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Dernière publication 01/05/2005

Doxycycline attenuates and delays toxicity of the oculopharyngeal muscular dystr

The muscular dystrophies are a heterogeneous group of disorders for which there are currently no cures. Oculopharyngeal muscular dystrophy (OPMD)...

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    [title] => Doxycycline attenuates and delays toxicity of the oculopharyngeal muscular dystr
    [paragraph] => Doxycycline attenuates and delays toxicity of the oculopharyngeal muscular dystrophy mutation in transgenic mice.
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Authors
J. E. Davies, L. Wang, L. Garcia-Oroz, L. J. Cook, C. Vacher et al.

 Lab
Department of Medical Genetics, Cambridge Institute for Medical Research, Wellcome/MRC Building, Addenbrooke's Hospital, Cambridge, UK ; Department of Histopathology, Addenbrooke's Hospital, Cambridge, UK.
Journal
Nature Medicine
Abstract
The muscular dystrophies are a heterogeneous group of disorders for which there are currently no cures. Oculopharyngeal muscular dystrophy (OPMD) is an autosomal dominant late-onset, progressive disease that generally presents in the fifth or sixth decade with dysphagia, ptosis and proximal limb weakness. OPMD is caused by the abnormal expansion of a (GCG)n trinucleotide repeat in the coding region of the poly-(A) binding protein nuclear 1 (PABPN1) gene. In unaffected individuals, (GCG)6 codes for the first six alanines in a homopolymeric stretch of ten alanines. In most individuals with OPMD this (GCG)6 repeat is expanded to (GCG)8_13, leading to a stretch of 12_17 alanines in mutant PABPN1. PABPN1 with an expanded polyalanine tract forms aggregates consisting of tubular filaments within the nuclei of skeletal muscle fibers. We have developed a transgenic mouse model of OPMD that manifests progressive muscle weakness accompanied by intranuclear aggregates and TUNEL-stained nuclei in skeletal muscle fibers. The onset and severity of these abnormalities were substantially delayed and attenuated by doxycycline treatment, which may exert its therapeutic effect by reducing aggregates and by distinct antiapoptotic properties. Doxycycline may represent a safe and feasible therapeutic for this disease.
BIOSEB Instruments Used
Grip strength test (BIO-GS3)
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Une méthode simple pour quantifier objectivement la force musculaire des rats et souris et l'effet de drogues, toxines, maladies musculaires (ex: myopathie) et neurodégénératives. Cette mesure de force est souvent employée en association avec le test de coordination motrice ROTAROD: un sujet présentant une coordination normale montrera des résultats médiocres en cas de faible force musculaire. Un must pour vos recherches sur l'activité, la coordination et le contrôle musculaire: particulièrement utile pour vos études sur les maladies de Parkinson et Huntington.
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