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Zhou ZD, Xie SP, Sathiyamoorthy S, Saw WT, Sing TY, Ng SH, Chua HPH, Tang AMY, Shaffra F, Li Z, Wang H, Ho PGH, Lai MKP, Angeles DC, Lim TM, Tan EK. F-box protein 7 mutations promote protein aggregation in mitochondria and inhibit mitophagy. Hum Mol Genet 2015; 24:6314-30. [PMID: 26310625 DOI: 10.1093/hmg/ddv340] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Accepted: 08/17/2015] [Indexed: 11/14/2022] Open
Abstract
The mutations of F-box protein 7 (FBXO7) gene (T22M, R378G and R498X) are associated with a severe form of autosomal recessive juvenile-onset Parkinson's disease (PD) (PARK 15). Here we demonstrated that wild-type (WT) FBXO7 is a stress response protein and it can play both cytoprotective and neurotoxic roles. The WT FBXO7 protein is vital to cell mitophagy and can facilitate mitophagy to protect cells, whereas mutant FBXO7 inhibits mitophagy. Upon stress, the endogenous WT FBXO7 gets up-regulated, concentrates into mitochondria and forms FBXO7 aggregates in mitochondria. However, FBXO7 mutations aggravate deleterious FBXO7 aggregation in mitochondria. The FBXO7 aggregation and toxicity can be alleviated by Proline, glutathione (GSH) and coenzyme Q10, whereas deleterious FBXO7 aggregation in mitochondria can be aggravated by prohibitin 1 (PHB1), a mitochondrial protease inhibitor. The overexpression of WT FBXO7 could lead to FBXO7 protein aggregation and dopamine neuron degeneration in transgenic Drosophila heads. The elevated FBXO7 expression and aggregation were identified in human fibroblast cells from PD patients. FBXO7 can also form aggregates in brains of PD and Alzheimer's disease. Our study provides novel pathophysiologic insights and suggests that FBXO7 may be a potential therapeutic target in FBXO7-linked neuron degeneration in PD.
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Affiliation(s)
- Zhi Dong Zhou
- National Neuroscience Institute of Singapore, 11 Jalan Tan Tock Seng, Singapore, Singapore, Signature Research Program in Neuroscience and Behavioral Disorders, Duke-NUS Graduate Medical School Singapore, 8 College Road, Singapore, Singapore
| | - Shao Ping Xie
- National Neuroscience Institute of Singapore, 11 Jalan Tan Tock Seng, Singapore, Singapore
| | | | - Wuan Ting Saw
- National Neuroscience Institute of Singapore, 11 Jalan Tan Tock Seng, Singapore, Singapore
| | - Tan Ye Sing
- National Neuroscience Institute of Singapore, 11 Jalan Tan Tock Seng, Singapore, Singapore
| | - Shin Hui Ng
- National Neuroscience Institute of Singapore, 11 Jalan Tan Tock Seng, Singapore, Singapore
| | - Heidi Pek Hup Chua
- National Neuroscience Institute of Singapore, 11 Jalan Tan Tock Seng, Singapore, Singapore
| | - Alyssa Mei Yan Tang
- National Neuroscience Institute of Singapore, 11 Jalan Tan Tock Seng, Singapore, Singapore
| | - Fathima Shaffra
- National Neuroscience Institute of Singapore, 11 Jalan Tan Tock Seng, Singapore, Singapore
| | - Zeng Li
- National Neuroscience Institute of Singapore, 11 Jalan Tan Tock Seng, Singapore, Singapore
| | - Hongyan Wang
- Signature Research Program in Neuroscience and Behavioral Disorders, Duke-NUS Graduate Medical School Singapore, 8 College Road, Singapore, Singapore
| | - Patrick Ghim Hoe Ho
- National Neuroscience Institute of Singapore, 11 Jalan Tan Tock Seng, Singapore, Singapore
| | - Mitchell Kim Peng Lai
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Dario C Angeles
- Department of Neurology, Singapore General Hospital, Outram Road, Singapore, Singapore and
| | - Tit Meng Lim
- Department of Biological Science, National University of Singapore, 14 Science Drive 4, Singapore, Singapore
| | - Eng-King Tan
- National Neuroscience Institute of Singapore, 11 Jalan Tan Tock Seng, Singapore, Singapore, Signature Research Program in Neuroscience and Behavioral Disorders, Duke-NUS Graduate Medical School Singapore, 8 College Road, Singapore, Singapore, Department of Neurology, Singapore General Hospital, Outram Road, Singapore, Singapore and
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