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  • Title: Long-term correction of ammonia metabolism and prolonged survival in ornithine transcarbamylase-deficient mice following liver-directed treatment with adeno-associated viral vectors.
    Author: Moscioni D, Morizono H, McCarter RJ, Stern A, Cabrera-Luque J, Hoang A, Sanmiguel J, Wu D, Bell P, Gao GP, Raper SE, Wilson JM, Batshaw ML.
    Journal: Mol Ther; 2006 Jul; 14(1):25-33. PubMed ID: 16677864.
    Abstract:
    The purpose of this study was to determine the efficacy of novel recombinant adeno-associated viral (AAV) vector constructs in correcting metabolic defects in the liver in two strains of ornithine transcarbamylase (OTC)-deficient mice (spf and spf-ash). AAV vectors expressing mouse OTC were produced with capsids from AAV2 and the novel serotypes AAV7, 8, and 9. OTC-deficient mice were infused with these vectors as well as a control AAV2/8 vector expressing LacZ. In vivo activity of OTC was assessed by measuring a surrogate marker, urine orotate. The novel vectors restored orotate levels to virtually normal 15 days after infusion, and each persisted to 1 year posttreatment. Liver OTC enzyme activity in spf mice was substantially higher in animals receiving novel vectors compared to those receiving AAV2 vectors. Animals receiving novel OTC-expressing vectors lived longer than those treated with AAV2 OTC or untreated controls, and they were tolerant to a challenge with NH3 at 21 days and beyond, which caused severe morbidity in control OTC-deficient animals. Numerous mice, representative of all treatment groups followed for +250 days, were observed to have either nodules or discrete tumors in the liver, the etiology of which is the subject of a companion paper.
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