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Belloso-Iguerategui A, Zamarbide M, Merino-Galan L, Rodríguez-Chinchilla T, Gago B, Santamaria E, Fernández-Irigoyen J, Cotman CW, Prieto GA, Quiroga-Varela A, Rodríguez-Oroz MC. Hippocampal synaptic failure is an early event in experimental parkinsonism with subtle cognitive deficit. Brain 2023; 146:4949-4963. [PMID: 37403195 PMCID: PMC10690043 DOI: 10.1093/brain/awad227] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 05/25/2023] [Accepted: 06/20/2023] [Indexed: 07/06/2023] Open
Abstract
Learning and memory mainly rely on correct synaptic function in the hippocampus and other brain regions. In Parkinson's disease, subtle cognitive deficits may even precede motor signs early in the disease. Hence, we set out to unravel the earliest hippocampal synaptic alterations associated with human α-synuclein overexpression prior to and soon after the appearance of cognitive deficits in a parkinsonism model. We bilaterally injected adeno-associated viral vectors encoding A53T-mutated human α-synuclein into the substantia nigra of rats, and evaluated them 1, 2, 4 and 16 weeks post-inoculation by immunohistochemistry and immunofluorescence to study degeneration and distribution of α-synuclein in the midbrain and hippocampus. The object location test was used to evaluate hippocampal-dependent memory. Sequential window acquisition of all theoretical mass spectrometry-based proteomics and fluorescence analysis of single-synapse long-term potentiation were used to study alterations to protein composition and plasticity in isolated hippocampal synapses. The effect of L-DOPA and pramipexole on long-term potentiation was also tested. Human α-synuclein was found within dopaminergic and glutamatergic neurons of the ventral tegmental area, and in dopaminergic, glutamatergic and GABAergic axon terminals in the hippocampus from 1 week post-inoculation, concomitant with mild dopaminergic degeneration in the ventral tegmental area. In the hippocampus, differential expression of proteins involved in synaptic vesicle cycling, neurotransmitter release and receptor trafficking, together with impaired long-term potentiation were the first events observed (1 week post-inoculation), preceding cognitive deficits (4 weeks post-inoculation). Later on, at 16 weeks post-inoculation, there was a deregulation of proteins involved in synaptic function, particularly those involved in the regulation of membrane potential, ion balance and receptor signalling. Hippocampal long-term potentiation was impaired before and soon after the onset of cognitive deficits, at 1 and 4 weeks post-inoculation, respectively. L-DOPA recovered hippocampal long-term potentiation more efficiently at 4 weeks post-inoculation than pramipexole, which partially rescued it at both time points. Overall, we found impaired synaptic plasticity and proteome dysregulation at hippocampal terminals to be the first events that contribute to the development of cognitive deficits in experimental parkinsonism. Our results not only point to dopaminergic but also to glutamatergic and GABAergic dysfunction, highlighting the relevance of the three neurotransmitter systems in the ventral tegmental area-hippocampus interaction from the earliest stages of parkinsonism. The proteins identified in the current work may constitute potential biomarkers of early synaptic damage in the hippocampus and hence, therapies targeting these could potentially restore early synaptic malfunction and consequently, cognitive deficits in Parkinson's disease.
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Affiliation(s)
| | - Marta Zamarbide
- Neuroscience Program, Center for Applied Medical Research (CIMA), Universidad de Navarra, 31008 Pamplona, Spain
| | - Leyre Merino-Galan
- Neuroscience Program, Center for Applied Medical Research (CIMA), Universidad de Navarra, 31008 Pamplona, Spain
- Neuroscience Department, University of the Basque Country (UPV/EHU), 48940 Leioa, Spain
| | | | - Belén Gago
- Faculty of Medicine, IBIMA Plataforma BIONAND, Universidad de Málaga, 29016 Málaga, Spain
| | - Enrique Santamaria
- Clinical Neuroproteomics Unit, Proteomics Platform, Proteored-ISCIII, Navarrabiomed, Complejo Hospitalario de Navarra (CHN), Universidad Pública de Navarra (UPNA), 31008 Pamplona, Spain
- Neurosciences and Mental Health Area, Navarra Institute for Health Research (IdiSNA), 31008 Pamplona, Spain
| | - Joaquín Fernández-Irigoyen
- Clinical Neuroproteomics Unit, Proteomics Platform, Proteored-ISCIII, Navarrabiomed, Complejo Hospitalario de Navarra (CHN), Universidad Pública de Navarra (UPNA), 31008 Pamplona, Spain
- Neurosciences and Mental Health Area, Navarra Institute for Health Research (IdiSNA), 31008 Pamplona, Spain
| | - Carl W Cotman
- Institute for Memory Impairments and Neurological Disorders, University of California-Irvine, Irvine, CA 92697, USA
| | - G Aleph Prieto
- Institute for Memory Impairments and Neurological Disorders, University of California-Irvine, Irvine, CA 92697, USA
- Instituto de Neurobiología, Universidad Nacional Autónoma de México, 76010 Querétaro, México
| | - Ana Quiroga-Varela
- Neuroscience Program, Center for Applied Medical Research (CIMA), Universidad de Navarra, 31008 Pamplona, Spain
- Neurosciences and Mental Health Area, Navarra Institute for Health Research (IdiSNA), 31008 Pamplona, Spain
| | - María Cruz Rodríguez-Oroz
- Neuroscience Program, Center for Applied Medical Research (CIMA), Universidad de Navarra, 31008 Pamplona, Spain
- Neurosciences and Mental Health Area, Navarra Institute for Health Research (IdiSNA), 31008 Pamplona, Spain
- Neurology Department, Clínica Universidad de Navarra (CUN), 31008 Pamplona, Spain
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Merino-Galan L, Jimenez-Urbieta H, Zamarbide M, Rodríguez-Chinchilla T, Belloso-Iguerategui A, Santamaria E, Fernández-Irigoyen J, Aiastui A, Doudnikoff E, Bézard E, Ouro A, Knafo S, Gago B, Quiroga-Varela A, Rodríguez-Oroz MC. Striatal synaptic bioenergetic and autophagic decline in premotor experimental parkinsonism. Brain 2022; 145:2092-2107. [PMID: 35245368 PMCID: PMC9460676 DOI: 10.1093/brain/awac087] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 01/31/2022] [Accepted: 02/20/2022] [Indexed: 12/02/2022] Open
Abstract
Synaptic impairment might precede neuronal degeneration in Parkinson’s disease. However, the intimate mechanisms altering synaptic function by the accumulation of presynaptic α-synuclein in striatal dopaminergic terminals before dopaminergic death occurs, have not been elucidated. Our aim is to unravel the sequence of synaptic functional and structural changes preceding symptomatic dopaminergic cell death. As such, we evaluated the temporal sequence of functional and structural changes at striatal synapses before parkinsonian motor features appear in a rat model of progressive dopaminergic death induced by overexpression of the human mutated A53T α-synuclein in the substantia nigra pars compacta, a protein transported to these synapses. Sequential window acquisition of all theoretical mass spectra proteomics identified deregulated proteins involved first in energy metabolism and later, in vesicle cycling and autophagy. After protein deregulation and when α-synuclein accumulated at striatal synapses, alterations to mitochondrial bioenergetics were observed using a Seahorse XF96 analyser. Sustained dysfunctional mitochondrial bioenergetics was followed by a decrease in the number of dopaminergic terminals, morphological and ultrastructural alterations, and an abnormal accumulation of autophagic/endocytic vesicles inside the remaining dopaminergic fibres was evident by electron microscopy. The total mitochondrial population remained unchanged whereas the number of ultrastructurally damaged mitochondria increases as the pathological process evolved. We also observed ultrastructural signs of plasticity within glutamatergic synapses before the expression of motor abnormalities, such as a reduction in axospinous synapses and an increase in perforated postsynaptic densities. Overall, we found that a synaptic energetic failure and accumulation of dysfunctional organelles occur sequentially at the dopaminergic terminals as the earliest events preceding structural changes and cell death. We also identify key proteins involved in these earliest functional abnormalities that may be modulated and serve as therapeutic targets to counterbalance the degeneration of dopaminergic cells to delay or prevent the development of Parkinson’s disease.
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Affiliation(s)
- Leyre Merino-Galan
- Neuroscience Program, Center for Applied Medical Research (CIMA), Universidad de Navarra, 31008 Pamplona, Spain.,Neuroscience Department, University of the Basque Country (UPV/EHU), 48940 Leioa, Spain
| | - Haritz Jimenez-Urbieta
- Cell culture Platform, Biodonostia Health Research Institute, San Sebastian, 20014 Donostia, Spain
| | - Marta Zamarbide
- Neuroscience Program, Center for Applied Medical Research (CIMA), Universidad de Navarra, 31008 Pamplona, Spain
| | | | | | - Enrique Santamaria
- Clinical Neuroproteomics Unit, Proteomics Platform, Proteored-ISCIII, Navarrabiomed, Complejo Hospitalario de Navarra (CHN), Universidad Pública de Navarra (UPNA), 31008 Pamplona, Spain.,Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
| | - Joaquín Fernández-Irigoyen
- Clinical Neuroproteomics Unit, Proteomics Platform, Proteored-ISCIII, Navarrabiomed, Complejo Hospitalario de Navarra (CHN), Universidad Pública de Navarra (UPNA), 31008 Pamplona, Spain.,Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
| | - Ana Aiastui
- Cell culture Platform, Biodonostia Health Research Institute, San Sebastian, 20014 Donostia, Spain
| | - Evelyne Doudnikoff
- CNRS, Institut des Maladies Neurodégénératives, UMR 5293, 33076 Bordeaux, France
| | - Erwan Bézard
- CNRS, Institut des Maladies Neurodégénératives, UMR 5293, 33076 Bordeaux, France
| | - Alberto Ouro
- Clinical Neurosciences Research Laboratories, Health Research Institute of Santiago de Compostela (IDIS), 15706 Santiago de Compostela, Spain
| | - Shira Knafo
- Department of Physiology and Cell Biology, Faculty of Health Sciences, The National Institute for Biotechnology in the Negev, and The Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, 8410501 Beer-Sheva, Israel.,Instituto Biofisika (UPV/EHU, CSIC), University of the Basque Country, Basque Foundation for Science, IKERBASQUE, 48940 Leioa, Spain
| | - Belén Gago
- Faculty of Medicine, Instituto de Investigación Biomédica de Málaga, Universidad de Málaga, 29016 Málaga, Spain
| | - Ana Quiroga-Varela
- Neuroscience Program, Center for Applied Medical Research (CIMA), Universidad de Navarra, 31008 Pamplona, Spain.,Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
| | - María Cruz Rodríguez-Oroz
- Neuroscience Program, Center for Applied Medical Research (CIMA), Universidad de Navarra, 31008 Pamplona, Spain.,Navarra Institute for Health Research (IdiSNA), Pamplona, Spain.,Neurology Department, Clínica Universidad de Navarra (CUN), 31008 Pamplona, Spain
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Jiménez-Urbieta H, Gago B, Quiroga-Varela A, Rodríguez-Chinchilla T, Merino-Galán L, Delgado-Alvarado M, Navalpotro-Gómez I, Belloso-Iguerategui A, Marin C, Rodríguez-Oroz MC. Correction to: Motor impulsivity and delay intolerance are elicited in a dose-dependent manner with a dopaminergic agonist in parkinsonian rats. Psychopharmacology (Berl) 2020; 237:2433-2434. [PMID: 32617648 DOI: 10.1007/s00213-020-05594-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
In the original version of this article, the Figure 3 was published in an incorrect format, even though the data and the related information in the text are correct.
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Affiliation(s)
| | - Belén Gago
- Instituto de Investigación Biomédica de Málaga, Facultad de Medicina, Universidad de Málaga, Málaga, Spain
| | - Ana Quiroga-Varela
- Centro de Investigación Médica Aplicada (CIMA), Universidad de Navarra, Pamplona, Spain
| | | | - Leyre Merino-Galán
- Centro de Investigación Médica Aplicada (CIMA), Universidad de Navarra, Pamplona, Spain
- University of the Basque Country (UPV/EHU), Leioa, Spain
| | - Manuel Delgado-Alvarado
- Neurology Department, Sierrallana Hospital, Torrelavega, Spain
- Psychiatry Research Area, IDIVAL, University HospitalMarqués de Valdecilla, Santander, Spain
- Biomedical Research Networking Center for Mental Health (CIBERSAM), Madrid, Spain
| | | | | | - Concepció Marin
- IRCE, Institut d' investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - María C Rodríguez-Oroz
- Centro de Investigación Médica Aplicada (CIMA), Universidad de Navarra, Pamplona, Spain.
- Ikerbasque Foundation, Bilbao, Spain.
- Basque Center on Cognition, Brain and Language (BCBL), San Sebastián, Spain.
- Servicio de Neurología, Clínica Universidad de Navarra, Pamplona, Spain.
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Jiménez-Urbieta H, Gago B, Quiroga-Varela A, Rodríguez-Chinchilla T, Merino-Galán L, Delgado-Alvarado M, Navalpotro-Gómez I, Belloso-Iguerategui A, Marin C, Rodríguez-Oroz MC. Motor impulsivity and delay intolerance are elicited in a dose-dependent manner with a dopaminergic agonist in parkinsonian rats. Psychopharmacology (Berl) 2020; 237:2419-2431. [PMID: 32440779 DOI: 10.1007/s00213-020-05544-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 04/30/2020] [Indexed: 10/24/2022]
Abstract
RATIONALE Impulse control disorders (ICD) and other impulsive-compulsive behaviours are frequently found in Parkinson's disease (PD) patients treated with dopaminergic agonists. To date, there are no available animal models to investigate their pathophysiology and determine whether they can be elicited by varying doses of dopaminergic drugs. In addition, there is some controversy regarding the predispositional pattern of striatal dopaminergic depletion. OBJECTIVES To study the effect of two doses of pramipexole (PPX) on motor impulsivity, delay intolerance and compulsive-like behaviour. METHODS Male rats with mild dopaminergic denervation in the dorsolateral striatum (bilateral injections of 6-hydroxidopamine (6-OHDA)) treated with two doses of PPX (0.25 mg/kg and 3 mg/kg) and tested in the variable delay-to-signal paradigm. RESULTS Partial (50%) dopaminergic depletion did not induce significant changes in motor impulsivity or delay intolerance. However, 0.25 mg/kg of PPX increased motor impulsivity, while 3 mg/kg of PPX increased both motor impulsivity and delay intolerance. These effects were independent of the drug's antiparkinsonian effects. Importantly, impulsivity scores before and after dopaminergic lesion were positively associated with the impulsivity observed after administering 3 mg/kg of PPX. No compulsive-like behaviour was induced by PPX administration. CONCLUSIONS We described a rat model, with a moderate dorsolateral dopaminergic lesion resembling that suffered by patients with early PD, that develops different types of impulsivity in a dose-dependent manner dissociated from motor benefits when treated with PPX. This model recapitulates key features of abnormal impulsivity in PD and may be useful for deepening our understanding of the pathophysiology of ICD.
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Affiliation(s)
| | - Belén Gago
- Instituto de Investigación Biomédica de Málaga, Facultad de Medicina, Universidad de Málaga, Málaga, Spain
| | - Ana Quiroga-Varela
- Centro de Investigación Médica Aplicada (CIMA), Universidad de Navarra, Pamplona, Spain
| | | | - Leyre Merino-Galán
- Centro de Investigación Médica Aplicada (CIMA), Universidad de Navarra, Pamplona, Spain.,University of the Basque Country (UPV/EHU), Leioa, Spain
| | - Manuel Delgado-Alvarado
- Neurology Department, Sierrallana Hospital, Torrelavega, Spain.,Psychiatry Research Area, IDIVAL, University Hospital Marqués de Valdecilla, Santander, Spain.,Biomedical Research Networking Center for Mental Health (CIBERSAM), Madrid, Spain
| | | | | | - Concepció Marin
- IRCE, Institut d' investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - María C Rodríguez-Oroz
- Centro de Investigación Médica Aplicada (CIMA), Universidad de Navarra, Pamplona, Spain. .,Ikerbasque Foundation, Bilbao, Spain. .,Basque Center on Cognition, Brain and Language (BCBL), San Sebastián, Spain. .,Servicio de Neurología, Clínica Universidad de Navarra, Pamplona, Spain.
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