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in vitro
and in vivo
Departments of 1 Pediatrics, 2 Medicine, and 6 Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas 77030; 3 Children's Research Institute, Columbus, Ohio 43205; 4 Department of Pediatrics, Ajou University, Suwon, Korea; and 5 Department of Developmental Neurobiology, St. Jude Children's Research Hospital, Memphis, Tennessee 38101
Interferon
(IFN-
), a potent
cytokine inducing a wide range of immunologic activities, is increased
in the airway secondary to viral infection or during an inflammatory
response. This increase in IFN-
concentration may alter the
expression of specific airway epithelial cell genes that regulate
adaptation of airway inflammatory responses. One protein induced by
IFN-
is Clara cell secretory protein (CCSP), which may contribute to
the attenuation of airway inflammation. This study was done to
investigate the molecular mechanism by which IFN-
stimulates the
expression of the CCSP gene in mouse transformed Clara cells and
transgenic mice. Deletion mapping and linker-scanning mutations
demonstrated that IFN-
-induced expression of CCSP was regulated, in
part, at the level of transcription. In vitro and in vivo studies
verified that the minimal IFN-
-responsive segment was localized to
the proximal 166 bp of the 5'-flanking region. Additionally,
IFN-
-induced expression of CCSP was mediated indirectly through an
interferon regulatory factor-1-mediated increase in hepatocyte nuclear
factor-3
.
hepatocyte nuclear factor-3; CCAAT/enhancer-binding protein; mouse transformed Clara cells; thyroid transcription factor-1; interferon regulatory factor-1; Clara cell secretory protein
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