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Updated: Jan 20, 2026

Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats
07:36

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

Published on: November 20, 2015

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Perinatal Micro-Bleeds and Neuroinflammation in E19 Rat Fetuses Exposed to Utero-Placental Ischemia

Ashtin B Giambrone1, Omar C Logue2, Qingmei Shao1

  • 1Department of Neurology, University of Mississippi Medical Center, Jackson, MS 39216, USA.

International Journal of Molecular Sciences
|August 23, 2019
PubMed

Insights

Placental ischemia in pregnant rats caused fetal brain inflammation and micro-bleeds, increasing neurological deficit risk in offspring. This study links reduced placental perfusion to in utero brain injury.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Reproductive Medicine

Background:

  • Preeclampsia is linked to offspring neurological deficits.
  • Low placental perfusion is a common factor in preeclampsia and fetal growth restriction.
  • The direct impact of placental ischemia on fetal brain development is not fully understood.

Purpose of the Study:

  • To investigate if placental ischemia during pregnancy causes neuroinflammation and micro-hemorrhages in the fetus.
  • To establish a causative link between reduced placental perfusion and fetal brain injury.

Main Methods:

  • Timed-pregnant Sprague Dawley rats underwent either sham surgery or surgical reduction of utero-placental perfusion (RUPP) on gestational day 14.
  • Fetal brains were collected at embryonic day 19 for analysis.
  • Histological staining (H&E) and cytokine analysis were performed.

Main Results:

  • RUPP led to increased fetal demise and hematocrit but no change in fetal brain water content.
  • RUPP-exposed fetuses showed increased cerebral micro-bleeds and elevated pro-inflammatory cytokines (IL-1β, IL-6, IL-18) and chemokines (CCL11, CXCL5, CXCL2).
  • A decrease in microglial density was observed in the sub-ventricular zone of RUPP-exposed fetuses.

Conclusions:

  • Placental ischemia induces fetal brain microvascular dysfunction, evidenced by micro-bleeds.
  • In utero placental ischemia triggers fetal brain inflammation and alters microglial density.
  • These findings suggest placental ischemia contributes to neurodevelopmental abnormalities in offspring, potentially impacting long-term cognitive function.

Keywords:
cerebral cytokinesmicro-bleedsmicrogliapreeclampsia

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