Blondiaux, Armand;
Jia, Shaobo;
Annamneedi, Anil;
Çalışkan, Gürsel;
Nebel, Jana;
Montenegro-Venegas, Carolina;
Wykes, Robert C;
... Seidenbecher, Constanze I; + view all
(2023)
Linking epileptic phenotypes and neural extracellular matrix remodeling signatures in mouse models of epilepsy.
Neurobiology of Disease
, 188
, Article 106324. 10.1016/j.nbd.2023.106324.
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Abstract
Epilepsies are multifaceted neurological disorders characterized by abnormal brain activity, e.g. caused by imbalanced synaptic excitation and inhibition. The neural extracellular matrix (ECM) is dynamically modulated by physiological and pathophysiological activity and critically involved in controlling the brain's excitability. We used different epilepsy models, i.e. mice lacking the presynaptic scaffolding protein Bassoon at excitatory, inhibitory or all synapse types as genetic models for rapidly generalizing early-onset epilepsy, and intra-hippocampal kainate injection, a model for acquired temporal lobe epilepsy, to study the relationship between epileptic seizures and ECM composition. Electroencephalogram recordings revealed Bassoon deletion at excitatory or inhibitory synapses having diverse effects on epilepsy-related phenotypes. While constitutive Bsn mutants and to a lesser extent GABAergic neuron-specific knockouts (BsnDlx5/6cKO) displayed severe epilepsy with more and stronger seizures than kainate-injected animals, mutants lacking Bassoon solely in excitatory forebrain neurons (BsnEmx1cKO) showed only mild impairments. By semiquantitative immunoblotting and immunohistochemistry we show model-specific patterns of neural ECM remodeling, and we also demonstrate significant upregulation of the ECM receptor CD44 in null and BsnDlx5/6cKO mutants. ECM-associated WFA-binding chondroitin sulfates were strongly augmented in seizure models. Strikingly, Brevican, Neurocan, Aggrecan and link proteins Hapln1 and Hapln4 levels reliably predicted seizure properties across models, suggesting a link between ECM state and epileptic phenotype.
| Type: | Article |
|---|---|
| Title: | Linking epileptic phenotypes and neural extracellular matrix remodeling signatures in mouse models of epilepsy |
| Location: | United States |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.nbd.2023.106324 |
| Publisher version: | https://doi.org/10.1016/j.nbd.2023.106324 |
| Language: | English |
| Additional information: | © 2023 Published by Elsevier Inc. under a Creative Commons license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
| Keywords: | Bassoon (Bsn) mouse mutants, Brevican, CD44, Hapln4, Intra-hippocampal kainate model, Wisteria floribunda agglutinin (WFA) |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Clinical and Experimental Epilepsy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10179222 |
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