Cited by 41Neuroscience and Neuropharmacology ResearchMemory and Neural MechanismsTranscranial Magnetic Stimulation Studies

Augmenting saturated LTP by broadly spaced episodes of theta-burst stimulation in hippocampal area CA1 of adult rats and mice

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Cao, Guan, Harris, Kristen M.·2014·Journal of Neurophysiology

Abstract

Hippocampal long-term potentiation (LTP) is a model system for studying cellular mechanisms of learning and memory. Recent interest in mechanisms underlying the advantage of spaced over massed learning has prompted investigation into the effects of distributed episodes of LTP induction. The amount of LTP induced in hippocampal area CA1 by one train (1T) of theta-burst stimulation (TBS) in young Sprague-Dawley rats was further enhanced by additional bouts of 1T given at 1-h intervals. However, in young Long-Evans (LE) rats, 1T did not initially saturate LTP. Instead, a stronger LTP induction paradigm using eight trains of TBS (8T) induced saturated LTP in hippocampal slices from both young and adult LE rats as well as adult mice. The saturated LTP induced by 8T could be augmented by another episode of 8T following an interval of at least 90 min. The success rate across animals and slices in augmenting LTP by an additional episode of 8T increased significantly with longer intervals between the first and last episodes, ranging from 0% at 30- and 60-min intervals to 13–66% at 90- to 180-min intervals to 90–100% at 240-min intervals. Augmentation above initially saturated LTP was blocked by the N-methyl-d-aspartate (NMDA) glutamate receptor antagonist d-2-amino-5-phosphonovaleric acid (d-APV). These findings suggest that the strength of induction and interval between episodes of TBS, as well as the strain and age of the animal, are important components in the augmentation of LTP.

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Crossref · 10.1152/jn.00297.2014

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  • Subsequent spaced trains of theta-burst stimuli, with intervals of 60 minutes or more between trains, were needed for optimal reinforcement of LTP in rat hippocampal slices.

    “subsequent spaced trains of theta-burst stimuli, with intervals of 60 minutes or more between the trains, were needed for optimal reinforcement of LTP46.”
  • The required refractory period of about 1 hour between successive theta-burst stimuli to induce progressive increments in hippocampal LTP may be in line with the variant that short intervals are insufficient for consolidation and consequent summation of memory traces.

    “The required refractory period of ~1 hour between successive theta-burst stimuli to induce progressive increments in hippocampal LTP46,47 may be in line with the first of these variants, which is that short intervals are insufficient for consolidation and consequent summation of memory traces.”

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Authors
Cao, G., & Harris, K. M.
Affiliations
The University of Texas at Austin (US)
Corresponding author
Harris, Kristen M.
Venue
Journal of Neurophysiology
Published
2014-10-15
Volume
112
Issue
8
Pages
1916-1924
ISSN
  • 0022-3077 (ISSN-L)
  • 1522-1598
OpenAlex
W2333605426
Cited by
41
References
60
Citations by year
2026: 4 · 2025: 2 · 2024: 8 · 2023: 4 · 2022: 3 · 2021: 3 · 2020: 4 · 2019: 2 · 2018: 3 · 2017: 2 · 2016: 4 · 2015: 1 · 2014: 1
FWCI
1.22
Type
journal article
Language
en
Open access
Locations
  • Journal of Neurophysiology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of Mental Health (MH-095980, R01MH095980, R01MH104319)
  • National Institute of Neurological Disorders and Stroke (NS21184, R01NS074644, R37NS021184, NS074644)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Neurology › Transcranial Magnetic Stimulation Studies
Keywords
long-term potentiation, theta burst stimulation, hippocampal CA1, NMDA receptor, D-APV, strain differences, age effects, learning and memory
MeSH terms
Age Factors, Animals, Electric Stimulation, Male, Mice, Inbred C57BL, Species Specificity, Time Factors, Rats, Sprague-Dawley, Long-Term Potentiation, Rats, Long-Evans, Mice, Rats, CA1 Region, Hippocampal

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