Michael Stephanie, Liotta Nicholas, Fei Tongyi, Bendall Matthew L, Nixon Douglas F, Dopkins Nicholas
Division of Infectious Diseases, Department of Medicine, Weill Cornell Medicine, New York, NY, USA.
Division of Infectious Diseases, Department of Medicine, Weill Cornell Medicine, New York, NY, USA.
Microbes Infect. 2024 Dec 15:105465. doi: 10.1016/j.micinf.2024.105465.
Cystic fibrosis (CF) is an autosomal recessive genetic disorder characterized by impairment of the CF transmembrane conductance regulator (CFTR) via gene mutation. CFTR is expressed at the cellular membrane of epithelial cells and functions as an anion pump which maintains water and salt ion homeostasis. In pulmonary airways of CF patients, pathogens such as P. aeruginosa and subsequent uncontrolled inflammation damage the human airway epithelial cells (HAECs) and can be life-threatening. We previously identified that inhibiting endogenous retroelement (ERE) reverse transcriptase can hamper the inflammatory response to bacterial flagella in THP-1 cells. Here, we investigate how ERE expression is sensitive to HAEC repair and toll-like receptor 5 (TLR5) activation, a primary mechanism by which inflammation impacts disease outcome. Our results demonstrate that several human endogenous retroviruses (HERVs) and long interspersed nuclear elements (LINEs) fluctuate throughout the various stages of repair and that TLR5 activation further influences ERE expression. By considering the impact of the most common CF mutation F508del/F508del on ERE expression in unwounded HAECs, we also found that two specific EREs, L1FLnI_2p23.1c and HERVH_10p12.33, were downregulated in CF-derived HAECs. Collectively, we show that ERE expression in HAECs is sensitive to certain modalities reflective of CF pathogenesis, and specific EREs may be indicative of CF disease state and pathogenesis.
囊性纤维化(CF)是一种常染色体隐性遗传疾病,其特征是通过基因突变导致囊性纤维化跨膜传导调节因子(CFTR)功能受损。CFTR表达于上皮细胞膜,作为一种阴离子泵维持水和盐离子的稳态。在CF患者的气道中,铜绿假单胞菌等病原体以及随后不受控制的炎症会损害人气道上皮细胞(HAECs),并可能危及生命。我们之前发现,抑制内源性逆转录元件(ERE)逆转录酶可阻碍THP-1细胞中对细菌鞭毛的炎症反应。在此,我们研究ERE表达如何对HAEC修复和Toll样受体5(TLR5)激活敏感,这是炎症影响疾病结局的主要机制。我们的结果表明,几种人类内源性逆转录病毒(HERVs)和长散在核元件(LINEs)在修复的各个阶段都会波动,并且TLR5激活会进一步影响ERE表达。通过考虑最常见的CF突变F508del/F508del对未受伤HAECs中ERE表达的影响,我们还发现两个特定的ERE,L1FLnI_2p23.1c和HERVH_10p12.33,在CF来源的HAECs中表达下调。总的来说,我们表明HAECs中的ERE表达对反映CF发病机制的某些模式敏感,并且特定的ERE可能指示CF疾病状态和发病机制。