Immunocytochemical demonstration of day/night changes of clock gene protein levels in the murine adrenal gland: differences between melatonin-proficient (C3H) and melatonin-deficient (C57BL) mice.

Abstract:

:The circadian system comprises several peripheral oscillators and a central rhythm generator that, in mammals, is located in the suprachiasmatic nucleus of the hypothalamus. Expression of clock genes is a characteristic feature of the central rhythm generator and the peripheral oscillators. With regard to the rhythmic production of glucocorticoids, the adrenal gland can be considered as peripheral oscillator, but little is known about clock gene expression in this tissue. Therefore, the present study investigates the levels of three clock gene proteins PER1, BMAL1 and CRY2 in the murine adrenal cortex and medulla at seven different time points of a 12-hr light/12-hr dark cycle. To determine a potential role of melatonin we compared the patterns of clock gene proteins in the adrenal gland of melatonin-proficient mice (C3H) with those of melatonin-deficient mice (C57BL). In C3H mice, both, the adrenal cortex and medulla displayed day/night variation in PER1-, CRY2- and BMAL1-protein levels. PER1 and CRY2 peaked in the middle of the light phase, whereas BMAL1 peaked in the dark phase. This pattern was also observed in the adrenal medulla of C57BL, but in the adrenal cortex of C57BL clock gene protein levels did not change with time and were consistently lower than in C3H mice. These results support the hypothesis that the adrenal gland is a peripheral oscillator and raise the possibility that melatonin may be involved in the control of clock gene protein levels in the adrenal cortex of mice.

journal_name

J Pineal Res

authors

Torres-Farfan C,Serón-Ferré M,Dinet V,Korf HW

doi

10.1111/j.1600-079X.2005.00279.x

subject

Has Abstract

pub_date

2006-01-01 00:00:00

pages

64-70

issue

1

eissn

0742-3098

issn

1600-079X

pii

JPI279

journal_volume

40

pub_type

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