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Many types of human cancer cells overexpress PD-L1, which, when bound to PD-1 on T-cells, suppresses the immune system and enables immune evasion. [10] PD-1 itself is a transmembrane protein in the immunoglobulin superfamily expressed on activated T-cells, acting as a negative immune regulator that limits CD8-positive T-cell expansion and ...
Interleukin-2 is an important immune system regulator necessary for the clone expansion and survival of activated lymphocytes T. Its effects are mediated by the trimer cell surface receptor IL-2a, consisting of the α, β, and γ chains. The IL-2a (CD25, T-cell activation antigen, TAC) is expressed only by the already-activated T lymphocytes.
Immunosuppression is a reduction of the activation or efficacy of the immune system. Some portions of the immune system itself have immunosuppressive effects on other parts of the immune system, and immunosuppression may occur as an adverse reaction to treatment of other conditions. [1] [2]
In the cancer disease state, the interaction of PD-L1 on the tumor cells with PD-1 on a T-cell reduces T-cell function signals to prevent the immune system from attacking the tumor cells. [9] Use of an inhibitor that blocks the interaction of PD-L1 with the PD-1 receptor can prevent the cancer from evading the immune system in this way. [9]
Thus they serve as immunomodulators in immunotherapy (therapy that makes use of immune responses), which can be helpful in treating cancer (where targeted therapy often relies on the immune system being used to attack cancer cells) and in treating autoimmune diseases (in which the immune system attacks the self), such as some kinds of arthritis ...
Immunotherapy or biological therapy is the treatment of disease by activating or suppressing the immune system. Immunotherapy is designed to elicit or amplify an immune response are classified as activation immunotherapies, while immunotherapies that reduce or suppress are classified as suppression immunotherapies .
At the same time, viruses have co-evolved evasion machinery to address the many ways that host organisms attempt to eradicate them. DNA and RNA viruses use complex methods to evade immune cell detection through disruption of the Interferon Signaling Pathway, remodeling of cellular architecture, targeted gene silencing, and recognition protein ...
In the future, the use or knockouts of immunoevasins (where mutated or deleted immunoevasin genes would not interfere with antigen presentation on MHC I complexes upon viral infection, resulting in recognition and targeting of infected cells by T cells) may be used for vaccine development for HCMV, gene therapy, transplantation and tumor ...