Abstract
Background
Eosinophilic esophagitis (EoE) is an allergic gastrointestinal disease that features eosinophilic infiltration of esophageal mucosa, but the role of barrier dysfunction of the epithelium in its pathogenesis remains to be elucidated. Clinically, EoE is divided into proton pump inhibitor-non-responders (PPI-NR) and PPI-responders (PPI-R). Our main aims were to investigate the differences of expression of epidermal differential complex (EDC) proteins and desmoglein that are considered to play important roles in formation of the epidermal skin barrier between these two conditions and to seek the usefulness of the differences in pathological diagnosis. Conventional histopathological findings and allergic background were also compared.
Methods
Twenty-nine PPI-NR and 44 PPI-R were recruited, and 35 reflux esophagitis patients were also enrolled. After clinical information and histopathological findings were reviewed, immunohistochemical expression of EDC proteins (filaggrin, loricrin, and involucrin) and desmoglein in all three groups were examined and semi-quantitatively scored.
Results
Regarding allergic conditions, the prevalence of asthma was significantly higher in PPI-NR than in PPI-R. Other allergic conditions showed no differences. Histopathological findings did not exhibit the statistical difference between PPI-NR and PPI-R. However, immunostaining score of filaggrin in PPI-NR was significantly lower than in PPI-R, although the expressions of involucrin, loricrin and desmoglein demonstrated no differences.
Conclusions
The results suggest a role of reduced filaggrin expression in the difference of effectiveness of PPI treatment between PPI-NR and PPI-R. Moreover, immunohistochemical determination of filaggrin expression in EoE patients could be informative in the clinical decision of how to treat the patients.
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Acknowledgements
We thank Ms. Hiroko Wada (Department of Pathology, Shimane University School of Medicine) for support in immunohistochemistry and Dr. Akira Yasuda (Department of Medical Informatics, Shimane University School of Medicine) for support in statistical analysis.
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Conceptualization: NN; AA; KA; NI; SI; YK; RM; Methodology: NN; AA; NI; MN; RM. Formal analysis and investigation: NN; AA, NI; KA; RM. Writing—original draft preparation: NN. Writing—review and editing: AA, KA; NI; RM. Supervision: SI; YK; RM.
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The present study was performed at Shimane University Hospital in accordance with the Declaration of Helsinki, and the protocol was approved by the ethics committee of Shimane University School of Medicine. Written informed consent was obtained from all subjects.
Conflict of interest
Yoshikazu Kinoshita has received research funding from EA Pharma Co., Ltd., ZERIA Pharmaceutical Co., Ltd., and honorarium from EA Pharma Co., Ltd., Astellas Pharma Inc., AstraZeneca K.K., Mylan N.V., ZERIA Pharmaceutical Co., Ltd., Otsuka Pharmaceutical Co., Ltd., Takeda Pharmaceutical Co., Ltd., Daiichi-Sankyo Co., Ltd. Shunji Ishihara has received research funding from Takeda Pharmaceutical Co., Ltd., Astellas Pharma Inc., EA Pharma Co., Ltd., Janssen Pharmaceutical K.K., ZERIA Pharmaceutical Co., Ltd., and lecture fees from Takeda Pharmaceutical Co., Ltd. The other authors have no conflicts of interest and received no financial support for this study.
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Nagano, N., Araki, A., Ishikawa, N. et al. Immunohistochemical expression of filaggrin is decreased in proton pump inhibitor non-responders compared with proton pump inhibitor responders of eosinophilic esophagitis. Esophagus 18, 362–371 (2021). https://doi.org/10.1007/s10388-020-00781-2
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DOI: https://doi.org/10.1007/s10388-020-00781-2