영유아천식 악화시 Eosinophil-derived Neurotoxin 및 Eosinophil Cationic Protein 농도와 기도벽 비후 사이의 연관성
Eosinophil-derived Neurotoxin and Eosinophil Cationic Protein Levels Correlate with Bronchial Wall Thickness in Children with Asthma Exacerbation
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목 적 : 천식의 병태생리에 있어서 만성 호산구성 염증반응의 역할은 중요하고, 이를 평가하는데 성인천식에서는 HRCT를 이용하였다. 저자들은 영유아 천식에서 호산구의 탈과립과 HRCT 상 이상소견 사이에 연관성을 보이는지를 조사하였다. 방 법 : 급성 천식 발작을 보인 영유아 25명에서 HRCT를 시행하여 기도벽 비후(BWT)와 폐음영 감소(LLD), 기관지의 확장(BD)을 정상아 14명과 비교하였다. 혈청 EDN과 ECP 농도를 측정하여 HRCT 소견과의 상관성을 분석하였다. 결 과 : 영유아천식 환아들에서 정상아들에 비해 기도벽 비후(P<0.001)와 폐음영 감소(P<0.01) 가 의미있게 증가되어 나타났다. 또한 혈청 EDN (r=0.405, P<0.05), ECP (r=0.565, P<0.01) 농도와 기도벽 비후 점수가 영유아천식 환아들에서 의미있는 상관성을 보였고, 폐음영 감소와 기관지의 확장은 관련이 없었다. 혈청 EDN과 ECP 농도는 각각 말초혈액내 총 호산구 수와 의미있는 상관성을 보였다. 결 론 : 천식환아들에서 호산구에서 분비된 혈청 EDN과 ECP 농도는 HRCT 상 기도벽 비후와 상관성을 보였다. 따라서 혈청 EDN 및 ECP농도가 소아천식, 특히 영유아기 천식의 기도벽 비후를 평가하는 가치있는 표지자가 될 수 있겠다.
Abstract
Purpose : Eosinophilic inflammation plays a critical role in asthma and high-resolution computed tomography (HRCT) scoring systems have been used to evaluate the extent and severity in long standing adult asthma. We investigated if there is a correlation between eosinophil degranulation markers and HRCT scores in childhood asthma. Methods : Children with acute asthma exacerbation (n=25) underwent HRCT and were assessed for bronchial wall thickening (BWT), low lung density (LLD), and bronchial dilatation (BD) using semi-quantitative scoring techniques. Serum eosinophil-derived neurotoxin (EDN) and eosinophil cationic protein (ECP) levels indicating eosinophil degranulation were determined. Comparisons were made with normal control subjects (n=14). Results : BWT (P<0.001) and LLD (P<0.001) scores were higher in the childhood asthma group than in the control group, but BD scores were not. The EDN (r=0.405, P<0.05) and ECP (r=0.565, P<0.01) levels significantly correlated with BWT scores, but not with LLD and BD in the childhood asthma group. The EDN (r=0.710, P<0.0001) and the ECP (r=0.580, P<0.0001) levels were significantly correlated with serum total eosinophil counts. Conclusion : The EDN and ECP levels were correlated with BWT scores on HRCT. These findings suggest that EDN and ECP may be valuable for quantifying airway thickening in children with asthma exacerbation.
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