| First Author | Sambri I | Year | 2017 |
| Journal | EMBO Mol Med | Volume | 9 |
| Issue | 1 | Pages | 112-132 |
| PubMed ID | 27881461 | Mgi Jnum | J:329664 |
| Mgi Id | MGI:6759099 | Doi | 10.15252/emmm.201606965 |
| Citation | Sambri I, et al. (2017) Lysosomal dysfunction disrupts presynaptic maintenance and restoration of presynaptic function prevents neurodegeneration in lysosomal storage diseases. EMBO Mol Med 9(1):112-132 |
| abstractText | Lysosomal storage disorders (LSDs) are inherited diseases characterized by lysosomal dysfunction and often showing a neurodegenerative course. There is no cure to treat the central nervous system in LSDs. Moreover, the mechanisms driving neuronal degeneration in these pathological conditions remain largely unknown. By studying mouse models of LSDs, we found that neurodegeneration develops progressively with profound alterations in presynaptic structure and function. In these models, impaired lysosomal activity causes massive perikaryal accumulation of insoluble alpha-synuclein and increased proteasomal degradation of cysteine string protein alpha (CSPalpha). As a result, the availability of both alpha-synuclein and CSPalpha at nerve terminals strongly decreases, thus inhibiting soluble NSF attachment receptor (SNARE) complex assembly and synaptic vesicle recycling. Aberrant presynaptic SNARE phenotype is recapitulated in mice with genetic ablation of one allele of both CSPalpha and alpha-synuclein. The overexpression of CSPalpha in the brain of a mouse model of mucopolysaccharidosis type IIIA, a severe form of LSD, efficiently re-established SNARE complex assembly, thereby ameliorating presynaptic function, attenuating neurodegenerative signs, and prolonging survival. Our data show that neurodegenerative processes associated with lysosomal dysfunction may be presynaptically initiated by a concomitant reduction in alpha-synuclein and CSPalpha levels at nerve terminals. They also demonstrate that neurodegeneration in LSDs can be slowed down by re-establishing presynaptic functions, thus identifying synapse maintenance as a novel potentially druggable target for brain treatment in LSDs. |
