Local administration of antisense phosphorothioate oligonucleotides to thec-kit ligand, stem cell factor, suppresses airway inflammation and IL-4 production in a murine model of asthma
S. Finotto et al., Local administration of antisense phosphorothioate oligonucleotides to thec-kit ligand, stem cell factor, suppresses airway inflammation and IL-4 production in a murine model of asthma, J ALLERG CL, 107(2), 2001, pp. 279-286
Background: The c-kit ligand, stem cell factor (SCF), is an important activ
ating and chemotactic factor for both mast cells and eosinophils, These cel
ls are known to play a fundamental role in the pathogenesis of asthma.
Objective: Our goal was to analyze the functional role of SCF in the pathog
enesis of asthma.
Methods: The expression of SCF was targeted in fibroblasts, epithelial cell
s, and locally in a murine model of asthma in mice induced by ovalbumin sen
sitization with an antisense DNA strategy.
Results: We could suppress SCF expression in NIH 3T3 fibroblasts and SP1 ep
ithelial cells by a specific antisense phosphorothioate oligonucleotide ove
rlapping the translation start site of SCF, whereas control oligonucleotide
s were virtually inactive. We then focused on the role of SCF in a murine m
odel of asthma associated with late-phase allergic inflammation in ovalbumi
n-sensitized mice: Local intranasal administration of FITC-labeled SCF anti
sense oligonucleotides led to strong DNA uptake in interstitial lung cells
associated with a striking reduction of intracellular SCF expression. Such
intrapulmonary blockade of SCF expression after repeated allergen challenge
s suppressed various signs of lung inflammation including IL-4 production a
nd infiltration of eosinophils. SCF antisense DNA treatment was at least as
effective as corticosteroid treatment.
Conclusion: These data indicate a critical role for SCP in a murine asthma
model and suggest that local delivery of SCF antisense oligonucleotides may
be a novel approach for the treatment of inflammatory lung disorders such
as asthma.