Oxidative stress in SEPN1-related myopathy: from pathophysiology to treatment.

Abstract:

OBJECTIVE:Mutations of the selenoprotein N gene (SEPN1) cause SEPN1-related myopathy (SEPN1-RM), a novel early-onset muscle disorder formerly divided into four different nosological categories. Selenoprotein N (SelN) is the only selenoprotein involved in a genetic disease; its function being unknown, no treatment is available for this potentially lethal disorder. Our objective was to clarify the role of SelN and the pathophysiology of SEPN1-RM to identify therapeutic targets. METHODS:We established and analyzed an ex vivo model of SelN deficiency using fibroblast and myoblast primary cultures from patients with null SEPN1 mutations. DCFH assay, OxyBlot, Western blot, Fura-2, and cell survival studies were performed to measure intracellular oxidant activity, oxidative stress markers, calcium handling, and response to exogenous treatments. RESULTS:SelN-depleted cells showed oxidative/nitrosative stress manifested by increased intracellular oxidant activity (reactive oxygen species and nitric oxide) and/or excessive oxidation of proteins, including the contractile proteins actin and myosin heavy chain II in myotubes. SelN-devoid myotubes showed also Ca(2+) homeostasis abnormalities suggesting dysfunction of the redox-sensor Ca(2+) channel ryanodine receptor type 1. Furthermore, absence of SelN was associated with abnormal susceptibility to H(2)O(2)-induced oxidative stress, demonstrated by increased cell death. This cell phenotype was restored by pretreatment with the antioxidant N-acetylcysteine. INTERPRETATION:SelN plays a key role in redox homeostasis and human cell protection against oxidative stress. Oxidative/nitrosative stress is a primary pathogenic mechanism in SEPN1-RM, which can be effectively targeted ex vivo by antioxidants. These findings pave the way to SEPN1-RM treatment, which would represent a first specific pharmacological treatment for a congenital myopathy.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Arbogast S,Beuvin M,Fraysse B,Zhou H,Muntoni F,Ferreiro A

doi

10.1002/ana.21644

subject

Has Abstract

pub_date

2009-06-01 00:00:00

pages

677-86

issue

6

eissn

0364-5134

issn

1531-8249

journal_volume

65

pub_type

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