Expression of p53 protein and proliferating cell nuclear antigen in human gestation trophoblastic disease

Objective: To study the relationship between p53 protein, proliferating cell nuclear antigen (PCNA) expression and benign or malignant gestational trophoblastic disease (MGTD). Methods: The histotomic sections of 48 patients with gestational trophoblastic disease and 24 patients of normal chorionic villi were stained using immunohistochemistry. The monoclonal antibodies were used to determine p53 protein and PCNA. Results: The frequency of p53 and PCNA positive expression were significantly different among the chorionic villi of normal pregnancy, hydratidiform mole (HM) and MGTD. But neither p53 nor PCNA has any relation with the clinical staging or metastasis of MGTD. Conclusion: Both P53 and PCNA are valuable in diagnosis of human gestational trophoblastic disease.     

Immunohistochemical detection of p53 protein and proliferating cell nuclear antigen (pcna) in salivary-gland tumors

The expression of p53 protein and PCNA was immunohistochemically examined in 161 cases of salivary gland tumors. The p53 protein was positive in 23.8% (24/101) of malignant salivary gland tumors, while only one case of 60 pleomorphic adenomas was positive. p53 protein was frequently detectable in salivary duct carcinoma (60%), basal cell adenocarcinoma (66.7%), acinic cell carcinoma (53.3%) and undifferentiated carcinoma (50%), but was rarely seen in adenoid cystic carcinoma (17.2%) and mucoepidermoid carcinoma (0%). p53 protein was more frequently detectable in PCNA positive cases than in negative cases (p=0.0074).     

p53蛋白与增殖细胞核抗原在胃癌中表达及其临床意义

目的研究p53、增殖细胞核抗原(PCNA)在胄癌中的表达及其与临床病理和预后的关系.方法采用免疫组化技术(S-P法)对33例胃癌组织及20例正常胃粘膜组织进行p53、PCNA检测.结果 p53、PCNA阳性表达率分别为57.6%,93.9%;PCNA强阳性表达率为67.7%;p53阳性表达率及PCNA强阳性表达率均与胃癌组织类型、浸润深度、淋巴结转移密切相关.差异具有显著性(P＜0.05);p53蛋白表达与PCNA强阳性表达呈正相关.结论联合检测p53和PCNA对判断胃癌的恶性程度、浸润深度和淋巴结转移趋势和预后具有重要价值.     

p53、c-erbB2基因、增殖细胞核抗原表达与卵巢上皮性癌预后的关系

背景与目的：p53、c-erbB2基因和增殖细胞核抗原（proliferating cell nuclear antigen,PCNA)的表达与卵巢癌预后关系问题已有报道,由于研究方法、样本大小等方面的不同,结果存在差异。为进一步探讨p53、c-erbB2基因和PCNA表达与卵巢上皮性癌预后的关系,我们进行了本研究。材料与方法：1990年3月1日至1994年3月31日间确诊的卵巢上皮性癌共84例,采用标记的链白素－生物素辣根过氧化酶复合物（LSAB）免疫组化方法检测癌组织中p53、c-erbB2基因和PCNA的表达,使用SPSS8．0版分析它们的表达与卵巢癌患者平均生存期、5年生存率之间的关系。结果：本组84例癌组织中,p53、c-erbB2和PCNA表达的阳性率分别为58．3％（49／84）、77．5％（65／84）和100％（84／84）。单因素分析显示,c-erbB2过度表达和PCNA表达强度与患者的平均生存期、5年生存率均呈负相关（P值分别为0．05和小于0．01）,未发现p53蛋白表达与患者的平均生存期、5年生存率之间存在相关性（P＞0．05）。多因素分析发现卵巢上皮性癌的预后与临床分期、组织分化程度有关,而与p53、c-erbB2和PCNA的表达均无相关性。结论：p53的表达与卵巢上皮性癌的预后无关,而c-erbB2、PCNA表达对卵巢上皮性癌预后的影响是间接的。临床分期、组织分化程度仍是卵巢上皮性癌独立的预后因素。     

Aspirin acetylates wild type and mutant p53 in colon cancer cells: identification of aspirin acetylated sites on recombinant p53

Tumor Biology - Aspirin’s ability to inhibit cell proliferation and induce apoptosis in cancer cell lines is considered to be an important mechanism for its anti-cancer effects. We previously...     

Prognostic relevance of proliferating cell nuclear antigen and p53 expression in non-small cell lung cancer.

Prognostic value of p53 and PCNA expression in non-small cell lung cancer (NSCLC) remains controversial. In this study we determined the relevance of these abnormalities in terms of overall survival and disease-free survival in 95 NSCLC patients who underwent curative pulmonary resection. Expression of p53 was found in 44 samples (45%), expression of PCNA-in 79 samples (83%), and expression of both markers-in 35 samples (36%). There was no relationship between expression of either protein and major clinicopathological characteristics. Median survival for patients with and without p53 expression was 36 and 33 months, respectively and 5-year survival probability-29 and 37%, respectively (P=0.73). Median survival for patients with and without PCNA expression was 36 and 27 months, respectively and 5-year survival probability-35 and 25%, respectively (P=0.60). There was no significant difference in overall survival between particular groups of patients with tumors carrying four possible p53/PCNA phenotypes. In multivariate analysis including patient age, sex, tumor stage, tumor type and differentiation, p53 and PCNA expression, the only variable important for survival was stage of disease. These results suggest the lack of prognostic relevance of p53 and PCNA expression in surgically treated NSCLC patients.     

增殖细胞核抗原在卵巢上皮性癌的表达及其临床意义

探讨增殖细胞核抗原表达与卵巢上皮性癌生物学行为及预后的关系。材料与方法：采用ＬＳＡＢ免疫组化方法检测８４例石蜡包埋的卵巢上皮性癌组织中增殖细胞核抗原的表达,分析其与患者的年龄、临床分期、组织分化程度、组织学类型及预后之间的关系。     

垂体腺瘤p53基因Ki-67细胞增生抗原的表达及其临床意义

目的探讨垂体腺瘤p53基因和Ki-67细胞增生抗原表达的变化与肿瘤侵袭行为、肿瘤复发的相关性。方法经手术切除的垂体腺瘤标本67例,按影像学显示的肿瘤大小分为A,B两组(<2.5cm为A组,>2.5cm为B组),用免疫组化方法分别检测p35基因与Ki-67的表达,临床随访1￣3年,观察肿瘤复发情况。结果A组39例中p53阴性11例,低表达28例,Ki-67均为低表达,3年内肿瘤复发4例;B组26例(达到侵袭性标准),p53均显示高表达,Ki-67中度表达10例,高表达16例,其中11例肿瘤3年内复发,两组比较有显著差异(P<0.05)。结论垂体腺瘤的p53和Ki-67的表达与肿瘤的侵袭性呈正相关,而Ki-67的高表达还与肿瘤的复发有关。     

上颌窦恶性肿瘤组织中p53和PCNA的表达及其意义

背景与目的：据文献报道,p53和增殖细胞核抗原（proliferating cell nuclear antigen,PCNA)与恶性肿瘤的发生发展有密切关系,本研究检测p53和PCNA在上颌窦恶性肿瘤、良性肿瘤和炎症性病变中表达的强度差异,探讨p53和PCNA与上颌窦恶性肿瘤临床分期、病理分型及淋巴结转移的关系。方法：用免疫组化的方法检测108例上颌窦恶性肿瘤、19例上颌窦良性肿瘤、8例鼻粘膜炎症中p53与PCNA的表达情况。数据统计采用秩和检验,并用平均秩衡量p53和PCNA的阳性表达强度。结果：在上颌窦良性肿瘤和鼻粘膜炎症两组中,p53和PCNA的平均秩分别为42．8、50．3和47．9、46．8;在恶性肿瘤组中,p53和PCNA平均秩分别高达73．0和73．2;在上颌窦恶性肿瘤中,鳞癌p53的平均秩为60．7,比腺癌的平均秩（43．9）高,有显著性差异（P＜0．05）。但临床分期I－Ⅳ期中,p53平均秩分别为46．6、50．1、56．1、55．0,PCNA平均秩分别为60．5、48．8、56．1、53．9;在无淋巴结转移组和有淋巴结转移组中,p53平均秩分别为53．7和57．3,PCNA平均秩分别为53．9和56．4;在生存期＜3年、＜5年和≥5年等3组中,p53平均秩分别为49．9、53．7和48．5,PCNA平均秩分别为45．7、56．9和52．0,均无显著性差异（P＞0．05）。结论：p53和PCNA与上颌窦恶性肿瘤尤其是鳞癌的发生、发展有一定相关性,而与上颌窦恶性肿瘤的临床分型、淋巴结转移和预后无关。     

大肠腺瘤癌变过程中β-catenin、p53和增殖细胞核抗原表达的研究

目的 探讨β－catenin、p53和增朱（PCNA）在大肠腺瘤癌变中的可能作用。方法 以免疫组织化学方法检测77例大肠腺瘤（CRA）及癌变组织中β－catenin、p53蛋白及PCNA的表达情况。结果 CRA随上皮不典型增生程度的提高以及癌变的出现,β－catenin异常表达率逐渐增高（P＜0.05）。伴中、重度上皮不典型增生的CRA和CRA癌变的出现,β－catenin核表达阳性率均明显高于上皮轻度不典型增生的CRA（P＜0.01）。CRA伴轻度不典型增生和CRA伴中、重度不典型一及CAR癌变3组的p53蛋白和PCNA表达依次增高,其阳性率分别为10.3%、43.8%、75.0%和17.2%、62.5%、87.5%。在β－catenin核表达阳性者中,其PCNA的强阳性表达率明显高于β－catenin核表达阴性者（69.7%和36.4%,P＜0.05）;在p53蛋白表达阳性者中,其PCNA的强阳性表达率明显高于p53表达阳性者（72.4%和37.5%,P＜0.05）。在CRA癌变组中,有50.0%可见β－catenin和p53同时表达。结论 β－catenin、p53和PCNA在CRA癌变过程中可能发挥了重要作用。     

DNA synthesis enzymes and proliferating cell nuclear antigen in normal and neoplastic nerve cells.

The activity of nuclear DNA polymerases alpha, beta and delta/epsilon, uracil-DNA glycosylase, thymidine kinase and the presence of Proliferating Cell Nuclear Antigen (PCNA) have been examined in developing rat glial cells, in rat and human glioma, in human neuroblastoma and in differentiated neuroblastoma cell lines in vitro. During glial development the activity of all enzymes tested, except DNA polymerase beta, markedly decreased, suggesting their coordinate regulation in respect to the proliferative state of the cells. Glioma and neuroblastoma cell lines restore the enzymatic activities that were no longer expressed in normal adult cells. Neuroblastoma cell lines induced to differentiate in vitro by retinoic acid showed a decline of the activities of DNA polymerase alpha, DNA polymerase delta/epsilon, uracil-DNA glycosylase and thymidine kinase similar to that observed during in vivo differentiation. We also demonstrate that PCNA is not detectable in glial and neuronal cells at all developmental stages, but can be found in tumor nerve cells. A possible use of enzymatic assays or anti-PCNA antibodies to detect brain tumors is discussed.     

Association of p53, K-ras and proliferating cell nuclear antigen with rat lung lesions following exposure to simulated nuclear fuel particles.

Expression of p53, K-ras, and proliferating cell nuclear antigen (PCNA) and mutations of p53 and K-ras genes in lung lesions of Han/Wistar rats were investigated by immunohistochemistry and direct DNA sequencing following a long-term exposure of animals to neutron-activated UO2 particles. The p53 protein was overexpressed in all five malignant tumors, in 62% of benign tumors, and in 42% of hyperplastic lesions examined. K-ras protein and PCNA levels were only slightly elevated in all types of lung lesions. In three malignant tumors a C-->T transition was detected in codon 288 (human 290) of the p53 gene, but this mutation was not present in seven other tumors analyzed. No mutations were detected in codons 12/13 and 61 of the K-ras gene in any of the five tumors analyzed. Our findings suggest that K-ras overexpression is a rare alteration, whereas p53 protein overexpression (sometimes associated with mutated p53 gene), as assessed with the CM5 antibody, is a relatively common phenomenon in hot particle-induced preneoplastic and neoplastic rat lung lesions.     

子宫颈上皮内瘤样病变和子宫颈鳞癌组织中p53与MDM2的表达及其与PCNA的关系

探讨ＭＤＭ２、ｐ５３蛋白、增殖细胞核抗原（ｐｒｏｌｉｆｅｒａｔｉｎｇ ｃｅｌｌ ｎｕｃｌｅａｒ ａｎｔｉｇｅｎ,ＰＣＮＡ）在宫颈癌发生、发展中的作用。方法：用免疫组化ＳＰ法检测ＭＤＭ２、Ｐ５３蛋白及ＰＣＮＡ在７６例正常宫颈上皮、宫颈上内瘤样病变（ｃｅｒｖｉｃａｌ ｉｎｔｒａ－ｅｐｉｔｈｅｌｉａ ｎｅｏｐｌａｓｍ,ＣＩＮ）、颈鳞     

大肠肿瘤cyclin D1、p21WAF1/CIP1、p53和增殖细胞核抗原的免疫组化研究

目的：探讨细胞周期调控因子表达在大肠肿瘤发生发展中的作用及其预后的影响。方法：彩免疫组化染色对１１３例大肠癌、１４例大肠腺瘤、１１例腺瘤癌变组织中ｃｙｃｌｉｎＤ１、ｐ＾２１＾ＷＡＦ１／ＣＩＰＩ、ｐ＾５３和ＰＣＮＡ进行了检测。结果：大肠癌组织ｃｙｃｌｉｎＤ１和ｐ＾５３阳性表达率分别为５４．８７％和５６．６４％,均显著高于正常大肠组织（Ｐ〈０．０５）。高分化腺癌ｐ＾２１蛋白阳性表达率６９．７０％,低分     

子宫内膜增生及癌变组织中增殖细胞核抗原与p16和p53基因表达的相关性研究

目的探讨增殖细胞核抗原（PCNA）及基因p16、p53在单纯性子宫内膜增生（ESH）、子宫内膜不典型增生（EAH）和子宫内膜癌（EC）组织中表达情况。方法应用免疫组化法分别对26例EC、28例EAH、24例ESH组织进行PCNA和p16、p53基因蛋白定位及表达程度检测,并对比其差异,分析它们之间的关系。结果PCNA在ESH、EAH和EC3组病例中强阳性表达分别为16．7％、82．1％和96．2％,ESH与EAH、EC比较差异有统计学意义（P〈0．01）,而EAH与EC比较差异无统计学意义（P〉0．05）。p16在ESH、EAH和EC3组病例中阳性表达分别为95．8％、46．4％和50．0％,ESH与EAH、Ec组比较差异有统计学意义（P〈0．05）;EAH与EC组比较差异无统计学意义（P〉0．05）。p53在ESH组无阳性表达病例,EAH组阳性率25％,EC组阳性率65．4％,3组病例之间比较差异均有统计学意义（P〈0．01）。结论PCNA、p53表达在子宫内膜增殖性病变、细胞恶性转化的进程中呈递增趋势,而p16趋于递减,提示细胞的过度增殖和增殖-凋亡相关基因的表达失衡在子宫内膜恶性转化过程中起重要作用。PCNA、p16和p53的异常表达可作为子宫内膜增生性疾病不同发展阶段的诊断及预测其生物学行为的参考指标。