Proteomics signature of autoimmune atrophic gastritis: towards a link with gastric cancer

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Background: Autoimmune atrophic gastritis (AAG) is a chronic disease that can progress to gastric cancer (GC). To better understand AAG pathology, this proteomics study investigated gastric proteins whose expression levels are altered in this disease and also in GC. Methods: Using two-dimensional difference gel electrophoresis (2D-DIGE), we compared protein maps of gastric corpus biopsies from AAG patients and controls. Differentially abundant spots (|fold change|≥ 1.5, P < 0.01) were selected and identified by LC–MS/MS. The spots were further assessed in gastric antrum biopsies from AAG patients (without and with Helicobacter pylori infection) and from GC patients and unaffected first-degree relatives of GC patients. Results: 2D-DIGE identified 67 differentially abundant spots, with 28 more and 39 less abundant in AAG-corpus than controls. LC–MS/MS identified these as 53 distinct proteins. The most significant (adjusted P < 0.01) biological process associated with the less abundant proteins was “tricarboxylic acid cycle”. Of the 67 spots, 57 were similarly differentially abundant in AAG-antrum biopsies irrespective of H. pylori infection status. The differential abundance was also observed in GC biopsies for 14 of 28 more abundant and 35 of 39 less abundant spots, and in normal gastric biopsies of relatives of GC patients for 6 and 25 spots, respectively. Immunoblotting confirmed the different expression levels of two more abundant proteins (PDIA3, GSTP gene products) and four less abundant proteins (ATP5F1A, PGA3, SDHB, PGC). Conclusion: This study identified a proteomics signature of AAG. Many differential proteins were shared by GC and may be involved in the progression of AAG to GC. © 2021, The Author(s).
Original languageEnglish
Pages (from-to)666-679
Number of pages14
JournalGastric Cancer
Issue number3
Publication statusPublished - 2021


  • Autoimmune disease
  • Biological markers
  • Gastric cancer
  • Gastritis
  • Proteomics
  • glutathione transferase
  • protein disulfide isomerase
  • protein disulfide isomerase A3
  • unclassified drug
  • adult
  • Article
  • ATP5F1A gene
  • atrophic gastritis
  • autoimmune disease
  • carcinogenesis
  • citric acid cycle
  • clinical article
  • comparative study
  • controlled study
  • female
  • first-degree relative
  • GSTP gene
  • Helicobacter infection
  • human
  • human tissue
  • immunoblotting
  • liquid chromatography-mass spectrometry
  • male
  • middle aged
  • oncogene
  • PDIA3 gene
  • PGA3 gene
  • PGC gene
  • priority journal
  • protein analysis
  • protein expression
  • protein folding
  • proteomics
  • SDHB gene
  • stomach biopsy
  • stomach cancer
  • stomach corpus
  • two dimensional difference gel electrophoresis
  • complication
  • pathology
  • precancer
  • stomach tumor
  • Adult
  • Female
  • Gastritis, Atrophic
  • Helicobacter Infections
  • Humans
  • Male
  • Middle Aged
  • Precancerous Conditions
  • Stomach Neoplasms


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