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  • 1
    ISSN: 1432-0509
    Keywords: Liver, neoplasms ; Hepatocellular carcinoma, diagnosis, ultrasound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Fifty-four lesions of small hepatocellular carcinoma under 5 cm in diameter detected by real-time sonography were reviewed to characterize the sonographic feature. Twenty-nine lesions were smaller than 3 cm in diameter and 25 were between 3 and 5 cm in diameter. Sonographic characteristics of hepatocellular carcinoma were peripheral hypoechoic halo (52%), lateral shadow (26%), posterior acoustic enhancement (44%), and mosaic pattern (24%) of the mass. Small tumors less than 3 cm in diameter showed a hypoechoic pattern in half of the cases, whereas most of the tumors between 3 and 5 cm in diameter showed a hyperechoic or mixed pattern. Posterior acoustic enhancement was commonly seen in small tumors less than 3 cm in diameter, while a mosaic pattern was commonly seen in large tumors between 3 and 5 cm in diameter. These results suggest that sonography might be useful for the characterization of small hepatocellular carcinoma.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0509
    Keywords: Liver neoplasms ; Liver neoplasms, diagnosis ; Liver neoplasms, computed tomography ; Liver neoplasms, ultrasound ; Liver neoplasms, angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Eighty-six hepatocellular carcinomas (HCCs) in 67 patients were examined by intraoperative sonography. Sensitivity for detecting tumors with intraoperative sonography was compared with sonography, computed tomography (CT), hepatic angiography, and CT after intraarterial injection of iodized poppy-seed oil (Lipiodol-CT). The overall sensitivities were 76% with sonography, 86% with CT, 89% with angiography, 96% with Lipiodol-CT, and 98% with intraoperative sonography. The differences in sensitivity between intraoperative sonography and sonography (p 〈 0.01), CT (p 〈 0.01), and angiography (p 〈 0.05) were significant. In 35 lesions smaller than 2 cm, the sensitivities of Lipiodol-CT and intraoperative sonography were high (91 and 94%, respectively). In operating field, tumors were invisible in 36 (42%) and nonpalpable in 31 of 86 cases (36%). In 35 tumors smaller than 2 cm, invisible tumors were 66% and nonpalpable tumors were 63%. However, 84 of 86 cases (98%) could be localized with intraoperative sonography. These results suggest that intraoperative sonography is the final diagnostic imaging procedure before surgical resection of tumors and in cases of invisible and nonpalpable tumors in the operating field, this procedure is mandatory to improve surgical results.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1523-5378
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background. Nitric oxide (NO) generated by nitric oxide synthase (NOS) is known to be an important modulator of the mucosal inflammatory response. In this study, we questioned whether Helicobacter pylori infection could up-regulate the epithelial cell inducible NOS (iNOS) gene expression and whether NO production could show polarity that can be regulated by immune mediators.Materials and Methods. Human gastric epithelial cell lines were infected with H. pylori, and the iNOS mRNA expression was assessed by quantitative RT-PCR. NO production was assayed by determining nitrite/nitrate levels in culture supernatants. To determine the polarity of NO secretion by the H. pylori-infected epithelial cells, Caco-2 cells were cultured as polarized monolayers in transwell chambers, and NO production was measured.Results. iNOS mRNA levels were significantly up-regulated in the cells infected with H. pylori, and expression of iNOS protein was confirmed by Western blot analysis. Increased NO production in the gastric epithelial cells was seen as early as 18 hours postinfection, and reached maximal levels by 24 hours postinfection. The specific MAP kinase inhibitors decreased H. pylori-induced iNOS and NO up-regulation. After H. pylori infection of polarized epithelial cells, NO was released predominantly into the apical compartment, and IL-8 was released predominantly into basolateral compartment. The addition of IFN-γ to H. pylori-infected polarized epithelial cells showed a synergistically higher apical and basolateral NO release.Conclusion. These results suggest that apical NO production mediated by MAP kinase in H. pylori-infected gastric epithelial cells may influence the bacteria and basolateral production of NO and IL-8 may play a role in the tissue inflammation.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1435-5922
    Keywords: Key words: apoptosis ; cytokine ; gastric epithelial cells ; Helicobacter pylori ; virulence factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract: The cytotoxin-associated gene (cagA) and vacuolating cytotoxin (Vac) production have been reported to be major virulence factors of Helicobacter pylori. However, there have been some disputes regarding the correlation between these virulence factors and clinical outcomes. We evaluated whether the cagA-positive genotype and Vac production might be cor-related with various gastroduodenal diseases in Korea and whether this correlation could be due to differences in proinflammatory cytokine gene expression and apoptosis of gastric epithelial cells in vitro. The presence of the cagA gene was examined by the polymerase chain reaction (PCR), and Vac production was detected using the bacterial culture supernatant and HeLa cells after H. pylori was isolated from Korean patients. Gastric epithelial cells were infected with cagA +Vac+, cagA +Vac−, or cagA −Vac− strains, after which cytokine gene expression was evaluated, using quantitative reverse transcription (RT)-PCR. Apoptosis and caspase-3 activation were measured in H. pylori-infected gastric epithelial cells. There was no significant correlation between the presence of these virulence factors in H. pylori isolates and peptic ulcer or gastric cancer. Upregulation of cytokine gene expression, including that of interleukin (IL)-1α, IL-8, granulocyte macrophage colony-stimulating factor (GM-CSF), and monocyte chemotactic protein (MCP)-1, as well as apoptosis and caspase-3 activation, were similar in infections with cagA-positive and cagA-negative strains, but were not correlated with the production of Vac. These results suggest that the lack of correlation between virulence factors of isolated H. pylori strains and serious gastroduodenal disease entities in Korea may be due to the similar capacity for proinflammatory cytokine gene expression and apoptosis caused by infection with each of the H. pylori strains.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of gastroenterology 35 (2000), S. 552-556 
    ISSN: 1435-5922
    Keywords: Key words: hepatocellular carcinoma ; spontaneous regression ; recurrence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract: The prognosis of untreated hepatocellular carcinoma (HCC) is usually grave, although there have been a few case reports of spontaneous regression. Tumor recurrence after spontaneous regression has been rarely reported, and there have been no previous reports of recurrent hepatocellular carcinoma after spontaneous regression. Two cases of hepatocellular carcinoma that spontaneously regressed and subsequently recurred are presented. The patients' tumors spontaneously regressed, as reflected by the radiologically evidenced reduction in tumor size and markedly decreased alpha-fetoprotein levels. Subsequent tumor recurrences after regression were evidenced by radiologic findings of newly growing nodules and appreci-ably increased alpha-fetoprotein levels. To the authors' knowledge, these two patients represent the first reported cases of hepatocellular carcinoma recurrence after spontaneous regression. In both of these patients, new hepatocellular carcinomas recurred at different sites before the spontaneous regression of the original HCCs was complete. Although the precise causes of the regression and the subsequent recurrence remain to be further investigated, this phenomenon suggests that multicentric hepatocarcinogenicity and intratumoral events in each hepatocellular carcinoma nodule may be involved.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1573-2568
    Keywords: apoptosis ; cyclooxygenase-2 ; gastric epithelial cells ; Helicobacter pylori ; prostaglandin E2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Helicobacter pylori induces apoptosis and alters the proliferation of gastric mucosal epithelial cells. Cyclooxygenase-2 (COX-2), the inducible form of prostaglandin (PG) synthesis, is known to cause alteration in epithelial cell growth. The goal of this study was to determine whether COX-2 gene expression by H. pylori infection could influence gastric epithelial cell apoptosis. Expression of COX-2 mRNA and proteins was up-regulated in Hs746T gastric epithelial cell lines infected with H. pylori, when assessed by quantitative RT-PCR and western blot. Inhibition of COX-2 expression using NS-398, a specific COX-2 inhibitor, showed a significant increase of gastric epithelial cell apoptosis and caspase-3 activation in Hs746T cells infected with H. pylori. Moreover, the effect of NS-398 on H. pylori-induced apoptosis was reversed by the addition of PGE2. These results suggest that up-regulated COX-2 expression by H. pylori infection can inhibit apoptosis of gastric epithelial cells.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1573-2568
    Keywords: Helicobacter pylori ; intestinal metaplasia ; eradication ; duodenal ulcer ; gastric ulcer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study was conducted to investigate whether or not the eradication of H. pylori could lead to the regression of intestinal metaplasia (IM) in patients with either duodenal ulcer (DU) or benign gastric ulcer (BGU). The initial antral IM grade was 0.21 in the 72 patients of the H. pylori-eradicated DU group, this decreased to 0.17, 0.14, 0.13, and 0.09 after periods of four weeks, one year, two years, and four years, respectively, but without statistical significance. In the corpus of the DU group, where IM grade was low (0.02), there was no detectable change in IM. The initial antral IM grade of 0.69 in the 41 patients of the H. pylori-eradicated BGU group decreased substantially to 0.61, 0.44, and 0.39 after periods of four weeks and one and two years, respectively, but again without statistical significance. The initial corporal IM grade of the BGU group of 0.27 decreased to 0.20, 0.15, and 0.06 after periods of four weeks and one and two years, again without statistical significance. In contrast, the IM grades of the noneradicated DU group (N = 20) and the BGU group (N = 16) showed nearly no change in the antrum and corpus. Gastritis grades of antrum and corpus in the H. pylori-eradicated DU or BGU group significantly decreased with respect to time (P = 0.0001), but there were no significant changes in the corresponding noneradicated groups. Although there was no statistical significance, IM decreased in the antrum and corpus of the stomach with BGU and in antrum of those with DU over a two to four-year period after H. pylori eradication, suggesting the possible reversibility of IM.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-2568
    Keywords: Helicobacter pylori ; neutrophil ; chemokine ; quantitative RT-PCR ; calcium ; myeloperoxidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To elucidate the mechanisms of the persistent neutrophil recruitment in H. pylori-infected gastric mucosa, we evaluated the activation of human neutrophils and CXC chemokine expression in neutrophils by H. pylori water-soluble surface proteins. H. pylori water extract (HPWE) was prepared from a supernatant of the H. pylori suspension in distilled water. After neutrophils were stimulated with HPWE, the mobilization of intracellular free calcium, the expression of lymphocyte function-associated antigen-1β, and the secretion of myeloperoxidase (MPO) were enhanced in the neutrophils. In H. pylori-infected gastric mucosa, transendothelial and transepithelial migration of neutrophils were observed by electron microscopy and mucosal MPO levels were elevated. Up-regulation of the expression of interleukin-8 (IL-8) and growth-related oncogenes (GROs; GROα, GROβ and GROγ) mRNA and protein in neutrophils by HPWE was demonstrated by quantitative reverse transcription–polymerase chain reaction and enzyme-linked immunosorbent assay, respectively. In conclusion, H. pylori-induced neutrophil recruitment may be mediated by CXC chemokines which are expressed by neutrophils activated by H. pylori water-soluble surface proteins.
    Type of Medium: Electronic Resource
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