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Horm Metab Res 1974; 6(4): 329-331
DOI: 10.1055/s-0028-1093840
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© Georg Thieme Verlag KG Stuttgart · New York

Diurnal Variations in Plasma Corticosterone and Cations of Male Rats on Two Lighting Schedules[*]

S. F. Marotta , D. M. Lanuza , L. G. Hiles
  • Departments of Physiology and General Nursing, University of Illinois at the Medical Center, Chicago, Illinois, USA
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Publication Date:
08 January 2009 (online)

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Abstract

Plasma corticosterone, Ca++, Mg++, Zn++ and Cu++ concentrations were determined at four hour intervals in male rats subjected to two different lighting schedules (12L:12D and 12D:12L). Although diurnal rhythms were observed in these cations when rats were on 12L:12D schedule, only at specific times did plasma Zn++and Cu++ appear to be related to plasma corticosterone levels; however, when the lighting schedule was reversed (12D:12L), a new diurnal rhythm in corticosterone, but not in plasma cations, was established. These data suggest that at physiologic concentrations corticosterone does not significantly influence the plasma levels of cations, nor do these cations affect plasma corticosterone levels.

Key words

Diurnal Corticosterone and Cations - Calcium - Magnesium - Zinc - Copper

1 Supported in part by internal grants of the University of Illinois and by the Office of Naval Research Contract NR 201-020. The authors are indebted to K.Pazderska for her excellent technical assistance.

1 Supported in part by internal grants of the University of Illinois and by the Office of Naval Research Contract NR 201-020. The authors are indebted to K.Pazderska for her excellent technical assistance.

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