title: Pharmacological activation of PPARbeta/delta stimulates utrophin A expression in skeletal muscle fibers and restores sarcolemmal integrity in mature mdx mice.
abstract: A therapeutic strategy to treat Duchenne muscular dystrophy (DMD) involves identifying compounds that can elevate utrophin A expression in muscle fibers of affected patients. The dystrophin homologue utrophin A can functionally substitute for dystrophin when its levels are enhanced in the mdx mouse model of DMD. Utrophin A expression in skeletal muscle is regulated by mechanisms that promote the slow myofiber program. Since activation of peroxisome proliferator-activated receptor (PPAR) beta/delta promotes the slow oxidative phenotype in skeletal muscle, we initiated studies to determine whether pharmacological activation of PPARbeta/delta provides functional benefits to the mdx mouse. GW501516, a PPARbeta/delta agonist, was found to stimulate utrophin A mRNA levels in C2C12 muscle cells through an element in the utrophin A promoter. Expression of PPARbeta/delta was greater in skeletal muscles of mdx versus wild-type mice. We treated 5-7-week-old mdx mice with GW501516 for 4 weeks. This treatment increased the percentage of muscle fibers expressing slower myosin heavy chain isoforms and stimulated utrophin A mRNA levels leading to its increased expression at the sarcolemma. Expression of alpha1-syntrophin and beta-dystroglycan was restored to the sarcolemma. Improvement of mdx sarcolemmal integrity was evidenced by decreased intracellular IgM staining and decreased in vivo Evans blue dye (EBD) uptake. GW501516 treatment also conferred protection against eccentric contraction (ECC)-induced damage of mdx skeletal muscles, as shown by a decreased contraction-induced force drop and reduction of dye uptake during ECC. These results demonstrate that pharmacological activation of PPARbeta/delta might provide functional benefits to DMD patients through enhancement of utrophin A expression.
authors.affiliation: Department of Cellular & Molecular Medicine and Center for Neuromuscular Disease, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada K1H 8M5.
authors.forename: Pedro
authors.initials: P
authors.lastname: Miura
authors.forename: Joe V
authors.initials: JV
authors.lastname: Chakkalakal
authors.forename: Louise
authors.initials: L
authors.lastname: Boudreault
authors.forename: Guy
authors.initials: G
authors.lastname: Bélanger
authors.forename: Richard L
authors.initials: RL
authors.lastname: Hébert
authors.forename: Jean-Marc
authors.initials: JM
authors.lastname: Renaud
authors.forename: Bernard J
authors.initials: BJ
authors.lastname: Jasmin
mesh_terms: D000818:Animals; D002460:Cell Line; D004195:Disease Models, Animal; D015870:Gene Expression / Q000187:drug effects*; D006801:Humans; D051379:Mice; D008810:Mice, Inbred C57BL; D018101:Mice, Inbred mdx; D018485:Muscle Fibers, Skeletal / Q000187:drug effects / Q000378:metabolism*; D020388:Muscular Dystrophy, Duchenne / Q000188:drug therapy* / Q000235:genetics / Q000378:metabolism; D047493:PPAR alpha / Q000819:agonists / Q000235:genetics / Q000378:metabolism*; D048068:PPAR-beta / Q000819:agonists / Q000235:genetics / Q000378:metabolism*; D012508:Sarcolemma / Q000187:drug effects / Q000378:metabolism; D013844:Thiazoles / Q000008:administration & dosage*; D049411:Utrophin / Q000235:genetics* / Q000378:metabolism
chemical_list: C425931:GW 501516; D047493:PPAR alpha; D048068:PPAR-beta; D013844:Thiazoles; C483600:Utrn protein, mouse; D049411:Utrophin