Journal
JOURNAL OF NEUROPATHOLOGY AND EXPERIMENTAL NEUROLOGY
Volume 69, Issue 5, Pages 511-520Publisher
OXFORD UNIV PRESS INC
DOI: 10.1097/NEN.0b013e3181db8100
Keywords
Dopaminergic neuron; JNK3; Paraquat; Parkinson disease; Reactive oxygen species; Rotenone
Categories
Funding
- National Institutes of Health [ES012215, ES013696]
- KOSEF
- National Institute of Child Health and Human Development [P30 HD02274]
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Mechanistic studies underlying dopaminergic neuron death may identify new drug targets for the treatment of Parkinson disease. Epidemiological studies have linked pesticide exposure to increased risk for sporadic Parkinson disease. Here, we investigated the role of c-Jun-N-terminal kinase 3 (JNK3), a neural-specific JNK isoform, in dopaminergic neuron death induced by the pesticides rotenone and paraquat. The role of JNK3 was evaluated using RNA silencing and gene deletion to block JNK3 signaling. Using an antibody that recognizes all isoforms of activated JNKs, we found that paraquat and rotenone stimulate JNK phosphorylation in primary cultured dopaminergic neurons. In cultured neurons transfected with Jnk3-specific siRNA and in neurons from Jnk3(-/-) mice, JNK phosphorylation was nearly abolished, suggesting that JNK3 is the main JNK isoform activated in dopaminergic neurons by these pesticides. Paraquat-and rotenone-induced death of dopaminergic neurons was also significantly reduced by Jnk3 siRNA or Jnk3 gene deletion, and deletion of the Jnk3 gene completely attenuated paraquat-induced dopaminergic neuron death and motor deficits in vivo. Our data identify JNK3 as a common and critical mediator of dopaminergic neuron death induced by paraquat and rotenone, suggesting that it is a potential drug target for Parkinson disease treatment.
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