γδ T Cells in Autoinflammatory Diseases

Autoinflammatory diseases are characterized by inappropriate activation of innate immunity resulting in excessive or persistent inflammation in the absence of infection. γδ T cells possess innate-like properties, including rapid responsiveness to stress-induced self-molecules, phosphoantigens, and inflammasome-derived cytokines, while retaining adaptive effector functions. Neutrophils and macrophages are well-established drivers of autoinflammatory disease, but increasing evidence implicates γδ T cells as key intermediaries by linking innate immune activation to tissue-specific inflammatory pathology. Here, we review evidence that in both monogenic and multifactorial autoinflammatory diseases-including, for example, familial Mediterranean fever, hyper-immunoglobulin (Ig) D syndrome, gout, Behçet's disease, Still's disease, atherosclerosis, and neurodegenerative disorders-γδ T cells display altered frequencies, activation states, cytokine polarization, and tissue recruitment. In inflammasome-driven diseases, skewing of γδ T cells toward interleukin (IL)-17 production has been observed, often accompanied by reduced interferon (IFN)γ secretion, thereby amplifying neutrophilic inflammation and tissue damage. In other diseases, e.g., Behcet's disease, IFNγ and tumor necrosis factor (TNF)α producton predominate. Transcriptomic and tissue-based analyses support the accumulation and functional specialization of γδ T cells at sites of sterile inflammation. Collectively, these findings position γδ T cells as central amplifiers and modulators of inappropriate innate immune activation in the context of autoinflammatory diseases. Improved understanding of γδ T cell subset-specific regulation may inform novel therapeutic strategies targeting autoinflammatory diseases.