L-368,899, a potent orally active oxytocin antagonist for potential use in preterm labor
Abstract
Abstract L‐368,899 [1S‐(‐7,7‐dimethyl‐2‐endo‐(2S‐amino‐4‐(methylsulfonyl)butyramido)‐bicyclo(2.2.1)‐heptan‐1‐yl)methanesulfonyl)‐4‐(2‐methylphenyl)piperazine] was characterized in vitro and in vivo as a potent and selective, orally bioavailable oxytocin (OT) antagonist. L‐368,899 exhibits high affinity for rat (Ki, 3.6 nM) and human (Ki, 13 nM) uterine OT receptors with selectivity versus liver arginine‐vasopressin (AVP)‐V1 and kidney AVP‐V2 receptors in both species. In vitro, L‐368,899 is a potent and competitive OT antagonist in the rat isolated uterus (pA2, 8.9) and mouse anococcygeus muscle (pA2, 8.3) and is inactive against a number of different contractile agents in these preparations. L‐368,899 also inhibits OT‐stimulated phosphatidylinositol turnover in rat uterine slices and exhibits no agonist‐like activity in any of the in vitro assays. In vivo, L‐368,899 selectively antagonizes the uterine contractile effects of OT in the anesthetized rat given both i.v. and intraduodenally (i.d.) (AD50; 350 μg/kg i.v., 7 mg/kg i.d.) with a moderate duration of action. In near‐term pregnant rhesus macaques, L‐368,899 is a potent inhibitor of OT‐stimulated uterine activity (AD50, 27 μg/kg i.v.) and OT‐mediated spontaneous, nocturnal uterine contractions. L‐368,899 is orally bioavailable in several species and, combined with adequate aqueous solubility, represents a potential new tocolytic agent for both oral and i.v. use. © 1993 wiley‐Liss, Inc.
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L-368,899 readily passes through the brain-blood barrier.
“which readily passes through the brain-blood barrier (18, 19).”
From Oxytocin receptors in the anteromedial bed nucleus of the stria terminalis promote stress-induced social avoidance in female California mice (2018) · cites this paper as [19]
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- Authors
- Pettibone, D. J., Clineschmidt, B. V., Guidotti, M. T., Lis, E. V., Reiss, D. R., Woyden, C. J., Bock, M. G., Evans, B. E., Freidinger, R. M., Hobbs, D. W., Veber, D. F., Williams, P. D., Chiu, S. ‐. L., Thompson, K. L., Schorn, T. W., Siegl, P. K. S., Kaufman, M. J., Cukierski, M. A., Haluska, G. J., Cook, M. J., & Novy, M. J.
- Affiliations
- Merck & Co., Inc., Rahway, NJ, USA (United States) (US)
- Oregon National Primate Research Center (US)
- Corresponding author
- Pettibone, D. J.
- Venue
- Drug Development Research
- Publisher
- Wiley
- Published
- 1993-11
- Volume
- 30
- Issue
- 3
- Pages
- 129-142
- ISSN
- 0272-4391 (ISSN-L)
- 1098-2299
- OpenAlex
- W1981764195
- Cited by
- 43
- References
- 42
- Citations by year
- 2024: 1 · 2022: 2 · 2021: 1 · 2017: 2 · 2015: 3 · 2014: 1 · 2013: 1 · 2012: 1
- FWCI
- 2.63
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Drug Development Research (publishedVersion)
- Topics
- Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
- Health Sciences › Medicine › Epidemiology › Preterm Birth and Chorioamnionitis
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
- Keywords
- L-368,899, oxytocin antagonist, tocolytic agents, preterm labor, oral bioavailability, intraduodenal administration, phosphatidylinositol turnover, uterine contractility
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