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Acute and Lifelong Endurance Exercise Yields Differential Effects During Circadian Disruption in Mice.
Med Sci Sports Exerc
January 2025
Department of Zoology and Physiology, Program in Neuroscience, University of Wyoming, Laramie, WY.
Introduction: Circadian rhythms are responsible for physiological and behavioral processes coordinated in a 24-hour cycle. We investigated whether untimed, long-term voluntary wheel access mitigated circadian disruption and facilitated re-entrainment. Methods: Thirty-four C57Bl/6 J mice (n = 21 males, n = 14 females) were used in this experiment.
View Article and Find Full Text PDFComputational modeling of the synergistic role of GCN2 and the HPA axis in regulating the integrated stress response in the central circadian timing system.
Physiol Genomics
August 2024
Department of Chemical and Biochemical Engineering, Rutgers University, Piscataway, New Jersey, United States.
Article Synopsis
- The circadian timing system helps control our daily body rhythms, while the integrated stress response (ISR) helps our cells deal with changes in the body.
- Researchers looked at how the main rhythm controller in the brain (SCN) and the stress response (HPA axis) work together to keep our bodies balanced.
- They created a mathematical model to show how stress affects our body clock and found that a specific protein (GCN2) is important for connecting how we handle stress and our daily rhythms.
Operando investigation of particle re-entrainment mechanism in electrostatic capture process on the lab-on-a-chip.
J Environ Sci (China)
February 2024
Research Center for Combustion and Environmental Technology, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. Electronic address:
Article Synopsis
- Inhalable particles are harmful air pollutants that pose serious health and environmental risks, but their removal is limited due to a phenomenon called particle re-entrainment.
- A new microscopic visualization method has been developed to observe how these particles migrate, deposit, and re-entrain at a micro-level using a lab-on-a-chip system.
- This research captures the process of larger particles breaking off from a particle chain and reveals how drag forces affect this fracturing, providing insights that could lead to improved methods for capturing these harmful particles.
Impact of endogenous melatonin on rhythmic behaviors, reproduction, and survival revealed in melatonin-proficient C57BL/6J congenic mice.
J Pineal Res
September 2021
Laboratory for the Molecular Dynamics of Mental Disorders, Center for Brain Science, RIKEN, Wako-shi, Saitama, Japan.
The hormone melatonin is synthesized from serotonin by two enzymatic reactions (AANAT and ASMT/HIOMT) in the pineal gland following a circadian rhythm with low levels during the day and high levels at night. The robust nightly peak of melatonin secretion is an output signal of the circadian clock to the whole organism. However, so far the regulatory roles of endogenous melatonin in mammalian biological rhythms and physiology processes are poorly understood.
View Article and Find Full Text PDFChocolate for breakfast prevents circadian desynchrony in experimental models of jet-lag and shift-work.
Sci Rep
April 2020
Instituto de Investigaciones Biomédicas, UNAM, Mexico City, Mexico.
Night-workers, transcontinental travelers and individuals that regularly shift their sleep timing, suffer from circadian desynchrony and are at risk to develop metabolic disease, cancer, and mood disorders, among others. Experimental and clinical studies provide evidence that food intake restricted to the normal activity phase is a potent synchronizer for the circadian system and can prevent the detrimental metabolic effects associated with circadian disruption. As an alternative, we hypothesized that a timed piece of chocolate scheduled to the onset of the activity phase may be sufficient stimulus to synchronize circadian rhythms under conditions of shift-work or jet-lag.
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