Hydroxyurea enhances SMN2 gene expression in spinal muscular atrophy cells.

Abstract:

:Spinal muscular atrophy (SMA) is a motor neuron disease caused by dysfunction of the survival motor neuron (SMN) gene. Human SMN gene is present in duplicated copies: SMN1 and SMN2. More than 95% of patients with SMA lack a functional SMN1 but retain at least one copy of SMN2. Unlike SMN1, SMN2 is primarily transcribed into truncated messenger RNA and produces low levels of SMN protein. We tested a therapeutic strategy by treating cultured lymphocytes from patients with SMA with hydroxyurea to modify SMN2 gene expression and to increase the production of SMN protein. Twenty lymphoblastoid cell lines (15 SMA and 5 control lines) were treated with hydroxyurea at 5 concentrations (0.5, 5, 50, 500, and 5,000 microg/ml) and 3 time points (24, 48, and 72 hours). SMN2 gene copy numbers were determined using real-time quantitative polymerase chain reaction. Hydroxyurea treatment resulted in a time-related and dose-dependent increase in the ratio of full-length to truncated SMN messenger RNA. SMN protein levels and intranuclear gems also were significantly increased in these hydroxyurea-treated cells. The SMN2 gene copy number correlated inversely with the SMA phenotypic severity. This study provides the first evidence for a therapeutic indication of hydroxyurea in SMA.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Grzeschik SM,Ganta M,Prior TW,Heavlin WD,Wang CH

doi

10.1002/ana.20548

keywords:

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

194-202

issue

2

eissn

0364-5134

issn

1531-8249

journal_volume

58

pub_type

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