Regulatory T (Treg) cells safeguard against autoimmunity and immune pathology. Because determinants of the Treg cell fate are not completely understood, we have delineated signaling events that control the de novo expression of Foxp3 in naive peripheral CD4 T cells and in thymocytes. We report that premature termination of TCR signaling and inibition of phosphatidyl inositol 3-kinase (PI3K) p11...

BACKGROUND The forkhead box transcription factor, Foxp3, is master regulator of the development and function of CD4+CD25+ T regulatory (Treg) cells that limit autoimmunity and maintain immune homeostasis. The carboxyl-terminal forkhead (FKH) domain is required for the nuclear localization and DNA binding of Foxp3. We assessed how individual FKH lysines contribute to the functions of Foxp3 in Tr...

Naturally arising CD4+ regulatory T cells, which engage in the maintenance of immunologic self-tolerance, specifically express FOXP3, which encodes a transcription-repressor protein. Genetic defects in FOXP3 cause IPEX, an X-linked autoimmune/inflammatory syndrome. With FOXP3 as a specific marker for regulatory CD4+ T cells in humans, it is now possible to determine their origin and development...

BACKGROUND IL-23/IL-23R signaling plays a pivotal role during the course of inflammatory bowel diseases (IBD). However, the underlying mechanisms are poorly characterized. Foxp3+ regulatory T cells are critical in the maintenance of gut immune homeostasis and therefore are important in preventing the development of IBD. This study was performed to clarify the association between IL-23/IL-23R si...

PURPOSE The administration of interleukin-2 (IL-2) may increase the frequency of peripherally circulating FOXP3-positive regulatory immune cells, thus potentially compromising this treatment option for patients with metastatic renal cell carcinoma. The impact of IL-2-based therapy on the accumulation of FOXP3-positive immune cells in the tumor microenvironment in metastatic renal cell carcinoma...

Recently, it was shown that peripheral blood FOXP3+CD4+ T cells are composed of three phenotypic and functionally distinct subpopulations. Two of them having in vitro suppressive effects were characterized as resting Treg cells (rTregs) and activated Treg cells (aTregs). A third subset, identified as FOXP3+ non-Tregs, does not display any suppressor activity and produce high levels of Th1 and T...

BACKGROUND Recent studies have shown that the forkhead box P3 (FOXP3) protein has a prognostic role in breast cancer. However, these results are controversial. Therefore, the aim of this meta-analysis was to clarify the prognostic role of FOXP3 expression in operable breast cancer cases. METHODS Eligible studies describing the use of FOXP3 as a prognostic factor for operable breast cancer cas...

Ovarian cancer is an immune reactive malignancy with a complex immune suppressive network that blunts successful immune eradication. This suppressive microenvironment may be mediated by recruitment or induction of CD4(+) regulatory T cells (Tregs). Our study sought to investigate the association of tumor-infiltrating CD4(+)CD25(+)FOXP3(+) Tregs, and other immune factors, with clinical outcome i...

PURPOSE Exaggerated pro-inflammatory reactions during the acute phase of Kawasaki disease (KD) suggest the role of immune dysregulation in the pathogenesis of KD. We investigated the profiles of T regulatory cells and their correlation with the clinical course of KD. METHODS Peripheral blood mononuclear cells were collected from 17 KD patients during acute febrile and subacute afebrile phases...

Objective(s):With regard to pharmacological effects of carvacrol on the respiratory system, its effect on cytokines genes expression in splenocytes of asthmatic mice was examined in this study. Materials and Methods:Splenocytes were isolated from non-sensitized (control group), sensitized mice to ovalbumin (OVA) (group S), and S animals treated with dexamethasone, and three concentrations of c...