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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.

Circadian clock --- mitochondria --- feeding --- circadian desynchronization --- exercise --- cancer --- clock gene --- Alzheimer

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The small phenolic compound salicylic acid (SA) is critical for plant defense against a broad spectrum of pathogens. SA is also involved in multi-layered defense responses, from pathogen-associated molecular pattern triggered basal defense, resistance gene-mediated defense, to systemic acquired resistance. Recent decades have witnessed tremendous progress towards our understanding of SA-mediated signaling networks. Many genes have been identified to have direct or indirect effect on SA biosynthesis or to regulate SA accumulation. Several SA receptors have been identified and characterization of these receptors has shed light on the mechanisms of SA-mediated defense signaling, which encompass chromosomal remodeling, DNA repair, epigenetics, to transcriptional reprogramming. Molecules from plant-associated microbes have been identified, which manipulate SA levels and/or SA signaling. SA does not act alone. It engages in crosstalk with other signaling pathways, such as those mediated by other phytohormones, in an agonistic or antagonistic manner, depending on hormones and pathosystems. Besides affecting plant innate immunity, SA has also been implicated in other cellular processes, such as flowering time determination, lipid metabolism, circadian clock control, and abiotic stress responses, possibly contributing to the regulation of plant development. The multifaceted function of SA makes it critically important to further identify genes involved in SA signaling networks, understand their modes of action, and delineate interactions among the components of SA signaling networks. In addition, genetic manipulation of genes involved in SA signaling networks has also provided a promising approach to enhance disease resistance in economically important plants. This ebook collects articles in the Research Topic "Salicylic Acid Signaling Networks". For this collection we solicited reviews, perspectives, and original research articles that highlight recent exciting progress on the understanding of molecular mechanisms underlying SA-mediated defense, SA-crosstalk with other pathways and how microbes impact these events.

Circadian clock --- systemic acquired resistance --- Reactive Oxygen Species --- crosstalk --- pathogen effector --- NPR1 --- Cellular redox --- Lipid Metabolism --- flowering --- SA receptors --- Circadian clock --- systemic acquired resistance --- Reactive Oxygen Species --- crosstalk --- pathogen effector --- NPR1 --- Cellular redox --- Lipid Metabolism --- flowering --- SA receptors

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The small phenolic compound salicylic acid (SA) is critical for plant defense against a broad spectrum of pathogens. SA is also involved in multi-layered defense responses, from pathogen-associated molecular pattern triggered basal defense, resistance gene-mediated defense, to systemic acquired resistance. Recent decades have witnessed tremendous progress towards our understanding of SA-mediated signaling networks. Many genes have been identified to have direct or indirect effect on SA biosynthesis or to regulate SA accumulation. Several SA receptors have been identified and characterization of these receptors has shed light on the mechanisms of SA-mediated defense signaling, which encompass chromosomal remodeling, DNA repair, epigenetics, to transcriptional reprogramming. Molecules from plant-associated microbes have been identified, which manipulate SA levels and/or SA signaling. SA does not act alone. It engages in crosstalk with other signaling pathways, such as those mediated by other phytohormones, in an agonistic or antagonistic manner, depending on hormones and pathosystems. Besides affecting plant innate immunity, SA has also been implicated in other cellular processes, such as flowering time determination, lipid metabolism, circadian clock control, and abiotic stress responses, possibly contributing to the regulation of plant development. The multifaceted function of SA makes it critically important to further identify genes involved in SA signaling networks, understand their modes of action, and delineate interactions among the components of SA signaling networks. In addition, genetic manipulation of genes involved in SA signaling networks has also provided a promising approach to enhance disease resistance in economically important plants. This ebook collects articles in the Research Topic "Salicylic Acid Signaling Networks". For this collection we solicited reviews, perspectives, and original research articles that highlight recent exciting progress on the understanding of molecular mechanisms underlying SA-mediated defense, SA-crosstalk with other pathways and how microbes impact these events.

Circadian clock --- systemic acquired resistance --- Reactive Oxygen Species --- crosstalk --- pathogen effector --- NPR1 --- Cellular redox --- Lipid Metabolism --- flowering --- SA receptors

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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

Computational probability --- mathematical modeling --- stochastic processes --- simulation --- complex networks --- circadian clock mathematics --- DNA walks --- value chains --- option pricing --- magnus and lift forces

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The prevalence of obesity and its comorbidities, particularly type 2 diabetes, cardiovascular and hepatic disease and certain cancers, continues to rise worldwide. Paradoxically, despite an increasingly obesogenic environment, particularly in Western societies, undernutrition is also extremely common. The application of novel, sophisticated techniques, particularly related to imaging and molecular biology, has substantially advanced our understanding of the mechanisms controlling appetite and energy intake. This has led to a redefinition of many concepts, including the relative importance of central versus peripheral mechanisms, recognising that the gastrointestinal (GI) tract, particularly gut hormones, plays a critical role. Given the major advance in knowledge in the field, this Special Issue provides a comprehensive overview of the GI mechanisms underlying the regulation of appetite and energy intake, as a series of definitive reviews by international authorities. The reviews address gut-related mechanisms, including nutrient sensing, gut hormones and GI motility, gut-brain communication, including the roles of the vagus and the modulation of reward perception, the roles of diet and the microbiota, as well as the abnormalities associated with eating disorders, specifically obesity and anorexia of ageing, and the beneficial effects of bariatric surgery. The reviews cover both preclinical research and studies in humans, and are complemented by a number of important original papers.

Medicine --- lixisenatide --- intragastric meal retention --- energy intake --- type 2 diabetes --- obesity --- amino acid --- isoleucine --- chronic supplementation --- energy expenditure --- oral glucose tolerance test --- glycaemic control --- gastric emptying breath test --- endocannabinoid --- cannabinoid CB1 receptor --- gut-brain --- intestine --- western diet --- preference --- whey protein --- gastric emptying --- appetite --- lifecourse --- gut hormones --- hunger --- protein --- TAS2R5 --- TAS2R39 --- TAS2R14 --- agonist --- food intake --- GLP1 --- CCK --- PYY --- miniature pig --- pig model --- functional brain imaging --- molecular imaging --- vagal afferents --- single fiber recording --- insulin resistance --- GLP-1r --- gastric barostat --- scintigraphy --- meal ingestion --- postprandial responses --- hedonic sensations --- homeostatic sensations --- abdominal wall activity --- abdominal distension --- taste --- fat --- carbohydrate --- bariatric surgery --- GLP-1 --- ghrelin --- Roux-en-Y gastric bypass --- gastric band --- sleeve gastrectomy --- circadian --- gastrointestinal tract --- enteroendocrine cells --- chemosensory --- GIP --- nutrients --- hormones --- food ingestion --- digestion --- satiety --- digestive well-being --- functional gastrointestinal disorders --- postprandial symptoms --- brainstem --- vagus --- feeding --- gastrointestinal --- cue reactivity --- meal anticipation --- motivation --- nutrient preference --- flavor --- aversion --- bile acids --- TGR-5 --- FXR --- gastrointestinal hormones --- body weight --- gastric accommodation --- satiation --- CB1 receptor --- gut-brain --- reward --- aging --- whey --- anorexia --- supplements --- sarcopenia --- nutrient sensing --- enteroendocrine cells (EECs) --- appetite regulation --- G-protein coupled receptors (GPCRs) --- bitter substances --- gastric motor function --- postprandial blood glucose --- preclinical studies --- human studies --- texture --- oro-sensory exposure --- sensory science --- cephalic responses --- brain areas --- brain stem --- weight management --- intestinal brake --- duodenal jejunal and ileal brake --- tastants --- circadian clock --- gastric bypass surgery --- microbiome --- hypothalamus --- lixisenatide --- intragastric meal retention --- energy intake --- type 2 diabetes --- obesity --- amino acid --- isoleucine --- chronic supplementation --- energy expenditure --- oral glucose tolerance test --- glycaemic control --- gastric emptying breath test --- endocannabinoid --- cannabinoid CB1 receptor --- gut-brain --- intestine --- western diet --- preference --- whey protein --- gastric emptying --- appetite --- lifecourse --- gut hormones --- hunger --- protein --- TAS2R5 --- TAS2R39 --- TAS2R14 --- agonist --- food intake --- GLP1 --- CCK --- PYY --- miniature pig --- pig model --- functional brain imaging --- molecular imaging --- vagal afferents --- single fiber recording --- insulin resistance --- GLP-1r --- gastric barostat --- scintigraphy --- meal ingestion --- postprandial responses --- hedonic sensations --- homeostatic sensations --- abdominal wall activity --- abdominal distension --- taste --- fat --- carbohydrate --- bariatric surgery --- GLP-1 --- ghrelin --- Roux-en-Y gastric bypass --- gastric band --- sleeve gastrectomy --- circadian --- gastrointestinal tract --- enteroendocrine cells --- chemosensory --- GIP --- nutrients --- hormones --- food ingestion --- digestion --- satiety --- digestive well-being --- functional gastrointestinal disorders --- postprandial symptoms --- brainstem --- vagus --- feeding --- gastrointestinal --- cue reactivity --- meal anticipation --- motivation --- nutrient preference --- flavor --- aversion --- bile acids --- TGR-5 --- FXR --- gastrointestinal hormones --- body weight --- gastric accommodation --- satiation --- CB1 receptor --- gut-brain --- reward --- aging --- whey --- anorexia --- supplements --- sarcopenia --- nutrient sensing --- enteroendocrine cells (EECs) --- appetite regulation --- G-protein coupled receptors (GPCRs) --- bitter substances --- gastric motor function --- postprandial blood glucose --- preclinical studies --- human studies --- texture --- oro-sensory exposure --- sensory science --- cephalic responses --- brain areas --- brain stem --- weight management --- intestinal brake --- duodenal jejunal and ileal brake --- tastants --- circadian clock --- gastric bypass surgery --- microbiome --- hypothalamus