title: Significant dissociation of expression patterns of the basic helix-loop-helix transcription factors Dec1 and Dec2 in rat kidney.
abstract: Dec1 and Dec2 are regulators of the mammalian molecular clock that show robust circadian rhythms in the suprachiasmatic nucleus and various peripheral tissues. Although the expression of Dec1 and Dec2 is altered by multiple stimuli in different organs, their transcriptional regulatory mechanisms have not been fully elucidated for the kidney. In the present study, we describe for the first time significant dissociation of expression patterns with arrhythmic expression of Dec1 and rhythmic expression of Dec2 in rat kidney under a normal light-dark (LD) cycle. Daytime restricted feeding (RF) significantly altered the expression patterns of these two clock genes, and even induced circadian expression of Dec1 with an amplitude of 2.2 on day 3 and 4.2 on day 7. However, when a reversed feeding schedule was coupled with a reversed LD cycle, the expression of Dec1 but not Dec2 reverted to being arrhythmic. Moreover, exogenous injection of the glucocorticoid analogue dexamethasone (Dex) at certain times of the day resulted in rhythmic expression of Dec1, which was similar to that seen following RF for 7 days. In contrast, endogenous disruption of glucocorticoids by adrenalectomy abolished RF-induced rhythmic expression of Dec1 in the kidney. These observations suggest the existence of a glucocorticoid gating mechanism in the circadian expression of Dec1 in rat kidney.
authors: College of Biological and Environmental Engineering, Zhejiang University of Technology, Zhaohui Xincun, Hangzhou 310032, China.
authors: Tao
authors: T
authors: Wu
authors: Yinhua
authors: Y
authors: Ni
authors: Fen
authors: F
authors: Zhuge
authors: Lu
authors: L
authors: Sun
authors: Bin
authors: B
authors: Xu
authors: Hisanori
authors: H
authors: Kato
authors: Zhengwei
authors: Z
authors: Fu
mesh_terms: D000315:Adrenalectomy; D000818:Animals; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics / Q000378:metabolism*; D001683:Biological Clocks / Q000187:drug effects / Q000502:physiology; D002940:Circadian Rhythm / Q000187:drug effects / Q000502:physiology; D003907:Dexamethasone / Q000494:pharmacology; D005247:Feeding Behavior; D005786:Gene Expression Regulation / Q000187:drug effects; D005938:Glucocorticoids / Q000494:pharmacology; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism*; D007668:Kidney / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D009206:Myocardium / Q000378:metabolism; D017440:Photoperiod; D051381:Rats; D017208:Rats, Wistar
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; D003907:Dexamethasone; D005938:Glucocorticoids; D018398:Homeodomain Proteins; C491538:Bhlhe40 protein, rat; C109509:Bhlhe41 protein, rat