Oxytocin
approvedAlso known as: Pitocin, Syntocinon
**Mechanism of Action** Oxytocin is a nonapeptide hormone synthesized in the paraventricular and supraoptic nuclei of the hypothalamus and released from the posterior pituitary. It binds to oxytocin receptors (OXTR), a G-protein-coupled receptor, primarily in uterine myometrium and mammary gland myoepithelial cells, triggering phospholipase C activation and intracellular calcium release, leading to smooth muscle contraction. In the central nervous system, oxytocin modulates social behavior via OXTR in limbic regions (e.g., amygdala, nucleus accumbens), influencing pair bonding, trust, and emotional recognition. **Key Research Findings** Over 29,000 PubMed-indexed studies support oxytocin’s dual roles. Clinically, synthetic oxytocin (Pitocin, Syntocinon) is FDA-approved for labor induction and postpartum hemorrhage via intravenous administration. Intranasal oxytocin research shows enhanced social cognition, including improved eye gaze, emotion recognition, and trust in healthy adults, with mixed results in autism spectrum disorder (ASD) and schizophrenia. Meta-analyses indicate modest effect sizes for social functioning, but replication challenges and dose-response variability persist. **Clinical Relevance** Oxytocin remains a cornerstone in obstetrics for uterine contraction management. Intranasal formulations are investigational for psychiatric conditions, though no regulatory approval exists for social cognition indications. Off-label use is cautioned due to inconsistent efficacy and potential adverse effects (e.g., hyponatremia, uterine hyperstimulation). Ongoing trials explore chronic dosing in ASD and social anxiety. For research purposes only — not medical advice.
Key data
C43H66N12O12S2Research & studies
Oxytocin is released in pulses during labor, with increasing frequency and amplitude in the first and second stages.; Synthetic oxytocin infusion at 20-30 mIU/min increases plasma oxytocin 2- to 3-fold above basal levels.; High-dose oxytocin shortens labor by up to 2 hours but does not reduce cesarean delivery rates.; Postpartum oxytocin bolus (5-10 IU) prevents hemorrhage by inducing uterine contractility and placental expulsion.
Frequently asked questions
What is Oxytocin?
**Mechanism of Action** Oxytocin is a nonapeptide hormone synthesized in the paraventricular and supraoptic nuclei of the hypothalamus and released from the posterior pituitary. It binds to oxytocin receptors (OXTR), a G-protein-coupled receptor, primarily in uterine myometrium and mammary gland myoepithelial cells, tr
How does Oxytocin work?
Nonapeptide posterior pituitary hormone driving uterine contraction and milk letdown; studied intranasally for social cognition.
What is the research status of Oxytocin?
Oxytocin is currently classified as approved, with 29,031 research references on record. This is for research purposes only and is not medical advice.
What is the half-life of Oxytocin?
The reported half-life of Oxytocin is 1-6 minutes.
What is the molecular weight of Oxytocin?
Oxytocin has a molecular weight of approximately 1007.2 g/mol (formula C43H66N12O12S2).
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