胃癌组织中Bcl-2、p53蛋白表达及分析

采用免疫组化法检测Bcl-2和p53蛋白在胃癌组织中的表达.发现:Bcl-2和p53蛋白在正常胃黏膜组织不表达;Bcl-2在高分化腺癌和重度不典型增生的阳性表达率明显高于中、低度分化腺癌和中、轻度不典型增生组织,p53在重度不典型增生及低分化腺癌阳性表达率均明显高于中、轻度不典型增生和中重度分化腺癌.胃癌淋巴结转移组Bcl-2阳性率明显低于无淋巴结转移组,p53阳性率明显高于无淋巴结转移组.二者的表达呈显著负相关.认为Bcl-2和p53通过细胞凋亡参与肿瘤的发生、发展的不同价段,对判断胃癌的预后有一定的参考价值.     

疣状胃炎、胃癌组织中幽门螺杆菌感染与p53、p21蛋白表达

目的 探讨疣状胃炎与幽门螺杆菌（HP）及胃癌的相关性.方法 对经胃镜确诊的疣状胃炎41例、慢性浅表性胃炎21例、胃癌20例患者进行p21、p53蛋白及HP检测.结果 疣状胃炎、胃癌组HP感染率分别为60.98%和60%（P＞0.05）,均高于慢性浅表性胃炎组28.57%（P＜0.05）;p21蛋白在胃癌及疣状胃炎组中的表达率分别为45%和39%（P＞0.05）,均高于慢性浅表性胃炎组0%（P＜0.05）;p53在胃癌及疣状胃炎组中的表达率为55%和24.4%（P＜0.05）,均高于慢性浅表性胃炎组0%（P＜0.05）;疣状胃炎组HP感染阳性者中p53、p21表达阳性率分别为40%和56%,均显著高于HP感染阴性组（P＜0.05）.结论 HP感染与疣状胃炎发病相关.HP感染、ras基因激活、野生型p53基因突变参与了疣状胃炎向胃癌转化的过程.     

幽门螺杆菌感染与老年胃癌及癌前病变PCNA、Bcl-2、p16蛋白表达的关系

目的　探讨幽门螺杆菌 ( Hp)感染老年胃癌及癌前病变患者增殖细胞核抗原 ( PCNA)、p1 6和关键性凋亡调节基因 Bcl- 2蛋白的表达。方法　免疫组化方法测定 PCNA、Bcl- 2、p1 6蛋白表达。快速尿素酶法和 HE染色检测 Hp感染。结果　从浅表性胃炎到胃癌 PCNA指数呈递增趋势 ,各组间均有显著性差异 ( P<0 .0 5)。浅表性胃炎和萎缩性胃炎组中 Hp阳性患者与 Hp阴性者的 PCNAL I相比有显著性差异 ( P<0 .0 5)。Hp阳性组肠上皮化生、异型增生组织中 Bcl- 2的阳性表达率显著高于 Hp阴性组 ( P<0 .0 5)。 p1 6在慢性胃炎中阳性表达率显著高于胃癌、肠上皮化生和异型增生 ( P<0 .0 5)。 Hp阳性萎缩性胃炎组织的 p1 6阳性表达率低于 Hp阴性组 ( P<0 .0 5)。结论　在老年胃癌发生的早期即存在 p1 6基因表达低下 ,PCNA、Bcl- 2蛋白表达增加     

胃癌组织中bcl-2、p53蛋白的表达

研究表明,在胃上皮细胞损伤和癌变过程中,细胞凋亡的异常发挥了重要的作用[1],许多基因参与细胞凋亡的调控,包括ｐ53对细胞凋亡的促进作用和ｂｃｌ2对细胞凋亡的抑制作用[2]。近年来,对ｂｃｌ2基因和ｐ53基因已作了大量的研究,但对它们在胃癌发生发展过程中相互关系以及确切机理尚无定论。本研究应用免疫组织化学方法(ＳＰ法)检测ｐ53、ｂｃｌ2蛋白的表达,对44例胃癌组织和22例癌旁组织及20例胃炎组织标本进行检测,以探讨其在胃癌发生及发展过程中的作用。材料和方法一、临床资料本研究收集经病理组织学确定的胃癌组织标本44例,癌旁组织标本…     

幽门螺杆菌感染、p53和VEGF表达水平与胃癌的关系

目的探讨幽门螺杆菌感染、p53和血管内皮生长因子(VEGF)表达水平与胃癌发生、发展的关系;方法收集120例威海市立二院消化科行胃镜检查的门诊及住院患者的胃组织样本和血液样本,其中胃癌组78例,不典型黏膜组25例、正常黏膜组17例;分别采用病理WarrthinStarry银染和ELISA方法观察不同黏膜组织中幽门螺杆菌感染情况,免疫组化方法观察组织中p53和VEGF的表达情况;结果胃癌组、不典型黏膜组幽门螺杆菌感染、p53和VEGF阳性表达率均明显高于阴性患者(P0.05),各组幽门螺杆菌感染阳性患者p53和VEGF阳性表达率明显高于阴性患者(P0.05);结论胃癌与幽门螺杆菌感染存在一定相关性,p53和VEGF可调控细胞凋亡,对胃癌的发生、发展可能起到一定的促进作用。     

幽门螺杆菌感染与胃癌及癌前病变中c-myc、p53、c-erbB-2及bcl-2蛋白表达关系的研究

目的 观察胃癌、癌前病变中幽门螺杆菌(Hp)感染情况及其与c-myc、p53、c-erbB-2、bcl-2在胃癌及癌前病变中的表达关系,探讨Hp在胃癌、癌前病变发生及发展中的作用以及探索从癌前病变到癌变过程中的基因变化规律.方法 放大内镜及超声内镜检查收集103例胃黏膜标本,用免疫组织化学染色方法检测Hp感染及不同组织间c-myc、p53、c-erbB-2、bcl-2的表达.结果 c-myc、p53、c-erbB-2和bcl-2阳性表达率在胃癌组及癌前病变组中呈过度表达,与正常对照组相比有显著性差异(P<0.05).此外,Hp感染组c-myc、p53、c-erbB-2及bcl-2同时表达者为5例(9.4%);与无Hp感染组相比有显著性差异(P<0.01).结论 胃癌及癌前病变中组织存在c-myc、p53、c-erbB-2、bel-2多个表达,与Hp感染密切相关.     

胃黏膜癌前病变中p53、p21^ras蛋白表达与幽门螺杆菌感染的关系

目的观察幽门螺杆菌(Helicobacterpylori)感染及根除H.pylori二年后p53、p21ras在二组胃黏膜上皮细胞的表达,探讨H.pylori在胃癌发生、发展中的作用.方法应用免疫组织化学染色、尿素酶快速试验(RUT)、组织学Warthin-Starry染色.198例H.pylori感染患者,慢性胃炎86例,慢性胃炎伴肠化生67例,慢性胃炎伴异型增生45例;对照组为根除H.pylori 2年后共86例,其中慢性胃炎54例,慢性胃炎伴肠化生32例,慢性胃炎伴异型增生10例.全部病例做p53、p21ras免疫组织化学染色.结果 H.pylori感染组p53、p21 ras 阳性表达率15.7%、18.7%,明显高于H.pylori根除组2.3%、7%,差异显著(P＜0.05);慢性胃炎伴肠化病变中,p53、p21ras在H.pylori感染组阳性表达率17.9%、18.4%均高于H.pylori根除组0%、9.4%,差异显著(P＜0.05)慢性胃炎伴异型增生病变中,p53、p21 ras在H.pylori感染组阳性表达率31.1%、40%均高于H.pylori根除组20%、30.4%,差异显著(P＜0.05);H.pylori 感染组p53、p21ras在慢性胃炎,肠化生,异型增生表达水平依次增高p53、p21ras共同表达阳性37例.结论在胃黏膜癌前病变中p53、p21ras 在H.pylori感染组阳性表达率高于H.pylori根除组,差异显著(P＜0.05);在慢性胃炎,肠化生,异型增生p53、p21ras表达水平在增高;p53、p21 ras表达呈正相关;H.pylori感染在胃癌发生、发展过程中起一定作用,p53、p21ras表达可能是H.pylori致癌的作用机理之一.     

肺癌组织中p53和Bcl-2蛋白表达与血管新生的关系

有关肿瘤血管新生与凋亡之间的关系目前尚不清楚，本研究通过免疫组化法，探讨肺癌组织中p53、Bcl-2蛋白的表达与血管新生的关系，现将结果报告如下。     

幽门螺杆菌感染胃癌癌旁组织p53、p16和bcl-2基因的表达

目的:研究幽门螺杆菌(H·pylori)感染胃粘膜病变抑癌基因(p53、p16)和关键性凋亡调节基因bcl-2蛋白的表达,进一步探讨H·pylori在胃癌发生发展过程中作用的分子机制。方法:胃镜、外科手术中取40例胃癌患者的癌组织、癌旁组织(靠近癌的正常组织)各两块,石蜡包埋。切片HE染色作病理及免疫组织化学检查p53、p16、bcl-2蛋白表达。H·pylori阳性由CLOtest结合病理染色/~(14)C尿素呼吸试验而确定。结果:p53阳性表达率在H·pylori阳性及阴性胃癌组之间无显著性差别(p>0.05)。H·pylori阳性组慢性胃炎或肠化中p16阳性表达率及阳性表达强度均显著低于H·pylori阴性组(p<0.05,p<0.01)。而H·pylori阳性组肠化中bcl-2阳性表达率及阳性表达强度均显著高于H·pylori阴性组(pall<0.05)。结论:在胃癌发生的早期即存在较明显的p16基因表达低下与bcl-2基因过度表达,并与H·pylori感染有一定的关系。p53基因过度表达是胃癌发展过程中较晚期事件,与H·pylori感染无明显相关性。     

Relationship between Helicobacter pylori CagA status and colorectal cancer

OBJECTIVES: Infection with Helicobacter pylori, particularly with strains positive for CagA protein, increases the risk of gastric adenocarcinoma. Few studies have explored the possible association between H. pylori infection and colorectal cancer. This study evaluated whether the seroprevalence of CagA in H. pylori-infected patients affected risk for colorectal cancer independently of H. pylori status. METHODS: In this study, we tested serum IgG antibodies against H. pylori (ELISA) and CagA protein (Western blot assay) in 67 patients with colorectal adenocarcinoma, 36 with gastric adenocarcinoma, 47 with other malignancies (cancer controls), and 45 hospitalized for transesophageal echocardiography (TEE controls). Colonic cancer and gastric cancer patients with H. pylori infection were compared to each control group and to the pooled controls using simple and adjusted analyses. RESULTS: H. pylori infection was noted in 50 colon cancer patients, 31 gastric cancer patients, 31 cancer controls, and 32 TEE controls. In all, 41 (82%), 29 (94%), 11 (35%), and 13 (41%), respectively, of these H. pylori-positive sera expressed CagA reactivity (p < 0.001 for all pairwise comparisons between cases and controls). In the adjusted analysis, infection with H. pylori CagA+ compared to H. pylori CagA- was associated with increased risk for colorectal adenocarcinoma (odds ratio = 10.6; 95% CI = 2.7-41.3; p = 0.001) and gastric adenocarcinoma (odds ratio = 88.1; 95% CI = 6.3-1229.2; p = 0.001). CONCLUSIONS: Among patients infected with H. pylori, CagA+ seropositivity is associated with increased risk for both gastric and colonic cancer. This finding should stimulate additional research into the role of cagA+ H. pylori infection in the development of colorectal cancer.     

p53 expression in gastric mucosa with Helicobacter pylori infection

Expression of p53 was examined immunohistochemically in the Japanese monkey model with Helicobacter pylori infection of the gastric mucosa to investigate the association between H. pylori infection and gastric carcinogenesis for a period of 4 years. In the course of these observations, from 3 years after H. pylori inoculation, nuclear staining for p53 was seen in the glandular cells of the mucosa infected with H. pylori, especially in the neck region of the glands. There was a gradual increase in the number of immunopositive cases among the infected animals. Three years after inoculation, three out of six cases, and 4 years after inoculation, four out of six cases exhibited positive staining for p53. Before inoculation, and up to 2 years after inoculation, the infected group showed no immunoreaction for p53. The non-infected group likewise displayed no immunostaining for p53 through 4 years of observation. These results suggest that p53 alterations occur in the H. pylori-infected gastric mucosa and that H. pylori infection may play an important role in gastric carcinogenesis.     

Prognostic significance of Bcl-2 and p53 expression in gastric cancer

Background and aims Apoptosis regulates cell death and influences cell proliferation and therefore may play an important role in development or growth of various malignant tumors. The Bcl-2 and p53 are closely linked in the regulation of apoptosis. We investigated the prognostic significance of Bcl-2 and p53 expression in patients with gastric cancer.Patients and methods Immunohistochemistry was used to study Bcl-2 and p53 expression in 308 consecutive patients with gastric cancer.Results Bcl-2 expression was positive in 39 patients (12.7%) and showed a significant negative correlation with depth of invasion and lymph node metastasis. p53 expression was observed in 105 patients (34.1%) and was significantly associated with depth of invasion, lymph node metastasis, distant metastasis, and intestinal type. Patients with Bcl-2⁺ tumors showed a trend to better 5-year survival rate (81%) than those with Bcl-2^– negative tumors (71%). The 5-year survival rate in p53 positive cases (60%) was significantly lower than that in p53-negative cases (78%). In addition, p53 expression showed a significantly poorer prognosis in both diffuse and intestinal types. In multivariate analysis restricted to patients with R0 resection p53 expression was an independent prognostic factor (relative risk: 2.063). In combined assessment of p53 and Bcl-2 expression the group with p53⁺/Bcl-2^– tumors showed significantly worse 5-year survival (57%) than the other groups, while best survival was seen in the group with p53⁺/Bcl-2⁺ tumors (100%).Conclusion p53 expression is an unfavorable prognostic factor in gastric cancer. Bcl-2 expression may have possible prognostic value when combined with p53 expression.     

CagA and VacA Helicobacter pylori antibodies in gastric cancer.

BACKGROUND: Infection with different genotypes of virulent Helicobacter pylori strains (cytotoxin-associated gene A [CagA]- and/or vacuolating cytotoxin A [VacA]-positive) can play a role in the development of atrophic gastritis, duodenal ulcer (DU) and gastric cancer (GC). OBJECTIVE: To determine whether patients with GC and H pylori-negative histological staining had previously been infected with H pylori CagA- and/or VacA-positive virulent strains. METHODS: Twenty-three GC patients with a mean (+/- SD) age of 68.14+/-9.8 years who tested H pylori-negative on histological staining took part in the study. Three control groups were included. The first group comprised 19 patients with past H pylori infection and DUs eradicated 10 years earlier, with a mean age of 58+/-18.2 years. H pylori-negative status for this group was determined every year with Giemsa staining, and follow-up testing occured 120+/-32 months (mean +/- SD) after therapy. The subsequent control groups included 20 asymptomatic children, with a mean age of 7+/-4.47 years, and with H pylori-negative fecal tests; the final group contained 30 patients without clinical symptoms of H pylori infection, with a mean age of 68+/-11.6 years, who tested H pylori-negative by histological staining. RESULTS: Prevalence of CagA and VacA seropositivity, respectively was 82.6% and 73.91% in GC patients; 84.2% and 84.2% in H pylori-negative DU patients; 25% and 5% in H pylori-negative children; and 36.6% and 16.6% in the patients without clinical symptoms on histological staining. CagA and VacA antibody positivity was not significantly different between GC patients and patients with DUs that had been eradicated 10 years earlier. Significant positivity was found between the children's group and the H pylori-negative (with past DUs) group (P<0.001). A statistically significant difference was found in age between groups (P<0.03). CONCLUSIONS: Patients with GC, even when H pylori-negative at the time of the present study, may have been infected by H pylori before the onset of the disease, as confirmed by CagA and VacA seropositivity. These data reinforce the hypothesis that H pylori may be a direct carcinogenic agent of GC.     

幽门螺杆菌感染与胃癌组织p16基因变异的关系

目的：探讨幽门螺杆菌（Hp)感染与胃癌组织p16基因变异的关系。方法43例胃癌患者的新鲜癌手术标本、相应的癌旁正常组织及血清标本为本组研究对象,分别采用PCR及银染PCR－SSC癌组织p16基因的纯合性缺失及突变情况;幽门螺杆菌感染状况通过PCR及血清学试验确定。结果（1）43例胃癌中,Hp阳性30例,阳性率为69．77％,其中CagA阳性24例,阳性率为80％。（2）30例Hp阳性胃癌中,有12例发生p16基因变异,发生率为40％;13例Hp阴性胃癌中,4例p16基因发生变异,发生率为30．77％,Hp阳性组与阴性组相比较p16基因变异率差异无显著性（P＞0．05）。（3）30例Hp阳性胃癌中,CagA阳性与阴性组p16基因变异率分别为41．67％（10．24）及33．33％（2／6）,两组变异率比较差异无显著（P＞0．05）。结论Hp及CagA阳性Hp感染与胃癌组织p16基因变异无显著相关性,Hp感染可能不是其改变或必须因素。     

Seropositivity against Helicobacter pylori CagA in Turkish gastric cancer patients

BACKGROUND: Increased prevalence of CagA in gastric cancer has been reported; yet, other reports suggest that the cagA gene is not associated with gastric cancer. GOALS: To evaluate the frequency of CagA seropositivity in Turkish patients with gastric cancer. STUDY: Thirty-two patients with gastric adenocarcinoma and 46 patients with nonulcer dyspepsia were examined for Helicobacter pylori status and for antibodies against CagA. RESULTS: H. pylori was positive in 56.3% of patients and in 71.7% of controls. CagA was positive in all patients in the study group, regardless of H. pylori positivity, and in 56.5% of the control group. CagA positivity in H. pylori -positive patients was significantly more frequent in patients with gastric cancer than in those with nonulcer dyspepsia ( p < 0.001). As for H. pylori -negative patients in both groups, CagA positivity was also more frequent in gastric cancer patients ( p < 0.001). CONCLUSION: Testing for H. pylori antibodies without testing for antibodies against CagA will miss patients with either recent or previous infection, which may be a cause of missing the relationship between H. pylori and gastric cancer. The authors think that testing for CagA in patients with dyspepsia can reveal which patients should be followed up for the risk of developing gastric cancer.     

Helicobacter pylori infection affects the expression of PCNA, p53, c-erbB-2 and Bcl-2 in the human gastric mucosa.

OBJECTIVE: Helicobacter pylori infection has been related to gastric carcinogenesis. This association is based on epidemiological data, pathological changes observed in the gastric mucosa, and chemical products from bacteria that may induce damage of DNA. In the present study we examined gastric endoscopic biopsies from patients with chronic gastritis, with and without H. pylori infection, and surgical biopsies from gastric cancer patients to evaluate whether this bacteria may induce changes in the expression of molecular markers associated with carcinogenesis. PATIENTS AND METHODS: the study involved 57 biopsies from the antral region of the stomach of patients with chronic gastritis and gastric cancer that were analyzed by immunohistochemistry. Molecular markers examined were: PCNA (Proliferating Cell Nuclear Antigen), p53, c-erbB-2, Bcl-2, and p21 H-ras. RESULTS: PCNA content of epithelial cells was significantly higher in H. pylori infected biopsies. Treatment aimed to eradicate H. pylori decreased the level of PCNA-positive cells in the group of patients that became H. pylori-negative as well as in H. pylori-positive patients. Nuclear p53 expression (used here as a surrogate marker for p53 mutation/inactivation) and c-erbB-2 expression were observed only in the group of patients that remained with the bacteria after treatment. A higher bcl-2 expression in lymphoid cells was observed in H. pylori-positive biopsies, and treatment did not change the expression of this protein. No significant expression of p21 H-ras was observed in the studied biopsies. CONCLUSION: this study suggests that H. pylori is involved in the induction of molecular changes that might predispose human gastric mucosa cells to pre-neoplastic and neoplastic events.