Age-related changes in spreading depolarization during generalized epileptiform activity induced by flurothyl
- Authors: Zakirova G.F.1, Chernova К.A.1, Vinokurova D.E.1, Khazipov R.N.1,2, Zakharov А.V.1,3
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Affiliations:
- Kazan Federal University
- Aix-Marseille University
- Kazan State Medical University
- Issue: Vol 111, No 3 (2025)
- Pages: 484-495
- Section: EXPERIMENTAL ARTICLES
- URL: https://journals.rcsi.science/0869-8139/article/view/293623
- DOI: https://doi.org/10.31857/S0869813925030073
- EDN: https://elibrary.ru/UGRQZB
- ID: 293623
Cite item
Abstract
Spreading depolarizations (SDs) often accompany epileptiform discharges and participate in their termination. However, the factors that determine the occurrence of SD during epileptic seizures remain poorly understood. In this study, we investigated the influence of age on this phenomenon by performing multichannel intracortical recordings of electrical signals at different depths of the somatosensory cortex in rats during generalized epileptic discharges induced by flurothyl inhalation. We found that in juvenile rats (1–2 months old), SD frequently accompanied flurothyl-induced seizures, occurring in almost half of the cases. In contrast, SD events were much less frequent in immature rats (less than 3 weeks old) and adult rats (older than 3 months). In all age groups, SD originated in the superficial cortical layers and propagated downward into deeper layers. However, the depth of SD penetration was also age dependent: SDs spread deeper in juvenile rats compared to immature and adult animals. Thus, the propensity for SD during flurothyl-induced seizures follows a bell-shaped age profile, with the highest frequency and deepest propagation observed in juvenile animals. These findings underscore age as a critical determinant of the occurrence and characteristics of SD during epileptiform activity in the cortex.
About the authors
G. F. Zakirova
Kazan Federal University
Email: roustem.khazipov@inserm.fr
Russian Federation, Kazan
К. A. Chernova
Kazan Federal University
Email: roustem.khazipov@inserm.fr
Russian Federation, Kazan
D. E. Vinokurova
Kazan Federal University
Email: roustem.khazipov@inserm.fr
Russian Federation, Kazan
R. N. Khazipov
Kazan Federal University; Aix-Marseille University
Author for correspondence.
Email: roustem.khazipov@inserm.fr
INMED, IINSERM
Russian Federation, Kazan; Marseille, FranceА. V. Zakharov
Kazan Federal University; Kazan State Medical University
Email: roustem.khazipov@inserm.fr
Department of Normal Physiology
Russian Federation, Kazan; KazanReferences
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