Proteomic and functional analyses in disease models reveal CLN5 protein involvement in mitochondrial dysfunction

Stefano Doccini, Federica Morani, Claudia Nesti, Francesco Pezzini, Giulio Calza, Rabah Soliymani, Giovanni Signore, Silvia Rocchiccioli, Katja M. Kanninen, Mikko T. Huuskonen, Marc Baumann, Alessandro Simonati, Maciej Lalowski, Filippo M. Santorelli

Research output: Contribution to journalArticleScientificpeer-review

Abstract

CLN5 disease is a rare form of late-infantile neuronal ceroid lipofuscinosis (NCL) caused by mutations in theCLN5genethat encodes a protein whose primary function and physiological roles remains unresolved. Emerging lines of evidence point to mitochondrial dysfunction in the onset and progression of several forms of NCL, offering new insights into putative biomarkers and shared biological processes. In this work, we employed cellular and murine models of the disease, in an effort to clarify disease pathways associated with CLN5 depletion. A mitochondria-focused quantitative proteomics approach followed by functional validations using cell biology and immunofluorescence assays revealed an impairment of mitochondrial functions in different CLN5 KO cell models and inCln5−/−cerebral cortex, which well correlated with disease progression. A visible impairment of autophagy machinery coupled with alterations of key parameters of mitophagy activation process functionally linked CLN5 protein to the process of neuronal injury. The functional link between impaired cellular respiration and activation of mitophagy pathways in the human CLN5 disease condition was corroborated by translating organelle-specific proteome findings to CLN5patients’fibroblasts. Our study highlights the involvement of CLN5 in activation of mitophagy and mitochondrial homeostasis offering new insights into alternative strategies towards the CLN5 disease treatment.
Original languageEnglish
Article number18
JournalCell death discovery
Volume6
Issue number1
Number of pages14
ISSN2058-7716
DOIs
Publication statusPublished - 30 Mar 2020
MoE publication typeA1 Journal article-refereed

Fields of Science

  • NEURONAL CEROID-LIPOFUSCINOSIS
  • OXIDATIVE DAMAGE
  • MOUSE MODEL
  • INFANTILE
  • INTERACTOME
  • MUTATIONS
  • PHENOTYPE
  • 3111 Biomedicine
  • 1182 Biochemistry, cell and molecular biology

Cite this