背景:了解炎症性皮肤病的病理生理学,尤其是在蛋白质组水平,由于缺乏足够的现场数据而受到严重阻碍。
目的:使用皮肤微透析表征炎症性皮肤病的皮损和非皮损。
方法:特应性皮炎患者的皮肤微透析样本(AD,n=6),寻常型牛皮癣(PSO,n=7)或结节性痒疹(PN,n=6),以及健康对照(n=7)进行蛋白质组学和多重细胞因子分析。皮肤活检标本的单细胞RNA测序用于鉴定细胞因子的细胞来源。
结果:在前20个丰富的GO注释中,NAD代谢过程,细胞分泌的调节,与非病变皮肤和对照组相比,病变AD皮肤的微透析液中丙酮酸代谢过程升高。这三组中的前20个富集的KEGG途径几乎完全重叠。相比之下,在KEGG通路分析中,PSO或PN患者的非病灶皮肤和对照皮肤未显示与病灶皮肤重叠.PSO患者的皮损,但不是AD或PN,与非病变皮肤相比,MCP-1的蛋白质水平显着升高。IL-8在病灶与非病灶AD和PSO皮肤中升高,而IL-12p40和IL-22仅在病变PSO皮肤中更高。整合的单细胞RNA-seq数据揭示了AD中这些细胞因子的相同细胞来源,PSO和PN。
结论:基于微量透析液,病变PSO和PN皮肤的蛋白质组学数据,但不是AD病变皮肤,与非皮损明显不同。IL-8、IL-22、MCP-1和IL-12p40可能是微创分子谱分析的合适标志物。
BACKGROUND: Insight into the pathophysiology of inflammatory skin diseases, especially at the proteomic level, is severely hampered by the lack of adequate in situ data.
OBJECTIVE: Characterize lesional and nonlesional skin of inflammatory skin diseases using skin microdialysis.
METHODS: Skin microdialysis samples from patients with atopic dermatitis (AD, n=6), psoriasis vulgaris (PSO, n=7) or prurigo nodularis (PN, n=6), as well as healthy controls (n=7) were subjected to proteomics and multiplex cytokine analysis. Single-cell RNA sequencing of skin biopsy specimens was used to identify the cellular origin of cytokines.
RESULTS: Among the top 20 enriched GO annotations, NAD metabolic process, regulation of secretion by cell, and pyruvate metabolic process were elevated in microdialysates from lesional AD skin compared with both nonlesional skin and controls. The top 20 enriched KEGG pathways in these three groups overlapped almost completely. In contrast, nonlesional skin from patients with PSO or PN and control skin showed no overlap with lesional skin in this KEGG pathway analysis. Lesional skin from patients with PSO, but not AD or PN, showed significantly elevated protein levels of MCP-1 compared to nonlesional skin. IL-8 was elevated in lesional vs nonlesional AD and PSO skin, whereas IL-12p40 and IL-22 were higher only in lesional PSO skin. Integrated single-cell RNA-seq data revealed identical cellular sources of these cytokines in AD, PSO and PN.
CONCLUSIONS: Based on microdialysate, proteomic data of lesional PSO and PN skin, but not lesional AD skin, differed significantly from those of nonlesional skin. IL-8, IL-22, MCP-1 and IL-12p40 might be suitable markers for minimally invasive molecular profiling.