background preloader

Chronobiologie

Facebook Twitter

Resetting Our Clocks: New Details About How the Body Tells Time - Inside Life Science Series - National Institute of General Medical Sciences. View All Articles | Inside Life Science Home Page By Emily Carlson Posted March 6, 2014 Boosting doses of a molecule called VIP (green) in time-keeping brain cells (blue) helped mice adjust quickly to major shifts in light-dark cycles.

Resetting Our Clocks: New Details About How the Body Tells Time - Inside Life Science Series - National Institute of General Medical Sciences

Credit: Cristina Mazuski in the lab of Erik Herzog, Washington University in St. Louis. Springing clocks forward by an hour this Sunday, traveling across time zones, staring at a computer screen late at night or working the third shift are just a few examples of activities that can disrupt our daily, or circadian, rhythms. Researchers funded by the National Institutes of Health have spent decades piecing together the molecular mechanisms of our biological clocks. "The implications are quite significant when you think about the potential health and economic impact," says NIH's Michael Sesma, who has tracked progress in circadian rhythms research for more than 15 years.

In one recent study, a team of scientists from Washington University in St. Differential Expression of Circadian Genes in Leukemia and a Possible Role for Sirt1 in Restoring the Circadian Clock in Chronic Myeloid Leukemia. Introduction Important mammalian physiological processes such as sleep-wake patterns, gene transcription and regulation of metabolism to name a few; undergo periodic changes or circadian rhythms which typically span a 24h cycle [1, 2, 3].

Differential Expression of Circadian Genes in Leukemia and a Possible Role for Sirt1 in Restoring the Circadian Clock in Chronic Myeloid Leukemia

Two components underpin the circadian system in mammals: A central pacemaker resident within the suprachiasmatic nucleus (SCN) found in the anterior hypothalamus together with core circadian genes that collectively make up the circadian oscillator and secondly peripheral oscillators located in different tissues around the body [3, 4]. Les noyaux suprachiasmatiques : une horloge circa… – M/S : médecine sciences – Érudit. Maintaining Body's Circadian Clock May be Due to Synchronized Voltage Rhythms. Circadian Lighting Improves Patient Outcomes in the ICU. Vitamin D pills 'could stop colds or flu' Image copyright Thinkstock Vitamin D supplements could spare more than three million people from colds or flu in the UK each year, researchers claim.

Vitamin D pills 'could stop colds or flu'

The sunshine vitamin is vital for healthy bones, but also has a role in the immune system. The analysis, published in the British Medical Journal, argues food should be fortified with the vitamin. But Public Health England (PHE) says the infections data is not conclusive, although it does recommend supplements. These, it says, should be taken for improved bone and muscle health. The immune system uses vitamin D to make antimicrobial weapons that puncture holes in bacteria and viruses. Weekend camping resets body clock. Image copyright University of Colorado Boulder Spending a weekend out camping resets the clock inside our bodies that influences sleeping habits, scientists at a US university have discovered.

Weekend camping resets body clock

The team argue that time in the great outdoors could help those struggling to get up in the morning and boost health. The researchers said swapping bricks and mortar for canvas was not a long-term solution. But exposing ourselves to more bright light in the day (and less at night) could help. System-Driven and Oscillator-Dependent Circadian Transcription in Mice with a Conditionally Active Liver Clock. Le rythme des divisions cellulaires est couplé à celui de l’horloge biologique interne.

15 juillet 2014.

Le rythme des divisions cellulaires est couplé à celui de l’horloge biologique interne

L’horloge biologique cérébrale stimule les signaux de soif avant la période de sommeil : Le Bulletel. Mouse SCN Neurons in a Cultured Slice. An Error Occurred Setting Your User Cookie. Mouse SCN Neurons in Dispersed Culture. How the Body Works : The Biological Clock. The Secret Life of Your Bodyclock (BBC Horizon, 2009) (chemotherapy) Postnatal light alters hypothalamic-pituitary-adrenal (HPA) axis function and induces a depressive-like phenotype in adult mice - Coleman - 2016 - European Journal of Neuroscience.

The postnatal light environment that a mouse experiences during the critical first 3 postnatal weeks has long-term effects on both its circadian rhythm output and clock gene expression.

Postnatal light alters hypothalamic-pituitary-adrenal (HPA) axis function and induces a depressive-like phenotype in adult mice - Coleman - 2016 - European Journal of Neuroscience

Furthermore, data from our lab suggest that postnatal light may also impact the hypothalamic-pituitary-adrenal (HPA) axis, which is a key regulator of stress. Impact du travail de nuit sur le système immunitaire. Etre en bonne santé est un besoin universel.

Impact du travail de nuit sur le système immunitaire

Claire Hédon reçoit en direct des spécialistes pour faire le point sur l’actualité médicale dans le monde. Le but : faire de la prévention auprès du grand public, l’informer sur ses droits, sur les traitements et les moyens d’y accéder. Tous les jours, posez vos questions par mail à priorite.sante@rfi.fr ou par téléphone au 00 33 1 84 22 75 75. GetSharedSiteSession?rc=4&redirect= We employed the paradigm in a photoperiodic species in which the innate nature of the circannual timing mechanism is revealed by exposure to constant long day length over prolonged periods.

getSharedSiteSession?rc=4&redirect=

Using this model, we addressed what role the photoperiodic relay mechanism might play in the initiation of a circannual rhythm. Two broad possible outcomes can be considered. First, the photoperiodic relay might faithfully record the environmental light cycle but does not contribute to circannual rhythm generation. Second, the input relay may itself also be part of the circannual timing mechanism, in which case it would be predicted to change spontaneously over the circannual cycle and map closely to the underlying physiology. How A Single Hormone Plays Two Roles. The trick to performing the two different functions of season sensing or metabolic regulation is glycosylation, researchers say.

How A Single Hormone Plays Two Roles

Asian Scientist Newsroom | November 6, 2014 | In the Lab AsianScientist (Nov. 6, 2014) - Scientists at the Institute for Transformative Bio-Molecules (ITbM) of Nagoya University and the University of Chicago have discovered the mechanism of how a single hormone manages to trigger two different functions—seasonal sensing and metabolism—without any cross activity. Tweaking Circadian Rhythms With Small Molecule Drugs. Synthetic chemistry has enabled researchers to develop small molecule drugs which target regulators of the circadian cycle.

Tweaking Circadian Rhythms With Small Molecule Drugs

Asian Scientist Newsroom | June 19, 2015 | In the Lab AsianScientist (Jun. 18, 2015) - A team of chemists and biologists at the Institute of Transformative Bio-Molecules (ITbM), Nagoya University have succeeded in finding new molecules that change the circadian rhythm in mammals by applying synthetic chemistry methods, which makes use of highly selective metal catalysts. Most living organisms have a biological clock with an approximately 24-hour circadian rhythm, which regulates important body functions such as sleep/wake cycles, hormone secretion and metabolism.

Disruption of the circadian rhythm by genetic mutations and environmental factors, such as jet lag, may lead to sleep disorders, as well as lifestyle diseases such as obesity, cancer and mental disorders. Circadian clock research has accelerated rapidly since the discovery of clock genes in the 1990’s. Mr.

Une ville allemande s'adapte au rythme biologique de ses habitants. Chronobiologie : les bons rythmes pour être en forme. Chronobiologie. Dur pour un ado de sortir du lit le matin ! La faute à la puberté, qui transforme les jeunes en oiseaux de nuit, explique le professeur Till Roenneberg, spécialiste mondial de la chronobiologie, l’étude des rythmes biologiques. Vivons-nous vraiment selon notre biorythme. La chronobiologie nutrition rythme biologique faim appetit.

Interviews - Jean-Robert Rapin : « on ne traite pas la fatigue mais un patient fatigué » LaNutrition.fr : Quels conseils donner aux médecins qui reçoivent des patients « fatigués » ? Le cerveau à tous les niveaux. Remettre à l’heure nos horloges biologiques. Le rythme dans la peau.

Why sleep could be the key to tackling mental illness. We are only beginning to unravel the genetic and biochemical basis of mental illness – a vague term including conditions as diverse as anxiety, depression, and mood and psychotic disorders. With millions of people suffering from such conditions, it is crucial that we find ways to improve diagnosis and treatment. But an increasing body of scientific evidence is now suggesting that we should turn our attention to one of our most basic functions: sleep. Studies suggest that disrupted sleep such as insomnia could actually help us predict episodes of mental illness and that fixing sleep problems may help treat them.

Despite this, the effects of sleep on mental illness have been largely ignored in the clinic so far. But how is sleep and mental health actually linked in the brain? All That Coffee You're Guzzling Is Useless if You're Not Getting Enough Sleep, Study Says. In a few months, Apple is expected to show off its shiny new iPhones, holding them up like Simba as Silicon Valley's eyes glisten in the rectangular metal's shadow.

And it'll probably look a lot like the iPhone 6s. iPhone 7 rumors indicate that the next-gen Apple phone will be "almost identical" to the iPhone 6s in terms of size and thickness, MacRumors reported. It'll also likely launch alongside an iPhone 7 Plus, just like its predecessor, measuring in at 4.7 and 5.5-inch screen sizes, respectively. The iPhone 7 and iPhone 7 Plus may be a bit sleeker than the iPhone 6s though — rumors suggest that the antenna bands (those stripes across the back of the phone) will be removed and it'll feature a less protrusive camera. Thinner It may also be thinner if it scraps the headphone jack, which Forbes reported may be the case, since there's a leaked iPhone 7 case that doesn't have a dedicated cutout for it.

What Sleep Deprivation Does to Your Brain, in One Stunning Infographic. Christina Grimmie, a former contestant on the singing competition The Voice, was shot and killed by a man while signing autographs after an Orlando, Florida show Friday night. According to CNN, the man was armed with two guns, and fatally shot himself after being tackled by Grimmie's brother. Hours before the show, 22-year-old Grimmie posted an excited video on Twitter, telling fans about the performance at the Plaza Live theater. Grimmie performed at the show with the band Before You Exit, according to authorities, and had stopped along with the group to meet with fans after the show. Grimmie, who started off on YouTube and amassed a huge following, made it to the Top 3 on season 6 of The Voice.

How sleep and mental health are linked in the brain. This article is published in collaboration with The Conversation. We are only beginning to unravel the genetic and biochemical basis of mental illness – a vague term including conditions as diverse as anxiety, depression, and mood and psychotic disorders. With millions of people suffering from such conditions, it is crucial that we find ways to improve diagnosis and treatment. But an increasing body of scientific evidence is now suggesting that we should turn our attention to one of our most basic functions: sleep. Why sleep could be the key to tackling mental illness.

La chronobiologie : amie ou ennemie ? Optogenetics Resource Center. Rythmes biologiques des organismes complexes. Rythme circadien - Les gènes horlogers rythment nos journées. Vers un nouveau paradigme scientifique ? - Rhuthmos. L'horloge biologique a un chef d'orchestre. Jet Lag Cure Could Soon Be A Reality After Scientists Develop New Molecule. A New Study Delves Into How Blue Light Affects Your Metabolism. InShare3 New research suggests that blue light in the evening may have an adverse effect on how glucose is metabolized by the body. The prevalence of diabetes and other metabolic disease has been steadily increasing in the past few decades. Around half of adults in the United States have diabetes or its precursor pre-diabetes and numbers continue to rise. This disease affects millions of people worldwide. LE CERVEAU À TOUS LES NIVEAUX! Pourquoi respecter le rythme biologique.

Café des sciences sur la chronobiologie à Mulhouse. Sciences du vivant - Rhuthmos. Importance curative et préventive de la vitamine D mise à jour novembre 2015. - Chronimed. Comment définir un rythme par une méthodologie scientifique - Jean de Prins. Travail posté recommandations, Pr D. Léger, conf. sommeil et travail à horaires atypiques. Les secrets de l'horloge biologique 1-4. Les secrets de l’horloge biologique 2 4. Les secrets de l'horloge biologique 3-4. Les secrets de l'horloge biologique 4-4. #03 L'horloge biologique en 5 minutes. L'horloge biologique, Dr C. Gronfier, conf. sommeil et travail à horaires atypiques. CSHL 2015 Symposium interview Series with Ueli Schibler. Un effet de « jet-lag » induit par les anesthésies générales ? Le «jet-lag» de l'anesthésie - 8 juin 2006. Savoirs ENS. Lumière et rythmes - POM BIO. Sommeil et métabolisme - POM BIO. Multi Scale Modeling of Chromatin and Nucleosomes.

Theconversation. 10 Questions to Prof Francis Levi. Accueil. Le rythme des divisions cellulaires est couplé à celui de l’horloge biologique interne. Travail posté en "trois huit" : un risque plus élevé de syndrome métabolique. Société Française de Chronobiologie » Les rythmes circadiens et alimentaires ont des effets distincts sur la transcription des gènes. Gènes de l’horloge et cancers humains. UZH - Chronobiology and Sleep Research - PUBLICATIONS. MCTQ - Main Page. Les neurosciences révèlent le pouvoir de l'inconscient.

Articles Temps & Cerveau

Lumière anti-sommeil des tablettes, smartphones et liseuses : deux stratégies efficaces. La physiologie du sommeil. Attention et chronopsychologie. Rythmes de l'enfant. Cycle circadien. GetSharedSiteSession?rc=4&redirect= Rythmes biologiques des organismes complexes. Chronobiologie. 1) Le soleil, point de départ. Marshall Solar Physics. La pleine lune empêche bel et bien de dormir : l'étude scientifique - Sciences. La pleine lune perturbe le sommeil, montre une convaincante étude.