Abstract:
:The present study sought to determine the impact of the route of administration of an adeno-associated virus (AAV) vector encoding human factor IX (hFIX) on the induction of an immune response against the vector and its xenogenic transgene product, hFIX. Increasing doses of AAV-hFIX were administered by different routes to C57Bl/6 mice, which typically demonstrate significant immune tolerance to hFIX. The route of delivery had a profound impact on serum hFIX levels as well as the induction of an anti-hFIX humoral immune response. At all dose levels tested, delivery of AAV-hFIX by an intramuscular (IM) route induced an antibody response against the human FIX protein and no hFIX was detected in the serum of animals even at doses of 2 x 10(11) DNA viral particles (vp) of AAV-hFIX. This was in stark contrast to the mice that received AAV-hFIX by intraportal vein (IPV) administration. No anti-hFIX inhibitors were observed in any of these mice and therapeutic levels of hFIX were detected in the serum of all mice that received doses of 2 x 10(10) vp AAV-hFIX and higher. When pre-existing neutralizing immunity to AAV was established in mice, AAV-hFIX administration by either the IM or IPV routes did not result in detectable serum hFIX. Although hFIX expression was not observed in mice with pre-existing neutralizing immunity to AAV, an anti-hFIX response was induced in all of the animals that received AAV-hFIX by the IM route. This was not observed in the preimmune mice that received AAV-hFIX by IPV administration. These results suggest that the threshold of inducing an immune response against a secreted transgene product, in this case the xenoprotein hFIX, is lower when the vector is administered by the IM route even in animals with pre-existing immunity to AAV. (Blood. 2001;97:3733-3737)
journal_name
Bloodjournal_title
Bloodauthors
Ge Y,Powell S,Van Roey M,McArthur JGdoi
10.1182/blood.v97.12.3733subject
Has Abstractpub_date
2001-06-15 00:00:00pages
3733-7issue
12eissn
0006-4971issn
1528-0020journal_volume
97pub_type
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