Journal
AUTOPHAGY
Volume 15, Issue 1, Pages 113-130Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/15548627.2018.1509818
Keywords
Autophagy; glucocerebrosidase; mitochondrial dysfunction; mitophagy; Parkinson disease
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Funding
- National Institute of Mental Health (NIMH) [K01 MH096956]
- National Institute of Neurological Disorders and Stroke (NINDS) [K08 NS083738]
- JPB Foundation
- Parkinson's Disease Foundation
- New York Community Trust
- Michael J. Fox Foundation for Parkinson's Research
- National Institute on Aging (NIA) [AG049402]
- NINDS [NS082205, NS38377]
- Adrienne Helis Malvin Medical Research Foundation
- Diana Helis Henry Medical Research Foundation
- Foundation's Parkinson's Disease Program, H-1, H-2013
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Heterozygous mutations in GBA, the gene encoding the lysosomal enzyme glucosylceramidase beta/beta-glucocerebrosidase, comprise the most common genetic risk factor for Parkinson disease (PD), but the mechanisms underlying this association remain unclear. Here, we show that in Gba(L444P/WT) knockin mice, the L444P heterozygous Gba mutation triggers mitochondrial dysfunction by inhibiting autophagy and mitochondrial priming, two steps critical for the selective removal of dysfunctional mitochondria by autophagy, a process known as mitophagy. In SHSY-5Y neuroblastoma cells, the overexpression of L444P GBA impeded mitochondrial priming and autophagy induction when endogenous lysosomal GBA activity remained intact. By contrast, genetic depletion of GBA inhibited lysosomal clearance of autophagic cargo. The link between heterozygous GBA mutations and impaired mitophagy was corroborated in postmortem brain tissue from PD patients carrying heterozygous GBA mutations, where we found increased mitochondrial content, mitochondria oxidative stress and impaired autophagy. Our findings thus suggest a mechanistic basis for mitochondrial dysfunction associated with GBA heterozygous mutations.
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