膀胱移行细胞癌中p53突变、bcl-2和PCNA表达的临床意义(英文)

目的探讨膀胱癌中 bcl-2、p53、PCNA 表达与细胞增殖、凋亡和临床病理学参数之间的关系。方法 SABC 免疫组化分折62例(T1G1-G339例,T2-T4aG3 NOM023例)甲醛固定和石蜡包埋的膀胱癌标本 bcl-2、p53和 PCNA 蛋白的免疫反应性。平均随访37个月,24例复发。增殖指数(PI)表示肿瘤细胞中 PCNA 阳性细胞百分比。TUNEL 法检测细胞凋亡,凋亡指数(AI)表示肿瘤细胞中凋亡细胞的百分比。结果 62例膀胱癌中,50例(80.0%)发生 p53突变,与 G1(72.7%)和 G2(78.5%)相比较 G3(91.3%)更多见(P<0.05);pT2期(95.7%)p53突变率较 pTa-1期(74.3%)高(P<0.01)。14例(22.5%)发现有 bcl-2表达,bcl-2表达阳性率 G3明显高于 G1和 G2(P<0.05),与分期无关(P>0.05)。Bcl-2表达与 p53突变无关。在膀胱癌中,PI 为17.2%～41.8%(平均为22.4%),AI 为1.9%～3.5%(平均为2.9%)。统计分析显示 PI 与肿瘤分级、分期关系密切,AI 与肿瘤的分级有明显关系。结论结果表明,p53突变与浸润性行为呈正相关。在膀胱癌中 p53和 PCNA 过表达可能能提供有价值的预后信息。随着肿瘤的进展,肿瘤细胞过度增殖可能伴有频繁的凋亡,但增殖指数的增加明显强于凋亡指数的增加。     

直肠黏膜下注射复方氟脲嘧啶多相脂质体对直肠癌细胞凋亡和增殖的影响

目的探讨直肠黏膜下注射复方氟脲嘧啶多相脂质体(FPLC)对直肠癌细胞凋亡和增殖的影响。方法将40例直肠癌患者分为2个组:Ⅰ组化疗组(20例):于术前60h、36h,分2次直肠黏膜下注射FPLC,每次80mg。Ⅱ组对照组(20例):术前不用化疗。采用HE染色检测2组手术前后癌细胞的凋亡指数;S-P免疫组织化学法检测2组手术前后癌组织中PCNA、bcl-2和p53蛋白的表达,根据PCNA染色计算增殖指数,比较2组上述指标手术前后的变化。结果组患者术后癌细胞凋亡指数(apop-totic index,AI)(2.505±0.838)较术前(1.290±0.552)明显增加(P<0.001);癌细胞的增殖指数(proliferativeindex,PI)(41.335±18.778)较术前(45.755±21.478)明显下降(P<0.05);术后癌细胞bcl-2、p53蛋白的阳性表达均较术前明显下调(P<0.05)。Ⅱ组患者上述指标无明显改变。结论直肠黏膜下注射FPLC可使癌细胞AI明显增加,PI明显下降,bcl-2、p53蛋白阳性表达下调,说明FPLC可显著诱导直肠癌细胞的凋亡,抑制其增殖。     

膀胱癌细胞凋亡及p53基因表达的意义

目的探讨膀胱癌细胞凋亡及p53基因表达的意义。方法采用免疫组织化学方法及TUNEL法,检测11例正常膀胱黏膜和83例膀胱移行细胞癌中p53基因的表达及细胞凋亡指数。结果83例膀胱移行细胞癌中p53阳性50.6%,凋亡指数(AI)=1.4335±0.3863。p53阳性表达与膀胱癌病理分级及临床分期呈正相关(γ=0.492,P<0.01;γ=0.341,P<0.01);凋亡指数(AI)与膀胱癌病理分级及临床分期呈正相关(γ=0.642,P=0.000<0.01;γ=0.455,P=0.000<0.01);AI与p53表达无相关性。AI、p53表达与患者5年生存率有关。结论临床联合运用临床分期及病理分级并检测p53可用于判断膀胱移行细胞癌的预后。     

PCNA及bcl-2基因在膀胱移行细胞癌组织中的表达及其意义

目的：探讨PCNA和bcl-2基因在膀胱癌组织中的表达及其预后意义，了解肿瘤增殖与凋亡的特点，揭示细胞凋亡和增殖在膀胱癌发生发展中的作用。方法：采用免疫组织化学LSAB法，对78例膀胱移行细胞癌组织进行PCNA和bcl-2表达的检测。结果：在膀胱癌中，PCNA主要呈胞核表达，bcl-2呈胞质表达，PCNA和bcl-2染色阳性率分别为35．9％和56．4％；PCNA表达与膀胱移行细胞癌组织分级、预后呈正相关(P=0．01，P=0．0386)，bcl-2亦与肿瘤分级、预后呈高度正相关(P=0．0002，P=0．0116)；PCNA和bcl-2表达无明显相关(P=0．2327)。结论：PCNA和bcl-2参与膀胱癌的恶性转化、侵袭及进展的过程；检测PCNA和bcl-2有助于判断膀胱肿瘤恶性分化程度，并且二者可以作为预后的评价指标。     

bcl-2、bax和p53在鼻咽鳞癌中的表达及其与瘤细胞凋亡的关系

目的探讨bcl-2、bax和p53在鼻咽鳞癌中的表达及其与瘤细胞凋亡指数的关系。方法用免疫组织化学SP法检测48例鼻咽鳞癌中bcl-2、bax和p53的表达,用TUNEL法检测鼻咽鳞癌细胞的凋亡指数。结果48例鼻咽鳞癌中bcl-2、bax和p53阳性率分别为85.00%(41/48)、68.00%(33/48)和77.00%(37/48)。48例鼻咽鳞癌细胞的平均凋亡指数为25.62±25.78/HPF,凋亡指数与bcl-2、bax和p53的表达无相关性。结论鼻咽鳞癌中bcl-2和bax均呈高表达且已达到相对平衡,推测它们可能并不起到介导瘤细胞凋亡的主导作用。鼻咽鳞癌中p53的过表达可能已经失去了对bcl-2和bax表达的调节进而影响细胞凋亡的功能。     

HK-Ⅱ在结肠癌组织中的表达及其临床意义

目的检测己糖激酶-Ⅱ(HK-Ⅱ)在人结肠癌组织中的表达,并探讨其与肿瘤细胞增殖、凋亡的关系及临床意义。方法采用免疫组织化学法检测68例结肠癌组织HK-Ⅱ和增殖细胞核抗原(PCNA)表达,采用脱氧核糖核苷酸转移酶介导的原位缺口末端标记 (TUNEL) 法检测细胞凋亡,计算增殖指数(PI)和凋亡指数(AI)。结果52例结肠癌组织HK-Ⅱ表达阳性,阳性率为76.5%。HK-Ⅱ阳性表达的结肠癌PI显著增高,而AI明显下降(均P<0.01)。结肠癌HK-Ⅱ表达在患者年龄、性别和肿瘤发生部位之间的差异无统计学意义(P>0.05);但在肿瘤分化程度、分期和淋巴结转移之间差异有统计学意义(P<0.05)。结论HK-Ⅱ在结肠癌增殖和进展中起着重要作用,可作为结肠癌恶性预后指标和临床治疗靶点。     

膀胱癌细胞凋亡、P-gP、MDM2、p53基因表达的意义

目的:研究膀胱癌细胞凋亡、P-gp、MDM2、p53基因表达的意义。方法:采用免疫组化法及TUNEL法检测11例正常膀胱黏膜和83例膀胱移行细胞癌中P-gp、MDM2、p53基因的表达及细胞凋亡指数(AI)。结果:83例膀胱移行细胞癌中P-gp阳性71.08%,p53阳性50.6%,MDM2阳性59.03%,AI=1.4335±0.3863。MDM2阳性表达与病理分级及临床分期呈负相关(r=-0.263,P=0.016及r=-0.388,P=0.001);p53阳性表达与病理分级及临床分期呈正相关(r=0.492,P=0.001;r=0.341,P<0.01);P-gp阳性表达与病理分级及临床分期无相关性;P-gp、MDM2、p53 3种蛋白间表达无相关性;AI与MDM2呈负相关(r=-0.226,P=0.042);AI与病理分级及临床分期呈正相关(r=0.642,P=0.000;r=0.455,P=0.000);AI与P-gp、p53无相关性。AI、p53、MDM2的表达与5年生存率有关。结论:检测P-gp可指导膀胱癌化疗药物的选择;联合运用临床分期及病理分级并检测p53、MDM2可用于判断膀胱移行细胞癌的预后。     

消化道肿瘤组织中P-gp、凋亡抑制蛋白表达与体外化疗药敏性的关系及其意义

背景与目的:p-糖蛋白(P-gp)介导的经典耐药途径和细胞凋亡抑制是肿瘤多药耐药(MDR)研究最多的两种机制,肿瘤细胞多种MDR相关基因/蛋白共同表达、相互作用而出现多态性耐药.本研究通过分析肿瘤P-gP和凋亡抑制蛋白p53、Survivin、bcl-2表达与化疗药敏性的关系,探讨消化道肿瘤组织MDR相关因子表达能否反映肿瘤的化疗耐药性.方法:84例胃癌、大肠癌标本进行MTT法体外化疗药物敏感性实验,免疫组化染色检测组织中P-gp、p53、Survivin、bcl-2的表达,分析4种多药耐药相关因子表达与9种药物对肿瘤细胞抑制率的关系.结果:肿瘤组织中P-gp、p53、Survivin、bcl-2表达率分别为96.4%、64.3%、89.3%、60.7%;P-gp与bcl-2表达、Survivin与bcl-2表达具有正相关性(r=0.5072,r=0.3027,P<0.05).在肿瘤组织耐药因子表达程度与药物对肿瘤细胞抑制率的关系中,P-gp强表达组PIN、OXA、DDP对肿瘤细胞的抑制率明显低于弱表达组(P<0.05);p53强表达与PTX、DDP对肿瘤细胞的抑制率明显降低有关(P<0.05);Survivin强表达时,VCR、DDP对肿瘤细胞的抑制率明显降低(P<0.05).但OXA对肿瘤细胞的抑制率明显增加(P<0.01);bcl-2强表达时,5-FU、VCR、EADM、OXA对肿瘤细胞的抑制率明显低于弱表达组(P<0.05).结论:消化道肿瘤P-gp、p53、Survivin、bcl-2表达程度仅与其对部分化疗药物的耐药性有关.评价消化道肿瘤组织某种耐药因子表达与化疗药物耐药性的关系必须考虑多种因素调节的影响.     

鼻咽癌中凋亡与p53和bcl—2基因表达的关系

目的 目前，凋亡已成为肿瘤研究的热点之一，尤其基因对凋亡的调节作用已成为基因治疗和评价疗效的方向。其中以p53与bcl-2基因尤为引人注目，因而，我们研究了鼻咽癌中凋亡与p53和bcl-2基因表达的关系。材料与方法 对近年我院治疗的99例鼻咽癌病人的标本，通过免疫组化染色的方法测定突变型p53和bcl-2基因的表达情况，并于光镜下根据形态学特征确定肿瘤凋亡细胞并计算其凋亡比例。结果 我们发现p53表达-、 、 、 的病理标本分别为30、60、4和5例，其凋亡指数为0.83%、0.55%、0.37%及0.14%，各组间统计有显著差异；84例bcl-2表达-、 、 、 4组的病理标本为57、17、10和0例，其凋亡指数分别为0.61%、0.40%和0.31%，各组间差异无显著性意义，但如将bcl-2表达阳性两组“ ”、“ ”合并为阳性组后分析，则bcl-2表达阴性与阳性之间差异有显著性意义（P<0.05)。同时将p53和bcl-2基因表达分为3组；二者皆阴性，其中一者为阳性二者皆为阳性组，其凋亡指数分别为0.88%、0.52%和0.49%，双阳性与双阴组间差异有显著性意义（P<0.01)。结论 鼻咽癌中p53和bcl-2基因的表达可以降低肿瘤本底凋良心比例。尤以p53基因为明显，但二者没有协同作用。     

食管黏膜癌变过程中组织细胞增殖、凋亡和p53表达的变化

目的探讨食管黏膜癌变过程中增殖、凋亡和p53表达的变化及临床意义。方法对连续胃镜检查对象818例进行食管黏膜活检和病理组织学检查,并应用TUNEL法检测凋亡指数、免疫组织化学法检测增殖指数和p53表达。结果818例食管活检组织中,正常上皮694例,单纯增生39例,轻中度异型增生24例,食管鳞癌61例。在正常上皮→单纯增生→轻中度异型增生→鳞癌中,随分化程度的进展,凋亡指数（AI）等级逐渐降低,增殖指数（PI）等级和p53表达等级则逐渐增高,差异均有统计学意义。正常上皮中AI等级与PI和p53表达等级呈负相关,PI等级与p53表达等级呈正相关。单纯增生中AI等级与p53表达等级呈负相关,PI等级与p53表达等级呈正相关。轻中度异型增生和鳞癌中AI等级、PI等级及p53表达等级之间彼此均无相关性。结论AI等级降低,PI和p53表达等级升高是食管黏膜肿瘤性生长的特征,各病理类型本身凋亡增殖和p53表达的彼此相关性可能是制约或促进癌变的机制,这些变化可以作为食管上皮恶性变倾向的参考指标。     

膀胱移行细胞癌中p53突变、bcl-2和PCNA表达的临床意义

To correlate the frequency of p53 mutations, bcl-2 expression and the proliferation status (proliferating cell nuclear antigen, PCNA) in patients with bladder cancer with cell proliferation, apoptosis and their clinico-pathologic findings. Paraffin-embedded sections from 39 superficial (T1G1-G3) and 23 invasive (T2-T4a G3 N0M0) primary transitional cell carcinomas (TCC) in the bladder were investigated immunohistochemically for p53, bcl-2 and PCNA. The median follow-up was 37 months; 24 had recurrences. The proliferation index (PI) was expressed as a percentage of the PCNA-positive cells in the tumor cells. Apoptosis was detected by terminal deoxy-nucleotidyl transferase-mediated dUTP-biotin nick end labeling (TUNEL), and the apoptotic index (AI) was expressed as a percentage of the TUNEL-positive tumor cells. p53 mutation was identified in 50 patients (80.6%). The mutation was most common in tumors grade 3 (91.3%) as compared to grade 2 (78.5%) and grade 1 (72.7%, P<0.05). Stage pT2 tumors had a higher frequency of p53 mutation (95.7%) as compared to pTa-1 tumors (74.3%, P<0.01). Only 14 tumors (22.5%) expressed bcl-2; grade 3 tumors expressed bcl-2 significantly more frequently (P<0.05); there was no correlation between bcl-2 and tumor stage. There was no interrelation between p53 mutation and bcl-2 expression (P>0.05). The PI ranged from 17.2% to 41.8% (median 22.4%) and the AI from 1.9% to 3.5% (median 2.9%) in bladder cancer. Statistical analyses revealed a close associations between PI, AI and tumor grade and stage of bladder cancer. p53 mutation correlates with invasion. p53 and PCNA overexpression may offer valuable additional prognostic information in bladder tumors. With the progression of the tumor grade, cell proliferation may be accompanied by frequent apoptosis in bladder cancer, but the PI increased much more than the AI.     

Apoptosis in transitional cell carcinoma of bladder and its relation to proliferation and expression of P53 and Bcl-2

Transitional cell carcinoma of bladder (TCC) is a relatively common cancer among men. Tumor progression is associated with expression or modulation of several gene products that control apoptosis and proliferation. Apoptosis is a negative growth regulatory mechanism in tumors. The aim of this study is to examine apoptosis and related regulatory molecular markers in a group of patients with TCC. Paraffinembedded tissues from 49 patients with TCC were examined for the expression of bcl-2, p53 and Ki-67 by immunohistochemistry. Apoptosis was detected by TUNEL method. Correlation between apoptotic index (AI), proliferation index (PI) and bcl-2 and p53 expression with each other and with pathological grade was determined. Apoptosis was observed in 28.1% of TCC cases. The mean AI of all cases was 13.7+/-24. No correlation was found between apoptosis and differentiation status of carcinoma. Bcl-2 expression was weakly detected in only one sample. P53 expression was detected in 26 of cases with mean staining index of 102+/-96. A significant correlation between p53 and Ki-67 staining indices was observed (r=0.521, p=0.001). Both p53 and Ki-67 expression showed a good association with the pathological grade (p=0.0001 and p=0.004, respectively). None of the markers showed significant correlation with AI and no correlation was found between the ratio of AI to PI and other parameters either. In conclusion, the frequency of apoptosis in TCC of bladder appears not to be associated with tumor grade, and with bcl-2, p53 and Ki-67 expression.     

膀胱癌癌旁组织p53、bcl-2表达及其临床意义

目的　探讨膀胱癌癌旁组织的组织病理学及突变蛋白p5 3、bcl 2的表达情况 ,以提高对膀胱癌恶性程度的认识及提高对膀胱癌的疗效。方法　采用免疫组化S P法 ,对 5 8例膀胱癌标本 ,取癌组织、癌旁 2cm、癌旁 3cm以及癌旁 3cm以上组织 ;分别进行 p5 3、bcl 2检测。 结果　 5 8例膀胱癌癌旁黏膜组织中 ,正常膀胱黏膜 2 5例 ,癌旁癌变 13例 ,癌前病变 2 0例。不同病理分期及分级的膀胱癌组织 p5 3阳性表达率有非常显著性差异 (P <0 .0 1) ;浅表性膀胱癌与浸润性膀胱癌bcl 2阳性表达率比较有显著性差异 (P <0 .0 5 ) ,不同病理分级膀胱癌组织中bcl 2阳性表达有非常显著性差异 (P <0 .0 1)。结论　p5 3阳性表达、bcl 2阴性表达的膀胱癌多具浸润性强、分化较差的特点。bcl 2阳性表达、p5 3阴性表达的膀胱癌浸润性弱、分化较好。癌旁组织恶变发生率浸润性膀胱癌为 5 6.4%、浅表性膀胱癌为 2 1.1% ,提示手术时应尽可能保证足够的切除范围     

PCNA及bcl-2基因在膀胱移行细胞癌组织中的表达及其意义

目的 :探讨PCNA和bcl 2基因在膀胱癌组织中的表达及其预后意义 ,了解肿瘤增殖与凋亡的特点 ,揭示细胞凋亡和增殖在膀胱癌发生发展中的作用。方法 :采用免疫组织化学LSAB法 ,对 78例膀胱移行细胞癌组织进行PCNA和bcl 2表达的检测。结果 :在膀胱癌中 ,PCNA主要呈胞核表达 ,bcl 2呈胞质表达 ,PCNA和bcl 2染色阳性率分别为 35 9%和 5 6 4 % ;PCNA表达与膀胱移行细胞癌组织分级、预后呈正相关 (P =0 0 1,P =0 0 386 ) ,bcl 2亦与肿瘤分级、预后呈高度正相关 (P =0 0 0 0 2 ,P =0 0 116 ) ;PCNA和bcl 2表达无明显相关 (P =0 2 32 7)。结论 :PCNA和bcl 2参与膀胱癌的恶性转化、侵袭及进展的过程 ;检测PCNA和bcl 2有助于判断膀胱肿瘤恶性分化程度 ,并且二者可以作为预后的评价指标     

Chemosensitivity and p53-dependent apoptosis in epithelial ovarian carcinoma.

BACKGROUND: Although p53 gene mutation frequently is observed in ovarian carcinoma, the function of the p53 gene in chemosensitivity has not been defined conclusively. The objective of the current study was to elucidate the relation between chemotherapy-induced apoptosis through the p53 pathway and chemosensitivity to ovarian carcinoma. METHODS: Tumor samples were obtained from 24 patients with epithelial ovarian carcinoma before and after chemotherapy with cisplatin, doxorubicin, and cyclophosphamide. Mutations in the p53 gene were screened by polymerase chain reaction-single-strand conformation polymorphism analysis and determined by cycle sequencing. Expression of the p53, Bax, and bcl-2 proteins and proliferating cell nuclear antigen (PCNA) were determined by immunohistochemical staining. Apoptotic cells were detected by the terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate biotin nick-end labeling method. RESULTS: Of the 24 patients, 12 responded to chemotherapy and 12 did not. p53 gene mutation was observed in ten nonresponders and two responders. The incidence of p53 protein expression in tumors with the gene mutation was 58% (7 of 12) and was 17% (2 of 12) in tumors without the gene mutation. A significant reverse correlation between apoptotic index (AI) and labeling index (LI), determined by the percentage of PCNA positive cells, was observed in tumors after chemotherapy. AI was found to increase significantly after chemotherapy in tumors with the wild-type p53 gene (3.84 +/- 1.64 vs. 7.13 +/- 5.23) but LI did not change in either tumor type. The expression of Bax protein was significantly greater in tumors with the wild-type p53 gene after chemotherapy. bcl-2 protein expression did not relate to p53 gene status before or after chemotherapy. CONCLUSIONS: The current study suggests that p53-dependent apoptosis in tumors is strongly related to the chemosensitivity in epithelial ovarian carcinoma.     

Spontaneous apoptosis in ovarian carcinomas: a positive association with p53 gene mutation is dependent on growth fraction

Changes in cell survival contribute to tumour development, influence tumour biology and its response to chemotherapy. p53 gene alterations should negatively affect apoptosis by impaired p53-dependent apoptotic response. We looked for associations between spontaneous apoptosis, p53 gene mutation, p53 protein accumulation, growth fraction, bcl-2 expression and histological parameters in 64 ovarian, four tubal and three peritoneal carcinomas. Apoptotic cells were detected with the TUNEL method. p53 gene variants were detected by the single-strand conformation polymorphism and were sequenced directly. P53, Ki-67 and bcl-2 protein expressions were detected immunohistochemically. A weighed multiple logistic regression model was applied. Apoptotic index (AI) ranged 0.02-0.18 (mean 0.11); proliferation index (PI) ranged 3-90% (mean 54%). p53 gene mutations were present in 51, p53 protein accumulation in 46, and diffuse bcl-2 expression in 29 of 71 tumours. The AI was positively associated with the presence of p53 gene mutation (P = 0.011). However, the PI included into the analysis did positively influence the AI (P = 0.02) and diminished the association with p53 gene mutation (P = 0.082). The AI was negatively associated with good histological differentiation (P = 0.0006), the serous tumour type (P = 0.002), and diffuse bcl-2 expression (P = 0.025). Strong bcl-2 expression was associated with endometrioid tumour type (P = 0.002). FIGO stage and p53 protein accumulation were the only parameters that influenced overall survival time. Thus, our results suggest that histological tumour type and grade are major determinants of spontaneous apoptosis in ovarian carcinomas; p53 alterations do not adversely but rather positively affect spontaneous apoptosis by increasing growth fraction. This, in turn, suggests p53-independency of spontaneous apoptosis in ovarian carcinomas.     

膀胱癌癌旁组织的病理学及p53蛋白、bcl-2表达意义

 目的　探讨膀胱癌癌旁组织的病理学改变和p5 3、bcl 2基因的表达意义。方法　采用免疫组化SP法 ,对 5 8例行手术治疗的膀胱癌标本 ,分别进行 p5 3、bcl 2基因的检测。 结果　p5 3阳性表达在膀胱癌的不同病理分期及分级中具有显著性差异 (P <0 .0 1) ;bcl 2基因阳性表达在浅表性膀胱癌与浸润性膀胱癌具有差异 (P <0 .0 5 ) ,bcl 2基因阳性表达在不同病理分级中具有显著性差异 (P <0 .0 1)。结论　p5 3阳性表达、bcl 2阴性表达的膀胱癌具有恶性程度高、易复发的特点 ;癌旁组织恶变发生率 ,浸润性膀胱癌 5 6 .4 % ,浅表性膀胱癌 2 1.1% ,提示手术时尽可能保证足够的切除范围。     

Apoptosis and its correlation with proliferative activity in rectal cancer

BACKGROUND AND OBJECTIVES: Alterations in the normal control of apoptosis and cell proliferation are important factors in multistep colorectal carcinogenesis. The aim of this study was to determine the frequency of apoptosis and cell proliferation in rectal cancers and to examine their relationship to clinicopathological variables and expression of bcl-2 and p53. METHODS: Terminal deoxynucleotidyl transferase (TdT)-mediated dUTP nick end labeling (TUNEL) staining and immunohistochemical staining for Ki-67, bcl-2, and p53 were performed on paraffin-embedded tissue samples of 57 rectal cancers. RESULTS: There was a positive linear correlation between apoptotic index (AI) and proliferative index (PI) (gamma = 0.276, P = 0.038). Both apoptosis and cell proliferation were more frequently found in rectal cancers with lymph node metastasis (P = 0.045 and 0.010, respectively). However, the ratio of AI and PI was not different by nodal status. There was no association between Dukes stage and AI or PI. The frequency of apoptosis was inversely related to the expression of bcl-2, but was not related to the p53 status of rectal cancer. There were no association between cell proliferation and the expression of bcl-2 or p53. CONCLUSIONS: Our results suggest that the susceptibility to apoptosis in rectal cancer is clearly related to the proliferative activity and high turnover rate of tumor cells may contribute to lymph node metastasis.     

TgN(p53mt_LMP1)/HT小鼠鼻腔和鼻咽黏膜上皮细胞增殖与凋亡相关基因表达的关系

背景与目的： 探讨TgN(p53mt_LMP1)/HT小鼠鼻腔和鼻咽黏膜上皮癌前病变发生与细胞周期分布,凋亡相关基因bax、bcl_2和增殖相关基因PCNA的表达水平及它们与p53mt基因表达的相关关系。 材料与方法： HE染色法观察G4代12月龄TgN(p53mt_LMP1)/HT转基因阳性和阴性小鼠鼻腔和鼻咽黏膜上皮病理组织学变化,流式细胞术测定细胞周期分布特点,免疫组织化学法检测组织中p53mt、bax、bcl_2和PCNA表达水平,综合分析其相关性。 结果： 转基因阴性小鼠和阳性小鼠鼻腔或鼻咽黏膜上皮癌前病变发生率分别为0和63.64％(P<0.01)。与转基因阴性小鼠比较,转基因阳性小鼠鼻腔和鼻咽黏膜上皮组织G0/G1期细胞数量减少,S期、G2/M期细胞数量增多,细胞增殖指数增高(P均<0.01),p53mt、bcl_2和PCNA表达水平显著增高(P<0.01),bax表达水平显著降低,bcl_2/bax比值升高(P<0.01)。 结论： TgN(p53mt_LMP1)/HT转基因阳性小鼠p53mt的表达可引起bax表达抑制,bcl_2表达水平增高,bcl_2/bax比值升高,PCNA表达增强,由此导致细胞凋亡活性降低,细胞增殖活性升高,细胞转化机率增加,可能与鼻腔或鼻咽黏膜上皮癌前病变有密切关系。