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Design, synthesis and bioassays of antagonists of LHRH which have high antiovulatory activity and release negligible histamine.

Authors
  • Ljungqvist, A
  • Feng, D M
  • Tang, P F
  • Kubota, M
  • Okamoto, T
  • Zhang, Y W
  • Bowers, C Y
  • Hook, W A
  • Folkers, K
Type
Published Article
Journal
Biochemical and biophysical research communications
Publication Date
Oct 29, 1987
Volume
148
Issue
2
Pages
849–856
Identifiers
PMID: 2446602
Source
Medline
License
Unknown

Abstract

Potent antagonists of the luteinizing hormone releasing hormone have been achieved which release negligible histamine. [N-Ac-D-2-Nal1, D-pClPhe2, D-3-Pal3, NicLys5, D-NicLys6, ILys8, D-Ala10]-LHRH showed 100%AOA/1 microgram and 36%/0. 5 micrograms; ED50 greater than 300. [N-Ac-D-2-Nal1,D-pClPhe2,D-3-Pal3, PicLys5, D-PicLys6, ILys8, D-Ala10]-LHRH showed 100% AOA/0.5 micrograms and 40%/0.25 micrograms; ED50, 93 +/- 11, and is the most potent of 52 new peptides. These antagonists feature designs with weakly basic acylated D-Lys6, notably D-NicLys6 and D-PicLys6 and alkylated Lys8 or Orn8, e.g., ILys8 and IOrn8, and NicLys5 and PicLys5. Concepts included balanced overall basicity, superiority of ILys8 and IOrn8 which are sequence dependent and sensitivity of positions 5 and 6 for potency.

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