1. Mechanisms linking metabolism of Helicobacter pylori to 18O and 13C-isotopes of human breath CO2.
- Author
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Som, Suman, De, Anulekha, Banik, Gourab Dutta, Maity, Abhijit, Ghosh, Chiranjit, Pal, Mithun, Daschakraborty, Sunil B., Chaudhuri, Sujit, Jana, Subhra, and Pradhan, Manik
- Subjects
METABOLISM ,HELICOBACTER pylori ,CARBON isotopes ,CARBON dioxide ,PATHOGENIC microorganisms ,EXCRETION - Abstract
The gastric pathogen Helicobacter pylori utilize glucose during metabolism, but the underlying mechanisms linking to oxygen-18 (
18 O) and carbon-13 (13 C)-isotopic fractionations of breath CO2 during glucose metabolism are poorly understood. Using the excretion dynamics of18 O/16 O and13 C/12 C-isotope ratios of breath CO2 , we found that individuals with Helicobacter pylori infections exhibited significantly higher isotopic enrichments of18 O in breath CO2 during the 2h-glucose metabolism regardless of the isotopic nature of the substrate, while no significant enrichments of18 O in breath CO2 were manifested in individuals without the infections. In contrast, the13 C-isotopic enrichments of breath CO2 were significantly higher in individuals with Helicobacter pylori compared to individuals without infections in response to13 C-enriched glucose uptake, whereas a distinguishable change of breath13 C/12 C-isotope ratios was also evident when Helicobacter pylori utilize natural glucose. Moreover, monitoring the18 O and13 C-isotopic exchange in breath CO2 successfully diagnosed the eradications of Helicobacter pylori infections following a standard therapy. Our findings suggest that breath12 C18 O16 O and13 C16 O16 O can be used as potential molecular biomarkers to distinctively track the pathogenesis of Helicobacter pylori and also for eradication purposes and thus may open new perspectives into the pathogen's physiology along with isotope-specific non-invasive diagnosis of the infection. [ABSTRACT FROM AUTHOR]- Published
- 2015
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