Abstract
The insect moulting hormones, viz. the ecdysteroids, regulate gene expression during development by binding to an intracellular protein, the ecdysteroid receptor (EcR). In the insect Rhodnius prolixus, circulating levels of ecdysteroids exhibit a robust circadian rhythm. This paper demonstrates associated circadian rhythms in the abundance and distribution of EcR in several major target tissues of ecdysteroids, but not in others. Quantitative analysis of immunofluorescence images obtained by confocal laser-scanning microscopy following the use of anti-EcR has revealed a marked daily rhythm in the nuclear abundance of EcR in cells of the abdominal epidermis, brain, fat body, oenocytes and rectal epithelium of Rhodnius. This EcR rhythm is synchronous with the rhythm of circulating hormone levels. It free-runs in continuous darkness for several cycles, showing that EcR nuclear abundance is under circadian control. Circadian control of a nuclear receptor has not been shown previously in any animal. We infer that the above cell types detect and respond to the temporal signals in the rhythmic ecdysteroid titre. In several cell types, the rhythm in cytoplasmic EcR peaks several hours prior to the EcR peak in the nucleus each day, thereby implying a daily migration of EcR from the cytoplasm to the nucleus. This finding shows that EcR is not a constitutive nuclear receptor, as has previously been assumed. In the brain, rhythmic nuclear EcR has been found in peptidergic neurosecretory cells, indicating a potential pathway for feedback regulation of the neuroendocrine system by ecdysteroids, and also in regions containing circadian clock neurons, suggesting that the circadian timing system in the brain is also sensitive to rhythmic ecdysteroid signals.
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Acknowledgements
We are grateful to Dr. Markus Lezzi for critical advice, helpful discussions and encouragement during this work, Dr. Arthur Forer for critical advice regarding the analysis of confocal immunofluorescence images and Dr. Peter Moens for continuous support and advice throughout these studies.
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This work was supported by a Discovery Grant from the Natural Sciences and Engineering Research Council of Canada.
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Vafopoulou, X., Steel, C.G.H. hormone nuclear receptor (EcR) exhibits circadian cycling in certain tissues, but not others, during development in Rhodnius prolixus (Hemiptera). Cell Tissue Res 323, 443–455 (2006). https://doi.org/10.1007/s00441-005-0076-1
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DOI: https://doi.org/10.1007/s00441-005-0076-1