卵巢上皮性肿瘤中Skp2、p27kipl、E-cad的表达

目的检测Skp2、p27kipl和E-cad在卵巢上皮性肿瘤中的表达情况及其相互关系。方法采用免疫组化SP法，检测99例卵巢上皮性肿瘤组织中Skp2、p27kipl及E-cad的表达。结果p27kipl在卵巢良性肿瘤、交界性肿瘤的表达率分别为76．5％、70．6％高于卵巢癌29．2％（P〈0．05），在早期癌中的表达高于晚期癌（P〈0．05）。Skp2在卵巢良性肿瘤、交界性肿瘤的表达率分别为0、23．5％，均低于卵巢癌50．8％（P〈0．05），在早期癌的表达低于晚期癌（P〈0．05）。卵巢癌中skp2表达与组织分化有关，在低分化癌的阳性表达率高于高分化癌（P〈0．05），在组织学类型方面，浆液性癌中skp2的阳性表达率高于非浆液性癌（P〈0．05）。E—cad在良性肿瘤、交界性肿瘤和卵巢癌表达率分别为88．2％、82．4％、55．4％，恶性组低于良性组（P〈0．05）。E—cad在早期癌的表达率高于晚期癌（P〈0．05）。Skp2表达与p27kipl表达呈负相关（P〈0．05），E-cad表达与p27kipl表达呈正相关（P〈0．05），而E-cad表达与Skp2表达则呈负相关（P〈0．05）。结论skp2过度表达与p27kipl表达减少可能与卵巢上皮性肿瘤的发生发展密切相关，而E-cad在晚期卵巢癌中表达降低可能反映了卵巢癌分化程度的降低。     

Skp2和p27kip1与肿瘤间关系的研究进展

目的：探讨Skp2和p27kip1与恶性肿瘤发生、发展的关系。方法：查阅相关中外文献,分析Skp2和p27kip1的生物学特性和功能以及与常见恶性肿瘤的关系。结果：Skp2通过泛素蛋白酶体途径降解磷酸化的p27kip1,促使细胞由G1期进入S期,导致肿瘤的发生。结论：Skp2-p27kip1可能代表一种致癌通路,其与肿瘤的关系正受到越来越多的重视。     

p27kip1和Skp2在损伤后大鼠坐骨神经中的表达变化

为了探讨损伤后周围神经p27kip1和S期激酶相关蛋白2(Skp2)的定位表达和变化,本实验将成年SD大鼠随机分为正常对照组、夹伤组和切断组,运用Western blot结合免疫组织化学及免疫荧光双标,在大鼠坐骨神经损伤时,对p27kip1和Skp2表达的影响进行了研究。结果表明:(1)坐骨神经夹伤后,p27kip1蛋白表达先逐渐下降,后又逐渐上升;坐骨神经切断后,远侧段p27kip1蛋白表达持续下降,而近侧段p27kip1蛋白表达在切断后6h明显下降,后又逐渐升高至正常水平,而Skp2表达变化与之相反;(2)免疫组织化学染色结果显示,坐骨神经切断后1w,远侧段从断端到末端,p27kip1阳性信号逐渐增加,而Skp2阳性信号逐渐减弱;(3)免疫荧光双标显示,正常和损伤坐骨神经的雪旺氏细胞中都有p27kip1和Skp2表达。以上结果提示:周围神经损伤后影响雪旺氏细胞中p27kip1和Skp2的表达变化,为进一步研究它们在周围神经损伤和修复中的作用机制奠定基础。     

p27kip1和Skp2在大鼠坐骨神经夹伤后脊髓中的表达变化

目的:研究p27~(kip1)和Skp2在正常和坐骨神经夹伤后大鼠脊髓中的表达变化。方法:Westem印迹法,免疫组织化学,免疫荧光双标。结果:Western印迹结果显示坐骨神经夹伤后,脊髓中p27~(kip1)表达下降后又有所恢复,并且p27~(kip1)和Skp2在脊髓中的表达变化呈负相关。免疫组织化学及免疫荧光双标显示,p27~(kip1)和Skp2在正常和损伤后的脊髓神经元和胶质细胞中都有表达。坐骨神经夹伤后p27~(kip1)和Skp2在脊髓腹角阳性细胞数目变化呈负相关。结论:坐骨神经损伤后p27~(kip1)。和Skp2在脊髓腹角神经元及其周围的胶质细胞表达变化相关,对研究脊髓损伤和修复的分子机制有重要意义。     

SKP2和p27kip1在结肠癌中的表达及其临床意义

结肠癌的发生、发展是涉及多因素、多步骤、多基因的过程,包括癌基因的突变和肿瘤抑制基因的失活。术后复发和转移是结肠癌患者的主要死因,筛查结肠癌高复发及高转移潜能患者是提高疗效的重要手段,但目前尚无高度特异性及高度敏感性的标志物。抑癌基因p27^kip1是细胞周期重要的负性调控因子,其缺失与肿瘤的发生、发展有关。SKP2蛋白特异作用于磷酸化的p27^kip1蛋白,使其通过泛素-蛋白酶体途径降解,与恶性肿瘤的发生有关。[第一段]     

鼻咽癌中p27kip1表达及其与临床病理特征相关研究

目的 检测p27kip1蛋白在鼻咽癌中的表达,分析其与临床病理特征的关系.方法 收集60例手术活检切取的鼻咽癌组织蜡块,与30例非肿瘤鼻咽组织石蜡标本作比较.应用免疫组织化学技术检测鼻咽癌组织中p27kip1蛋白的表达,回顾性研究鼻咽癌患者的临床病理特征.结果 p27ksp1蛋白在鼻咽癌细胞核和细胞质中均有表达.鼻咽癌组织中细胞核表达阳性率为46.7%(28/60),低于非肿瘤鼻咽组织细胞核表达的90%(27/30),P＜0.01;而在细胞质中阳性率为68.3%(41/60),显著高于非肿瘤鼻咽组织的细胞质表达的20%(6/30),P＜0.01.未发现p27kip1蛋白在细胞核和细胞质表达与鼻咽癌原发灶的范围和局部侵犯程度有关,但p27kip1蛋白胞核表达与淋巴结转移、远处转移和TNM临床分期有关;细胞质表达仅与淋巴结转移和TNM临床分期有关,可见p27kip1蛋白胞核表达与临床病理的关系更为密切.结论 与非肿瘤鼻咽组织相比,p27kip1蛋白为细胞核低表达、细胞质高表达.鼻咽癌中p27kip1蛋白存在不同于非肿瘤鼻咽组织的错误的核质定位,其在细胞核中表达的减少或丢失可能与鼻咽癌的恶性发展有关,提示p27kip1蛋白的异常表达和定位可能涉及鼻咽癌的分期和转移.     

鼻咽癌中p27kip1表达及其与临床病理特征相关研究

Objective To inrestigate the expression of p27kip1 protein and its association with clinicopathologic features in nasopharyngeal carcinoma. Methods Immunohistochemistry was performed to detect p27kip1 expression in 60 paraffin- embedded nasopharyngeal carcinoma samples and 30 paraffinembedded non-cancer nasopharyngeal tissue samples. Results Nuclear and cytoplasmic p27kip1 staining was detected in nasopharyngeal carcinoma samples. Of 60 nasopharyngeal carcinoma samples, 46.7% (28/60)were positive for p27kip1 in cell nuclei, compared with as found in non-cancer nasopharyngeal tissue [90%(27/30), P＜0.01 ], and 68.3% (41/60) were positive in cytoplasma, compared with 20% (6/30) of noncancer nasopharyngeal tissue (P＜0.01). Both nuclear and cytoplasmic expression of p27kip1 were not associated to tumor size and local invasion, while positive nuclear expression of p27kip1 was significantly associated to nodal and remote metastasis and TNM stage. Cytoplasmic expression of p27kip1 was associated to nodal infiltration and TNM stage. Conclusions Compared to that in non-cancer tissue, p27kip1 is upregulated in cytoplasm and down- regulated in nuclei of nasopharyngeal carcinoma tissue, presenting a mislocalization. Less or no nuclear expression of p27kip1 may be associated to malignant progression of nasopharyngeal carcinoma. Abnormal expression and location of p27kip1 may be associated to nasopharyngeal stage and metastasis.     

骨巨细胞瘤中Skp2、p27及E2F-1的表达及意义

目的研究骨巨细胞瘤中Skp2(S期激酶相关蛋白2)、p27(周期素依赖性蛋白激酶抑制因子)及E2F-1(细胞周期相关性转录因子家族成员)的表达并探讨其与放射学分期、肿瘤复发等关系。方法运用免疫组化SP法检测44例骨巨细胞瘤中Skp2、p27及E2F-1的表达情况。结果 Skp2、p27及E2F-1的阳性率分别为65.91%3、8.64%和63.64%,在影像学分期1型、2型3、型中的阳性率分别为50%、64.29%、100%(P<0.05),60%、28.57%、10%(P<0.05),50%、71.43%、80%(P>0.05)。Skp2、p27及E2F-1在复发组与未复发组的阳性率分别为91.67%、56.25%(P<0.05),8.33%、50%(P<0.05),75.00%、59.38%(P>0.05)。Skp2、骨皮质破坏或软组织浸润、手术方式以及p27对复发均有明显影响,其中前两者是骨巨细胞瘤复发的危险因素,后两者(截骨的手术方式、p27)则是骨巨细胞瘤复发的保护因素。Skp2与p27的表达呈负相关(P<0.05)。结论在骨巨细胞瘤中,Skp2与p27的表达均与骨巨细胞瘤的复发有关,二者在骨巨细胞...     

肾癌中cyclinD1和p27kip1的表达及其意义

目的探讨cyc lin D1、p27k ip1在普通型肾细胞癌(renal cell carc inom a,RCC)发生、发展中的作用。方法用半定量RT-PCR方法检测25例普通型RCC和10例肿瘤远端的正常肾组织中cyc lin D1的mRNA含量,用免疫组化方法检测76例普通型RCC中cyc lin D1和p27k ip1蛋白的表达,并对cyc lin D1、p27k ip1蛋白表达与临床病理参数的关系进行分析。结果普通型RCC中cyc lin D1的mRNA含量0.488±0.399,高于正常对照组0.089±0.066(P<0.01)。cyc lin D1的表达与肿瘤体积大小有关,体积大者cyc lin D1高表达(P<0.05)。普通型RCC中p27k ip1表达低于正常对照组,随着p27k ip1表达的降低,肿瘤的细胞核Fu-hrm an分级、TNM分期增高。结论cyc lin D1高表达和p27k ip1的低表达与普通型RCC的发生有关;p27k ip1的低表达可能促进肿瘤的演进,p27k ip1的表达可作为评价普通型RCC预后的参考指标。     

p27在胃癌组织中表达的意义

胃癌的发生、发展和转移涉及多种基因异常 ,其中癌基因的激活和抑癌基因的失活起着十分重要的作用。ｐ2 7Ｋｉｐ1为近年新发现的一种抑癌基因 ,其表达产物 ｐ2 7蛋白参与调控细胞周期和细胞凋亡 ,为细胞周期负性调节因子 ,它在胃癌中的表达国外已见报道〔1〕,认为ｐ2 7Ｋｉｐ1表达减少是中晚期胃癌预后不良的指标 ,但国内相关性研究较少。笔者运用免疫组化Ｓ Ｐ法 ,对 6 2例胃癌组织中的 ｐ2 7Ｋｉｐ1进行表达研究 ,目的在于探讨 ｐ2 7Ｋｉｐ1在胃癌组织中表达的确切意义及其与胃癌临床病理参数之间的相关性 ,进而分析它们在胃癌发生、发展…     

胃肠道类癌中p27kip1、PCNA表达及p16基因缺失

目的 :探讨 p2 7kip1 、PCNA及 p1 6与胃肠道类癌转移的关系。 方法 :采用免疫组化SABC法检测 2 5例胃肠道类癌组织中p2 7kip1 和PCNA蛋白表达 ,同时用PCR法检测 p1 6基因的缺失情况。 结果 :p2 7kip1 在胃肠道类癌阳性表达率为 64 % (1 6/ 2 5) ,PCNAⅠ～Ⅱ级和Ⅲ～Ⅳ级表达率分别为 56 %、44 %。 2种蛋白阳性表达率与分化程度无相关性 (P >0 0 5) ,与淋巴结转移相关 (P <0 0 5)。p2 7kip1 与PCNA表达负相关。p1 6基因纯合性缺失率为 48% (1 2 / 2 5) ,其缺失率与类癌分化程度和淋巴结转移无关。结论 :p2 7kip1 低表达、PCNA高表达与胃肠道类癌转移有关 ,胃肠道 ;类癌的发生与p1 6基因缺失有关 ,但可能为早期分子事件。     

Aberrant p27kip1 expression in endocrine and other tumors.

The p27kip1 (p27) gene encodes an inhibitor of cyclin-dependent kinase activity. The expression of p27 protein in normal and neoplastic tissues was investigated by immunoblotting and immunohistochemistry. Immunoblotting studies detected a 27-kd protein band that was decreased in neoplastic pituitary tissues compared with normal pituitary. Immunostaining of 177 tissues showed abundant expression of p27 protein in normal tissues with decreased numbers of immunoreactive cells in adenomas and carcinomas in both endocrine and nonendocrine tissues. p27 expression was inversely related to the proliferation marker Ki-67 antigen detected with monoclonal antibody MIB-1. Parathyroid adenomas and hyperplasias had similar Ki-67 labeling indices; however, hyperplasias had threefold more p27-positive cells than parathyroid adenomas, suggesting that p27 immunostaining may be useful in distinguishing between these two conditions. These results indicate that there is widespread aberrant p27 expression in hyperplastic tissues and in benign and malignant neoplasms compared with normal tissues. Immunohistochemical analysis of p27 along with Ki-67 may be used to assess the biological behavior of various neoplasms, to classify hyperplastic and neoplastic tissues, and to study cell cycle regulation during tumor progression.     

Expression of cyclin-dependent kinase inhibitor p27kip1 in malignant lymphomas

p27kip1 is a cyclin-dependent kinase inhibitor that regulates progression from G1 into S phase. Aberrations in cell cycle control are often observed in tumors and might even be necessary in tumor development. Recent reports showed that low p27kip1 expression is associated with poor prognosis in several tumors and leukemia. To investigate the expression of p27kip1 in malignant lymphomas and elucidate the role of p27kip1 as a possible prognostic indicator, the authors performed an immunohistochemical staining of p27kip1 correlated with Ki-67 labelling index and clinical parameters. p27kip1 expression was reduced variably in most malignant lymphomas and inversely correlated with Ki-67 labelling index (p=0.0151). Regarding chemotherapeutic response, p271kip1 expression in the complete remission group showed statistically significant difference in expression compared to the progressive disease group (p=0.0021). There were significant differences in survival between cases with low and high p27kip1 expression (p=0.0071). In a multivariate Cox analysis, p27kip1 expression was independent prognostic factors as well as other known prognostic factors including age, grade, stage and chemotherapeutic response. In conclusion, the study suggests that reduced expression of p27kip1 protein may play a role in the pathogenesis and biologically aggressive behavior of malignant lymphomas.     

Expression of p27kip1 in breast cancer and its prognostic significance

p27kip1 is a member of the KIP/CIP family of cyclin-dependent kinase inhibitors and is a negative cell-cycle regulator that is thought to play a role in tumour suppression. Reduced levels of this protein have been observed in a number of human cancers. However, evidence is conflicting as to whether p27kip1 has a role to play in breast cancer, including predicting behaviour and prognosis. The present investigation aimed to provide a definitive study of 830 breast cancer cases with median patient follow-up of 104 months to determine the true prognostic significance, if any. Immunohistochemical analysis of tissue microarrays and three scoring methods were used to assess p27kip1 expression. Univariate analysis showed a significant relationship between reduced p27kip1 expression and increasing tumour grade, nuclear pleomorphism, mitosis, and decreasing tubule formation (all p<0.001). Significant associations between reduced p27, negative oestrogen receptor status, and ductal/no special type tumours were also observed. Survival analysis demonstrated that patients with tumours with high p27kip1 levels had an improved survival compared with those with cancers with low expression. On multivariate analysis, when compared with existing factors, p27kip1 was not, however, an independent prognostic factor. It is concluded that the inverse relationship between p27kip1 levels and histological grade and individual grade components suggests a role for p27kip1 in both cell proliferation and differentiation, but is not clinically useful.     

前列腺癌组织中Skp2、p27的表达及临床意义

目的 研究前列腺癌(prostate cancer,PCa)组织中细胞S相激酶相关蛋白2(Skp2)、p27蛋白的表达及临床意义.方法 选取2016年1月至2017年1月我院120例PCa住院患者手术标本纳入研究,依据分化程度差异将PCa分为低分化组(n=56)、中分化组(n=28)与高分化组(n=36),并将这120例患者癌旁组织纳入对照组(n=120),以免疫组化法分析Skp2、p27在PCa中表达程度及PCa危险因素等级之间相关性.结果 PCa组Skp2阳性表达率(53.33％)明显高于对照组(23.33％),且p27蛋白阳性表达率(41.67％)明显低于对照组(86.67％);高、中、低分化组Skp2阳性表达率排序为:高＜中＜低,三组比较差异具有统计学意义(P＜0.05);高、中、低分化组p27蛋白阳性表达率排序为:高＞中＞低,三组比较差异具有统计学意义(P ＜0.05);Skp2阴性表达组术前PSA水平＜4μg/L比例(67.86％)与肿瘤穿透前列腺被膜比例(89.29％)明显高于阳性组(28.13％、62.50％)(P＜0.05);p27蛋白阴性表达组术前PSA水平＜4μg/L比例(31.43％)与肿瘤穿透前列腺被膜比例(68.57％)明显低于阳性组(68.00％、92.00％)(P＜0.05);Skp2表达与PCa危险因素等级具有正相关关系(r =0.513,P＜0.05),而p27蛋白表达与PCa危险因素等级具有负相关关系(r=-0.747,P＜0.05).结论 PCa组织中,Skp2为高表达,p27蛋白为低表达,和PCa分化程度存在紧密联系,Skp2与p27蛋白的检测能够为PCa的发生、发展及患者治疗提供帮助.