Assessment of GH releasing hormone activity in Sephadex separated fractions of porcine hypothalamic extracts by hypophyseal portal vessel infusion in the rat

J. Takahara, A. Arimura, A. V. Schally

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Growth hormone releasing hormone (GH RH) activity in Sephadex G 25 fractions of porcine stalk median eminence (SME) extracts was examined in vivo by infusing these samples into a rat hypophyseal portal vessel. The increment of immunoreactive GH levels in the serum was used as the index for GH RH activity. The GH RH activities were found in two different locations: in the early fractions Nos. 3 to 4, and in somewhat retarded fraction No. 7. These GH RH activities were not due to TRH (thyroid releasing hormone), vasopressin, or potassium. The location of luteinizing hormone releasing hormone (LH RH) and prolactin release inhibiting hormone (PR IH) determined in this in vivo system was in agreement with those found in other in vivo and in vitro assay systems for LH RH and PR IH, respectively. These results help validate this assay system.

Original languageEnglish (US)
Pages (from-to)428-434
Number of pages7
JournalActa endocrinologica
Volume78
Issue number3
DOIs
StatePublished - 1975

ASJC Scopus subject areas

  • Endocrinology

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