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Effects of lighting conditions and of hormone replacement on the level of porphyrins in the rat Harderian gland

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Abstract

The effects of lighting conditions and/or gonadal secretions on the porphyrins of rat Harderian glands were studied. In female rats, exposure to constant light (=LL) induced a 50% decrease of porphyrin in the Harderian gland. Ovariectomy in these animals caused an increase to levels comparable to those found in intact controls. In males, exposure to constant darkness (= DO) produced a marked increase in the glandular porphyrins together with greatly decreased weights of accessory sexual organs. Further, orchidectomy remarkably increased porphyrin levels in rats kept under conditions of LL or DD. Administration of testosterone propionate to castrated male rats significantly decreased the porphyrin contents in the gland, although estradiol benzoate and progesterone treatments had no effect on the levels. Similar results were obtained in female rats.

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Shirama, K., Kohda, M. & Hokano, M. Effects of lighting conditions and of hormone replacement on the level of porphyrins in the rat Harderian gland. J Endocrinol Invest 10, 79–82 (1987). https://doi.org/10.1007/BF03347160

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  • DOI: https://doi.org/10.1007/BF03347160

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