Rajnish K Chaturvedi, Peter Adhihetty, Shubha Shukla, Thomas Hennessy, Noel Calingasan, Lichuan Yang, Anatoly Starkov, Mahmoud Kiaei, Milena Cannella, Jenny Sassone, Andrea Ciammola, Fernando Squitieri, M Flint Beal
We investigated the role of PPAR gamma coactivator 1alpha (PGC-1alpha) in muscle dysfunction in Huntington's disease (HD). We observed reduced PGC-1alpha and target genes expression in muscle of HD transgenic mice. We produced chronic energy deprivation in HD mice by administering the catabolic stressor beta-guanidinopropionic acid (GPA), a creatine analogue that reduces ATP levels, activates AMP-activated protein kinase (AMPK), which in turn activates PGC-1alpha. Treatment with GPA resulted in increased expression of AMPK, PGC-1alpha target genes, genes for oxidative phosphorylation, electron transport chain and mitochondrial biogenesis, increased oxidative muscle fibers, numbers of mitochondria and motor performance in wild-type, but not in HD mice...
August 15, 2009: Human Molecular Genetics