마이코플라즈마 폐렴 환아에서혈청 Endothelin-1 상승의 의의
Increased Serum Endothelin(ET)-1 in Children withMycoplasma pneumoniae Pneumonia
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목 적 : 급성 폐렴으로 인해 소아과에 입원 치료하였던 3세부터 13세까지의 소아 환자 53명을 대상으로 하여 제 1군은 M. pneumoniae에 의한 감염으로 진단되었고 입원 중 천명 증상을 동반하였던 23명, 제 2군은 M. pneumoniae에 의한 감염으로 진단되었고 천명 증상을 동반하지 않았던 19명, 제 3군은 M. pneumoniae 감염이 아닌 다른 원인에 의한 폐렴 환자군 11명, 대조군으로 M. pneumoniae 감염의 증거가 없고 호흡기 증상을 가지지 않은 동일 연령대의 10명으로 나누어 조사하였다.방 법 : 입원 당시 혈청내 M. pneumoniae 항원에 대한 IgG 특이 항체의 역가가 1 : 320 이상이거나 재검사상 4배 이상의 역가 상승을 보인 경우이면서 동시에 IgM 항체가 양성 반응을 나타낸 경우에 M. pneumoniae에 의한 급성 감염으로 진단하였으며 위 항체 반응에 모두 음성을 나타낸 경우에 M. pneumoniae에 의한 감염이 아닌 것으로 판정하였으며 제 1, 2, 3군과 대조군에서 혈청 ET-1, IL-18, IL-5, 총 IgE 치를 측정하여 비교 분석하였다.결 과: 1) 폐렴 환자군 세 군간에 평균 연령, 남여 비 등은 차이가 없었다. 2) 혈청 ET-1은 M. pneumoniae 폐렴 환자군에서 제 3군 및 대조군에 비해 유의하게 높은 측정치를 나타내었다.(P<0.01) 또한 제 1군과 제 2군간의 비교에서는 천명을 동반하였던 제 1군에서 천명을 동반하지 않았던 제 2군에 비해 유의하게 높은 측정치를 나타내었다.(P<0.05) 3)혈청 IL-5는 M. pneumoniae 폐렴 환자군에서 제 3군에 비해 높은 경향을 보였으나 통계적으로 유의한 정도는 아니었으며(P=0.09) 대조군에 비해서는 유의하게 높았다.(P<0.01) 4)혈청 IL-18은 M. pneumoniae 폐렴 환자군과 제 3군간에 유의한 차이를 나타내지 않았으며 대조군에 비해서는 유의하게 높았다.(P< 0.01) 5)혈청 총 IgE 치는 제 1군에서 제 2군에 비해 유의하게 높은 측정치를 나타내었으며(P< 0.01) 제 1군에서 혈청 log IgE 치는 혈청 ET- 1 측정치와 유의한 상관관계를 나타내었다.(r= 0.88, P<0.01)결 론:M. pneumoniae 감염에 의한 폐렴에서 혈청 ET-1의 증가가 관찰되었으며 천명을 동반하였던 경우에서 그렇지 않았던 경우에 비해 유의하게 높은 양상을 보였다. 이는 M. pneumoniae 폐렴 이후에 관찰되는 반복적인 천명 증상과 천식 증상이 악화되는 기전에서 ET- 1의 역할을 시사하는 것으로 생각된다.
Abstract
Purpose : Mycoplasma pneumoniae frequently causes lower respiratory illnesses in children, and is known to be associated with acute wheezing and the exacerbation of asthma. However, the mechanism by which this pathogen contributes to the development of wheeze- related symptoms is not fully understood. Previous studies have shown that ET-1 is a potent bronchoconstrictor and implicated in the pathogenesis of bronchial asthma. The aim of our study was to examine the serum ET-1 and other cytokines in M. pneumoniae pneumonia and investigate if there is any difference in relation to the presence of wheezing. Methods : Patients admitted with pneumonia were divided into three groups : M. pneumoniae pneumonia with wheeze(group 1) and without wheeze(group 2), and patients with pneumonia due to other pathogens(group 3). The serum levels of ET-1, IL-18, IL-5 were measured by ELISA in patient groups and controls. Results : Serum ET-1 increased significantly in the patients with M. pneumoniae pneumonia(groups 1 and 2) compared with group 3 and controls. ET-1 in group 1 was significantly higher than in group 2. IL-5 and IL-18 were higher in patient groups than in controls with no difference between groups. Serum total IgE was significantly higher in group 1 than in group 2. A positive correlation was observed between serum ET-1 and total IgE. Conclusion : Our results suggest that ET-1 may be implicated in the pathogenesis of bronchoconstriction and allergic inflammation in the airways of the patients with M. pneumoniae pneumonia.
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