1 4672 118 NEW INSIGHTS INTO THE MECHANISMS OF THE KETOGENIC DIET. PURPOSE OF REVIEW: HIGH-FAT, LOW-CARBOHYDRATE KETOGENIC DIETS HAVE BEEN USED FOR ALMOST A CENTURY FOR THE TREATMENT OF EPILEPSY. USED TRADITIONALLY FOR THE TREATMENT OF REFRACTORY PEDIATRIC EPILEPSIES, IN RECENT YEARS THE USE OF KETOGENIC DIETS HAS EXPERIENCED A REVIVAL TO INCLUDE THE TREATMENT OF ADULTHOOD EPILEPSIES AS WELL AS CONDITIONS RANGING FROM AUTISM TO CHRONIC PAIN AND CANCER. DESPITE THE ABILITY OF KETOGENIC DIET THERAPY TO SUPPRESS SEIZURES REFRACTORY TO ANTIEPILEPTIC DRUGS AND REPORTS OF LASTING SEIZURE FREEDOM, THE UNDERLYING MECHANISMS ARE POORLY UNDERSTOOD. THIS REVIEW EXPLORES NEW INSIGHTS INTO MECHANISMS MOBILIZED BY KETOGENIC DIET THERAPIES. RECENT FINDINGS: KETOGENIC DIETS ACT THROUGH A COMBINATION OF MECHANISMS, WHICH ARE LINKED TO THE EFFECTS OF KETONES AND GLUCOSE RESTRICTION, AND TO INTERACTIONS WITH RECEPTORS, CHANNELS, AND METABOLIC ENZYMES. DECANOIC ACID, A COMPONENT OF MEDIUM-CHAIN TRICLYCERIDES, CONTRIBUTES TO SEIZURE CONTROL THROUGH DIRECT ALPHA-AMINO-3-HYDROXY-5-METHYL-4-ISOXAZOLEPROPIONIC ACID (AMPA) RECEPTOR INHIBITION, WHEREAS DRUGS TARGETING LACTATE DEHYDROGENASE REDUCE SEIZURES THROUGH INHIBITION OF A METABOLIC PATHWAY. KETOGENIC DIET THERAPY ALSO AFFECTS DNA METHYLATION, A NOVEL EPIGENETIC MECHANISM OF THE DIET. SUMMARY: KETOGENIC DIET THERAPY COMBINES SEVERAL BENEFICIAL MECHANISMS THAT PROVIDE BROAD BENEFITS FOR THE TREATMENT OF EPILEPSY WITH THE POTENTIAL TO NOT ONLY SUPPRESS SEIZURES BUT ALSO TO MODIFY THE COURSE OF THE EPILEPSY. 2017 2 128 31 A UNIFYING MECHANISM OF KETOGENIC DIET ACTION: THE MULTIPLE ROLES OF NICOTINAMIDE ADENINE DINUCLEOTIDE. THE ABILITY OF A KETOGENIC DIET TO TREAT SEIZURES AND RENDER A NEURONAL NETWORK MORE RESISTANT TO STRONG ELECTRICAL ACTIVITY HAS BEEN OBSERVED FOR A CENTURY IN CLINICS AND FOR DECADES IN RESEARCH LABORATORIES. ALONGSIDE ONGOING EFFORTS TO UNDERSTAND HOW THIS THERAPY WORKS TO STOP SEIZURES, METABOLIC HEALTH IS INCREASINGLY APPRECIATED AS CRITICAL BUFFER TO RESISTING AND RECOVERING FROM ACUTE AND CHRONIC DISEASE. ACCORDINGLY, LINKS BETWEEN METABOLISM AND HEALTH, AND THE BROADER EMERGING IMPACT OF THE KETOGENIC DIET IN IMPROVING DIVERSE METABOLIC, IMMUNOLOGICAL AND NEUROLOGICAL CONDITIONS, HAVE SERVED TO INTENSIFY THE SEARCH FOR ITS KEY AND/OR COMMON MECHANISMS. HERE WE REVIEW DIVERSE EVIDENCE FOR INCREASED LEVELS OF NAD(+), AND THUS AN ALTERED RATIO OF NAD(+)/NADH, DURING METABOLIC THERAPY WITH A KETOGENIC DIET. WE PROPOSE THIS AS A POTENTIAL UNIFYING MECHANISM, AND HIGHLIGHT SOME OF THE EVIDENCE LINKING ALTERED NAD(+)/NADH WITH REDUCED SEIZURES AND WITH A RANGE OF SHORT AND LONG-TERM CHANGES ASSOCIATED WITH THE BENEFICIAL EFFECTS OF A KETOGENIC DIET. AN INCREASE IN NAD(+)/NADH IS CONSISTENT WITH MULTIPLE LINES OF EVIDENCE AND HYPOTHESES, AND THEREFORE WE SUGGEST THAT INCREASED NAD(+) MAY BE A COMMON MECHANISM UNDERLYING BENEFICIAL EFFECTS OF KETOGENIC DIET THERAPY. 2020 3 2498 41 EPIGENETICS AND EPILEPSY PREVENTION: THE THERAPEUTIC POTENTIAL OF ADENOSINE AND METABOLIC THERAPIES. PREVENTION OF EPILEPSY AND ITS PROGRESSION REMAINS THE MOST URGENT NEED FOR EPILEPSY RESEARCH AND THERAPY DEVELOPMENT. NOVEL CONCEPTUAL ADVANCES ARE REQUIRED TO MEANINGFULLY ADDRESS THIS FUNDAMENTAL CHALLENGE. MALADAPTIVE EPIGENETIC CHANGES, WHICH INCLUDE METHYLATION OF DNA AND ACETYLATION OF HISTONES - AMONG OTHER MECHANISMS, ARE NOW WELL RECOGNIZED TO PLAY A FUNCTIONAL ROLE IN THE DEVELOPMENT OF EPILEPSY AND ITS PROGRESSION. THE METHYLATION HYPOTHESIS OF EPILEPTOGENESIS SUGGESTS THAT CHANGES IN DNA METHYLATION ARE IMPLICATED IN THE PROGRESSION OF THE DISEASE. IN THIS CONTEXT, GLOBAL DNA HYPERMETHYLATION IS PARTICULARLY ASSOCIATED WITH CHRONIC EPILEPSY. LIKEWISE, ACETYLATION CHANGES OF HISTONES HAVE BEEN LINKED TO EPILEPSY DEVELOPMENT. CLINICAL AS WELL AS EXPERIMENTAL EVIDENCE DEMONSTRATE THAT EPILEPSY AND ITS PROGRESSION CAN BE PREVENTED BY METABOLIC AND BIOCHEMICAL MANIPULATIONS THAT TARGET PREVIOUSLY UNRECOGNIZED EPIGENETIC FUNCTIONS CONTRIBUTING TO EPILEPSY DEVELOPMENT AND MAINTENANCE OF THE EPILEPTIC STATE. THIS REVIEW WILL DISCUSS EPIGENETIC MECHANISMS IMPLICATED IN EPILEPSY DEVELOPMENT AS WELL AS METABOLIC AND BIOCHEMICAL INTERACTIONS THOUGHT TO DRIVE EPILEPTOGENESIS. THEREFORE, METABOLIC AND BIOCHEMICAL MECHANISMS ARE IDENTIFIED AS NOVEL TARGETS FOR EPILEPSY PREVENTION. WE WILL SPECIFICALLY DISCUSS ADENOSINE BIOCHEMISTRY AS A NOVEL THERAPEUTIC STRATEGY TO RECONSTRUCT THE DNA METHYLOME AS ANTIEPILEPTOGENIC STRATEGY AS WELL AS METABOLIC MEDIATORS, SUCH AS BETA-HYDROXYBUTYRATE, WHICH AFFECT HISTONE ACETYLATION. FINALLY, METABOLIC DIETARY INTERVENTIONS (SUCH AS THE KETOGENIC DIET) WHICH HAVE THE UNIQUE POTENTIAL TO PREVENT EPILEPTOGENESIS THROUGH RECENTLY IDENTIFIED EPIGENETIC MECHANISMS WILL BE REVIEWED. THIS ARTICLE IS PART OF THE SPECIAL ISSUE ENTITLED 'NEW EPILEPSY THERAPIES FOR THE 21ST CENTURY - FROM ANTISEIZURE DRUGS TO PREVENTION, MODIFICATION AND CURE OF EPILEPSY'. 2020 4 239 44 ADENOSINERGIC SIGNALING IN EPILEPSY. DESPITE THE INTRODUCTION OF AT LEAST 20 NEW ANTIEPILEPTIC DRUGS (AEDS) INTO CLINICAL PRACTICE OVER THE PAST DECADES, ABOUT ONE THIRD OF ALL EPILEPSIES REMAIN REFRACTORY TO CONVENTIONAL FORMS OF TREATMENT. IN ADDITION, CURRENTLY USED AEDS HAVE BEEN DEVELOPED TO SUPPRESS NEURONAL HYPEREXCITABILITY, BUT NOT NECESSARILY TO ADDRESS PATHOGENIC MECHANISMS INVOLVED IN EPILEPSY DEVELOPMENT OR PROGRESSION (EPILEPTOGENESIS). FOR THOSE REASONS ENDOGENOUS SEIZURE CONTROL MECHANISMS OF THE BRAIN MAY PROVIDE ALTERNATIVE THERAPEUTIC OPPORTUNITIES. ADENOSINE IS A WELL CHARACTERIZED ENDOGENOUS ANTICONVULSANT AND SEIZURE TERMINATOR OF THE BRAIN. SEVERAL LINES OF EVIDENCE SUGGEST THAT ENDOGENOUS ADENOSINE-MEDIATED SEIZURE CONTROL MECHANISMS FAIL IN CHRONIC EPILEPSY, WHEREAS THERAPEUTIC ADENOSINE AUGMENTATION EFFECTIVELY PREVENTS EPILEPTIC SEIZURES, EVEN THOSE THAT ARE REFRACTORY TO CONVENTIONAL AEDS. NEW FINDINGS DEMONSTRATE THAT DYSREGULATION OF ADENOSINERGIC MECHANISMS ARE INTRICATELY INVOLVED IN THE DEVELOPMENT OF EPILEPSY AND ITS COMORBIDITIES, WHEREAS ADENOSINE-ASSOCIATED EPIGENETIC MECHANISMS MAY PLAY A ROLE IN EPILEPTOGENESIS. THE FIRST GOAL OF THIS REVIEW IS TO DISCUSS HOW MALADAPTIVE CHANGES OF ADENOSINERGIC MECHANISMS CONTRIBUTE TO THE EXPRESSION OF SEIZURES (ICTOGENESIS) AND THE DEVELOPMENT OF EPILEPSY (EPILEPTOGENESIS) BY FOCUSING ON PHARMACOLOGICAL (ADENOSINE RECEPTOR DEPENDENT) AND BIOCHEMICAL (ADENOSINE RECEPTOR INDEPENDENT) MECHANISMS AS WELL AS ON ENZYMATIC AND TRANSPORT BASED MECHANISMS THAT CONTROL THE AVAILABILITY (HOMEOSTASIS) OF ADENOSINE. THE SECOND GOAL OF THIS REVIEW IS TO HIGHLIGHT INNOVATIVE ADENOSINE-BASED OPPORTUNITIES FOR THERAPEUTIC INTERVENTION AIMED AT RECONSTRUCTING NORMAL ADENOSINE FUNCTION AND SIGNALING FOR IMPROVED SEIZURE CONTROL IN CHRONIC EPILEPSY. NEW FINDINGS SUGGEST THAT TRANSIENT ADENOSINE AUGMENTATION CAN HAVE LASTING EPIGENETIC EFFECTS WITH DISEASE MODIFYING AND ANTIEPILEPTOGENIC OUTCOME. THIS ARTICLE IS PART OF THE SPECIAL ISSUE ENTITLED 'PURINES IN NEURODEGENERATION AND NEUROREGENERATION'. 2016 5 6024 37 THE BIOCHEMISTRY AND EPIGENETICS OF EPILEPSY: FOCUS ON ADENOSINE AND GLYCINE. EPILEPSY, ONE OF THE MOST PREVALENT NEUROLOGICAL CONDITIONS, PRESENTS AS A COMPLEX DISORDER OF NETWORK HOMEOSTASIS CHARACTERIZED BY SPONTANEOUS NON-PROVOKED SEIZURES AND ASSOCIATED COMORBIDITIES. CURRENTLY USED ANTIEPILEPTIC DRUGS HAVE BEEN DESIGNED TO SUPPRESS NEURONAL HYPEREXCITABILITY AND THEREBY TO SUPPRESS EPILEPTIC SEIZURES. HOWEVER, THE CURRENT ARMAMENTARIUM OF ANTIEPILEPTIC DRUGS IS NOT EFFECTIVE IN OVER 30% OF PATIENTS, DOES NOT AFFECT THE COMORBIDITIES OF EPILEPSY, AND DOES NOT PREVENT THE DEVELOPMENT AND PROGRESSION OF EPILEPSY (EPILEPTOGENESIS). PREVENTION OF EPILEPSY AND ITS PROGRESSION REMAINS THE HOLY GRAIL FOR EPILEPSY RESEARCH AND THERAPY DEVELOPMENT, REQUIRING NOVEL CONCEPTUAL ADVANCES TO FIND A SOLUTION TO THIS URGENT MEDICAL NEED. THE METHYLATION HYPOTHESIS OF EPILEPTOGENESIS SUGGESTS THAT CHANGES IN DNA METHYLATION ARE IMPLICATED IN THE PROGRESSION OF THE DISEASE. IN PARTICULAR, GLOBAL DNA HYPERMETHYLATION APPEARS TO BE ASSOCIATED WITH CHRONIC EPILEPSY. CLINICAL AS WELL AS EXPERIMENTAL EVIDENCE DEMONSTRATES THAT EPILEPSY AND ITS PROGRESSION CAN BE PREVENTED BY BIOCHEMICAL MANIPULATIONS AND THOSE THAT TARGET PREVIOUSLY UNRECOGNIZED EPIGENETIC FUNCTIONS CONTRIBUTING TO EPILEPSY DEVELOPMENT AND MAINTENANCE OF THE EPILEPTIC STATE. THIS MINI-REVIEW WILL DISCUSS, EPIGENETIC MECHANISMS IMPLICATED IN EPILEPTOGENESIS AND BIOCHEMICAL INTERACTIONS BETWEEN ADENOSINE AND GLYCINE AS A CONCEPTUAL ADVANCE TO UNDERSTAND THE CONTRIBUTION OF MALADAPTIVE CHANGES IN BIOCHEMISTRY AS A MAJOR CONTRIBUTING FACTOR TO THE DEVELOPMENT OF EPILEPSY. NEW FINDINGS BASED ON BIOCHEMICAL MANIPULATION OF THE DNA METHYLOME SUGGEST THAT: (I) EPIGENETIC MECHANISMS PLAY A FUNCTIONAL ROLE IN EPILEPTOGENESIS; AND (II) THERAPEUTIC RECONSTRUCTION OF THE EPIGENOME IS AN EFFECTIVE ANTIEPILEPTOGENIC THERAPY. 2016 6 2536 37 EPIGENETICS IN EPILEPSY. EPILEPSY AFFECTS OVER 50 MILLION INDIVIDUALS GLOBALLY, MAKING IT THE MOST PREVALENT CHRONIC AND SERIOUS NEUROLOGICAL CONDITION. A PRECISE THERAPEUTIC STRATEGY IS COMPLICATED BY POOR UNDERSTANDING OF THE PATHOLOGICAL CHANGES IN EPILEPSY THUS, 30% OF TLE PATIENTS ARE RESISTANT TO DRUG THERAPY. IN THE BRAIN, EPIGENETIC PROCESSES TRANSLATE INFORMATION FROM TRANSIENT CELLULAR IMPULSES AND ADJUSTMENTS IN NEURONAL ACTIVITY INTO LONG-LASTING IMPACTS ON GENE EXPRESSION. RESEARCH SUGGESTS THAT EPIGENETIC PROCESSES CAN BE MANIPULATED IN THE FUTURE TO TREAT OR PREVENT EPILEPSY AS EPIGENETICS HAS BEEN SHOWN TO HAVE A PROFOUND INFLUENCE ON HOW GENES ARE EXPRESSED IN EPILEPSY. AS WELL AS BEING POTENTIAL BIOMARKERS FOR EPILEPSY DIAGNOSIS, EPIGENETIC CHANGES CAN ALSO BE USED AS PROGNOSTIC INDICATORS OF TREATMENT RESPONSE. IN THIS CHAPTER, WE REVIEW THE MOST RECENT FINDINGS IN SEVERAL MOLECULAR PATHWAYS LINKED WITH THE PATHOGENESIS OF TLE THAT ARE CONTROLLED BY EPIGENETIC MECHANISMS HIGHLIGHTING THEIR POTENTIAL UTILITY AS BIOMARKERS FOR UPCOMING TREATMENT STRATEGIES. 2023 7 2094 32 EPIGENETIC EFFECTS MEDIATED BY ANTIEPILEPTIC DRUGS AND THEIR POTENTIAL APPLICATION. AN EPIGENETIC EFFECT MAINLY REFERS TO A HERITABLE MODULATION IN GENE EXPRESSION IN THE SHORT TERM BUT DOES NOT INVOLVE ALTERATIONS IN THE DNA ITSELF. EPIGENETIC MOLECULAR MECHANISMS INCLUDE DNA METHYLATION, HISTONE MODIFICATION, AND UNTRANSLATED RNA REGULATION. ANTIEPILEPTIC DRUGS HAVE DRAWN ATTENTION TO BIOLOGICAL AND TRANSLATIONAL MEDICINE BECAUSE THEIR IMPACT ON EPIGENETIC MECHANISMS WILL LEAD TO THE IDENTIFICATION OF NOVEL BIOMARKERS AND POSSIBLE THERAPEUTIC STRATEGIES FOR THE PREVENTION AND TREATMENT OF VARIOUS DISEASES RANGING FROM NEUROPSYCHOLOGICAL DISORDERS TO CANCERS AND OTHER CHRONIC CONDITIONS. HOWEVER, THESE TRANSCRIPTIONAL AND POSTTRANSCRIPTIONAL ALTERATIONS CAN ALSO RESULT IN ADVERSE REACTIONS AND TOXICITY IN VITRO AND IN VIVO. HENCE, IN THIS REVIEW, WE FOCUS ON RECENT FINDINGS SHOWING EPIGENETIC PROCESSES MEDIATED BY ANTIEPILEPTIC DRUGS TO ELUCIDATE THEIR APPLICATION IN MEDICAL EXPERIMENTS AND SHED LIGHT ON EPIGENETIC RESEARCH FOR MEDICINAL PURPOSES. 2020 8 262 23 ADVANCES IN THE POTENTIAL BIOMARKERS OF EPILEPSY. EPILEPSY IS A GROUP OF CHRONIC NEUROLOGICAL DISORDERS CHARACTERIZED BY RECURRENT, SPONTANEOUS, AND UNPREDICTABLE SEIZURES. IT IS ONE OF THE MOST COMMON NEUROLOGICAL DISORDERS, AFFECTING TENS OF MILLIONS OF PEOPLE WORLDWIDE. COMPREHENSIVE STUDIES ON EPILEPSY IN RECENT DECADES HAVE REVEALED THE COMPLEXITY OF EPILEPTOGENESIS, IN WHICH IMMUNOLOGICAL PROCESSES, EPIGENETIC MODIFICATIONS, AND STRUCTURAL CHANGES IN NEURONAL TISSUES HAVE BEEN IDENTIFIED AS PLAYING A CRUCIAL ROLE. THIS REVIEW DISCUSSES THE RECENT ADVANCES IN THE BIOMARKERS OF EPILEPSY. WE EVALUATE THE POSSIBLE MOLECULAR BACKGROUND UNDERLYING THE CLINICAL CHANGES OBSERVED IN RECENT STUDIES, FOCUSING ON THERAPEUTIC INVESTIGATIONS, AND THE EVIDENCE OF THEIR SAFETY AND EFFICACY IN THE HUMAN POPULATION. THIS ARTICLE REVIEWS THE PATHOPHYSIOLOGY OF EPILEPSY, INCLUDING RECENT REPORTS ON THE EFFECTS OF OXIDATIVE STRESS AND HYPOXIA, AND FOCUSES ON SPECIFIC BIOMARKERS AND THEIR CLINICAL IMPLICATIONS, ALONG WITH FURTHER PERSPECTIVES IN EPILEPSY RESEARCH. 2019 9 2141 38 EPIGENETIC INTERVENTIONS FOR EPILEPTOGENESIS: A NEW FRONTIER FOR CURING EPILEPSY. THIS ARTICLE HIGHLIGHTS THE EMERGING THERAPEUTIC POTENTIAL OF SPECIFIC EPIGENETIC MODULATORS AS PROMISING ANTIEPILEPTOGENIC OR DISEASE-MODIFYING AGENTS FOR CURING EPILEPSY. CURRENTLY, THERE IS AN UNMET NEED FOR ANTIEPILEPTOGENIC AGENTS THAT TRULY PREVENT THE DEVELOPMENT OF EPILEPSY IN PEOPLE AT RISK. THERE IS STRONG EVIDENCE THAT EPIGENETIC SIGNALING, WHICH EXERTS HIGH FIDELITY REGULATION OF GENE EXPRESSION, PLAYS A CRUCIAL ROLE IN THE PATHOPHYSIOLOGY OF EPILEPTOGENESIS AND CHRONIC EPILEPSY. THESE MODIFICATIONS ARE NOT HARD-WIRED INTO THE GENOME AND ARE CONSTANTLY REPROGRAMMED BY ENVIRONMENTAL INFLUENCES. THE POTENTIAL EPIGENETIC MECHANISMS, INCLUDING HISTONE MODIFICATIONS, DNA METHYLATION, MICRORNA-BASED TRANSCRIPTIONAL CONTROL, AND BROMODOMAIN READING ACTIVITY, CAN DRASTICALLY ALTER THE NEURONAL GENE EXPRESSION PROFILE BY EXERTING THEIR SUMMATIVE EFFECTS IN A COORDINATED FASHION. SUCH AN EPIGENETIC INTERVENTION APPEARS MORE RATIONAL STRATEGY FOR PREVENTING EPILEPSY BECAUSE IT TARGETS THE PRIMARY PATHWAY THAT INITIALLY TRIGGERS THE NUMEROUS DOWNSTREAM CELLULAR AND MOLECULAR EVENTS MEDIATING EPILEPTOGENESIS. AMONG CURRENTLY APPROVED EPIGENETIC DRUGS, THE MAJORITY ARE ANTICANCER DRUGS WITH WELL-ESTABLISHED PROFILES IN CLINICAL TRIALS AND PRACTICE. EVIDENCE FROM PRECLINICAL STUDIES SUPPORTS THE PREMISE THAT THESE DRUGS MAY BE APPLIED TO A WIDE RANGE OF BRAIN DISORDERS. TARGETING HISTONE DEACETYLATION BY INHIBITING HISTONE DEACETYLASE ENZYMES APPEARS TO BE ONE PROMISING EPIGENETIC THERAPY SINCE CERTAIN INHIBITORS HAVE BEEN SHOWN TO PREVENT EPILEPTOGENESIS IN ANIMAL MODELS. HOWEVER, DEVELOPING NEURONAL SPECIFIC EPIGENETIC MODULATORS REQUIRES RATIONAL, PATHOPHYSIOLOGY-BASED OPTIMIZATION TO EFFICIENTLY INTERCEPT THE UPSTREAM PATHWAYS IN EPILEPTOGENESIS. OVERALL, EPIGENETIC AGENTS HAVE BEEN WELL POSITIONED AS NEW FRONTIER TOOLS TOWARDS THE NATIONAL GOAL OF CURING EPILEPSY. 2017 10 5926 38 TARGETING EPIGENETIC MECHANISMS FOR CHRONIC PAIN: A VALID APPROACH FOR THE DEVELOPMENT OF NOVEL THERAPEUTICS. CHRONIC PAIN IS A MULTIFACETED AND COMPLEX CONDITION. BROADLY CLASSIFIED INTO SOMATIC, VISCERAL, OR NEUROPATHIC PAIN, IT IS POORLY MANAGED DESPITE ITS PREVALENCE. CURRENT DRUGS USED FOR THE TREATMENT OF CHRONIC PAIN ARE LIMITED BY TOLERANCE WITH LONG-TERM USE, ABUSE POTENTIAL, AND MULTIPLE ADVERSE SIDE EFFECTS. THE PERSISTENT NATURE OF PAIN SUGGESTS THAT EPIGENETIC MACHINERY MAY BE A CRITICAL FACTOR DRIVING CHRONIC PAIN. IN THIS REVIEW, WE DISCUSS THE LATEST INSIGHTS INTO EPIGENETIC PROCESSES, INCLUDING DNA METHYLATION, HISTONE MODIFICATIONS, AND MICRORNAS, AND WE DESCRIBE THEIR INVOLVEMENT IN THE PATHOPHYSIOLOGY OF CHRONIC PAIN AND WHETHER EPIGENETIC MODIFICATIONS COULD BE APPLIED AS FUTURE THERAPEUTIC TARGETS FOR CHRONIC PAIN. WE PROVIDE EVIDENCE FROM EXPERIMENTAL MODELS AND TRANSLATIONAL RESEARCH IN HUMAN TISSUE THAT HAVE ENHANCED OUR UNDERSTANDING OF EPIGENETIC PROCESSES MEDIATING NOCICEPTION, AND WE THEN SPECULATE ON THE POTENTIAL FUTURE USE OF MORE SPECIFIC AND SELECTIVE AGENTS THAT TARGET EPIGENETIC MECHANISMS TO ATTENUATE PAIN. 2016 11 5047 33 PHARMACOLOGICAL AND THERAPEUTIC APPROACHES IN THE TREATMENT OF EPILEPSY. EPILEPSY AFFECTS AROUND 50 MILLION PEOPLE ACROSS THE GLOBE AND IS THE THIRD MOST COMMON CHRONIC BRAIN DISORDER. IT IS A NON-COMMUNICABLE DISEASE OF THE BRAIN THAT AFFECTS PEOPLE OF ALL AGES. IT IS ACCOMPANIED BY DEPRESSION, ANXIETY, AND SUBSTANTIALLY INCREASED MORBIDITY AND MORTALITY. A LARGE NUMBER OF THIRD-GENERATION ANTI-EPILEPTIC DRUGS ARE AVAILABLE, BUT THEY HAVE MULTIPLE SIDE-EFFECTS CAUSING A DECLINE IN THE QUALITY OF LIFE. THE INHERITANCE AND ETIOLOGY OF EPILEPSY ARE COMPLEX WITH MULTIPLE UNDERLYING GENETIC AND EPIGENETIC MECHANISMS. DIFFERENT NEUROTRANSMITTERS PLAY INTRICATE FUNCTIONS TO MAINTAIN THE NORMAL PHYSIOLOGY OF VARIOUS NEURONS. IF THERE IS ANY DYSREGULATION OF NEUROTRANSMISSION DUE TO ABERRANT TRANSMITTER LEVELS OR THEIR RECEPTOR BIOLOGY, IT CAN RESULT IN SEIZURES. IN THIS REVIEW, WE HAVE DISCUSSED THE ROLES PLAYED BY VARIOUS NEUROTRANSMITTERS AND THEIR RECEPTORS IN THE PATHOPHYSIOLOGY OF EPILEPSY. DRUG-RESISTANT EPILEPSY (DRE) HAS REMAINED ONE OF THE FOREFRONT AREAS OF EPILEPSY RESEARCH FOR A LONG TIME. UNDERSTANDING THE MECHANISMS UNDERLYING DRE IS OF UTMOST IMPORTANCE BECAUSE OF ITS HIGH INCIDENCE RATE AMONG EPILEPSY PATIENTS AND INCREASED RISKS OF PSYCHOSOCIAL PROBLEMS AND PREMATURE DEATH. HERE WE HAVE ENUMERATED VARIOUS HYPOTHESES OF DRE. FURTHER, WE HAVE DISCUSSED DIFFERENT NON-CONVENTIONAL THERAPEUTIC STRATEGIES, INCLUDING COMBINATION THERAPY AND NON-DRUG TREATMENT. THE RECENT STUDIES SUPPORTING THE MODERN APPROACHES FOR THE TREATMENT OF EPILEPSY HAVE BEEN DELIBERATED WITH PARTICULAR REFERENCE TO THE MTOR PATHWAY, BREAKDOWN OF THE BLOOD-BRAIN BARRIER, AND INFLAMMATORY PATHWAYS. 2021 12 619 28 BIOCHEMICAL ASPECTS AND THERAPEUTIC MECHANISMS OF CANNABIDIOL IN EPILEPSY. EPILEPSY IS A CHRONIC NEUROLOGICAL DISEASE CHARACTERIZED BY RECURRENT EPILEPTIC SEIZURES. STUDIES HAVE SHOWN THE COMPLEXITY OF EPILEPTOGENESIS AND ICTOGENESIS, IN WHICH IMMUNOLOGICAL PROCESSES AND EPIGENETIC AND STRUCTURAL CHANGES IN NEURONAL TISSUES HAVE BEEN IDENTIFIED AS TRIGGERING EPILEPSY. CANNABIDIOL (CBD) IS A MAJOR ACTIVE COMPONENT OF THE CANNABIS PLANT AND THE SOURCE OF CBD-ENRICHED PRODUCTS FOR THE TREATMENT OF EPILEPSY AND ASSOCIATED DISEASES. IN THIS REVIEW, WE PROVIDE AN UP-TO-DATE DISCUSSION ON CELLULAR AND MOLECULAR MECHANISMS TRIGGERED DURING EPILEPSY CRISES, AND THE PHYTOCHEMICAL CHARACTERISTICS OF CBD THAT MAKE IT AN ATTRACTIVE CANDIDATE FOR CONTROLLING RARE SYNDROMES, WITH EXCELLENT THERAPEUTIC PROPERTIES. WE ALSO DISCUSS POSSIBLE CBD ANTICONVULSANT MECHANISMS AND MOLECULAR TARGETS IN NEURODEGENERATIVE DISORDERS AND EPILEPSY. BASED ON THESE ARGUMENTS, WE CONCLUDE THAT CBD PRESENTS A BIOTECNOLOGICAL POTENTIAL IN THE ANTICONVULSANT PROCESS, INCLUDING DECREASING DEPENDENCE ON HEALTH CARE IN HOSPITALS, AND COULD MAKE THE PATIENT'S LIFE MORE STABLE, WITH REGARD TO NEUROLOGICAL CONDITIONS. 2022 13 1686 38 DRUGGING THE PAIN EPIGENOME. MORE THAN 20% OF ADULTS WORLDWIDE EXPERIENCE DIFFERENT TYPES OF CHRONIC PAIN, WHICH ARE FREQUENTLY ASSOCIATED WITH SEVERAL COMORBIDITIES AND A DECREASE IN QUALITY OF LIFE. SEVERAL APPROVED PAINKILLERS ARE AVAILABLE, BUT CURRENT ANALGESICS ARE OFTEN HAMPERED BY INSUFFICIENT EFFICACY AND/OR SEVERE ADVERSE EFFECTS. CONSEQUENTLY, NOVEL STRATEGIES FOR SAFE, HIGHLY EFFICACIOUS TREATMENTS ARE HIGHLY DESIRABLE, PARTICULARLY FOR CHRONIC PAIN. EPIGENETIC MECHANISMS SUCH AS DNA METHYLATION, HISTONE MODIFICATIONS AND MICRORNAS (MIRNAS) STRONGLY AFFECT THE REGULATION OF GENE EXPRESSION, POTENTIALLY FOR LONG PERIODS OVER YEARS OR EVEN GENERATIONS, AND HAVE BEEN ASSOCIATED WITH PATHOPHYSIOLOGICAL PAIN. SEVERAL STUDIES, MOSTLY IN ANIMALS, REVEALED THAT INHIBITORS OF DNA METHYLATION, ACTIVATORS AND INHIBITORS OF HISTONE MODIFICATION AND MODULATORS OF MIRNAS REVERSE A NUMBER OF PATHOLOGICAL CHANGES IN THE PAIN EPIGENOME, WHICH ARE ASSOCIATED WITH ALTERED EXPRESSION OF PAIN-RELEVANT GENES. THIS EPIGENETIC MODULATION MIGHT THEN REDUCE THE NOCICEPTIVE RESPONSE AND PROVIDE NOVEL THERAPEUTIC OPTIONS FOR ANALGESIC THERAPY OF CHRONIC PAIN STATES. HOWEVER, A NUMBER OF CHALLENGES, SUCH AS NONSPECIFIC EFFECTS AND POOR DELIVERY TO TARGET CELLS AND TISSUES, HINDER THE RAPID DEVELOPMENT OF SUCH ANALGESICS. IN THIS REVIEW, WE CRITICALLY SUMMARIZE DATA ON EPIGENETICS AND PAIN, FOCUSING ON CHALLENGES IN CLINICAL DEVELOPMENT AS WELL AS POSSIBLE NEW APPROACHES TO THE DRUG MODULATION OF THE PAIN EPIGENOME. 2017 14 5928 24 TARGETING EPIGENETIC MECHANISMS FOR PAIN RELIEF. EPIGENETIC CHANGES ARE CHEMICAL MODIFICATIONS TO CHROMATIN THAT MODULATE GENE ACTIVITY WITHOUT ALTERING THE DNA SEQUENCE. WHILE RESEARCH ON EPIGENETICS HAS GROWN EXPONENTIALLY OVER THE PAST FEW YEARS, VERY FEW STUDIES HAVE INVESTIGATED EPIGENETIC MECHANISMS IN RELATION TO PAIN STATES. HOWEVER, EPIGENETIC MECHANISMS ARE CRUCIAL TO MEMORY FORMATION THAT REQUIRES SIMILAR SYNAPTIC PLASTICITY TO PAIN PROCESSING, INDICATING THAT THEY MAY PLAY A KEY ROLE IN THE CONTROL OF PAIN STATES. THIS ARTICLE REVIEWS THE EARLY EVIDENCE SUGGESTING THAT EPIGENETIC MECHANISMS ARE ENGAGED AFTER INJURY AND IN CHRONIC PAIN STATES, AND THAT DRUGS USED CLINICALLY TO TARGET THE EPIGENETIC MACHINERY FOR THE TREATMENT OF CANCER MIGHT BE USEFUL FOR THE MANAGEMENT OF CHRONIC PAIN. 2012 15 5038 25 PHARMACOGENETICS OF CHRONIC PAIN AND ITS TREATMENT. THIS PAPER REVIEWS THE IMPACT OF GENETIC VARIABILITY OF DRUG METABOLIZING ENZYMES, TRANSPORTERS, RECEPTORS, AND PATHWAYS INVOLVED IN CHRONIC PAIN PERCEPTION ON THE EFFICACY AND SAFETY OF ANALGESICS AND OTHER DRUGS USED FOR CHRONIC PAIN TREATMENT. SEVERAL CANDIDATE GENES HAVE BEEN IDENTIFIED IN THE LITERATURE, WHILE THERE IS USUALLY ONLY LIMITED CLINICAL EVIDENCE SUBSTANTIATING FOR THE PENETRATION OF THE TESTING FOR THESE CANDIDATE BIOMARKERS INTO THE CLINICAL PRACTICE. FURTHER, THE PAIN-PERCEPTION REGULATION AND MODULATION ARE STILL NOT FULLY UNDERSTOOD, AND THUS MORE COMPLEX KNOWLEDGE OF GENETIC AND EPIGENETIC BACKGROUND FOR ANALGESIA WILL BE NEEDED PRIOR TO THE CLINICAL USE OF THE CANDIDATE GENETIC BIOMARKERS. 2013 16 2551 36 EPIGENETICS IN PAIN AND ANALGESIA: AN IMMINENT RESEARCH FIELD. HERITABLE PHENOTYPES RESULTING FROM ENVIRONMENT-CAUSED CHANGES IN A CHROMOSOME WITHOUT ALTERATIONS IN THE DNA SEQUENCE ARE INCREASINGLY RECOGNIZED AS A BASIS OF PERSONALIZED THERAPY. EPIGENETIC MECHANISMS INCLUDE COVALENT MODIFICATIONS OF THE DNA (METHYLATION) OR OF THE DNA-PACKAGING HISTONES (E.G., DEACETYLATION OR PHOSPHORYLATION). IN ADDITION, REGULATORY NON-CODING RNA MOLECULES (MICRO-RNAS) EXERT EPIGENETIC ACTIONS. THIS LEADS TO DISRUPTION OR OTHERWISE MODIFIED EXPRESSION OF GENES. ENVIRONMENTAL INFLUENCES SUCH AS NUTRITIONAL FACTORS, EXPOSURE TO CHEMICALS OR DRUGS, BUT ALSO SOCIAL FACTORS APPEAR TO EXERT EPIGENETIC ACTIONS. HISTONE MODIFICATIONS AND DNA METHYLATION ARE ASSOCIATED WITH THE SUBJECT'S AGE. EPIGENETIC MECHANISMS CAN SILENCE THE EXPRESSION OF PRO- OR ANTINOCICEPTIVE GENES. TO THE EPIGENETIC CONTROL OF NOCICEPTION ADDS ITS CONTROL OF THE PHARMACODYNAMICS OR PHARMACOKINETICS OF ANALGESICS BY EPIGENETIC CONTROL OF DRUG TARGETS AND ANALGESICS METABOLIZING ENZYMES. ALTHOUGH EPIGENETICS-BASED STRATEGIES FOR PAIN THERAPY ARE NOT YET AVAILABLE, EXPERIMENTS IN RODENTS SUGGEST THAT RNA INTERFERENCE MAY BECOME A NEW THERAPY APPROACH FOR NEUROPATHIC AND OTHER PAIN. ANOTHER EPIGENETIC APPROACH TO ANALGESIC TREATMENT EMPLOYS INHIBITORS OF HISTONE DEACETYLASE THAT ACT ON THE EPIGENOME BY INDIRECTLY REMODELING THE SPATIAL CONFORMATION OF THE CHROMATIN. FINALLY, EPIGENETIC TECHNIQUES SUCH AS RNA INTERFERENCE HAVE BEEN EMPLOYED IN PAIN RESEARCH TO PROOF THE CONTRIBUTION OF CERTAIN PROTEINS TO NOCICEPTION. THUS, THE NEW FIELD OF EPIGENETICS BECOMES INCREASINGLY USED IN RESEARCH AND MANAGEMENT OF PAIN AND WILL COMPLEMENT GENETICS. THIS ARTICLE INTRODUCES EPIGENETICS TO PAIN AND SUMMARIZES THE CURRENT AND FUTURE UTILITY. 2011 17 2586 33 EPIGENETICS OF PAIN MEDIATORS. PURPOSE OF REVIEW: THE FIELD OF EPIGENETICS CONTINUES ITS INFLUENTIAL RISE AS A MEANS TO BETTER UNDERSTAND AN ORGANISM'S UNIQUE DEVELOPMENTAL IDENTITY OVER A LIFESPAN. WHEREAS A GENOME IS CONSTANT AND UNCHANGING, AN EPIGENOME IS DYNAMIC AND ALTERABLE. EPIGENETIC CHANGES ARE IN RESPONSE TO INNUMERABLE INTERNAL AND EXTERNAL INFLUENCES INCLUDING ENVIRONMENTAL CHANGES SUCH AS DIET, EXERCISE, DISEASE, TOXINS, AND STRESS. EPIGENETICS IS OF PARTICULAR INTEREST IN THE MEDICAL RESEARCH COMMUNITY BOTH FOR THE POTENTIAL TO CAUSE DISEASE AND AS A TARGET FOR THERAPEUTIC INTERVENTIONS. THIS ARTICLE PROVIDES A SUCCINCT EXPLANATION OF THE POTENTIAL FOR EPIGENETICS TO INFLUENCE THE UNDERSTANDING OF PAIN AS WELL AS A REVIEW OF RELEVANT RESEARCH ON THE TOPIC. RECENT FINDINGS: STUDIES ON EPIGENETICS AND PAIN REMAIN LARGELY PRECLINICAL AND INVESTIGATE THE THEORETICAL ABILITY OF EPIGENETICS TO ALTER THE NOCICEPTIVE PATHWAYS BOTH IN THE PERIPHERY AND CENTRALLY. SIGNIFICANT EVIDENCE NOW EXISTS FOR THE ABILITY OF EPIGENETICS TO MODIFY BROADLY CATEGORIZED PAIN TYPES, INCLUDING INFLAMMATORY, NEUROPATHIC, VISCERAL, AND CANCER RELATED. SUMMARY: BOTH PATIENTS AND PROVIDERS RECOGNIZE THAT NOVEL MEDICATIONS FOR THE TREATMENT OF BOTH ACUTE AND CHRONIC PAIN CONDITIONS ARE SORELY NEEDED. THE UNDERSTANDING OF EPIGENETICS AND ITS INFLUENCE ON NOCICEPTION REMAINS IN RELATIVE INFANCY BUT EARLY EVIDENCE IS STRONG FOR POTENTIAL THERAPEUTIC BENEFITS TO TREAT THESE CONDITIONS. 2018 18 2254 26 EPIGENETIC MODULATION: RESEARCH PROGRESS ON HISTONE ACETYLATION LEVELS IN MAJOR DEPRESSIVE DISORDERS. DEPRESSION IS A SERIOUS MENTAL ILLNESS AND A PREVALENT CONDITION WITH MULTIPLE AETIOLOGIES. THE IMPACT OF THE CURRENT THERAPEUTIC STRATEGIES IS LIMITED AND THE PATHOGENESIS OF THE ILLNESS IS NOT WELL UNDERSTOOD. ACCORDING TO PREVIOUS STUDIES, DEPRESSION ONSET IS INFLUENCED BY A VARIETY OF ENVIRONMENTAL AND GENETIC FACTORS, INCLUDING CHRONIC STRESS, ABERRANT CHANGES IN GENE EXPRESSION, AND HEREDITARY PREDISPOSITION. TRANSCRIPTIONAL REGULATION IN EUKARYOTES IS CLOSELY RELATED TO CHROMOSOME PACKING AND IS CONTROLLED BY HISTONE POST-TRANSLATIONAL MODIFICATIONS. THE DEVELOPMENT OF NEW ANTIDEPRESSANTS MAY PROCEED ALONG A NEW PATH WITH MEDICATIONS THAT TARGET EPIGENETICS. HISTONE DEACETYLASE INHIBITORS (HDACIS) ARE A CLASS OF COMPOUNDS THAT INTERFERE WITH THE FUNCTION OF HISTONE DEACETYLASES (HDACS). THIS REVIEW EXPLORES THE RELATIONSHIP BETWEEN HDACS AND DEPRESSION AND FOCUSES ON THE CURRENT KNOWLEDGE ON THEIR REGULATORY MECHANISM IN DEPRESSION AND THE POTENTIAL THERAPEUTIC USE OF HDACIS WITH ANTIDEPRESSANT EFFICACY IN PRECLINICAL RESEARCH. FUTURE RESEARCH ON INHIBITORS IS ALSO PROPOSED AND DISCUSSED. 2023 19 6124 26 THE EPIGENETIC MECHANISMS INVOLVED IN CHRONIC PAIN IN RODENTS: A MINI- REVIEW. CHRONIC PAIN IS A COMMON DISTRESSING NEUROLOGICAL DISORDER AND ABOUT 30% OF THE GLOBAL POPULATION SUFFERS FROM IT. IN ADDITION TO BEING HIGHLY PREVALENT, CHRONIC PAIN CAUSES A HEAVY ECONOMIC AND SOCIAL BURDEN. ALTHOUGH SUBSTANTIAL PROGRESS HAS BEEN ACHIEVED TO DISSECT THE UNDERLYING MECHANISM OF CHRONIC PAIN IN THE PAST FEW DECADES, THE INCIDENCE AND TREATMENT OF THIS NEUROLOGICAL ILLNESS IS YET NOT PROPERLY MANAGED IN CLINICAL PRACTICE. WHILE NERVE INJURY-, CHEMOTHERAPY- OR INFLAMMATION-INDUCED FUNCTIONAL REGULATION OF GENE EXPRESSION IN THE DORSAL ROOT GANGLION AND SPINAL CORD ARE EXTENSIVELY REPORTED TO BE INVOLVED IN THE PATHOGENIC PROCESS OF CHRONIC PAIN, THE SPECIFIC MECHANISM OF THESE ALTERED TRANSCRIPTIONAL PROFILE STILL REMAINS UNCLEAR. RECENT STUDIES HAVE SHOWN THAT EPIGENETIC MECHANISMS, INCLUDING DNA/RNA METHYLATION, HISTONE MODIFICATION AND CIRCULAR RNAS REGULATION, ARE INVOLVED IN THE OCCURRENCE AND DEVELOPMENT OF CHRONIC PAIN. IN THIS REVIEW, WE PROVIDE A DESCRIPTION OF RESEARCH ON THE ROLE OF EPIGENETIC MECHANISM IN CHRONIC PAIN, SUMMARIZE THE LATEST CLINICAL AND PRECLINICAL ADVANCE IN THIS FIELD, AND PROPOSE THE POTENTIAL DIRECTIONS FOR FURTHER RESEARCH TO ELUCIDATE THE MOLECULAR MECHANISM UNDERLYING THE PATHOGENESIS OF CHRONIC PAIN. 2022 20 2611 21 EPIGENETICS: A PROMISING PARADIGM FOR BETTER UNDERSTANDING AND MANAGING PAIN. EPIGENETIC REGULATION OF GENE EXPRESSION IS A RAPIDLY GROWING AREA OF RESEARCH. CONSIDERING THE LONGEVITY AND PLASTICITY OF NEURONS, THE STUDIES ON EPIGENETIC PATHWAYS IN THE NERVOUS SYSTEM SHOULD BE OF SPECIAL INTEREST FOR BOTH EPIGENETICISTS AND NEUROSCIENTISTS. ACTIVATION OR INACTIVATION OF DIFFERENT EPIGENETIC PATHWAYS BECOMES MORE PRONOUNCED WHEN THE CELLS EXPERIENCE RAPID CHANGES IN THEIR ENVIRONMENT, AND SUCH CHANGES CAN BE EASILY CAUSED BY INJURY AND INFLAMMATION, RESULTING IN PAIN PERCEPTION OR DISTORTION OF PAIN PERCEPTION (EG, HYPERALGESIA). THEREFORE, IN THIS REGARD, THE FIELD OF PAIN IS AT AN ADVANTAGE TO STUDY THE EPIGENETIC PATHWAYS. MORE IMPORTANTLY, UNDERSTANDING PAIN FROM AN EPIGENETICS POINT OF VIEW WOULD PROVIDE A NEW PARADIGM FOR DEVELOPING DRUGS OR STRATEGIES FOR PAIN MANAGEMENT. IN THIS REVIEW, WE INTRODUCE BASIC CONCEPTS OF EPIGENETICS, INCLUDING CHROMATIN DYNAMICS, HISTONE MODIFICATIONS, DNA METHYLATION, AND RNA-INDUCED GENE SILENCING. IN ADDITION, WE PROVIDE EVIDENCE FROM PUBLISHED STUDIES SUGGESTING WIDE IMPLICATION OF DIFFERENT EPIGENETIC PATHWAYS WITHIN PAIN PATHWAYS. PERSPECTIVE: THIS ARTICLE PROVIDES A BRIEF OVERVIEW OF EPIGENETIC PATHWAYS FOR GENE REGULATION AND HIGHLIGHTS THEIR INVOLVEMENT IN PAIN. OUR GOAL IS TO EXPOSE THE READERS TO THESE CONCEPTS SO THAT PAIN-RELATED PHENOTYPES CAN BE INVESTIGATED FROM THE EPIGENETIC POINT OF VIEW. 2013