49 citations
,
April 2016 in “International journal of molecular sciences” This study found that shift nurses exhibited lower circadian variations compared to daytime nurses, indicating an adjustment of their biological clocks to continuous shift schedules.
28 citations
,
June 2015 in “Journal of circadian rhythms” This study found that extreme morning and evening chronotypes exhibited significant differences in the timing of circadian clock gene expression in hair follicle cells.
166 citations
,
August 2010 in “Proceedings of the National Academy of Sciences of the United States of America” This study reports a less invasive method for detecting human clock gene expression using hair follicle cells, which accurately reflects individual behavioral rhythms and suggests a time lag issue for rotating shift workers.
92 citations
,
September 2013 in “Journal of Investigative Dermatology” This study found that peripheral clock genes, particularly BMAL1 and Period1, modulate human hair follicle cycling, suggesting their potential as therapeutic targets for affecting hair growth.
30 citations
,
March 2015 in “PLoS ONE” This study found that thyroxine modulates peripheral molecular clock gene expression in human hair follicles, which may have implications for treating clock-related diseases in patients with thyroid dysfunction.
14 citations
,
June 2016 in “Hypertension research” The authors concluded that utilizing clock gene expression from hair follicle cells may improve circadian-phase estimation in clinical settings, aiding the detection of circadian-related sleep problems despite social time constraints.
103 citations
,
December 2021 in “Journal of biological rhythms” This review discusses recent evidence on how night-shift work affects the circadian system, sleep, and alertness in shift workers, and reports no clinical results; potential impacts on health are considered.
12 citations
,
July 2017 in “Scientific reports” In this study, researchers developed a simple, non-invasive method to monitor circadian gene expression using whole hair root cultures, finding that elderly dementia patients' peripheral clocks still oscillate similarly to younger, healthier individuals, which suggests cellular senescence minimally affects some aspects of circadian rhythms.
18 citations
,
March 2015 in “Journal of Investigative Dermatology” In this study, silencing BMAL1 and PER1 genes increased melanogenic activity in follicular and epidermal melanocytes, suggesting that peripheral circadian clocks may regulate melanin pigmentation.
36 citations
,
July 2016 in “Scientific reports” This study found that decision-making effects related to time of day and chronotype were only significant when using RNA-based chronotype measurements, indicating molecular clock differences may influence these behaviors.
38 citations
,
August 2012 in “Biochemical and biophysical research communications” This study found that leukocytes and beard hair follicle cells have an endogenous circadian clock, with PER1 and PER3 expression possibly serving as biomarkers for assessing individual biological clock traits.
15 citations
,
October 2012 in “Journal of circadian rhythms” This study found that extracting RNA from equine hair follicles can effectively identify 24-hour oscillations of specific circadian clock genes, offering a valuable non-invasive method to evaluate the equine circadian clock.
5 citations
,
January 2023 in “International Journal of Molecular Sciences” This review discusses the expression of circadian genes in hair follicles and their potential for monitoring circadian-rhythm-related conditions, reporting no clinical results; the authors suggest combining hair sampling with other assessments for better insight.
July 2023 in “Biomolecules” In this review, the authors discussed how the circadian clock influences hair follicle regeneration by regulating metabolism, suggesting potential new targets for hair loss treatments.
127 citations
,
January 2015 in “Journal of Biological Rhythms” This review discusses the role of the circadian clock in skin functions such as cell proliferation and UV protection and reports no new results; the authors note its potential in studying immune regulation and seasonal behaviors.
116 citations
,
May 2013 in “Proceedings of the National Academy of Sciences of the United States of America” This study discovered that the circadian clock influences hair follicle regeneration, making hair grow faster in the morning and causing more radiation-induced hair loss in the morning compared to the evening.
293 citations
,
November 2011 in “Nature” This study found that the circadian clock regulates the activation state of murine epidermal stem cells, affecting tissue homeostasis and susceptibility to tumorigenesis when disrupted.
81 citations
,
October 2014 in “The journal of investigative dermatology/Journal of investigative dermatology” This study found that silencing clock genes BMAL1 or PER1 in human hair follicles increased melanin content and melanocyte activity, suggesting these genes influence pigmentation.
91 citations
,
August 2014 in “Development” This review discusses how circadian clocks may influence diverse physiological functions beyond their established role in daily timekeeping, but it reports no new experimental findings.
84 citations
,
December 2017 in “EMBO Reports” This review discusses the role of circadian rhythms in stem cell differentiation and tissue regeneration, emphasizing their impact on organ physiology and aging, but reports no new experimental results.
75 citations
,
September 2017 in “Developmental biology” This review discusses circadian clock regulation in stem cells and its role in processes like neurogenesis, but reports no new results; the authors emphasize its significance in stem cell function across various tissues.
5 citations
,
December 2016 in “International journal of biometeorology” In this study, bright light exposure during the daytime did not significantly affect clock gene expression in humans, although Rev-erb-ß expression appeared stronger under bright light compared to dim light.
21 citations
,
September 2013 in “Journal of circadian rhythms” In this study, heavy nighttime physical exercise delayed the circadian phase of clock gene expression by 2 to 4 hours in a professional fighter, suggesting potential implications for managing circadian disorders.
237 citations
,
February 2016 in “Science Translational Medicine” This study found that many effects previously thought to be caused by circadian rhythm disruption in Bmal1 knockout mice are actually due to BMAL1's properties unrelated to its clock function.
12 citations
,
January 2019 in “Sleep medicine” This study found that night shift work disrupts clock gene expression in Japanese men, particularly affecting rhythms and levels of Period3 and Nr1d2, based on the shift schedule.
6 citations
,
December 2011 in “Nature” This study found that the circadian clock regulates the activation and heterogeneity of hair follicle bulge stem cells, affecting tissue homeostasis and tumorigenesis risk in mouse skin.
62 citations
,
August 2014 in “BMC Endocrine Disorders” This review summarizes the recent advances in molecular mechanisms influencing tissue sensitivity to glucocorticoids, emphasizing novel mutations and new information on the glucocorticoid receptor's circadian rhythm and ligand-induced repression, but reports no new results.
221 citations
,
July 2012 in “Proceedings of the National Academy of Sciences of the United States of America” This study found that the circadian clock in mouse skin regulates cell proliferation and affects sensitivity to UVB-induced DNA damage, with potential implications for understanding human skin cancer risk.
6 citations
,
March 2022 in “International journal of molecular sciences” This review explores the detrimental effects of sunlight on the skin’s circadian rhythm and photodamage, noting the potential of natural cosmeceuticals to influence this rhythm, but reports no new results.
66 citations
,
July 2015 in “Journal of Molecular Biology” This review discusses how macro-environmental factors such as intradermal adipose tissue and sex hormones influence hair and feather stem cell niches, suggesting environmental targets for regenerative medicine, but reports no new clinical results.