Autophagy-lysosome pathway alterations and alpha-synuclein up-regulation in the subtype of neuronal ceroid lipofuscinosis, CLN5 disease

Sci Rep. 2019 Jan 17;9(1):151. doi: 10.1038/s41598-018-36379-z.

Abstract

Neuronal ceroid lipofuscinoses (NCLs) are a group of inherited neurodegenerative lysosomal storage disorders. CLN5 deficiency causes a subtype of NCL, referred to as CLN5 disease. CLN5 is a soluble lysosomal protein with an unclear function in the cell. Increased levels of the autophagy marker protein LC3-II have been reported in several subtypes of NCLs. In this report, we examine whether autophagy is altered in CLN5 disease. We found that the basal level of LC3-II was elevated in both CLN5 disease patient fibroblasts and CLN5-deficient HeLa cells. Further analysis using tandem fluorescent mRFP-GFP-LC3 showed the autophagy flux was increased. We found the alpha-synuclein (α-syn) gene SNCA was highly up-regulated in CLN5 disease patient fibroblasts. The aggregated form of α-syn is well known for its role in the pathogenicity of Parkinson's disease. Higher α-syn protein levels confirmed the SNCA up-regulation in both patient cells and CLN5 knockdown HeLa cells. Furthermore, α-syn was localized to the vicinity of lysosomes in CLN5 deficient cells, indicating it may have a lysosome-related function. Intriguingly, knocking down SNCA reversed lysosomal perinuclear clustering caused by CLN5 deficiency. These results suggest α-syn may affect lysosomal clustering in non-neuronal cells, similar to its role in presynaptic vesicles in neurons.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Autophagy
  • Fibroblasts / metabolism*
  • Fibroblasts / pathology
  • HeLa Cells
  • Humans
  • Lysosomal Membrane Proteins / metabolism*
  • Lysosomes / metabolism
  • Microtubule-Associated Proteins / metabolism*
  • Neuronal Ceroid-Lipofuscinoses / metabolism*
  • Up-Regulation
  • alpha-Synuclein / metabolism*

Substances

  • CLN5 protein, human
  • Lysosomal Membrane Proteins
  • MAP1LC3B protein, human
  • Microtubule-Associated Proteins
  • SNCA protein, human
  • alpha-Synuclein