Oxidant mechanisms in neonatal hypoxia-ischemia.

Abstract:

:The neonatal brain appears to be selectively vulnerable to oxidative stress. Several potential mechanisms associated with altered reactive oxygen species metabolism would explain the increased susceptibility. They include increased accumulation of hydrogen peroxide with subsequent neurotoxicity. This enhanced neurotoxicity from H2O2 accumulation may be related to inadequate scavenging abilities of the immature nervous system, such as lower glutathione peroxidase activity. Contributing to the immaturity of the scavenging enzymes is the inability of the developing nervous system to maintain glutathione stores. The immature nervous system is rich in iron, and has more free iron than the mature nervous system. As H2O2 accumulates because of these improper defense mechanisms, it is exposed to this free iron. This exposure results in the generation of OH radical (Fenton reaction), a more potent free radical that can cause severe damage. The rapid conversion of H2O2 to OH in the setting of free iron sets up the immature nervous system for increased cytotoxicity. Understanding the molecular mechanisms of oxidative stress will lead to better therapies for neonatal hypoxia-ischemia.

journal_name

Dev Neurosci

authors

Ferriero DM

doi

10.1159/000046143

keywords:

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

198-202

issue

3

eissn

0378-5866

issn

1421-9859

pii

46143

journal_volume

23

pub_type

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