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Updated: Oct 7, 2026
A Swine Model of Neonatal Asphyxia
Published on: October 11, 2011
Cerebral hypoxia-ischemia increases microsomal iron in newborn piglets
L M Adcock1, Y Yamashita, J Goddard-Finegold
1Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA.
Insights
Hypoxic-ischemic injury in newborns causes brain damage, partly due to iron's role. This study found that nonheme iron shifts to specific brain cell parts after injury, potentially increasing oxidative damage.
Area of Science:
- Neuroscience
- Biochemistry
- Neonatal Medicine
Background:
- Hypoxic-ischemic injury is a major cause of newborn brain damage.
- Reactive oxygen species and disrupted iron homeostasis contribute to this damage.
- Understanding iron's role in brain injury is crucial for developing treatments.
Purpose of the Study:
- To investigate the effects of cerebral hypoxia-ischemia and reperfusion on nonheme iron redistribution in newborn piglets.
- To explore the link between iron translocation and oxidative damage to brain proteins.
Main Methods:
- Newborn piglets were subjected to controlled cerebral hypoxia-ischemia and reperfusion.
- Subcellular fractions of brain tissue were isolated using differential centrifugation.
- Nonheme iron content was measured using the ferene-S assay.
- Protein carbonyls, markers of oxidation, were detected.
Main Results:
- Total homogenate iron content remained unchanged after hypoxia-ischemia and reperfusion.
- Nonheme iron significantly increased in microsomal fractions following 30 minutes of hypoxia-ischemia (p < 0.01).
- Reperfusion for 120 minutes did not alter iron levels further.
Conclusions:
- Cerebral hypoxia-ischemia causes a redistribution of nonheme iron within the brain in newborn piglets.
- This iron translocation may contribute to oxidative damage of brain proteins.
- Further research is needed to clarify iron's precise role in neonatal hypoxic-ischemic brain injury.
Abstract:
The primary cause of neurologic impairment in newborn infants is hypoxic-ischemic injury. Studies of the mechanisms involved in the damaging effects of hypoxia-ischemia and reperfusion in brain tissue indicate significant contributions from reactive oxygen species, with the loss of homeostatic control of intracellular iron an important determinant of oxidant-mediated damage. We investigated the effects of cerebral hypoxia-ischemia and reperfusion on the redistribution of nonheme iron in newborn piglets. Anesthetized newborn piglets were subjected to reductions in cerebral blood flow by phlebotomy and cervical cuff compression. Control animals were sham-operated. Subcellular fractions were isolated from brain tissue homogenates by differential centrifugation, and nonheme iron contents of these fractions were measured with ferene-S. Iron contents in the homogenates were not altered. However, iron contents of the microsomal fractions of animals subjected to 30 minutes of hypoxia-ischemia increased from 0.517 +/- 0.053 to 0.930 +/- 0.061 nmol/mg protein (p < 0.01); 120 minutes of reperfusion caused no further changes. This translocation of iron may be linked to oxidative alterations of brain proteins, which we investigated by detection of dinitrophenylhydrazine-derivitized protein carbonyls, which are characteristic of iron-catalyzed oxidation reactions.
