Pentylenetetrazol (PTZ)-kindling represents a model of a primarily generalized epilepsy. We investigated the role of the dentate gyrus of the hippocampus in this model of epilepsy by destruction of this structure by colchicine, injected in the dorsal and ventral hippocampus of rats. After a period of 7 days PTZ-kindling was started. The kindling development was slightly accelerated in colchicine treated animals compared to control rats. After kindling completion the learning performance of the rats was tested in a shuttle-box experiment. The learning deficit found in fully kindled rats was not influenced by colchicine pretreatment. However, colchicine itself impaired the learning performance of rats in the shuttle-box.
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http://dx.doi.org/10.1016/0031-9384(95)00111-u | DOI Listing |
Learn Mem
January 2025
Psychology Department, Hunter College, City University of New York, New York, New York 10065, USA
Social isolation is a risk factor for cognitive impairment. Adolescents may be particularly vulnerable to these effects, because they are in a critical period of development marked by significant physical, hormonal, and social changes. However, it is unclear if the effects of social isolation on learning and memory are similar in both sexes or if they persist into adulthood after a period of recovery.
View Article and Find Full Text PDFNarra J
December 2024
Department of Nutrition, Faculty of Medicine Science, Universitas Brawijaya, Malang, Indonesia.
Velvet bean is a native Indonesian legume containing L-dopa, yet it remains underutilized. The aim of this study was to analyze the effects of different types of tempe (soybean, velvet bean, and their combination) on cognitive function, brain histology, dopamine levels, and serum β-amyloid in rats, as well as to identify the parameters most influencing cognitive function, including brain mass and volume, hippocampal neuron count, and dopamine and β-amyloid levels. An experimental study was conducted using a completely randomized design with one factor: the protein source of diet.
View Article and Find Full Text PDFActa Neurobiol Exp (Wars)
January 2025
Laboratory of Animal Models, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland.
The phosphatase and tensin homolog deleted on chromosome 10 (PTEN) gene is a critical tumor suppressor that plays an essential role in the development and functionality of the central nervous system. Located on chromosome 10 in humans and chromosome 19 in mice, PTEN encodes a protein that regulates cellular processes such as division, proliferation, growth, and survival by antagonizing the PI3K‑Akt‑mTOR signaling pathway. In neurons, PTEN dephosphorylates phosphatidylinositol‑3,4,5‑trisphosphate (PIP3) to PIP2, thereby modulating key signaling cascades involved in neurogenesis, neuronal migration, and synaptic plasticity.
View Article and Find Full Text PDFCogn Neurodyn
December 2025
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, #10 Xitucheng Road, Beijing, 100876 People's Republic of China.
The dentate gyrus (DG) in hippocampus is reported to perform pattern separation, converting similar inputs into different outputs and thus avoiding memory interference. Previous studies have found that human and mice with epilepsy have significant pattern separation defects and a portion of adult-born granule cells (abGCs) migrate abnormally into the hilus, forming hilus ectopic granule cells (HEGCs). For the lack of relevant pathophysiological experiments, how HEGCs affect pattern separation remains unclear.
View Article and Find Full Text PDFStrahlenther Onkol
January 2025
Department of Radiation Medicine, Lenox Hill Hospital, Zucker School of Medicine at Hofstra/Northwell, New York, NY, USA.
Purpose: A comprehensive literature review was undertaken to understand the effects and underlying mechanisms of cranial radiotherapy (RT) on the hippocampus and hippocampal neurogenesis as well as to explore protective factors and treatments that might mitigate these effects in preclinical studies.
Methods: PubMed/MEDLINE, Web of Science, and Embase were queried for studies involving the effects of radiation on the hippocampus and hippocampal neurogenesis. Data extraction followed the Animal Research Reporting of In Vivo Experiments (ARRIVE) guidelines, and a risk of bias assessment was conducted for the included animal studies using the Systematic Review Centre for Laboratory Animal Experimentation (SYRCLE) risk of bias tool.
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