Methods for using LHRH antagonists with low histamine release

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Peptide containing doai

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530313, 530328, A61K 3824, A61K 3804, C07K 723

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active

057634041

ABSTRACT:
Antide is the decapeptide, N-Ac-D-2-Nal,D-pClPhe, D-3-Pal, Ser,NicLys, D-NicLys, Leu, ILys, Pro, D-Ala,NH.sub.2 which is an antagonist of luteinizing hormone releasing hormone (LHRH). This decapeptide, like others of the present invention, has high antiovulatory activity (AOA) and releases negligible histamine. Antide is scheduled for scale-up, safety testing and evaluation in the experimental primate and in clinical medicine. Numerous other peptides having structures related to Antide were prepared and tested. These peptides had variations primarily in positions 5, 6, 7, and 8. Of these, N-Ac-D-2-Nal, D-pClPhe,D-3-Pal,Ser,PicLys,cis-DPzACAla,Leu,ILys,Pro,D-Ala-NH.sub.2 was one of the most potent and had higher antiovulatory activity than Antide, i.e. 73%/0.25 ug and 100%/0.5 ug vs. 36%/0.5 ug and 100%/1.0 ug. Antide showed significant, (p<0.001) duration of action, when injected at a dose Antide showed oral AOA at 600 ug (73%) and at 1200 ug (100%) with negligible difference being found between water and corn oil oral formulations.
In the antagonists prepared according to the present invention, arginine and its derivatives were not utilized. Lysine was converted into derivatives with acyl groups or with alkyl groups on the E-amino group. The amino acid ornithine was acylated or alkylated on the d-amino group. Both the L- and D- forms of lysine and the L-form of ornithine were used in synthesizing these acyl and alkyl derivatives. Structurally related intermediates were also synthesized. All together, many new peptides were synthesized by the basic and minimal concepts of ten variables for anti-ovulation activity and ten variables for histamine release, which may be independent or partially overlapping. On such a basis, the number of such peptides that can be designed becomes overwhelming, and every reasonable priority must be considered to reduce the number of peptides to be synthesized in the hope that a discovery will be realized.

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