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 Immunoljournal_title
Scandinavian journal of immunologyauthors
Long Y,Zhao X,Xia C,Li X,Fan C,Liu C,Wang Cdoi
10.1111/sji.12842subject
Has Abstractpub_date
2020-06-01 00:00:00pages
e12842issue
6eissn
0300-9475issn
1365-3083journal_volume
91pub_type
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