AI Article Synopsis
- The study aims to identify brain circuits involved in neonatal hypoxic-ischemic seizures using EEG, behavioral analysis, and whole-brain activity mapping.
- The researchers exposed mice to hypoxia and ischemia, recorded their brain activity, and tagged active neurons to image and analyze them later.
- Results showed that the seizures displayed specific EEG patterns and activated various brain regions, suggesting that the observed activity may be linked to developmental differences in the neonatal brain, mirroring patterns seen in human neonates.
Article Abstract
Objective: To identify circuits active during neonatal hypoxic-ischemic (HI) seizures and seizure propagation using electroencephalography (EEG), behavior, and whole-brain neuronal activity mapping.
Methods: Mice were exposed to HI on postnatal day 10 using unilateral carotid ligation and global hypoxia. EEG and video were recorded for the duration of the experiment. Using immediate early gene reporter mice, active cells expressing cfos were permanently tagged with reporter protein tdTomato during a 90-minute window. After 1 week, allowing maximal expression of the reporter protein, whole brains were processed, lipid cleared, and imaged with confocal microscopy. Whole-brain reconstruction and analysis of active neurons (colocalized tdTomato/NeuN) were performed.
Results: HI resulted in seizure behaviors that were bilateral or unilateral tonic-clonic and nonconvulsive in this model. Mice exhibited characteristic EEG background patterns such as burst suppression and suppression. Neuronal activity mapping revealed bilateral motor cortex and unilateral, ischemic somatosensory cortex, lateral thalamus, and hippocampal circuit activation. Immunohistochemical analysis revealed regional differences in myelination, which coincide with these activity patterns. Astrocytes and blood vessel endothelial cells also expressed cfos during HI.
Interpretation: Using a combination of EEG, seizure semiology analysis, and whole-brain neuronal activity mapping, we suggest that this rodent model of neonatal HI results in EEG patterns similar to those observed in human neonates. Activation patterns revealed in this study help explain complex seizure behaviors and EEG patterns observed in neonatal HI injury. This pattern may be, in part, secondary to regional differences in development in the neonatal brain. ANN NEUROL 2019;86:927-938.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7025736 | PMC |
| http://dx.doi.org/10.1002/ana.25601 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The time course and organization of hippocampal replay.
Science
January 2025
Department of Neuroscience, University of California, Berkeley, Berkeley, CA, USA.
The mechanisms by which the brain replays neural activity sequences remain unknown. Recording from large ensembles of hippocampal place cells in freely behaving rats, we observed that replay content is strictly organized over multiple timescales and governed by self-avoidance. After movement cessation, replays avoided the animal's previous path for 3 seconds.
View Article and Find Full Text PDFHippocampal coding of identity, sex, hierarchy, and affiliation in a social group of wild fruit bats.
Science
January 2025
Department of Brain Sciences, Weizmann Institute of Science, Rehovot, Israel.
Social animals live in groups and interact volitionally in complex ways. However, little is known about neural responses under such natural conditions. Here, we investigated hippocampal CA1 neurons in a mixed-sex group of five to 10 freely behaving wild Egyptian fruit bats that lived continuously in a laboratory-based cave and formed a stable social network.
View Article and Find Full Text PDFScratching promotes allergic inflammation and host defense via neurogenic mast cell activation.
Science
January 2025
Department of Dermatology, University of Pittsburgh, Pittsburgh, PA, USA.
Itch is a dominant symptom in dermatitis, and scratching promotes cutaneous inflammation, thereby worsening disease. However, the mechanisms through which scratching exacerbates inflammation and whether scratching provides benefit to the host are largely unknown. We found that scratching was required for skin inflammation in mouse models dependent on FcεRI-mediated mast cell activation.
View Article and Find Full Text PDFSynchronization in spiking neural networks with short and long connections and time delays.
Chaos
January 2025
Institut de Neurosciences des Systèmes, Aix-Marseille University, INSERM, Marseille 13005, France.
Article Synopsis
- Synchronization in brain networks is crucial for processing information, but time delays in signal transmission can significantly influence this process, especially in more complex spiking neural networks.
- The study involves investigating synchronization conditions and dynamics in a two-dimensional network of adaptive exponential integrate-and-fire neurons, focusing on how delay impacts this behavior.
- Findings reveal that synchronization patterns depend on a combination of properties at different levels, including individual neuron characteristics, network connectivity, and long-range connections, which together affect the emergent activity patterns in the brain.
Glia control experience-dependent plasticity in an olfactory critical period.
Elife
January 2025
Department of Neurosciences, Case Western Reserve University School of Medicine, Cleveland, United States.
Sensory experience during developmental critical periods has lifelong consequences for circuit function and behavior, but the molecular and cellular mechanisms through which experience causes these changes are not well understood. The antennal lobe houses synapses between olfactory sensory neurons (OSNs) and downstream projection neurons (PNs) in stereotyped glomeruli. Many glomeruli exhibit structural plasticity in response to early-life odor exposure, indicating a general sensitivity of the fly olfactory circuitry to early sensory experience.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!