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: A study was carried out to determine the functional attributes of CD4(+) CD25(+) regulatory T cells in cancer progression by suppressing antitumor immunity.
: Triple-color flow cytometry was used to study the phenotype expression of CD4(+) CD25(+) regulatory T cells and CD8(+) T cells in the peripheral blood lymphocytes (PBLs) and tumor-infiltrating lymphocytes (TILs) of 57 cases of stage I to IV endometrial carcinoma. The expression of T cell subsets was correlated with clinical prognostic parameters.
: The prevalence of CD4(+) CD25(+) T cells was significantly higher in the TILs than PBLs. The expression of CD4(+) CD25(+) regulatory T cells in cancer milieu correlated with the tumor grade, stage, and myometrium invasion. The expression of FOXP3 and GITR in CD4(+) CD25(+) regulatory T cells was lower in PBLs than TILs. Most tumor-infiltrating CD8(+) T cells were CD28(-) CD45RA(-) CD45RO(+) CCR7(-), suggesting good terminal differentiation. Most of them had an activated role with CD69(+) CD103(+) CD152(+). Functionally, both granzyme B and perforin were scarcely expressed in peripheral regulatory T cells but were highly expressed in peripheral regulatory T cells in the tumor microenvironment. In contrast, CD8(+) cytotoxic T cells derived from PBLs expressed both granzyme B and perforin, and at significantly higher levels than in TILs. Further functional assays demonstrated that Th1 cytokines and cytotoxic molecules can be synchronously up-regulated in CD8(+) cytotoxic T cells.
: Regulatory T cells in the tumor microenvironment may abrogate CD8(+) T cell cytotoxicity in a granzyme B- and perforin-dependent conduit. Decreases in both Th1 cytokines and cytotoxic enzymes are relevant for regulatory T cell-mediated restraint of tumor clearance in vivo. Of clinical significance, the expression of regulatory T cells in TILs may mediate T cell immune repression within cancer milieu and thus greatly correlate with cancer progression. Cancer 2010. (c) 2010 American Cancer Society.
Department of Obstetrics and Gynecology, National Taiwan University Hospital, Taipei, Taiwan.
This article was published in the following journal.
To gain novel insights into the immunopathogenesis of systemic lupus erythematosus we have analyzed gene expression data from isolated CD4(+) T cells, CD8(+) T cells, CD19(+) B cells, and CD56(+) NK-c...
To protect host against immune-mediated damage, immune responses are tightly regulated. The regulation of immune responses is mediated by various populations of mature immune cells, such as T regulato...
FoxP3-expressing regulatory T (Treg) cells are essential for maintaining immune homeostasis. Activated Treg cells undergo further differentiation into an effector state that highly expresses genes cri...
Invariant NKT cells differentiate into three predominant effector lineages in the steady state. To understand these lineages, we sorted undifferentiated invariant NK T progenitor cells and each effect...
Tumor cells have evolved sophisticated means of escape from the host immune system. To date, several important immunological phenomena have been demonstrated in peripheral blood as well as within tumo...
The cause of Inflammatory Bowl Disease (IBD) is not known, but studies from patients with IBD have found that these patients make unusually strong immune responses to their own intestinal ...
Regulatory T cells (Tregs) suppress cytopathic immune responses and inhibit transplant rejection. Our goal is to exploit the Treg suppressive properties to induce transplantation tolerance...
The trial is randomized prospective study to examine the effects of subcutaneous immunotherapy on the adaptive immune system. The trial includes 30 participants randomized to treatment or ...
We postulate that the combination of IL-2 and GM-CSF immunotherapy will efficiently mobilize autologous peripheral blood stem cells and activated immune effector cells in patients with a h...
The purpose of this research study is to develop a vaccine against Human immunodeficiency virus (HIV), a disease that causes AIDS in people,. The investigator will be looking at viruses s...
A classification of T-lymphocytes, especially into helper/inducer, suppressor/effector, and cytotoxic subsets, based on structurally or functionally different populations of cells.
A condition caused by the excessive secretion of ANDROGENS from the ADRENAL CORTEX; the OVARIES; or the TESTES. The clinical significance in males is negligible. In women, the common manifestations are HIRSUTISM and VIRILISM as seen in patients with POLYCYSTIC OVARY SYNDROME and ADRENOCORTICAL HYPERFUNCTION.
CD4-positive T cells that inhibit immunopathology or autoimmune disease in vivo. They inhibit the immune response by influencing the activity of other cell types. Regulatory T-cells include naturally occurring CD4+CD25+ cells, IL-10 secreting Tr1 cells, and Th3 cells.
A spectrum of disorders characterized by clonal expansions of the peripheral blood LYMPHOCYTE populations known as large granular lymphocytes which contain abundant cytoplasm and azurophilic granules. Subtypes develop from either CD3-negative NATURAL KILLER CELLS or CD3-positive T-CELLS. The clinical course of both subtypes can vary from spontaneous regression to progressive, malignant disease.
A long pro-domain caspase that contains a death effector domain in its pro-domain region. Caspase 8 plays a role in APOPTOSIS by cleaving and activating EFFECTOR CASPASES. Activation of this enzyme can occur via the interaction of its N-terminal death effector domain with DEATH DOMAIN RECEPTOR SIGNALING ADAPTOR PROTEINS.
Head and neck cancers
Cancer can occur in any of the tissues or organs in the head and neck. There are over 30 different places that cancer can develop in the head and neck area. Mouth cancers (oral cancers) - Mouth cancer can develop on the lip, the tongue, the floor...
An antibody is a protein produced by the body's immune system when it detects harmful substances, called antigens. Examples of antigens include microorganisms (such as bacteria, fungi, parasites, and viruses) and chemicals. Antibodies may be produc...
Blood is a specialized bodily fluid that delivers necessary substances to the body's cells (in animals) – such as nutrients and oxygen – and transports waste products away from those same cells. In vertebrates, it is composed of blo...