title: Biodistribution of rAAV vectors following intraocular administration: evidence for the presence and persistence of vector DNA in the optic nerve and in the brain.
abstract: The purpose of our study was to evaluate the biodistribution of rAAV vectors following subretinal or intravitreal injection. In rats, we performed subretinal or intravitreal injections of rAAV-2/2.CMV.gfp. In large animals, rAAV-2/4.CMV.gfp or rAAV-2/5.CMV.gfp was delivered into the subretinal space while rAAV-2/2.CMV.gfp was delivered either to the subretinal space or to the vitreous. In euthanized animals, we undertook a complete necropsy. In animals maintained alive, we collected blood and tissue samples from the submandibular lymph node, liver, and gonads. We analyzed total DNA, extracted from various tissue samples and peripheral blood mononuclear cells (PBMC), by PCR. Following subretinal or intravitreal injections in rats and in large animals, vector sequences were not detected in the liver or in the gonads but were occasionally found in PBMC. An unexpected result was the detection of rAAV sequences in the optic nerve following subretinal injection. The most striking finding was the detection of vector sequences in the brain, along the visual pathway, in rAAV-2/2 intravitreally injected dogs. These findings raise safety concerns regarding intraocular administration of rAAV vectors and will have an impact on the development of future gene therapy trials for retinal diseases.
authors.affiliation: INSERM UMR U649, CHU-Hotel DIEU, Bâtiment J. Monnet, 30 Avenue J. Monnet, 44035 Nantes Cedex 01, France.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Provost
authors.forename: Guylène
authors.initials: G
authors.lastname: Le Meur
authors.forename: Michel
authors.initials: M
authors.lastname: Weber
authors.forename: Alexandra
authors.initials: A
authors.lastname: Mendes-Madeira
authors.forename: Guillaume
authors.initials: G
authors.lastname: Podevin
authors.forename: Yan
authors.initials: Y
authors.lastname: Cherel
authors.forename: Marie-Anne
authors.initials: MA
authors.lastname: Colle
authors.forename: Jack-Yves
authors.initials: JY
authors.lastname: Deschamps
authors.forename: Philippe
authors.initials: P
authors.lastname: Moullier
authors.forename: Fabienne
authors.initials: F
authors.lastname: Rolling
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism*; D004247:DNA / Q000008:administration & dosage* / Q000009:adverse effects / Q000235:genetics / Q000493:pharmacokinetics*; D000229:Dependovirus / Q000235:genetics*; D004285:Dogs; D005123:Eye / Q000294:innervation / Q000378:metabolism*; D005822:Genetic Vectors / Q000008:administration & dosage / Q000009:adverse effects / Q000235:genetics / Q000493:pharmacokinetics*; D007275:Injections, Intravenous; D008164:Luminescent Proteins; D008251:Macaca; D009900:Optic Nerve / Q000378:metabolism*; D051381:Rats; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D013997:Time Factors; D014018:Tissue Distribution
chemical_list: D008164:Luminescent Proteins; D011994:Recombinant Proteins; D004247:DNA