Abstract
Hypoxia associated with perinatal events can result in brain damage in the neonate. In labor and eclampsia, hypoxia can be intermittent, which may result in more severe damage than sustained hypoxia. The pathogenesis of brain injury in sustained ischemia involves free radical production; therefore, we investigated whether higher levels of free radicals contribute to the greater injury induced by repetitive ischemia. Brains were obtained from fetuses of near-term, pregnant rabbits subjected to repetitive ischemia- reperfusion (RIR), sustained uterine ischemia-reperfusion (IR), or a control protocol. Compared with controls, fetal brains from RIR or IR groups had more brain edema. Brains from RIR fetuses exhibited higher levels of lipid peroxidation, 3-nitrotyrosine, and nitrogen oxides, and lower total antioxidant capacity and cortical cellular viability than those of IR or control fetuses. Maternal administration of antioxidants following RIR and fetal bradycardia resulted in lower levels of fetal cortical and hippocampal cell death. Coadministration of Trolox and ascorbic acid resulted in less brain edema and liquefaction, and fewer hippocampal ischemic nuclei as compared with the saline control. Higher free radical production may be responsible for the greater fetal brain injury following repetitive hypoxia- reoxygenation. Maternal antioxidant treatment resulted in transplacental passage of antioxidants and amelioration of brain injury, and may be a viable clinical option following diagnosis of fetal distress.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 972-981 |
| Number of pages | 10 |
| Journal | Journal of Neuropathology and Experimental Neurology |
| Volume | 58 |
| Issue number | 9 |
| State | Published - Sep 1999 |
| Externally published | Yes |
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Keywords
- Antioxidants
- Ascorbic acid
- Hippocampus
- Oxidants
- Vitamin E
ASJC Scopus subject areas
- Pathology and Forensic Medicine
- Neuroscience(all)
Cite this
Increased injury following intermittent fetal hypoxia-reoxygenation is associated with increased free radical production in fetal rabbit brain. / Tan, Sidhartha; Zhou, Fen; Nielsen, Vance G; Wang, Ziwei; Gladson, Candece L.; Parks, Dale A.
In: Journal of Neuropathology and Experimental Neurology, Vol. 58, No. 9, 09.1999, p. 972-981.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Increased injury following intermittent fetal hypoxia-reoxygenation is associated with increased free radical production in fetal rabbit brain
AU - Tan, Sidhartha
AU - Zhou, Fen
AU - Nielsen, Vance G
AU - Wang, Ziwei
AU - Gladson, Candece L.
AU - Parks, Dale A.
PY - 1999/9
Y1 - 1999/9
N2 - Hypoxia associated with perinatal events can result in brain damage in the neonate. In labor and eclampsia, hypoxia can be intermittent, which may result in more severe damage than sustained hypoxia. The pathogenesis of brain injury in sustained ischemia involves free radical production; therefore, we investigated whether higher levels of free radicals contribute to the greater injury induced by repetitive ischemia. Brains were obtained from fetuses of near-term, pregnant rabbits subjected to repetitive ischemia- reperfusion (RIR), sustained uterine ischemia-reperfusion (IR), or a control protocol. Compared with controls, fetal brains from RIR or IR groups had more brain edema. Brains from RIR fetuses exhibited higher levels of lipid peroxidation, 3-nitrotyrosine, and nitrogen oxides, and lower total antioxidant capacity and cortical cellular viability than those of IR or control fetuses. Maternal administration of antioxidants following RIR and fetal bradycardia resulted in lower levels of fetal cortical and hippocampal cell death. Coadministration of Trolox and ascorbic acid resulted in less brain edema and liquefaction, and fewer hippocampal ischemic nuclei as compared with the saline control. Higher free radical production may be responsible for the greater fetal brain injury following repetitive hypoxia- reoxygenation. Maternal antioxidant treatment resulted in transplacental passage of antioxidants and amelioration of brain injury, and may be a viable clinical option following diagnosis of fetal distress.
AB - Hypoxia associated with perinatal events can result in brain damage in the neonate. In labor and eclampsia, hypoxia can be intermittent, which may result in more severe damage than sustained hypoxia. The pathogenesis of brain injury in sustained ischemia involves free radical production; therefore, we investigated whether higher levels of free radicals contribute to the greater injury induced by repetitive ischemia. Brains were obtained from fetuses of near-term, pregnant rabbits subjected to repetitive ischemia- reperfusion (RIR), sustained uterine ischemia-reperfusion (IR), or a control protocol. Compared with controls, fetal brains from RIR or IR groups had more brain edema. Brains from RIR fetuses exhibited higher levels of lipid peroxidation, 3-nitrotyrosine, and nitrogen oxides, and lower total antioxidant capacity and cortical cellular viability than those of IR or control fetuses. Maternal administration of antioxidants following RIR and fetal bradycardia resulted in lower levels of fetal cortical and hippocampal cell death. Coadministration of Trolox and ascorbic acid resulted in less brain edema and liquefaction, and fewer hippocampal ischemic nuclei as compared with the saline control. Higher free radical production may be responsible for the greater fetal brain injury following repetitive hypoxia- reoxygenation. Maternal antioxidant treatment resulted in transplacental passage of antioxidants and amelioration of brain injury, and may be a viable clinical option following diagnosis of fetal distress.
KW - Antioxidants
KW - Ascorbic acid
KW - Hippocampus
KW - Oxidants
KW - Vitamin E
UR - http://www.scopus.com/inward/record.url?scp=0032827116&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032827116&partnerID=8YFLogxK
M3 - Article
C2 - 10499439
AN - SCOPUS:0032827116
VL - 58
SP - 972
EP - 981
JO - American Journal of Psychotherapy
JF - American Journal of Psychotherapy
SN - 0002-9564
IS - 9
ER -