Oxytocin Acetate CAS: 6233-83-6

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I. Core Structure & Key Traits

1. Molecular Composition
   
   
   Oxytocin Acetate features a cyclic structure formed by a disulfide bond between two cysteine residues at positions 1 and 6, with the amino acid sequence Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Leu-Gly-NH₂. The acetate salt modification enhances its water solubility and chemical stability, facilitating formulation into injectable preparations for clinical use.
2. Formulation & Storage
   
   
   It is typically supplied as a sterile, lyophilized white powder for parenteral administration. Reconstitute with sterile water or normal saline before use. For long-term preservation, store the lyophilized powder sealed at 2–8°C away from light; avoid repeated freeze-thaw cycles to prevent peptide degradation. The reconstituted solution should be used immediately to maintain biological activity.

II. Mechanisms of Action

1. Reproductive System Regulation
   
   
   Oxytocin binds to G-protein-coupled oxytocin receptors (OTRs) in uterine smooth muscle cells, triggering intracellular calcium release and promoting uterine contractions. During labor, it amplifies uterine contractility to facilitate parturition. In lactating women, it stimulates myoepithelial cell contraction in mammary glands, enabling milk ejection.
2. Social Behavior & Neuroregulation
   
   
   In the central nervous system, oxytocin modulates synaptic transmission and neural plasticity, influencing social bonding, trust, empathy, and stress response. It acts on brain regions including the amygdala and prefrontal cortex, reducing anxiety and enhancing social interaction, which has made it a focus of neuroscience research on social cognition.
3. Other Physiological Effects
   
   
   It regulates cardiovascular function by dilating blood vessels and reducing blood pressure, and also participates in gastrointestinal motility modulation and immune system regulation through peripheral receptor signaling.

III. Clinical Applications & Research Value

1. Obstetric & Gynecological Use
   • Induction/Augmentation of Labor: Administered intravenously to initiate or strengthen uterine contractions in full-term pregnancies with prolonged labor or medical indications for delivery.
   • Postpartum Hemorrhage Prevention: Reduces postpartum uterine atony and bleeding by promoting sustained uterine contractions after childbirth.
   • Lactation Support: Helps resolve milk ejection difficulties in lactating women by stimulating milk release.
   
   
2. Neuroscience & Psychology Research
   
   
   Studied for its potential in improving social function in conditions such as autism spectrum disorder (ASD) and schizophrenia. Clinical trials explore its therapeutic effects on anxiety disorders, post-traumatic stress disorder (PTSD), and social phobia by modulating the brain’s social reward pathway.
3. Veterinary Applications
   
   
   Used in livestock breeding to induce parturition, prevent postpartum hemorrhage, and promote milk secretion in dairy animals, improving reproductive efficiency.

IV. Dosage, Administration & Safety Profile

1. Clinical Dosage & Route
   • Labor Induction: Intravenous infusion starting at 0.5–1 mU/min, gradually titrated based on uterine contraction response.
   • Postpartum Hemorrhage: Intramuscular injection of 10–20 units after placental delivery; or intravenous bolus of 5–10 units for severe bleeding.
   • Research Use: Intranasal administration (10–40 IU per dose) is common for central nervous system studies, as it bypasses the blood-brain barrier to some extent.
   
   
2. Safety Characteristics
   • Common Adverse Reactions: Transient uterine hyperstimulation (resulting in fetal distress if excessive), nausea, vomiting, and flushing. These are usually dose-dependent and resolve with reduced infusion rate or discontinuation.
   • Contraindications: Prohibited in pregnancies with fetal distress, cephalopelvic disproportion, placenta previa, or a history of uterine surgery, as it may cause uterine rupture. Use with caution in patients with hypertension or cardiac disease.
   • Drug Interactions: Concurrent use with other uterotonic agents (e.g., prostaglandins) increases the risk of uterine hyperstimulation and should be avoided.