Cited by 48Transcranial Magnetic Stimulation StudiesNeuroscience and Neuropharmacology ResearchNeural dynamics and brain function

Reduction in cortical parvalbumin expression due to intermittent theta-burst stimulation correlates with maturation of the perineuronal nets in young rats

Mix, Annika, Hoppenrath, Kathrin, Funke, Klaus·2015·Developmental Neurobiology

Abstract

We recently showed that intermittent theta-burst stimulation (iTBS) using transcranial magnetic stimulation strongly reduces the number of rat neocortical interneurons expressing glutamic acid decarboxylase 67 kDa (GAD67) and parvalbumin (PV), indicating changed activity of fast-spiking (FS) interneurons. In advance of in vitro studies intended to characterize changes in electrical properties of FS interneurons under these conditions, we tested whether the iTBS effect is age-dependent. Conscious Sprague-Dawley rats aged between 28 and 90 days received three blocks of iTBS at 15 min intervals. We found that iTBS-related reduction in PV+ cells was absent up to an age of 32 days, then gradually increased, and approached a maximum of about 40% reduction at an age of about 40 days. The relative number of cells expressing PV (PV+, 8-9%) did not change with age in sham-controls and also the increase in cortical c-Fos expression induced by iTBS was not principally age-dependent. However, a prominent growth of the perineuronal nets, typically surrounding the PV+ cells, exactly paralleled the increase in the iTBS effect. Based on these findings, we conclude that the functional development of the inhibitory network of PV+ interneurons with regard to intracortical synaptic connectivity is not sufficiently matured in rats younger than 35 d to enable activity-dependent modifications during iTBS. Outgrowth of the perineuronal nets and associated maturation of excitatory cortical inputs, as is characteristic for the critical cortical period, may take place before PV+ interneurons can be sufficiently activated via repetitive transcranial magnetic stimulation, allowing plastic changes of molecular phenotype and likely also synaptic plasticity.

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Crossref · 10.1002/dneu.22205

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Authors
Mix, A., Hoppenrath, K., & Funke, K.
Affiliations
Ruhr University Bochum (DE)
Corresponding author
Funke, Klaus
Venue
Developmental Neurobiology
Publisher
Wiley
Published
2014-06-26
Volume
75
Issue
1
Pages
1-11
ISSN
  • 1932-8451 (ISSN-L)
  • 1932-846X
OpenAlex
W1546926080
Cited by
48
References
47
Citations by year
2026: 1 · 2025: 2 · 2024: 1 · 2023: 3 · 2022: 8 · 2021: 6 · 2020: 4 · 2019: 3 · 2018: 7 · 2017: 4 · 2016: 5 · 2015: 3 · 2014: 1
FWCI
2.26
Type
journal article
Language
en
Open access
closed
Locations
  • Developmental Neurobiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
German Science Foundation (DFG) (SFB 874 TP A4)
Topics
  • Life Sciences › Neuroscience › Neurology › Transcranial Magnetic Stimulation Studies
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
Keywords
intermittent theta burst stimulation, parvalbumin, perineuronal nets, fast-spiking interneurons, cortical development, age-dependent plasticity, GAD67, c-fos, critical period, synaptic plasticity, transcranial magnetic stimulation
MeSH terms
Age Factors, Animals, Cerebral Cortex, Interneurons, Male, Neural Inhibition, Neuronal Plasticity, Parvalbumins, Theta Rhythm, Rats, Sprague-Dawley, Transcranial Magnetic Stimulation, Rats

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