1
|
Vergaelen M, Manzella S, Vonck K, Craey E, Spanoghe J, Sprengers M, Carrette E, Wadman WJ, Delbeke J, Boon P, Larsen LE, Raedt R. Increased Dentate Gyrus Excitability in the Intrahippocampal Kainic Acid Mouse Model for Temporal Lobe Epilepsy. Int J Mol Sci 2024; 25:660. [PMID: 38203829 PMCID: PMC10779277 DOI: 10.3390/ijms25010660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 12/29/2023] [Accepted: 01/02/2024] [Indexed: 01/12/2024] Open
Abstract
The intrahippocampal kainic acid (IHKA) mouse model is an extensively used in vivo model to investigate the pathophysiology of mesial temporal lobe epilepsy (mTLE) and to develop novel therapies for drug-resistant epilepsy. It is characterized by profound hippocampal sclerosis and spontaneously occurring seizures with a major role for the injected damaged hippocampus, but little is known about the excitability of specific subregions. The purpose of this study was to electrophysiologically characterize the excitability of hippocampal subregions in the chronic phase of the induced epilepsy in the IHKA mouse model. We recorded field postsynaptic potentials (fPSPs) after electrical stimulation in the CA1 region and in the dentate gyrus (DG) of hippocampal slices of IHKA and healthy mice using a multielectrode array (MEA). In the DG, a significantly steeper fPSP slope was found, reflecting higher synaptic strength. Population spikes were more prevalent with a larger spatial distribution in the IHKA group, reflecting a higher degree of granule cell output. Only minor differences were found in the CA1 region. These results point to increased neuronal excitability in the DG but not in the CA1 region of the hippocampus of IHKA mice. This method, in which the excitability of hippocampal slices from IHKA mice is investigated using a MEA, can now be further explored as a potential new model to screen for new interventions that can restore DG function and potentially lead to novel therapies for mTLE.
Collapse
Affiliation(s)
- Marijke Vergaelen
- 4BRAIN, Department of Head and Skin, Ghent University, 9000 Ghent, Belgium
| | - Simona Manzella
- 4BRAIN, Department of Head and Skin, Ghent University, 9000 Ghent, Belgium
| | - Kristl Vonck
- 4BRAIN, Department of Head and Skin, Ghent University, 9000 Ghent, Belgium
| | - Erine Craey
- 4BRAIN, Department of Head and Skin, Ghent University, 9000 Ghent, Belgium
| | - Jeroen Spanoghe
- 4BRAIN, Department of Head and Skin, Ghent University, 9000 Ghent, Belgium
| | - Mathieu Sprengers
- 4BRAIN, Department of Head and Skin, Ghent University, 9000 Ghent, Belgium
| | - Evelien Carrette
- 4BRAIN, Department of Head and Skin, Ghent University, 9000 Ghent, Belgium
| | - Wytse Jan Wadman
- 4BRAIN, Department of Head and Skin, Ghent University, 9000 Ghent, Belgium
| | - Jean Delbeke
- 4BRAIN, Department of Head and Skin, Ghent University, 9000 Ghent, Belgium
| | - Paul Boon
- 4BRAIN, Department of Head and Skin, Ghent University, 9000 Ghent, Belgium
| | - Lars Emil Larsen
- 4BRAIN, Department of Head and Skin, Ghent University, 9000 Ghent, Belgium
- MEDISIP, Department of Electronics and Information Systems, Ghent University, 9000 Ghent, Belgium
| | - Robrecht Raedt
- 4BRAIN, Department of Head and Skin, Ghent University, 9000 Ghent, Belgium
| |
Collapse
|
2
|
Graïc JM, Finos L, Vadori V, Cozzi B, Luisetto R, Gerussi T, M G, Doria A, Grisan E, Corain L, Peruffo A. Cytoarchitectureal changes in hippocampal subregions of the NZB/W F1 mouse model of lupus. Brain Behav Immun Health 2023; 32:100662. [PMID: 37456623 PMCID: PMC10339121 DOI: 10.1016/j.bbih.2023.100662] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 06/20/2023] [Accepted: 06/23/2023] [Indexed: 07/18/2023] Open
Abstract
Over 50% of clinical patients affected by the systemic lupus erythematosus disease display impaired neurological cognitive functions and psychiatric disorders, a form called neuropsychiatric systemic lupus erythematosus. Hippocampus is one of the brain structures most sensitive to the cognitive deficits and psychiatric disorders related to neuropsychiatric lupus. The purpose of this study was to compare, layer by layer, neuron morphology in lupus mice model NZB/W F1 versus Wild Type mice. By a morphometric of cells identified on Nissl-stained sections, we evaluated structural alterations between NZB/W F1 and Wild Type mice in seven hippocampal subregions: Molecular dentate gyrus, Granular dentate gyrus, Polymorph dentate gyrus, Oriens layer, Pyramidal layer, Radiatum layer and Lacunosum molecular layer. By principal component analysis we distinguished healthy Wild Type from NZB/W F1 mice. In NZB/W F1 mice hippocampal cytoarchitecture, the neuronal cells resulted larger in size and more regular than those of Wild Type. In NZB/W F1, neurons were usually denser than in WT. The Pyramidal layer neurons were much denser in Wild Type than in NZB/W F1. Application of principal component analysis, allowed to distinguish NZB/W F1 lupus mice from healthy, showing as NZBW subjects presented a scattered distribution and intrasubject variability. Our results show a hypertrophy of the NZB/W F1 hippocampal neurons associated with an increase in perikaryal size within the CA1, CA2, CA3 region and the DG. These results help advance our understanding on hippocampal organization and structure in the NZB/W F1 lupus model, suggesting the hypothesis that the different subregions could be differentially affected in neuropsychiatric systemic lupus erythematosus disease. Leveraging an in-depth analysis of the morphology of neural cells in the hippocampal subregions and applying dimensionality reduction using PCA, we propose an efficient methodology to distinguish pathological NZBW mice from WT mice."
Collapse
Affiliation(s)
- J.-M. Graïc
- Department of Comparative Biomedicine and Food Science, University of Padova, 35020, Italy
| | - L. Finos
- Department of Statistical Sciences, University of Padova, Padova, 35100, Italy
| | - V. Vadori
- School of Engineering, London South Bank University, London, SE1 0AA, UK
| | - B. Cozzi
- Department of Comparative Biomedicine and Food Science, University of Padova, 35020, Italy
| | - R. Luisetto
- Department of Surgery, Oncology and Gastroenterology, University of Padova, Padova, 35100, Italy
| | - T. Gerussi
- Department of Comparative Biomedicine and Food Science, University of Padova, 35020, Italy
| | - Gatto M
- Rheumatology Unit, Department of Medicine (DIMED), University of Padova, Padova, 35100, Italy
| | - A. Doria
- Rheumatology Unit, Department of Medicine (DIMED), University of Padova, Padova, 35100, Italy
| | - E. Grisan
- School of Engineering, London South Bank University, London, SE1 0AA, UK
| | - L. Corain
- Department of Management and Engineering, University of Padova, Vicenza, 36100, Italy
| | - A. Peruffo
- Department of Comparative Biomedicine and Food Science, University of Padova, 35020, Italy
| |
Collapse
|
3
|
Hu D, Guo Y, Wu M, Ma Y, Jing W. Manuscript Title: GDAP2 overexpression affects the development of neurons and dysregulates neuronal excitatory synaptic transmission. Neuroscience 2022; 488:32-43. [DOI: 10.1016/j.neuroscience.2022.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 02/01/2022] [Accepted: 02/07/2022] [Indexed: 11/28/2022]
|