Neonatal helper-dependent adenoviral vector gene therapy mediates correction of hemophilia A and tolerance to human factor VIII.
Neonatal gene therapy is a promising strategy for treating a number of congenital diseases diagnosed shortly after birth as expression of therapeutic proteins during postnatal life may limit the pathologic consequences and result in a potential "cure." Hemophilia A is often complicated by the development of antibodies to recombinant protein resulting in treatment failure. Neonatal administration of vectors may avoid inhibitory antibody formation to factor VIII (FVIII) by taking advantage of immune immaturity. A helper-dependent adenoviral vector expressing human factor VIII was administered i.v. to neonatal hemophilia A knockout mice. Three days later, mice produced high levels of FVIII. Levels declined rapidly with animal growth to 5 wk of age with stable factor VIII expression thereafter to >1 y of age. Decline in factor VIII expression was not related to cell-mediated or humoral responses with lack of development of antibodies to capsid or human factor VIII proteins. Subsequent readministration and augmentation of expression was possible as operational tolerance was established to factor VIII without development of inhibitors; however, protective immunity to adenovirus remained.
Department of Surgery, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA.
Chuhong
C
Hu
Racel G
RG
Cela
Masataka
M
Suzuki
Brendan
B
Lee
Gerald S
GS
Lipshutz
D000256:Adenoviridae / Q000235:genetics*; D000818:Animals; D004361:Drug Tolerance; D005169:Factor VIII / Q000494:pharmacology*; D015316:Genetic Therapy; D005822:Genetic Vectors; D006467:Hemophilia A / Q000628:therapy*; D006801:Humans; D007231:Infant, Newborn; D051379:Mice; D018345:Mice, Knockout
D005169:Factor VIII
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