Hemophilia A and B are hereditary coagulation defects resulting from a deficiency
of factor VIII (FVIII) and factor IX (FIX), respectively. Introducing a functional
FVIII or FIX gene could potentially provide a cure for these bleeding disorders. Adenoviral vectors
have been used as tools to introduce potentially therapeutic genes into mammalian
cells and are by far the most efficient vectors for hepatic gene delivery. Long-term
expression of both FVIII and FIX has been achieved in preclinical (hemophilic) mouse
models using adenoviral vectors. Therapeutic levels of FVIII and FIX also have been
achieved in hemophilic dogs using adenoviral vectors and in some cases expression
was long-term. The performance of earlier generation adenoviral vectors, which retained
residual viral genes, was compromised by potent acute and chronic inflammatory responses
that contributed to significant toxicity and morbidity and short-term expression of
FVIII and FIX. The development of improved adenoviral vectors devoid of viral genes
(gutless or high-capacity adenoviral vectors) was therefore warranted, which led to
a significant reduction in acute and chronic toxicity and more prolonged expression
of FVIII and FIX. Strategies aimed at making these vectors safer and less immunogenic
and their implications for hemophilia gene therapy are discussed in this review.
KEYWORDS
Hemophilia A - hemophilia B - gene therapy - adenoviral vector
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Marinee K L ChuahPh.D.
Center for Transgene Technology and Gene Therapy, University of Leuven, Flanders Interuniversity
Institute for Biotechnology (VIB), University Hospital Gasthuisberg
Herestraat 49, B-3000 Leuven, Belgium
Email: marinee.chuah@med.kuleuven.ac.be