• Asian Pacific Journal of Cancer Prevention
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• 제14권12호
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• pp.7355-7358
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• 2013

Several lines of evidence support the notion that MUC1 is often aberrantly expressed in gastric cancer, and it is a ligand for Helicobacter pylori. Genetic variation in MUC1 gene may confer susceptibility to H. pylori infection and gastric cancer. We assessed the association of common polymorphisms in MUC1 gene with H. pylori infection and non-cardia gastric cancer using an LD-based tag SNP approach in north-western Chinese Han population. A total of four SNPs were successfully genotyped among 288 patients with non-cardia gastric cancer and 281 age- and sex-matched controls. None of the tested SNPs was associated with H. pylori infection. SNP rs9426886 was associated with a decreased risk of non-cardia gastric cancer, but lost significance after adjustment for multiple testing. Overall, our data indicated that common genetic variations in MUC1 gene might not make a major contribution to the risk of H. pylori infection and non-cardia gastric cancer in our studied population.

• Asian Pacific Journal of Cancer Prevention
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• 제15권22호
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• pp.9905-9908
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• 2014

Background: Helicobacter pylori (H. pylori) is the most common chronic infectious agent in the stomach. Most importantly, it may lead to atrophy, metaplasia and cancer. The aim of this study was to investigate the incidence of H. pylori infection and to detect early mucosal changes that may lead to malignant degeneration in children. Materials and Methods: Children who underwent upper gastrointestinal endoscopy were included. Familial history of gastric cancer was noted. Endoscopic examinations were performed by a single pediatric gastroenterologist. A minimum of three biopsy samples were collected during endoscopy. The patients were accepted as H. pylori infected if results of biopsies and rapid urease test were both positive. Biopsies were evaluated for the presence and degree of chronic inflammation, the activity and severity of gastritis, glandular atrophy and intestinal metaplasia. Results: A total of 750 children (388 boys, 362 girls) were evaluated in our study, with a mean age of 10.1 years. A total of 390 patients (52%) were found to be infected with H. pylori. Among the H. pylori infected patients, 289 (74%) were diagnosed to have chronic superficial gastritis, 24 (6.2%) had gastric atrophy. Most strikingly, intestinal metaplasia was observed in 11 children, all were in the H. pylori positive group. There was no difference in the mean of age, gender and socioeconomic class between H. pylori infected and non-infected groups. The frequency of gastric cancer in family members (4 in number) was higher in patients with H. pylori infection. No gastric cancer case was reported from the parents of non-infected children. The worst biopsy parameters (atropy and metaplasia) were improved after H. pylori eradication on control endoscopy. Conclusions: The current study shows a higher prevalence of familial history of gastric cancer in H. pylori infected children. Intestinal metaplasia was also higher in the infected children. Eradication of H. pylori infection for this risk group may prevent subsequent development of gastric cancer.

• Journal of Gastric Cancer
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• 제3권2호
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• pp.97-103
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• 2003

Purpose: This study aims to determine the infection rate of Helicobacter pylori (H. pylori) in gastric cancer patients who received gastrectomies, and to compare the rates of H.pylori infection detected by serological test and that of histopathological test, and to evaluate its clinical meaning. Materials and Methods: Fifty two patients were selected from those who underwent gastrectomies at the Department of Surgery, Samsung Medical Center, from March 1997 to May 1997. The control group consisted of healthy 103 persons visited the center for health promotion in Samsung Medical Center. In both groups, we quantitatively checked serum level of IgG anti H. pylori antibody titer by ELISA using GAP IgG test kit (BioRad, USA) for the serological test, and we microscopically examined the surgical specimen stained by Warthin-Starry silver staining method for the histopathological test. Results: The seropositive rate of H. pylori in the patients' group was $71.2\%$ (37/52), and the control group was $65.0\%$ (67/103). The difference between two groups was statistically significant. However the histopathological study showed that the overall detection rate of H. pylori was $61.5\%$ (32/52) in the patients' group and $61.2\%$ (63/103) in the control group; nd this difference was not statistically significant Conclusion: We could confirm that H.pylori infection rate in the gastric cancer resected patients was statistically higher than in the normal healthy persons even in small population. And the detection method for the H. pylori infection by serological test was presumed to be better than that of histopathological test using surgical specimen. Further study for the larger population by well-organized multicenters will be needed.

• 대한수의학회지
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• 제46권4호
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• pp.327-335
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• 2006

A stable and reliable Helicobacter pylori (H. pylori) infection animal model would be necessary for evaluating vaccine efficacy and helpful for understanding the pathological mechanism of the organism. The aim of the present study is to investigate the effect of ethanol treatment prior to H. pylori inoculation on associated gastric mucosal injury and to establish ethanol-pretreating animal model to study H. pylori infection. Male Mongolian gerbils were used for the study. H. pylori was orally inoculated after 12 h fasting. 3 h prior to H. pylori inoculation, a group of gerbils was orally treated with absolute ethanol, 60% and 40% ethanol respectively. Another group of animals was treated either with H. pylori culture media alone or with different concentrations of ethanol plus culture media. Gerbils were killed 4 or 8 weeks after H. pylori inoculation. The colonization of H. pylori was confirmed by both histological examination and rapid urease test. Mucosal damage was evaluated grossly and histologically according to the criteria. The colonization of H. pylori and pathological changes in gastric mucosa of the animals were also observed. Although no significant change to the gastric mucose was observed in the animals treated either with H. pylori culture media alone or with different concentrations of ethanol plus culture media, persistent H. pylori infection was seen in the mucosa and mucosal leucocyte infiltration and severe epithelial damage was observed in the Helicobacter and ethanol + Helicobacter groups after 4 weeks. The gross and histological scores were higher in the ethanol + Helicobacter than in the Helicobacter alone group. As the results, ethanol-pretreatment with 60% concentration induced severe pathogenic changes by H. pylori infection in 5 weeks-old Mongolian gerbils. These results suggested that ethanol-pretreatment before H. pylori inoculation could increase the severity of gastric mucosal inflammation and enhance the colonization of H. pylori. The established ethanol-pretreating animal model would contribute to screen new drugs against H. pylori and be used as an useful tool for various animal experiments with H. pylori strains.

• Nutritional Sciences
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• 제9권3호
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• pp.152-158
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• 2006

Helicobacter pylori (H. pylori) infection rapidly stimulated either COX-2 or 5-LOX and released arachidonic acid metabolites that have been considered as pivotal mediators in H. pylori-induced inflammatory responses. To determine whether red ginseng extract (RGE) can suppress the biosynthesis of 5(S)-hydroxyeicosatetraenoic acids (HETE), a precursor metabolite of leukotrienes B4 (LTB4) in H. pylori-provoked inflammatory responses in gastric epithelial cells, the biosynthesis of monohydroxy fatty acids was measured using radioactive arachidonic acid and validated by RP-HPLC using non-radioactive AA as substrate in AGS cells cocultured with H. pylori (ATCC 43504) with or without pretreatment of RGE. Among three known major HETEs, H. pylori infection specifically induced the biosynthesis of $^{14}C-5(S)-HETE$ rather than the complex of $^{14}C-15S-/^{14}C-12(S)-HETE$ from $^{14}C-AA$, concomitantly obtained by HPLC(p<0.01). RGE, 1 to $100{\mu}g/ml$, selectively suppressed H. pylori-stimulated $^{14}C-5(S)-HETE$ production implying the attenuation of 5-lipoxygenase activity, of which was similar to known LOX inhibitor NDGA $(10{\mu}M)$ (p<0.01). However, the amount of 5(S)-HETE was significantly reduced by higher dose of RGE $(100{\mu}g/ml)$ (p<0.05). These results indicated that LOX pathway might be one of principle pathogenic mechanisms of H. pylori and red ginseng could be a nutraceutical against H. pylori infection through inhibiting action of LOX activity.

• Journal of Applied Biological Chemistry
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• 제54권4호
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• pp.265-269
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• 2011

뽕잎으로부터 분리한 H. pylori 억제물질이 건강기능식품으로 산업화되기 위하여 이들 유용성분이 생체 내에서 약리성을 가지는지 여부를 검토하였다. 청목노상으로부터 분리한 혼합물은 $200{\mu}g/100{\mu}L$의 농도에서 H. pylori에 대한 저해 clear zone을 형성하여 항균활성을 나타내었고, C57BL/6종 mouse에 H. pylori의 감염을 유도 한 결과 6주 이상이 되어야 H. pylori의 감염이 되는 것을 확인하였으며, 이 때 감염균수는 평균 $8{\times}10^5$ CFU/mL이었다. 경구투여를 통해 청목노상뽕잎에서 추출한 유효성분의 혼합물이 H. pylori 감염에 있어 예방 및 치료 효과를 갖는지 시험한 결과, 절개된 위속의 H. pylori colony 수가 약물투여 군에서 대조군에 비해 감소한 것을 확인하였다. 마우스의 혈청을 분리하여 immunoglobulin isotype을 측정한 결과, 대조군 보다 IgG1, IgA 등이 높게 생성되는 것이 확인되었고, 시료 혼합물에 의해 항체생성이 증가되어 H. pylori 감염을 억제하는 것으로 판단되었다. 이러한 결과로 뽕잎에서 추출한 유용성분인 caffeic acid, rosemarinic acid와 chlorogenic acid가 H. pylori의 감염에 있어서 예방 또는 치료효과가 있는 것으로 확인되었다. 따라서 H. pylori에 의해 유발되고 감염률이 증가되고 있는 위염, 위궤양, 위암의 예방과 치료가 가능할 것으로 판단되었다.

• Asian Pacific Journal of Cancer Prevention
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• 제16권13호
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• pp.5219-5223
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• 2015

Helicobacter pylori (H. pylori) infection as a serious problem in both adults and children can induce chronic gastritis, peptic ulcer disease (PUD), and possibly gastric cancer. The aim of the current study was to survey antibiotic resistance and also to determine influence of PPAR$\gamma$ polymorphism in patients with H. pylori infection. During an 11-month-period, 98 H. pylori isolates were collected from 104 biopsy specimens. In vitro susceptibility of H. pylori isolates to 4 antimicrobial agents metronidazole, clarithromycin, amoxicillin and tetracycline were assessed by quantitative method according to European Committee on Antimicrobial Susceptibility Testing (EUCAST) guideline. PPAR$\gamma$ polymorphism was determined using polymerase chain reaction-restriction fragment length polymorphism assay. The frequency of H. pylori infection in our study was 94.2%. In vitro susceptibility data showed that highest level of resistance was related to metronidazole (66.3%), and the majority of H. pylori isolates were highly susceptible to amoxicillin and tetracycline (94.9% and 96.9%, respectively). Genotypic frequencies were 25.5% for CC (Pro12Pro), 40.8% for GC (Pro12Ala) and 33.7% for GG (Ala12Ala). In our study, CG genotype had highest distributions among infected patients with H. pylori. The study suggests that the PPAR-$\gamma$ Pro12Ala polymorphism could be evaluated as a potential genetic marker for susceptibility to gastric cancer in the presence of H. pylori infection.

• Journal of Oral Medicine and Pain
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• 제33권1호
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• pp.9-14
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• 2008

Helicobacter pylori(H. pylori)는 위 십이지장 궤양 및 위암의 발생과 관련되어 있으며, 감염은 대부분 유년기에 발생되어 나이가 먹어감에 따라 증가한다. 감염경로에 있어서 구강은 매우 중요한 역할을 하기 때문에 소아의 타액에서 H. pylori의 발현율을 조사하여 감염경로를 규명하기 위해 위장관과 관련된 증상 및 전신질환이 없는 10세 이하 20명과 10대 20명의 실험군과 20세 이상 71명의 대조군을 대상으로 연구하였다. 10세 미만에서 5명(25%), 10대에서 6명(30%) 그리고 20세 이상 17명(23.9%)에서 H. pylori가 타액에서 검출되었다. 실험군과 대조군간의 검출율 비교에 있어서 차이는 없었다(P>0.05). 이상의 결과를 종합해 볼 때 건강한 한국인 소아의 타액 내에서 H. pylori는 비교적 흔히 존재하며, 구강이 H. pylori 감염에 근원이 될 수 있음을 추론할 수 있다.

• Asian Pacific Journal of Cancer Prevention
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• 제17권9호
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• pp.4469-4475
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• 2016

Indonesia is a developing country, in most of which the infection rates of Helicobacter pylori (H. pylori) have been reported to be high. However, the prevalence of H. pylori infection in Indonesia has been unexpectedly reported to be low. The purpose of our study was to confirm whether the prevalence of H. pylori infection is low among healthy inhabitants in Northern Jakarta by 13C-urea breath test (UBT), and to examine the association of their lifestyle/environmental factors with H. pylori infection and to identify potential routes of transmission. We recruited a total of 196 subjects from a low-income community in Northern Jakarta, Indonesia. Of them, 193 subjects who completed a questionnaire about their lifestyle/environment and had UBT were included in this study. Odds ratios (ORs) adjusted for sex and age with 95% confidence intervals (CIs) were calculated using logistic regression model. The overall H. pylori infection rate was 15.0%. There was difference in H. pylori infection rates among Buginese (40.0%), Betawi (9.1%), Sundanese (3.7%), and Batak (9.1%). After multivariate analysis, the ORs of intake of soybean milk, cucumber more than one time a week, infrequent hand washing before meals, and alcohol consumption were 0.10 (95%CI: 0.01-0.97), 6.61 (95%CI: 1.87-23.3), 4.10 (95%CI: 1.15-14.6), and 61.9 for former drinkers (95%CI: 1.67-2300.8), respectively. Buginese (OR=7.84; 95%CI: 1.82-33.8) and Batak ethnic groups (OR=20.1; 95%CI: 1.90-213.2) were infected more frequently, compared with Javanese. The H. pylori infection rate in this study was low, as reported previously. After we scrutinized the factors, Buginese and Batak ethnic groups eat food using fingers more frequently than Javanese, Betawi, and Sundanese. In addition, infrequent hand wash practice before meal increased the risk. Our study indicated that person-person transmission was possible in this low prevalence area. The low infection rates of H. pylori among those of Javanese, Betawi, and Sundanese ethnicity could be partly due to sanitary practice.

• 한국식품과학회지
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• 제36권5호
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• pp.779-783
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• 2004

P. pentosaceus CBT SL4균이 생산하는 항균물질 농축건조물은 H. pylori균에 대하여 평판 및 액상배양 조건에서 생육억제 활성이 확인되었고, 사막모래쥐를 사용한 감염실험에서는 감염방어 및 제균작용이, 보균자 인체실험에서는 제균작용이 확인되었다. 최근 3제 요법이나 신규 약물 등에 의하여 자각증세가 있는 위염증 환자에서의 제균율은 크게 향상되었으나, 국내의 경우에는 전체국민의 감염율이 매우 높은 것과 식습관 등의 요인에 의하여 단체 및 사회생활을 통한 신규감염이나 재감염을 방어할 효과적 수단은 없는 상태에 있다. 따라서, 일상적인 섭취가 가능하고, 병원균의 내성개발 우려나 인체에 대한 부작용이 없으며, H. pylori균에 대한 감염방어 및 제균작용을 동시에 지닌 유산균 및 그 항균활성물질을 이용한 식품소재는 국민전체의 H. pylori 감염율을 낮추고, 신규감염과 재감염의 악순환을 방지하기 위한 유용한 방어수단이 될 수 있을 것으로 판단된다. 한편, 유산균 배양액에 의한 H. pylori균에 대한 생육억제 현상은 모든 유산균에서 보편적인 현상은 아닌 것으로서 특정한 균주의 배양액에서만 관찰되고 있어 단순히 젖산 등 유기산에 의한 효과로 보기에는 어려움이 있으며 Gram 음성의 병원균들은 외막의 보호작용에 의하여 분자량이 큰 박테리오신 성분에 의해서는 생육이 억제되지 않는 것으로 판단되고 있다. 저자들은 당 균주가 생성하는 H. pylori 생육 억제 물질을 산성의 저분자 물질로 추정하고, 물질 및 작용기작 규명을 위하여 활성물질의 분리 및 구조분석 작업을 진행 중에 있으며, 이러한 연구가 완료되면 분리정제 물질을 활용한 추가적인 산업화 용도 개발이 가능할 것으로 기대하고 있다.