Author: R.M. Buijs
Publisher: Elsevier
ISBN: 0080862365
Category : Medical
Languages : en
Pages : 409

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Book Description
The International Summer School of Brain Research, on which this book is based, was organized by the Netherlands Institute for Brain research (NIBR), which has a rich history dating back to the beginning of the century.The focus of interest in this present volume of Progress in Brain Research are the few thousand neurons at the base of the hypothalamus that form the biological clock. Attention is focused on the mechanisms underlying the generation of circadian rhythmicity within our biological clock, which is still far from understood. Contributions originating from many disciplines give updates on the latest theories on the molecular and electrophysiological basis of the pacemaker mechanism, and the various approaches used in different species. Attention is also paid to the way the signal of the biological clock is transferred to the rest of the central nervous system. New data on the role of the suprachiasmatic nucleus and its impact on the functioning of the human being is presented. Altogether an excellent volume which will further the understanding of this elusive material.

Author:
Publisher:
ISBN: 9780444801043
Category : Circadian rhythms
Languages : en
Pages : 391

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Author: A. Kalsbeek
Publisher: Elsevier
ISBN: 0080463487
Category : Science
Languages : en
Pages : 431

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Book Description
The prevalence of obesity in developed countries is fast becoming a health issue on par with infectious diseases and malnutrition. Research in this area has grown substantially and includes the neurochemical pathways of the hypothalamus and its role in regulating energy expenditures in the body. This volume in the Progress in Brain Research series examines the emerging role of the hypothalamus as a crucial link between the sensing of nutrients and the control of insulin sensitivity, glucose uptake, and glucose production, the integrative role of the hypothalamus in thyroid and bone metabolism, the interaction between circadian information and energy metabolism, and the important interplay between the immune system and energy metabolism.· All contributors are recognized experts in their respective specialities· Provides expanded coverage of hypothalamic mechanisms involved in energy metabolism· Includes many outstanding full-colour illustrations· Contains special sections on circadian rhythms, immune system, thyroid and bone metabolism

Author: Ruud M. Buijs
Publisher: Elsevier Inc. Chapters
ISBN: 0128079894
Category : Medical
Languages : en
Pages : 49

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Book Description
Our biological clock, the suprachiasmatic nucleus (SCN), sets the pace of our life: it provides a rhythmic function to our sleep–wake cycle. In order to do so properly the SCN synchronizes our physiology to behavioral patterns by directing the autonomic and hormonal output of the hypothalamus to the different organs of the body that require a different setting – activity or inactivity – during particular phases of the day or night. In this chapter we show that this delicate balance requires that the SCN should not only provide an output to these organs but also be informed about the physiological state of the organs in order to adapt its output. This occurs via a hypothalamic neuronal network that provides the necessary input to the SCN. We argue that the feedback that the SCN receives from its hypothalamic target structures is essential to maintain a balance in our physiological functions, which fluctuate during the sleep–wake cycle. We propose that this crucial role of the hypothalamus in the homeostatic response is the reason why, e.g., in aging or depression, changes in the functioning of the biological clock, the SCN, lead to the development of pathology. In addition, if this balance is not adequately organized, for example, if the signals of the biological clock are violated by being active and eating during the night, as in shift work, one will be more susceptible to diseases such as hypertension, obesity, diabetes, and metabolic syndrome.

Author: Etienne Challet
Publisher: Frontiers Media SA
ISBN: 2889452824
Category :
Languages : en
Pages : 190

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Book Description
One of the major breakthroughs of the last decade in the understanding of energy homeostasis is the identification of a reciprocal control between circadian rhythmicity and cellular metabolism. Circadian rhythmicity is a fundamental endogenous process of almost every organism living on Earth. For instance, the alternation of hunger and satiety is not continuous over 24 h, but is instead structured in time along the light/dark cycle. In mammals, the temporal organization of metabolism, physiology and behavior around 24 h is controlled by a network of multiple cellular clocks, synchronized via neuronal and hormonal signals by a master clock located in the suprachiasmatic nuclei of the hypothalamus. This central circadian conductor in the brain is mainly reset by ambient light perceived by the retina, while secondary circadian clocks in other brain areas and peripheral organs can be reset by meal timing. Chronic disruption of circadian rhythms, as seen in human shift-workers (up to 20% of the active population), has been associated with the development of a number of adverse mental and metabolic conditions. Understanding of the functional links between circadian desynchronization and overall health in animal models and humans, however, is still scarce. Interactions between circadian clocks and metabolism can occur at different levels: the molecular clockwork, internal synchronization via neuro-hormonal signals, or external synchronization via photic or feeding cues. This Research Topic comprises a number of reviews as well as research and methods articles that feature recent advancements in the mechanisms linking circadian clocks with energy metabolism, and the pathophysiological implications of these interactions for metabolic health.

Author: Urs Albrecht
Publisher: Springer Science & Business Media
ISBN: 1441912622
Category : Science
Languages : en
Pages : 306

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Book Description
With the invitation to edit this volume, I wanted to take the opportunity to assemble reviews on different aspects of circadian clocks and rhythms. Although most c- tributions in this volume focus on mammalian circadian clocks, the historical int- duction and comparative clocks section illustrate the importance of various other organisms in deciphering the mechanisms and principles of circadian biology. Circadian rhythms have been studied for centuries, but only recently, a mole- lar understanding of this process has emerged. This has taken research on circadian clocks from mystic phenomenology to a mechanistic level; chains of molecular events can describe phenomena with remarkable accuracy. Nevertheless, current models of the functioning of circadian clocks are still rudimentary. This is not due to the faultiness of discovered mechanisms, but due to the lack of undiscovered processes involved in contributing to circadian rhythmicity. We know for example, that the general circadian mechanism is not regulated equally in all tissues of m- mals. Hence, a lot still needs to be discovered to get a full understanding of cir- dian rhythms at the systems level. In this respect, technology has advanced at high speed in the last years and provided us with data illustrating the sheer complexity of regulation of physiological processes in organisms. To handle this information, computer aided integration of the results is of utmost importance in order to d- cover novel concepts that ultimately need to be tested experimentally.

Author: Dick F. Swaab
Publisher: Elsevier
ISBN: 0128199768
Category : Science
Languages : en
Pages : 544

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Book Description
The Hypothalamus is an important area of the brain for understanding a variety of neurological disorders. This volume summarizes for readers the anatomy and physiology of the anterior hypothalamus, to better understand pathology and treatment of hypothalamus related disorders. In addition to anatomy and physiology in humans, cytoarchitecture and chemoarchitecture in rodents is provided. The volume explores the role of the hypothalamus in disorders of eating, sleeping, anxiety, and mood, as well as its role in sexual behavior and gender identity. Coverage includes how Parkinson's, Alzheimer's and other neurological disorders relate to the hypothalamus. - Reviews the anatomy and physiology of the anterior hypothalamus - Provides cytoarchitecture and chemoarchitecture from rodents - Discusses hypothalamic related disorders of eating, sleeping, anxiety, and mood - Covers how Parkinson's, Alzheimer's and other neurological disorders relate to the hypothalamus - Explores the role of the hypothalamus in sexual behavior and gender identity

Author: Jens Hannibal
Publisher: Springer Science & Business Media
ISBN: 3540277897
Category : Medical
Languages : en
Pages : 84

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Book Description
Rhythmic changes in physiology and behaviour within a 24 h period occur in living organisms on earth to meet the challenges associated with the daily changes in the external environment. The circadian pacemaker responsible for the temporal internal organisation and the generation of endogenous rhythms of approximately 24 h is located in the hypothalamic suprachiasmatic nucleus (SCN) in mammals. The endogenous period generated by the pacemaker is close to, but generally not equal to 24 h and the biological clock therefore needs to be daily adjusted (entrained) by external cues. The daily alteration of light and darkness due to the rotation of our planet on its own axis in relation to the sun is the most prominent "zeitgeber" which adjusts the phase of the circadian rhythms to the astronomical day length, a process known as photoentrainment. In mammals, light is perceived only through photoreceptors located in the retina. Light information is mediated to the SCN via the retinohypothalamic tract (RHT) by activation of the classical photoreceptor system of rods and cones and a more recently identified system of intrinsic photosensitive retinal ganglion cells (ipRGCs) using melanopsin as a photopigment.

Author: Jaime M. Monti
Publisher: Springer Science & Business Media
ISBN: 3764385618
Category : Medical
Languages : en
Pages : 627

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Book Description
This book focuses on the neuropsychopharmacology of serotonin and its role in sleep and wakefulness, presenting neurochemical, electrophysiological, and neuropharmacological approaches to understand the mechanisms of serotonin and related substances. Covering core and contemporary topics in the area, this volume is valuable for all researchers interested in interdisciplinary studies concerning drugs affecting the central nervous system.

Author:
Publisher:
ISBN:
Category : Circadian rhythms
Languages : en
Pages : 93

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Book Description