objective(s): regulatory t cells, including cd4+cd25+fox3+ and cd8+cd28- cells play an important role in regulating the balance between immunity and tolerance. since multiple sclerosis is an inflammatory autoimmune disease, regulatory t cells are considered to be involved in its pathogenesis. in this study, we investigated the circulatory numbers of the two mentioned types of regulatory t cells...

helicobacter pylori (h. pylori) is a gram-negative bacterium that colonizes the human stomach and affects more than half of the global human population. this microorganism shows variations in its geographical distribution and causes chronic gastritis, peptic ulcer, gastric adenocarcinoma and mucosa-associated lymphoid tissue lymphoma. the development of these clinical entities depends on the ba...

soluble forms of nonclassical human leukocyte antigen (hla)-g have recently been suggested as immunomodulatory factors in multiple sclerosis (ms). hla-g inhibits the effecter function of t cells and natural killer (nk) cells. also regulatory t cells (treg) are considered as pivotal players in ms pathogenesis. thus, we aimed to evaluate the presence of hla-g molecules and treg cells in relapsing...

conclusions the inhibition of tregs is a novel therapeutic approach to cure chronically hbv infected patients. however, further studies are needed to investigate the safety and efficacy of this approach. results considering the increased levels of regulatory cytokines and also regulatory t cells (tregs) during chb, it seems that these cells are deeply involved in chb infection. the inhibition o...

conclusions the changes of treg and th17 cells and their associated cytokines were related to virological and biochemical responses. results in complete and partial-responders, treg cells frequencies and il-10, tgf-β1, il-23 levels were all decreased significantly after na therapy, while th17 cells and the il-17 levels were increased slightly. treg/th17 ratio was only dramatically declined in c...

background: regulatory t cells (tregs) have been involved in impaired immunity and may have a pivotal role in persistence of viral infections. objective: to develop a simple and reliable in-house three color flow cytometery of peripheral blood to understand the role of hcv infection in the increase of tregs. methods: the level of naturally occurring cd4+cd25+foxp3+ regulatory t cells (ntregs) i...

immune thrombocytopenic  purpura (itp) is an autoimmune bleeding disorder characterized by production  of auto-antibodies against platelet antigens. it is obvious that regulatory t cells (tregs) have a major role in controlling immune homeostasis and preventing autoimmunity. to investigate the frequency and functions of tregs, twenty itp patients and twenty age- and sex- matched healthy control...

t regulatory cells play a crucial role in immunological unresponsiveness to self- antigens and in suppressing excessive immune responses deleterious to the host. t regulatory cells are produced in the thymus as a functionally mature subpopulation of t cells. they can be induced from naive t cells in the periphery and express their marker as a forkhead/winged helix transcription factor called fo...

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...

One of the essential protection mechanisms of immune system is Treg cells which play an important role in maintenance ofimmune homeostasis. However, they may also inhibit immune functions against tumor cells. It has been reported that Treg cellsare increased in patients suffering from different types of cancer. Increased number of Treg cells has been shown in tumor lymphnodes, peripheral blood,...