Melatonin and porphyrin in the harderian glands of the syrian hamster: Orcadian patterns and response to autumnal conditions

Gerald R. Buzzell, Andreas Pangerl, Brigitte Pangerl, Armando Menendez-Pelaez, Mary K. Vaughan, John C. Little, Steven M. Hill, George M. Vaughan, Russel J. Reiter

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

1. 1. Adult male Syrian hamsters were killed at nine intervals during a 24 hr period in the autumn, after 2 months either indoors in controlled conditions or in natural outdoor conditions. 2. 2. Harderian glands were taken for determination of N-acetyltransferase (NAT) and hydroxyindole-O-methyltransferase (HIOMT) activities and melatonin and porphyrin concentrations. 3. 3. Mean 24 hr Harderian NAT and melatonin values were lower outside than inside. 4. 4. Twenty-four hour melatonin rhythms were detected with similar daytime (afternoon) acrophases in both environmental conditions. 5. 5. An NAT rhythm was seen only in animals kept inside, with a circadian maximum in the late dark phase. 6. 6. Mean 24 hr HIOMT activity was slightly higher outdoors than indoors, and 24 hr rhythms were not detected in either condition. 7. 7. Mean porphyrin concentrations were higher outdoors, with 24 hr rhythms detected in both conditions and a significantly earlier nocturnal circadian maximum outdoors.

Original languageEnglish (US)
Pages (from-to)1465-1469
Number of pages5
JournalInternational Journal of Biochemistry
Volume22
Issue number12
DOIs
StatePublished - 1990

ASJC Scopus subject areas

  • Biochemistry

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