Related Experiment Video
Updated: May 7, 2026
14:57
Preparation of Acute Hippocampal Slices from Rats and Transgenic Mice for the Study of Synaptic Alterations during Aging and Amyloid Pathology
Published on: March 23, 2011
Linking redox regulation of NMDAR synaptic function to cognitive decline during aging
1Department of Neuroscience, McKnight Brain Institute, University of Florida, Gainesville, Florida 32610.
Summary
A decline in NMDA receptors (NMDARs) linked to aging impairs spatial memory. Restoring NMDAR function with reducing agents improved memory in aged rats, suggesting a redox-mediated mechanism for cognitive decline.
Area of Science:
- Neuroscience
- Cognitive Aging
- Synaptic Plasticity
Background:
- NMDA receptors (NMDARs) are crucial for learning and memory.
- Aging is associated with cognitive decline, but a direct link to reduced NMDAR function is unclear.
- Redox modulation of synaptic transmission may influence age-related cognitive changes.
Purpose of the Study:
- To investigate the relationship between redox-mediated NMDAR decline and impaired spatial memory in aging.
- To determine if reduced NMDAR function underlies deficits in rapid spatial information acquisition and retention.
Main Methods:
- Spatial water maze task to assess memory in young and middle-aged rats.
- Electrophysiological recordings in hippocampal slices to measure synaptic transmission and NMDAR function.
- Behavioral classification of middle-aged rats as impaired or unimpaired.
Main Results:
- An age-related decrease in synaptic responses, including the NMDAR component, was observed.
- Impaired rats showed reduced NMDAR function compared to unimpaired and young rats.
- Dithiothreitol (a reducing agent) enhanced NMDAR function more in impaired rats, suggesting a redox-dependent deficit.
Conclusions:
- A redox-mediated decline in NMDAR function is linked to impaired spatial memory acquisition and retention in aging.
- This study provides evidence for a specific cognitive phenotype associated with age-related NMDAR dysfunction.
- Targeting redox modulation of NMDARs may offer therapeutic potential for age-related memory deficits.
More Related Videos
Related Concept Videos
01:03Long-term Depression
Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Calcium Ion Concentration Mechanism
If over time, all...
Calcium Ion Concentration Mechanism
If over time, all...
01:05Long-term Depression
Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
01:30Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists
Cognitive enhancers, also known as "smart drugs," are substances used to enhance memory, mental alertness, and concentration. These can be natural or synthetic and improve cognition in conditions like Alzheimer's disease (AD) and other neurodegenerative diseases. Some common examples include caffeine, amphetamines, methylphenidate, modafinil, arecoline, donepezil, vortioxetine, and piracetam. These enhancers work on the principle of synaptic plasticity and altered circuit function. They...
01:26Aging
Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
01:23Role of Neurotransmitters in Memory
Neurotransmitters are integral to the brain's communication system, enabling neurons to transmit signals across synapses. This chemical exchange underpins various cognitive functions, including memory processes. The role of neurotransmitters in memory is multifaceted, influencing the encoding, consolidation, and retrieval of memories through their action on different neural circuits.
Glutamate and Synaptic Plasticity
Glutamate, the brain's main excitatory neurotransmitter, is critical for...
Glutamate and Synaptic Plasticity
Glutamate, the brain's main excitatory neurotransmitter, is critical for...
01:46Electron Transport Chain: Complex I and II
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...