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Circadian Influences on Brain Lipid Metabolism and Neurodegenerative Diseases.
Metabolites
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Department of Foundations of Medicine, New York University Grossman Long Island School of Medicine, Mineola, NY 11501, USA.
Circadian rhythms are intrinsic, 24 h cycles that regulate key physiological, mental, and behavioral processes, including sleep-wake cycles, hormone secretion, and metabolism. These rhythms are controlled by the brain's suprachiasmatic nucleus, which synchronizes with environmental signals, such as light and temperature, and consequently maintains alignment with the day-night cycle. Molecular feedback loops, driven by core circadian "clock genes", such as Clock, Bmal1, Per, and Cry, are essential for rhythmic gene expression; disruptions in these feedback loops are associated with various health issues.
View Article and Find Full Text PDFLight responses during early day phases of CIRCADIAN CLOCK ASSOCIATED 1 (CCA1) and PSEUDO-RESPONSE REGULATOR (PRR) homologous genes in the moss Physcomitrium patens.
Photochem Photobiol
December 2024
Graduate School of Informatics, Nagoya University, Nagoya, Japan.
Circadian clocks facilitate organisms' adaptation to the day-night environmental cycle. Some of the component genes of the clocks ("clock genes") respond directly to changes in ambient light, supposedly allowing the clocks to synchronize to and/or oscillate robustly in the environmental cycle. In the dicotyledonous model plant Arabidopsis thaliana, the clock genes CIRCADIAN CLOCK ASSOCIATED 1 (CCA1), LATE ELONGATED HYPOCOTYL (LHY) and PSEUDO-RESPONSE REGULATOR 9 (PRR9) show transient expression in response to the morning light.
View Article and Find Full Text PDFLight at night and circadian rhythms: from the perspective of physiological anthropology research.
J Physiol Anthropol
December 2024
Department of Human Life Design and Science, Faculty of Design, Kyushu University, 4-9-1 Shiobaru, Minami-Ku, Fukuoka City, Fukuoka, Japan.
Incorporating Physical Activity in a New Two-Oscillator Model of Circadian Activity in Nocturnal and Diurnal Mammals.
J Biol Rhythms
December 2024
Department of Cell and Chemical Biology, Leiden University Medical Center, Leiden, The Netherlands.
In both diurnal and nocturnal species, the neurons in the suprachiasmatic nucleus (SCN) generate a daily pattern in which the impulse frequency peaks at midday and is lowest during the night. This pattern, common to both day-active and night-active species, has led to the long-standing notion that their functional difference relies merely on a sign reversal in SCN output. However, recent evidence shows that the response of the SCN to the animal's physical activity is opposite in nocturnal and diurnal animals.
View Article and Find Full Text PDFArtificial light at night and risk of depression: a systematic review and meta-analysis.
Environ Health Prev Med
December 2024
School of Population Medicine and Public Health, Chinese Academy of Medical Sciences and Peking Union Medical College.
Background: Artificial light at night (ALAN) has been increasingly recognized as a potential environmental risk factor for mental health issues. However, no meta-analyses have been conducted to summarize the findings. This study aimed to evaluate the pooled associations between outdoor and indoor ALAN exposures and the risk of depression.
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