Thyroid stimulating and pigmentary effects of synthetic peptides related to α-MSH and ACTH

A. V. Schally, A. J. Kastin, T. W. Redding, C. Y. Bowers, H. Yajima, K. Kubo

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Seven synthetic peptides related to α-MSH and ACTH and eleven stereoisomeric fragments of α-MSH (sequence 6-10) were tested for their thyroid stimulating effects. This TSH-like activity was determined by following 131I release in mice injected with 131I and treated with thyroxine. N-α-acetyl-β-corticotropin-(1-24)-tetracosapeptide and β-corticotropin-(1-24)-tetracosapeptide hydrazide had the highest MSH activity and elicited the greatest effects on the blood levels of 131I. The α-MSH-(7-13)-heptapeptide which had a moderate MSH activity, also caused a significant stimulation of 131I release in mice. On the other hand, β-corticotropin-(11-24)-tetradecapeptide, which had virtually no MSH activity, possessed some TSH-like activity. D-His-D-Phe-D-Arg-D-Trp-Gly and the analogous L-pentapeptide, which were essentially free of MSH activity, had no effect on the thyroid at doses up to 100 μg. per mouse. Seven MSH-ACTH stereoisomers, which individually assayed up to 1,200 MSH U/mg., similarly had no effect on the thyroid, but L-His-D-Phe-L-Arg-L-Trp-Gly and three stereoisomers which had a low but definite MSH activity, did exert some TSH-like effects. These studies reveal that, although some relationship between MSH and TSH-like activity can be observed among peptides of the MSH-ACTH group, there is no definite correlation between these activities.

Original languageEnglish (US)
Pages (from-to)824-829
Number of pages6
Issue number9
StatePublished - Sep 1967
Externally publishedYes

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology


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