Reference : Mitochondrial proteolytic stress induced by loss of mortalin function is rescued by P...
Scientific journals : Article
Life sciences : Genetics & genetic processes
http://hdl.handle.net/10993/17211
Mitochondrial proteolytic stress induced by loss of mortalin function is rescued by Parkin and PINK1.
English
Burbulla, L. F. [> >]
Fitzgerald, J. C. [> >]
Stegen, K. [> >]
Westermeier, J. [> >]
Thost, A.-K. [> >]
Kato, H. [> >]
Mokranjac, D. [> >]
Sauerwald, J. [> >]
Martins, Luisa [> >]
Woitalla, D. [> >]
Rapaport, D. [> >]
Riess, O. [> >]
Proikas-Cezanne, T. [> >]
Rasse, T. M. [> >]
Krüger, Rejko mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Life Science Research Unit]
2014
Cell death & disease
5
e1180
Yes (verified by ORBilu)
2041-4889
England
[en] The mitochondrial chaperone mortalin was implicated in Parkinson's disease (PD) because of its reduced levels in the brains of PD patients and disease-associated rare genetic variants that failed to rescue impaired mitochondrial integrity in cellular knockdown models. To uncover the molecular mechanisms underlying mortalin-related neurodegeneration, we dissected the cellular surveillance mechanisms related to mitochondrial quality control, defined the effects of reduced mortalin function at the molecular and cellular levels and investigated the functional interaction of mortalin with Parkin and PINK1, two PD-related proteins involved in mitochondrial homeostasis. We found that reduced mortalin function leads to: (1) activation of the mitochondrial unfolded protein response (UPR(mt)), (2) increased susceptibility towards intramitochondrial proteolytic stress, (3) increased autophagic degradation of fragmented mitochondria and (4) reduced mitochondrial mass in human cells in vitro and ex vivo. These alterations caused increased vulnerability toward apoptotic cell death. Proteotoxic perturbations induced by either partial loss of mortalin or chemical induction were rescued by complementation with native mortalin, but not disease-associated mortalin variants, and were independent of the integrity of autophagic pathways. However, Parkin and PINK1 rescued loss of mortalin phenotypes via increased lysosomal-mediated mitochondrial clearance and required intact autophagic machinery. Our results on loss of mortalin function reveal a direct link between impaired mitochondrial proteostasis, UPR(mt) and PD and show that effective removal of dysfunctional mitochondria via either genetic (PINK1 and Parkin overexpression) or pharmacological intervention (rapamycin) may compensate mitochondrial phenotypes.
Luxembourg Centre for Systems Biomedicine (LCSB): Clinical & Experimental Neuroscience (Krüger Group)
http://hdl.handle.net/10993/17211
10.1038/cddis.2014.103

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