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CP8668, a novel orally active nonsteroidal progesterone receptor modulator with tetrahydrobenzindolone skeleton.

Abstract
We investigated progestational activity of a new nonsteroidal compound, CP8668, ((4aR,5R,6R,7R)-7-methoxy-6-(N-propylaminocarbonyl)oxy-4a,5,6,7-tetrahydro-1,3,4a,5-tetramethylbenz[f]indol-2(4H)-one). CP8668 showed selective affinity for human progesterone receptor equal in strength to other steroidal progestins. CP8668 showed no significant affinity for human glucocorticoid receptor or human estrogen receptor and very weak affinity for rat androgen receptor. In endogenous and exogenous progesterone-dependent enzyme expression assays using human mammary carcinoma T47D, CP8668 showed mixed agonist-antagonist activity. However, in a rabbit endometrial transformation test, CP8668 showed good progestational activity following s.c. and p.o. administration. These results suggest that CP8668 is a selective and orally active progesterone receptor modulator, which shows mixed agonist-antagonist activity in in vitro transcription tests and agonist activity in endometrial transformation assays in rabbits, and that it is potentially a promising lead compound for a new type of orally active progesterone receptor modulator.
AuthorsYuji Tabata, Yumiko Iizuka, Rie Shinei, Ken-ichi Kurihara, Tsuneo Okonogi, Shigeru Hoshiko, Yasushi Kurata
JournalEuropean journal of pharmacology (Eur J Pharmacol) Vol. 461 Issue 1 Pg. 73-8 (Feb 07 2003) ISSN: 0014-2999 [Print] Netherlands
PMID12568918 (Publication Type: Journal Article)
Chemical References
  • (4aR,5R,6R,7R)-7-methoxy-6-(N-propylaminocarbonyl)oxy-4a,5,6,7-tetrahydro-1,3,4a,5-tetramethylbenz(f)indol-2(4H)-one
  • Indoles
  • Receptors, Progesterone
  • Alkaline Phosphatase
Topics
  • Administration, Oral
  • Alkaline Phosphatase (metabolism)
  • Animals
  • Dose-Response Relationship, Drug
  • Endometrium (drug effects)
  • Female
  • Humans
  • In Vitro Techniques
  • Indoles (administration & dosage, chemistry, pharmacology)
  • Injections, Subcutaneous
  • Rabbits
  • Radioligand Assay
  • Receptors, Progesterone (agonists, antagonists & inhibitors, metabolism)
  • Tumor Cells, Cultured

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