Emotional dysregulation often accompanies cognitive deficits in Alzheimer's disease (AD). The hippocampus, most notably damaged by AD pathology, is classified into the cognition-bound posterior and emotion-bound anterior hippocampi. Since the anterior hippocampus or its rodent counterpart, the ventral hippocampus (VH), sends dense afferents to the prefrontal cortex (PFC) and the basolateral amygdala (BLA), the two structures implicated in fear responses, we investigated whether these afferents are modified in 3xTg AD model mice. An anterograde dextrin tracer injected into VH revealed that axons in PFC were more ramified in 3xTg than wild-type (WT) mice, with the synaptic density reduced. The VH projections to BLA were not affected. Intracellular accumulation of amyloid β (Aβ) or Aβ-like immunoreactivity was found in PFC and BLA neurons alike. Behaviorally, in the 2-way active avoidance test, the frequency of chamber change was higher, with the test performance better, in 3xTg than WT mice, suggesting a distorted contextual fear in the 3xTg group. Given the essential involvement of parts of PFC in contextual fear responses and that of BLA in fear responses in general, the observed remodeling of VH-to-PFC afferents and the accumulation of intracellular Aβ in BLA and PFC pyramidal cells might exercise critical influences on enhanced avoidance behavior in 3xTg mice.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1002/cne.25032 | DOI Listing |
J Surg Educ
January 2025
Department of Surgery, Faculty of Medicine and Health Sciences, McGill University, 3605 Rue de la Montagne, Montréal, QC, Canada, H3G 2M1; Institute of Health Sciences Education, Faculty of Medicine and Health Sciences, McGill University, 1110 Pine Avenue West, Montréal, QC, Canada, H3A 1A3; Steinberg Centre for Simulation and Interactive Learning, Faculty of Medicine and Health Sciences, McGill University, 3575 Park Ave, Montréal, QC, Canada H2 × 3P9; Research Institute of the McGill University Health Centre, Montreal General Hospital, 1650 Cedar Ave, R1.112, Montreal, QC, H3G 1A4. Electronic address:
Objective: This study examined the response strategies of Surgery residents as bystanders to harassment in a simulated clinical environment, their alignment with the bystander intervention model, and the motivations behind their actions.
Design: Participants watched an educational video on harassment and ways to address it prior to undergoing a simulated clinical scenario where they witnessed a senior resident harassing a medical student. The study used audio-video recordings of the simulations to capture and analyze residents' verbal and nonverbal responses to harassment.
CNS Neurosci Ther
January 2025
Department of Anatomy, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, Henan, China.
Objectives: Endoplasmic reticulum (ER) stress-induced protein homeostasis perturbation is a core pathological element in the pathogenesis of neurodegenerative diseases. This study aims to clarify the unique role played by C/EBP homologous protein (CHOP) as a biomarker of the unfolded protein response (UPR) in the etiology of chronic pain and related cognitive impairments following chronic constrictive nerve injury (CCI).
Methods: The memory capability following CCI was assessed utilizing the Morris water maze (MWM) and fear conditioning test (FCT).
ACS Pharmacol Transl Sci
January 2025
Department of Pharmaceutical Sciences, School of Pharmacy, Texas Tech University Health Science Center, Amarillo, Texas 79106, United States.
Acetyl coenzyme A (acetyl-CoA), a pivotal regulatory metabolite, is a product of numerous catabolic reactions and a substrate for various anabolic responses. Its role extends to crucial physiological processes, such as glucose homeostasis and free fatty acid utilization. Moreover, acetyl-CoA plays a significant part in reshaping the metabolic microenvironment and influencing the progression of several diseases and conditions, including cancer, insulin resistance, diabetes, heart failure, fear, and neuropathic pain.
View Article and Find Full Text PDFMol Psychiatry
January 2025
Icahn School of Medicine at Mount Sinai, Departments of Neuroscience, Psychiatry; Addiction Institute of Mount Sinai, New York, NY, USA.
Anxiety disorders are one of the top contributors to psychiatric burden worldwide. Recent years have seen a dramatic rise in the potential anxiolytic properties ascribed to cannabidiol (CBD), a non-intoxicating constituent of the Cannabis Sativa plant. This has led to several clinical trials underway to examine the therapeutic potential of CBD for anxiety disorders.
View Article and Find Full Text PDFSci Rep
January 2025
Laboratory of Neurolinguistics and Experimental Pragmatics (NEP), University School for Advanced Studies IUSS, Piazza della Vittoria 15, Pavia, 27100, Italy.
Physical Restraint (PR) is a coercive procedure used in emergency psychiatric care to ensure safety in life-threatening situations. Because of its traumatic nature, studies emphasize the importance of considering the patient's subjective experience. We pursued this aim by overcoming classic qualitative approaches and innovatively applying a multilayered semiautomated language analysis to a corpus of narratives about PR collected from 99 individuals across seven mental health services in Italy.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!