OBJECTIVE CD4+CD25+ regulatory T cells (Tregs) plays a key role in maintaining immune tolerance. IgAN has a close relationship with the immune response. However the significance of CD4+CD25+ T cells to improve renal function of IgAN patients is not clear. The purpose of this study is to evaluate renal function of experimental IgAN rats treated by CD4+CD25+ Tregs cells. MATERIALS AND METHODS C...

Thymic-derived CD25+ CD4+ T regulatory cells (Tregs) suppress immune responses, including transplantation. Here we evaluated the ability of dendritic cells (DCs) to expand alloantigen-specific Tregs in the mixed leukocyte reaction (MLR) that develops from polyclonal populations of T cells. The allogeneic DCs, when supplemented with IL-2 in the cultures, were much more effective than bulk spleen...

Increased CD4+CD25+Foxp3+ regulatory T cells (Tregs) predict poor prognosis in renal cell carcinoma (RCC). The aim of this study was to investigate the underlying causes of the aberrant accumulation of Tregs in RCC. pcDNA3.1-hCOX-2 and control pcDNA3.1 were transfected into the RCC cell line OS-RC-2. Under stimulation of anti-CD3/CD28 antibody and APC cells, isolated CD4+Foxp3- T cells were co-...

Immune homeostasis in peripheral tissues is achieved by maintaining a balance between pathogenic effector T cells (Teffs) and protective Foxp3(+) regulatory T cells (Tregs). Using a mouse model of an inducible tissue Ag, we demonstrate that Ag persistence is a major determinant of the relative frequencies of Teffs and Tregs. Encounter of transferred naive CD4(+) T cells with transiently express...

Foxp3(+) regulatory T cells (Tregs) are crucial for preventing autoimmunity. We have demonstrated that depletion of Foxp3(+) Tregs results in the development of a scurfy-like disease, indicating that Foxp3(-) effector T cells are sufficient to induce autoimmunity. It has been postulated that nonfunctional Tregs carrying potentially self-reactive T cell receptors may contribute to scurfy (sf) pa...

Foxp3(+) regulatory T cells (Tregs) are often highly enriched within the tumor-infiltrating T cell pool. Using a well-characterised model of carcinogen-induced fibrosarcomas we show that the enriched tumor-infiltrating Treg population comprises largely of CXCR3(+) T-bet(+) 'TH1-like' Tregs which are thymus-derived Helios(+) cells. Whilst IL-2 maintains homeostatic ratios of Tregs in lymphoid or...

The immune system prevents establishment and progression of cancer through innate and adaptive surveillance. However, some cancerous cells successfully evade the immune system. Regulatory T-cells (Tregs) facilitate such evasion. Tregs may be the factor responsible for the limited success of human tumor immunotherapy to date. To improve immunotherapy, it is thought that the number of Tregs and t...

Cytotoxic lymphodepletion therapies augment antitumor immune responses. The generation and therapeutic efficacy of antitumor effector T cells (T(E)s) are enhanced during recovery from lymphopenia. Although the effects of lymphodepletion on naive T cells (T(N)s) and T(E)s have been studied extensively, the influence of lymphodepletion on suppressor cells remains poorly understood. In this study,...

CD4(+) regulatory T cells (Tregs) accumulate at tumor sites and play a critical role in the suppression of immune responses against tumor cells. In this study, we show that two immunodominant epitopes derived from the tumor Ags (TAs) NY-ESO-1 and TRAG-3 stimulate both CD4+ Th cells and Tregs. TA-specific Tregs inhibit the proliferation of allogenic T cells, act in a cell-to-cell contact depende...

INTRODUCTION The inflammatory enzyme indoleamine 2, 3-dioxygenase (IDO) participates in immune tolerance and promotes immune escape of IDO+ tumors. A recent hypothesis suggested that IDO may contribute to the differentiation of new T regulatory cells (Tregs) from naive CD4+ T cells. In this study we investigated the role of IDO in induction of immunosuppression in breast cancer by increasing th...