LKB1-regulated adaptive mechanisms are essential for neuronal survival following mitochondrial dysfunction.

Abstract:

:Mitochondrial dysfunction plays an important role in the etiology of neurodegenerative diseases. However, the progressive nature of neuronal loss in genetic models of mitochondrial dysfunction suggests the presence of compensatory mechanisms promoting neuronal survival under these conditions. Here, we identified the energy metabolism kinase LKB1 as a key regulator of the compensatory mechanisms activated in neurons, following mitochondrial dysfunction. To accomplish this, we have created an in vivo neurodegenerative model based on the deletion of the mitochondrial protein apoptosis-inducing factor (AIF) in postmitotic neurons. Loss of mitochondrial function caused by AIF deletion induced several adaptive mechanisms, including increased glycolysis and mitochondrial biogenesis. Importantly, the activation of these adaptive mechanisms was abrogated by the deletion of one allele of LKB1, resulting in impaired neuronal survival. Because loss of mitochondrial function is a central mechanism implicated in neurodegenerative diseases, modulation of LKB1-dependent pathways may represent an important strategy to preserve neuronal survival and function.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Germain M,Nguyen AP,Khacho M,Patten DA,Screaton RA,Park DS,Slack RS

doi

10.1093/hmg/dds500

subject

Has Abstract

pub_date

2013-03-01 00:00:00

pages

952-62

issue

5

eissn

0964-6906

issn

1460-2083

pii

dds500

journal_volume

22

pub_type

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