Distribution of H.pylori antigens in gastric mucosa and its significance

INTRODUCTION Helicobacter pylori (H.pylori) was grouped as a class I carcinogen by the International Agency for Research on Cancer in 1994. A direct relation be-tween H.pylori infection and gastric carcinogenesis was demonstrated in 1998 in an experimental animal model (Watanabe et al., 1998). However, the role of H.pylori in human gastric carcinogenesis is sup-ported almost exclusively by epidemiological data and prospective histopathological studies. So far the mechanism of H.pylor…     

Distribution of<Emphasis Type="Italic">H. pylori</Emphasis> antigens in gastric mucosa and its significance

Objective: To investigate the distribution ofH. pylori antigens in the gastric mucosa in patients withH. pylori infection, and the relationship between the distribution and gastric cancer. Methods: Of 112 patients confirmed by pathological study to have chronic superficial gastritis, precancerous changes (chronic atrophic gastritis, intestinal metaplasia or atypical hyperplasia) and gastric cancer, 28 wereH. pylori negative and 84 wereH. pylori positive.H. pylori antigens in the gastric mucosa were detected by immunohistochemistry. Results: TheH. pylori positive group, comprised 12 of 22 (50.0%) in the chronic superficial gastritis group, 22 of 25 (88.0%) in the precancerous changes group and 13 of 35 (37.1%) in the gastric cancer group. The positive rates ofH. pylori antigens in the cytoplasm progressively increased, respectively at 0.0% (0/12), 63.6% (14/22) and 84.6% (11/13) for the same groups (χ ²=19.76,P=0.000);H. pylori antigens were located in the mucus layer and above the neck of the mucosal gland in 9 of 12 (75.0%) cases with chronic superficial gastritis, at the neck of the mucosal gland and the isthmus in 12 of 22 (54.5%) cases with precancerous changes, below the isthmus in 9 of 13 (69.2%) cases with gastric cancer (χ ²=25.30,P=0.000). In theH. pylori negative group, noH. pylori antigen was observed. Conclusion: With the progression of chronic superficial gastritis→precancerous changes→gastric cancer,H. pylori antigens progressively migrated from the outer part to the inner part of the cell, and from the superficial to the deep gastric mucosa.     

Study of serum Helicobacter pylori soluble antigen

Objective: to explore a new serological method for detecting Helicobac ter pylori ( H. pylori ) infection. Methods: Serum soluble antigen of H. p ylor i was detected by using avidin-biotin ELISA technique to evaluate the status of H. pylori infection and for comparison with rapid urease test ( RUT ), histo logi c examination and serology. Results: The sensitivity, specificity, positive pred ictive value and negative predictive value were 77.46%, 91.07%, 91.67% a nd 76.12 %, respectively. The prevalence rate of serum H. pylori soluble antigen in 138 patients undergoing endoscopy was similar to the rate obtained by 14 C-UBT met hods ( P>0.05 ). Conclusions: The detection of serum H. pylori solub le antigen( HpSAg) could be used as a new serological method which is accurate, and convenie nt, not affected by the memorizing reaction of serum antibody; is more sensitive , m ore specific and suitable for clinical diagnosis, and evaluation of eradication and for follow-up of H. pylori as well as for detection in children and pre gnant women.     

胃癌组织中bcl-2和c-myc基因表达与病理类型相关性研究

本研究应用较灵敏的SP免疫组织化学方法,对80例胃癌组织进行bcl-2、c-myc基因蛋白的检测,并对两种基因与临床病理的关系进行了研究。结果发现,bcl-2基因蛋白在胃癌的阳性率为46.3％。高、中分化腺癌阳性率为59.4％,显著高于低、未分化腺癌(37.5％);其表达与Merkel分型有关,乳头状腺癌显著高于低分化腺癌;在lauren分型中,肠型胃癌为59.4％,显著高于弥漫型(37.5％);在Ming'S分型中,膨胀型(52.3％)显著高于浸润型胃癌(23.5％)。在伴淋巴结转移的胃癌中,bcl-2的表达率(38.6％)显著低于不伴淋巴结转移者(65.2％)。c-myc基因蛋白在胃癌的阳性率为67.5％,其表达率在低、未分化腺癌中为72.5％,显著高于粘液腺癌(25.0％);而粘液结节型腺癌(25％)明显低于粘液细胞型腺癌(81.8％)和管状腺癌(71.4％)。在膨胀型胃癌的表达率(73.0％)显著高于浸润型(47.1％)。c-myc的表达率与淋巴结转移明显关系。bcl-2、c-myc基因表达与患者性别、年龄、肿瘤发生部位、浸润深度无明显相关性。     

Purification and relationship with gastric disease of a 130 kDa (CagA) protein of Helicobacter pylori

Objective: The aims of this research were to purify and identify the 130 kDa (CagA) protein of H. pylori clinical isolate HP97002 and evaluate the relationships between the purified 130 kDa (CagA) protein and gastric diseases. Methods: The procedure for isolating the protein included 6 mol/L guanidine extract, size exclusion chromatography and elusion from gel. Sera of 68 patients with gastric diseases (44 with chronic gastritis,15 with atrophic gastritis,7 with peptic ulcer disease,2 with gastric cancer ) were obtained, and the serological response to CagA was studied by Western-blot using the purified protein. Results: The purified protein was 130 kDa and preserved good antigenicity and revealed basic isoelectric point about of 8.1. Among 68 sera, 43 sera could recognize the purified protein associated with chronic gastritis 47.7% (21/44),atrophic gastritis 86.7% (13/15),peptic ulcer disease 100% (7/7),gastric cancer 100% (2/2). Compared with each other, the difference was significant (χ2=13.327, P=0.004), and 130 kDa (CagA) protein was associated with severe gastric diseases (rs=0.442, P=0.001). Conclusion: The 130 kDa (CagA) protein was associated with severe gastric diseases.     

Purification and relationship with gastric disease of a 130 kDa (CagA)protein of Helicobacter pylori

ＩＮＴＲＯＤＵＣＴＩＯＮＨｅｌｉｃｏｂａｃｔｅｒｐｙｌｏｒｉｉｎｆｅｃｔｉｏｎｈａｄｂｅｅｎｒｅｃｏｇ ｎｉｚｅｄａｓａｎｉｍｐｏｒｔａｎｔｃａｕｓａｔｉｖｅｆａｃｔｏｒｉｎｃｈｒｏｎｉｃｇａｓｔｒｉｔｉｓａｎｄｐｅｐｔｉｃｕｌｃｅｒｄｉｓｅａｓｅ (ＰＵＤ     

雌激素受体与P53蛋白在胃癌表达的相关性研究

目的:探讨ER与P53蛋白在胃癌中表达的相关性。方法:对119例胃癌标本进行石蜡切片和S-P免疫组织化学染色。结果:ER与P53在胃癌中的表达率分别为66.39％(79/119)和68.07％(81/119),ER与P53蛋白表达呈正相关(rs=0.513)。结论:ER与P53蛋白在胃癌的发生、发展过程中具有互相促进和互相调节的作用。     

Expression of three essential antioxidants of Helicobacter pylori in clinical isolates

Objective

Helicobacter pylori maintains long-term persistence in the host and combats oxidative stress via many antioxidant proteins, which are expected to be relevant to bacterial-associated gastric diseases. We aimed to investigate the expression of three essential antioxidants in H. pylori strains isolated from patients with different clinical outcomes. Methods: Forty H. pylori strains were isolated from endoscopic biopsy specimens of gastric mucosa from 13 patients with gastric cancer, 13 with peptic ulcer, and 14 with gastritis. The expression of thioredoxin 1 (Trx1), arginase (RocF), and alkyl hydroperoxide reductase (AhpC) in H. pylori was measured by real-time PCR. Comparisons among multiple sample sets were analyzed using a one-way ANOVA test. Pearson’s correlation test was used to assess relationships among multiple continuous variables.

Results

Trx1 expression of H. pylori in gastric cancer and peptic ulcer tissues was higher than that in tissues with gastritis. RocF expression of H. pylori in gastric cancer tissues was higher than that in tissues exhibiting peptic ulcer and gastritis. However, we did not find any differences in AhpC expression in samples from patients with different clinical outcomes. The expression of Trx1 and RocF had a positive, linear correlation. The expression of Trx1 and AhpC had a positive correlation without a linear trend. We found no correlation between the expression of RocF and AhpC.

Conclusions

Our observations indicate that the expression of Trx1 and RocF in H. pylori might be related to gastric carcinogenesis. In H. pylori, the expression of members of the antioxidant system may be correlated and relevant to gastric cancer.     

Comparative proteome analysis of Helicobacter pylori clinical strains by two-dimensional gel electrophoresis

Objective  

To investigate the pathogenic properties of Helicobacter pylori by comparing the proteome map of H. pylori clinical strains.     

Science Letters: Quantification of Helicobacter pylori levels in soil samples from public playgrounds in Spain

Helicobacter pylori are ubiquitous Gram-negative bacteria with a high estimated level of infection in the world populations, but a majority of the infected persons are asymptomatic. This pathogen has been classified by the World Health Organization as a class I carcinogen and recognized as the causal agent of most peptic ulcers and chronic gastritis that might lead to stomach cancer. Although not all the transmission pathways of these bacteria into humans have been properly identified, enough data have sugg...     

Study on the serum levels of soluble intercellular adhesion molecule-1 (sICAM-1) in patients with Helicobacter pylori Infection

Objective: To evaluate the interaction between serum levels of soluble intercellular adhesion molecule-1 (sICAM-1) and Helicobacter pylori (H. pylori) infection in patients with chronic gastritis and peptic ulcer. Methods: The serum levels of sICAM-1 in 205 patients with chronic gastric diseases were detected by ELISA method and the status of H. pylori was determined by histologic examination, RUT, 14C - UBT, and serology. The sera obtained from 18 healthy volunteers served as controls. Results: The serum levels of sICAM-1 were significantly higher in patients with H. pylori positive than those of H. pylori negative (889.43±32.52 ng/ml vs. 747.07±30.45 ng/ml, P<0.05). The serum levels of sICAM-1 in patients with mild, moderate and severe infection of H. pylori were 841.68±72.36 ng/ml, 905.43±37.59 ng/ml and 1012.54±49.34 ng/ml,respectively (P<0.05). The serum levels of sICAM-1 proved to be significantly correlated with the density of H. pylori colonization in gastric mucosa (rs =0.316, P<0.001). The serum levels of sICAM-1 in patients with chronic gastritis and peptic ulcer were significantly higher than those in healthy controls (P<0.05). Conclusions: These results indicated that H. pylori infection up-regulates the expression of sICAM-1.     

热休克蛋白7O在乳腺癌和胃癌中的表达及其意义的研究

目的：探讨热休克蛋白70（HSP70）在人乳腺癌和胃癌中的表达及其意义。方法：应用免疫组织化学的方法对64例乳腺癌和55例胃癌组织中的HSP70进行检测。结果：（1）HSP70在乳腺癌和胃癌组织中的表达分别为78．13％．61.82％。（2）乳腺癌中HSP70的表达与乳腺癌的病理类型．淋巴结转移情况及年龄未发现显著差异（P〉0．05）。（3）胃癌中HSP70的表达与肿瘤浸润深度、淋巴结转移有密切关系（P〈0．05）。结论：HSP70在乳腺癌和胃癌中均呈较高水平表达．其中在胃癌中的表达与肿瘤浸润深度、恶性程度有密切关系,HSP70在乳腺癌和胃癌的发生发展中起重要作用。HSP70可能成为乳腺癌，胃癌的诊断指标之一。     

Comparative features of colorectal and gastric cancers with microsatellite instability in Chinese patients

Objective  

The purpose of this study was to determine the unique and universal features of microsatellite instability-high (MSI-H) colorectal cancer (CRC) and MSI-H gastric cancer (GC) in the Chinese population.     

Study on the serum levels of soluble intercellular adhesion molecule-1 (sICAM-1) in patients with Helicobacter pylori Infection

ＩＮＴＲＯＤＵＣＴＩＯＮＳｉｎｃｅｔｈｅｆｉｒｓｔｓｕｃｃｅｓｓｆｕｌｉｓｏｌａｔｉｏｎｏｆＨ .ｐｙ ｌｏｒｉｉｎ 1 982 ,Ｈ .ｐｙｌｏｒｉｉｎｆｅｃｔｉｏｎｈａｓｂｅｅｎｆｏｕｎｄｔｏｂｅａｓｓｏｃｉａｔｅｄｗｉｔｈｖａｒｉｏｕｓｄｉｓｅａｓｅｓｉｎｃｌｕｄｉｎｇｃｈｒｏｎｉｃｇａｓｔｒｉｔｉｓ,ｐｅｐｔｉｃｕｌｃｅｒｄｉｓｅａｓｅｓ(Ｄｏｏｌｅｙｅｔａｌ.,1 989;Ｇｒａｈａｍｅｔａｌ.,1 992 ) ,ａｎｄｇａｓｔｒｉｃｎｅｏｐｌａｓｍｓ(Ｂａｙｅｒｄｏｒｆｆｅｒｅｔａｌ.,1 995) .Ｉｔｗａｓｓｕｇｇｅｓｔ…     

任鸿隽论科学精神及其意义

作为中国现代科学发展和科学建制化过程中的重要人物,任鸿隽一生致力于宣扬和传播科学,他对于科学精神从本质、特征、体现等方面作了全面深入的论述,并试图以此达到改造学界的目的.     

论中介的本质及其辩证法意义

中介具有三重的辩证法意义。其一 ,事物是互为中介而联为一体的 ,因而中介是普遍联系得以实现的联系环节 ;其二 ,事物的对立双方相互渗透而发生变化 ,因而中介是运动变化得以实现的过渡阶段 ;其三 ,中介是质变发展得以实现的转化条件。发展是辩证法的核心 ,因而作为转化的条件是中介的本质。中介的辩证法意义特别是它的本质意义在人与自然的关系演变中表现得尤为明显     

High expression of FABP4 in colorectal cancer and its clinical significance

Objective:To investigate the relationship between the fatty acid-binding protein 4(FABP4)and colorectal cancer(CRC).Methods:Using an enzyme-linked immunosorbent assay(ELISA),we measured the expression of FABP4 in plasma of50 patients who underwent surgery for CRC from October 2017 to May 2018 and 50 healthy controls.The content of the visceral fat area(VFA)as seen with abdominal computed tomography(CT)scanning was measured by ImageJ software.The expression levels of FABP4,E-cadherin,and Snail proteins in CRC and adjacent tissues were determined by immunohistochemistry.Results:The mean concentration of plasma FABP4 of CRC patients was higher than that of the control group(22.46 vs.9.82 ng/m L;P<0.05).The concentration of plasma FABP4 was related to the tumor,node,metastatis(TNM)stage and lymph node metastasis and was independent of age,body mass index(BMI),tumor size and location,and the degree of differentiation of CRC.The concentration of plasma FABP4 was positively correlated with high VFA and lipoprotein-a(LPA)(P<0.05);but it was not correlated with total cholesterol(TG),total triglyceride(TC),low-density lipoprotein(LDL),high-density lipoprotein(HDL),or apolipoprotein AI(Apo-AI).The expression of FABP4 protein in CRC tissues was positively correlated with the degree of CRC differentiation,tumor stage,and lymph node metastasis.The level of FABP4 protein was negatively correlated with E-cadherin protein(r=-0.3292,P=0.0196)and positively correlated with Snail protein(r=0.5856,P<0.0001).Conclusions:High LPA and VFA were risk factors for increased plasma FABP4 in CRC patients.FABP4 protein was highly expressed in CRC tissues and associated with TNM stage,differentiation,and lymph node metastasis of CRC.The level of FABP4 in CRC tissue was correlated with E-cadherin and Snail expression,suggesting that FABP4 may promote CRC progression related to epithelial-mesenchymal transition(EMT).     

MMP-9和CD15s与胃癌血管生成的相关性研究及其临床意义

目的:探讨基质金属蛋白酶9(MMP-9)和唾液酸化Lewis X(CD15s)抗原与胃癌侵袭转移的相关性。方法:采用CD105,MMP-9,CD15s进行免疫组化S-P法染色,对47例胃癌根治性切除手术标本病理组织切片进行标记,检测CD105的微血管密度(MVD),并对MVD与MMP-9、CD15s的关系进行统计分析。结果:MMP-9、CD15s表达都呈阳性的胃癌组织微血管密度高于MMP-9和CD15s单阳性及二者均阴性的胃癌组织。结论:MMP-9高表达有利于癌组织局部浸润,CD15s高表达有利于癌细胞血行转移,MMP-9及CD15s检测对临床诊治胃癌及判断预后具有一定意义。     

H.26L中对 H.263建议的主要算法改进及其分析

继制定了 H.261、 H.263、 H.263+ 等视频压缩标准后 , ITU-T正在制定新的视频压缩标准 H.26L, 目的是为了取得更好的图像压缩效果和更多的实用功能 . 本文对 H.26L的关键模块及主要原理进行分析 , 并将其与 H.263、 H.263+ 进行比较 , 归纳出 H.26L的主要特点和优点 , 证实其能达到更高效的压缩能力 .     

nm23在食道癌、胃肠癌组织中的表达及其意义

目的:探讨nm23在食道癌、胃肠癌发展中的作用及其意义。方法:应用S-P免疫组织化学方法检测nm23基因在39例食道癌、39例胃癌、42例肠癌标本中的表达。结果:无淋巴结转移组nm23阳性表达率显著高于淋巴结转移组,且nm23低表达与癌的浸润深度有关;与患者的性别、癌的分化程度等生物学行为无关。结论:食道癌、胃肠癌nm23低表达者具有较强的浸润转移能力,nm23可作为预测食道癌、胃肠癌转移及预后的临床指标。