miRNA92a targets KLF2 and the phosphatase PTEN signaling to promote human T follicular helper precursors in T1D islet autoimmunity.
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Authors
Serr, IsabelleFürst, Rainer W
Ott, Verena B
Scherm, Martin G
Nikolaev, Alexei
Gökmen, Füsun
Kälin, Stefanie
Zillmer, Stephanie
Bunk, Melanie
Weigmann, Benno
Kunschke, Nicole
Loretz, Brigitta
Lehr, Claus Michael

Kirchner, Benedikt
Haase, Bettina
Pfaffl, Michael
Waisman, Ari
Willis, Richard A
Ziegler, Anette-G
Daniel, Carolin
Issue Date
2016
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Show full item recordAbstract
Aberrant immune activation mediated by T effector cell populations is pivotal in the onset of autoimmunity in type 1 diabetes (T1D). T follicular helper (TFH) cells are essential in the induction of high-affinity antibodies, and their precursor memory compartment circulates in the blood. The role of TFH precursors in the onset of islet autoimmunity and signaling pathways regulating their differentiation is incompletely understood. Here, we provide direct evidence that during onset of islet autoimmunity, the insulin-specific target T-cell population is enriched with a C-X-C chemokine receptor type 5 (CXCR5)+CD4+ TFH precursor phenotype. During onset of islet autoimmunity, the frequency of TFH precursors was controlled by high expression of microRNA92a (miRNA92a). miRNA92a-mediated TFH precursor induction was regulated by phosphatase and tension homolog (PTEN) - phosphoinositol-3-kinase (PI3K) signaling involving PTEN and forkhead box protein O1 (Foxo1), supporting autoantibody generation and triggering the onset of islet autoimmunity. Moreover, we identify Krueppel-like factor 2 (KLF2) as a target of miRNA92a in regulating human TFH precursor induction. Importantly, a miRNA92a antagomir completely blocked induction of human TFH precursors in vitro. More importantly, in vivo application of a miRNA92a antagomir to nonobese diabetic (NOD) mice with ongoing islet autoimmunity resulted in a significant reduction of TFH precursors in peripheral blood and pancreatic lymph nodes. Moreover, miRNA92a antagomir application reduced immune infiltration and activation in pancreata of NOD mice as well as humanized NOD Scid IL2 receptor gamma chain knockout (NSG) human leucocyte antigen (HLA)-DQ8 transgenic animals. We therefore propose that miRNA92a and the PTEN-PI3K-KLF2 signaling network could function as targets for innovative precision medicines to reduce T1D islet autoimmunity.Citation
miRNA92a targets KLF2 and the phosphatase PTEN signaling to promote human T follicular helper precursors in T1D islet autoimmunity. 2016, 113 (43):E6659-E6668 Proc. Natl. Acad. Sci. U.S.A.Affiliation
Helmholtz-Institut für pharmazeutische Forschung Saarland, Universitätscampus E8.1, 66123 Saarbrücken, Germany.PubMed ID
27791035PubMed Central ID
PMC5087025Additional Links
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5087025/Type
ArticleLanguage
enISSN
1091-6490ae974a485f413a2113503eed53cd6c53
10.1073/pnas.1606646113
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- Creative Commons
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by-nc-sa/4.0/
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