Leslie Eric, Miller Marina, Lafuze Allison, Svyatskaya Sofya, Choi Gil-Soon, Broide David H
Department of Medicine, University of California, San Diego; La Jolla, California, USA.
Department of Internal Medicine, Kosin University College of Medicine, Republic of Korea.
medRxiv. 2024 Jul 6:2024.07.03.24309917. doi: 10.1101/2024.07.03.24309917.
PGAP3 is a glycosylphosphatidylinositol (GPI) phospholipase gene localized within chromosome 17q12-21, a region highly linked to asthma. Although much is known about the function of other chromosome 17q12-21 genes expressed at increased levels in bronchial epithelium such as ORMDL3 and GSDMB, little is known about the function of increased PGAP3 expression in bronchial epithelium in the context of asthma. The aim of this study was therefore to determine whether increased PGAP3 expression in human bronchial epithelial cells regulated expression of mRNA pathways important to the pathogenesis of asthma by utilizing RNA-sequencing and bioinformatic analysis. We performed RNA-sequencing on normal human bronchial epithelial cells transfected with PGAP3 for 24 and 48 hours. PGAP3 regulated genes were compared to asthma and respiratory virus (influenza A, rhinovirus, respiratory syncytial virus) reference data sets to identify PGAP3 target genes and pathways. Approximately 9% of the upregulated PGAP3-induced genes were found in an asthma reference data set, 41% in a rhinovirus reference data set, 33% in an influenza A reference data set, and 3% in a respiratory syncytial virus reference data set. PGAP3 significantly upregulated the expression of several genes associated with the innate immune response and viral signatures of respiratory viruses associated with asthma exacerbations. Two of the highest expressed genes induced by PGAP3 are RSAD2, OASL, and IFN-λ, which are anti-viral genes associated with asthma. PGAP3 also upregulated the antiviral gene BST2, which like PGAP3 is a GPI-anchored protein. We conclude that PGAP3 expression in human bronchial epithelial cells regulates expression of genes known to be linked to asthma, and also regulates the bronchial epithelial expression of genes pertinent to the pathogenesis of respiratory viral triggered asthma exacerbations.
PGAP3是一种糖基磷脂酰肌醇(GPI)磷脂酶基因,定位于17号染色体q12 - 21区域,该区域与哮喘高度相关。尽管人们对在支气管上皮中表达水平升高的其他17号染色体q12 - 21基因(如ORMDL3和GSDMB)的功能了解很多,但对于哮喘背景下支气管上皮中PGAP3表达增加的功能却知之甚少。因此,本研究的目的是通过RNA测序和生物信息学分析,确定人支气管上皮细胞中PGAP3表达增加是否调节了对哮喘发病机制重要的mRNA通路的表达。我们对用PGAP3转染24小时和48小时的正常人支气管上皮细胞进行了RNA测序。将PGAP3调控的基因与哮喘和呼吸道病毒(甲型流感病毒、鼻病毒、呼吸道合胞病毒)参考数据集进行比较,以鉴定PGAP3靶基因和通路。在哮喘参考数据集中发现约9%的PGAP3诱导上调基因,在鼻病毒参考数据集中为41%,在甲型流感病毒参考数据集中为33%,在呼吸道合胞病毒参考数据集中为3%。PGAP3显著上调了几个与先天性免疫反应以及与哮喘加重相关的呼吸道病毒的病毒特征相关的基因的表达。PGAP3诱导表达最高的两个基因是RSAD2、OASL和IFN - λ,它们是与哮喘相关的抗病毒基因。PGAP3还上调了抗病毒基因BST2,它与PGAP3一样是一种GPI锚定蛋白。我们得出结论,人支气管上皮细胞中PGAP3的表达调节已知与哮喘相关的基因的表达,并且还调节与呼吸道病毒引发的哮喘加重发病机制相关的基因的支气管上皮表达。