• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제12권2호
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• pp.140-149
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• 2009

목 적: H. pylori는 소아기에 감염되어 대부분 무증상으로 지내나 소수에서 위장질환을 일으킨다. 정확한 기전은 아직 밝혀지지 않았으나 세균의 병독성 인자, 숙주 인자, 환경 인자가 복합적으로 작용한다. 소아에서 H. pylori 유전형과 임상질환의 연관성은 지역과 인종에 따라 다양하고 위점막 림프구에 관한 연구도 일치된 보고가 없다. 이에 H. pylori 감염 소아에서 H. pylori 유전형과 위점막 림프구의 상관성을 알아보고자 하였다. 방 법: H. pylori 감염 소화궤양군 10명과 H. pylori 감염 위염군 15명에서 채취된 후 냉동보관 되었던 위전정부 생검 조직에서 DNA를 분리하고 cagA, cagE, vacA, babA2의 특이적인 시발체로 중합효소연쇄반응을 시행하여 H. pylori 유전형을 분석하였다. 유전형과 임상질환, 조직 소견 및 위점막 림프구의 상관성을 비교하였다. 결 과: H. pylori 유전형 중 cagA 양성률은 80%, cagE 양성률은 60%였다. vacA는 s1m1이 84%, s1m2가 16%였으며 babA2 양성률은 88%였다. 가장 흔한 유전형 조합은 cagA+/vacA s1m1+/babA2+ 조합으로 68%에서 관찰되었다. cagA, cagE, vacA, babA2의 유전형에 따른 임상질환과 조직 소견 및 CD3, CD4, CD8 T세포 수와 CD20 B세포 수는 점막 고유층과 상피세포 내 모두에서 유의한 차이가 없었다. 결 론: 소아 H. pylori 감염에서 cagA, cagE, vacA 및 babA2 유전형과 위점막 림프구는 유의한 상관성이 없었다. 향후, H. pylori가 숙주의 면역을 회피하고 지속적으로 살아남아 다양한 위장질환을 일으키는 병인을 규명하기 위해 H. pylori 감염 소아를 대상으로 위점막 면역반응에 대한 대단위 연구가 필요하다.

• 한국응용과학기술학회지
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• 제27권2호
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• pp.216-221
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• 2010

Polyvinyl acetate (PVAc) prepared by emulsion polymerization has broad applications for additive such as paint binder, adhesive for wood and paper due to its low glass transition temperature which help to plasticize substrate resins. Since emulsion polymerization has a disadvantage that surfactant and ionic initiator degrade properties of the product polymer, poly (vinyl acetate-eo-ethyl acrylate) (VAc-EA) was synthesized using potassium persulfate as catalyst and polyvinylalcohol (PVA) as protective colloid to prevent the degradation. The copolymer latex product was internally plasticized and has enhanced adhesion, water resistance during VAc-EA emulsion polymerization. No coagulation and complete conversion occur with the reactant mixture of 10 mmol/L potassium persulfate, 10 mmol/L poly ( vinyl alcohol) (PVA 17). As the concentrations of PVA increase, the viscosity becomes increase.

• 대한임상검사과학회지
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• 제50권3호
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• pp.275-283
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• 2018

Helicobacter pylori는 만성 위염, 위궤양 또는 위 선암을 비롯한 다양한 위장병의 원인균으로 알려져 있으며, 이 세균이 분비하는 cytotoxin-associated protein A (CagA), vacuolating cytotoxic protein A (VacA)와 같은 병원성 인자가 그 원인으로 알려져 있다. 본 연구에서는 zerumbone이 CagA, VacA를 비롯한 다양한 H. pylori의 병원성 인자들의 단백 발현양 변화에 정성적, 정량적으로 어떠한 영향을 미치는지 분석하였다. H. pylori 60190 (VacA 양성 / CagA 양성; Eastern type) 표준균주를 대상으로 하여 약 200개의 유의미한 단백을 선별한 후, 그 중에서 임상적으로 의의가 큰 13개 단백 분자에 대한 프로테옴 분석을 수행하였다. 이차원 전기 영동법(2 dimensional electrophoresis, 2-DE) 수행 후, 단백질 스팟의 정량적 측정에는 ImageMasterTM 2-DE Platinum 소프트웨어를 사용하였고, 단백 동정에는 matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-TOF-MS)와 liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS)를 사용하였다. 동정이 완료된 전체 단백 중에서 유의미한 변화를 보인 단백을 집중적으로 분석한 뒤에 필요에 따라 reverse transcription -polymerase chanin reaction을 수행하여 결과를 추가 검증하였다. 본 연구에서는 zerumbone이 보유한 새로운 약리학적 활성 기전을 스크리닝함으로써 향후 zerumbone이 H. pylori 감염증 치료제로서 어떠한 의미를 지니는지 규명하고자 하였다.

• Asian Pacific Journal of Cancer Prevention
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• 제15권20호
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• pp.9027-9031
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• 2014

Background: Helicobacter pylori (H. pylori) infection is an established cause of peptic ulcers and gastric cancer. The aim of this study was to identify H. pylori genotypes and to examine their associations with geographical regions and gastritis, peptic ulcers and gastric cancer in Laos. Materials and Methods: A total of 329 Lao dyspeptic patients who underwent gastroscopy at Mahosot Hospital, Vientiane, Laos during December 2010 - March 2012 were enrolled. Two biopsy specimens (one each from the antrum and corpus) were obtained for CLO testing and only CLO test-positive gastric tissue were used to extract DNA. PCR and sequencing were identified for variants of the cagA and vacA genotypes. Results: Some 119 Laos patients (36.2%) were found to be infected with H. pylori including 83 with gastritis, 13 with gastric ulcers (GU), 20 with duodenal ulcers (DU) and 3 with gastric cancer. cagA was detected in 99.2%. East-Asian-type cagA (62%) and vacA s1c (64.7%) were predominant genotypes in Laos. vacA s1c-m1b was significantly higher in GU than gastritis (53.8% vs. 24.1%; P-value=0.04) whereas vacA s1a-m2 was significantly higher in DU than gastritis (40.0% vs. 16.9%; P-value=0.03). East-Asian-type cagA and vacA s1c were significantly higher in highland than lowland Lao (100% vs. 55.8%; P-value=0.001 and 88.2% vs. 61.5%, P-value=0.03 respectively). Conclusions: H. pylori is a common infection in Laos, as in other countries in Southeast Asia. The cagA gene was demonstrated in nearly all Laos patients, cagA and vacA genotypes being possible important factors in explaining H. pylori infection and disease outcomes in Laos.

• 대한의생명과학회지
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• 제21권4호
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• pp.233-240
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• 2015

Some virulence proteins of Helicobacter pylori, such as vacuolating cytotoxic protein A (VacA) and cytotoxin-associated gene protein A (CagA) have been reported to be causative agents of various gastric diseases including chronic gastritis, gastric ulcer or gastric adenocarcinoma. The expression level of these virulence proteins can be regulated when H. pylori is exposed to the antibacterial agent, cyanidin 3-O-glucoside (C3G) as previously reported. In this study, we analyzed the quantitative change of various virulence proteins including CagA and VacA by C3G treatment. We used 2-dimensional electrophoresis (2-DE) to analyze the quantitative change of representative ten proteome components of H. pylori 60190 ($VacA^+/CagA^+$; standard strain of Eastern type). After 2-DE analysis, spot intensities were analyzed using ImageMaster$^{TM}$ 2-DE Platinum software then each spot was identified using matrix assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF-MS) or peptide sequencing using Finnigan LCQ ion trap mass spectrometer (LC-MS/MS). Next, we selected major virulence proteins of H. pylori among quantitatively meaningful ten spots and confirmed the 2-DE results by Western blot analysis. These results suggest that cyanidin 3-O-glucoside can modulate a variety of H. pylori pathogenic determinants.

• 한국콘텐츠학회논문지
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• 제10권6호
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• pp.360-363
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• 2010

본 연구는 방사선치료 시 환자 체위고정과 정확한 부위를 표시하기 위해 사용되는 Themo-plastic, Vac-lock, Cotton, Plaster의 보조기구가 전자선 에너지의 변화에 따라 환자의 피부선량이 얼마나 달라지는지 알아보고자 한다. 실험방법으로는 선형가속기를 이용하여 전자선 6Mev, 9Mev, 12Mev, 15Mev의 에너지로 평행 평판형 전리함을 설치하고 선원에서 표면까지의 거리는 100cm, 조사야의 크기 $10cm{\times}10cm$, 입사각도 $0^{\circ}$로 위치시킨 상태에서 보조기구 종류에 따른 표면선량을 측정하였다. 매회 선량은 100MU를 조사하였고 측정값은 오차를 줄이기 위하여 3회 반복 측정하였다. 결과로서는 Vac-lock이 표면선량이 가장 높게 나타났으며, 그 다음 순으로 Themo-plastic, Plaster, Cotton으로 나타났다.

• 한국미생물·생명공학회지
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• 제51권4호
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• pp.507-516
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• 2023

Eradication of Helicobacter pylori infection is an essential strategy to decrease the risk of developing gastric cancer. However, the standard triple therapy has negative aspects associated with side effects and the emergence of antibiotic resistance. Therefore, alternative therapies are required to enhance the management of H. pylori infection effectively. In this study we examined the effect of emodin on the amelioration of inflammatory response due to H. pylori infection. Our results indicated that emodin treatment effectively decreased the expression of virulence genes, including sabA, vacA, cagL, cagA, sabA, and suppressed the adhesion ability of H. pylori to AGS cells. Emodin has been shown inhibitory effects on the inflammasome pathway through reductions in VacA translocation, lowering ROS stress, cleaved Caspase-1, NLRP3, and cleaved Gasdermin D levels, thereby lowered pyroptosis in infected cells. In summary, our study demonstrated that emodin has the ability to attenuate inflammation caused by H. pylori by modulating virulence gene expression and decreasing VacA translocation. Further study is required to evaluate the therapeutic efficacy of emodin in treating H. pylori infection and better understand the underlying mechanisms.

• Journal of Microbiology and Biotechnology
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• 제13권5호
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• pp.706-709
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• 2003

Ginsenosides and polysaccharides were isolated from Panax ginseng C.A. Meyer (Family Araliaceae) by treating at low ($60^{\circ}C$, LT), mild ($100^{\circ}C$, MT), and high ($120^{\circ}C$, HT) temperatures, and their inhibitory effects on growth, infection, and VacA vacuolation of Helicobacter pylori (HP) were investigated. The molecular weights of polysaccharides decreased as the processing temperature increased. Ginseng polysaccharides inhibited the HP infection into KATO III cells, but did not inhibit growth of HP and VacA vacuolation of HeLa cells. HT polysaccharides showed the most potent inhibition with $IC_50$ value of 6.8 mg/ml. Ginseng saponins did not inhibit the infection of HP into KATO cells. However, 20(s)-protopanaxadiol showed the most potent inhibition of HP growth and vacuolation of HeLa by VacA toxin with $IC_50$ values of 0.05 and 0.067 mg/ml, respectively.

• Archives of Plastic Surgery
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• 제45권1호
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• pp.45-50
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• 2018

Background Free muscle flaps are a mainstay for reconstruction of distal third leg wounds and for large lower extremity wounds with exposed bone. However a major problem is the significant postoperative flap swelling, which may take months to resolve. We studied the efficacy and safety of immediate application of a vacuum assisted closure (VAC) dressing after a free muscle flap to the lower extremity. Methods Over a 19 months period, all consecutive free muscle flaps for lower extremity reconstruction at a Level I trauma center were evaluated prospectively for postoperative flap thickness, complications and flap survival. Immediate application of a VAC dressing was performed in 9 patients, while the flap was left exposed for monitoring in 8 patients. Results There was no statistically significant difference in flap survival between both cohorts. Mean flap thickness at postoperative day 5 for the VAC group was $6.4{\pm}6.4mm$, while flap thickness for the exposed flap group was $29.6{\pm}13.5mm$. Flap thickness was significantly decreased at postoperative day 5 for the VAC dressing group. Conclusions Immediate application of VAC dressing following free muscle flaps to the lower extremity does not compromise flap survival or outcomes and results in decreased flap thickness and a better aesthetic outcome.

• 전력전자학회논문지
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• 제15권6호
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• pp.466-476
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• 2010

본 논문에서 다이오드정류기와 커패시터 필터로 구성된 입력전원을 가지고 동작되는 60W이하의 출력파워용량을 갖는 노트북용 어댑터를 위한 새로운 LLC 공진컨버터에 대한 내용이다. 보조스위치의 동작에 의해 제안된 LLC 공진컨버터는 모든 입력전원 (110VAC/220VAC) 및 부하조건에서 높은 효율특성을 가지고 전력을 전달 할 수 있다. 제안된 컨버터에 대한 동작특성에 대해 분석, 서술되어 있으며, 60W 시제품제작 및 실험을 통하여 적용 가능함을 보였다.