Sensory neuron-immune cross talk tunes memory CD8+ T cell responses.

Skin scarification vaccination with vaccinia virus activates Trpv1+ sensory neurons and CGRP release, and Trpv1+ neuron absence significantly blunts memory CD8+ T cell responses in mice.

• Why it matters: Pain signaling and neuroimmune cross talk during vaccination are not well defined, leaving uncertainty about how sensory neuron activity shapes adaptive memory CD8+ T cell immunity.
• What they did: Mice were immunized with VACV by skin scarification to assess Trpv1+ neuron activation and CGRP release in skin, then tested how loss of Trpv1+ neurons affects memory CD8+ T cells; CGRP-Ramp1 effects on Langerhans cell migration were also examined.
• The result: CGRP-Ramp1 signaling promotes Langerhans cell migration from epidermis to draining lymph nodes, supporting antigen-specific CD8+ T cell responses and memory formation, implying CGRP-Ramp1 modulation could improve vaccine efficacy.

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