Little is known about how microcircuits are organized in layer 2 of the medial entorhinal cortex. We visualized principal cell microcircuits and determined cellular theta-rhythmicity in freely moving rats. Non-dentate-projecting, calbindin-positive pyramidal cells bundled dendrites together and formed patches arranged in a hexagonal grid aligned to layer 1 axons, parasubiculum, and cholinergic inputs. Calbindin-negative, dentate-gyrus-projecting stellate cells were distributed across layer 2 but avoided centers of calbindin-positive patches. Cholinergic drive sustained theta-rhythmicity, which was twofold stronger in pyramidal than in stellate neurons. Theta-rhythmicity was cell-type-specific but not distributed as expected from cell-intrinsic properties. Layer 2 divides into a weakly theta-locked stellate cell lattice and spatiotemporally highly organized pyramidal grid. It needs to be assessed how these two distinct principal cell networks contribute to grid cell activity.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1126/science.1243028 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Alzheimer's disease (AD) is a neurodegenerative disease characterized by progressive impairments in episodic and spatial memory, as well as circuit and network-level dysfunction. While functional impairments in medial entorhinal cortex (MEC) and hippocampus (HPC) have been observed in patients and rodent models of AD, it remains unclear how communication between these regions breaks down in disease, and what specific physiological changes are associated with the onset of memory impairment. We used silicon probes to simultaneously record neural activity in MEC and hippocampus before or after the onset of spatial memory impairment in the 3xTg mouse model of AD pathology.
View Article and Find Full Text PDFAltered medial temporal lobe subregion volumes in systemic lupus erythematosus patients with neuropsychiatric symptoms.
BMC Rheumatol
January 2025
Department of Clinical Sciences, Diagnostic Radiology, Lund, Lund University, Lund, Sweden.
Background: Systemic lupus erythematosus (SLE) often presents with neuropsychiatric (NP) involvement, including cognitive impairment and depression. Past magnetic resonance imaging (MRI) research in SLE patients showed smaller hippocampal volumes but did not investigate other medial temporal lobe (MTL) regions. Our study aims to compare MTL subregional volumes in SLE patients to healthy individuals (HI) and explore MTL subregional volumes in relation to neuropsychiatric SLE (NPSLE) manifestations.
View Article and Find Full Text PDFTHE RATIO OF EXCITATORY AND INHIBITORY SYNAPTIC PROCESSES IN NEURONS OF THE ЕNTORHINAL CORTEX OF THE BRAIN, ACTIVATED BY BASOLATERAL AMYGDALA ON THE MODEL OF PARKINSON'S DISEASE, UNDER CONDITIONS OF PROTECTION BY HYDROCORTISONE.
Georgian Med News
November 2024
2Institute of Botany after A. Takhtajyan NAS RA, Yerevan, Armenia.
Parkinson disease (PD) is a common neurodegenerative condition. It affects the central nervous system, and it impairs cognitive processes, motor skills and other functions. The aim of this study was to determine the synaptic processes in medial Entorhinal cortex (mENT) under High frequency stimulation of Basolateral Amygdala on the model of Parkinson's disease under the influence of Hydrocortisone.
View Article and Find Full Text PDFDistinct changes to hippocampal and medial entorhinal circuits emerge across the progression of cognitive deficits in epilepsy.
Cell Rep
January 2025
Nash Family Department of Neuroscience, The Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA. Electronic address:
Temporal lobe epilepsy (TLE) causes pervasive and progressive memory impairments, yet the specific circuit changes that drive these deficits remain unclear. To investigate how hippocampal-entorhinal dysfunction contributes to progressive memory deficits in epilepsy, we performed simultaneous in vivo electrophysiology in the hippocampus (HPC) and medial entorhinal cortex (MEC) of control and epileptic mice 3 or 8 weeks after pilocarpine-induced status epilepticus (Pilo-SE). We found that HPC synchronization deficits (including reduced theta power, coherence, and altered interneuron spike timing) emerged within 3 weeks of Pilo-SE, aligning with early-onset, relatively subtle memory deficits.
View Article and Find Full Text PDFFormation of cognitive maps in large-scale environments by sensorimotor integration.
Cogn Neurodyn
December 2025
School of Systems Science, Beijing Normal University, Beijing, 100875 China.
Hippocampus in the mammalian brain supports navigation by building a cognitive map of the environment. However, only a few studies have investigated cognitive maps in large-scale arenas. To reveal the computational mechanisms underlying the formation of cognitive maps in large-scale environments, we propose a neural network model of the entorhinal-hippocampal neural circuit that integrates both spatial and non-spatial information.
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!