Abstract:
:Spinal muscular atrophy (SMA), a frequent neurodegenerative disease, is caused by reduced levels of functional survival of motoneuron (SMN) protein. SMN is involved in multiple pathways, including RNA metabolism and splicing as well as motoneuron development and function. Here we provide evidence for a major contribution of the Rho-kinase (ROCK) pathway in SMA pathogenesis. Using an in vivo protein interaction system based on SUMOylation of proteins, we found that SMN is directly interacting with profilin2a. Profilin2a binds to a stretch of proline residues in SMN, which is heavily impaired by a novel SMN2 missense mutation (S230L) derived from a SMA patient. In different SMA models, we identified differential phosphorylation of the ROCK-downstream targets cofilin, myosin-light chain phosphatase and profilin2a. We suggest that hyper-phosphorylation of profilin2a is the molecular link between SMN and the ROCK pathway repressing neurite outgrowth in neuronal cells. Finally, we found a neuron-specific increase in the F-/G-actin ratio that further support the role of actin dynamics in SMA pathogenesis.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Nölle A,Zeug A,van Bergeijk J,Tönges L,Gerhard R,Brinkmann H,Al Rayes S,Hensel N,Schill Y,Apkhazava D,Jablonka S,O'mer J,Srivastav RK,Baasner A,Lingor P,Wirth B,Ponimaskin E,Niedenthal R,Grothe C,Claus Pdoi
10.1093/hmg/ddr425subject
Has Abstractpub_date
2011-12-15 00:00:00pages
4865-78issue
24eissn
0964-6906issn
1460-2083pii
ddr425journal_volume
20pub_type
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