Synthesis, purification and biological evaluation of porcine corticotropin-releasing factor

J. Guoth, D. B. Olsen, M. Kovacs, A. V. Schally

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

The 41-residue sequences of recently identified porcine corticotropin-releasing factors [I1e40]pCRF and [Asn40]pCRF were assembled on a benzhydrylamine resin support. Deprotection and cleavage from the resin were accomplished by HF treatment. The crude peptides were purified by HPLC. The homogeneity of the final materials, obtained in 0.2% and 0.4% overall yield for [I1e40]pCRF and [Asn40]pCRF respectively, was assessed after the isolation by HPLC and amino acid analysis. Both sequences of the synthetic 41-residue pCRF stimulated the release of corticotropin (ACTH) from superfused rat pituitary cells on a column, the responses being related to a log-dose of CRF in the range of 1-20 ng/ml. [I1e40]pCRF and [Asn40]pCRF also augmented the in vivo release of ACTH in rats pretreated with chlorpromazine, morphine and Nembutal. [I1e40]pCRF appeared to be equipotent to ovine CRF and about twice as active as [Asn40]pCRF. The data indicate that synthetic porcine [I1e40]pCRF and [Asn40]pCRF have high biological activity.

Original languageEnglish (US)
Pages (from-to)1003-1010
Number of pages8
JournalLife Sciences
Volume41
Issue number8
DOIs
StatePublished - Aug 24 1987
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology, Toxicology and Pharmaceutics(all)

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