Upregulated IL-17A secretion and CCR6 co-expression in Treg subsets are related to the imbalance of Treg/Th17 cells in active UC patients.

Abstract:

:Ulcerative colitis (UC) is an idiopathic, chronic inflammatory disease, which is characterized with overactive immune response. It is well established that the imbalance between Tregs and Th17 cells plays a pivotal role in pathogenesis of UC. In this study, we investigated the impact of functional changes in Treg subsets on Treg/Th17 ratio and further explored their clinical significance in the activity of UC. Treg subsets were comprehensively analysed using flow cytometry and in vitro cultured in both active and remission UC patients, of which nine active UC patients were further followed up. The correlation analyses were performed to explore the potential associations between Treg subsets and clinical indicators, as well as the impact of serum cytokines, detected by ELISA, on IL-17A secretion and CCR6 co-expression of Treg subsets. In active UC patients, we found CD45RA- FoxP3hi Tregs were obviously decreased and inversely correlated with disease activity, while CD45RA+ FoxP3lo Tregs were increased and positively correlated with disease activity. Meanwhile, IL-17A secretion and CCR6 co-expression levels in Tregs were significantly increased in active UC. Moreover, Tregs co-expressing CCR6 possesses higher level of IL-17A secretion. In nine followed up patients, we observed downregulated IL-17A secreting and CCR6 co-expression when achieving remission from active stage. In addition, IL-17A+ FoxP3+ and IL-17A+ FoxP3+ CCR6+ Tregs were positively correlated with serum IL-21 and disease activity, respectively. These findings suggested that upregulated IL-17A secretion and CCR6 co-expression in Treg subsets may be related to the imbalance between Tregs and Th17 cells and associated with the disease activity in UC patients.

journal_name

Scand J Immunol

authors

Long Y,Zhao X,Xia C,Li X,Fan C,Liu C,Wang C

doi

10.1111/sji.12842

subject

Has Abstract

pub_date

2020-06-01 00:00:00

pages

e12842

issue

6

eissn

0300-9475

issn

1365-3083

journal_volume

91

pub_type

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