Leucine-rich repeat kinase 2 regulates autophagy through a calcium-dependent pathway involving NAADP.
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Gomez-Suaga P, Luzon-Toro B, Churamani D, Zhang L, Bloor-Young D, Patel S, Woodman PG, Churchill GC, Hilfiker S
Leucine-rich repeat kinase 2 regulates autophagy through a calcium-dependent pathway involving NAADP.
Hum Mol Genet. 2012 Feb 1;21(3):511-25. doi: 10.1093/hmg/ddr481. Epub 2011 Oct 19.
- PubMed ID
- 22012985 [ View in PubMed]
- Abstract
Mutations in the leucine-rich repeat kinase-2 (LRRK2) gene cause late-onset Parkinson's disease, but its physiological function has remained largely unknown. Here we report that LRRK2 activates a calcium-dependent protein kinase kinase-beta (CaMKK-beta)/adenosine monophosphate (AMP)-activated protein kinase (AMPK) pathway which is followed by a persistent increase in autophagosome formation. Simultaneously, LRKR2 overexpression increases the levels of the autophagy receptor p62 in a protein synthesis-dependent manner, and decreases the number of acidic lysosomes. The LRRK2-mediated effects result in increased sensitivity of cells to stressors associated with abnormal protein degradation. These effects can be mimicked by the lysosomal Ca(2+)-mobilizing messenger nicotinic acid adenine dinucleotide phosphate (NAADP) and can be reverted by an NAADP receptor antagonist or expression of dominant-negative receptor constructs. Collectively, our data indicate a molecular mechanism for LRRK2 deregulation of autophagy and reveal previously unidentified therapeutic targets.