Intrauterine growth restriction and hyperoxia as a cause of white matter injury

Jill L Chang, Mirrah Bashir, Christiana Santiago, Kathryn Farrow, Camille Fung, Ashley S Brown, Robert W Dettman, Maria L V Dizon

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Intrauterine growth restriction (IUGR) is estimated to occur in 5% of pregnancies, with placental insufficiency being the most common cause in developed countries. While it is known that white matter injury occurs in premature infants, the extent of IUGR on white matter injury is less defined in term infants. We used a novel murine model that utilizes a thromboxane A 2 (TXA 2 ) analog (U46619), a potent vasoconstrictor, to induce maternal hypertension and mimic human placental insufficiency-induced IUGR to study the white matter. We also investigated the role of hyperoxia as an additional risk factor for white matter injury, as IUGR infants are at increased risk of respiratory comorbidities leading to increased oxygen exposure. We found that TXA 2 analog-induced IUGR results in white matter injury as demonstrated by altered myelin structure and changes in the oligodendroglial cell/oligodendrocyte population. In addition, our study demonstrates that hyperoxia exposure independently results in white matter perturbation. To our knowledge, this is the first study to report single and combined effects of IUGR with hyperoxia impacting the white matter and motor function. These results draw attention to the need for close monitoring of motor development in IUGR babies following hospital discharge as well as highlighting the importance of limiting, as clinically feasible, the degree of oxygen overexposure to potentially improve motor outcomes in this population of infants.

Original languageEnglish (US)
Pages (from-to)344-357
Number of pages14
JournalDevelopmental Neuroscience
Volume40
Issue number4
Early online dateNov 14 2018
DOIs
StatePublished - Dec 1 2018

Keywords

  • Hyperoxia
  • Intrauterine growth restriction
  • Oligodendrocytes
  • White matter injury

ASJC Scopus subject areas

  • Neurology
  • Developmental Neuroscience

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