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Long-term artificial/natural daytime light affects mood, melatonin, corticosterone, and gut microbiota in rats

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Abstract

The desynchronization of circadian rhythms affected by light may induce physiological and psychological disequilibrium. We aimed to elucidate changes of growth, depression-anxiety like behaviors, melatonin and corticosterone (CORT) secretion, and gut microbiota in rats influenced by long-term light inputs. Thirty male Sprague–Dawley rats were exposed to a 16/8 h light/dark regime for 8 weeks. The light period was set to 13 h of daylight with artificial light (AL group, n = 10), or with natural light (NL group, n = 10), or with mixed artificial-natural light (ANL group, n = 10), and 3 h of artificial night light after sunset. The obtained findings indicated that the highest weight gain and food efficiency were observed in the AL group and the lowest in NL group. In the behavioral tests, the NL and ANL groups showed lower anxiety level than AL group, and ANL groups showed lower depression level than AL group. The NL and ANL groups had delayed acrophases and maintained higher concentrations of melatonin compared to AL group. The circadian rhythm of CORT was only found in ANL group. At the phylum level, the mixed light contributed to a lower abundance of Bacteroidetes. The genus level results recommend a synergistic effect of artificial light and natural light on Lactobacillus abundance and an antagonistic effect on the Lachnospiraceae_NK4A136_group abundance. The study indicated that the mixture of artificial and natural light as well as the alignment of the proportions had beneficial influences on depression-anxiety-like levels, melatonin and corticosterone secretion, and the composition of the gut microbiota.

Key points

• The mixed light can reduce the depression-anxiety level

• The mixed light can maintain the secretion rhythm of melatonin and CORT

• The mixed light can increase Lactobacillus and decrease Lachnospiraceae_NK4A136_group

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Data availability

The data that support the findings of this study are in this published article and available from the corresponding author upon reasonable request.

Code availability

The code applied in the data analysis is available from the corresponding author upon reasonable request.

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Acknowledgements

We are thankful to the China Scholarship Council (CSC) for supporting the doctoral student WW (CSC 201806020189).

Funding

This work was financially supported by the grant from the Beijing Natural Science Foundation (7222112) and National Natural Science Foundation of China (82101626).

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Authors

Contributions

HL supervised this study. HL and WW conceived and designed this research. WW and ZH conducted the animal experiments and prepared the figures. WW and ZH analyzed data. WW and HL wrote the manuscript. ZW and JC conducted the light measurement and prepared the figures. ZH contributed funding acquisition. All authors have read, revised, and approved the manuscript.

Corresponding authors

Correspondence to Zikai Hao or Hong Liu.

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Ethics approval

This experiment followed the National Institutes of Health Guide for the Care and Use of Laboratory Animals, and the protocols were approved by the Biological and Medical Ethics Committee of Beihang University.

Conflict of interest

The authors declare no competing interests.

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Wang, W., Hao, Z., Wu, Z. et al. Long-term artificial/natural daytime light affects mood, melatonin, corticosterone, and gut microbiota in rats. Appl Microbiol Biotechnol 107, 2689–2705 (2023). https://doi.org/10.1007/s00253-023-12446-y

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  • DOI: https://doi.org/10.1007/s00253-023-12446-y

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