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The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia

The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia

Published on: November 19, 2008

Ascorbic acid protects the newborn rat brain from hypoxic-ischemia.

Shinobu Miura¹, Wako Ishida-Nakajima, Akira Ishida

¹Department of Pediatrics, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan. miurash@doc.med.akita-u.ac.jp

Brain & Development

|August 7, 2008

Summary

Ascorbic acid (AA) demonstrates neuroprotective effects by reducing brain injury in immature rats after hypoxic-ischemic (HI) events. This antioxidant significantly decreases both necrotic and apoptotic cell death, highlighting its potential therapeutic role.

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Area of Science:

Neuroscience
Biochemistry
Pediatric Neurology

Background:

Ascorbic acid (AA), a known antioxidant, has potential neuroprotective properties that require further investigation.
Hypoxic-ischemic (HI) brain injury in immature mammals is a significant clinical concern with limited treatment options.

Purpose of the Study:

To evaluate the neuroprotective efficacy of Ascorbic acid (AA) in an immature rat model of hypoxic-ischemic (HI) brain injury.
To determine the impact of AA on cell death pathways and specific molecular markers of brain damage post-HI.

Main Methods:

The Rice-Vannucci model was employed in 7-day-old rat pups subjected to HI.
Ascorbic acid (AA) was administered via intraperitoneal injection prior to hypoxic exposure (8% oxygen for 90 min).
Brain injury scores, cell death (necrosis, apoptosis, TUNEL assay), and protein degradation markers (alpha-fodrin breakdown products) were assessed using Western blot analysis.

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Published on: November 20, 2015

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Last Updated: Jul 3, 2026

The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia

The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia

Published on: November 19, 2008

Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats

Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats

Published on: November 20, 2015

Main Results:

AA administration significantly reduced macroscopic brain injury scores at 48 and 168 hours post-HI compared to vehicle controls.
AA injection markedly decreased the number of necrotic and apoptotic cells across multiple brain regions, including the cortex, caudate putamen, thalamus, and hippocampus.
Western blot analysis confirmed that AA suppressed the breakdown products of alpha-fodrin, indicating inhibition of both calpain and caspase-3 activation, although free radical production was not demonstrably inhibited.

Conclusions:

Ascorbic acid (AA) exerts significant neuroprotective effects against hypoxic-ischemic (HI) brain injury in immature rats.
AA mitigates brain damage by inhibiting both necrotic and apoptotic cell death pathways, suggesting its potential as a therapeutic agent for neonatal brain injury.