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Related Experiment Video

Updated: Sep 13, 2025

Author Spotlight: Modeling an Aspect of Preeclampsia in Female Mice Using Hypoxic Human Placenta-Derived Small Extracellular Vesicles
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Author Spotlight: Modeling an Aspect of Preeclampsia in Female Mice Using Hypoxic Human Placenta-Derived Small Extracellular Vesicles

Published on: January 26, 2024

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Relationships Between H2S and OT/OTR Systems in Preeclampsia.

Tamara Merz1,2, Sarah Ecker1,2,3, Nicole Denoix1

  • 1Institute for Anesthesiological Pathophysiology and Process Engineering, Ulm University Medical Center, 89081 Ulm, Germany.

Antioxidants (Basel, Switzerland)
|July 29, 2025
PubMed
Summary

This study suggests the hydrogen sulfide (H2S) and oxytocin (OT) systems interact in pre-eclampsia (PE) pathophysiology. Findings indicate altered H2S and OT receptor expression in the placenta may contribute to PE, potentially via impaired antioxidant defense.

Keywords:
cystathionine-β-synthasecystathionine-γ-lyaseheme-oxygenase 1homocysteineoxidative stress

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Area of Science:

  • Obstetrics and Gynecology
  • Biochemistry
  • Pathophysiology

Background:

  • Pre-eclampsia (PE) is a serious hypertensive disorder in pregnancy.
  • Oxidative stress is a suspected contributor to PE development.
  • Both hydrogen sulfide (H2S) and oxytocin (OT) systems possess antioxidant and hypotensive properties, suggesting a potential role in PE.

Purpose of the Study:

  • To investigate the interaction between the OT and H2S systems in the context of pre-eclampsia.
  • To compare uncomplicated pregnancies with early-onset PE (ePE) and late-onset PE (lPE).

Main Methods:

  • The NU-HOPE clinical case-control study collected routine data, serum H2S and homocysteine levels.
  • Placental tissue protein expression of H2S enzymes and OT receptor, and myometrial nitrotyrosine formation were analyzed.

Main Results:

  • Plasma sulfide levels remained unchanged across groups.
  • Homocysteine levels were significantly elevated in ePE but not lPE.
  • Placental expression of H2S enzymes and OT receptor was significantly increased in lPE.
  • Nitrotyrosine formation was significantly elevated in the lPE myometrium.

Conclusions:

  • The interaction of endogenous H2S and OT/OTR systems plays a role in PE pathophysiology.
  • Impaired antioxidant protection may be a key mechanism linking these systems to PE.