100A14, a mediator of epithelial-mesenchymal transition,regulates proliferation,migration and invasion of human cervical cancer cells

S100A14 is an EF-hand calcium-binding protein that has been reported to exert its biological effects on different types of cells. However, the potential clinical significance and biological functions of S100A14 in cervical cancer has not yet been clarified. In this study, we firstly examined the correlation between S100A14 expression and clinical-pathological parameters in cervical cancers. Next, we observed the effect of S100A14 on cell cycle progression, cell proliferation, migration and invasion by employing lentiviral-mediated overexpression and knockdown of S100A14 in cervical cancer cells. Furthermore, we investigated the underlying mechanism of S100A14 affecting cell migration and invasion. Immunohistochemistry analysis demonstrated that S100A14 expression was associated with the International Federation of Gynecology and Obstetrics (FIGO) stage (P = 0.025) and lymph node (LN) metastasis (P = 0.001). Functional assays showed that S100A14 overexpression increased the proportion of G2/M phase, promoted cell proliferation, migration, and invasion, whereas S100A14 knockdown exhibited adverse effect on above properties. Mechanistic investigation demonstrated that S100A14 can act as a mediator of epithelial-mesenchymal transition (EMT). And overexpression of S100A14 increased expression of N-cadherin and Vimentin while decreased expression of E-cadherin. The opposite results were observed in S100A14-silenced cells. Taken together, our data indicate that S100A14 has a crucial role in cervical cancer progression. This study significantly increases our understanding of S100A14 functional roles in cervical cancer, which may lead to the development of a novel therapeutic target for cervical cancer.     

癌性腹水对卵巢癌细胞增殖及迁移的影响

目的 探讨癌性腹水对卵巢癌腹水中肿瘤细胞和卵巢癌细胞系(SKOV3)的形态学特征、增殖和迁移能力的影响。方法 卵巢癌腹水中提取的肿瘤细胞在体外用DMEM高糖培养液培养;卵巢癌细胞系(SKOV3)分别用DMEM高糖培养液和DMEM高糖培养液中加入不同比例癌性腹水制成的混合培养液培养;分别通过光学显微镜和电子显微镜观察各组细胞的形态学特点;用CCK试剂盒检测各组细胞的增殖能力;用划痕实验检测癌性腹水对卵巢癌细胞系SKOV3迁移能力的影响。结果 卵巢癌腹水中肿瘤细胞与卵巢癌细胞系(SKOV3)形态学特征明显不同;腹水中的肿瘤细胞离开腹水微环境后增殖能力明显减弱;混合培养液培养的SKOV3肿瘤细胞比DMEM高糖培养液培养的SKOV3肿瘤细胞的增殖及迁移能力明显增强。结论 卵巢癌腹水中的肿瘤细胞发生了更有利于其增殖及迁移的形态学改变;癌性腹水对卵巢癌细胞系(SKOV3)的增殖及迁移具有促进作用。     

负载肿瘤干细胞膜微粒的DC-CIK/CTL细胞协同西妥昔单抗对结直肠癌细胞的杀伤作用及其机制

目的:探讨负载结直肠癌干细胞膜微粒(membrane microparticles,MMPs)DC-CIK与西妥昔单抗(Cetuximab,C225)对EGFR靶向药耐药结直肠癌细胞的靶向协同杀伤作用及其机制.方法:PCR法检测结直肠癌SW480、SW620、HCT1 16株细胞k-RAS突变状态,无血清悬浮细胞培养法富集SW480、HCT116肿瘤干细胞,RT-PCR检测干细胞标志物Sox-2和Oct-4.提取外周血单个核细胞培养DC与CIK,将结直肠癌干细胞MMPs负载DC后再与CIK共孵育.形态观察及MTT法分别检测DC-CIK/CTL细胞及其培养上清、C225单独和合并处理对SW480、SW620、HCT116及其干细胞的杀伤效应;RT-PCR检测DC-CIK/CTL细胞培养上清、C225单独和合并作用对SW480、SW620、HCT116细胞凋亡相关基因Fas和上皮细胞间质转化(epithelial-mesenchymal transition,EMT)相关E-钙黏蛋白和波形蛋白基因的表达,划痕实验测定DC-CIK/CTL细胞培养上清、C225单独及联合作用对结直肠癌细胞侵袭行为影响.结果:SW480、SW620和HCT116细胞均为k-RAS突变型;富集培养获得的结直肠癌干细胞样细胞高表达Sox-2和Oct-4 mRNA.MMPs负载DC-CIK/CTL细胞及其分泌上清与C225对结直肠癌细胞的抑制有协同作用.C225与MMPs负载DC-CIK/CTL上清联合组相对于两者单独作用组能提高Fas与E-钙黏蛋白基因的表达;联合组的迁移率比两者单独作用组小.结论:负载结直肠癌干细胞MMPs的DC-CIK/CTL细胞对EGFR靶向药耐药结直肠癌细胞有体外特异靶向杀伤效应,且与C225显著协同,其发生机制与逆转细胞EMT和诱导细胞凋亡有关.     

CD14稳定沉默胃癌细胞系的建立及其侵袭能力研究

背景与目的：白细胞分化抗原14(cluster of differentiation antigen 14,CD14)为脂多糖(lipopolysaccharide,LPS)的高亲和受体,能够识别革兰阴性菌、真菌以及结核杆菌并介导机体的炎性反应,为病菌引发多种细胞信号转导的第一步,在肿瘤组织以及癌细胞中常呈异常表达。近来有研究指出,CD14启动子区的功能性突变能够影响CD14的表达,并增加幽门螺杆菌感染后罹患胃癌的风险,据此推测CD14与胃癌的发生、发展密切相关。本研究拟构建CD14-shRNA干扰载体,建立CD14稳定沉默的胃癌细胞系,初步探讨CD14对胃癌细胞侵袭能力的影响,以期为胃癌发病机制的研究奠定实验基础。方法：根据shRNA引物设计原则设计并合成4条CD14-shRNA序列,构建sh-CD14表达载体,转染MGC-803细胞,G418筛选稳转细胞系;RT-PCR检测CD14 mRNA的表达;蛋白质印迹法(Western blot)检测CD14蛋白的表达;Transwell小室模型检测细胞的侵袭能力。结果：测序结果表明,CD14-shRNA表达载体构建成功并筛选得到了CD14稳定沉默的胃癌细胞系,其CD14 mRNA以及蛋白的表达分别降低了71.7%%和63.4%;与对照组相比CD14-shRNA组细胞侵袭能力显著降低,差异有显著统计学意义(P<0.01)。结论：成功构建了CD14-shRNA干扰载体并获得了CD14稳定沉默的胃癌细胞系,初步证实CD14的沉默能够影响胃癌细胞的侵袭能力。     

左旋棉酚对裸鼠人前列腺癌PC-3细胞皮下移植瘤的生长抑制作用

目的:探讨左旋棉酚对裸鼠人前列腺癌PC-3细胞皮下移植瘤的生长抑制作用及其机制.方法:建立裸鼠人前列腺癌PC-3细胞皮下移植瘤模型,将移植瘤裸鼠80只随机分成4组,每组20只,分别为10.0mg/kg、5.0mg/kg、2.5ng/kg左旋棉酚治疗组和对照组,进行疗效分析与组织病理形态学观察,同时检测肿瘤组织内PCNA、bcl-2、caspase-3和caspase-8的表达.结果:左旋棉酚可使人前列腺癌PC-3细胞荷瘤裸鼠存活率提高,肿瘤体积缩小,肿瘤组织坏死明显,PCNA与bcl-2表达减少,caspase-3和caspase-8表达增加,但高剂量左旋棉酚对PC-3荷瘤裸鼠肝脏和肠道有一定毒性.结论:当治疗剂量大于5.0mg/kg时,左旋棉酚可通过增殖抑制和诱导凋亡,明显抑制裸鼠人前列腺癌PC-3细胞皮下移植瘤的生长.     

Liposome encapsulated curcumin-difluorinated (CDF) inhibits the growth of cisplatin resistant head and neck cancer stem cells

Head and neck squamous cell carcinoma (HNSCC) is the sixth most common cancer, with 600,000 new cases every year worldwide. Although chemotherapeutics exist, five-year survival is only 50%. New strategies to overcome drug resistance are required to improve HNSCC treatment. Curcumin-difluorinated (CDF), a synthetic analog of curcumin, was packaged in liposomes and used to evaluate growth inhibition of cisplatin resistant HNSCC cell lines CCL-23R and UM-SCC-1R generated from the parental cell lines CCL-23 and UM-SCC-1 respectively. Growth inhibition in vitro and expression levels of the CD44 (cancer stem cell marker), cytokines, and growth factors were investigated after liposomal CDF treatment. The in vivo growth inhibitory effect of liposomal CDF was evaluated in the nude mice xenograft tumor model of UM-SCC-1R and the inhibition of CD44 was measured. Treatment of the resistant cell lines in vitro with liposomal CDF resulted in a statistically significant growth inhibition (p < 0.05). The nude mice xenograft study showed a statistically significant tumor growth inhibition of UM-SCC-1R cells and a reduction in the expression of CD44 (p < 0.05), indicating an inhibitory effect of liposomal CDF on CSCs. Our results demonstrate that delivery of CDF through liposomes may be an effective method for the treatment of cisplatin resistant HNSCC.     

化疗联合DC-CTL治疗不同分期非小细胞肺癌的疗效分析

目的:分析化疗联合树突状细胞诱导的细胞毒性T淋巴细胞(dendritic cells and cytotoxic lymphocytes,DC-CTL)对非小细胞肺癌(non-small cell lung cancer,NSCLC)患者的疗效及安全性.方法:收集我院2013年5月至2015年12月期间住院病理确诊为Ⅰb(具有高危因素)、Ⅱa、Ⅱb、Ⅲa、Ⅲb、Ⅳ期的NSCLC患者114例,其中接受肺癌根治术的患者分为术后化疗联合DC-CTL组20例和术后化疗组32例,未行手术患者分为化疗联合DC-CTL组23例和化疗组39例.回顾分析了114例患者的临床特点、疾病控制率(disease control rate, DCR)、中位无疾病生存期(median-disease free survival,M-DFS)、中位无进展生存期(median-progression free survival,M-PFS)、副作用等资料.随访截止至2016年11月.结果:1年DCR:术后化疗联合DC-CTL组(75.0%)vs术后化疗组(43.8%)(P=0.044).M-DFS:术后化疗联合DC-CTL组(19.5个月)与术后化疗组(11.5个月)相比,差异具有明显统计学意义(P=0.025 5).化疗联合DC-CTL治疗与化疗组相比,DCR及M-PFS不具有统计学差异.DC-CTL治疗的副作用显著低于化疗.结论:术后化疗联合DC-CTL治疗可显著提高DCR及延缓NSCLC患者的疾病进展,且安全性高.     

(14C-Methyl)-L-methionine uptake in rat brain tumors before and after treatment with the protein synthesis inhibitor cycloheximide

Summary Autoradiographic study of (¹⁴C-methyl)-L-methionine with brain tumor bearing rats aimed at an elucidation of the mechanism of tracer accumulation in the protein synthesis of tumor. Twice as much tracer accumulated in the tumors compared as in the contralateral gray matter (nontumor region) at 90 min post intravenous injection. The protein-bound fraction of the tumors, expressed as acid-insoluble fraction (AIF), was 1.7 ± 0.6 (mean ± standard deviation, n=6), significantly higher than that (0.8 ± 0.2) of the nontumor region (p<0.05 by the Mann-Whitney test). The tumor AIF comprised 82.3 ± 9.2% of the total amount of the tracers accumulated in the tumors. The protein synthesis inhibitor cycloheximide reduced the tracer uptake and the AIF of the tumors to an almost same level as the nontumor region. These findings indicate that metabolic acceleration of protein synthesis may be a main reason for the high accumulation of (¹⁴C-methyl)-L-methionine in tumor.