High prevalence of cagA-positive strains in Helicobacter pylori-infected, healthy, young Chinese adults
| Autor: | Dianyuan Zhou, S. Pichuantes, John H. Walsh, Haitao Yang, Min Song, A. Polito, Stella Quan, S. V. Wu, Zhimin Xu, Jide Wang |
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| Rok vydání: | 2003 |
| Předmět: |
Hepatology
Spirillaceae Incidence (epidemiology) Gastroenterology Biology Helicobacter pylori bacterial infections and mycoses biology.organism_classification digestive system Virology digestive system diseases law.invention Microbiology law medicine bacteria CagA Helicobacter Gastritis medicine.symptom Gene Polymerase chain reaction |
| Zdroj: | Journal of Gastroenterology and Hepatology. 14:476-480 |
| ISSN: | 1440-1746 0815-9319 |
| DOI: | 10.1046/j.1440-1746.1999.01892.x |
| Popis: | Background: Cytotoxin-associated gene A (cagA) has been implicated as a potential pathogenic marker for Helicobacter pylori-induced severe gastroduodenal diseases. Although the prevalence of cagA-positive strains has been reported in patient populations from developed countries, only limited information from developing countries is available. Methods: Polymerase chain reaction (PCR) in combination with immunoblot analysis was used to determine the prevalence of cagA and its adjacent cagE genes and to evaluate the expression of CagA protein in 55 H. pylori clinical isolates from China. Results: The expected PCR products derived from H. pylori cagA and cagE genes were identified in all Chinese H. pylori clinical isolates. Similarly, the CagA protein was detected in all 40 isolates tested. Conclusions: These results demonstrated that the presence of the cagA gene correlated well with expression of the CagA protein in all surveyed Chinese H. pylori isolates and that infection with cagA-positive H. pylori strains is highly common in China and independent of clinical presentation. |
| Databáze: | OpenAIRE |
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