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2017 ; 187
(3
): 455-465
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Eosinophils from eosinophilic oesophagitis patients have T cell suppressive
capacity and express FOXP3
#MMPMID27921303
Lingblom C
; Wallander J
; Ingelsten M
; Bergquist H
; Bove M
; Saalman R
; Welin A
; Wennerås C
Clin Exp Immunol
2017[Mar]; 187
(3
): 455-465
PMID27921303
show ga
Eosinophilic esophagitis (EoE) is an antigen-driven T cell-mediated chronic
inflammatory disease where food and environmental antigens are thought to have a
role. Human eosinophils express the immunoregulatory protein galectin-10 and have
T cell suppressive capacity similar to regulatory T cells (T(regs) ). We
hypothesized that one function of eosinophils in EoE might be to regulate the T
cell-driven inflammation in the oesophagus. This was tested by evaluating the
suppressive capacity of eosinophils isolated from the blood of adult EoE patients
in a mixed lymphocyte reaction. In addition, eosinophilic expression of forkhead
box protein 3 (FOXP3), the canonical transcription factor of T(regs) , was
determined by conventional and imaging flow cytometry, quantitative polymerase
chain reaction (qPCR), confocal microscopy and immunoblotting. It was found that
blood eosinophils from EoE patients had T cell suppressive capacity, and that a
fraction of the eosinophils expressed FOXP3. A comparison of EoE eosinophils with
healthy control eosinophils indicated that the patients' eosinophils had inferior
suppressive capacity. Furthermore, a higher percentage of the EoE eosinophils
expressed FOXP3 protein compared with the healthy eosinophils, and they also had
higher FOXP3 protein and mRNA levels. FOXP3 was found in the cytosol and nucleus
of the eosinophils from both the patients and healthy individuals, contrasting
with the strict nuclear localization of FOXP3 in T(regs) . To conclude, these
findings suggest that the immunoregulatory function of eosinophils may be
impaired in EoE.