Correlations of plasma growth hormone with somatostatin, gonadal steroid hormones and thyroid hormones in rainbow trout during sexual recrudescence

Alison C. Holloway, Mark A. Sheridan, Glen Van Der Kraak, John F. Leatherland

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

The study explores the interrelationships among growth hormone (GH), somatostatin-14 (SRIF), non-esterified fatty acids (NEFA), gonadal steroid hormones and thyroid hormones (THs) in sexually recrudescent rainbow trout (Oncorhynchus mykiss) to examine aspects of the complex set of physiological changes associated with gonadal growth and maturation. Females exhibited significant decreases in plasma SRIF, NEFA and triiodo-L-thyronine (T3) concentrations, and a significant increase in plasma GH concentration associated with gonadal maturation, whereas in males, only SRIF and NEFA concentrations showed significant changes during testicular maturation. The declining SRIF levels during gonadal recrudescence may indicate a role for the hormone in the energy repartitioning processes that occur in both sexes at this time. Correlation analysis of plasma variables revealed a direct correlations between plasma NEFA and 17β-estradiol (E2) in females, an inverse correlation between NEFA and testosterone (T) in males, inverse correlations between GH and SRIF in both males and females, and inverse correlations between THs and SRIF concentrations in females. These marked gender differences in correlations likely reflect the different physiological challenges faced by the two sexes and emphasizes the need to consider gender, as well as maturity when studying the interactions of hormones. Copyright (C) 1999 Elsevier Science Inc.

Original languageEnglish
Pages (from-to)251-260
Number of pages10
JournalComparative Biochemistry and Physiology - B Biochemistry and Molecular Biology
Volume123
Issue number3
DOIs
StatePublished - 1999

Keywords

  • 17β-estradiol
  • Gonadal growth
  • Gonadosomatic index
  • Gonadotropin II
  • L-thyroxine
  • Non-esterified fatty acid
  • Oncorhynchus mykiss
  • Testosterone
  • Triiodo-L-thyronine
  • Vitellogenin I

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