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Title: Role of 13C-urea breath test in experimental model of Helicobacter pylori infection in mice
Author: Santos, António Mário
Lopes, Teresa
Oleastro, Mónica
Chaves, Paula
Cordeiro, Rita
Ferreira, Maria
Pereira, Teresa
Machado, Jorge
Guerreiro, António Sousa
Keywords: 13C-UBT
H. pylori
Infecções Gastrointestinais
Issue Date: Aug-2011
Publisher: Blackwell Publishing Lta
Citation: Helicobacter. 2011 Aug;16(4):320-6. Epub 2011 Jul 18
Abstract: BACKGROUND: Animal models have been widely used to study Helicobacter pylori infection. Evaluation of H. pylori infection status following experimental inoculation of mice usually requires euthanasia. The (13) C-urea breath test ((13) C-UBT) is both sensitive and specific for detection of H. pylori in humans. Thus, it would be very useful to have such a test with the same accuracy for the follow-up of this infection in animal models of gastric infection. Accordingly, the purpose of this study was to develop and evaluate a (13) C-UBT method for following the course of H. pylori infection in a mouse model. MATERIAL AND METHODS: A total of 50 female C57BL/6 mice were gavaged three times with either 10(8) colony-forming units of H. pylori (n=29) or saline solution only (n=21). After 2 months of infection, mice were fasted for 14 hours and (13) C-UBT was performed using 300 μg of (13) C-urea. The mice were killed, and the stomach was removed and processed for immunohistochemistry and PCR. RESULTS: The optimal time for breath sample collection in mice was found to be 15 minutes. The (13) C-UBT cutoff was set at 3.0‰ δPDB. Using PCR as the gold standard, the sensitivity of (13) C-UBT and immunohistochemistry was 96.6 and 72.4%, respectively, while the specificity was 85.7 and 95.2%, respectively. CONCLUSIONS: (13) C-UBT was shown to be a reliable method for the detection of H. pylori infection in C57BL/6 mice and was even more accurate than immunohistochemistry. The use of (13) C-UBT in the mouse model of H. pylori infection can be very useful to detect the bacterium without the need to kill the animals in long-term time course studies.
Peer review: yes
ISSN: 1083-4389
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Appears in Collections:DDI - Artigos em revistas internacionais

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