Muscular dystrophy associated mutations in caveolin-1 induce neurotransmission and locomotion defects in Caenorhabditis elegans.

Department of Zoology, University of Cambridge, Downing Street, Cambridge, CB2 3EJ, UK.
Mutations in human caveolin-3 are known to underlie a range of myopathies. The cav-1 gene of Caenorhabditis elegans is a homologue of human caveolin-3 and is expressed in both neurons and body wall muscles. Within the body wall muscle CAV-1 localises adjacent to neurons, most likely at the neuromuscular junction (NMJ). Using fluorescently tagged CAV-1 and pre- and post-synaptic markers we demonstrate that CAV-1 co-localises with UNC-63, a post-synaptic marker, but not with several pre-synaptic markers. To establish a model for human muscular dystrophies caused by dominant-negative mutations in caveolin-3 we created transgenic animals carrying versions of cav-1 with homologous mutations. These animals had increased sensitivity to levamisole, suggesting a role for cav-1 at the NMJ. Animals carrying a deletion in cav-1 show a similar sensitivity. Sensitivity to levamisole and locomotion were also perturbed in animals carrying a dominant-negative cav-1 and a mutation in dynamin, which is a protein known to interact with caveolins. Thus, indicating an interaction between CAV-1 and dynamin at the NMJ and/or in neurons.
Mesh Terms:
Animals, Animals, Genetically Modified, Antinematodal Agents, Caenorhabditis elegans, Caenorhabditis elegans Proteins, Caveolin 1, Disease Models, Animal, Dynamin I, Humans, Levamisole, Movement, Muscular Dystrophies, Mutation, Neuromuscular Junction, Polymerase Chain Reaction
Invert. Neurosci. Sep. 01, 2007; 7(3);157-64 [PUBMED:17629760]
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