Metal chaperones prevent zinc-mediated cognitive decline
Paul A Adlard1, Jacqui Parncutt2, Varsha Lal2
1The Florey Institute for Neuroscience and Mental Health and The University of Melbourne, Parkville, Victoria 3052, Australia.
Neurobiology of Disease
|January 1, 2015
Summary
Metal chaperones like clioquinol can prevent age-related cognitive decline by restoring synaptic zinc levels and protein expression in the brain. This research highlights their potential for treating cognitive impairment in aging and Alzheimer's disease.
Area of Science:
- Neuroscience
- Biochemistry
- Pharmacology
Background:
- Zinc transporter-3 (ZnT3) protein regulates synaptic zinc, crucial for learning and memory.
- ZnT3 levels decrease with age and in Alzheimer's disease (AD), contributing to cognitive decline.
- Metal chaperones are being investigated for their therapeutic potential in neurological disorders.
Purpose of the Study:
- To investigate the efficacy of metal chaperones in preventing age-dependent cognitive decline.
- To explore the mechanisms by which metal chaperones restore synaptic function and protein expression.
- To determine if clioquinol increases synaptic zinc content in the hippocampus.
Main Methods:
- Utilized ZnT3 knockout (KO) mouse models for behavioral and electrophysiological analyses.
- Administered clioquinol (30 mg/kg/day for 6 weeks) to assess its effects on cognitive function.
- Analyzed pre- and postsynaptic protein levels (e.g., PSD-95, AMPAR, NMDAR2b) and hippocampal zinc content using synchrotron X-ray fluorescence microscopy.
Main Results:
- Clioquinol treatment prevented age-dependent cognitive deficits in ZnT3 KO mice.
- Clioquinol significantly restored levels of critical pre- and postsynaptic proteins.
- A small increase in hippocampal zinc content was observed, suggesting a role in synaptic restoration.
Conclusions:
- Metal chaperones, such as clioquinol, are effective in preventing cognitive decline associated with aging and AD.
- Restoration of synaptic protein expression and zinc homeostasis are key mechanisms underlying the therapeutic effects.
- Further research is needed to elucidate the precise role of hippocampal sub-regions in clioquinol's effects on synaptic plasticity.
Related Concept Videos
01:30Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists
917
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.
917
01:23Role of Neurotransmitters in Memory
3.0K
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...
Glutamate and Synaptic Plasticity
Glutamate, the brain's main excitatory neurotransmitter, is...
3.0K
01:22Alzheimer's Disease: Treatment
1.3K
Alzheimer's Disease (AD), a neurodegenerative disorder, is pathologically identified by amyloid plaques and neurofibrillary tangles composed of tau protein. AD pharmacotherapy aims to manage cognitive symptoms, delay disease progression, and treat behavioral symptoms. The treatment is primarily symptomatic and palliative, with no definitive disease-modifying therapy available. Cholinesterase inhibitors, including donepezil (Aricept), rivastigmine (Exelon), and galantamine (Razadyne), are...
1.3K
01:30Ligand-Gated Ion Channel Receptor: Gating Mechanism
5.1K
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
5.1K
01:03Long-term Depression
3.6K
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...
Calcium Ion Concentration Mechanism
If over...
3.6K
01:26Alzheimer's Disease: Overview
2.0K
Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
2.0K