Results 61 to 70 of about 33,968 (213)

An eye on long‐duration spaceflight: Controversies, countermeasures and challenges

Experimental Physiology, EarlyView.
Abstract Space flight‐associated neuroocular syndrome (SANS) is a consequence of long‐duration space flight and is detected in two‐thirds of astronauts. In‐flight, this can cause a change in the refraction of the eyes, requiring graded hypermetropic ‘superfocus adjustable’ glasses, optic nerve head oedema and choroidal folds.
Vincent Wing Sum Ng, Susan Patricia Mollan   +1 more
wiley   +1 more source

Imaging Individual Differences in the Response of the Human Suprachiasmatic Area to Light

Frontiers in Neurology, 2018
Circadian disruption is associated with poor health outcomes, including sleep and mood disorders. The suprachiasmatic nucleus (SCN) of the anterior hypothalamus acts as the master biological clock in mammals, regulating circadian rhythms throughout the ...
Elise M. McGlashan, Govinda R. Poudel, Govinda R. Poudel, Govinda R. Poudel, Parisa Vidafar, Sean P. A. Drummond, Sean W. Cain   +6 more
doaj   +1 more source

The VIP-VPAC2 neuropeptidergic axis is a cellular pacemaking hub of the suprachiasmatic nucleus circadian circuit

Nature Communications, 2020
Circadian activity modulation in the suprachiasmatic nucleus (SCN) is a network-level emergent property that requires neuropeptide VIP signaling, yet the precise cellular mechanisms are unknown. Patton et al.
Andrew P. Patton, Mathew D. Edwards, Nicola J. Smyllie, Ryan Hamnett, Johanna E. Chesham, Marco Brancaccio, Elizabeth S. Maywood, Michael H. Hastings   +7 more
doaj   +1 more source

Identification of Melatonin-Regulated Genes in the Ovine Pituitary Pars Tuberalis, a Target Site for Seasonal Hormone Control [PDF]

, 2008
The pars tuberalis (PT) of the pituitary gland expresses a high density of melatonin (MEL) receptors and is believed to regulate seasonal physiology by decoding changes in nocturnal melatonin secretion.
Alison Downing, Ando, Andrew S. I. Loudon, Ashburner, Bae, Barrett, Bartness, Bechtold, Benoit Malpaux, Bockers, Bockers, Bockmann, Brahimi-Horn, Camon, Carr, Chemineau, Chen, Curlewis, Daphne Mouzaki, Dardente, Dave W. Burt, David Waddington, Draghici, Dupre, Fukuhara, Gerald A. Lincoln, Ghorbel, Graham, Grossmann, Hanon, Hazlerigg, Hazlerigg, Hazlerigg, Hogenesch, Hu, Hu, Johnston, Johnston, Johnston, Julian R. E. Davis, Kel, Kijas, Klosen, Ko, Lamolet, Lee, Lincoln, Lincoln, Lincoln, Lincoln, Malpaux, Merks, Messager, Michan, Morgan, Morgan, Mutoh, Nakao, Naya, Naya, Nilaweera, Oki, Poulin, Reick, Revollo, Richard Talbot, Roepke, Rutter, Samal, Sandrine M. Dupré, Schroeder, Segawa, Stehle, Stirland, Storey, Su, Tobler, Tournier, Wagner, Westfall, Williams, Wittkowski, Yang, Yokoyama   +83 more
core   +2 more sources

In vitro muscle contraction: A technical review on electrical pulse stimulation in C2C12 cells

Experimental Physiology, EarlyView.
Abstract Electrical pulse stimulation (EPS) of skeletal muscle cells is increasingly used to model exercise In vitro. The murine C2C12 myotube system has become a common platform for such studies, yet wide variability in EPS protocols hampers reproducibility and cross‐study comparisons.
Mark R. C. van de Meene, Anita M. van den Hoek, Roeland Hanemaaijer, Lars Verschuren, Jelle C. B. C. de Jong   +4 more
wiley   +1 more source

Retino-hypothalamic regulation of light-induced murine sleep

Frontiers in Systems Neuroscience, 2014
The temporal organization of sleep is regulated by an interaction between the circadian clock and homeostatic processes. Light indirectly modulates sleep through its ability to phase shift and entrain the circadian clock.
Fanuel eMuindi, Fanuel eMuindi, Jamie M. Zeitzer, Jamie M. Zeitzer, H Craig eHeller   +4 more
doaj   +1 more source

NAD+‒circadian rhythm coupling in dementia

Alzheimer's &Dementia, Volume 22, Issue 5, May 2026.
Abstract The circadian rhythm system and sleep coordinate whole‐body functions across the 24‐h cycle, yet these rhythms progressively deteriorate with neurodegenerative diseases, including dementia. Growing evidence indicates that nicotinamide adenine dinucleotide (NAD+) interacts with the circadian system through multiple molecular pathways and that ...
Shi‐qi Zhang, Jiyeon Lee, Jun‐ping Pan, Rune Enger, Harald Hrubos‐Strøm, Erik S. Musiek, Evandro Fei Fang, Weidong Le   +7 more
wiley   +1 more source

Circadian variation in gastric vagal afferent mechanosensitivity [PDF]

, 2013
Food intake is coordinated to cellular metabolism by clock gene expression with a master clock in the suprachiasmatic nucleus synchronized by light exposure.
Frisby, C.L., Kennaway, D., Kentish, S., Page, A., Wittert, G.   +4 more
core   +2 more sources

Characterizing circadian rest–activity rhythm patterns across Alzheimer's disease continuum in Down syndrome

Alzheimer's &Dementia, Volume 22, Issue 5, May 2026.
Abstract INTRODUCTION Sleep and circadian rest–activity rhythm (RAR) disruption may bidirectionally relate to Alzheimer's disease (AD). Down syndrome (DS), the most common genetic cause of AD, presents sleep disorders, yet RAR patterns across the DS‐associated AD continuum remain uncharacterized. METHODS We analyzed 7‐day wrist actigraphy in 140 adults
Sandra Giménez, Lídia Vaqué‐Alcázar, Susana Clos, Bessy Benejam, Maria Carmona‐Iragui, Lucía Maure‐Blesa, Laura Videla, Nuole Zhu, Miren Altuna, Javier Arranz, Isabel Barroeta, Íñigo Rodríguez‐Baz, Alexandre Bejanin, Ana Bueno, Susana Fernandez, Laura del Hoyo Soriano, Lucia Pertierra, Daniel Alcolea, Bruce Miller, Lea T. Grinberg, Joaquin Ruiz, Christos Panagiotis Lisgaras, Hau‐Tieng Wu, Alberto Lleó, Ricardo S. Osorio, Esther M. Blessing, Juan Fortea   +26 more
wiley   +1 more source

It takes two to tango: NAD+ and sirtuins in aging/longevity control [PDF]

, 2016
The coupling of nicotinamide adenine dinucleotide (NAD+) breakdown and protein deacylation is a unique feature of the family of proteins called ‘sirtuins.’ This intimate connection between NAD+ and sirtuins has an ancient origin and provides a ...
Guarente, Leonard, Imai, Shin-ichiro
core   +2 more sources