Differentiate Th1, Th2, Th17, and Treg differentiation by their signature cytokines and functions.

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Study for the Immunity, Vaccines, and Cancer Test. Utilize flashcards and multiple-choice questions with detailed explanations. Prepare for excellence in your exam!

Multiple Choice

Differentiate Th1, Th2, Th17, and Treg differentiation by their signature cytokines and functions.

Explanation:
Understanding the different helper T cell subsets comes down to their signature cytokines and what they do for immunity. Th1 cells produce IFN-γ and IL-2, which activate macrophages and support cytotoxic T cell responses, driving cell-mediated immunity crucial for defending against intracellular pathogens. They are associated with responses that directly attack infected or abnormal cells. Th2 cells secrete IL-4, IL-5, and IL-13. These cytokines promote B cell activation and antibody production, including class switching to IgE, and they help defend against extracellular parasites. They also play a role in allergic reactions and humoral immunity. Th17 cells are defined by IL-17 and IL-22 production, which recruit and activate neutrophils at mucosal surfaces, bolstering defense against extracellular bacteria and fungi. They can contribute to autoimmune inflammation when dysregulated. Treg cells produce IL-10 and TGF-β, and their primary role is to dampen immune responses to maintain tolerance and prevent excessive or misdirected immunity. The described set—Th1 with IFN-γ and IL-2 supporting cell-mediated immunity; Th2 with IL-4, IL-5, IL-13 supporting humoral immunity and allergy; Th17 with IL-17 and IL-22 driving mucosal defense and potential autoimmunity; Treg with IL-10 and TGF-β suppressing immunity—accurately reflects each subset’s signature cytokines and functions. The other statements misstate these roles (for example, swapping Th1 and Th2 functions, or claiming Th17 suppresses mucosal defense, or that Treg enhance inflammation), which is why they aren’t correct.

Understanding the different helper T cell subsets comes down to their signature cytokines and what they do for immunity.

Th1 cells produce IFN-γ and IL-2, which activate macrophages and support cytotoxic T cell responses, driving cell-mediated immunity crucial for defending against intracellular pathogens. They are associated with responses that directly attack infected or abnormal cells.

Th2 cells secrete IL-4, IL-5, and IL-13. These cytokines promote B cell activation and antibody production, including class switching to IgE, and they help defend against extracellular parasites. They also play a role in allergic reactions and humoral immunity.

Th17 cells are defined by IL-17 and IL-22 production, which recruit and activate neutrophils at mucosal surfaces, bolstering defense against extracellular bacteria and fungi. They can contribute to autoimmune inflammation when dysregulated.

Treg cells produce IL-10 and TGF-β, and their primary role is to dampen immune responses to maintain tolerance and prevent excessive or misdirected immunity.

The described set—Th1 with IFN-γ and IL-2 supporting cell-mediated immunity; Th2 with IL-4, IL-5, IL-13 supporting humoral immunity and allergy; Th17 with IL-17 and IL-22 driving mucosal defense and potential autoimmunity; Treg with IL-10 and TGF-β suppressing immunity—accurately reflects each subset’s signature cytokines and functions. The other statements misstate these roles (for example, swapping Th1 and Th2 functions, or claiming Th17 suppresses mucosal defense, or that Treg enhance inflammation), which is why they aren’t correct.

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