Abstract:
BACKGROUND:Spinal muscular atrophy (SMA) is an autosomal recessive disorder that affects the motoneurons of the spinal anterior horn, resulting in hypotonia and muscle weakness. The disease is caused by deletion or mutation in the telomeric copy of SMN gene (SMN1) and clinical severity is in part determined by the copy number of the centromeric copy of the SMN gene (SMN2). The SMN2 mRNA lacks exon 7, resulting in a production of lower amounts of the full-length SMN protein. Knowledge of the molecular mechanism of diseases has led to the discovery of drugs capable of increasing SMN protein level through activation of SMN2 gene. One of these drugs is the valproic acid (VPA), a histone deacetylase inhibitor. METHODS:Twenty-two patients with type II and III SMA, aged between 2 and 18 years, were treated with VPA and were evaluated five times during a one-year period using the Manual Muscle Test (Medical Research Council scale-MRC), the Hammersmith Functional Motor Scale (HFMS), and the Barthel Index. RESULTS:After 12 months of therapy, the patients did not gain muscle strength. The group of children with SMA type II presented a significant gain in HFMS scores during the treatment. This improvement was not observed in the group of type III patients. The analysis of the HFMS scores during the treatment period in the groups of patients younger and older than 6 years of age did not show any significant result. There was an improvement of the daily activities at the end of the VPA treatment period. CONCLUSION:Treatment of SMA patients with VPA may be a potential alternative to alleviate the progression of the disease. TRIAL REGISTRATION:ClinicalTrials.gov: NCT01033331.
journal_name
BMC Neuroljournal_title
BMC neurologyauthors
Darbar IA,Plaggert PG,Resende MB,Zanoteli E,Reed UCdoi
10.1186/1471-2377-11-36subject
Has Abstractpub_date
2011-03-24 00:00:00pages
36issn
1471-2377pii
1471-2377-11-36journal_volume
11pub_type
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