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Receptor Signaling and IL-10 Gene Therapy Regulate the Innate and Humoral Immune Responses to Recombinant Adenovirus in the Lung1





Departments of
*
Surgery and
Molecular Genetics and Microbiology, University of Florida College of Medicine, Gainesville, FL 32610; and
Canji, San Diego, CA 92121
Recombinant adenovirus-mediated gene therapy has demonstrated great
promise for the delivery of genes to the pulmonary epithelium. However,
dose-dependent inflammation and local immune responses abbreviate
transgene expression. The purpose of these studies was to determine the
role of TNF-
and individual TNF receptor signaling to adenovirus
clearance and immune responses, and whether coexpression of human IL-10
could reduce inflammation and extend the duration of transgene
expression in the lung. ß-Galactosidase expression in mice receiving
intratracheal instillation of Adv/ß-gal (adenovirus construct
expressing ß-galactosidase) was transient (less than 14 days), but a
significant early increase of ß-galactosidase expression was seen in
mice lacking either or both TNF-
receptors. Absence of TNF-
or
the p55 receptor significantly attenuated the Ab response to both
adenovirus and ß-galactosidase. Human IL-10 expression in the lung
suppressed local TNF-
production following AdV/hIL-10 (adenovirus
construct expressing human IL-10) delivery, but did not lead to
increased or prolonged transgene expression when coexpressed with
ß-galactosidase. Expression of human IL-10 following AdV/hIL-10
instillation extended at least 14 days, was nonimmunogenic, and
suppressed the development of neutralizing Abs against adenoviral
proteins as well as against human IL-10. We conclude that TNF-
signaling through both the p55 and p75 receptor plays important roles
in the clearance of adenoviral vectors and the magnitude of the humoral
immune response. Additionally, although coexpression of human IL-10
with ß-galactosidase had only modest effects on transgene expression,
we demonstrate that AdV/hIL-10 is well tolerated, has extended
expression compared with ß-galactosidase, and is nonimmunogenic in
the lung.
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