• 생약학회지
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• 제33권1호통권128호
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• pp.13-17
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• 2002

Helicobacter pylori infection is associated with type B gastritis, peptic ulcer, and gastric cancer. The vacuolation of cells induced by H. pylori is thought to be essential for the initiation and maintenance of gastric infection. The roles of H. pylori cytotoxin, urease, and ammonia in the vacuolation of HeLa cells were determined. Ammonium chloride augmented the neutral red uptake induced by H. pylori toxin. Acetohydroxamic acid (AHA) failed to block the neutral red uptake induced by H. pylori toxin. Leweifang significantly prevented the vacuolation of HeLa cells induced by H. pylori toxin or H. pylori toxin and ammonium chloride. Further investigation is required to determine the mechanisms of Leweifang for the inhibition of vacuole formation of eukaryotic cells in response to the H. pylori toxin.

• Asian Pacific Journal of Cancer Prevention
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• 제16권5호
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• pp.1751-1758
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• 2015

There has been a strong, positive correlation between opisthorchiasis-associated cholangiocarcinoma and infection with Helicobacter. Here a rodent model of human infection with Opisthorchis viverrini was utilized to further investigate relationships of apparent co-infections with O. viverrini and H. pylori. A total of 150 hamsters were assigned to five groups: i) Control hamsters not infected with O. viverrini; ii) O. viverrini-infected hamsters; iii) non-O. viverrini infected hamsters treated with antibiotics (ABx); iv) O. viverrini-infected hamsters treated with ABx; and v) O. viverrini-infected hamsters treated both with ABx and praziquantel (PZQ). Stomach, gallbladder, liver, colonic tissue, colorectal feces and O. viverrini worms were collected and the presence of species of Helicobacter determined by PCR-based approaches. In addition, O. viverrini worms were cultured in vitro with and without ABx for four weeks, after which the presence of Helicobacter spp. was determined. In situ localization of H. pylori and Helicobacter-like species was performed using a combination of histochemistry and immunohistochemistry. The prevalence of H. pylori infection in O. viverrini-infected hamsters was significantly higher than that of O. viverrini-uninfected hamsters ($p{\leq}0.001$). Interestingly, O. viverrini-infected hamsters treated with ABx and PZQ (to remove the flukes) had a significantly lower frequency of H. pylori than either O. viverr-iniinfected hamsters treated only with ABx or O. viverrini-infected hamsters, respectively ($p{\leq}0.001$). Quantitative RT-PCR strongly confirmed the correlation between intensity H. pylori infection and the presence of liver fluke infection. In vitro, H. pylori could be detected in the O. viverrini worms cultured with ABx over four weeks. In situ localization revealed H. pylori and other Helicobacter-like bacteria in worm gut. The findings indicate that the liver fluke O. viverrini in the biliary tree of the hamsters harbors H. pylori and Helicobacter-like bacteria. Accordingly, the association between O. viverrini and H. pylori may be an obligatory mutualism.

• 동의생리병리학회지
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• 제26권3호
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• pp.381-385
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• 2012

We investigated the eradication rate and the adverse effects of combined treatment with western and oriental medication on Helicobacter pylori infected patients. We studied the eradication rate and the adverse effects of 1-week-triple therapy and 2-week-oriental medication(Banhasasimtang or Hyangsapeungeuysan) on Helicobacter pylori infected patients confirmed by urea breath test. Comparing 5 patients who took combined treatment with western and oriental medication, the results of this study showed that 4 patients got eradication effect of Helicobacter pylori with no influence on liver and kidney function. A patient had diarrhea and another patient had satiety after meals because of an adverse effect. Despite some possitive effect, the treatment did not make the Quality of Life improved. The findings of this study supports the adverse effects of combined treatment with western and oriental medication for the treatment of Helicobacter pylori infection.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2000년도 추계학술발표대회 및 bio-venture fair
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• pp.264-265
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• 2000

Helicobacter pylori(H. pylori) is the causative agent of chronic gastritis and the single most important factor in peptic ulcer disease, however, the pathogenetic mechanisms underlying H, pylori infection are not well understood. Futhermore, there is a strong association between H. pylori infection and gastric cancer. Various diagnostic methods for detecting H. pylori infection are available. These can be divided into invasive methods, requiring endoscopy, and non-invasive tests, mainly 13C-urea breath tests and serologic detection of antibodies. Rapid urease test is the most recommendable endoscopic test for the diagnosis of H. pylori infection, presently. CLO test kit is the represent of rapid urease test kits. The principles of CLO test kit is that hydrolysis of urea by urease Is detected by a dye indicators showing a color change. Our device is used same principle but we improved the reaction time is more faster and positive color change is more distinctive from the color of the negative specimen. So, this kit is more reliable because it response faster and accuracy.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제5권2호
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• pp.129-135
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• 2002

목 적: 철분 결핍에 노출되기 쉬운 사춘기 소아에서 H. pylori 감염과 철 결핍성 빈혈의 상관 관계를 알아보고자 하였다. 방 법: 혈색소, 혈청 철, 총 철 결합능, 혈청 페리틴, H. pylori에 대한 변역글로붙린 G 항체를 937명(남자 475명, 여자 462명)을 대상으로 측정하였다. 이들의 연령은 10세에서 18세였다. H. pylori 감염의 유병률은 빈혈, 저 페리틴혈증, 철 결핍, 철 결핍성빈혈 유무에 따라 두 군으로 비교하였다. 또한 H. pylori 감염 유무에 따라 혈색소, 혈청 철, 총 철 결합능, 트랜스페린 포화도, 혈청 페리틴의 농도를 비교하였다. 결 과: 빈혈, 철 결핍, 철 결핍성 빈혈, H. pylori 감염에 대한 각각의 유병률은 8.1%, 9.1%, 3.1%, 20.8%였다. 빈혈, 저 페리틴혈증, 철 결핍 각각의 군에서 H. pylori 감염율은 34.2%, 29.5%, 35.3% 이었고, 빈혈이 없는 군에서는 H. pylori 감염률이 19.6%, 저 페리틴혈증이 없는 군은 19.2%, 철 결핍성 빈혈이 없는 군은 19.4%이었다. H. pylori 감염율은 철 결핍성 빈혈군에서 44.8%, 정상군에서 20.0%이었다. 혈색소와 철분 농도는 유의한 차이가 없었지만 혈철 페리틴 농도는 H. pylori 감염군에서 유의하게 감소하였다. 결 론: H. pylori 감염은 사춘기 청소년에서 철결핍과 관련있을 것으로 생각된다.

• Journal of Gastric Cancer
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• 제10권4호
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• pp.168-174
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• 2010

Purpose: Infection with Helicobacter pylori is an important risk factor for gastric cancer in humans. We compared the clinicopathologic features of gastric cancer patients based on H. pylori infection. Materials and Methods: We prospectively studied 155 patients who had gastric cancer and underwent gastrectomies in 1 hospital in Korea. We examined H. pylori infections using the rapid urease test (RUT) with gastrectomy specimens and collected clinical and pathologic data. Results: The number of H. pylori infections based on the RUT was 137 (88%). The H. pylori-negative group was significantly associated with AGC and tumor histology. H. pylori infection was significantly correlated with type I/IIa in EGC and type III/IV/V in AGC. AGC was significantly correlated with larger tumor size, lymphatic invasion, perineural invasion, and H. pylori infection based on univariate and multivariate analyses. Conclusions: We report the prevalence of H. pylori based on the RUT in gastric cancer patients. H. pylori infection influences the tumor histology, progression, and growth type of gastric cancer.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제4권2호
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• pp.161-166
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• 2001

목적: 침대를 함께 사용하고 밀집된 공간에서 생활하는 것이 H. pylori 감염을 일으키는 의미 있는 위험 인자로 알려져 있다. 저자들은 훈련을 위해 합숙해야 하는 청소년 운동선수들에서 H. pylori 감염의 유병률을 조사하고 이를 일반 학생들과 비교해 보고자 하였다. 방법: 일반 고등학교 440명(남학생 228명과 여학생 212명)과 체육 고등학교의 운동 선수 220명(남학생 148명과 여학생 72명)을 대상으로 정맥 채혈과 설문지를 통한 조사가 이루어졌다. 첫째, 일반 학생과 운동 선수들의 H. pylori 감염의 유병률을 비교하기 위해 H. pylor에 대한 혈청 IgG 항체를 검사하였다. 둘째, H. pylori 감염에 영향을 미칠수 있는 위험 인자를 비교하기 위해 두 군간의 섭취하는 음식에 대한 영양 분석과 사회 경제적인 상태에 대한 설문지 조사가 시행되었다. 결과: 1) 육상 선수들의 H. pylori 감염의 유병률(43.2%)이 대조군(22.7%)에 비해 의미있게 높았다. 2) 두 군간에 영양섭취 및 Hollingshead 지표, 주택소유 여부, 혼잡지표 등의 사회경제적인 상태의 의미있는 차이는 없었다. 3) 다변량 회귀분석상 학교의 차이와 혼잡지표가 H. pylori 감염에 영향을 주는 유의한 인자였다. 결론: 훈련 캠프의 합숙생활이 청소년 운동 선수들에서 H. pylori 감염을 일으키는 의미있는 위험 인자가 될 수 있다.

• Journal of Preventive Medicine and Public Health
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• 제41권6호
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• pp.373-379
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• 2008

Objectives ; The objective of this study was to evaluate the prevalence of atrophic gastritis and intestinal metaplasia according to gender, age and Helicobacter pylori infection in a rural population in Korea. Methods: Between April 2003 and January 2007, 713 subjects (298 men and 415 women, age range: 18-85) among the 2,161 adults who participated in a population-based survey received gastrointestinal endoscopy. All the subjects provided informed consent. Multiple biopsy specimens were evaluated for the presence of atrophic gastritis and intestinal metaplasia. The presence of Helicobacter Pylori was determined using CLO and histology testing. Results ; The age-adjusted prevalence of atrophic gastritis was 42.7% for men and 38.1% for women and the prevalence of intestinal metaplasia was 42.5% for men and 32.7% for women. The prevalence of atrophic gastritis and intestinal metaplasia increased significantly with age for both men and women (p for trend<0.001). The age-adjusted prevalence of Helicobacter pylori was similar for men (59.0%) and women (56.7%). The subjects with Helicobacter pylori infection showed a significantly higher prevalence of intestinal metaplasia (44.3%) compared with that (26.8%) of the noninfected subjects (p<0.001). However, the prevalence of atrophic gastritis was not statistically different between the Helicobacter pylori-infected subjects and the noninfected individuals. Conclusions : Our findings suggest that the prevalence of atrophic gastritis and intestinal metaplasia is higher for a Korean rural population than that for a Western population; this may be related to the high incidence of gastric cancer in Koreans. Especially, the prevalence of intestinal metaplasia was high for the subjects with Helicobacter pylori infection. The multistep process of gastric carcinogenesis and the various factors contributing to each step of this process need to be determined by conducting future follow-up studies.

• 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.

• 대한임상검사과학회지
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• 제42권1호
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• pp.38-45
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• 2010

The aim of this study was to assess the Clinical Usefulness of Helicobacter pylori Stool Antigen (HpSA) immunochromatographic assay for the diagnosis of H. pylori infection. In this study, we had compared HpSA-immunochromatographic assay with CLO test and UBT test. From a total of 140 patients (M:F=88:52) with upper endoscopy, biopsy specimens were obtained for CLO test. Stool specimens was collected from all patients and tested using a HpSA-immunochromatic assay. H. pylori infection status was defined as infected if the results of both CLO test and UBT test were positive. CLO test and UBT test findings showed that 92 patients were H. pylori positive and 48 patients were H. pylori negative. According to this definition, the sensitivity, specificity, and positive or negative predictive value (PPV, NPV) of HpSA-immunochromatographic assay were 97.8%, 100%, 100%, and 96%, respectively. Cross reactivity test of HpSA-immunochromatographic assay were performed with 10 enteric bacteria strains in fecal habitat, and there were no false positive reaction. We evaluated the usefulness of HpSA assay for eradication therapy with 10 of 92 H. pylori positive patients, positive results of them at pre-eradication therapy were converted to negative at post-eradication. The HpSA-immunochromatographic assay is a highly sensitive and specific non-invasive diagnostic method for detection of H. pylori infection, a useful diagnostic method for H. pylori in post eradication stage.