Cyclic CRF analogs

Chemistry: natural resins or derivatives; peptides or proteins; – Peptides of 3 to 100 amino acid residues – Corticotropin ; related peptides

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530317, 530324, 930DIG570, C07K 14695

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active

054930065

ABSTRACT:
Improved CRF peptide antagonists have the formula: ##STR1## wherein R.sub.20 is Cys or Glu; R.sub.23 is Cys, Lys or Orn; provided that when R.sub.20 is Cys, R.sub.23 is Cys and when R.sub.20 is Glu, R.sub.23 is Lys or Orn; or a nontoxic addition salt thereof. Specific CRF antagonists disclosed include (cyclo 20-23) [D-Phe.sup.12, Lys.sup.23, Nle.sup.21,38, ]rCRF(12-41); (cyclo 20-23) [D-Phe.sup.12, Orn.sup.23, Nle.sup.21,38 ]rCRF(12-41) and (cyclo 20-23) [D-Phe.sup.12, Cys.sup.20, Cys.sup.23, Nle.sup.21,38 ]rCRF(12-41).

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