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Presentation

Immunology for Dermies: From Autoimmune to Autoinflammatory

Description

In this immunology lecture focused on dermatology, Dr. Danielle Tarter of UC Davis addresses the critical roles of both the innate and adaptive immune systems concerning various skin diseases, particularly autoimmune and autoinflammatory conditions. The session outlines T and B cell development, activation, and their functions, emphasizing that a functional adaptive response depends on a healthy innate immune response. Dr. Tarter explains mechanisms of T cell maturation in the thymus, illustrating positive and negative selection processes, and discusses how CD4 and CD8 T cells are activated through specific signaling pathways, including the importance of co-stimulation via dendritic cells. Additionally, the talk covers the role of different T cell subsets, such as TH1, TH2, TH17, and regulatory T cells, in mediating immune responses and influencing treatment decisions for skin disorders. Key to this discussion is the function of cytokines in determining T cell differentiation and responses, particularly with the introduction of biologics targeting these pathways. The innate immune system's mechanisms, including complement activation and toll-like receptors (TLRs), are also clarified, showcasing their roles in pathogen recognition and subsequent immune responses. Overall, the lecture underscores the interconnectedness of these immune systems and their relevance in managing dermatologic diseases.

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Conclusions

The innate and adaptive immune systems are interconnected, with effective adaptive immunity requiring prior innate immune activation.
T cells and B cells have distinct developmental pathways, with T cells undergoing positive and negative selection in the thymus to ensure self-tolerance and functionality.
Specific immune responses are mediated through TCR-MHC interactions and require costimulation for activation, highlighting the importance of both antigen recognition and upstream signals.
CD4 T cells differentiate into various effector subsets (e.g., TH1, TH2, TH17), each with specific roles in immune responses and disease pathogenesis.
Biologics that target specific pathways in T cell activation or cytokines can effectively manage various dermatological autoimmune conditions like psoriasis and eczema.
Alterations in immune regulation mechanisms, such as defects in the AIRE gene or FoxP3 regulatory T cells, can lead to autoimmune disorders presenting as polyendocrinopathy or eczema.
MHC haplotypes are crucial for the presentation of antigens to T cells, influencing individual immune responses and susceptibility to infections or autoimmune diseases.

Gimenez-Barcons et al. Autoimmune predisposition in Down syndrome may result from a partial central tolerance failure due to insufficient intrathymic expression of AIRE and peripheral antigens. J Immunol 2014
Bolognia, 3rd ed