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ABSTRACT

Cytokines interact with their receptor complexes to orchestrate diverse processes-from immune responses to behavioral modulation. Interleukin-17A (IL-17A) mediates protective immune responses by binding to IL-17 receptor A (IL-17RA) and IL-17RC subunits. IL-17A also modulates social interaction, yet the role of cytokine receptors in this process and their expression in the brain remains poorly characterized. Here, we mapped the brain-region-specific expression of all major IL-17R subunits and found that in addition to IL-17RA, IL-17RB-but not IL-17RC-plays a role in social behaviors through its expression in the cortex. We further showed that IL-17E, expressed in cortical neurons, enhances social interaction by acting on IL-17RA- and IL-17RB-expressing neurons. These findings highlight an IL-17 circuit within the cortex that modulates social behaviors. Thus, characterizing spatially restricted cytokine receptor expression can be leveraged to elucidate how cytokines function as critical messengers mediating neuroimmune interactions to shape animal behaviors.

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