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Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats
Published on: November 20, 2015
Immuno-modulator inter-alpha inhibitor proteins ameliorate complex auditory processing deficits in rats with neonatal
Steven W Threlkeld1, Yow-Pin Lim2, Molly La Rue3
1Department of Neuroscience, Regis College, 235 Wellesley Street, Weston, MA 02493, USA.
Insights
Systemic administration of Inter-alpha inhibitor proteins (IAIPs) improved auditory processing in neonatal brain injury models. This offers potential for treating language learning deficits in infants with hypoxic-ischemic encephalopathy.
Area of Science:
- Neuroscience
- Neonatal Research
- Biochemistry
Background:
- Hypoxic-ischemic (HI) brain injury is a major cause of cognitive and language impairments in newborns.
- Central auditory processing deficits are common in infants with hypoxic-ischemic encephalopathy and predict future language difficulties.
- Inter-alpha inhibitor proteins (IAIPs) are plasma proteins known to modulate inflammation and protect against cell death.
Purpose of the Study:
- To investigate the therapeutic potential of IAIPs in mitigating central auditory processing deficits following neonatal HI brain injury.
- To assess the impact of IAIP administration on learning and auditory discrimination in a neonatal brain injury model.
Main Methods:
- Neonatal rats were subjected to hypoxic-ischemic (HI) brain injury.
- Systemic administration of IAIPs was performed during the early stages of the HI injury cascade.
- Complex auditory discrimination abilities were assessed in HI-injured subjects treated with IAIPs compared to untreated controls.
Main Results:
- Systemic IAIP administration significantly ameliorated complex auditory discrimination deficits in HI-injured neonates.
- Treated subjects showed improved auditory processing compared to untreated HI-injured subjects, even with reduced brain weight.
- IAIPs demonstrated a protective effect against HI-induced auditory processing impairments.
Conclusions:
- Systemic IAIPs show promise in improving central auditory processing deficits in neonates with HI brain injury.
- These findings suggest a potential clinical application of IAIPs for enhancing language learning outcomes in at-risk infants.
- IAIPs represent a potential therapeutic strategy for addressing cognitive impairments following perinatal brain injury.
Abstract:
Hypoxic-ischemic (HI) brain injury is recognized as a significant problem in the perinatal period, contributing to life-long language-learning and other cognitive impairments. Central auditory processing deficits are common in infants with hypoxic-ischemic encephalopathy and have been shown to predict language learning deficits in other at risk infant populations. Inter-alpha inhibitor proteins (IAIPs) are a family of structurally related plasma proteins that modulate the systemic inflammatory response to infection and have been shown to attenuate cell death and improve learning outcomes after neonatal brain injury in rats. Here, we show that systemic administration of IAIPs during the early HI injury cascade ameliorates complex auditory discrimination deficits as compared to untreated HI injured subjects, despite reductions in brain weight. These findings have significant clinical implications for improving central auditory processing deficits linked to language learning in neonates with HI related brain injury.
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