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2017 ; 6
(ä): 143-158
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Non-clinical Safety and Efficacy of an AAV2/8 Vector Administered Intravenously
for Treatment of Mucopolysaccharidosis Type VI
#MMPMID28932756
Ferla R
; Alliegro M
; Marteau JB
; Dell'Anno M
; Nusco E
; Pouillot S
; Galimberti S
; Valsecchi MG
; Zuliani V
; Auricchio A
Mol Ther Methods Clin Dev
2017[Sep]; 6
(ä): 143-158
PMID28932756
show ga
In vivo gene therapy with adeno-associated viral (AAV) vectors is safe and
effective in humans. We recently demonstrated that AAV8-mediated liver gene
transfer is effective in animal models of mucopolysaccharidosis type VI (MPS VI),
a rare lysosomal storage disease that is caused by arylsulfatase B (ARSB)
deficiency. In preparing for a first-in-human trial, we performed non-clinical
studies to assess the safety of intravenous administrations of AAV2/8.TBG.hARSB
produced under good manufacturing practice-like conditions. No toxicity was
observed in AAV-treated mice, except for a transient increase in alanine
aminotransferase in females and thyroid epithelial hypertrophy. AAV2/8.TBG.hARSB
biodistribution and expression confirmed the liver as the main site of both
infection and transduction. Shedding and breeding studies suggest that the risk
of both horizontal and germline transmission is minimal. An AAV dose-response
study in MPS VI mice was performed to define the range of doses to be used in the
clinical study. Overall, these data support the non-clinical safety and efficacy
of AAV2/8.TBG.hARSB and pave the way for a phase I/II clinical trial based on
intravascular infusions of AAV8 in patients with MPS VI.