Eoxins: A new inflammatory pathway in childhood asthma

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• 作者：Christine Sachs-Olsen ; Marek Sanak ; Astri Maria Lang ; Anna Gielicz ; Petter Mowinckel ; Karin Cecilie L&#xf8 ; drup Carlsen ; Kai-Hå ; kon Carlsen ; Andrzej Szczeklik
• 关键词：Exhaled breath condensate ; leukotrienes ; 15-hydroxyeicosatetraenoic acid ; eoxins ; asthma ; child
• 刊名：Journal of Allergy and Clinical Immunology
• 出版年：2010
• 出版时间：October 2010
• 年：2010
• 卷：126
• 期：4
• 页码：859-867.e9
• 全文大小：1128 K

文摘

Background

Increased levels of leukotrienes (LTs) in exhaled breath condensate (EBC) are associated with asthma and bronchial hyperresponsiveness (BHR), whereas eicosanoids generated through the 15-lipoxygenase (LO) pathway (15-hydroxyeicosatetraenoic acid [HETE] and eoxins) have been less studied.

Objective

We investigated whether metabolites of the 5- and 15-LO pathways in EBC are associated with childhood asthma, asthma severity, and clinical parameters.

Methods

The present study included 131 school-aged children (27 children with problematic severe asthma, 80 children with mild-to-moderate asthma, and 24 healthy children) from the Severe Asthma Recognized in Childhood study and 19 children with other nonasthmatic chronic lung diseases. Clinical work-up included spirometry, fractional exhaled nitric oxide measurements, skin prick testing, and methacholine challenge. Eicosanoids were analyzed in EBC by using mass spectrometry and are reported as concentrations (in picograms per milliliter) and eicosanoid/palmitic acid (PA) ratios.

Results

Eoxin C₄/PA, eoxin D₄/PA, eoxin E₄/PA, 15-HETE/PA, and LTC₄/PA ratios were significantly increased in asthmatic versus healthy children. Eoxin D₄/PA and LTE₄/PA ratios were also significantly higher in children with BHR. A nonsignificant trend was observed toward higher eoxin/PA ratios with increasing asthma severity. In contrast to asthma, children with chronic lung disease had the highest 15-HETE/PA, LTC₄/PA, LTE₄/PA, and LTB₄/PA ratios.

Conclusion

The results point to increased activity of the 15-LO inflammatory pathway in childhood asthma. Mass spectrometric analyses of EBC demonstrate that increased eoxin levels not only accompany the increased 5-LO product LTC₄ but are also associated with BHR. These markers might represent a new therapeutic target for asthma treatment.