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Prolactin-dependent seasonal changes in pelage: Role of the pineal gland and dopamine

✍ Scribed by Badura, Lori L. ;Goldman, Bruce D.

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
623 KB
Volume
261
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

The Siberian hamster displays seasonal changes in pelage that are dependent upon fluctuations in circulating prolactin levels. Pinealectomy prevented the decrease in serum prolactin and molt to the winter pelage displayed by castrated males housed under a short‐day photoperiod. A dopaminergic antagonist, pimozide, enhanced prolactin levels in both pinealectomized and shamoperated animals under both long and short photoperiods. In the short‐day animals, this effect of pimozide was associated with a prevention of the development of winter pelage. These results indicate that seasonal prolactin levels and related pelage changes are dependent upon the integrity of the pineal gland. However, basal prolactin levels under different photoperiod conditions appear to be only partly regulated by the actions of the dopaminergic system.

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