Intrinsic biochemical and functional differences in bronchial epithelial cells of children with asthma

被引:147
作者
Kicic, Anthony [1 ]
Sutanto, Erika N.
Stevens, Paul T.
Knight, Darryl A.
Stick, Stephen M.
机构
[1] Princess Margaret Hosp Children, Dept Resp Med, Perth, WA 6001, Australia
[2] Univ Western Australia, Sch Pediat & Child Hlth, Nedlands, WA 6009, Australia
[3] Telethon Inst Child Hlth Res, Subiaco, WA, Australia
[4] Univ British Columbia, St Pauls Hosp, James Hogg iCAPTURE Ctr Cardiovasc & Pulm Res, Vancouver, BC V5Z 1M9, Canada
[5] Univ British Columbia, Dept Anesthesiol Pharmacol & Therapeut, Vancouver, BC V5Z 1M9, Canada
关键词
airway; asthma; bronchial epithelium; cell; nonbronchoscopic brushing;
D O I
10.1164/rccm.200603-392OC
中图分类号
R4 [临床医学];
学科分类号
1002 ; 100602 ;
摘要
Rationale: Convincing evidence of epithelial damage and aberrant repair exists in adult asthmatic airways, even in the absence of inflammation. However, comparable studies in children have been limited by access and availability of clinical samples. Objectives: To determine whether bronchial epithelial cells from children with asthma are inherently distinct from those obtained from children without asthma. Methods: Epithelial cells were obtained by nonbronchoscopic bronchial brushing of children with mild asthma (n = 7), atopic children without asthma (n = 9), and healthy children (n = 12). Cells were subject to morphologic, biochemical, molecular, and functional assessment. Responses were also compared with commercially available epithelial cultures and the transformed cell line 16HBE140. Results: All epithelial cells exhibited a "cobblestone" morphology, which was maintained throughout culture and repeated passage. Expression of cytokeratin 19 varied, with disease phenotype being greatest in healthy nonatopics and lowest in asthmatics. In contrast, expression of cytokeratin 5/14 was greatest in asthmatic samples and least in healthy nonatopic samples. Asthmatic epithelial cells also spontaneously produced significantly greater amounts of interleukin (IL)-6, prostaglandin E-2, and epidermal growth factor, and equivalent amounts of IL-1 beta and soluble intracellular adhesion molecule-1, but significantly lower amounts of transforming growth factor beta 1. This profile was maintained through successive passages. Asthmatic epithelial cells also exhibited greater rates of proliferation than nonasthmatic cells. Conclusions: This study has shown that epithelial cells from children with mild asthma are intrinsically different both biochemically and functionally compared with epithelial cells from children without asthma. Importantly, these differences are maintained over successive passages, suggesting that they are not dependent on an in vivo environment.
引用
收藏
页码:1110 / 1118
页数:9
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