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Cell Death & Disease

Cell Death & Disease

IF: 8.1
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TLR7-MyD88-DC-CXCL16 axis results neutrophil activation to elicit inflammatory response in pustular psoriasis

Published:9 May 2023 DOI: 10.1038/s41419-023-05815-y PMID: 37160878
Jiajing Lu, Xiaoyuan Zhong, Chunyuan Guo, Li Tang, Ning Yu, Chen Peng, Yangfeng Ding, Xunxia Bao, Jing Zhou, Yuling Shi

Abstract

Pustular psoriasis (PP) is a chronic inflammatory disease associated with multiple complications, often with hyperthermia and hypoproteinemia, and its continued progression can be life-threatening. Toll-like receptor 7 (TLR7) induces dendritic cell (DC) production of inflammatory factors that exacerbate the inflammatory response in PP. A membrane-bound chemokine expressed on DCs, CXC motif chemokine ligand 16 (CXCL16) is overexpressed in PP lesions, and neutrophils express its receptor CXC chemokine receptor 6 (CXCR6). There are few studies on the PP immune microenvironment and it is unclear whether TLR7 and CXCL16 can be used as targets in PP therapy. Skin tissue (n?=?5) and blood (n?=?20) samples were collected from PP and healthy normal controls. The skin tissue transcriptome was analyzed to obtain the differentially expressed genes, and the immune microenvironment was deciphered using pathway enrichment. Tissue sequencing analysis indicated that TLR7, CXCL16, DCs, and neutrophils were involved in the PP process. The enzyme-linked immunosorbent assay, reverse transcription-PCR, and scoring table results demonstrated that TLR7 induced DC secretion of CXCL16, which enabled neutrophil activation of the secretion of the inflammatory factors interleukin-8 (IL-8) and tumor necrosis factor alpha (TNF-α). The co-culture of neutrophils with DCs treated with TLR7 inhibitor or TLR7 agonist demonstrated that TLR7 regulated neutrophil activation, migration, and apoptosis. We constructed imiquimod-induced psoriasis-like skin lesions in wild-type, Cd11c-Cre Myd88f/f, and Mrp8-Cre Cxcr6f/f mice. The mouse models suggested that TLR7 might influence DC release of CXCL16 and neutrophil proinflammatory effects by interfering with the myeloid differentiation primary response gene 88 (MyD88) signaling pathway. In conclusion, the TLR7-MyD88-DC-CXCL16 axis is an important mechanism that promotes neutrophil migration to PP skin lesions and stimulates the inflammatory response.

Substances (4)

Materials
Procduct Name CAS Molecular Formula Supplier Price
TLR7-IN-1 1642857-69-9 C17H16N6O2 39 suppliers $96.00-$5145.50
TLR7-IN-1 1642857-69-9 C17H16N6O2 39 suppliers $96.00-$5145.50
TLR7-IN-1 1642857-69-9 C17H16N6O2 39 suppliers $96.00-$5145.50
TLR7-IN-1 1642857-69-9 C17H16N6O2 39 suppliers $96.00-$5145.50

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