Mitophagy of damaged mitochondria occurs locally in distal neuronal axons and requires PINK1 and Parkin

Ghazaleh Ashrafi, Julia S. Schlehe, Matthew J. LaVoie, Thomas L. Schwarz

Research output: Contribution to journalArticle

250 Scopus citations

Abstract

To minimize oxidative damage to the cell, malfunctioning mitochondria need to be removed by mitophagy. In neuronal axons, mitochondrial damage may occur in distal regions, far from the soma where most lysosomal degradation is thought to occur. In this paper, we report that PINK1 and Parkin, two Parkinson's disease-associated proteins, mediate local mitophagy of dysfunctional mitochondria in neuronal axons. To reduce cytotoxicity and mimic physiological levels of mitochondrial damage, we selectively damaged a subset of mitochondria in hippocampal axons. Parkin was rapidly recruited to damaged mitochondria in axons followed by formation of LC3-positive autophagosomes and LAMP1-positive lysosomes. In PINK1-/- axons, damaged mitochondria did not accumulate Parkin and failed to be engulfed in autophagosomes. Similarly, initiation of mitophagy was blocked in Parkin-/- axons. Our findings demonstrate that the PINK1-Parkin-mediated pathway is required for local mitophagy in distal axons in response to focal damage. Local mitophagy likely provides rapid neuroprotection against oxidative stress without a requirement for retrograde transport to the soma.

Original languageEnglish
Pages (from-to)655-670
Number of pages16
JournalJournal of Cell Biology
Volume206
Issue number5
DOIs
StatePublished - 2014
Externally publishedYes

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