Abstract:
BACKGROUND AND OBJECTIVES:Regulatory T cells (Tregs) play an important role in maintaining tolerance to self-antigens. Defects in the frequency and function of polyclonal Tregs have been reported in type 1 diabetes (T1D). However, characteristics of proinsulin (PI)-specific Tregs in human T1D have not yet been explored. Therefore, we aimed to characterize PI-specific Tregs in two distinct pathophysiological subtypes of T1D, juvenile-onset T1D (JOT1D) and adult-onset T1D (AOT1D), distinguished by the age of onset. METHODS:Peripheral blood mononuclear cells of the recruited subjects were stimulated in vitro with PI-derived peptides. PI-specific Tregs were characterized by flow cytometry using the combination of markers CD25, CD137, FOXP3 and CD45RA. RESULTS:Firstly, we observed similar frequencies of polyclonal Tregs in the T1D (n = 25) and healthy control (HC) (n = 20) subjects (P = 0.96), with a positive correlation between age and frequency of polyclonal Tregs (r = +0.35, P = 0.04). While the frequency of polyclonal Tregs was higher in AOT1D group (P = 0.02), both JOT1D (n = 14) and AOT1D groups (n = 11) had a comparable frequency of PI-specific Tregs in their peripheral blood. The frequency of PI-specific memory Tregs was significantly high in both the JOT1D (P = 0.02) and AOT1D (P = 0.009) groups compared to their respective HC groups (n = 10). Finally, we observed no significant difference in the expression of FOXP3 and IL-2 receptor in PI-specific Tregs in all the groups. CONCLUSIONS:Unlike polyclonal Tregs, both T1D subtypes harbor comparable frequencies of PI-specific Tregs. Chronic antigen presentation results in a distinct memory-like phenotype of PI-specific Tregs in these subjects irrespective of the age of disease onset.
journal_name
Pediatr Diabetesjournal_title
Pediatric diabetesauthors
Paul M,Dayal D,Bhansali A,Sachdeva Ndoi
10.1111/pedi.12813subject
Has Abstractpub_date
2019-05-01 00:00:00pages
271-281issue
3eissn
1399-543Xissn
1399-5448journal_volume
20pub_type
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journal_title:Pediatric diabetes
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pub_type: 杂志文章
doi:10.1046/j.1399543x.2000.010409.x
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pub_type: 杂志文章,多中心研究
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doi:10.1111/j.1399-5448.2012.00908.x
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doi:10.1111/j.1399-5448.2009.00636.x
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更新日期:2020-12-01 00:00:00
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doi:10.1111/j.1399-5448.2007.00241.x
更新日期:2007-12-01 00:00:00
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doi:10.1111/j.1399-5448.2009.00601.x
更新日期:2010-08-01 00:00:00
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