Abstract
Background
Food-specific immunoglobulin G4 (FS-IgG4) is associated with eosinophilic esophagitis (EoE); however, it is not clear whether production is limited to the esophagus.
Aims
To assess FS-IgG4 levels in the upper gastrointestinal tract and plasma and compare these with endoscopic disease severity, tissue eosinophil counts, and patient-reported symptoms.
Methods
We examined prospectively banked plasma, throat swabs, and upper gastrointestinal biopsies (esophagus, gastric antrum, and duodenum) from control (n = 15), active EoE (n = 24), and inactive EoE (n = 8) subjects undergoing upper endoscopy. Patient-reported symptoms were assessed using the EoE symptom activity index (EEsAI). Endoscopic findings were evaluated using the EoE endoscopic reference score (EREFS). Peak eosinophils per high-power field (eos/hpf) were assessed from esophageal biopsies. Biopsy homogenates and throat swabs were normalized for protein content and assessed for FS-IgG4 to milk, wheat, and egg.
Results
Median FS-IgG4 for milk and wheat was significantly increased in the plasma, throat swabs, esophagus, stomach, and duodenum of active EoE subjects compared to controls. No significant differences for milk- or wheat-IgG4 were observed between active and inactive EoE subjects. Among the gastrointestinal sites sampled, FS-IgG4 levels were highest in the esophagus. Esophageal FS-IgG4 for all foods correlated significantly across all sites sampled (r ≥ 0.59, p < 0.05). Among subjects with EoE, esophageal FS-IgG4 correlated significantly with peak eos/hpf (milk and wheat) and total EREFS (milk). EEsAI scores and esophageal FS-IgG4 levels did not correlate.
Conclusions
Milk and wheat FS-IgG4 levels are elevated in plasma and throughout the upper gastrointestinal tract in EoE subjects and correlate with endoscopic findings and esophageal eosinophilia.
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Abbreviations
- AMS:
-
Avoidance, modification, and slow eating
- BCA:
-
Bicinchoninic acid assay
- CI:
-
Confidence interval
- CTAB:
-
Cetrimonium bromide
- EEsAI:
-
Eosinophilic esophagitis symptom activity index
- EGID:
-
Eosinophilic gastrointestinal disease
- EoD:
-
Eosinophilic duodenitis
- EoE:
-
Eosinophilic esophagitis
- EoG:
-
Eosinophilic gastritis
- eos/hpf:
-
Eosinophils per high-power field
- EREFS:
-
Endoscopic reference score
- FS-IgG4:
-
Food-specific immunoglobulin G4
- GERD:
-
Gastroesophageal reflux disease
- GI:
-
Gastrointestinal
- H&E:
-
Hematoxylin and eosin
- IBS:
-
Irritable bowel syndrome
- PPI:
-
Proton pump inhibitor
- Q1:
-
Quartile 1
- Q3:
-
Quartile 3
- VDQ:
-
Visual dysphagia question
- yrs:
-
Years
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Acknowledgments
We would like to thank the patients at Mayo Clinic Arizona who participated in this study. We appreciate the assistance of Sara Farmer in the Mayo Clinic Survey Research Center for her assistance with the electronic questionnaires and database. We would also like to thank the members of the esophageal disease group (Marcelo Vela, MD, Francisco Ramirez, MD, and David Fleischer, MD), the allied health staff in the endoscopy suite, and the pathology research core and biorepository staff who assisted with specimen collection, storage and requisition. We acknowledge the support of clinical research coordinators Shannan Avelar and Rachel Kendrick. We thank Ekaterina Safroneeva, PhD for allowing us to use the EEsAI PRO and Evan Dellon, MD, MPH for his aid in interpreting the EEsAI scores.
Funding
This work was supported by the Arizona Biomedical Research Consortium (ADHS18-198880), Donald R. Levin Family Foundation, Mayo Clinic Foundation, and Phoenix Children's Hospital Foundation. M.Y.M. is a member of the Immunology Graduate Program and is supported by the Mayo Clinic Graduate School of Biomedical Sciences. B.L.W. also reports funding from NIH (L30 AI147030) and the Consortium of Eosinophilic Gastrointestinal Disease Researchers U54AI117804 (CEGIR), which is part of the Rare Disease Clinical Research Network (RDCRN), an initiative of the Office of Rare Disease Research (ORDR). CEGIR is also supported by patient advocacy groups, including American Partnership for Eosinophilic Disorders (APFED), Campaign Urging Research for Eosinophilic Diseases (CURED), and Eosinophilic Family Coalition (EFC). As a member of the RDCRN, CEGIR is also supported by its Data Management and Coordinating Center (DMCC) (U2CTR002818).
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BLW designed the study. TS recruited the subjects. JLH collected the human specimens. MYM, WEL, AP, JGB, and GCP performed the data collection. MYM, ADD, and BLW analyzed the data and wrote the initial draft of the manuscript. MRB performed the statistical analysis. All authors have reviewed and approved the final version of the manuscript.
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Masuda, M.Y., LeSuer, W.E., Horsley-Silva, J.L. et al. Food-Specific IgG4 Is Elevated Throughout the Upper Gastrointestinal Tract in Eosinophilic Esophagitis. Dig Dis Sci 68, 2406–2413 (2023). https://doi.org/10.1007/s10620-023-07924-2
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DOI: https://doi.org/10.1007/s10620-023-07924-2