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Phosphatase and tensin homolog (PTEN)-induced putative kinase 1 (PINK1)-dependent ubiquitination of endogenous Parkin attenuates mitophagy: study in human primary fibroblasts and induced pluripotent stem cell-derived neurons.
Rakovic, Aleksandar; Shurkewitsch, Katharina; Seibler, Philip et al.
2013In The Journal of biological chemistry, 288 (4), p. 2223-37
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Keywords :
Cell Line; Dose-Response Relationship, Drug; Fibroblasts/cytology; Homozygote; Humans; Induced Pluripotent Stem Cells/cytology; Lung/cytology; Microscopy, Fluorescence/methods; Mitochondria/metabolism; Mitochondrial Degradation; Models, Biological; Mutation; Mutation, Missense; Neurons/cytology/metabolism; Parkinson Disease/metabolism; Protein Kinases/metabolism; Stem Cells/cytology; Ubiquitin/chemistry/metabolism; Ubiquitin-Protein Ligases/metabolism
Abstract :
[en] Mutations in the E3 ubiquitin ligase Parkin and the mitochondrial PTEN-induced putative kinase 1 (PINK1) have been identified to cause autosomal recessive forms of familial Parkinson disease, with PINK1 functioning upstream of Parkin in a pathway important for the maintenance of mitochondrial function and morphology. Upon the loss of the mitochondrial membrane potential, Parkin translocates to mitochondria in a PINK1-dependent manner to ubiquitinate mitochondrial proteins. Parkin-mediated polyubiquitination of outer mitochondrial membrane (OMM) proteins recruits the ubiquitin- and LC3-binding adaptor protein p62 to mitochondria and induces mitophagy. Although previous studies examined mitophagy in established cell lines through overexpression approaches, there is an imperative to study the role of endogenous Parkin and PINK1 in human-derived and biologically relevant cell models. Here, we demonstrate in human primary fibroblasts and induced pluripotent stem-derived neurons from controls and PINK1 mutation carriers that endogenous levels of Parkin are not sufficient to initiate mitophagy upon loss of the mitochondrial membrane potential, caused by its (self-)ubiquitination, followed by degradation via the ubiquitin proteasome system. Next, we showed differential PINK1-dependent, Parkin-mediated ubiquitination of OMM proteins, which is Parkin dose-dependent and affects primarily OMM proteins of higher molecular mass. In contrast to the situation fibroblasts, we did not detect mitophagy in induced pluripotent stem-derived neurons even upon overexpression of Parkin. Taken together, our data demonstrate that mitophagy differs between human non-neuronal and neuronal cells and between "endogenous" and "Parkin-overexpressing" cellular models.
Disciplines :
UNKNOWN KEY #A01
Author, co-author :
Rakovic, Aleksandar
Shurkewitsch, Katharina
Seibler, Philip
Grünewald, Anne  
Zanon, Alessandra
Hagenah, Johann
Krainc, Dimitri
Klein, Christine 
External co-authors :
yes
Language :
English
Title :
Phosphatase and tensin homolog (PTEN)-induced putative kinase 1 (PINK1)-dependent ubiquitination of endogenous Parkin attenuates mitophagy: study in human primary fibroblasts and induced pluripotent stem cell-derived neurons.
Publication date :
2013
Journal title :
The Journal of biological chemistry
ISSN :
0021-9258
eISSN :
1083-351X
Volume :
288
Issue :
4
Pages :
2223-37
Peer reviewed :
Peer reviewed
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since 05 February 2016

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