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Oxidative stress causes vascular dysfunction in the placenta.

L Myatt1, W Kossenjans, R Sahay

  • 1Department of Obstetrics and Gynecology, University of Cincinnati College of Medicine, Ohio 45267-0526, USA. Leslie.Myatt@UC.EDU

The Journal of Maternal-Fetal Medicine
|April 11, 2000
PubMed
Summary
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Oxidative stress from peroxynitrite formation in the placenta impairs vascular function in preeclampsia and diabetes. This vascular dysfunction may compromise fetal blood flow and development.

Area of Science:

  • Obstetrics and Gynecology
  • Perinatal Medicine
  • Vascular Biology

Background:

  • Oxidative stress, marked by peroxynitrite, is implicated in placental vascular dysfunction.
  • Nitrotyrosine residues, a marker of peroxynitrite, are present in preeclamptic and diabetic pregnancies.

Purpose of the Study:

  • To investigate the causal role of peroxynitrite in placental vascular dysfunction.
  • To compare placental vascular responses in normal, preeclamptic, and diabetic pregnancies.

Main Methods:

  • In vitro treatment of placental vasculature with peroxynitrite.
  • Assessment of vascular responses to vasoconstrictors (U46619) and vasodilators (glyceryl trinitrate, prostacyclin).
  • Comparison of placental vascular reactivity between normal, preeclamptic, and diabetic pregnancies.

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Main Results:

  • Peroxynitrite exposure in vitro attenuated placental vascular responses to both vasoconstrictors and vasodilators.
  • Placental vasculature from preeclamptic and diabetic pregnancies showed significantly attenuated responses compared to normal controls.
  • Nitrotyrosine presence confirmed peroxynitrite formation in preeclamptic and diabetic placentas.

Conclusions:

  • Peroxynitrite formation and action are strongly linked to placental vascular dysfunction in preeclampsia and diabetes.
  • Impaired placental vascular responsiveness may hinder adequate blood flow adjustments, potentially compromising fetal well-being.
  • This study suggests a mechanism for fetal compromise in complicated pregnancies due to oxidative stress.