[No authors listed]
The suprachiasmatic nuclei in the mammalian brain function as the regulators of circadian rhythm and coordinate the peripheral oscillators. Losses of clock genes alter gene expression and behavior. Here, we investigated whether disruption of the circadian clock and glucocorticoid signals would influence the gene expression of major urinary protein (Mup) in mice. Both Mup2 mRNA and protein showed biphasic rhythms with similar phase relationships. However, the peak of the rhythm is shifted in mPeriod2 circadian clock mutant mice. We identified two E-boxes and one glucocorticoid response element (GRE) as regulatory elements for Mup2 transcription. While CLOCK binds to the E-boxes constantly, glucocorticoid receptor was capable of binding to the GRE in a timely manner. All together, our results indicate that Mup2 expression is regulated by both the circadian clock and glucocorticoid.
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