University of Massachusetts Medical School Faculty Publications

Title

Safe and effective superoxide dismutase 1 silencing using artificial microRNA in macaques

UMMS Affiliation

Horae Gene Therapy Center; Department of Neurology; Department of Pediatrics

Publication Date

2018-10-31

Document Type

Article

Disciplines

Genetics and Genomics | Nervous System Diseases | Neuroscience and Neurobiology | Therapeutics | Translational Medical Research

Abstract

Amyotrophic lateral sclerosis (ALS) is a fatal neurological disease caused by degeneration of motor neurons leading to rapidly progressive paralysis. About 10% of cases are caused by gain-of-function mutations that are transmitted as dominant traits. A potential therapy for these cases is to suppress the expression of the mutant gene. Here, we investigated silencing of SOD1, a gene commonly mutated in familial ALS, using an adeno-associated virus (AAV) encoding an artificial microRNA (miRNA) that targeted SOD1 In a superoxide dismutase 1 (SOD1)-mediated mouse model of ALS, we have previously demonstrated that SOD1 silencing delayed disease onset, increased survival time, and reduced muscle loss and motor and respiratory impairments. Here, we describe the preclinical characterization of this approach in cynomolgus macaques (Macaca fascicularis) using an AAV serotype for delivery that has been shown to be safe in clinical trials. We optimized AAV delivery to the spinal cord by preimplantation of a catheter and placement of the subject with head down at 30° during intrathecal infusion. We compared different promoters for the expression of artificial miRNAs directed against mutant SOD1 Results demonstrated efficient delivery and effective silencing of the SOD1 gene in motor neurons. These results support the notion that gene therapy with an artificial miRNA targeting SOD1 is safe and merits further development for the treatment of mutant SOD1-linked ALS.

Keywords

Amyotrophic lateral sclerosis, ALS, gene silencing, SOD1, adeno-associated virus, AAV, microRNA, miRNA

DOI of Published Version

10.1126/scitranslmed.aau6414

Source

Sci Transl Med. 2018 Oct 31;10(465). pii: eaau6414. doi: 10.1126/scitranslmed.aau6414.

Related Resources

Link to article in PubMed

Journal/Book/Conference Title

Science Translational Medicine

PubMed ID

30381409

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