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Neutrophil extracellular trap-associated RNA and LL37 enable self-amplifying inflammation in psoriasis.

Nat Commun. 2020 Jan 08;11(1):105
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摘要


Psoriasis is an inflammatory skin disease with strong neutrophil infiltration and high levels of the antimicrobial peptide, LL37. LL37 in complex with DNA and RNA is thought to initiate disease exacerbation via plasmacytoid dendritic cells. However, the source of nucleic acids supposed to start this initial inflammatory event remains unknown. We show here that primary murine and human mount a fulminant and self-propagating neutrophil extracellular trap (NET) and cytokine response, but independently of the canonical NET component, DNA. Unexpectedly, RNA, which is abundant in NETs and psoriatic but not healthy skin, in complex with LL37 triggered TLR8/TLR13-mediated cytokine and NET release by duanyu1451s in vitro and in vivo. Transfer of NETs to naive human duanyu1451s prompts additional NET release, promoting further inflammation. Our study thus uncovers a self-propagating vicious cycle contributing to chronic inflammation in psoriasis, and NET-associated RNA (naRNA) as a physiologically relevant NET component.

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