The PINK1/Parkin pathway regulates mitochondrial dynamics and function in mammalian hippocampal and dopaminergic neurons.

Abstract:

:PTEN-induced putative kinase 1 (PINK1) and Parkin act in a common pathway to regulate mitochondrial dynamics, the involvement of which in the pathogenesis of Parkinson's disease (PD) is increasingly being appreciated. However, how the PINK1/Parkin pathway influences mitochondrial function is not well understood, and the exact role of this pathway in controlling mitochondrial dynamics remains controversial. Here we used mammalian primary neurons to examine the function of the PINK1/Parkin pathway in regulating mitochondrial dynamics and function. In rat hippocampal neurons, PINK1 or Parkin overexpression resulted in increased mitochondrial number, smaller mitochondrial size and reduced mitochondrial occupancy of neuronal processes, suggesting that the balance of mitochondrial fission/fusion dynamics is tipped toward more fission. Conversely, inactivation of PINK1 resulted in elongated mitochondria, indicating that the balance of mitochondrial fission/fusion dynamics is tipped toward more fusion. Furthermore, overexpression of the fission protein Drp1 (dynamin-related protein 1) or knocking down of the fusion protein OPA1 (optical atrophy 1) suppressed PINK1 RNAi-induced mitochondrial morphological defect, and overexpression of PINK1 or Parkin suppressed the elongated mitochondria phenotype caused by Drp1 RNAi. Functionally, PINK1 knockdown and overexpression had opposite effects on dendritic spine formation and neuronal vulnerability to excitotoxicity. Finally, we found that PINK1/Parkin similarly influenced mitochondrial dynamics in rat midbrain dopaminergic neurons. These results, together with previous findings in Drosophila dopaminergic neurons, indicate that the PINK1/Parkin pathway plays conserved roles in regulating neuronal mitochondrial dynamics and function.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Yu W,Sun Y,Guo S,Lu B

doi

10.1093/hmg/ddr235

subject

Has Abstract

pub_date

2011-08-15 00:00:00

pages

3227-40

issue

16

eissn

0964-6906

issn

1460-2083

pii

ddr235

journal_volume

20

pub_type

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