Receptor binding of oxytocin and vasopressin antagonists and inhibitory effects on isolated myometrium from preterm and term pregnant women
Abstract
OBJECTIVE: To test binding affinities for, and inhibitory effects on, myometrium of some oxytocin and vasopressin antagonists with respect to their therapeutic potential. DESIGN: Receptor binding studies on transfected cell lines. In vitro contractility studies of human myometrium. SETTING: The Research Laboratory of Sanofi Recherche, Centre de Toulouse, France and the Departments of Obstetrics and Gynecology, Lund University Hospital, Sweden and Bialystok University Hospital, Poland. PARTICIPANTS: Nine women delivered by caesarean section preterm and 37 delivered at term for routine obstetric indications. INTERVENTIONS: The binding affinities of oxytocin, arginine vasopressin, atosiban (1-deamino-2-D-Tyr(OEt)-4-Thr-8-Om-oxytocin), SR 49059 and SR 121463 for the human oxytocin and different subtypes of vasopressin receptors were determined. Concentration-response curves with oxytocin and arginine vasopressin were recorded on myometrium from preterm- and term-delivered women in control experiments and in the presence of 2.5 and 10 nmol/L of SR 49059. Furthermore, using term myometrium, the influence of SR 49059 and SR 121463 in concentrations of 3, 10, 30 and 100 nmol/L on responses to the EC50 concentrations of oxytocin and vasopressin were compared. MAIN OUTCOME MEASURES: Receptor binding affinities. In vitro contractile effects and their inhibitions. RESULTS: Oxytocin had a high affinity for the oxytocin receptor (K(i) in mean = 6.8 nmol/L) and bound, to some extent, to the vasopressin V1a receptor (K(i) = 34.9 nmol/L). Vasopressin displayed higher affinities for vasopressin V1a, V1b and V2 receptors (K(i) = 1.4, 0.8 and 4.2 nmol/L, respectively) than for the oxytocin receptor (K(i) = 48 nmol/L). Atosiban and SR 49059 both had a high affinity for the vasopressin V1a receptor (K(i) = 4.7 and 7.2 nmol/L, respectively, and a moderate one for the oxytocin receptor (K(i) = 397 and 340 nmol/L, respectively). SR 121463 exerted a predominant binding to the V2 receptor (K(i) = 3.0 nmol/L). In the concentration-response experiments levels of up to 10 nmol/L of SR 49059 had no influence on the effect of oxytocin on myometrium from women preterm and at term pregnancy. However, a concentration-dependent inhibition of the responses of both these type of tissues to vasopressin was seen. The effects of EC50 concentrations of oxytocin and vasopressin on term pregnant myometrium were markedly inhibited by 10 nmol/L and higher concentrations of SR 49059, the inhibition of the response to vasopressin being more pronounced than that of the oxytocin response. SR 121463 at maximal concentration only caused slight inhibitions of the oxytocin and vasopressin responses. CONCLUSIONS: Atosiban and SR 49059 both have moderate binding affinities for the human oxytocin receptor and high binding affinities for the vasopressin V1a one. We demonstrated that SR 49059 inhibits the response of term myometrium to oxytocin and that of both preterm and term myometrium to vasopressin. These observations suggest a therapeutic potential of SR 49059 in preterm labour. The vasopressin V2 receptor is apparently not involved to any significant degree in the activation of the pregnant human uterus.
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Uterine contractions induced by OT or AVP are largely mediated by OTRs.
“Uterine contractions induced by OT or AVP are largely mediated by OTRs [46; 47; 48].”
From Cross-talk among oxytocin and arginine-vasopressin receptors: Relevance for basic and clinical studies of the brain and periphery (2018) · cites this paper as [47]
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- Authors
- Åkerlund, M., Bossmar, T., Brouard, R., Kostrzewska, A., Laudanski, T., Lemancewicz, A., Gal, C. S., & Steinwall, M.
- Affiliations
- Skåne University Hospital (SE)
- Sanofi (France) (FR)
- University Clinical Hospital In Bialystok (PL)
- Corresponding author
- Åkerlund, Mats
- ORCID
- Bossmar, Thomas
- Venue
- BJOG: An International Journal of Obstetrics & Gynaecology
- Publisher
- Wiley
- Published
- 1999-10
- Volume
- 106
- Issue
- 10
- Pages
- 1047-1053
- ISSN
- 0306-5456 (ISSN-L)
- 1470-0328
- 1471-0528
- OpenAlex
- W1999186303
- Cited by
- 123
- References
- 18
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 3 · 2023: 4 · 2022: 5 · 2021: 6 · 2020: 8 · 2019: 5 · 2018: 10 · 2017: 4 · 2016: 4 · 2015: 2 · 2014: 10 · 2013: 3 · 2012: 5
- FWCI
- 4.82
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- BJOG An International Journal of Obstetrics & Gynaecology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
- Health Sciences › Medicine › Epidemiology › Preterm Birth and Chorioamnionitis
- Health Sciences › Medicine › Obstetrics and Gynecology › Maternal and Perinatal Health Interventions
- Keywords
- oxytocin receptor, vasopressin V1a receptor, oxytocin antagonist, vasopressin receptor antagonists, atosiban, uterine contractility, preterm labor, term pregnancy, receptor binding affinity, vasopressin
- MeSH terms
- Arginine Vasopressin, Cell Line, Cesarean Section, Female, Hormone Antagonists, Humans, Indoles, Obstetric Labor, Premature, Morpholines, Myometrium, Oxytocin, Pregnancy, Pyrrolidines, Spiro Compounds, Vasopressins, Receptors, Oxytocin, Antidiuretic Hormone Receptor Antagonists
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