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Circadian expression of Bmal1 and serotonin-N-acetyltransferase mRNAs in chicken retina cells and pinealocytes in vivo and in vitro

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Abstract

Unlike mammals, rhythmic changes in serotonin N-acetyltransferase (arylalkylamine N-acetyltransferase [AANAT]) transcripts in chicken pineal cells are controlled by an oscillator located in the pinealocytes themselves, which is comprised of clock genes. A similar clock-dependent pathway has been postulated to regulate the retinal melatonin rhythm. In chicken retinal photoreceptor cells and pinealocytes, the chicken AANAT gene (cAANAT) is coexpressed with clock genes, including cBmal1 and cClock, which might regulate cAANAT transcription. Here, we have studied the temporal profile of cBmal1, cClock, and cAANAT mRNA expression in retinal cells in vivo with chickens housed in a 14/10-h light/dark (LD) cycle for 2 wk and in vitro cultured in a superfusion system for 4 LD cycles. mRNA levels of these genes were analyzed by RT-PCR and compared with their corresponding pineal transcripts. cBmal1 mRNA showed a peak during the light phase between Zeitgeber time (ZT) 8 and 10, preceding the amplitude of the nocturnal increase in cAANAT expression at ZT 16–17. Retinal cBmal1 and cAANAT mRNAs exhibited less robust cycling than their corresponding pineal transcripts in the same animal. cClock mRNA levels failed to exhibit a well-detectable rhythm. The phase of the rhythms of retinal cBmal1 and cAANAT mRNAs suggests a link between retinal cBmal1 and cAANAT expressions similar to the regulation of pineal cAANAT transcription. Based on the highly conserved nature of the clockwork, it is reasonable to consider that chicken retina and pineal gland might serve as a useful tool for the development of drugs that could infuence clock function in man.

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Authors and Affiliations

  1. Department of Anatomy, University of Pecs, 7624, Pecs, Hungary

    Gabor L. Toller, Eniko Nagy, Reka A. Horvath, Barbara Klausz & Zoltan Rekasi

  2. Neurohumoral Regulations Research Group of the Hungarian Academy of Sciences, 7624, Pecs, Hungary

    Gabor L. Toller, Eniko Nagy, Reka A. Horvath, Barbara Klausz & Zoltan Rekasi

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  1. Gabor L. Toller
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  2. Eniko Nagy
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  5. Zoltan Rekasi
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Correspondence to Zoltan Rekasi.

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Toller, G.L., Nagy, E., Horvath, R.A. et al. Circadian expression of Bmal1 and serotonin-N-acetyltransferase mRNAs in chicken retina cells and pinealocytes in vivo and in vitro. J Mol Neurosci 28, 143–150 (2006). https://doi.org/10.1385/JMN:28:2:143

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  • DOI: https://doi.org/10.1385/JMN:28:2:143

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