A Stk4-Foxp3-NF-kappa B p65 transcriptional complex promotes T-reg cell activation and homeostasis
SCIENCE IMMUNOLOGY, no.75, 2022 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Publication Date: 2022
- Journal Name: SCIENCE IMMUNOLOGY
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, BIOSIS, EMBASE, MEDLINE
- Istanbul University Affiliated: No
Abstract
The molecular programs involved in regulatory T (T-reg) cell activation and homeostasis remain incompletely understood. Here, we show that T cell receptor (TCR) signaling in T-reg cells induces the nuclear translocation of serine/threonine kinase 4 (Stk4), leading to the formation of an Stk4-NF-kappa B p65-Foxp3 complex that regulates Foxp3- and p65-dependent transcriptional programs. This complex was stabilized by Stk4-dependent phosphorylation of Foxp3 on serine-418. Stk4 deficiency in T-reg cells, either alone or in combination with its homolog Stk3, precipitated a fatal autoimmune lymphoproliferative disease in mice characterized by decreased Treg cell p65 expression and nuclear translocation, impaired NF-kappa B p65-Foxp3 complex formation, and defective Treg cell activation. In an adoptive immunotherapy model, overexpression of p65 or the phosphomimetic Foxp3S418E in Stk3/4-deficient T-reg cells ameliorated their immune regulatory defects. Our studies identify Stk4 as an essential TCR-responsive regulator of p65-Foxp3-dependent transcription that promotes T-reg cellmediated immune tolerance.