Related Experiment Video
Updated: Jun 20, 2026
10:59
Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury
Published on: November 19, 2012
Hippocampal Glutamatergic Hyperactivation Mediates High-Loading Intensity of Exercise-Induced Cognitive Deficits Via
Qian Bai1,2, Le Wang1, Hedong Lang1
1Chongqing Key Laboratory of Nutrition and Health, Research Center for Nutrition and Food Safety, Chongqing Medical Nutrition Research Center, Institute of Military Preventive Medicine, Army Medical University (Third Military Medical University), Chongqing, China.
CNS Neuroscience & Therapeutics
|June 18, 2026
Summary
High-intensity endurance exercise impairs memory by overactivating hippocampal neurons and disrupting brain circuits. This neural dysfunction highlights a target for preserving cognitive function during intense physical activity.
Area of Science:
- Neuroscience
- Exercise Physiology
- Cognitive Science
Background:
- Excessive exercise can negatively impact cognitive function and increase the risk of cognitive decline later in life.
- The specific neural mechanisms driving these exercise-induced cognitive deficits are not fully understood.
Purpose of the Study:
- To investigate the neural pathways and molecular changes underlying cognitive impairments caused by high-intensity endurance exercise (HLIE).
- To identify specific neuronal populations and brain circuits affected by HLIE.
Main Methods:
- Mice were subjected to a 7-day high-loading intensity exercise (HLIE) protocol.
- Cognitive performance was assessed using behavioral tests (Morris Water Maze, Novel Object Recognition, Y Maze).
- Brain activity and connectivity were analyzed using fMRI and c-Fos mapping, with transcriptional changes examined via snRNA-seq. Chemogenetics targeted hippocampal glutamatergic neurons.
Main Results:
- HLIE led to significant deficits in spatial and working memory in mice.
- The hippocampus (HPC) showed reduced functional connectivity with the medial prefrontal cortex (mPFC) and altered gene expression related to neural activity.
- Hyperactivation of hippocampal glutamatergic neurons was observed, and inhibiting these neurons prevented cognitive decline post-HLIE.
Conclusions:
- High-intensity endurance exercise impairs cognition through hyperactivation of hippocampal glutamatergic neurons and subsequent HPC-mPFC circuit dysfunction.
- Neuronal calcium dysregulation emerges as a key mechanism and potential therapeutic target for maintaining cognitive function under high-intensity exercise conditions.
Related Concept Videos
01:19Role of Hippocampus in Memory
The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
01:14Role of Cerebellum and Prefrontal Cortex in Memory
The cerebellum, while traditionally associated with motor control, also plays a crucial role in memory, particularly in procedural memory, which involves learning motor tasks that become automatic through repetition. For example, studies have shown that when the cerebellum is damaged, individuals or animals lose the ability to learn conditioned motor responses, such as the conditioned eye-blink response in classical conditioning experiments with rabbits. This study demonstrates the cerebellum's...
01:29Hepatic Encephalopathy
DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic shunting—including...
01:25Long-term Potentiation
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when presynaptic neurons...
Hebbian LTP
LTP can occur when presynaptic neurons...
01:35Long-term Potentiation
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.