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Related Concept Videos

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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.
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Long-term Potentiation

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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.
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Preparation of Acute Hippocampal Slices from Rats and Transgenic Mice for the Study of Synaptic Alterations during Aging and Amyloid Pathology
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Long-term α1A-adrenergic receptor stimulation improves synaptic plasticity, cognitive function, mood, and longevity.

Van A Doze1, Robert S Papay, Brianna L Goldenstein

  • 1Department of Pharmacology, Physiology & Therapeutics, School of Medicine & Health Sciences, University of North Dakota, Grand Forks, North Dakota, USA.

Molecular Pharmacology
|July 28, 2011
PubMed
Summary

Long-term stimulation of alpha(1A)-adrenergic receptors (α(1A)AR) enhances learning, memory, and mood. This suggests α(1A)ARs are a promising target for cognitive and mood disorders.

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Published on: November 29, 2013

Area of Science:

  • Neuroscience
  • Pharmacology
  • Aging Research

Background:

  • The role of alpha(1)-adrenergic receptors (α(1)ARs) in cognition and mood is unclear, potentially due to nonselective agents.
  • Recent findings link α(1A)AR activation to increased neurogenesis, a process vital for cognitive and emotional health.

Purpose of the Study:

  • To investigate the long-term effects of stimulating the α(1A)AR subtype on cognitive function, mood, and lifespan.
  • To explore the therapeutic potential of targeting α(1A)ARs for age-related cognitive and mood decline.

Main Methods:

  • Utilized transgenic mice expressing a constitutively active mutant (CAM) α(1A)AR (CAM-α(1A)AR mice).
  • Assessed cognitive performance using behavioral models of learning and memory.
  • Examined synaptic plasticity in hippocampal slices.
  • Administered α(1A)AR-selective agonist cirazoline to wild-type (WT) mice.
  • Evaluated mood and anxiety-related behaviors.
  • Monitored lifespan.

Main Results:

  • CAM-α(1A)AR mice exhibited enhanced learning, memory, and synaptic plasticity (increased basal synaptic transmission, paired-pulse facilitation, and long-term potentiation).
  • Mice lacking the α(1A)AR gene showed impaired cognitive function.
  • WT mice treated with cirazoline also displayed improved cognitive functions.
  • CAM-α(1A)AR mice showed antidepressant-like and anxiolytic-like phenotypes.
  • Lifespan in CAM-α(1A)AR mice was extended by 10% compared to WT mice.

Conclusions:

  • Long-term α(1A)AR stimulation significantly improves synaptic plasticity, cognitive function, and mood.
  • Targeting α(1A)ARs may offer a novel therapeutic strategy for mitigating cognitive and mood deficits associated with aging and neurological disorders.
  • Enhanced α(1A)AR signaling may contribute to increased longevity.