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Structure-activity studies of reduced-size gonadotropin-releasing hormone agonists derived from the sequence of an endothelin antagonist.

Abstract：

:We have previously determined that Ac-D-Trp-Leu-Asp-Ile-Ile-Trp (peptide I), an endothelin antagonist, binds specifically (Ki = 1.9 microM) to the rat pituitary gonadotropin-releasing hormone (GnRH) receptor. Moreover, peptide I exhibits a GnRH agonistic activity, mediated directly by the GnRH receptor. We now report structure-activity studies of peptide I in respect to its interactions with the GnRH receptor. Our studies suggest that the bioactive conformation of peptide I, recognized by the GnRH receptor, is of a cyclic nature. Thus cyclic analogues of peptide I exhibit higher affinity to the GnRH receptor and increased agonistic potencies as compared to peptide I itself. A linear peptide, Ile-Ile-Trp-D-Trp-Leu-Asp, which presumably forms a similar cyclic conformation, was also shown to be a GnRH agonist. Intraperitoneal administration of Ac-Ile-Ile-Trp-D-Trp-Leu-Cys-OH (Ki = 0.32 microM), one of the cyclic hexapeptides that we have synthesized, to rats induces secretion of luteinizing hormone (LH) with a potency which is only 1 order of magnitude less than that of GnRH itself. Moreover, plasma levels of LH remained elevated for a longer period of time following the administration of the cyclic hexapeptide. This novel class of GnRH agonists may prove useful in the development of new therapeutics.

journal_name

J Med Chem

journal_title

Journal of medicinal chemistry

authors

Yahalom D,Rahimipour S,Koch Y,Ben-Aroya N,Fridkin M

doi

10.1021/jm990432o

keywords:

subject

Has Abstract

pub_date

2000-07-27 00:00:00

pages

2824-30

issue

15

eissn

0022-2623

issn

1520-4804

pii

jm990432o

journal_volume

43

pub_type

杂志文章

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