Related Experiment Video
Updated: Jul 19, 2026
09:30
Mouse in Utero Electroporation: Controlled Spatiotemporal Gene Transfection
Published on: August 15, 2011
Oxytocin gene expression in rat uterus.
D L Lefebvre1, A Giaid, H Bennett
1Laboratory of Molecular Endocrinology, Royal Victoria Hospital, McGill University, Montreal, Quebec, Canada.
Science (New York, N.Y.)
|June 12, 1992
Summary
Oxytocin (OT) is a potent labor induction agent, but its circulating levels don't increase during labor. Uterine OT production in rats significantly rises during pregnancy, suggesting local action rather than systemic effects.
Area of Science:
- Reproductive biology
- Endocrinology
- Molecular biology
Background:
- Oxytocin (OT) is a key hormone for labor induction.
- Circulating OT levels do not appear to increase during natural labor.
- A paradox exists regarding OT's role in parturition.
Purpose of the Study:
- To investigate the source of oxytocin (OT) during labor.
- To resolve the paradox of OT's role in parturition.
- To determine if the uterus produces its own OT.
Main Methods:
- Quantification of oxytocin (OT) messenger RNA (mRNA) and peptide in rat uterus and hypothalamus.
- Comparison of OT mRNA levels during different stages of gestation and at term.
Main Results:
- Oxytocin (OT) messenger RNA (mRNA) and peptide were detected in the rat uterus.
- Uterine OT mRNA levels increased over 150-fold during gestation.
- At term, uterine OT mRNA levels were 70-fold higher than hypothalamic OT mRNA levels.
Conclusions:
- The uterus is a significant source of oxytocin (OT) during parturition in rats.
- Oxytocin (OT) likely acts as a local mediator within the uterus during labor.
- This local action explains OT's potent uterotonic effects without requiring increased systemic circulation.
