Journal
PROTEOMICS CLINICAL APPLICATIONS
Volume 9, Issue 11-12, Pages 1021-1034Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/prca.201400176
Keywords
Gastric cancer; Mass spectrometry; Motility; Outer membrane proteins
Funding
- NIH [CA116087, AI039657]
- Department of Veterans Affairs Merit Review grant [2l01BX000627]
- Vanderbilt Digestive Disease Research Center [P30DK058404]
- Vanderbilt-Ingram Cancer Center
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Purpose: Helicobacter pylori infection and a high dietary salt intake are each risk factors for the development of gastric cancer. We hypothesize that changes in environmental salt concentrations lead to alterations in the H. pylori membrane proteome. Experimental design: Label-free and iTRAQ methods were used to identify H. pylori proteins that change in abundance in response to alterations in environmental salt concentrations. In addition, we biotinylated intact bacteria that were grown under high-or low-salt conditions, and thereby analyzed salt-induced changes in the abundance of surface-exposed proteins. Results: Proteins with increased abundance in response to high salt conditions included CagA, the outermembrane protein HopQ, and fibronectin domain-containing protein HP0746. Proteins with increased abundance in response to low salt conditions included VacA, two VacAlike proteins (ImaA and FaaA), outer-membrane iron transporter FecA3, and several proteins involved in flagellar activity. Consistent with the proteomic data, bacteria grown in high salt conditions exhibited decreased motility compared to bacteria grown in lower salt conditions. Conclusion and clinical relevance: Alterations in the H. pylori membrane proteome in response to high salt conditions may contribute to the increased risk of gastric cancer associated with a high salt diet.
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