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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

Science: general issues --- Neurosciences --- neurotrophic factors --- BDNF (brain-derived neurotrophic factor) --- NGF (nerve growth factor) --- CNS—central nervous system --- neuronal plasticity --- neurotrophic factors --- BDNF (brain-derived neurotrophic factor) --- NGF (nerve growth factor) --- CNS—central nervous system --- neuronal plasticity

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Highly emotional events tend to be well remembered. The adaptive value in this is clear – those events that have a bearing on survival should be stored for future use as long-term memories whereas memories of inconsequential events would not as likely contribute to future survival. Enduring changes in the structure and function of synapses, neural circuitry, and ultimately behavior, can be modulated by highly aversive or rewarding experiences. In the last decade, the convergence of cellular, molecular, and systems neuroscience has produced new insights into the biological mechanisms that determine whether a memory will be stored for the long-term or lost forever. This Research Topic brings together leading experts, who work at multiple levels of analysis, to reveal recent discoveries and concepts regarding the synaptic mechanisms of consolidation and extinction of emotionally arousing memories.

Synapses. --- Neurology --- Memory, Long-Term --- Synapses --- Brain Stimulation --- Amygdala --- BDNF --- PDE4 --- reconsolidation --- Fear conditioning --- posttraumatic stress disorder --- ubiquitin-proteasome system --- CREB --- extinction --- Sleep --- gamma oscillations --- Research. --- physiology. --- Brain Stimulation --- Amygdala --- BDNF --- PDE4 --- reconsolidation --- Fear conditioning --- posttraumatic stress disorder --- ubiquitin-proteasome system --- CREB --- extinction --- Sleep --- gamma oscillations

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From an evolutionary perspective, our species has relied upon physical activity for most of its history to survive and has had to escape from predators, to scavenge for food, and to use physique to work or build necessary means for everyday life. Physical activity has been part of our evolution and progress since the very beginning and, consequently, our entire body has been programmed to be active physically. In the last 20 years, scientific research has increasingly shown that our ancient survival principle has beneficial effects not only on the cells and organs involved in physical activities but on the metabolism of the entire organism, influencing the homeostasis and integration of all bodily functions, likely stimulating the production of hormones and other regulatory molecules, with each affecting vital signalling pathways. Most of the web of factors involved in molecular signalling upon exercise are suspected to be centrally controlled by the brain, which has been reported to be deeply modified by physical activity. Such complexity requires a multifaceted approach to shed light on the molecular interactions that occur between physical activity and its outcome at a cellular level.

TFRC --- single nucleotide polymorphism --- high-density lipoprotein --- blood cell counts --- epigenetics --- intestinal microbiome --- iron metabolism --- Irisin --- exercise and health --- healthy lifestyle --- physical exercise --- single nucleotide polymorphisms --- Taiwan biobank --- obesity --- glucokinase-regulator --- ?-actinin --- body mass index --- hepatic lipase --- Taiwan Biobank --- genotyping --- myokines --- DNA-methylation --- NK --- brain health --- gene expression --- ferritin --- exercise and aging --- exercise --- endurance --- antihypertensive therapy --- genetics --- gut microbiome --- ketogenic diet --- inflammation --- PCBP1 --- PCBP2 --- marathon runners --- natural killer cell --- behavior --- aerobic exercise --- exercise and neurodegeneration --- BDNF --- gut microbiota --- physical activity --- performance --- lactate --- sport --- ketogenic diet and fat --- body fat

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This book focuses of the neurotransmission phenomenon. By definition, neurotransmitters are chemicals that enable communication, i.e., the flow of nerve impulses between nerve cells or between nerve cells and muscles and glands. Recently, one can distinguish excitatory and inhibitory mediators, both of which are endo–exogenous compounds that control the function of the whole organism. From a chemical point of view, neurotransmitters belong to many different structural groups, such as amino acids (such as glycine), peptides (such as substance P, somatostatin), monoamines (such as noradrenaline or dopamine), purine derivatives (such as adenosine), gases (such as nitrogen, NO, carbon monoxide CO), and acetylcholine. From a medical point of view, disturbances in the concentration of neurotransmitters in the body result in the occurrence of mental disorders and diseases (such as depression, schizophrenia, Parkinson’s disease) and contribute to the occurrence of dementia (including Alzheimer’s disease), among other diseases. However, the problem is much wider. These disorders can lead to a number of cardiovascular diseases and can lead to the development of vascular diseases of the brain as well as in many other organs. Therefore, pharmacological intervention is a therapy that tries to interfere with regulatory processes year after year. Such treatments improve survival, reduce the frequency of readmission, and improve patients' quality of life.

Research & information: general --- Chemistry --- white matter hyperintensities --- dysautonomia --- genetic polymorphisms --- dementia --- levodopa --- renin-angiotensin system --- orthostatic hypotension --- reserpine-induced fibromyalgia model --- vortioxetine --- ropinirole --- serotonin and dopamine in fibromyalgia --- mouse --- dopamine --- acetylcholine --- glutamate --- BDNF --- serotonin --- neurotransmitters --- statins --- neurodegenerative diseases --- stroke --- depression --- androgenetic alopecia --- 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors --- mixed dyslipidemia --- risk factors --- halogenated pyrazolines --- monoamine oxidase inhibitors --- kinetics --- reversibility --- molecular dynamics --- guanylate cyclase (GC) --- chronic heart failure (CHF) --- pulmonary arterial hypertension (PAH) --- tiagabine --- cardiac voltage-gated ion channels --- molecular modeling --- ECG study --- SGLT2i --- sodium-glucose cotransporter 2 inhibitors --- neuroprotection --- atheroprotection --- mTOR --- type 2 diabetes mellitus --- cognitive impairment --- inflammation --- oxidative stress --- antibiotics --- neurotoxicity --- adverse drug reaction --- neurotransmission --- 5-HT receptors --- gastrointestinal tract --- white matter hyperintensities --- dysautonomia --- genetic polymorphisms --- dementia --- levodopa --- renin-angiotensin system --- orthostatic hypotension --- reserpine-induced fibromyalgia model --- vortioxetine --- ropinirole --- serotonin and dopamine in fibromyalgia --- mouse --- dopamine --- acetylcholine --- glutamate --- BDNF --- serotonin --- neurotransmitters --- statins --- neurodegenerative diseases --- stroke --- depression --- androgenetic alopecia --- 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors --- mixed dyslipidemia --- risk factors --- halogenated pyrazolines --- monoamine oxidase inhibitors --- kinetics --- reversibility --- molecular dynamics --- guanylate cyclase (GC) --- chronic heart failure (CHF) --- pulmonary arterial hypertension (PAH) --- tiagabine --- cardiac voltage-gated ion channels --- molecular modeling --- ECG study --- SGLT2i --- sodium-glucose cotransporter 2 inhibitors --- neuroprotection --- atheroprotection --- mTOR --- type 2 diabetes mellitus --- cognitive impairment --- inflammation --- oxidative stress --- antibiotics --- neurotoxicity --- adverse drug reaction --- neurotransmission --- 5-HT receptors --- gastrointestinal tract

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This book is focused on the existing gap between the theoretical bioactivity of (poly)phenols and their real influence in terms of health, once ingested. Due to this, new studies are needed and some examples of new tendencies are included from in vitro and in vivo models which allow for exploring bioaccessibility, bioavailability, and bioactivity, that need to be developed to understand the actual importance of consuming functional foods, rich in these plant secondary metabolites. Moreover, current new strategies need to be developed to enhance the content of these foods, as well as setting up new formulations rich in bioaccessible and bioavailable compounds. Altogether, it could provide a new perspective in therapy, expanding the use of these natural functional compounds, ingredients, and foods in the clinical frame, reducing the use of synthetic drugs. As a result, the joint contribution of multidisciplinary experts from the areas of food science, health, and nutrition, together with the industrial sector, would help to reach these objectives. Taking this into account, diverse studies have been included in this study, which comprises different strategies to approach these objectives from different, complementary, points of view, ranging from the enrichment of by-products in bioactive compounds, through different agricultural techniques, to the assimilation of these compounds by the human body, both in vitro and in vivo, as well as by clinical studies.

Research & information: general --- Biology, life sciences --- Food & society --- cognitive function --- polyphenols --- flavonoids --- CREB protein --- BDNF --- memory --- fruits and vegetables --- cerebral blood flow --- polydatin --- resveratrol --- urate crystals --- pyrophosphate crystals --- crystal-induced inflammation --- dietary intervention --- maqui-citrus juice --- flavanones --- urinary excretion --- UHPLC-ESI-QqQ-MS/MS --- obesity --- Hibiscus sabdariffa --- Lippia citriodora --- olive --- salinity --- osmolytes --- adaptation --- secondary metabolism --- plant growth promoting rhizobacteria (PGPR) --- net photosynthesis --- oleuropein --- water use efficiency (WUE) --- phenolic compounds --- HPLC-DAD --- fluorescence detection --- flavan-3-ols --- procyanidins --- ORAC --- (+)-catechin --- (−)-epicatechin --- dark chocolate --- cranberry --- periodontal diseases --- dental biofilm --- antibacterial activity --- anti-biofilm activity --- F. nucleatum --- P. gingivalis --- A. actinomycetemcomitans --- (poly)phenols --- bioactivity --- bioavailability --- inflammation --- secondary metabolites --- antibacterial --- antioxidant --- diet --- fruit --- vegetables --- cognitive function --- polyphenols --- flavonoids --- CREB protein --- BDNF --- memory --- fruits and vegetables --- cerebral blood flow --- polydatin --- resveratrol --- urate crystals --- pyrophosphate crystals --- crystal-induced inflammation --- dietary intervention --- maqui-citrus juice --- flavanones --- urinary excretion --- UHPLC-ESI-QqQ-MS/MS --- obesity --- Hibiscus sabdariffa --- Lippia citriodora --- olive --- salinity --- osmolytes --- adaptation --- secondary metabolism --- plant growth promoting rhizobacteria (PGPR) --- net photosynthesis --- oleuropein --- water use efficiency (WUE) --- phenolic compounds --- HPLC-DAD --- fluorescence detection --- flavan-3-ols --- procyanidins --- ORAC --- (+)-catechin --- (−)-epicatechin --- dark chocolate --- cranberry --- periodontal diseases --- dental biofilm --- antibacterial activity --- anti-biofilm activity --- F. nucleatum --- P. gingivalis --- A. actinomycetemcomitans --- (poly)phenols --- bioactivity --- bioavailability --- inflammation --- secondary metabolites --- antibacterial --- antioxidant --- diet --- fruit --- vegetables