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Impaired mitochondrial transport and Parkin-independent degeneration of respiratory chain-deficient dopamine neurons in vivo

Open access
Sterky, Fredrik H., Lee, Seungmin, Wibom, Rolf, Olson, Lars, Larsson, Nils-Göran·2011·Proceedings of the National Academy of Sciences

Abstract

Mitochondrial dysfunction is heavily implicated in Parkinson disease (PD) as exemplified by the finding of an increased frequency of respiratory chain-deficient dopamine (DA) neurons in affected patients. An inherited form of PD is caused by impaired function of Parkin, an E3 ubiquitin ligase reported to translocate to defective mitochondria in vitro to facilitate their clearance. We have developed a reporter mouse to assess mitochondrial morphology in DA neurons in vivo and show here that respiratory chain deficiency leads to fragmentation of the mitochondrial network and to the formation of large cytoplasmic bodies derived from mitochondria. Surprisingly, the dysfunctional mitochondria do not recruit Parkin in vivo, and neither the clearance of defective mitochondria nor the neurodegeneration phenotype is affected by the absence of Parkin. We also show that anterograde axonal transport of mitochondria is impaired in respiratory chain-deficient DA neurons, leading to a decreased supply of mitochondria to the axonal terminals.

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Metadata

Authors
Sterky, F. H., Lee, S., Wibom, R., Olson, L., & Larsson, N.-G.
Venue
Proceedings of the National Academy of Sciences
Published
2011-07-18
Volume
108
Issue
31
Pages
12937-12942
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2061500740
Cited by
299
References
20
FWCI
16.65
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Impaired mitochondrial transport and Parkin-independent degeneration of respiratory chain-deficient dopamine neurons in vivo. https://app.cochat.ai/papers/10.1073/pnas.1103295108
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Sterky, F. H., Lee, S., Wibom, R., Olson, L., & Larsson, N.-G. (2011). Impaired mitochondrial transport and Parkin-independent degeneration of respiratory chain-deficient dopamine neurons in vivo. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1103295108

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