The Biology of the T-Cell Antigen Receptor and Its Role in the Skin Immune System

T lymphocytes play an important role in the generation, maintenance, and specificity of the skin immune response. T cells are the predominant class of lymphocytes found in the skin and moderate many of the initial immune responses, such as allergic contact and delayed-type hypersensitivity. In addition, the primary class of cutaneous lymphomas is believed to be of T-cell lineage. All of the antigen and MHC-restriction capabilities are manifested by the T-cell antigen receptor (TCR), the study of which has been the primary focus of immunologists for many years. Proper recognition of antigen and MHC-restriction. by the TCR is necessary for the activation of the T cell. The analysis of the TCR has proved to be a useful tool for the diagnosis of lymphomas and the study of the normal skin immune system. Recently, TCR subset populations were found to be expressed specifically within the epidermis and have been hypothesized to be important in the maintenance of immunity in the skin immune system. In this article, we discuss the relationship of T cells to the immune system and the importance of the TCR to its function and homeostasis