Abstract T Cell Factor 1, or TCF1, is a transcription factor required for thymic cell development, memory formation, and maintenance of exhausted/dysfunctional stem/progenitors in tumors chronic infection. However, TCF1 regulation function during activation not well-understood. We analyzed the expression kinetics Tcf7 mRNA, encoding (RNA-SEQ) protein (flow cytometry western immunoblotting) CD8 ...

T cell exhaustion and loss of memory potential occur during many chronic viral infections and cancer. We investigated when during chronic viral infection virus-specific CD8 T cells lose the potential to form memory. Virus-specific CD8 T cells from established chronic infection were unable to become memory CD8 T cells if removed from infection. However, at earlier stages of chronic infection, th...

Functional impairment of antigen-specific T cells is a defining characteristic of many chronic infections, but the underlying mechanisms of T-cell dysfunction are not well understood. To address this question, we analyzed genes expressed in functionally impaired virus-specific CD8 T cells present in mice chronically infected with lymphocytic choriomeningitis virus (LCMV), and compared these wit...

Experimental autoimmune uveoretinitis is a model for noninfectious posterior segment intraocular inflammation in humans. Although this disease is CD4(+) T cell dependent, in the persistent phase of disease CD8(+) T cells accumulate. We show that these are effector memory CD8(+) T cells that differ from their splenic counterparts with respect to surface expression of CD69, CD103, and Ly6C. These...

Background Rheumatoid arthritis (RA) is a chronic autoimmune disorder that mainly affects the joints. The synovium primary site of inflammatory process, in which local immune response develops. Peripheral helper T cells (Tph) are population CXCR5 - PD1 hi CD4 + thought to provide help for ectopic B cell response. However, whether there heterogeneity among Tph not clear. Objectives To identify f...

NK/T-cell ratios predict disease activity in relapsing remitting multiple sclerosis (RRMS). We investigated 50 RRMS patients whether interleukin-2 receptor alpha-chain (IL-2R?) expression and shedding associates with balance, as suggested by daclizumab-trials RRMS. A subsample (N = 31) was genotyped for IL2RA-associated MS risk SNPs. CD56bright NK-cell/IL-17A+CD4+ T-cell correlated negatively p...

idiopathic cd4+ lymphocytopenia is a rare combined immunodeficiency disease, characterized by low cd4+ t-cell count and increased susceptibility to opportunistic infections, autoimmunity and malignancies after exclusion of secondary forms of cd4 lymphocytopenia. here we present a 13-year old boy who was referred to our center because of destructive ulceration of soft and hard palates with exten...

Background: Type 1 diabetes (T1D) is a T cell mediated autoimmune disease targeting the insulin-producing β cells within pancreatic islets. Autoimmune diseases may develop as a consequence of altered balance between regulatory (Tregs) and autoreactive T cells. Objectives: To evaluate Treg cells frequency and suppressive function in the peripheral blood of newly diagnosed T1D patients in compari...