Which cytokine drives eosinophilic recruitment?

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Multiple Choice

Which cytokine drives eosinophilic recruitment?

IL-5 is the signal that specifically drives eosinophilic recruitment and survival. It acts as the eosinophilopoietic growth factor, stimulating the bone marrow to produce eosinophils and release them into the circulation, and it helps keep eosinils alive once they reach tissues. In allergic or parasitic contexts, Th2 cells (and other sources) release IL-5, which directly increases eosinophil numbers at sites of inflammation and enhances their responsiveness. Other cytokines here have different roles. IL-4 mainly promotes Th2 differentiation and IgE class switching, which supports allergic responses but doesn’t directly recruit eosinophils. TNF-alpha is a broad pro-inflammatory cytokine that amplifies inflammation in general, not specifically eosinophil recruitment. IL-2 is focused on T cell proliferation and activation, not eosinophils. So, IL-5 is the best fit because of its specific function in generating and sustaining eosinophils and guiding their accumulation at inflammatory sites.

IL-5 is the signal that specifically drives eosinophilic recruitment and survival. It acts as the eosinophilopoietic growth factor, stimulating the bone marrow to produce eosinophils and release them into the circulation, and it helps keep eosinils alive once they reach tissues. In allergic or parasitic contexts, Th2 cells (and other sources) release IL-5, which directly increases eosinophil numbers at sites of inflammation and enhances their responsiveness.

Other cytokines here have different roles. IL-4 mainly promotes Th2 differentiation and IgE class switching, which supports allergic responses but doesn’t directly recruit eosinophils. TNF-alpha is a broad pro-inflammatory cytokine that amplifies inflammation in general, not specifically eosinophil recruitment. IL-2 is focused on T cell proliferation and activation, not eosinophils.

So, IL-5 is the best fit because of its specific function in generating and sustaining eosinophils and guiding their accumulation at inflammatory sites.

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