blood_and_immune_upper_slim has plasma membrane part T cell gamma-delta T cell gd T cell gamma-delta T lymphocyte ZFA:0009336 gamma-delta T-cell A T cell that expresses a gamma-delta T cell receptor complex. Gamma-delta T cells, also referred to as γδ T cells, are a distinct subset of T lymphocytes that play unique roles in the immune system. They are defined by expression of heterodimeric T-cell receptors (TCRs) comprised of γ and δ chains. They share characteristics with both innate and adaptive immune cells, and unlike alpha-beta (αβ) T cells, they do not require antigen processing and Major Histocompatibility Complex (MHC) presentation for the recognition of antigens. This unique response mechanism allows them to contribute to rapid immune responses, particularly in the context of tissue injury and infection. Depending on the γδ TCR and the context, different subsets of gamma-delta T cells perform a variety of functions which range from regulating thermogenesis in adipose tissue to controlling the plasticity of neuronal synapses in the central nervous system. A key function is in tissue homeostasis and surveillance against infectious agents and tumors. They can carry out their defense role through several mechanisms, such as cytokine production, killing of target cells, and regulation of other immune cell responses. In response to pathogens, these cells produce a wide range of cytokines, including interferon-gamma (IFN-γ), tumor necrosis factor-alpha (TNF-α), and interleukin-17 (IL-17), which help recruit and activate other immune cells to the site of infection. Furthermore, gamma-delta T cells can directly kill infected cells or cancerous cells, which is instrumental in preventing the spread of infection or malignancy. Despite the broadly generalized role in immunity, the function of gamma-delta T cells can vastly vary depending on their tissue location. In the skin and mucosal tissues, they provide quick response to pathogens, while in secondary lymphoid organs, their regulatory functions shape the adaptive immune response. In recent years, their role in the context of autoimmunity and cancer has gained attention, with emerging studies suggesting their potential for immunotherapeutic interventions. Thus, gamma-delta T cells serve as vital components of the immune system, providing a versatile defense mechanism against a range of pathogenic targets. (This extended description was generated by ChatGPT and reviewed by the CellGuide team, who added references, and by the CL editors, who approved it for inclusion in CL. It may contain information that applies only to some subtypes and species, and so should not be considered definitional.) gammadelta T cell Note that gamma-delta T cells have both thymic and extrathymic differentiation pathways. https://cellxgene.cziscience.com/cellguide/CL_0000798 gamma-delta T-lymphocyte gamma-delta T cell receptor complex Homo sapiens