Expression and significance of PTEN and PCNA in human laryngeal squamous cell carcinoma

TumorsuppressedgenePTEN(phosphotaseandten sionhomologdeletedfromchromsome 10 )wasidentifiedbythreedifferentgroupsin 1997 PTENismutatedinsporad icbrain ,breastandprostatecancer.ThenormalexpressionofPTENcansuppresstumorcellsinvading ,metastasisandgrowth.TheabnormalexpressionofPTENwillresultinPTENproteindecreasingordisappearing .Proliferatingcellnuclearantigen (PCNA )isanauxiliaryproteinofDNApolymerase ,whichisexpressedinG1stageofcellcircle ,getstotheclimaxinSstage ,anddecreasesinG2 -…     

Study on the pathological characteristics of latent carcinoma and incidental carcinoma of the prostate

Objective To study the differential characteristics of morphology,proliferating degree and expression of MMP-2,MMP-9 between latent carcinoma,incidental carcinoma and clinical carcinoma of the prostate.Methods The morphological features were observed by HE staining and the expressions of Ki-67.PCNA,MMP-2,MMP-9 were studied by immunohistochemistry （SP method） in 24 cases of latent carcinomas,5 cases of incidental carcinomas and 38 cases of clinical carcinomas.     

Human papillomavirus, human cytomegalovirus and oncogene C-myc in cervical carcinoma and cervicitis.

HPV-16 and HCMV DNA homologous sequence and the status of cellular oncogene C-myc DNA were examined in uterine cervical diseases with dot blot hybridization and Southern hybridization. The results showed a positive rate of 70.8% in HPV-16 and 38.7% in HCMV in cervical carcinoma, and that of 36.7% in HPV-16 and 16.7% in HCMV in cervicitis. C-myc DNA was widely detectable in uterine cervical carcinoma, but the manifestation of translocation, deletion or overexpression in cervical carcinoma was frequent. The value of these findings in the development of cervical carcinoma is discussed.

     

Studies on morphology and biomechanics of the coronary arteries

Ｓｔｕｄｉｅｓｏｎｍｏｒｐｈｏｌｏｇｙａｎｄｂｉｏｍｅｃｈａｎｉｃｓｏｆｔｈｅ　ｃｏｒｏｎａｒｙａｒｔｅｒｉｅｓＪｉａｎｇＺｏｎｇｌａｉ（姜宗来）（ＤｅｐａｒｔｍｅｎｔｏｆＡｎａｔｏｍｙ，ＳｅｃｏｎｄＭｉｌｉｔａｒｙＭｅｄｉｃａｌＵｎｉｖｅｒｓｉｔｙ...     

Studies on the Effects of Steroid Hormone Contraceptives on Lipid, Lipoprotein and Apolipoprotein Metabolism in Chinese Women

Overthe pastthreedecades,differentadministrations of combinationsof oestrogen and progestogen have played importantroles forcontraception.Although the ef-ficacy of these contraceptives was quite satisfactory,some changes of lipidmetabolism were reported.Published studies put emphasis on high-density lipopro-tein cholesterol( HDL-c) and large-scale epidemiological studies have shown an in-verse correlation between the levels of the HDL-c and the risk of arterial disease.With respectto theeffe…     

Studies on the prevention of noise-induced hearing loss among musicians of traditional Chinese opera

<正> The incidence of hearing impairment in musicians of traditional Chinese opera is higher than that in popular music and rock and roll music. The sound levels of different instruments used in traditional Chinese opera measured acoustically showed drums, gongs and cymbols to be hazardous to the ear. The conventional measures of prevention, such as ear plugs are not acceptable by the musicians because of interference to the musician's hearing acuity. A rearrangement of the seats for the musicians was suggested by the authors, the percussive musicians should seat themselves one meter lower than the other musicians. Animal (guinea pigs) experiments by study of AP in EcochG and ul-trastructural observations of the cochlea have confirmed that our suggestion for prevention of noise -induced hearing impairment to be efficient.     

Detection of human papilloma virus (HPV) in laryngeal carcinoma tissue.

Using alpha-32P-dCTP labelled human papillomavirus type 16 DNA genome probe (cHPV 16 DNA, cloned and identified from a Chinese cervical invasive carcinoma), 3 HPV 16 genomic relative sequences were detected in 6 biopsies of laryngeal carcinoma. The results showed serious HPV infection in laryngeal carcinoma. This indicates that HPV infection may play an important pathogenetic role in cancer development.

     

Studies on the Chemistry of Photocarcinorin

Here presents a report on the preparation,chemical composition andphysico-chemical properties of photocarcinorin(PsD-007),a new drug ofphotolocalization and photochemotherapy for human malignancies.It was shownby the results of thin layer and high performance liquid chromatographic(TLC &HPLC)analyses that about 85% of its total weight are relatively hydrophorbicporphyrins of unknown structure,in which a fraction with the same retention timeas hematoporphyrin(Hp)monoacetate constitutes more over 60%.There are also4.2%,of Hp,8.6% of 3(8)-hydroxyethyl-8(3)-vinyl deuteroporphyrin(HVD)and0.6% of protoporphyrin(Pp)in this drug.The presence and amount of HVD inPsD 007 were determined by an authentic sample prepared by authors.Thechanges of the composition of PsD-007 on exposure to different doses of argonlaser(514.5+488nm)irradiation were detected by HPLC.The variations in Soretpeak of UV absorption spectra of PsD-007 protected from light at a constanttemperature were also determined.     

Studies on the Anti-atherosclerosis Effects of Rhubarb and Salvia Miltiorrhiza

Ｓｔｕｄｉｅｓ　ｏｎ　ｔｈｅ　Ａｎｔｉ－ａｔｈｅｒｏｓｃｌｅｒｏｓｉｓ　Ｅｆｆｅｃｔｓ　ｏｆ　Ｒｈｕｂａｒｂ　ａｎｄ　Ｓａｌｖｉａ　ＭｉｌｔｉｏｒｒｈｉｚａＦａｎＬｅｍｉｎｇ（范乐明）ＪｉａｎｇＣｈｕａｎｇｃｈａｎｇ（姜传昌）ＣｈｅｎＹｕｈｕａ（陈毓...     

c-met在喉鳞状细胞癌中的表达及意义

目的:探讨原癌基因c-met在喉癌组织中的表达及其与喉癌临床病理的相关性。方法:采用免疫组织化学染色方法检测了42例喉癌组织,25例非癌组织(癌旁组织及声带息肉)中c-met蛋白的表达情况。结果:免疫组织化学检测结果显示c-met蛋白在喉癌组织中的阳性表达率为64.3%,显著高于癌旁组织及声带息肉(P<0.05)。c-met蛋白表达与肿瘤的病理分级、临床分期、淋巴结转移有关(P<0.05),而与患者年龄无关(P>0.05)。结论:c-met在喉癌组织中异常高表达,提示在喉癌的发生、发展中可能起重要作用。     

HPV16E7蛋白和Rb 蛋白在人喉鳞状细胞癌中的表达及相关性研究

目的:探讨HPV16E7蛋白和Rb蛋白在人喉鳞状细胞癌(鳞癌)组织中的表达及其在喉鳞癌发生和发展过程中的相互关系.方法:用免疫组织化学方法检测78例喉鳞癌、26例喉癌前病变、24例声带息肉和10例癌周正常喉组织标本中HPV16E7蛋白和Rb蛋白的表达.结果:癌周正常喉组织、声带息肉、喉癌前病变和喉鳞癌组织中HPV16E7蛋白的阳性表达率分别为0(0/10)、4.1%(1/24)、27.0%(7/26)和43.6%(34/78),Rb蛋白的阳性表达率分别为80.0%(8/10)、79.2%(19/24)、61.5%(16/26)和50.0%(39/78);HPV16E7蛋白和Rb蛋白的阳性表达率在癌周正常喉组织、声带息肉与喉鳞癌组之间均有显著性差异(P＜0.05),HPV16E7蛋白表达呈明显升高趋势,而Rb蛋白表达呈明显下降趋势.HPV16E7蛋白的阳性表达率,喉鳞癌病理Ⅲ级明显高于Ⅰ级或Ⅱ级(P＜0.05),临床Ⅲ～Ⅳ期明显高于Ⅰ～Ⅱ期(P＜0.05);而Rb蛋白的表达正相反,肿瘤病理Ⅲ级明显低于Ⅰ级或Ⅱ级(P＜0.05),临床Ⅲ～Ⅳ期明显低于Ⅰ～Ⅱ期(P＜0.05).结论:HPV16E7蛋白的表达升高和Rb蛋白的表达下降可能会导致人喉鳞癌的发生和发展;检测HPV16E7蛋白和Rb蛋白的表达可用于喉鳞癌恶性程度的评定.     

Tumstatin治疗喉鳞癌的实验研究

目的 探讨肿瘤抑素(Tumstatin)对喉鳞癌细胞(Hep-2)的治疗作用.方法 用Hep-2细胞株进行传代培养,台盼蓝法观察Tumstatin和顺铂对不同培养时间细胞的生长抑制情况;MTT法检测不同浓度的Tumstatin对Hep-2细胞存活率的影响,光镜观察细胞形态的变化;电镜和3′-原位末端标记法(TUNEL)检测Hep-2细胞凋亡的发生和形态学改变.结果 ①随着药物对Hep-2细胞作用时间的延长,细胞生存率明显降低,存在时间依赖性;②MTT检测显示,Tumstatin对细胞的增殖的抑制效应具有剂量依赖性;③光镜观察发现,药物作用组细胞出现病变;④电镜和TUNEL染色证实,Tumstatin对Hep-2细胞的抑制作用是以促进细胞凋亡为主.结论 Tumstatin可能通过促进细胞凋亡发挥抗肿瘤的作用.     

miR-21对人喉鳞癌细胞Hep2迁移侵袭能力的影响

目的：探讨微小RNA‐21（miR‐21）对人喉鳞癌细胞Hep2迁移、侵袭能力的影响。方法用脂质体Lipofectami‐neTM2000将miR‐21抑制剂和miR‐21NC转入人喉鳞癌细胞Hep2中,48h后,运用四甲基偶氮唑蓝（MTT）比色法检测细胞活力,划痕实验检测细胞迁移能力,Transwell小室法检测细胞侵袭能力,蛋白质印迹法检测人第10号染色体缺失的磷酸酶及张力蛋白同源的基因（PTEN）／磷脂酰肌醇3激酶（PI3K）／蛋白激酶B（Akt）的激活情况,以及基质金属蛋白酶（MMP）2、MMP9与伴有kazal域的富含半胱氨酸的逆转诱导蛋白（RECK）的表达。结果与miR‐21NC比较,miR‐21抑制剂能明显降低Hep2细胞活力[（0．688±0．043）vs．（0．375±0．012）],抑制细胞迁移能力[（6．57±0．02）μmvs．（20．49±2．18）μm]及细胞侵袭能力[（100．7±10．2）vs．（46．8±4．3）],差异均有统计学意义（P＜0．01）;同时miR‐21抑制剂能明显下调PI3K、MMP2及MMP9的表达（P＜0．01）,降低Akt的磷酸化水平（P＜0．01）,并上调PTEN及RECK的表达（P＜0．01）。结论miR‐21抑制剂能明显抑制人喉鳞癌细胞Hep2的迁移、侵袭能力,可能与PTEN／PI3K／Akt信号通路有关。     

原位杂交法检测喉癌组织中人乳头状瘤病毒的研究

采用原位核酸杂交技术，地高辛标记人乳头状瘤病毒（ＨＰＶ）６Ｂ／１１，１６／１８型ＤＮＡ作 探针，对４４例喉癌石蜡包埋标本中ＨＰＶ－ＤＮＡ同源序列进行了检测，同时用１６例喉息肉石蜡包埋 标本作为对照。结果显示：ＨＰＶ ６Ｂ／１１杂交阳性者在喉癌组为 ８／４４（１８． ２％），喉息肉组为２／１６ （１２．５％）（Ｐ＞０．０５）；ＨＰＶ １６／１８杂交阳性者在喉癌组为 １９／４４（４３．２％），喉息肉组为 ２／１６ （１２．５％）（Ｐ＜０．０５）。提示：ＨＰＶ １６／１８型感染与喉癌的发生有密切关系，是喉癌发病学中一个不 容忽视的致癌因素。     

人乳头状瘤病毒16E7在人喉癌细胞系中的转染及表达

目的:构建含人乳头状瘤病毒16E7(HPV16E7)基因的真核表达载体,观察HPV16E7对人喉癌HEp-2细胞系生物学特性的影响,为后续实验提供研究对象.方法:以含HPV16E7基因的中间质粒pET28a-HPV16E7为模板扩增出HPV16E7基因全长序列,将其克隆到真核表达载体pcDNA3.1/myc-His(-) B中,并进行序列分析和酶切鉴定.电穿孔法将重组体pcDNA3.1/myc-His-HPV16E7转染入喉癌HEp-2细胞中,Western 印迹法检测HPV16E7蛋白的表达,相差显微镜观察转染前后的HEp-2细胞系形态学变化,流式细胞仪检测转染前后细胞生长周期的改变.结果:成功构建并将pcDNA3.1/myc-His-HPV16E7转染入人喉癌HEp-2细胞中;转染后HEp-2细胞增生活跃,S期明显延长,并能够稳定表达HPV16E7蛋白.结论:HPV16E7有促进HEp-2细胞的致瘤活性;真核表达载体pcDNA3.1/myc-His-HPV16E7可为下一步建立动物模型和喉癌体外治疗实验提供研究工具.     

喉黏膜白斑和喉鳞状细胞癌中survivin表达的意义

目的 探讨survivin蛋白在喉黏膜白斑和喉鳞状细胞癌中的表达情况及其意义。方法 通过免疫组化法对28例喉黏膜白斑、46例喉鳞状细胞癌、24例癌旁组织和16例正常喉黏膜中survivin的表达情况进行检测。结果 发现survivin蛋白在喉黏膜白斑、喉癌组织和癌旁组织中的阳性表达率分别为46．43％（13／28）、71.74％（33／46）、33．33％（8／24）；在正常黏膜组织中没有表达，喉癌组中的阳性表达率分别显著高于正常组织、癌旁组织、喉黏膜白斑中的表达率。中重度不典型增生喉黏膜白斑组的阳性表达率（66．67％）显著高于轻度不典型增生的阳性表达率（23．08％），发生了恶变的5例喉黏膜白斑组织中survivin蛋白均为阳性表达，但与喉癌的发生部位、分级、分期、淋巴结转移以及病理分级没有关联。结论 survivin在中重度不典型增生喉黏膜白斑组织和喉癌组织中过度表达，参与了喉癌的形成，是喉癌形成的一个早期事件，可望成为预测喉癌癌前病变发展成恶性肿瘤的一个诊断工具。     

基因表达谱芯片发现36条喉鳞癌相关基因

目的：研究探讨喉鳞癌发生、发展中相关基因群的表达和初步功能。方法：按微矩阵排列的4096种全长基因PCR产物制成BioDoor4096型微矩阵表达谱芯片;采用条件优化的一步法抽提喉鳞癌及正常组织总RNA,用Qiagen公司Oligotex mRNA离心柱分离纯化两种组织的mRNA;经逆转录合成荧光分子（Cy3/Cy5)掺入的cDNA一链制备表达谱探针,芯片杂交和严格洗片后,用SanArray3000荧光扫描仪扫描芯片荧光信号图像,利用计算机分析肿瘤及正常组织中差异表达的基因。对所获得的基因进行分子生物信息学分析。结果：在4096种基因中,喉鳞状细胞癌与正常组织间存在差异表达的基因。在所检测的4对临床标本中,发现有差异表达的基因36条（0．88％）。生物信息学分析显示,该36条差异表达基因与肿瘤的发病机制可能存在相关性。结论：喉鳞状细胞癌的发生、发展中存在多因素表达调控的改变,对于相关基因群的研究有助于认识肿瘤发病机制。     

肺鳞癌与人乳头瘤病毒及p53表达的关系

目的 探讨肺鳞癌组织中人乳头瘤病毒（HPV）感染与p53蛋白表达的关系并分析作用机制。方法 收集84例肺鳞癌和18例支气管粘膜慢性炎症标本，采用地高辛标记的HPV－DNA探针，用原位杂交法检测组织中的HPV－DNA存在情况，并用免疫组化SABC法检测肺鳞癌组织中p53及HPVE6,E7蛋白的表达，将二者进行对照观察。结果 ①HPV原位杂交阳性信号位于细胞核内，肺鳞癌HPV检出率为49％，对照组慢性炎为6％，差异显著。②肺鳞癌组织中存在HPVE6，E7蛋白表达，免疫组化方法与原位杂交方法结果相符。③84例肺鳞癌中30例检出p53蛋白表达，其中17例HPV阳性，13例HPV阴性，HPV阳性组与阴性组差异不显著。结论 肺鳞癌与HPV感染关系密切，肺鳞癌组织中也存在p53基因表达，p53蛋白积聚与HPV感染无明显相关性。