4.7 Article

Single cell model for re-entrainment to a shifted light cycle

期刊

FASEB JOURNAL
卷 36, 期 10, 页码 -

出版社

WILEY
DOI: 10.1096/fj.202200478R

关键词

entrainment; PER2; phase shift; retinohypothalamic tract; suprachiasmatic nucleus

资金

  1. EC | European Research Council (ERC) [834513]
  2. European Research Council (ERC) [834513] Funding Source: European Research Council (ERC)

向作者/读者索取更多资源

Our study investigated the effect of a 6-hour delay in the light-dark cycle on PERIOD2::LUCIFERASE expression at the single-cell level in mouse SCN organotypic explants. We found a bimodal distribution of phase shift response in the anterior and central SCN, with ventrolateral SCN neurons showing rapid phase shifts while dorsal SCN neurons did not respond. Additionally, there were similarities between the distribution of neurons with rapid shifting response and neurons excited by electrical stimulation. This suggests that light-excited neurons in the anterior and central SCN play a crucial role in adapting to changes in the external light-dark cycle.
Our daily 24-h rhythm is synchronized to the external light-dark cycle resulting from the Earth's daily rotation. In the mammalian brain, the suprachiasmatic nucleus (SCN) serves as the master clock and receives light-mediated input via the retinohypothalamic tract. Abrupt changes in the timing of the light-dark cycle (e.g., due to jet lag) cause a phase shift in the circadian rhythms in the SCN. Here, we investigated the effects of a 6-h delay in the light-dark cycle on PERIOD2::LUCIFERASE expression at the single-cell level in mouse SCN organotypic explants. The ensemble pattern in phase shift response obtained from individual neurons in the anterior and central SCN revealed a bimodal distribution; specifically, neurons in the ventrolateral SCN responded with a rapid phase shift, while neurons in the dorsal SCN generally did not respond to the shift in the light-dark cycle. We also stimulated the hypothalamic tract in acute SCN slices to simulate light-mediated input to the SCN; interestingly, we found similarities between the distribution and fraction of rapid shifting neurons (in response to the delay) and neurons that were excited in response to electrical stimulation. These results suggest that a subpopulation of neurons in the ventral SCN that have an excitatory response to light input, shift their clock more readily than dorsal located neurons, and initiate the SCN's entrainment to the new light-dark cycle. Thus, we propose that light-excited neurons in the anterior and central SCN play an important role in the organism's ability to adjust to changes in the external light-dark cycle.

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