Time sequence of airway remodeling in a mouse model of chronic asthma: the relation with airway hyperresponsiveness.
During the course of establishing an animal model of chronic asthma, we tried to elucidate the time sequence of airway hyperresponsiveness (AHR), airway inflammation, airway remodeling, and associated cytokines. Seven-week-old female BALB/c mice were studied as a chronic asthma model using ovalbumin (OVA). After sensitization, mice were exposed twice weekly to aerosolized OVA, and were divided into three groups depending on the duration of 4 weeks, 8 weeks, and 12 weeks. At each time point, airway responsiveness, inflammatory cells, cytokines in bronchoalveolar lavage fluids (BALF), serum OVA-specific IgE, IgG1, IgG2a, and histological examination were carried out. AHR to methacholine, increased levels of OVA-specific IgG1 and IgG2a, and goblet cell hyperplasia were continuously sustained at each time point of weeks. In contrast, we observed a time-dependent decrease in serum OVA-specific IgE, BALF eosinophils, BALF cytokines such as IL-13, transforming growth factor-beta1, and a time-dependent increase in BALF promatrix metalloproteinase-9 and peribronchial fibrosis. In this OVA-induced chronic asthma model, we observed airway remodelings as well as various cytokines and inflammatory cells being involved in different time-dependent manners. However, increased airway fibrosis did not directly correlate with a further increase in airway hyperresponsiveness.
Kim
Seung Joon
SJ
Division of Pulmonology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
Kim
Chi Hong
CH
Ahn
Joong Hyun
JH
Kim
Myung Sook
MS
Kim
Seok Chan
SC
Lee
Sook Young
SY
Kwon
Soon Seog
SS
Kim
Young Kyoon
YK
Kim
Kwan Hyoung
KH
Moon
Hwa Sik
HS
Song
Jeong Sup
JS
Park
Sung Hak
SH
D000818:Animals; D001249:Asthma / Q000139:chemically induced / Q000276:immunology*; D002908:Chronic Disease; D016207:Cytokines / Q000276:immunology*; D004195:Disease Models, Animal; D005260:Female; D008168:Lung / Q000187:drug effects / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D010047:Ovalbumin; D011014:Pneumonia / Q000139:chemically induced / Q000276:immunology*; D013997:Time Factors
D016207:Cytokines; D010047:Ovalbumin