Pineal noradrenaline levels in the monogolian gerbil and in different strains of laboratory rats over a lighting regimen

William W. Morgan, Russel J. Reiter

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Adult male Long Evans and Sprague-Dawley rats and Mongolian gerbils were sacrificed at 4 hour intervals over a 24 hour period. Pineal noradrenaline (NA) levels in these animals were determined by a radioisotopic procedure. Statistically significant circadian rhythms were observed in pineal NA content in both strains of rats but not in the gerbils. These data show that daily rhythms in pineal NA are a characteristic phenomenon observed in rats either with or without eye pigment. The absence of a daily rhythm in NA content in the gerbil pineal may explain the relatively low amplitude rhythm in N-acetyl transferase activity observed in this species compared to the rat.

Original languageEnglish (US)
Pages (from-to)555-558
Number of pages4
JournalLife Sciences
Issue number4
StatePublished - Aug 15 1977


ASJC Scopus subject areas

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

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