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Extracellular Matrix Alterations Due to Early-Life Adversity: Implications for Auditory Learning in Male
Aise Rumeysa Mazi1, Yunus Karakoc2, Cumaali Demirtas3
1Department of Biophysics, Hamidiye Faculty of Medicine, University of Health Sciences, Selimiye Mah. Tibbiye Cad. No:38, 34668, Uskudar, Istanbul, Turkey. aiserumeysa.mazi@sbu.edu.tr.
Molecular Neurobiology
|January 15, 2025
Summary
Early life stress in rats impairs auditory learning by altering brain extracellular matrix (ECM). Enzymatic ECM degradation restored learning, suggesting ECM
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Molecular Biology
Background:
- Early-life adversity (ELA) can profoundly impact brain development and cognitive functions.
- The brain extracellular matrix (ECM) plays a crucial role in synaptic plasticity and neuronal function.
- Understanding the link between ELA, ECM, and cognitive deficits is vital for developing interventions.
Purpose of the Study:
- To investigate how early childhood chronic stress affects the brain's extracellular matrix (ECM).
- To determine if ECM alterations following early-life adversity (ELA) impact auditory learning and cognitive flexibility.
- To explore the potential of ECM modulation as a therapeutic strategy for ELA-induced cognitive deficits.
Main Methods:
- An early-life adversity (ELA) model was established in Sprague-Dawley rats using maternal separation and neonatal isolation.
- Auditory learning and cognitive flexibility were assessed using a cortex-dependent go/no-go task.
- The role of the ECM in cognition was investigated through enzymatic ECM degradation using Hyase.
- Immunohistochemistry was employed to examine the molecular structure of the adult ECM, focusing on perineural nets (PNNs) and parvalbumin-positive cells.
Main Results:
- ELA significantly impaired initial auditory learning but did not affect cognitive flexibility.
- Enzymatic removal of the ECM in the auditory cortex (ACx) restored initial auditory learning in ELA rats.
- ELA rats exhibited reduced perineural net (PNN) density and parvalbumin-positive cell counts in the ACx.
- Degrading the ECM facilitated the repair of auditory learning, even with a reduced PNN presence.
Conclusions:
- Early-life adversity induces significant ECM alterations in the auditory cortex, leading to impaired initial auditory learning.
- The extracellular matrix, particularly PNNs, plays a critical role in mediating the effects of ELA on auditory learning.
- Modulating the ECM, for example, through Hyase injection, holds therapeutic potential for ameliorating ELA-induced learning deficits.
