Neuronal metabolic rewiring promotes resilience to neurodegeneration caused by mitochondrial dysfunction.

Abstract:

:Neurodegeneration in mitochondrial disorders is considered irreversible because of limited metabolic plasticity in neurons, yet the cell-autonomous implications of mitochondrial dysfunction for neuronal metabolism in vivo are poorly understood. Here, we profiled the cell-specific proteome of Purkinje neurons undergoing progressive OXPHOS deficiency caused by disrupted mitochondrial fusion dynamics. We found that mitochondrial dysfunction triggers a profound rewiring of the proteomic landscape, culminating in the sequential activation of precise metabolic programs preceding cell death. Unexpectedly, we identified a marked induction of pyruvate carboxylase (PCx) and other anaplerotic enzymes involved in replenishing tricarboxylic acid cycle intermediates. Suppression of PCx aggravated oxidative stress and neurodegeneration, showing that anaplerosis is protective in OXPHOS-deficient neurons. Restoration of mitochondrial fusion in end-stage degenerating neurons fully reversed these metabolic hallmarks, thereby preventing cell death. Our findings identify a previously unappreciated pathway conferring resilience to mitochondrial dysfunction and show that neurodegeneration can be reversed even at advanced disease stages.

journal_name

Sci Adv

journal_title

Science advances

authors

Motori E,Atanassov I,Kochan SMV,Folz-Donahue K,Sakthivelu V,Giavalisco P,Toni N,Puyal J,Larsson NG

doi

10.1126/sciadv.aba8271

subject

Has Abstract

pub_date

2020-08-28 00:00:00

pages

eaba8271

issue

35

issn

2375-2548

pii

aba8271

journal_volume

6

pub_type

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