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Dual role of intrauterine immune challenge on neonatal and adult brain vulnerability to hypoxia-ischemia

Artikel i vetenskaplig tidskrift
Författare Xiaoyang Wang
Henrik Hagberg
Chunxia Nie
Changlian Zhu
Tomoaki Ikeda
Carina Mallard
Publicerad i J Neuropathol Exp Neurol
Volym 66
Nummer/häfte 6
Sidor 552-61
Publiceringsår 2007
Publicerad vid Institutionen för neurovetenskap och fysiologi, sektionen för fysiologi
Institutionen för kliniska vetenskaper
Sidor 552-61
Språk en
Länkar www.ncbi.nlm.nih.gov/entrez/query.f...
Ämnesord *Aging, Animals, *Animals, Newborn, Brain/metabolism/pathology, Brain Ischemia/*etiology/pathology, Caspase 3/metabolism, Disease Susceptibility, Enzyme Activation, Female, Hypoxia, Brain/*etiology/pathology, Immunohistochemistry, Lipopolysaccharides/*administration & dosage/pharmacology, Mice, Mice, Inbred C57BL, Myelin Sheath/drug effects, NF-kappa B/metabolism, Neuroprotective Agents/*administration & dosage/pharmacology, Pregnancy, *Prenatal Exposure Delayed Effects
Ämneskategorier Medicin och Hälsovetenskap

Sammanfattning

Epidemiologic evidence has underlined the impact of prenatal inflammation on the development of postnatal hypoxia-ischemia (HI) brain injury. To study to what extent prenatal inflammation affects CNS vulnerability later during development, C57BL/6 mice were subjected to intrauterine injection of lipopolysaccharide (LPS) at gestational day 15. At postnatal day (PND) 5, 9, and 70, the offspring were subjected to HI. It was found that, in neonatal mice, LPS-exposed brains showed markedly enhanced brain injury after HI, whereas in adult mice, LPS exposure resulted in a significant reduction in tissue loss after HI. Reduced myelin in subcortical white matter was noticed after HI in the LPS-exposed brains at PND14 and PND75. Increased activities of nuclear factor-kappaB and caspase-3 were obtained in fetal/neonatal brain after LPS administration. Conclusions were that 1) a prenatal low dose of LPS sensitized to HI-induced brain injury in neonates but confers protection in adulthood, 2) reduced myelination is seen after prenatal LPS exposure and HI in both neonatal and adult mice despite the fact that LPS reduced total tissue loss in adult mice; and 3) nuclear factor-kappaB and caspase-3 activation early after LPS exposure may play a role in the sensitization/protection (preconditioning) effects.

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