Cutting edge: modulation of airway inflammation by CpG oligodeoxynucleotides in a murine model of asthma

JN Kline, TJ Waldschmidt, TR Businga… - The Journal of …, 1998 - journals.aai.org
JN Kline, TJ Waldschmidt, TR Businga, JE Lemish, JV Weinstock, PS Thorne, AM Krieg
The Journal of Immunology, 1998journals.aai.org
Asthma has been increasing in industrialized countries. Evidence suggests that asthma is
caused by a Th2 immune response to inhaled environmental Ags and that childhood
infections protect against this. We have shown that bacterial DNA contains motifs, centered
on unmethylated CpG dinucleotides, which induce Th1-type responses. We hypothesized
that the Th1 effect of these CpG motifs may oppose the Th2 type allergic response and
suggest that this may account for the protective effect of childhood infection against asthma …
Abstract
Asthma has been increasing in industrialized countries. Evidence suggests that asthma is caused by a Th2 immune response to inhaled environmental Ags and that childhood infections protect against this. We have shown that bacterial DNA contains motifs, centered on unmethylated CpG dinucleotides, which induce Th1-type responses. We hypothesized that the Th1 effect of these CpG motifs may oppose the Th2 type allergic response and suggest that this may account for the protective effect of childhood infection against asthma. We examined the effects of CpG-motif oligodeoxynucleotides (CpG ODN) in a murine model of asthma. Airway eosinophilia, Th2 cytokine induction, IgE production, and bronchial hyperreactivity were prevented by coadministration of CpG ODN with the Ag. Significantly, in a previously sensitized mouse, CpG ODN can prevent allergen-induced airway inflammation. These studies suggest that exposure to CpG DNA may protect against asthma.
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