scholarly journals Influence of Helicobacter pylori Infection on the Small Intestinal Mucosa

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Mitsunori Maeda ◽  
Masakazu Nakano ◽  
Hideyuki Hiraishi
Keyword(s):  
Helicobacter Pylori ◽  
Negative Relationship ◽  
Mucosal Injury ◽  
Enzyme Linked Immunosorbent Assay ◽  
Small Intestinal Mucosa ◽  
Significant Negative Relationship ◽  
Positive Rate ◽  
Intestinal Mucosal Injury ◽  
Small Intestinal ◽  
H Pylori

Background/Aims. To investigate the role of Helicobacter pylori infection in the development of enteritis (small intestinal mucosal injury). Methodology. Between April 2007 and January 2013, 99 patients undergoing capsule endoscopy (CE) were tested for anti-H. pylori immunoglobulin G antibody (Hp-IgG) using an enzyme-linked immunosorbent assay (ELISA). None of the patients had been treated for H. pylori infection or diagnosed as having Crohn’s disease or any other clinically apparent small intestinal disorders prior to the CE. Results. The overall Hp-IgG-positive rate was 26.3%. The incidence of enteritis, as diagnosed by CE, tended to be lower in the Hp-IgG-positive patients (23.1%) than in the Hp-IgG-negative patients (38.4%) (). When patients receiving aspirin or nonsteroidal anti-inflammatory drugs (NSAIDs), well-known causes of enteritis, were excluded, the incidence of enteritis in the Hp-IgG-positive patients (11.7%) was significantly lower than that in the Hp-IgG-negative patients (43.7%) (). A binomial logistic regression analysis revealed a significant negative relationship between Hp-IgG positivity and the presence of enteritis in patients receiving neither aspirin nor NSAIDs (). Conclusions. Our data indicated that H. pylori positivity was inversely associated with the prevalence of enteritis.

Extent and Duration of Small Intestinal Mucosal Injury in Intractable Diarrhea of Infancy

PEDIATRICS ◽  
1980 ◽  
Vol 66 (5) ◽  
pp. 730-735
Author(s):  
Thomas M. Rossi ◽  
Emanuel Lebenthal ◽  
Kenneth S. Nord ◽  
Rafiqua R. Fazili
Keyword(s):  
Elemental Diet ◽  
Mucosal Injury ◽  
Height Velocity ◽  
Common Finding ◽  
Small Intestinal Mucosa ◽  
Intractable Diarrhea ◽  
Young Infants ◽  
Intestinal Mucosal Injury ◽  
Small Intestinal

Thirty infants with intractable diarrhea of infancy (IDI) underwent small bowel biopsies in order to determine the extent and duration of small intestinal mucosal injury. The onset of the persistent diarrhea occurred prior to 3 months of age and continued for an average of 48 days prior to investigation. In 18 cases, no associated entities were found. Mucosal injury was invariably found in all 30 infants: grade IV injury in 11, grade III in eight, grade II in nine, and grade I atrophy in one. Disaccharidase activities were diminished and corresponded to the degree of atrophy. Lactase activity was diminished to a greater extent than sucrase and maltase. Significant, persistent mucosal injury existed for an average of six months in 16 of the 23 (70%) repeat biopsies. All infants were given an elemental diet (ED). Twelve of the 30 infants required parenteral nutrition (PN). These infants were gradually advanced to an oral elemental diet and maintained on this diet until histologic findings and disaccharidase levels were normal. Eighteen infants were fed and maintained on an elemental diet by mouth from time of admission until normal histologic findings and disaccharidases were found. No mortality occurred during management and follow-up. Twenty-two of the 28 infants in whom follow-up growth data were available excelled in weight and height velocity. The data suggest that prolonged injury to the small intestinal mucosa is a common finding in many cases of intractable diarrhea of infancy. Elemental diets should be started early in the course of protracted diarrhea in young infants, and may need to be continued for several months since histologic and enzymatic changes of the small intestine may persist for extended periods.

Pilot Study Indicates Helicobacter pylori Infection May Induce Small Intestinal Mucosal Injury

Digestion ◽  
2018 ◽  
Vol 99 (1) ◽  
pp. 66-71 ◽  
Author(s):  
Jun Omori ◽  
Shunji Fujimori ◽  
Yuki Kosugi ◽  
Katsuya Yukiko ◽  
Shinsuke Takagi ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Pilot Study ◽  
Mucosal Injury ◽  
Intestinal Mucosal Injury ◽  
Small Intestinal

scholarly journals A Novel Line Immunoassay Based on Recombinant Virulence Factors Enables Highly Specific and Sensitive Serologic Diagnosis of Helicobacter pylori Infection

2013 ◽  
Vol 20 (11) ◽  
pp. 1703-1710 ◽  
Author(s):  
Luca Formichella ◽  
Laura Romberg ◽  
Christian Bolz ◽  
Michael Vieth ◽  
Michael Geppert ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Immune Responses ◽  
Virulence Factors ◽  
Gastrointestinal Disease ◽  
Individual Risk ◽  
Enzyme Linked Immunosorbent Assay ◽  
Type I ◽  
Serologic Test ◽  
Content Type ◽  
H Pylori

ABSTRACTHelicobacter pyloricolonizes half of the world's population, and infection can lead to ulcers, gastric cancer, and mucosa-associated lymphoid tissue (MALT) lymphoma. Serology is the only test applicable for large-scale, population-based screening, but current tests are hampered by a lack of sensitivity and/or specificity. Also, no serologic test allows the differentiation of type I and type II strains, which is important for predicting the clinical outcome.H. pylorivirulence factors have been associated with disease, but direct assessment of virulence factors requires invasive methods to obtain gastric biopsy specimens. Our work aimed at the development of a highly sensitive and specific, noninvasive serologic test to detect immune responses to importantH. pylorivirulence factors. This line immunoassay system (recomLine) is based on recombinant proteins. For this assay, six highly immunogenic virulence factors (CagA, VacA, GroEL, gGT, HcpC, and UreA) were expressed inEscherichia coli, purified, and immobilized to nitrocellulose membranes to detect serological immune responses in patient's sera. For the validation of the line assay, a cohort of 500 patients was screened, of which 290 (58.0%) wereH. pylorinegative and 210 (42.0%) were positive by histology. The assay showed sensitivity and specificity of 97.6% and 96.2%, respectively, compared to histology. In direct comparison to lysate blotting and enzyme-linked immunosorbent assay (ELISA), therecomLine assay had increased discriminatory power. For the assessment of individual risk for gastrointestinal disease, the test must be validated in a larger and defined patient cohort. Taking the data together, therecomLine assay provides a valuable tool for the diagnosis ofH. pyloriinfection.

scholarly journals Incidence of Gastric Metaplasia and Helicobacter pylori Infection in Duodenal Bulb – With Specific Reference to Patients With Duodenal Ulcers

1999 ◽  
Vol 6 (1) ◽  
pp. 17-23 ◽  
Author(s):  
Minoru Kawaguchi ◽  
Toshihiko Saito
Keyword(s):  
Helicobacter Pylori ◽  
Duodenal Bulb ◽  
Mucosal Injury ◽  
Transitional Zone ◽  
Specific Reference ◽  
Rapid Urease Test ◽  
Duodenal Ulcers ◽  
Gastric Metaplasia ◽  
Urease Test ◽  
H Pylori

We determined the incidence of gastric metaplasia in the duodenal bulb of duodenal ulcer patients and the Helicobacter pylori (H. pylori) infection rate at sites with gastric metaplasia. Biopsy of the duodenal bulb showed the presence of gastric metaplasia in 61 of 86 patients (71%) overall and in 18 of 47 patients (38.3%) who had gastrectomy at an early gastric cancer. The histological diagnosis of H. pylori infection showed good agreement (83.3%) with the result of the rapid urease test, indicating that H. pylori occurs in regions with gastric metaplasia. This finding suggests that H. pylori infects gastric metaplasia in the duodenal bulb, causing mucosal injury, which is then transformed into duodenal ulcers. The exact mechanism by which gastric metaplasia is caused is unknown, but it is believed to occur in the transitional zone in the duodenal mucosa.

scholarly journals Preliminary Serological Study of Helicobacter pylori Infection in Some University Students

2020 ◽  
Vol 6 ◽  
pp. 1
Author(s):  
Abdullah A Mahrazi ◽  
Mohammad A Khibrani ◽  
Khatib S Ismail ◽  
Emad Abada ◽  
◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
University Students ◽  
Large Scale ◽  
Confirmatory Test ◽  
Enzyme Linked Immunosorbent Assay ◽  
Blood Collection ◽  
Igg Antibodies ◽  
Igm Antibodies ◽  
H Pylori

Helicobacter pylori has been associated with peptic ulcer and gastric carcinoma. This study aimed to find the seroprevalence of H. pylori infection in some male students of Jazan University, Saudi Arabia. Twenty students were enrolled in the study (n = 20). Informed consent was obtained from the students. About 2 ml blood was collected intravenously in Improvacuter® evacuated blood collection tubes. The blood was allowed to clot at room temperature. The serum was collected and stored at –20°C for further use. The separated serum was used to detect IgG and IgM antibodies by Enzyme Linked Immunosorbent Assay (ELISA) against H. pylori for the in vitro diagnosis. A total of 11 (55.00%) students tested positive for IgG antibodies against H. pylori indicating previous infection. All the samples tested negative for IgM antibodies against H. pylori indicating no active infection. The seroprevalance of IgG antibodies against H. pylori was found to be very high in some male university students and is a cause of concern regarding their health. Obesity (p < 0.05; Value statistically significant), stress and bad eating habits, eating out, drinking carbonated beverages, and eating spicy food were some of the factors found to be associated with IgG seropositive students. The students were counseled and were instructed to undergo a confirmatory test and get medical intervention. Further large-scale studies need to be performed to plan action against this disease causing organism and to improve the health of students.

Transport of bovine serum albumin across rat jejunum: role of the enteric nervous system

1994 ◽  
Vol 266 (2) ◽  
pp. G186-G193 ◽  
Author(s):  
M. H. Kimm ◽  
G. H. Curtis ◽  
J. A. Hardin ◽  
D. G. Gall
Keyword(s):  
Nervous System ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Enteric Nervous System ◽  
Intestinal Mucosa ◽  
Bovine Serum ◽  
Enzyme Linked Immunosorbent Assay ◽  
Small Intestinal Mucosa ◽  
Rat Jejunum ◽  
Small Intestinal

To assess the mechanisms for movement of antigenically intact macromolecules across small intestinal mucosa, transport kinetics of bovine serum albumin (BSA) uptake and the effect of neural and metabolic inhibition were examined in stripped short-circuited rat jejunum. The mucosa was exposed to BSA, and, after a 50-min equilibration, mucosal-to-serosal movement of immunologically intact BSA was determined by enzyme-linked immunosorbent assay and total BSA by radiolabeled 125I-BSA. Intact BSA uptake demonstrated saturable kinetics. Immunologically intact BSA crossed the intestinal mucosa as 4.5% of total 125I-BSA flux. Colchicine and 4 degrees C significantly reduced uptake of immunologically intact BSA. NaF significantly reduced uptake of immunologically intact BSA and 125I-BSA. Treatment with tetrodotoxin significantly reduced intact BSA uptake, but did not significantly alter total BSA uptake. The muscarinic cholinoceptor antagonist atropine also significantly inhibited transport of intact BSA, whereas the nicotinic cholinoceptor antagonist hexamethonium had no effect. These findings indicate that transport of intact macromolecules across small intestinal mucosa is a saturable energy-dependent process that utilizes the microtubular network and is regulated by the enteric nervous system primarily through cholinergic nerves acting on muscarinic receptors.

scholarly journals Repeat-Associated Plasticity in the Helicobacter pylori RD Gene Family

2009 ◽  
Vol 191 (22) ◽  
pp. 6900-6910 ◽  
Author(s):  
Joshua R. Shak ◽  
Jonathan J. Dick ◽  
Richard J. Meinersmann ◽  
Guillermo I. Perez-Perez ◽  
Martin J. Blaser
Keyword(s):  
Helicobacter Pylori ◽  
Gene Family ◽  
Repetitive Dna ◽  
Enzyme Linked Immunosorbent Assay ◽  
Insertion And Deletion ◽  
Amino Acid Repeats ◽  
H Pylori ◽  
Multiple Strains ◽  
Nucleotide Repeats ◽  
Sterilizing Immunity

ABSTRACT The bacterium Helicobacter pylori is remarkable for its ability to persist in the human stomach for decades without provoking sterilizing immunity. Since repetitive DNA can facilitate adaptive genomic flexibility via increased recombination, insertion, and deletion, we searched the genomes of two H. pylori strains for nucleotide repeats. We discovered a family of genes with extensive repetitive DNA that we have termed the H. pylori RD gene family. Each gene of this family is composed of a conserved 3′ region, a variable mid-region encoding 7 and 11 amino acid repeats, and a 5′ region containing one of two possible alleles. Analysis of five complete genome sequences and PCR genotyping of 42 H. pylori strains revealed extensive variation between strains in the number, location, and arrangement of RD genes. Furthermore, examination of multiple strains isolated from a single subject's stomach revealed intrahost variation in repeat number and composition. Despite prior evidence that the protein products of this gene family are expressed at the bacterial cell surface, enzyme-linked immunosorbent assay and immunoblot studies revealed no consistent seroreactivity to a recombinant RD protein by H. pylori-positive hosts. The pattern of repeats uncovered in the RD gene family appears to reflect slipped-strand mispairing or domain duplication, allowing for redundancy and subsequent diversity in genotype and phenotype. This novel family of hypervariable genes with conserved, repetitive, and allelic domains may represent an important locus for understanding H. pylori persistence in its natural host.

Mucus reduction promotes acetyl salicylic acid-induced small intestinal mucosal injury in rats

2018 ◽  
Vol 498 (1) ◽  
pp. 228-233 ◽  
Author(s):  
Yosuke Suyama ◽  
Osamu Handa ◽  
Yuji Naito ◽  
Shun Takayama ◽  
Rieko Mukai ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Mucosal Injury ◽  
Acetyl Salicylic Acid ◽  
Intestinal Mucosal Injury ◽  
Small Intestinal
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