Volume 9, Issue 5 pp. 837-850

Differential regulation of NMDA receptor function by DJ-1 and PINK1

Ning Chang

Ning Chang

Division of Fundamental Neurobiology, Toronto Western Research Institute, University Health Network, Toronto, Ontario M5T 2S8, Canada

These authors contributed equally to this work.

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Lijun Li

Lijun Li

Division of Fundamental Neurobiology, Toronto Western Research Institute, University Health Network, Toronto, Ontario M5T 2S8, Canada

These authors contributed equally to this work.

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Rong Hu

Rong Hu

Department of Physiology and Cell Biology, University of Nevada School of Medicine, 1664 North Virginia Street, MS0352, Reno, NV 89557, USA

Department of Neurosurgery, Southwest Hospital, Chongqing 400038, China

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Yuexin Shan

Yuexin Shan

Division of Fundamental Neurobiology, Toronto Western Research Institute, University Health Network, Toronto, Ontario M5T 2S8, Canada

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Baosong Liu

Baosong Liu

Division of Fundamental Neurobiology, Toronto Western Research Institute, University Health Network, Toronto, Ontario M5T 2S8, Canada

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Lei Li

Lei Li

Research Institute of Surgery and Daping Hospital, Chongqing 400042, China

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Hanbin Wang

Hanbin Wang

Department of Internal Medicine, 307 Hospital, Beijing, 100071, China

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Hua Feng

Hua Feng

Department of Neurosurgery, Southwest Hospital, Chongqing 400038, China

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Dianshi Wang

Dianshi Wang

Division of Fundamental Neurobiology, Toronto Western Research Institute, University Health Network, Toronto, Ontario M5T 2S8, Canada

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Carol Cheung

Carol Cheung

Department of Pathology, University Health Network, Toronto, Ontario M5G 2C4, Canada

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Mingxia Liao

Mingxia Liao

Department of Physiology and Cell Biology, University of Nevada School of Medicine, 1664 North Virginia Street, MS0352, Reno, NV 89557, USA

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Qi Wan

Qi Wan

Division of Fundamental Neurobiology, Toronto Western Research Institute, University Health Network, Toronto, Ontario M5T 2S8, Canada

Department of Physiology and Cell Biology, University of Nevada School of Medicine, 1664 North Virginia Street, MS0352, Reno, NV 89557, USA

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First published: 16 September 2010
Citations: 13
Dr. Qi Wan, Department of Physiology & Cell Biology, University of Nevada School of Medicine, 1664 North Virginia Street, MS0352, Reno, NV 89557, USA. Tel.: 775-7844352; fax: 775-7846903; e-mail: [email protected]

Summary

Dysfunction of PTEN-induced kinase 1 (PINK1) or DJ-1 promotes neuronal death and is implicated in the pathogenesis of Parkinson’s disease, but the underlying mechanisms remain unclear. Given the roles of N-methyl-d-aspartate receptor (NMDAr)-mediated neurotoxicity in various brain disorders including cerebral ischemia and neurodegenerative diseases, we investigated the effects of PINK1 and DJ-1 on NMDAr function. Using protein overexpression and knockdown approaches, we showed that PINK1 increased NMDAr-mediated whole-cell currents by enhancing the function of NR2A-containing NMDAr subtype (NR2ACNR). However, DJ-1 decreased NMDAr-mediated currents, which was mediated through the inhibition of both NR2ACNR and NR2B-containing NMDAr subtype (NR2BCNR). We revealed that the knockdown of DJ-1 enhanced PTEN expression, which not only potentiated NR2BCNR function but also increased PINK1 expression that led to NR2ACNR potentiation. These results indicate that NMDAr function is differentially regulated by DJ-1-dependent signal pathways DJ-1/PTEN/NR2BCNR and DJ-1/PTEN/PINK1/NR2ACNR. Our results further showed that the suppression of DJ-1, while promoted NMDA-induced neuronal death through the overactivation of PTEN/NR2BCNR-dependent cell death pathway, induced a neuroprotective effect to counteract DJ-1 dysfunction-mediated neuronal death signaling through activating PTEN/PINK1/NR2ACNR cell survival–promoting pathway. Thus, PINK1 acts with DJ-1 in a common pathway to regulate NMDAr-mediated neuronal death. This study suggests that the DJ-1/PTEN/NR2BCNR and DJ-1/PTEN/PINK1/NR2ACNR pathways may represent potential therapeutic targets for the development of neuroprotection strategy in the treatment of brain injuries and neurodegenerative diseases such as Parkinson’s disease.

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