哮喘支气管上皮IgA分泌受损IL-4/IL-13的角色

2018/12/24

   摘要
   背景: 哮喘与肺IgE产生增加有关,但是疾病中分泌型IgA系统是否受到影响仍然未知。
   目的: 我们探讨了人类哮喘粘膜IgA转运及Th2型炎症对其潜在调节作用。
   方法: 测定哮喘和对照受试者的支气管活组织检测获取的支气管上皮多聚免疫球蛋白受体(pIgR)表达,探索其与Th2型生物标志物的相关性。气 - 液界面培养体外重建受试者支气管上皮,检测其pIgR表达和IL-4/IL-13对pIgR表达的调节。
   测量和主要结果: 在哮喘患者支气管上皮中观察到pIgR蛋白下调(与对照受试相比P = 0.0002)。 在哮喘患者的离体培养上皮细胞中未观察到这种上皮缺陷。 外源性IL-13和IL-4可抑制pIgR表达和IgA转胞吞作用。机制实验表明,自分泌转化生长因子-β介导IL-4/IL-13对pIgR的作用,其中部分效应来自于转化生长因子-α/表皮生长因子受体的上调。
   结论: 该研究显示,哮喘支气管上皮pIgR表达受损,可能影响分泌型IgA介导的前线防御,该机制依赖转移生长因子途径的Th2型免疫激活。

 
(张欣1张红萍1 王刚2 四川大学华西医院中西医结合科呼吸病组 610041 摘译)
Am J Respir Crit Care Med Vol 197, Iss 11, pp 1396–1409, Jun 1, 2018
 
 
 
Bronchial Epithelial IgA Secretion Is Impaired in AsthmaRole of IL-4/IL-13

Maha Zohra Ladjemi, Delphine Gras, Se´bastien Dupasquier, Bruno Detry, Marylene Lecocq, Ce´line Garulli, Chantal Fregimilicka, Caroline Bouzin, Sophie Gohy, Pascal Chanez, and Charles Pilette

Am J Respir Crit Care Med Vol 197, Iss 11, pp 1396–1409, Jun 1, 2018

Abstract
Rationale: Asthma is associated with increased lung IgE production, but whether the secretory IgA system is affected in this disease remains unknown.
Objectives: We explored mucosal IgA transport in human asthma and its potential regulation by T-helper cell type 2 inflammation.
Methods: Bronchial biopsies from asthma and control subjects were assayed for bronchial epithelial polymeric immunoglobulin receptor (pIgR) expression and correlated to T-helper cell type 2 biomarkers. Bronchial epithelium reconstituted in vitro from these subjects, on culture in air–liquid interface, was assayed for pIgR expression and regulation by IL-4/IL-13.
Measurements and Main Results: Downregulation of pIgR protein was observed in the bronchial epithelium from patients with asthma (P = 0.0002 vs. control subjects). This epithelial defect was not observed ex vivo in the cultured epithelium from patients with asthma. Exogenous IL-13 and IL-4 could inhibit pIgR expression and IgA transcytosis. Mechanistic experiments showed that autocrine transforming growth factor-b mediates the IL-4/IL-13 effect on the pIgR, with a partial contribution of upregulated transforming growth factor-a/epidermal growth factor receptor.
Conclusion: This study shows impaired bronchial epithelial pIgR expression in asthma, presumably affecting secretory IgA–mediated frontline defense as a result of type 2 immune activation of the transforming growth factor path

 


上一篇: 英国成人哮喘急性发作模式:一项基于人群的研究
下一篇: JAK1/JAK2抑制剂鲁索利替尼可抑制肥大细胞脱颗粒和细胞因子释放

用户登录