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Farmer K, Abd-Elrahman KS, Derksen A, Rowe EM, Thompson AM, Rudyk CA, Prowse NA, Dwyer Z, Bureau SC, Fortin T, Ferguson SSG, Hayley S. mGluR5 Allosteric Modulation Promotes Neurorecovery in a 6-OHDA-Toxicant Model of Parkinson's Disease. Mol Neurobiol 2019; 57:1418-1431. [PMID: 31754998 DOI: 10.1007/s12035-019-01818-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Accepted: 10/14/2019] [Indexed: 10/25/2022]
Abstract
Parkinson's disease is a neurodegenerative disease characterized by a loss of dopaminergic substantia nigra neurons and depletion of dopamine. To date, current therapeutic approaches focus on managing motor symptoms and trying to slow neurodegeneration, with minimal capacity to promote neurorecovery. mGluR5 plays a key role in neuroplasticity, and altered mGluR5 signaling contributes to synucleinopathy and dyskinesia in patients with Parkinson's disease. Here, we tested whether the mGluR5-negative allosteric modulator, (2-chloro-4-[2[2,5-dimethyl-1-[4-(trifluoromethoxy) phenyl] imidazol-4-yl] ethynyl] pyridine (CTEP), would be effective in improving motor deficits and promoting neural recovery in a 6-hydroxydopamine (6-OHDA) mouse model. Lesions were induced by 6-ODHA striatal infusion, and 30 days later treatment with CTEP (2 mg/kg) or vehicle commenced for either 1 or 12 weeks. Animals were subjected to behavioral, pathological, and molecular analyses. We also assessed how long the effects of CTEP persisted, and finally, using rapamycin, determined the role of the mTOR pathway. CTEP treatment induced a duration-dependent improvement in apomorphine-induced rotation and performance on rotarod in lesioned mice. Moreover, CTEP promoted a recovery of striatal tyrosine hydroxylase-positive fibers and normalized FosB levels in lesioned mice. The beneficial effects of CTEP were paralleled by an activation of mammalian target of rapamycin (mTOR) pathway and elevated brain-derived neurotrophic factor levels in the striatum of lesioned mice. The mTOR inhibitor, rapamycin (sirolimus), abolished CTEP-induced neurorecovery and rescue of motor deficits. Our findings indicate that mTOR pathway is a useful target to promote recovery and that mGluR5 allosteric regulators may potentially be repurposed to selectively target this pathway to enhance neuroplasticity in patients with Parkinson's disease.
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Affiliation(s)
- Kyle Farmer
- Department of Neuroscience, Carleton University, Ottawa, Ontario, K1S 5B6, Canada
| | - Khaled S Abd-Elrahman
- University of Ottawa Brain and Mind Institute, Ottawa, Ontario, K1H 8M5, Canada.,Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Ontario, K1H 8M5, Canada
| | - Alexa Derksen
- Department of Neuroscience, Carleton University, Ottawa, Ontario, K1S 5B6, Canada
| | - Elyn M Rowe
- Department of Neuroscience, Carleton University, Ottawa, Ontario, K1S 5B6, Canada
| | - Ashley M Thompson
- Department of Neuroscience, Carleton University, Ottawa, Ontario, K1S 5B6, Canada
| | - Christopher A Rudyk
- Department of Neuroscience, Carleton University, Ottawa, Ontario, K1S 5B6, Canada
| | - Natalie A Prowse
- Department of Neuroscience, Carleton University, Ottawa, Ontario, K1S 5B6, Canada
| | - Zachary Dwyer
- Department of Neuroscience, Carleton University, Ottawa, Ontario, K1S 5B6, Canada
| | - Samantha C Bureau
- Department of Neuroscience, Carleton University, Ottawa, Ontario, K1S 5B6, Canada
| | - Teresa Fortin
- Department of Neuroscience, Carleton University, Ottawa, Ontario, K1S 5B6, Canada
| | - Stephen S G Ferguson
- University of Ottawa Brain and Mind Institute, Ottawa, Ontario, K1H 8M5, Canada.,Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Ontario, K1H 8M5, Canada
| | - Shawn Hayley
- Department of Neuroscience, Carleton University, Ottawa, Ontario, K1S 5B6, Canada.
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Cisbani G, Drouin-Ouellet J, Gibrat C, Saint-Pierre M, Lagacé M, Badrinarayanan S, Lavallée-Bourget M, Charest J, Chabrat A, Boivin L, Lebel M, Bousquet M, Lévesque M, Cicchetti F. Cystamine/cysteamine rescues the dopaminergic system and shows neurorestorative properties in an animal model of Parkinson's disease. Neurobiol Dis 2015; 82:430-444. [DOI: 10.1016/j.nbd.2015.07.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Revised: 07/08/2015] [Accepted: 07/22/2015] [Indexed: 12/22/2022] Open
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Goldberg NR, Fields V, Pflibsen L, Salvatore MF, Meshul CK. Social enrichment attenuates nigrostriatal lesioning and reverses motor impairment in a progressive 1-methyl-2-phenyl-1,2,3,6-tetrahydropyridine (MPTP) mouse model of Parkinson's disease. Neurobiol Dis 2012; 45:1051-67. [DOI: 10.1016/j.nbd.2011.12.024] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Revised: 10/29/2011] [Accepted: 12/04/2011] [Indexed: 11/29/2022] Open
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