INDUCTION, DURATION, AND RESOLUTION OF AIRWAY GOBLET CELL HYPERPLASIAIN A MURINE MODEL OF ATOPIC ASTHMA - EFFECT OF CONCURRENT INFECTION WITH RESPIRATORY SYNCYTIAL VIRUS AND RESPONSE TO DEXAMETHASONE
Di. Blyth et al., INDUCTION, DURATION, AND RESOLUTION OF AIRWAY GOBLET CELL HYPERPLASIAIN A MURINE MODEL OF ATOPIC ASTHMA - EFFECT OF CONCURRENT INFECTION WITH RESPIRATORY SYNCYTIAL VIRUS AND RESPONSE TO DEXAMETHASONE, American journal of respiratory cell and molecular biology, 19(1), 1998, pp. 38-54
We recently described a murine model of atopic asthma in which a marke
d, extensive hyperplasia of airway goblet cells is induced by repeated
challenge of ovalbumin (OA)-sensitized mice with intratracheally admi
nistered allergen (Am. J. Respir. Cell Mol. Biol. 1996;14:425-438). We
report here the time course of the duration of this feature and of it
s spontaneous resolution in the absence of further allergen exposure.
Induction of severe neutrophilic inflammation in the airways by repeat
ed intratracheal administration of lipopolysaccharide failed to induce
goblet cell hyperplasia (GCH) to as great a degree as that induced by
allergen, suggesting that nonallergic inflammation is a relatively po
or inducer of this phenotype change in mice. When a ''subclinical'' in
fection of the lungs with the human A2 strain of respiratory syncytial
virus was superimposed on the model of atopic asthma, recruitment of
monocytes and lymphocytes to the airways was enhanced and a discharge
of goblet cell mucin contents was observed. This may partly explain th
e respiratory difficulty that typifies virally induced exacerbations o
f asthma in humans. Daily systemic treatment of sensitized mice with d
examethasone during the period of allergen challenge produced a dose-r
elated suppression of developing GCH, while similar treatment during t
he period following the establishment of extensive hyperplasia induced
an accelerated resolution toward a normal epithelial phenotype. These
results confirm and extend the relevance of this model as a represent
ation of the human disease.