Brain Structure and Function

, Volume 220, Issue 3, pp 1251–1262 | Cite as

Gender associated circadian oscillations of the clock genes in rat choroid plexus

  • T. QuintelaEmail author
  • C. Sousa
  • F. M. Patriarca
  • I. Gonçalves
  • C. R. A. Santos
Original Article


It is well-documented that circadian rhythms are controlled by the circadian master clock of the mammalian brain, located in the suprachiasmatic nucleus (SCN) of the hypothalamus. The SCN clockwork is a cell autonomous mechanism consisting of a series of interlocked transcriptional/post-translational feedback loops. In turn, the SCN controls the seasonal rhythmicity of various biological processes, in particular the secretion pattern of hormones. Although the effects of gonadal hormones on circadian rhythmicity are clearly established, how the SCN integrates and regulates these hormonal stimuli remains unknown. We have previously found that clock genes are expressed in the choroid plexus (CP). Therefore, we compared the circadian expression of these genes in female and male rat CP. We show that there is a 24-h rhythm in the expression of Per2 and Cry2 in males and females. Bmal1 and Per1 expression also varied along the day, but only in females. Bmal1, Clock and Per1 mRNA did not show any significant differences in the CP of males. Moreover, data from cultured CP cells collected at different timepoints revealed significant circadian rhythms in mRNA abundance of Bmal1, Clock and Per2. In conclusion, our data show that the rat CP expresses all canonical clock genes and that their circadian expression differs between genders suggesting that hormones can regulate circadian rhythmicity in CP.


Choroid plexus Circadian rhythm Sex hormones Clock genes Suprachiasmatic nucleus 



This work was supported by Fundação para a Ciência e Tecnologia (FCT, Portugal— project grants (PTDC/SAU-NEU/114800/2009) and COMPETE (PEst-C/SAU/UI0709/2011). Telma Quintela is a recipient of a FCT fellowship (SFRH/BPD/70781/2010).

Supplementary material

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Supplementary material 1 (DOCX 783 kb)
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Supplementary material 2 (DOCX 482 kb)
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Supplementary material 3 (DOCX 14 kb)


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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • T. Quintela
    • 1
    Email author
  • C. Sousa
    • 1
  • F. M. Patriarca
    • 1
  • I. Gonçalves
    • 1
  • C. R. A. Santos
    • 1
  1. 1.CICS-UBI-Health Sciences Research CentreUniversity of Beira InteriorCovilhãPortugal

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