What’s New in Eosinophilic Esophagitis and PPI-Responsive Esophageal Eosinophilia? Stuart Jon Spechler, M.D. Chief, Division of Gastroenterology, VA North Texas Healthcare System; Co-Director, Esophageal Diseases Center, Professor of Medicine, a M. and Cecil O. Patterson Chair in Gastroenterol UT Southwestern Medical Center
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What’s New in Eosinophilic Esophagitis and PPI-Responsive Esophageal Eosinophilia? Stuart Jon Spechler, M.D. Chief, Division of Gastroenterology, VA North.
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What’s New in Eosinophilic Esophagitis and PPI-Responsive
Esophageal Eosinophilia?
What’s New in Eosinophilic Esophagitis and PPI-Responsive
Esophageal Eosinophilia?
Stuart Jon Spechler, M.D.Chief, Division of Gastroenterology, VA North Texas Healthcare System;
Co-Director, Esophageal Diseases Center,Professor of Medicine,
Berta M. and Cecil O. Patterson Chair in Gastroenterology,UT Southwestern Medical Center
Eosinophilic Esophagitis(EoE)
• Tissue damage
Eosinophils infiltrate esophageal squamous epithelium, releasing secretory products that mediate:
• Tissue remodeling
• Symptoms
Incidence of Eosinophilic Esophagitis (EoE)in Olmsted County, Minnesota
Prasad. Clin Gastroenterol Hepatol 2009;7:1055.
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0
2
4
6
8
10
12
1976-1980
1981-1985
1986-1990
1991-1995
1996-2000
2001-2005
EoE in the United States
• Prevalence 50-100 per 100,000- Similar to ulcerative colitisDellon E. Clin Gastroenterol Hepatol 2014;12:589.
• Health-care cost $0.5-1.4 billion per yearJensen E. Am J Gastroenterol 2015;110:626.
• Most common cause of food impaction in patients seen in ERSperry S. Gastrointest Endosc 2011;74:985.
EoE Histology• ≥15 eosinophils per HPF• Eosinophil microabscesses• Basal zone hyperplasia• Dilated intercellular spaces
• Subepithelial fibrosis
The finding of ≥15 eosinophils per HPF has no established biological importance.
Histological findings are not specific.
Epithelium
Subepithelialfibrosis
EoE Affects Children and Adults of All Ages in All Racial and Ethnic Groups
• Reports of EoE from US, Canada, Australia, New Zealand, Europe, Mexico, India, Israel,
Saudi Arabia, Iran, Japan, China
EoE Affects Both SexesMale:Female = 3:1
Eosinophilic esophagitis is a chronic, immune/antigen-mediated esophageal disease characterized clinically by symptoms related to esophageal dysfunction and histologically by
eosinophil-predominant inflammation.
Liacouras CA et al. J Allergy Clin Immunol 2011;128:3-20.
Liacouras CA et al. J Allergy Clin Immunol 2011;128:3-20.
Clinico: Symptoms related to esophageal dysfunctionPathologic: ≥1 esophageal biopsy shows eosinophil-predominant inflammation with ≥15 eos per HPF(recommend 2-4 biopsy specimens from both proximal and distal esophagus)
• Disease should remit with treatments of dietary exclusion, topical corticosteroids or both
Evidence that Eosinophilic Esophagitis is an Allergic Disorder
• 50-60% of patients have history of atopic disease (rhinitis, asthma, atopic dermatitis)
• In animal models, EoE can be induced by allergen sensitization
• Dramatic response to elemental diet
• Most patients exhibit sensitization to food and/or aeroallergens- 15% have food anaphylaxis
• During oral immunotherapy for food allergy, 3% of patients develop EoE
If EoE is caused by food allergy, then why do eosinophils
home to the esophagus?
RNA Microarray Analysis of Esophageal Biopsies
Controls Pts. with EoE
230 Genes230 GenesDownregulatedDownregulated
344 Genes344 GenesUpregulatedUpregulated
Eotaxin-3 Eotaxin-3 (↑ >50-Fold)(↑ >50-Fold)
Blanchard. J Clin Invest 2006;116:536
1 2 3 4 5 6 1 2 3 4 5 6 7 8 9 10 11 12 13
A potent eosinophil A potent eosinophil chemoattractantchemoattractant
Immune System ActivationImmune System ActivationTh1 and Th2 DifferentiationTh1 and Th2 Differentiation
A primary disorder of the esophagus characterized by UGI symptoms, esophageal biopsy ≥15 eos/hpf,
AGA Institute 2007 Definition of EoEGastroenterology 2007;133:1342.
and the absence of pathologic GERD
EoEEoE GERDGERD
Possible Reasons for the Association of GERD and Esophageal Eosinophils
• GERD causes mild eosinophilia (<7 eos/hpf)
Spechler, Genta, Souza. Am J Gastroenterol 2007;102:1301.
• GERD and EoE co-exist but are unrelated
• EoE contributes to or causes GERD– Eosinophil secretory products alter esophageal
motility and permeability, and induce remodeling
• GERD contributes to or causes EoE– Reflux might cause esophageal mucosa to
produce chemokines that attract eosinophils– Increased esophageal permeability might expose
deep layers of esophageal epithelium to antigens
GERD
GERD
GERD
EoE
EoE
EoE
PPIs mighthelp these
EoE patients
“A trial of PPI therapy is recommended for patients with eosinophilic esophagitis, even if the diagnosis seems clear-cut.”
Spechler S, Genta R, Souza R. Am J Gastroenterol 2007;102:1301.
Rationale for a Trial of PPI Therapy in Patients with Esophageal Eosinophilia
Response to PPIs = GERD
PPIs only affect gastric acid secretion
Only acid-peptic disease can respond to PPIs
PPI-Responsive Esophageal Eosinophilia(PPI-REE)
• Have typical EoE symptoms and histology
• Do not have GERD by endoscopy or pH monitoring
• Exhibit a clinical and histological response to PPIs
RefluxReflux
30% to 50% of patients with symptomatic esophageal eosinophilia respond to PPIs
Possible Explanations for PPI-Responsive Esophageal Eosinophilia (PPI-REE)
1)1) Pts have subclinical GERDPts have subclinical GERD, not Ag-driven eosinophilia , not Ag-driven eosinophilia Responds to anti-secretory effects of PPIsResponds to anti-secretory effects of PPIs
2)2) Pts have Ag-driven eosinophilia (EoE)Pts have Ag-driven eosinophilia (EoE), not GERD, not GERD Responds to anti-inflammatory effects of PPIsResponds to anti-inflammatory effects of PPIs
3)3) Patients have GERD exacerbating Ag-driven EoEPatients have GERD exacerbating Ag-driven EoE Responds to both anti-secretory and Responds to both anti-secretory and anti-inflammatory effects of PPIsanti-inflammatory effects of PPIs