Age-related upregulation of dense core vesicles in the central inferior colliculus
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View abstract on PubMed
Summary
This summary is machine-generated.Aging hearing loss (presbycusis) involves changes in the central auditory system. This study found increased dense core vesicles (DCVs) in the aging inferior colliculus (IC), suggesting preserved protein transport despite age-related decline.
Area Of Science
- Neuroscience
- Auditory System Research
- Aging and Hearing Loss
Background
- Presbycusis, or age-related hearing loss, is a prevalent disability.
- The aging central auditory system, specifically the inferior colliculus (IC), attempts to compensate for reduced peripheral excitation by downregulating GABAergic inhibition.
- This compensatory downregulation can paradoxically disrupt temporal precision, contributing to presbycusis.
Purpose Of The Study
- To investigate the role of dense core vesicles (DCVs) in the aging inferior colliculus (IC).
- To examine age-related ultrastructural changes in DCVs within the IC.
- To determine the neurochemical profile and localization of DCVs in aging rats.
Main Methods
- Immuno transmission electron microscopy was used on Fisher Brown Norway rats across four age groups.
- Tissue was stained for GABA immunoreactivity.
- DCVs were characterized by diameter and neurochemical profile (GABAergic/non-GABAergic) in various neuronal compartments (bouton, axon, soma, dendrite) across the IC axis.
Main Results
- A significant age-related increase in DCVs was observed, particularly in non-GABAergic dendrites in specific IC regions.
- The probability of presynaptic boutons containing multiple DCVs increased with age.
- While overall terminal density decreased with age, the proportion of terminals with at least one DCV remained stable, suggesting preservation of DCV-packaged cargo.
Conclusions
- Terminals packaging proteins within DCVs appear to be spared during aging in the IC.
- The age-related upregulation of DCVs in the IC warrants further investigation into the role of neuropeptides in presbycusis and tinnitus.
- Future research should explore age-related changes in IC neuropeptides and their contribution to altered inhibition and excitability.
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