Harderian Glands of Golden Hamsters: Temporal and Sexual Differences in Immunoreactive Melatonin

Roger A. Hoffman, Lucinda B. Johnson, Russel J. Reiter

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

Throughout a 24‐h period, immunoreactive melatonin concentrations in Harderian glands of female golden hamsters were approximately 200 pg/mg protein with a significant decline to 80 pg/mg protein only at about 0600, 2 h after light on. Concentrations in glands of males are diurnally constant and low (ca. 20 pg/mg protein). Castration increases immunoreactive melatonin in glands of males to female levels. While blinding alone had no effect, it did prevent the castration‐induced increase. Lower conentrations were measured in glands of blinded or blinded ovariectomized females but this decrease was not significant. These data suggest that immunoreactive melatonin concentrations in the Harderian glands of hamsters are controlled by testosterone or its derivatives; these same factors also control the male or female character of these glands.

Original languageEnglish (US)
Pages (from-to)161-168
Number of pages8
JournalJournal of pineal research
Volume2
Issue number2
DOIs
StatePublished - Apr 1985

Keywords

  • Harderian gland
  • hamster
  • immunoreactive melatonin
  • photic input
  • rhythm
  • sexual dichotomy

ASJC Scopus subject areas

  • Endocrinology

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