Diurnal rhythmicity of the canonical clock genes Per1, Per2 and Bmal1 in the rat adrenal gland is unaltered after hypophysectomy

Journal of Neuroendocrinology
Jan FahrenkrugBirgitte Georg

Abstract

Circadian rhythms are generated by endogenous clocks in the central brain oscillator, the suprachiasmatic nucleus (SCN), and peripheral tissues. The molecular basis for the circadian clock consists of a number of genes and proteins that form transcriptional/translational feedback loops. Rhythmic expression of clock genes in the adrenal glands has previously been reported. Since the central clock in the SCN communicates with the adrenal glands via circadian release of adrenocorticotrophic hormone, we quantified the mRNAs for the canonical clock genes, Per1, Per2 and Bmal1 in the adrenal glands by real-time reverse transcription-polymerase chain reaction during a 24-h-cycle in normal and hypophysectomised rats. The mRNAs for all the three clock genes disclosed rhythmic oscillations with a period of 24 h and the phase did not differ between the hypophysectomised and intact rats. The expression pattern of Per1 and Bmal1 was in antiphase in both groups of animals. In situ hybridisation histochemistry using antisense RNA probes demonstrated that, at times of peak expression, mRNAs for all the three clock genes were expressed in the adrenal cortex with a particularly strong labelling in the zona reticularis. In accordance with the mRN...Continue Reading

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May 25, 2012·Journal of Molecular Neuroscience : MN·Jan FahrenkrugHenrik Løvendahl Jørgensen
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