Keratinocyte FABP5-VCP complex mediates recruitment of neutrophils in psoriasis.

Keratinocyte FABP5-VCP complex mediates recruitment of neutrophils in psoriasis.
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DOI:
10.1016/j.celrep.2023.113449
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发表时间:
2023-11-28
期刊:
影响因子:
8.8
通讯作者:
--
中科院分区:
生物学1区
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顽固性银屑病的标志之一是皮肤病变中的中性粒细胞浸润。然而,中性粒细胞趋化和激活的详细分子机制仍不清楚。在此,我们证明在人类银屑病和银屑病小鼠模型的皮肤中,表皮脂肪酸结合蛋白(E - FABP,FABP5)显著上调。通过全身性敲除以及角质形成细胞条件性(Krt6a - Cre)敲除小鼠中的FABP5基因,但髓系细胞条件性(LysM - Cre)敲除则不会,可减轻银屑病症状。免疫表型分析表明,FABP5缺乏特异性地减少了Ly6G +中性粒细胞在皮肤中的募集。从机制上讲,活化的角质形成细胞产生趋化因子和细胞因子,以FABP5依赖的方式触发中性粒细胞趋化和激活。蛋白质组学分析进一步确定FABP5与含缬酪肽蛋白(VCP)相互作用,VCP是NF - κB信号激活的关键因子。沉默FABP5、VCP或两者均可抑制NF - κB /中性粒细胞趋化信号。总之,这些数据表明FABP5失调是促进银屑病发病机制中NF - κB信号传导和中性粒细胞浸润的一种分子机制。 郝等人表明,角质形成细胞中FABP5的表达通过增强中性粒细胞浸润和激活来促进银屑病发病。FABP5是治疗银屑病的一个有前景的治疗靶点。
One of the hallmarks of intractable psoriasis is neutrophil infiltration in skin lesions. However, detailed molecular mechanisms of neutrophil chemotaxis and activation remain unclear. Here, we demonstrate a significant upregulation of epidermal fatty acid binding protein (E-FABP, FABP5) in the skin of human psoriasis and psoriatic mouse models. Genetic deletion of FABP5 in mice by global knockout and keratinocyte conditional (Krt6a-Cre) knockout, but not myeloid cell conditional (LysM-Cre) knockout, attenuates psoriatic symptoms. Immunophenotypic analysis shows that FABP5 deficiency specifically reduces skin recruitment of Ly6G+ neutrophils. Mechanistically, activated keratinocytes produce chemokines and cytokines that trigger neutrophil chemotaxis and activation in an FABP5-dependent manner. Proteomic analysis further identifies that FABP5 interacts with valosin-containing protein (VCP), a key player in NF-κB signaling activation. Silencing of FABP5, VCP, or both inhibits NF-κB/neutrophil chemotaxis signaling. Collectively, these data demonstrate dysregulated FABP5 as a molecular mechanism promoting NF-κB signaling and neutrophil infiltration in psoriasis pathogenesis. Hao et al. show that FABP5 expression in keratinocytes promotes psoriasis pathogenesis through enhancing neutrophil infiltration and activation. FABP5 represents a promising therapeutic target for the treatment of psoriasis.
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