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Updated: Jul 30, 2026
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Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats
Published on: November 20, 2015
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Abnormal Local Cortical Functional Connectivity due to Interneuron Dysmaturation after Neonatal Intermittent Hypoxia
Ivan Goussakov1, Sylvia Synowiec1, Rafael Bandeira Fabres1
1Department of Pediatrics, NorthShore University HealthSystem, Evanston, Illinois, 60201.
Summary
Neonatal intermittent hypoxia (IH) in mice impairs motor skills and alters brain development. This early-life stress affects excitatory and inhibitory circuits, leading to long-term cognitive and behavioral changes detectable with functional MRI.
Area of Science:
- Neuroscience
- Developmental Biology
- Physiology
Background:
- Premature infants face hypoxic episodes, impacting cortical development and leading to cognitive/behavioral issues.
- Neonatal intermittent hypoxia (IH) is a critical factor affecting brain maturation in preterm infants.
Purpose of the Study:
- To investigate how neonatal IH affects the maturation of cortical excitatory and inhibitory circuits.
- To identify early biomarkers of altered cortical development using functional MRI.
Main Methods:
- Exposed C57BL/6 mouse pups to IH from P3-P7.
- Assessed motor function using complex wheel tests.
- Performed patch-clamp, evoked field potential recordings, and in vivo electrophysiology.
- Utilized resting-state functional MRI (fMRI) with and without GABAA receptor inhibition (picrotoxin).
Main Results:
- Neonatal IH led to motor hyperactivity and impaired motor learning in adult mice.
- Increased glutamatergic synaptic transmission and decreased GABAergic inhibition in the motor cortex.
- fMRI showed increased intrinsic connectivity in the sensorimotor cortex after IH, exacerbated by picrotoxin.
Conclusions:
- Neonatal IH disrupts the balance of excitatory and inhibitory circuits during cortical development.
- Altered neuronal connectivity and function persist into adulthood, contributing to behavioral abnormalities.
- Resting-state fMRI can detect functional changes in the brain indicative of developmental disruptions after neonatal IH.
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