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Gastric Colonization (gastric + colonization)

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Medical Sciences	100%

Selected Abstracts

Helicobacter pylori Infection in the Cat: Evaluation of Gastric Colonization, Inflammation and Function

HELICOBACTER, Issue 1 2001
Kenneth W. Simpson
Background. Further elucidation of the consequences of Helicobacter pylori infection on gastric mucosal inflammation and gastric secretory function would be facilitated by an animal model that is susceptible to infection with H. pylori, is broadly similar in gastric physiology and pathology to people, and is amenable to repeated non-invasive evaluation. The goal of this study was to examine the interrelationship of bacterial colonization, mucosal inflammation and gastric secretory function in cats with naturally acquired H. pylori infection. Materials and Methods. Twenty clinically healthy cats with naturally acquired H. pylori infection (cagA,, picB) and 19 Helicobacter -free cats were evaluated. Gastric colonization was determined by tissue urease activity, light microscopy, culture and PCR. The mucosal inflammatory response was evaluated by light microscopy, and by RT-PCR of the pro-inflammatory cytokines IL-1,, IL-1,, IL-8 and TNF-, in gastric mucosa. Gastric secretory function was assessed by measuring pentagastrin-stimulated acid secretion, fasting plasma gastrin, and antral mucosal gastrin and somatostatin immunoreactivity. Results. H. pylori colonized the pylorus, fundus and cardia in similar density. Bacteria were observed free in the lumen of gastric glands and were also tightly adherent to epithelial cells where they were associated with microvillus effacement. Mononuclear inflammation, lymphoid follicle hyperplasia, atrophy and fibrosis were observed primarily in H. pylori -infected cats, with the pylorus most severely affected. Neutrophilic and eosinophilic infiltrates, epithelial dysplasia, and up-regulation of mucosal IL-1, and IL-8 were observed solely in infected cats. Fasting plasma gastrin concentrations and pentagastrin-stimulated acid output were similar in both infected and uninfected cats. There was no relationship of bacterial colonization density or gastric inflammation to plasma gastrin concentrations or gastric acid output. Conclusions. The pattern of colonization and the mucosal inflammatory response in cats with naturally acquired H. pylori are broadly similar to those in infected people, particularly children, and non-human primates. The upregulation of IL-8 in infected cats was independent of cagA and picB. Our findings argue against a direct acid-suppressing effect of H. pylori on the gastric secretory-axis in chronically infected cats. Abbreviations: RT-PCR, reverse transcriptase polymerase chain reaction, HLO; Helicobacter -like organisms. [source]

Bacterial translocation studied in 927 patients over 13 years

BRITISH JOURNAL OF SURGERY (NOW INCLUDES EUROPEAN JOURNAL OF SURGERY), Issue 1 2006
J. MacFie
Background: Bacterial translocation (BT) describes the passage of bacteria from the gastrointestinal tract to normally sterile tissues such as the mesenteric lymph nodes (MLNs) and other internal organs. The clinical and pathophysiological significance of BT remains controversial. This report describes results obtained over a 13-year period of study. Methods: MLNs were obtained from 927 patients undergoing laparotomy. Nasogastric aspirates were obtained from 458 (49·4 per cent) of 927 patients for culture; pH was measured in 172 (37·6 per cent) of 458. Preoperative clinical variables were evaluated and factors that influenced BT were included in a multivariate logistic regression analysis. Results: BT was identified in 130 (14·0 per cent) of 927 patients. Postoperative sepsis was more common in patients with BT (42·3 versus 19·9 per cent; P < 0·001). Independent preoperative variables associated with BT were emergency surgery (P = 0·001) and total parenteral nutrition (TPN) (P = 0·015). Gastric colonization was confirmed in 248 (54·1 per cent) of 458 patients, and was associated with both BT (P = 0·015) and postoperative sepsis (P = 0·029). A gastric pH of less than 4 was associated with a significant reduction in gastric colonization (53 versus 80 per cent; P < 0·001) and postoperative sepsis (46 versus 70·3 per cent; P = 0·018) but not BT. Conclusion: BT is associated with postoperative sepsis. Emergency surgery and TPN are independently associated with an increased prevalence of BT. Copyright © 2005 British Journal of Surgery Society Ltd. Published by John Wiley & Sons, Ltd. [source]