Đánh giá giá trị của nội soi NBI trong chẩn đoán nhiễm khuẩn Helicobacter pylori ở bệnh nhân viêm dạ dày mạn tính

2021 ◽  
Vol 16 (8) ◽  
Author(s):  
Thai Doan Ky ◽  
Hoang Kim Ngan ◽  
Pham Minh Ngoc Quang ◽  
Luu Tuan Thanh
Keyword(s):  
Helicobacter Pylori ◽  
Urease Test ◽  
H Pylori ◽  
Type 3

Mục tiêu: Đánh giá giá trị của nội soi dải tần hẹp (NBI) trong chẩn đoán nhiễm Helicobacter pylori (H. pylori). Đối tượng và phương pháp: Mô tả cắt ngang, hình ảnh nội soi NBI được phân loại thành 4 type dựa trên cấu trúc khe tuyến và mạch máu dưới biểu mô. Bệnh nhân đượclàm urease test và mô bệnh học để đối chiếu, qua đó đánh giá giá trị của nội soi NBI. Kết quả: 89 bệnh nhân được đưa vào nghiên cứu từ ngày 01/11/2020 đến ngày 30/05/2021, trong đó 32 bệnh nhân được xếp loại type 1 chiếm 36%, 34 bệnh nhân xếp loại type 2 (38,2%), 21 bệnh nhân xếp loại type 3 (23,6%) và 2 bệnh nhân được xếp loại type 4 (2,2%), 36 bệnh chẩn đoán dương tính chiếm 53,7%, 31 bệnh nhân âm tính chiếm 46,3%. Độ nhạy của type 2 + type 3 + type 4 trong chẩn đoán H. pylori là 97,22%, độ đặc hiệu là 77,42%, giá trị dự báo dương tính là 83,33%, giá trị dự báo âm tính là 96%. Kết luận: Nội soi NBI có giá trị cao trong chẩn đoán nhiễm H. pylori.

scholarly journals Novel Functions for Glycosyltransferases Jhp0562 and GalT in Lewis Antigen Synthesis and Variation in Helicobacter pylori

2012 ◽  
Vol 80 (4) ◽  
pp. 1593-1605 ◽  
Author(s):  
Mary Ann Pohl ◽  
Sabine Kienesberger ◽  
Martin J. Blaser
Keyword(s):  
Helicobacter Pylori ◽  
Wild Type ◽  
Sequence Analyses ◽  
Upstream Gene ◽  
Content Type ◽  
Lewis Antigen ◽  
Mutant Strains ◽  
H Pylori

ABSTRACTLewis (Le) antigens are fucosylated oligosaccharides present in theHelicobacter pylorilipopolysaccharide. Expression of these antigens is believed to be important forH. pyloricolonization, since Le antigens also are expressed on the gastric epithelia in humans. A galactosyltransferase encoded by β-(1,3)galTis essential for production of type 1 (Leaand Leb) antigens. The upstream genejhp0562, which is present in many but not allH. pyloristrains, is homologous to β-(1,3)galTbut is of unknown function. BecauseH. pyloridemonstrates extensive intragenomic recombination, we hypothesized that these two genes could undergo DNA rearrangement. A PCR screen and subsequent sequence analyses revealed that the two genes can recombine at both the 5′ and 3′ ends. Chimeric β-(1,3)galT-like alleles can restore function in a β-(1,3)galTnull mutant, but neither native nor recombinantjhp0562can. Mutagenesis ofjhp0562revealed that it is essential for synthesis of both type 1 and type 2 Le antigens. Transcriptional analyses of both loci showed β-(1,3)galTexpression in all wild-type (WT) and mutant strains tested, whereasjhp0562was not expressed injhp0562null mutants, as expected. Sincejhp0562unexpectedly displayed functions in both type 1 and type 2 Le synthesis, we asked whethergalT, part of the type 2 synthesis pathway, had analogous functions in type 1 synthesis. Mutagenesis and complementation analysis confirmed thatgalTis essential for Lebproduction. In total, these results demonstrate thatgalTandjhp0562have functions that cross the expected Le synthesis pathways and thatjhp0562provides a substrate for intragenomic recombination to generate diverse Le synthesis enzymes.

scholarly journals Helicobacter pylori–binding nonacid glycosphingolipids in the human stomach

2018 ◽  
Vol 293 (44) ◽  
pp. 17248-17266 ◽  
Author(s):  
Chunsheng Jin ◽  
Angela Barone ◽  
Thomas Borén ◽  
Susann Teneberg
Keyword(s):  
Helicobacter Pylori ◽  
Gastric Mucosa ◽  
Structural Complexity ◽  
Human Stomach ◽  
Carbohydrate Binding ◽  
Human Gastric Mucosa ◽  
H Pylori ◽  
Contrast Information

Helicobacter pylori has a number of well-characterized carbohydrate-binding adhesins (BabA, SabA, and LabA) that promote adhesion to the gastric mucosa. In contrast, information on the glycoconjugates present in the human stomach remains unavailable. Here, we used MS and binding of carbohydrate-recognizing ligands to characterize the glycosphingolipids of three human stomachs from individuals with different blood group phenotypes (O(Rh−)P, A(Rh+)P, and A(Rh+)p), focusing on compounds recognized by H. pylori. We observed a high degree of structural complexity, and the composition of glycosphingolipids differed among individuals with different blood groups. The type 2 chain was the dominating core chain of the complex glycosphingolipids in the human stomach, in contrast to the complex glycosphingolipids in the human small intestine, which have mainly a type 1 core. H. pylori did not bind to the O(Rh−)P stomach glycosphingolipids, whose major complex glycosphingolipids were neolactotetraosylceramide, the Lex, Lea, and H type 2 pentaosylceramides, and the Ley hexaosylceramide. Several H. pylori-binding compounds were present among the A(Rh+)P and A(Rh+)p stomach glycosphingolipids. Ligands for BabA-mediated binding of H. pylori were the Leb hexaosylceramide, the H type 1 pentaosylceramide, and the A type 1/ALeb heptaosylceramide. Additional H. pylori-binding glycosphingolipids recognized by BabA-deficient strains were lactosylceramide, lactotetraosylceramide, the x2 pentaosylceramide, and neolactohexaosylceramide. Our characterization of human gastric receptors required for H. pylori adhesion provides a basis for the development of specific compounds that inhibit the binding of this bacterium to the human gastric mucosa.

scholarly journals Study of the Association Between Diabetes and Helicobacter Pylori Infection in a Tunisian Population

2020 ◽  
Vol 2 (4) ◽  
Author(s):  
Chaima Jemai ◽  
Rim Rachdi ◽  
Sonia Bellamine ◽  
Lamia Bouallegue ◽  
Faika Ben Mami
Keyword(s):  
Helicobacter Pylori ◽  
Medical Records ◽  
Tunisian Population ◽  
Control Group ◽  
Patients With Diabetes ◽  
And Gender ◽  
H Pylori ◽  
Control Study

Introduction: The association between diabetes and Helicobacter Pylori (H. Pylori) infection remains controversial in the literature. The aim of our study was to search an association between diabetes and H. Pylori infection. Methods: This is a case-control study carried out in 2017 over 3 months (September-October-November), collecting 120 patients with dyspepsia, matched for age and gender into two groups: a group of 77 patients with diabetes, and a group of control cases made of 43 non-diabetics. Diabetes was defined according to the American Diabetes Association (ADA) of 2017. Clinical, biological, endoscopic and anatomopathological data were collected from medical records. Results: The average age of the patients was 50±2,1 year. The sex ratio was 0.51. 34.2% (n=41) patients were male. Diabetes was type 2 in the majority of cases (88.31%) and type 1 in 11.68% only. H. Pylori infection was more prevalent in diabetics (19.48%, 11.63%, p=0.27). H. Pylori infection was more prevalent in type 1 diabetics (44.44%, 16.18%, p= 0.04). The frequency of upper endoscopic lesions in diabetics and controls was 70.13% and 74.42%, respectively. Chronic gastritis, gastric atrophy, and intestinal metaplasia were found in 61%, 3.9% and 2.6% of the cases in the group of diabetics and 62.79%, 6.98% and 4.65% respectively in the control group (p= not significant (NS)). Conclusion: Our study shows the absence of a significant association between diabetes and H. Pylori infection, as well as the absence of endoscopic and histological specificities of this infection in patients with diabetes.

scholarly journals Helicobacter pylori outer membrane protein and virulence marker differences in expatriate patients

2016 ◽  
Vol 144 (10) ◽  
pp. 2200-2208 ◽  
Author(s):  
J. YAKOOB ◽  
Z. ABBAS ◽  
W. JAFRI ◽  
R. KHAN ◽  
S A. SALIM ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Membrane Protein ◽  
Outer Membrane ◽  
Outer Membrane Protein ◽  
Virulence Marker ◽  
Virulence Markers ◽  
Local Residents ◽  
H Pylori

SUMMARYWe studied the prevalence of Helicobacter pylori virulence markers, e.g. cytotoxin associated gene (cagA), cagA promoter, vacuolating associated cytotoxin A (vacA) alleles induced by contact with epithelium (iceA type), and outer membrane protein Q (hopQ) in expatriates and compared them with those in local residents. Gastric biopsies were obtained at endoscopy for culture, histology and PCR for virulence marker and hopQ. Of 309 patients, 236 (76%) were males with a mean age of 45 years. A total of 102 patients were expatriates. hopQ type 1 was present in 98 (47%) local residents compared to 88 (86%) expatriates (P < 0·001), while hopQ type 2 was present in 176 (85%) local residents, compared to 60 (59%) expatriates (P < 0·001). H. pylori virulence marker cagA was positive in 97 (47%) local residents compared to 86 (84%) expatriates (P < 0·001) while cagA-P was positive in 72 (35%) local residents compared to 87 (85%) expatriates (P < 0·001). iceA type 1 was positive in 157 (76%) local residents compared to 45 (44%) expatriates (P < 0·001), while iceA type 2 was positive in 81 (39%) local residents compared to 86 (84%) expatriates (P < 0·001). Distribution of H. pylori cagA, cagA promoter, iceA and hopQ type in local residents and expatriates was different. H. pylori virulence markers were associated with severe pathology in expatriates.

scholarly journals Analysis of Helicobacter pylori isolates from Chile: occurrence of selective type 1 Lewis b antigen expression in lipopolysaccharide

2008 ◽  
Vol 57 (5) ◽  
pp. 585-591 ◽  
Author(s):  
Eleonora Altman ◽  
Heriberto Fernández ◽  
Vandana Chandan ◽  
Blair A. Harrison ◽  
Myra Wilson Schuster ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Blood Group ◽  
Western Blotting ◽  
Gel Electrophoresis ◽  
Indirect Elisa ◽  
Antigen Expression ◽  
Whole Cell ◽  
H Pylori

Previous studies have shown that the LPS of Helicobacter pylori isolated from North American and European hosts predominantly expresses type 2 Lewis x (Lex) and Ley epitopes, whilst the LPS from Asian strains has the capacity to express type 1 Lea and Leb structures. The aim of this study was to evaluate the expression of Le antigens and the cytotoxin-associated antigen (CagA) by H. pylori isolates from Chile. A total of 38 isolates were screened. The expression of Le antigens and CagA was determined by whole-cell indirect ELISA, using commercially available monoclonal anti-Le and polyclonal anti-CagA antibodies. LPS profiles of H. pylori isolates were assessed by gel electrophoresis and Western blotting. Expression of Lex and/or Ley epitopes was confirmed in 32/38 isolates (84 %), whilst 9/38 isolates (24 %) expressed type 1 Leb blood group determinants, in addition to type 2 Lex and Ley structures. Six strains (16 %) were non-typeable. The majority of H. pylori strains examined were CagA-positive (83.3 %).

scholarly journals Rhesus monkey gastric mucins: oligomeric structure, glycoforms and Helicobacter pylori binding1

2004 ◽  
Vol 379 (3) ◽  
pp. 765-775 ◽  
Author(s):  
Sara LINDÉN ◽  
Thomas BORÉN ◽  
André DUBOIS ◽  
Ingemar CARLSTEDT
Keyword(s):  
Helicobacter Pylori ◽  
Rhesus Monkey ◽  
Blood Group ◽  
T Antigen ◽  
Blood Group Antigens ◽  
Human Beings ◽  
Sialyl Lex ◽  
H Pylori

Mucins isolated from the stomach of Rhesus monkey are oligomeric glycoproteins with a similar mass, density, glycoform profile and tissue localization as human MUC5AC and MUC6. Antibodies raised against the human mucins recognize those from monkey, which thus appear to be orthologous to those from human beings. Rhesus monkey muc5ac and muc6 are produced by the gastric-surface epithelium and glands respectively, and occur as three distinct glycoforms. The mucins are substituted with the histo blood-group antigens B, Lea (Lewis a), Leb, Lex, Ley, H-type-2, the Tn-antigen, the T-antigen, the sialyl-Lex and sialyl-Lea structures, and the expression of these determinants varies between individuals. At neutral pH, Helicobacter pylori strains expressing BabA (blood-group antigen-binding adhesin) bind Rhesus monkey gastric mucins via the Leb or H-type-1 structures, apparently on muc5ac, as well as on a smaller putative mucin, and binding is inhibited by Leb or H-type-1 conjugates. A SabA (sialic acid-binding adhesin)-positive H. pylori mutant binds to sialyl-Lex-positive mucins to a smaller extent compared with the BabA-positive strains. At acidic pH, the microbe binds to mucins substituted by sialylated structures such as sialyl-Lex and sialylated type-2 core, and this binding is inhibited by DNA and dextran sulphate. Thus mucin–H. pylori binding occurs via at least three different mechanisms: (1) BabA-dependent binding to Leb and related structures, (2) SabA-dependent binding to sialyl-Lex and (3) binding through a charge-mediated mechanism to sialylated structures at low pH values.

scholarly journals Implication of CytotoxicHelicobacter pyloriInfection in Autoimmune Diabetes

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Alessandro P. Delitala ◽  
Giovanni M. Pes ◽  
Hoda M. Malaty ◽  
Gavino Pisanu ◽  
Giuseppe Delitala ◽  
...  
Keyword(s):  
Type 2 Diabetes ◽  
Type 1 Diabetes ◽  
Helicobacter Pylori ◽  
Late Onset ◽  
Autoimmune Diabetes ◽  
Igg Antibodies ◽  
Latent Autoimmune Diabetes ◽  
H Pylori

Background.Type 1 diabetes (T1D) and type 2 diabetes (T2D) have been linked toHelicobacter pyloriinfection, although results are conflicting. No previous study addressed a possible link betweenH. pyloriinfection and latent autoimmune diabetes in adults (LADA). In this study, a correlation amongH. pyloriinfection and the risk of autoimmune diabetes in comparison with T2D was investigated.Methods.Sera from 234 LADA patients, 105 patients with late-onset T1D, and 156 patients with T2D were analyzed for anti-H. pyloriand the cytotoxin-associated antigen (CagA) IgG antibodies. Results. H. pyloriseroprevalence was comparable in LADA (52%), late-onset T1D (45%), and T2D (49%) with no gender differences. The seroprevalence of CagA IgG was significantly higher in autoimmune diabetes (late-onset T1D: 45%, LADA: 40%) compared to T2D (25%;p<0.028).Conclusions.AlthoughH. pyloriseroprevalence was similar in LADA, T1D, and T2D, anti-CagA positivity was significantly increased among patients with autoimmune diabetes, suggesting that more virulentH. pyloristrains might be a trigger for immune mechanisms involved in their pathogenesis.

scholarly journals Correlation between Gastric Mucosal Morphologic Patterns and Histopathological Severity ofHelicobacter pyloriAssociated Gastritis Using Conventional Narrow Band Imaging Gastroscopy

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Taweesak Tongtawee ◽  
Soraya Kaewpitoon ◽  
Natthawut Kaewpitoon ◽  
Chavaboon Dechsukhum ◽  
Ryan A. Loyd ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Narrow Band ◽  
Narrow Band Imaging ◽  
Predictive Values ◽  
Regular Arrangement ◽  
Irregular Border ◽  
Sensitivity Specificity ◽  
Type 3

Background and Aim. Identifying specific gastric mucosal morphologic patterns useful for detectingHelicobacter pyloriassociated gastritis and correlation with histopathological severity.Methods. The endoscopists classified the C-NBI gastroscopic findings into 5 gastric mucosal morphologic patterns as follows: type 1: regular arrangement of collecting venules, type 2: cone-shaped gastric pits, type 3: rod-shaped gastric pits with prominent sulci, type 4: ground glass-like morphology, and type 5: dark brown patches with bluish margin and irregular border. Biopsies of all of the cases were then evaluated by 5 pathologists for definitiveHelicobacter pyloridiagnosis.Result. Type 1 and type 2 patterns were statistically significant in predictingHelicobacter pylorinegative status (58/60,P<0.01). Type 3, type 4, and type 5 patterns were statistically significant in predictingHelicobacter pyloripositive status (132/140,P<0.01). Furthermore, the sensitivity, specificity, and positive and negative predictive values of type 3, 4, or 5 morphologies for predictingHelicobacter pyloripositive were 94.28%, 96.66%, 98.50%, and 87.87%, respectively, correlated well with inflammation grading according to the Sydney classification (P<0.01).Conclusion. Our study suggests that gastric mucosal morphologic patterns in theHelicobacter pyloriinfected gastric mucosa can be reliably identified using C-NBI gastroscopy with good correlation with inflammation grading.

FUNCTIONAL STATUS AND ADAPTIVE POTENTIAL IN FOREIGN STUDENTS WITH DIFFERENT TYPES OF VEGETATIVE REGULATION DURING TUITION

2020 ◽  
pp. 118-126
Author(s):  
A.M. Satarkulova
Keyword(s):  
Heart Rate ◽  
Foreign Students ◽  
Autonomic Regulation ◽  
The Body ◽  
Functional Changes ◽  
Different Types ◽  
Type 3 ◽  
Adaptive Abilities

The assessment and dynamic control over students’ status is a very important task. It allows timely detection of prenosological status prior to pathology and health maintenance in students. The objective of the paper is to assess the adaptive abilities of the body, to analyze changes in heart rate variability indicators in students with various types of autonomic regulation, to identify prenosological status and precursory pathological symptoms. Materials and Methods. The study enrolled 302 students from India, aged 21.54±1.43. Programming complex «Psychophysiologist» was used to register the main HRV parameters within 5 minutes. Health status was evaluated according to the index of functional changes and the scale of functional states. Results. N.I. Shlyk (2009) distinguished two groups of students with different types of autonomic regulation: type 1 (53 %) with moderate and type 2 (5 %) with marked characteristics of central regulation profile, type 3 (35 %) with moderate and type 4 (7 %) with marked characteristics of autonomous regulation profile. Main parameters of HRV and adaptation potential were defined for each student.All the parameters characterized functional and health status. Conclusions. It was shown that 82 % of trial subjects (type 1), 53 % (type 2), 94 % (type 3) and 95 % (type 4) demonstrated satisfactory adaptation and their physiological processes were at an optimal level. 18 % of students (type 1) demonstrated reduced adaptive abilities of the body. Moreover, they were under moderate stress. 47 % of subjects (type 2) were also under a significant stress, which was proven by excessively high SI, low SDNN and TP, and an increased index of functional changes. 5 % of students (type 4) revealed dysfunctional characteristics in the heart rhythm, peculiar to pathology. Keywords: foreign students, heart rate variability, types of autonomic regulation, adaptation potential, functional status. Оценка состояния студентов и динамический контроль за ним является важной задачей, поскольку позволяет своевременно выявлять у студентов донозологические состояния, предшествующие патологии, и способствовать сохранению здоровья. Цель. Оценка адаптивных возможностей организма, анализ изменений показателей вариабельности сердечного ритма у студентов с различными типами вегетативной регуляции, выявление донозологических состояний и ранних признаков патологии. Материалы и методы. В исследовании участвовало 302 студента в возрасте 21,54+1,43 года из Индии. Регистрировались основные параметры ВСР в течение 5 мин с использованием программно-аппаратного комплекса «Психофизиолог». Состояние и уровень здоровья оценивались по индексу функциональных изменений и шкале функциональных состояний. Результаты. По способу, предложенному Н.И. Шлык, выделены группы студентов с различными типами вегетативной регуляции: I (53 %) и II типы (5 %) – с умеренным и выраженным преобладанием центрального контура регуляции соответственно, III (35 %) и IV типы (7 %) – с умеренным и выраженным преобладанием автономного контура регуляции соответственно. У каждого из студентов определены основные параметры ВСР и адаптационного потенциала, характеризующие функциональное состояние и уровень здоровья. Выводы. Показано, что для 82 % обследуемых с I типом, 53 % со II типом, 94 % c III типом и 95 % с IV типом регуляции характерно состояние удовлетворительной адаптации, физиологические процессы сохраняются на оптимальном уровне. В группе студентов I типа у 18 % студентов адаптивные возможности организма снижены, выявлено состояние умеренного напряжения. У 47 % обследуемых II типа также зафиксировано состояние резко выраженного напряжения, индикатором которого является чрезмерно высокое значение SI, низкие величины SDNN и ТP, повышенное значение индекса функциональных изменений. В группе студентов с IV типом у 5 % учащихсяв регуляции ритма сердца выявлены дисфункциональные признаки, характерные для патологии. Ключевые слова: иностранные студенты, вариабельность сердечного ритма, типы вегетативной регуляции, адаптационный потенциал, функциональное состояние.

POLIOMYELITIS IN CANADIAN ESKIMOS: LABORATORY STUDIES. V. TYPE 1 AND TYPE 3 POLIOMYELITIS ANTIBODY LEVELS IN BAFFIN ISLAND ESKIMOS

1954 ◽  
Vol 32 (1) ◽  
pp. 119-125
Author(s):  
W. Wood ◽  
Eina M. Clark ◽  
F. T. Shimada ◽  
A. J. Rhodes
Keyword(s):  
Medical Records ◽  
Baffin Island ◽  
Tissue Cultures ◽  
Laboratory Studies ◽  
Poliomyelitis Virus ◽  
Antibody Titers ◽  
Antibody Levels ◽  
Type 3

Studies on the basic immunology of poliomyelitis in Canadian Eskimos have been continued. Some 87 sera collected from Eskimos at Pangnirtung, Baffin Island, have been examined for the presence of Type 1 and Type 3 poliomyelitis antibody by quantitative tests in tissue cultures. The same sera were previously examined for Type 2 antibody by quantitative tests in mice. The results of the three determinations are now presented together for comparison. These sera came from Eskimos aged 2 to 72 years of age. None of the Eskimos showed any evidence of paralysis. Examination of the medical records did not suggest that any paralytic disease had been present in this part of Baffin Island. Very few of the sera showed the presence of poliomyelitis antibody; thus, Type 1 antibody was demonstrated in the sera of 8%, Type 2 antibody in the sera of 9%, and Type 3 antibody in the sera of 14%. No significant number of Eskimos below the age of 45 years had acquired poliomyelitis antibody. The antibody titers mostly ranged between 10−1.0 and 10−2.0, and were significantly lower than the titers customarily found in recently paralyzed cases. These findings suggest that poliomyelitis infection occurred in Pangnirtung Eskimos many years before the date on which the samples were taken (1951). These results point to the worldwide prevalence of the three types of poliomyelitis virus.

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