Age-related upregulation of perineuronal nets on inferior collicular cells that project to the cochlear nucleus.
Wisteria floribunda agglutinin
aging
cochlear nucleus (CN)
inferior colliculus
perineuronal nets
Journal
Frontiers in aging neuroscience
ISSN: 1663-4365
Titre abrégé: Front Aging Neurosci
Pays: Switzerland
ID NLM: 101525824
Informations de publication
Date de publication:
2023
2023
Historique:
received:
01
08
2023
accepted:
26
10
2023
medline:
6
12
2023
pubmed:
6
12
2023
entrez:
6
12
2023
Statut:
epublish
Résumé
Disruptions to the balance of excitation and inhibition in the inferior colliculus (IC) occur during aging and underlie various aspects of hearing loss. Specifically, the age-related alteration to GABAergic neurotransmission in the IC likely contributes to the poorer temporal precision characteristic of presbycusis. Perineuronal nets (PNs), a specialized form of the extracellular matrix, maintain excitatory/inhibitory synaptic environments and reduce structural plasticity. We sought to determine whether PNs increasingly surround cell populations in the aged IC that comprise excitatory descending projections to the cochlear nucleus. We combined Wisteria floribunda agglutinin (WFA) staining for PNs with retrograde tract-tracing in three age groups of Fischer Brown Norway (FBN) rats. The data demonstrate that the percentage of IC-CN cells with a PN doubles from ~10% at young age to ~20% at old age. This was true in both lemniscal and non-lemniscal IC. Furthermore, the increase of PNs occurred on IC cells that make both ipsilateral and contralateral descending projections to the CN. These results indicate that reduced structural plasticity in the elderly IC-CN pathway, affecting excitatory/inhibitory balance and, potentially, may lead to reduced temporal precision associated with presbycusis.
Identifiants
pubmed: 38053844
doi: 10.3389/fnagi.2023.1271008
pmc: PMC10694216
doi:
Types de publication
Journal Article
Langues
eng
Pagination
1271008Informations de copyright
Copyright © 2023 Almassri, Ohl, Iafrate, Wade, Tokar, Mafi, Beebe, Young and Mellott.
Déclaration de conflit d'intérêts
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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