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Nasretdinov A, Vinokurova D, Lemale CL, Burkhanova-Zakirova G, Chernova K, Makarova J, Herreras O, Dreier JP, Khazipov R. Diversity of cortical activity changes beyond depression during Spreading Depolarizations. Nat Commun 2023; 14:7729. [PMID: 38007508 PMCID: PMC10676372 DOI: 10.1038/s41467-023-43509-3] [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: 03/22/2023] [Accepted: 11/10/2023] [Indexed: 11/27/2023] Open
Abstract
Spreading depolarizations (SDs) are classically thought to be associated with spreading depression of cortical activity. Here, we found that SDs in patients with subarachnoid hemorrhage produce variable, ranging from depression to booming, changes in electrocorticographic activity, especially in the delta frequency band. In rats, depression of activity was characteristic of high-potassium-induced full SDs, whereas partial superficial SDs caused either little change or a boom of activity at the cortical vertex, supported by volume conduction of signals from spared delta generators in the deep cortical layers. Partial SDs also caused moderate neuronal depolarization and sustained excitation, organized in gamma oscillations in a narrow sub-SD zone. Thus, our study challenges the concept of homology between spreading depolarization and spreading depression by showing that SDs produce variable, from depression to booming, changes in activity at the cortical surface and in different cortical layers depending on the depth of SD penetration.
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Affiliation(s)
- Azat Nasretdinov
- Laboratory of Neurobiology, Kazan Federal University, Kazan, 420008, Russia
| | - Daria Vinokurova
- Laboratory of Neurobiology, Kazan Federal University, Kazan, 420008, Russia
- INMED-INSERM, Aix-Marseille University, Marseille, 13273, France
| | - Coline L Lemale
- Centre for Stroke Research Berlin, Department of Experimental Neurology and Department of Neurology, Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, D-10117, Berlin, Germany
| | | | - Ksenia Chernova
- Laboratory of Neurobiology, Kazan Federal University, Kazan, 420008, Russia
| | - Julia Makarova
- Department of Translational Neuroscience, Cajal Institute-CSIC, Madrid, Spain
| | - Oscar Herreras
- Department of Translational Neuroscience, Cajal Institute-CSIC, Madrid, Spain
| | - Jens P Dreier
- Centre for Stroke Research Berlin, Department of Experimental Neurology and Department of Neurology, Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, D-10117, Berlin, Germany
- Bernstein Centre for Computational Neuroscience Berlin, D-10115, Berlin, Germany
- Einstein Centre for Neurosciences Berlin, D-10117, Berlin, Germany
| | - Roustem Khazipov
- Laboratory of Neurobiology, Kazan Federal University, Kazan, 420008, Russia.
- INMED-INSERM, Aix-Marseille University, Marseille, 13273, France.
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Mingazov B, Vinokurova D, Zakharov A, Khazipov R. Comparative Study of Terminal Cortical Potentials Using Iridium and Ag/AgCl Electrodes. Int J Mol Sci 2023; 24:10769. [PMID: 37445945 DOI: 10.3390/ijms241310769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 06/19/2023] [Accepted: 06/26/2023] [Indexed: 07/15/2023] Open
Abstract
Brain ischemia induces slow voltage shifts in the cerebral cortex, including waves of spreading depolarization (SD) and negative ultraslow potentials (NUPs), which are considered as brain injury markers. However, different electrode materials and locations yield variable SD and NUP features. Here, we compared terminal cortical events during isoflurane or sevoflurane euthanasia using intracortical linear iridium electrode arrays and Ag/AgCl-based electrodes in the rat somatosensory cortex. Inhalation of anesthetics caused respiratory arrest, associated with hyperpolarization and followed by SD and NUP on both Ir and Ag electrodes. Ag-NUPs were bell shaped and waned within half an hour after death. Ir-NUPs were biphasic, with the early fast phase corresponding to Ag-NUP, and the late absent on Ag electrodes, phase of a progressive depolarizing voltage shift reaching -100 mV by two hours after death. In addition, late Ir-NUPs were more ample in the deep layers than at the cortical surface. Thus, intracortical Ag and Ir electrodes reliably assess early manifestations of terminal brain injury including hyperpolarization, SD and the early phase of NUP, while the late, giant amplitude phase of NUP, which is present only on Ir electrodes, is probably related to the sensitivity of Ir electrodes to a yet unidentified factor related to brain death.
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Affiliation(s)
- Bulat Mingazov
- Laboratory of Neurobiology, Kazan Federal University, Kazan 420008, Russia
| | - Daria Vinokurova
- Laboratory of Neurobiology, Kazan Federal University, Kazan 420008, Russia
| | - Andrei Zakharov
- Laboratory of Neurobiology, Kazan Federal University, Kazan 420008, Russia
- Department of Physiology, Kazan State Medical University, Kazan 420012, Russia
| | - Roustem Khazipov
- Laboratory of Neurobiology, Kazan Federal University, Kazan 420008, Russia
- Institut de Neurobiologie de la Méditerranée (Inserm U1249), Aix-Marseille Université, 13273 Marseille, France
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Vinokurova D, Zakharov A, Chernova K, Burkhanova-Zakirova G, Horst V, Lemale CL, Dreier JP, Khazipov R. Depth-profile of impairments in endothelin-1 - induced focal cortical ischemia. J Cereb Blood Flow Metab 2022; 42:1944-1960. [PMID: 35702017 PMCID: PMC9536115 DOI: 10.1177/0271678x221107422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The development of ischemic lesions has primarily been studied in horizontal cortical space. However, how ischemic lesions develop through the cortical depth remains largely unknown. We explored this question using direct current coupled recordings at different cortical depths using linear arrays of iridium electrodes in the focal epipial endothelin-1 (ET1) ischemia model in the rat barrel cortex. ET1-induced impairments were characterized by a vertical gradient with (i) rapid suppression of the spontaneous activity in the superficial cortical layers at the onset of ischemia, (ii) compartmentalization of spreading depolarizations (SDs) to the deep layers during progression of ischemia, and (iii) deeper suppression of activity and larger histological lesion size in superficial cortical layers. The level of impairments correlated strongly with the rate of spontaneous activity suppression, the rate of SD onset after ET1 application, and the amplitude of giant negative ultraslow potentials (∼-70 mV), which developed during ET1 application and were similar to the tent-shaped ultraslow potentials observed during focal ischemia in the human cortex. Thus, in the epipial ET1 ischemia model, ischemic lesions develop progressively from the surface to the cortical depth, and early changes in electrical activity at the onset of ET1-induced ischemia reliably predict the severity of ischemic damage.
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Affiliation(s)
- Daria Vinokurova
- Laboratory of Neurobiology, Kazan Federal University, Kazan, Russia.,INMED, Aix-Marseille University, Marseille, France
| | - Andrey Zakharov
- Laboratory of Neurobiology, Kazan Federal University, Kazan, Russia.,Department of Physiology, Kazan State Medical University, Kazan, Russia
| | - Kseniya Chernova
- Laboratory of Neurobiology, Kazan Federal University, Kazan, Russia
| | | | - Viktor Horst
- Centre for Stroke Research Berlin, Department of Experimental Neurology and Department of Neurology, Charité Universitätsmedizin Berlin (Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health), Berlin, Germany
| | - Coline L Lemale
- Centre for Stroke Research Berlin, Department of Experimental Neurology and Department of Neurology, Charité Universitätsmedizin Berlin (Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health), Berlin, Germany
| | - Jens P Dreier
- Centre for Stroke Research Berlin, Department of Experimental Neurology and Department of Neurology, Charité Universitätsmedizin Berlin (Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health), Berlin, Germany.,Bernstein Centre for Computational Neuroscience Berlin, Berlin, Germany.,Einstein Centre for Neurosciences Berlin, Berlin, Germany
| | - Roustem Khazipov
- Laboratory of Neurobiology, Kazan Federal University, Kazan, Russia.,INMED, Aix-Marseille University, Marseille, France
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Lee S, Henry J, Tryba AK, Esengul Y, Warnke P, Wu S, van Drongelen W. Digital reconstruction of infraslow activity in human intracranial ictal recordings using a deconvolution-based inverse filter. Sci Rep 2022; 12:13701. [PMID: 35953580 PMCID: PMC9372169 DOI: 10.1038/s41598-022-18071-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 08/04/2022] [Indexed: 11/30/2022] Open
Abstract
Infraslow activity (ISA) is a biomarker that has recently become of interest in the characterization of seizure recordings. Recent data from a small number of studies have suggested that the epileptogenic zone may be identified by the presence of ISA. Investigation of low frequency activity in clinical seizure recordings, however, has been hampered by technical limitations. EEG systems necessarily include a high-pass filter early in the measurement chain to remove large artifactual drifts that can saturate recording elements such as the amplifier. This filter, unfortunately, attenuates legitimately seizure-related low frequencies, making ISA difficult to study in clinical EEG recordings. In this study, we present a deconvolution-based digital inverse filter that allows recovery of attenuated low frequency activity in intracranial recordings of temporal lobe epilepsy patients. First, we show that the unit impulse response (UIR) of an EEG system can be characterized by differentiation of the system's step response. As proof of method, we present several examples that show that the low frequency component of a high-pass filtered signal can be restored by deconvolution with the UIR. We then demonstrate that this method can be applied to biologically relevant signals including clinical EEG recordings obtained from seizure patients. Finally, we discuss how this method can be applied to study ISA to identify and assess the seizure onset zone.
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Affiliation(s)
- Somin Lee
- Medical Scientist Training Program, The University of Chicago, Chicago, IL, 60637, USA
- Committee on Neurobiology, The University of Chicago, Chicago, IL, 60637, USA
| | - Julia Henry
- Department of Pediatrics, The University of Chicago, Chicago, IL, 60637, USA
| | - Andrew K Tryba
- Department of Pediatrics, The University of Chicago, Chicago, IL, 60637, USA
| | - Yasar Esengul
- Department of Neurology, The University of Chicago, Chicago, IL, 60637, USA
| | - Peter Warnke
- Department of Neurosurgery, The University of Chicago, Chicago, IL, 60637, USA
| | - Shasha Wu
- Department of Neurology, The University of Chicago, Chicago, IL, 60637, USA
| | - Wim van Drongelen
- Committee on Neurobiology, The University of Chicago, Chicago, IL, 60637, USA.
- Department of Pediatrics, The University of Chicago, Chicago, IL, 60637, USA.
- Committee On Computational Neuroscience, The University of Chicago, Chicago, IL, 60637, USA.
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