The genesis of cutaneous neurogenic inflammation is a multi-step process requiring dendritic cell aggregation.

Two rounds of nociceptor activation are necessary to initiate maximal type-17 inflammation in the skin, involving dendritic cell aggregation and neuropeptide signaling.

• Why it matters: Understanding the mechanisms of neurogenic inflammation is important because it involves complex interactions between neurons and immune cells, which are difficult to dissect and may inform treatments for inflammatory skin conditions.
• What they did: The study used optogenetic activation of Trpv1-expressing nociceptors and spatial transcriptomics to analyze immune responses, finding that two activation rounds induce dendritic cell aggregation and cytokine expression.
• The result: This work uncovers a multi-step, cell-mediated process where substance P and CGRPα coordinate dendritic cell activation, advancing knowledge of neurogenic inflammation pathways.