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Horm Metab Res 1977; 9(3): 231-234
DOI: 10.1055/s-0028-1093543
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© Georg Thieme Verlag KG Stuttgart · New York

Free Thyroxin Index in Normal, Melatonin-Treated and Blind Hamsters

J.  Vriend , R. J. Reiter
  • Department of Anatomy University of Texas Health Science Center, San Antonio, Texas, USA
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Publication Date:
23 December 2008 (online)

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Abstract

The administration of melatonin to young male hamsters depressed thyroxin levels, as measured by radioimmunoassay, by 38.5% of saline controls. Free thyroxin index was also significantly depressed by melatonin injections. The depression of thyroxin and free thyroxin index by melatonin injections was more effective in intact than in pinealectomized animals. Blinding of hamsters also reduced both thyroxin and free thyroxin index.

Key words

Melatonin - Free thyroxin index - Pineal gland