1 5662 115 SEXUAL DIMORPHISM IN GLUCOCORTICOID STRESS RESPONSE. CHRONIC STRESS IS ENCOUNTERED IN OUR EVERYDAY LIFE AND IS THOUGHT TO CONTRIBUTE TO A NUMBER OF DISEASES. MANY OF THESE STRESS-RELATED DISORDERS DISPLAY A SEX BIAS. BECAUSE GLUCOCORTICOID HORMONES ARE THE MAIN BIOLOGICAL MEDIATOR OF CHRONIC STRESS, RESEARCHERS HAVE BEEN INTERESTED IN UNDERSTANDING THE SEXUAL DIMORPHISM IN GLUCOCORTICOID STRESS RESPONSE TO BETTER EXPLAIN THE SEX BIAS IN STRESS-RELATED DISEASES. ALTHOUGH NOT YET DEMONSTRATED FOR GLUCOCORTICOID REGULATION, SEX CHROMOSOMES DO INFLUENCE SEX-SPECIFIC BIOLOGY AS SOON AS CONCEPTION. THEN A TRANSIENT RISE IN TESTOSTERONE START TO SHAPE THE MALE BRAIN DURING THE PRENATAL PERIOD DIFFERENTLY TO THE FEMALE BRAIN. THESE ORGANIZATIONAL EFFECTS ARE COMPLETED JUST BEFORE PUBERTY. THE CEREBRAL REGIONS IMPLICATED IN GLUCOCORTICOID REGULATION AT REST AND AFTER STRESS ARE THEREBY IMPACTED IN A SEX-SPECIFIC MANNER. AFTER PUBERTY, THE HIGH LEVELS OF ALL GONADAL HORMONES WILL INTERACT WITH GLUCOCORTICOID HORMONES IN SPECIFIC CROSSTALK THROUGH THEIR RESPECTIVE NUCLEAR RECEPTORS. IN ADDITION, STRESS OCCURRING EARLY IN LIFE, IN PARTICULAR DURING THE PRENATAL PERIOD AND IN ADOLESCENCE WILL PRIME IN THE LONG-TERM GLUCOCORTICOID STRESS RESPONSE THROUGH EPIGENETIC MECHANISMS, AGAIN IN A SEX-SPECIFIC MANNER. ALTOGETHER, VARIOUS MOLECULAR MECHANISMS EXPLAIN SEX-SPECIFIC GLUCOCORTICOID STRESS RESPONSES THAT DO NOT EXCLUDE IMPORTANT GENDER EFFECTS IN HUMANS. 2021 2 2159 28 EPIGENETIC MECHANISMS IMPACTED BY CHRONIC STRESS ACROSS THE RODENT LIFESPAN. EXPOSURES TO STRESS AT ALL STAGES OF DEVELOPMENT CAN LEAD TO LONG-TERM BEHAVIOURAL EFFECTS, IN PART THROUGH CHANGES IN THE EPIGENOME. THIS REVIEW DESCRIBES RODENT RESEARCH SUGGESTING THAT STRESS IN PRENATAL, POSTNATAL, ADOLESCENT AND ADULT STAGES LEADS TO LONG-TERM CHANGES IN EPIGENETIC REGULATION IN THE BRAIN WHICH HAVE CAUSAL IMPACTS ON RODENT BEHAVIOUR. WE FOCUS ON STRESS-INDUCED EPIGENETIC CHANGES THAT HAVE BEEN LINKED TO BEHAVIOURAL DEFICITS INCLUDING POOR LEARNING AND MEMORY, AND INCREASED ANXIETY-LIKE AND DEPRESSIVE-LIKE BEHAVIOURS. INTERESTINGLY, ASPECTS OF THESE STRESS-INDUCED BEHAVIOURAL CHANGES CAN BE TRANSMITTED TO OFFSPRING ACROSS SEVERAL GENERATIONS, A PHENOMENON THAT HAS BEEN PROPOSED TO RESULT VIA EPIGENETIC MECHANISMS IN THE GERMLINE. HERE, WE ALSO DISCUSS EVIDENCE FOR THE DIFFERENTIAL IMPACT OF STRESS ON THE EPIGENOME IN MALES AND FEMALES, CONSCIOUS OF THE FACT THAT THE MAJORITY OF PUBLISHED STUDIES HAVE ONLY INVESTIGATED MALES. THIS HAS LED TO A LIMITED PICTURE OF THE EPIGENETIC IMPACT OF STRESS, HIGHLIGHTING THE NEED FOR FUTURE STUDIES TO INVESTIGATE FEMALES AS WELL AS MALES. 2022 3 3001 35 GENETIC, EPIGENETIC AND ENVIRONMENTAL IMPACT ON SEX DIFFERENCES IN SOCIAL BEHAVIOR. THE FIELD OF BEHAVIORAL NEUROENDOCRINOLOGY HAS GENERATED THOUSANDS OF STUDIES THAT INDICATE DIFFERENCES IN BRAIN STRUCTURE AND REACTIVITY TO GONADAL STEROIDS THAT PRODUCE SEX-SPECIFIC PATTERNS OF SOCIAL BEHAVIOR. HOWEVER, RAPIDLY EMERGING EVIDENCE SHOWS THAT GENETIC POLYMORPHISMS AND RESULTING DIFFERENCES IN THE EXPRESSION OF NEUROACTIVE PEPTIDES AND RECEPTORS AS WELL AS EARLY-LIFE EXPERIENCE AND EPIGENETIC CHANGES ARE IMPORTANT MODIFIERS OF SOCIAL BEHAVIOR. FURTHERMORE, DUE TO ITS INHERENT COMPLEXITY, THE NEUROCHEMICAL MECHANISMS UNDERLYING SEX DIFFERENCES IN SOCIAL BEHAVIOR ARE USUALLY STUDIED IN A TIGHTLY REGULATED LABORATORY SETTING RATHER THAN IN COMPLEX ENVIRONMENTS. IMPORTANTLY, SPECIFIC HORMONES MAY ELICIT A RANGE OF DIFFERENT BEHAVIORS DEPENDING ON THE CUES PRESENT IN THESE ENVIRONMENTS. FOR EXAMPLE, INDIVIDUALS EXPOSED TO A PSYCHOSOCIAL STRESSOR MAY RESPOND DIFFERENTLY TO THE EFFECTS OF A GONADAL STEROID THAN THOSE NOT EXPOSED TO CHRONIC STRESS. THE OBJECTIVE OF THIS REVIEW IS NOT TO RE-EXAMINE THE ACTIVATIONAL EFFECTS OF HORMONES ON SEX DIFFERENCES IN SOCIAL BEHAVIOR BUT RATHER TO CONSIDER HOW GENETIC AND ENVIRONMENTAL FACTORS MODIFY THE EFFECTS OF HORMONES ON BEHAVIOR. WE WILL FOCUS ON ESTROGEN AND ITS RECEPTORS BUT CONSIDERATION IS ALSO GIVEN TO THE ROLE OF ANDROGENS. FURTHERMORE, WE HAVE LIMITED OUR DISCUSSIONS TO THE IMPORTANCE OF OXYTOCIN AND VASOPRESSIN AS TARGETS OF GONADAL STEROIDS AND HOW THESE EFFECTS ARE MODIFIED BY GENETIC AND EXPERIENTIAL SITUATIONS. TAKEN TOGETHER, THE DATA CLEARLY UNDERSCORE THE NEED TO EXPAND RESEARCH INITIATIVES TO CONSIDER GENE-ENVIRONMENT INTERACTIONS FOR BETTER UNDERSTANDING OF THE NEUROBIOLOGY OF SEX DIFFERENCES IN SOCIAL BEHAVIOR. 2009 4 291 29 AGING AND STRESS: PAST HYPOTHESES, PRESENT APPROACHES AND PERSPECTIVES. BRAIN AGING HAS BEEN SUGGESTED TO BE CONDITIONED BY AN EXCESSIVE GLUCOCORTIOID SECRETION LEADING TO DAMAGES ON BRAIN AREAS INVOLVED NOT ONLY IN COGNITIVE AND EMOTIONAL PROCESSES BUT ALSO IN THE CONTROL OF THE ACTIVITY OF THE HYPOTHALAMIC-PITUITARY ADRENAL AXIS. THIS REVIEW DESCRIBES SOME OF THE HYPOTHESIS THAT TRY TO EXPLAIN THE RELATION BETWEEN THE DYSREGULATION OF THE STRESS RESPONSE AND BRAIN AGING, FOCUSING ON CORTICOSTERONE BUT ALSO ON NEUROTRANSMISSION IN THE HIPPOCAMPUS, THE PREFRONTAL CORTEX AND THE AMYGDALA. MOREOVER, DIFFERENT MOLECULAR FACTORS CAN ACCOUNT FOR AN ENHANCED VULNERABILITY OF THE AGED BRAIN TO STRESS EXPOSURE, SPECIALLY FOR RESILIENCE. AMONG THEM, GOOD CANDIDATES COULD BE THOSE MECHANISMS DETERMINING THE LEVELS OF CORTICOSTERONE IN THE BRAIN, SEVERAL MOLECULES DOWNSTREAM GLUCOCORTICOID RECEPTOR ACTIVATION (IE: HEAT SHOCK PROTEINS, BAG-1) OR EVEN THE EPIGENETIC PROGRAMMING OF THE HPA AXIS IN EARLY STAGES. IN CONCLUSION, GENETIC AND ENVIRONMENTAL FACTORS (EARLY LIFE STRESS, CHRONIC STRESS DURING ADULTHOOD) CAN PRODUCE AN ENHANCED VULNERABILITY AND A REDUCED RESILIENCE OF THE BRAIN TO SUBSEQUENT STRESS EXPOSURES OR TO METABOLIC CHALLENGES LEADING, IN TURN, TO AN UNSUCCESSFUL AGING OF THE BRAIN. HOWEVER, RESULTS OBTAINED WITH THE USE OF THE ENVIRONMENTAL ENRICHMENT MODEL IN ANIMALS, ADDED TO SEVERAL RESULTS IN HUMANS ALSO DESCRIBED IN THIS REVIEW SUGGEST THAT POSITIVE ENVIRONMENTAL FACTORS (COGNITIVE-DEMANDING TASKS OR PHYSICAL EXERCISE) CAN HELP TO MAINTAIN NEURONAL PLASTICITY DURING AGING AND TO PROTECT THE BRAIN AGAINST THE DAMAGING EFFECTS OF STRESS EXPOSURE. 2011 5 6729 27 VULNERABILITY TO STROKE: IMPLICATIONS OF PERINATAL PROGRAMMING OF THE HYPOTHALAMIC-PITUITARY-ADRENAL AXIS. CHRONIC STRESS IS CAPABLE OF EXACERBATING EACH MAJOR, MODIFIABLE, ENDOGENOUS RISK FACTOR FOR CEREBROVASCULAR AND CARDIOVASCULAR DISEASE. INDEED, EXPOSURE TO STRESS CAN INCREASE BOTH THE INCIDENCE AND SEVERITY OF STROKE, PRESUMABLY THROUGH ACTIVATION OF THE HYPOTHALAMIC-PITUITARY-ADRENAL (HPA) AXIS. NOW THAT CHARACTERIZATION OF THE MECHANISMS UNDERLYING EPIGENETIC PROGRAMMING OF THE HPA AXIS IS WELL UNDERWAY, THERE HAS BEEN RENEWED INTEREST IN EXAMINING THE ROLE OF EARLY ENVIRONMENT ON THE EVOLUTION OF HEALTH CONDITIONS ACROSS THE ENTIRE LIFESPAN. INDEED, NEONATAL MANIPULATIONS IN RODENTS THAT REDUCE STRESS RESPONSIVITY, AND SUBSEQUENT LIFE-TIME EXPOSURE TO GLUCOCORTICOIDS, ARE ASSOCIATED WITH A REDUCTION IN THE DEVELOPMENT OF NEUROENDOCRINE, NEUROANATOMICAL, AND COGNITIVE DYSFUNCTIONS THAT TYPICALLY PROGRESS WITH AGE. ALTHOUGH IMPROVED DAY TO DAY REGULATION OF THE HPA AXIS ALSO MAY BE ACCOMPANIED BY A DECREASE IN STROKE RISK, EVIDENCE FROM RODENT STUDIES SUGGEST THAT AN ASSOCIATED COST COULD BE INCREASED SUSCEPTIBILITY TO INFLAMMATION AND NEURONAL DEATH IN THE EVENT THAT A STROKE DOES OCCUR AND THE INDIVIDUAL IS EXPOSED TO PERSISTENTLY ELEVATED CORTICOSTEROIDS. GIVEN ITS IMPORTANCE IN REGULATION OF HEALTH AND DISEASE STATES, ANY LONG-TERM MODULATION OF THE HPA AXIS IS LIKELY TO BE ASSOCIATED WITH BOTH BENEFITS AND POTENTIAL RISKS. THE GOALS OF THIS REVIEW ARTICLE ARE TO EXAMINE (1) THE CLINICAL AND EXPERIMENTAL DATA SUGGESTING THAT NEONATAL EXPERIENCES CAN SHAPE HPA AXIS REGULATION, (2) THE INFLUENCE OF STRESS AND THE HPA AXIS ON STROKE INCIDENCE AND SEVERITY, AND (3) THE POTENTIAL FOR NEONATAL PROGRAMMING OF THE HPA AXIS TO IMPACT ADULT CEREBROVASCULAR HEALTH. 2009 6 6228 24 THE LINKS BETWEEN STRESS AND DEPRESSION: PSYCHONEUROENDOCRINOLOGICAL, GENETIC, AND ENVIRONMENTAL INTERACTIONS. THE ROLE OF STRESS IN THE ORIGIN AND DEVELOPMENT OF DEPRESSION MAY BE CONCEIVED AS THE RESULT OF MULTIPLE CONVERGING FACTORS, INCLUDING THE CHRONIC EFFECT OF ENVIRONMENTAL STRESSORS AND THE LONG-LASTING EFFECTS OF STRESSFUL EXPERIENCES DURING CHILDHOOD, ALL OF WHICH MAY INDUCE PERSISTENT HYPERACTIVITY OF THE HYPOTHALAMIC-PITUITARY-ADRENAL AXIS. THESE CHANGES, INCLUDING INCREASED AVAILABILITY OF CORTICOTROPIN-RELEASING FACTOR AND CORTISOL, ARE ALSO ASSOCIATED WITH HYPERACTIVITY OF THE AMYGDALA, HYPOACTIVITY OF THE HIPPOCAMPUS, AND DECREASED SEROTONERGIC NEUROTRANSMISSION, WHICH TOGETHER RESULT IN INCREASED VULNERABILITY TO STRESS. THE ROLE OF OTHER MONOAMINERGIC NEUROTRANSMITTERS, GENETIC POLYMORPHISMS, EPIGENETIC MECHANISMS, INFLAMMATORY PROCESSES, AND ALTERED COGNITIVE PROCESSING HAS ALSO BEEN CONSIDERED IN THE DEVELOPMENT OF A COMPREHENSIVE MODEL OF THE INTERACTIONS BETWEEN DIFFERENT FACTORS OF VULNERABILITY. FURTHER UNDERSTANDING OF THE UNDERLYING MECHANISMS THAT LINK THESE FACTORS MAY CONTRIBUTE SIGNIFICANTLY TO THE DEVELOPMENT OF MORE EFFECTIVE TREATMENTS AND PREVENTIVE STRATEGIES IN THE INTERFACE BETWEEN STRESS AND MOOD DISORDERS. 2016 7 3405 33 HOW STRESS GETS UNDER THE SKIN: EARLY LIFE ADVERSITY AND GLUCOCORTICOID RECEPTOR EPIGENETIC REGULATION. EARLY LIFE ADVERSITY IS ASSOCIATED WITH BOTH PERSISTENT DISRUPTIONS IN THE HYPOTHALAMIC-PITUITARY-ADRENAL (HPA) AXIS AND PSYCHIATRIC SYMPTOMS. GLUCOCORTICOID RECEPTORS (GRS), WHICH ARE ENCODED BY THE NR3C1 GENE, BIND TO CORTISOL AND OTHER GLUCOCORTICOIDS TO CREATE A NEGATIVE FEEDBACK LOOP WITHIN THE HPA AXIS TO REGULATE THE BODY'S NEUROENDOCRINE RESPONSE TO STRESS. EXCESS METHYLATION OF A PROMOTER SEQUENCE WITHIN NR3C1 THAT ATTENUATES GR EXPRESSION, HOWEVER, HAS BEEN ASSOCIATED WITH BOTH EARLY LIFE ADVERSITY AND PSYCHOPATHOLOGY. AS CRITICAL REGULATORS WITHIN THE HPA AXIS, GRS AND THEIR EPIGENETIC REGULATION MAY MEDIATE THE LINK BETWEEN EARLY LIFE ADVERSITY AND THE ONSET OF PSYCHOPATHOLOGY. THE PRESENT REVIEW DISCUSSES THIS WORK AS ONE MECHANISM BY WHICH STRESS MAY GET UNDER THE SKIN TO DISRUPT HPA FUNCTIONING AT AN EPIGENETIC LEVEL AND CREATE LONG-LASTING VULNERABILITIES IN THE STRESS REGULATORY SYSTEM THAT SUBSEQUENTLY PREDISPOSE INDIVIDUALS TO PSYCHOPATHOLOGY. SPANNING PRENATAL INFLUENCES TO CRITICAL PERIODS OF EARLY LIFE AND ADOLESCENCE, WE DETAIL THE IMPACT THAT EARLY ADVERSITY HAS ON GR EXPRESSION, PHYSIOLOGICAL RESPONSES TO STRESS, AND THEIR IMPLICATIONS FOR LONG-TERM STRESS MANAGEMENT. WE NEXT PROPOSE A DUAL TRANSMISSION HYPOTHESIS REGARDING BOTH GENOMIC AND NON-GENOMIC MECHANISMS BY WHICH CHRONIC AND ACUTE STRESS PROPAGATE THROUGH NUMEROUS GENERATIONS. LASTLY, WE OUTLINE SEVERAL DIRECTIONS FOR FUTURE RESEARCH, INCLUDING POTENTIAL REVERSIBILITY OF METHYLATION PATTERNS AND ITS FUNCTIONAL IMPLICATIONS, VARIATION IN BEHAVIOR DETERMINED SOLELY BY NR3C1, AND CONSENSUS ON WHICH SPECIFIC PROMOTER REGIONS SHOULD BE STUDIED. 2018 8 3151 31 GLUCOCORTICOIDS, EPIGENETIC CONTROL AND STRESS RESILIENCE. GLUCOCORTICOID HORMONES PLAY A PIVOTAL ROLE IN THE RESPONSE TO STRESSFUL CHALLENGES. THE SURGE IN GLUCOCORTICOID HORMONE SECRETION AFTER STRESS NEEDS TO BE TIGHTLY CONTROLLED WITH CHARACTERISTICS LIKE PEAK HEIGHT, CURVATURE AND DURATION DEPENDING ON THE NATURE AND SEVERITY OF THE CHALLENGE. THIS IS IMPORTANT AS CHRONIC HYPER- OR HYPO-RESPONSES ARE DETRIMENTAL TO HEALTH DUE TO INCREASING THE RISK FOR DEVELOPING A STRESS-RELATED MENTAL DISORDER. PROPER GLUCOCORTICOID RESPONSES TO STRESS ARE CRITICAL FOR ADAPTATION. THEREFORE, THE TIGHT CONTROL OF BASELINE AND STRESS-EVOKED GLUCOCORTICOID SECRETION ARE IMPORTANT CONSTITUENTS OF AN ORGANISM'S RESILIENCE. HERE, WE ADDRESS A NUMBER OF MECHANISMS THAT ILLUSTRATE THE MULTITUDE AND COMPLEXITY OF MEASURES SAFEGUARDING THE CONTROL OF GLUCOCORTICOID FUNCTION. THESE MECHANISMS INCLUDE THE CONTROL OF MINERALOCORTICOID (MR) AND GLUCOCORTICOID RECEPTOR (GR) OCCUPANCY AND CONCENTRATION, THE DYNAMIC CONTROL OF FREE GLUCOCORTICOID HORMONE AVAILABILITY BY CORTICOSTEROID-BINDING GLOBULIN (CBG), AND THE CONTROL EXERTED BY GLUCOCORTICOIDS AT THE SIGNALING, EPIGENETIC AND GENOMIC LEVEL ON GENE TRANSCRIPTIONAL RESPONSES TO STRESS. WE REVIEW THE BENEFICIAL EFFECTS OF REGULAR EXERCISE ON HPA AXIS AND SLEEP PHYSIOLOGY, AND COGNITIVE AND ANXIETY-RELATED BEHAVIOR. FURTHERMORE, WE DESCRIBE THAT, POSSIBLY THROUGH CHANGES IN THE GABAERGIC SYSTEM, EXERCISE REDUCES THE IMPACT OF STRESS ON A SIGNALING PATHWAY SPECIFICALLY IN THE DENTATE GYRUS THAT IS STRONGLY IMPLICATED IN THE BEHAVIORAL RESPONSE TO THAT STRESSOR. THESE OBSERVATIONS UNDERLINE THE IMPACT OF LIFE STYLE ON STRESS RESILIENCE. FINALLY, WE ADDRESS HOW SINGLE NUCLEOTIDE POLYMORPHISMS (SNPS) AFFECTING GLUCOCORTICOID ACTION CAN COMPROMISE STRESS RESILIENCE, WHICH BECOMES MOST APPARENT UNDER CONDITIONS OF CHILDHOOD ABUSE. 2015 9 5164 28 PRECLINICAL AND CLINICAL EVIDENCE OF DNA METHYLATION CHANGES IN RESPONSE TO TRAUMA AND CHRONIC STRESS. EXPOSURE TO CHRONIC STRESS, EITHER REPEATED SEVERE ACUTE OR MODERATE SUSTAINED STRESS, IS ONE OF THE STRONGEST RISK FACTORS FOR THE DEVELOPMENT OF PSYCHOPATHOLOGIES SUCH AS POST-TRAUMATIC STRESS DISORDER AND DEPRESSION. CHRONIC STRESS IS LINKED WITH SEVERAL LASTING BIOLOGICAL CONSEQUENCES, PARTICULARLY TO THE STRESS ENDOCRINE SYSTEM BUT ALSO AFFECTING INTERMEDIATE PHENOTYPES SUCH AS BRAIN STRUCTURE AND FUNCTION, IMMUNE FUNCTION, AND BEHAVIOR. ALTHOUGH GENETIC PREDISPOSITION CONFERS A PROPORTION OF THE RISK, THE MOST RELEVANT MOLECULAR MECHANISMS DETERMINING THOSE SUSCEPTIBLE AND RESILIENT TO THE EFFECTS OF STRESS AND TRAUMA MAY BE EPIGENETIC. EPIGENETICS REFERS TO THE MECHANISMS THAT REGULATE GENOMIC INFORMATION BY DYNAMICALLY CHANGING THE PATTERNS OF TRANSCRIPTION AND TRANSLATION OF GENES. MOUNTING EVIDENCE FROM PRECLINICAL RODENT AND CLINICAL POPULATION STUDIES STRONGLY SUPPORT THAT EPIGENETIC MODIFICATIONS CAN OCCUR IN RESPONSE TO TRAUMATIC AND CHRONIC STRESS. HERE, WE DISCUSS THIS LITERATURE EXAMINING STRESS-INDUCED EPIGENETIC CHANGES IN PRECLINICAL MODELS AND CLINICAL COHORTS OF STRESS AND TRAUMA OCCURRING EARLY IN LIFE OR IN ADULTHOOD. WE HIGHLIGHT THAT A COMPLEX RELATIONSHIP BETWEEN THE TIMING OF ENVIRONMENTAL STRESSORS AND GENETIC PREDISPOSITIONS LIKELY MEDIATE THE RESPONSE TO CHRONIC STRESS OVER TIME, AND THAT A BETTER UNDERSTANDING OF EPIGENETIC CHANGES IS NEEDED BY FURTHER INVESTIGATIONS IN LONGITUDINAL AND POSTMORTEM BRAIN CLINICAL COHORTS. 2017 10 2269 34 EPIGENETIC PROGRAMMING OF THE NEUROENDOCRINE STRESS RESPONSE BY ADULT LIFE STRESS. THE HYPOTHALAMIC-PITUITARY-ADRENAL (HPA) AXIS IS CRITICALLY INVOLVED IN THE NEUROENDOCRINE REGULATION OF STRESS ADAPTATION, AND THE RESTORATION OF HOMEOSTASIS FOLLOWING STRESS EXPOSURE. DYSREGULATION OF THIS AXIS IS ASSOCIATED WITH STRESS-RELATED PATHOLOGIES LIKE MAJOR DEPRESSIVE DISORDER, POST-TRAUMATIC STRESS DISORDER, PANIC DISORDER AND CHRONIC ANXIETY. IT HAS LONG BEEN UNDERSTOOD THAT STRESS DURING EARLY LIFE CAN HAVE A SIGNIFICANT LASTING INFLUENCE ON THE DEVELOPMENT OF THE NEUROENDOCRINE SYSTEM AND ITS NEURAL REGULATORS, PARTIALLY BY MODIFYING EPIGENETIC REGULATION OF GENE EXPRESSION, WITH IMPLICATIONS FOR HEALTH AND WELL-BEING IN LATER LIFE. EVIDENCE IS ACCUMULATING THAT EPIGENETIC PLASTICITY ALSO EXTENDS TO ADULTHOOD, PROPOSING IT AS A MECHANISM BY WHICH PSYCHOLOGICAL TRAUMA LATER IN LIFE CAN LONG-LASTINGLY AFFECT HPA AXIS FUNCTION, BRAIN PLASTICITY, NEURONAL FUNCTION AND BEHAVIOURAL ADAPTATION TO NEUROPSYCHOLOGICAL STRESS. FURTHER CORROBORATING THIS CLAIM IS THE PHENOMENON THAT THESE EPIGENETIC CHANGES CORRELATE WITH THE BEHAVIOURAL CONSEQUENCES OF TRAUMA EXPOSURE. THEREBY, EPIGENETIC MODIFICATIONS PROVIDE A PUTATIVE MOLECULAR MECHANISM BY WHICH THE BEHAVIOURAL PHENOTYPE AND TRANSCRIPTIONAL/TRANSLATIONAL POTENTIAL OF GENES INVOLVED IN HPA AXIS REGULATION CAN CHANGE DRASTICALLY IN RESPONSE TO ENVIRONMENTAL CHALLENGES, AND APPEAR AN IMPORTANT TARGET FOR TREATMENT OF STRESS-RELATED DISORDERS. HOWEVER, IMPROVED INSIGHT IS REQUIRED TO INCREASE THEIR THERAPEUTIC (DRUG) POTENTIAL. HERE, WE PROVIDE AN OVERVIEW OF THE GROWING BODY OF LITERATURE DESCRIBING THE EPIGENETIC MODULATION OF THE (PRIMARILY NEUROENDOCRINE) STRESS RESPONSE AS A CONSEQUENCE OF ADULT LIFE STRESS AND INTERPRET THE IMPLICATIONS FOR, AND THE CHALLENGES INVOLVED IN APPLYING THIS KNOWLEDGE TO, THE IDENTIFICATION AND TREATMENT OF STRESS-RELATED PSYCHIATRIC DISORDERS. 2017 11 1981 27 EPIGENETIC ALTERATIONS IN DNA AND HISTONE MODIFICATIONS CAUSED BY DEPRESSION AND ANTIDEPRESSANT DRUGS: LESSONS FROM THE RODENT MODELS. EPIGENETIC MODIFICATIONS REGULATE CHROMATIN FOLDING AND FUNCTION. EPIGENETIC MECHANISMS REGULATE TRANSCRIPTION MEDIATING EFFECTS OF VARIOUS STIMULI ON GENE EXPRESSION. THESE MECHANISMS ARE INVOLVED IN TRANSCRIPTIONAL CONTROL IN VARIOUS PHYSIOLOGICAL AND PATHOLOGICAL CONDITIONS INCLUDING NEUROPSYCHIATRIC DISORDERS AND BEHAVIORAL ABNORMALITIES SUCH AS DEPRESSION. IN RODENTS, EXPOSURE TO CHRONIC SOCIAL STRESS WAS SHOWN TO INDUCE BEHAVIORAL IMPAIRMENTS AND MEMORY/LEARNING DEFICITS THAT RESEMBLE DEPRESSIVE-LIKE PHENOTYPE IN HUMANS. THE RODENT MODELS OF CHRONIC STRESS WERE WIDELY USED TO STUDY MOLECULAR MECHANISMS OF DEPRESSION. IN THESE MODELS, EARLY EXPOSURE TO CHRONIC STRESS SUCH AS PRENATAL OR POSTNATAL STRESS INDUCES LONG-TERM HYPERACTIVE STRESS RESPONSES, BEHAVIORAL ABNORMALITIES, AND FUNCTIONAL IMPAIRMENTS IN BRAIN FUNCTION THAT PERSIST IN ADULTHOOD. FURTHERMORE, THESE ALTERATIONS CAN BE TRANSMITTED TO OFFSPRING OF CHRONICALLY STRESSED ANIMALS ACROSS SEVERAL GENERATIONS. MOLECULAR STUDIES IN ANIMAL MODELS SHOWED THAT CHRONIC STRESS INDUCES STABLE EPIGENETIC CHANGES IN SPECIFIC BRAIN REGIONS, PRIMARILY IN THE LIMBIC SYSTEM. THESE CHANGES LEAD TO LONG-LASTING ABNORMALITIES IN BEHAVIOR THAT PERSIST IN ADULTHOOD AND CAN BE TRANSMITTED TO OFFSPRING. TREATMENT WITH EPIGENETICALLY ACTIVE ANTIDEPRESSANTS DISRUPTS THE ABNORMAL STRESS-INDUCED EPIGENETIC PROGRAMMING AND PROVIDES EPIGENETIC PATTERNS THAT RESEMBLE EPIGENETIC BACKGROUND OF STRESS RESILIENT INDIVIDUALS. 2017 12 248 31 ADVANCE IN STRESS FOR DEPRESSIVE DISORDER. STRESS IS AN ADAPTIVE RESPONSE TO ENVIRONMENT AVERSIVE STIMULI AND A COMMON LIFE EXPERIENCE OF ONE'S DAILY LIFE. CHRONIC OR EXCESSIVE STRESS ESPECIALLY THAT HAPPENED IN EARLY LIFE IS FOUND TO BE DELETERIOUS TO INDIVIDUAL'S PHYSICAL AND MENTAL HEALTH, WHICH IS HIGHLY RELATED TO DEPRESSIVE DISORDERS ONSET. STRESSFUL LIFE EVENTS ARE CONSISTENTLY CONSIDERED TO BE THE HIGH-RISK FACTORS OF ENVIRONMENT FOR PREDISPOSING DEPRESSIVE DISORDERS. IN LINKING STRESSFUL LIFE EVENTS WITH DEPRESSIVE DISORDER ONSET, DYSREGULATED HPA AXIS ACTIVITY IS SUPPOSED TO PLAY AN IMPORTANT ROLE IN MEDIATING AVERSIVE IMPACTS OF LIFE STRESS ON BRAIN STRUCTURE AND FUNCTION. INCREASING EVIDENCE HAVE INDICATED THE STRONG ASSOCIATION OF STRESS, ESPECIALLY THE CHRONIC STRESS AND EARLY LIFE STRESS, WITH DEPRESSIVE DISORDERS DEVELOPMENT, WHILE THE ASSOCIATION OF STRESS WITH DEPRESSION IS MODERATED BY GENETIC RISK FACTORS, INCLUDING POLYMORPHISM OF SERT, BDNF, GR, FKBP5, MR, AND CRHR1. MEANWHILE, STRESSFUL LIFE EXPERIENCE PARTICULARLY EARLY LIFE STRESS WILL EXERT EPIGENETIC MODIFICATION IN THESE RISK GENES VIA DNA METHYLATION AND MIRNA REGULATION TO GENERATE LONG-LASTING EFFECTS ON THESE GENES EXPRESSION, WHICH IN TURN CAUSE BRAIN STRUCTURAL AND FUNCTIONAL ALTERATION, AND FINALLY INCREASE THE VULNERABILITY TO DEPRESSIVE DISORDERS. THEREFORE, THE INTERACTION OF ENVIRONMENT WITH GENE, IN WHICH STRESSFUL LIFE EXPOSURE INTERPLAY WITH GENETIC RISK FACTORS AND EPIGENETIC MODIFICATION, IS ESSENTIAL IN PREDICTING DEPRESSIVE DISORDERS DEVELOPMENT. AS THE MEDIATOR OF ENVIRONMENTAL RISK FACTORS, STRESS WILL FUNCTION TOGETHER WITH GENETIC AND EPIGENETIC MECHANISM TO INFLUENCE BRAIN STRUCTURE AND FUNCTION, PHYSIOLOGY AND PSYCHOLOGY, AND FINALLY THE VULNERABILITY TO DEPRESSIVE DISORDERS. 2019 13 6184 28 THE IMPACT OF ENVIRONMENTAL FACTORS IN SEVERE PSYCHIATRIC DISORDERS. DURING THE LAST DECADES, SCHIZOPHRENIA HAS BEEN REGARDED AS A DEVELOPMENTAL DISORDER. THE NEURODEVELOPMENTAL HYPOTHESIS PROPOSES SCHIZOPHRENIA TO BE RELATED TO GENETIC AND ENVIRONMENTAL FACTORS LEADING TO ABNORMAL BRAIN DEVELOPMENT DURING THE PRE- OR POSTNATAL PERIOD. FIRST DISEASE SYMPTOMS APPEAR IN EARLY ADULTHOOD DURING THE SYNAPTIC PRUNING AND MYELINATION PROCESS. META-ANALYSES OF STRUCTURAL MRI STUDIES REVEALING HIPPOCAMPAL VOLUME DEFICITS IN FIRST-EPISODE PATIENTS AND IN THE LONGITUDINAL DISEASE COURSE CONFIRM THIS HYPOTHESIS. APART FROM THE INFLUENCE OF RISK GENES IN SEVERE PSYCHIATRIC DISORDERS, ENVIRONMENTAL FACTORS MAY ALSO IMPACT BRAIN DEVELOPMENT DURING THE PERINATAL PERIOD. SEVERAL ENVIRONMENTAL FACTORS SUCH AS ANTENATAL MATERNAL VIRUS INFECTIONS, OBSTETRIC COMPLICATIONS ENTAILING HYPOXIA AS COMMON FACTOR OR STRESS DURING NEURODEVELOPMENT HAVE BEEN IDENTIFIED TO PLAY A ROLE IN SCHIZOPHRENIA AND BIPOLAR DISORDER, POSSIBLY CONTRIBUTING TO SMALLER HIPPOCAMPAL VOLUMES. IN MAJOR DEPRESSION, PSYCHOSOCIAL STRESS DURING THE PERINATAL PERIOD OR IN ADULTHOOD IS AN IMPORTANT TRIGGER. IN ANIMAL STUDIES, CHRONIC STRESS OR REPEATED ADMINISTRATION OF GLUCOCORTICOIDS HAVE BEEN SHOWN TO INDUCE DEGENERATION OF GLUCOCORTICOID-SENSITIVE HIPPOCAMPAL NEURONS AND MAY CONTRIBUTE TO THE PATHOPHYSIOLOGY OF AFFECTIVE DISORDERS. EPIGENETIC MECHANISMS ALTERING THE CHROMATIN STRUCTURE SUCH AS HISTONE ACETYLATION AND DNA METHYLATION MAY MEDIATE EFFECTS OF ENVIRONMENTAL FACTORS TO TRANSCRIPTIONAL REGULATION OF SPECIFIC GENES AND BE A PROMINENT FACTOR IN GENE-ENVIRONMENTAL INTERACTION. IN ANIMAL MODELS, GENE-ENVIRONMENTAL INTERACTION SHOULD BE INVESTIGATED MORE INTENSELY TO UNRAVEL PATHOPHYSIOLOGICAL MECHANISMS. THESE FINDINGS MAY LEAD TO NEW THERAPEUTIC STRATEGIES INFLUENCING EPIGENETIC TARGETS IN SEVERE PSYCHIATRIC DISORDERS. 2014 14 585 30 BEHAVIORAL PERINATOLOGY: BIOBEHAVIORAL PROCESSES IN HUMAN FETAL DEVELOPMENT. BEHAVIORAL PERINATOLOGY IS AS AN INTERDISCIPLINARY AREA OF RESEARCH THAT INVOLVES CONCEPTUALIZATION OF THEORETICAL MODELS AND CONDUCT OF EMPIRICAL STUDIES OF THE DYNAMIC TIME-, PLACE-, AND CONTEXT-DEPENDENT INTERPLAY BETWEEN BIOLOGICAL AND BEHAVIORAL PROCESSES IN FETAL, NEONATAL, AND INFANT LIFE USING AN EPIGENETIC FRAMEWORK OF DEVELOPMENT. THE BIOBEHAVIORAL PROCESSES OF PARTICULAR INTEREST TO OUR RESEARCH GROUP RELATE TO THE EFFECTS OF MATERNAL PRE- AND PERINATAL STRESS AND MATERNAL-PLACENTAL-FETAL STRESS PHYSIOLOGY. WE PROPOSE THAT BEHAVIORAL PERINATOLOGY RESEARCH MAY HAVE IMPORTANT IMPLICATIONS FOR A BETTER UNDERSTANDING OF THE PROCESSES THAT UNDERLIE OR CONTRIBUTE TO THE RISK OF THREE SETS OF OUTCOMES: PREMATURITY, ADVERSE NEURODEVELOPMENT, AND CHRONIC DEGENERATIVE DISEASES IN ADULTHOOD. BASED ON OUR UNDERSTANDING OF THE ONTOGENY OF HUMAN FETAL DEVELOPMENT AND THE PHYSIOLOGY OF PREGNANCY AND FETAL DEVELOPMENT, WE HAVE ARTICULATED A NEUROBIOLOGICAL MODEL OF PRE- AND PERINATAL STRESS. OUR MODEL PROPOSES THAT CHRONIC MATERNAL STRESS MAY EXERT A SIGNIFICANT INFLUENCE ON FETAL DEVELOPMENTAL OUTCOMES. MATERNAL STRESS MAY ACT VIA ONE OR MORE OF THREE MAJOR PHYSIOLOGICAL PATHWAYS: NEUROENDOCRINE, IMMUNE/INFLAMMATORY, AND VASCULAR. WE FURTHER SUGGEST THAT PLACENTAL CORTICOTROPIN-RELEASING HORMONE (CRH) MAY PLAY A CENTRAL ROLE IN COORDINATING THE EFFECTS OF ENDOCRINE, IMMUNE/INFLAMMATORY, AND VASCULAR PROCESSES ON FETAL DEVELOPMENTAL OUTCOMES. FINALLY, WE HYPOTHESIZE THAT THE EFFECTS OF MATERNAL STRESS ARE MODULATED BY THE NATURE, DURATION, AND TIMING OF OCCURRENCE OF STRESS DURING GESTATION. IN THIS PAPER, WE ELABORATE ON THE CONCEPTUAL AND EMPIRICAL BASIS FOR THIS MODEL, HIGHLIGHT SOME RELEVANT ISSUES AND QUESTIONS, AND MAKE RECOMMENDATIONS FOR FUTURE RESEARCH IN THIS AREA. 2002 15 229 22 ADAPTATION OR PATHOLOGY? THE ROLE OF PRENATAL STRESSOR TYPE AND INTENSITY IN THE DEVELOPMENTAL PROGRAMING OF ADULT PHENOTYPE. THE MOTHER IS THE MAJOR INTERFACE BETWEEN THE OFFSPRING AND ITS PRENATAL ENVIRONMENT. PRENATAL TOXINS AND STRESS-INDUCING PHYSICAL AGENTS ARE IMPORTANT FACTORS PROGRAMMING THE DEVELOPMENTAL TRAJECTORY OF MAMMALS THAT LIKELY INVOLVE EPIGENETIC MODIFICATIONS. HOWEVER, PRENATAL STRESSORS COMMONLY-USED IN THE LABORATORY (E.G. PRENATAL RESTRAINT STRESS AND PRENATAL CHRONIC VARIABLE STRESS) ARE TYPICALLY ADMINISTERED AT HIGH INTENSITIES. THESE EXPOSURES TYPICALLY LEAD TO PATHOLOGICAL PHENOTYPES SUPPORTING THE DEVELOPMENT ORIGIN OF HEALTH AND DISEASE HYPOTHESIS. IN THIS REVIEW, WE COMPARE THE PHENOTYPIC OUTCOMES OF THESE COMMONLY-USED PRENATAL STRESSORS TO AN ECOLOGICALLY-RELEVANT, PSYCHOGENIC STRESSOR THAT HAS BEEN PRESENT OVER EVOLUTIONARY TIMES, PREDATOR OR PREDATOR CUES PRESENCE. PRENATAL STRESS BY PREDATOR THREAT RESULTS IN BEHAVIORAL, PHYSIOLOGICAL, ENDOCRINE, TRANSCRIPT ABUNDANCE AND EPIGENETIC (DNA METHYLATION) MODIFICATIONS. THESE PHENOTYPIC MODIFICATIONS ARE CONSISTENT WITH DEVELOPMENTAL FORECASTING ACCORDING TO THE PREDICTIVE ADAPTIVE RESPONSE HYPOTHESIS, YIELDING ADAPTIVE RESPONSES IN ENVIRONMENTS WHERE SUCH PREDATION STRESS IS PRESENT. THE EVIDENCE DESCRIBED IN THIS REVIEW SUGGESTS THAT THE TYPE OF PRENATAL STRESS AGENT AND ITS INTENSITY MODIFIES THE PHENOTYPE EXPRESSED, WHICH CAN RANGE FROM ADAPTIVE TO PATHOLOGICAL. PRENATAL BISPHENOL A EXPOSURE STUDIES ARE PRESENTED AS AN EXAMPLE WHERE GRADED INTENSITIES (CONCENTRATIONS) OF PRENATAL TOXIN EXPOSURE CAN BE COMPARED DIRECTLY. FINALLY, WE EMPHASIZE THE IMPORTANCE OF STUDYING BOTH SEXES IN THESE STUDIES, AS SEX DIFFERENCES APPEAR TO BE A COMMON FEATURE OF THE RESPONSE TO PRENATAL STRESS. 2018 16 2264 38 EPIGENETIC PROGRAMMING BY STRESS AND GLUCOCORTICOIDS ALONG THE HUMAN LIFESPAN. PSYCHOSOCIAL STRESS TRIGGERS A SET OF BEHAVIORAL, NEURAL, HORMONAL, AND MOLECULAR RESPONSES THAT CAN BE A DRIVING FORCE FOR SURVIVAL WHEN ADAPTIVE AND TIME-LIMITED, BUT MAY ALSO CONTRIBUTE TO A HOST OF DISEASE STATES IF DYSREGULATED OR CHRONIC. THE BENEFICIAL OR DETRIMENTAL EFFECTS OF STRESS ARE LARGELY MEDIATED BY THE HYPOTHALAMIC-PITUITARY AXIS, A HIGHLY CONSERVED NEUROHORMONAL CASCADE THAT CULMINATES IN SYSTEMIC SECRETION OF GLUCOCORTICOIDS. GLUCOCORTICOIDS ACTIVATE THE GLUCOCORTICOID RECEPTOR, A UBIQUITOUS NUCLEAR RECEPTOR THAT NOT ONLY CAUSES WIDESPREAD CHANGES IN TRANSCRIPTIONAL PROGRAMS, BUT ALSO INDUCES LASTING EPIGENETIC MODIFICATIONS IN MANY TARGET TISSUES. WHILE THE EPIGENOME REMAINS SENSITIVE TO STRESSORS THROUGHOUT LIFE, WE PROPOSE TWO KEY PRINCIPLES THAT MAY GOVERN THE EPIGENETICS OF STRESS AND GLUCOCORTICOIDS ALONG THE LIFESPAN: FIRST, THE PRESENCE OF DISTINCT LIFE PERIODS, DURING WHICH THE EPIGENOME SHOWS HEIGHTENED PLASTICITY TO STRESS EXPOSURE, SUCH AS IN EARLY DEVELOPMENT AND AT ADVANCED AGE; AND, SECOND, THE POTENTIAL OF STRESS-INDUCED EPIGENETIC CHANGES TO ACCUMULATE THROUGHOUT LIFE BOTH IN SELECT CHROMATIN REGIONS AND AT THE GENOME-WIDE LEVEL. THESE PRINCIPLES HAVE IMPORTANT CLINICAL AND TRANSLATIONAL IMPLICATIONS, AND THEY SHOW STRIKING PARALLELS WITH THE EXISTENCE OF SENSITIVE DEVELOPMENTAL PERIODS AND THE CUMULATIVE IMPACT OF STRESSFUL EXPERIENCES ON THE DEVELOPMENT OF STRESS-RELATED PHENOTYPES. WE HOPE THAT THIS CONCEPTUAL MECHANISTIC FRAMEWORK WILL STIMULATE FRUITFUL RESEARCH THAT AIMS AT UNRAVELING THE MOLECULAR PATHWAYS THROUGH WHICH OUR LIFE STORIES SCULPT GENOMIC FUNCTION TO CONTRIBUTE TO COMPLEX BEHAVIORAL AND SOMATIC PHENOTYPES. 2017 17 2021 25 EPIGENETIC CHANGES ASSOCIATED WITH DIFFERENT TYPES OF STRESSORS AND SUICIDE. STRESS IS ASSOCIATED WITH VARIOUS EPIGENETIC CHANGES. SOME STRESS-INDUCED EPIGENETIC CHANGES ARE HIGHLY DYNAMIC, WHEREAS OTHERS ARE ASSOCIATED WITH LASTING MARKS ON THE EPIGENOME. IN OUR STUDY, A COMPREHENSIVE NARRATIVE REVIEW OF THE LITERATURE WAS PERFORMED BY INVESTIGATING THE EPIGENETIC CHANGES THAT OCCUR WITH ACUTE STRESS, CHRONIC STRESS, EARLY CHILDHOOD STRESS, AND TRAUMATIC STRESS EXPOSURES, ALONG WITH EXAMINING THOSE OBSERVED IN POST-MORTEM BRAINS OR BLOOD SAMPLES OF SUICIDE COMPLETERS AND ATTEMPTERS. IN ADDITION, THE TRANSGENERATIONAL EFFECTS OF THESE CHANGES ARE REPORTED. FOR ALL TYPES OF STRESS STUDIES EXAMINED, THE GENES NR3C1, OXTR, SLC6A4, AND BDNF REPRODUCIBLY SHOWED EPIGENETIC CHANGES, WITH SOME MODIFICATIONS OBSERVED TO BE PASSED DOWN TO SUBSEQUENT GENERATIONS FOLLOWING STRESS EXPOSURES. THE AFOREMENTIONED GENES ARE KNOWN TO BE INVOLVED IN NEURONAL DEVELOPMENT AND HORMONAL REGULATION AND ARE ALL ASSOCIATED WITH SUSCEPTIBILITY TO MENTAL HEALTH DISORDERS INCLUDING DEPRESSION, ANXIETY, PERSONALITY DISORDERS, AND PTSD (POST-TRAUMATIC STRESS DISORDER). FURTHER RESEARCH IS WARRANTED IN ORDER TO DETERMINE THE SCOPE OF EPIGENETIC ACTIONABLE TARGETS IN INDIVIDUALS SUFFERING FROM THE LONG-LASTING EFFECTS OF STRESSFUL EXPERIENCES. 2023 18 1754 29 EARLY LIFE STRESS, THE DEVELOPMENT OF AGGRESSION AND NEUROENDOCRINE AND NEUROBIOLOGICAL CORRELATES: WHAT CAN WE LEARN FROM ANIMAL MODELS? EARLY LIFE STRESS (CHILD AND ADOLESCENT ABUSE, NEGLECT AND TRAUMA) INDUCES ROBUST ALTERATIONS IN EMOTIONAL AND SOCIAL FUNCTIONING RESULTING IN ENHANCED RISK FOR THE DEVELOPMENT OF PSYCHOPATHOLOGIES SUCH AS MOOD AND AGGRESSIVE DISORDERS. HERE, AN OVERVIEW IS GIVEN ON RECENT FINDINGS IN PRIMATE AND RODENT MODELS OF EARLY LIFE STRESS, DEMONSTRATING THAT CHRONIC DEPRIVATION OF EARLY MATERNAL CARE AS WELL AS CHRONIC DEPRIVATION OF EARLY PHYSICAL INTERACTIONS WITH PEERS ARE PROFOUND RISK FACTORS FOR THE DEVELOPMENT OF INAPPROPRIATE AGGRESSIVE BEHAVIORS. ALTERATIONS IN THE HYPOTHALAMIC-PITUITARY-ADRENOCORTICAL (HPA), VASOPRESSIN AND SEROTONIN SYSTEMS AND THEIR RELEVANCE FOR THE REGULATION OF AGGRESSION ARE DISCUSSED. DATA SUGGEST THAT SOCIAL DEPRIVATION-INDUCED INAPPROPRIATE FORMS OF AGGRESSION ARE ASSOCIATED WITH HIGH OR LOW HPA AXIS (RE)ACTIVITY AND A GENERALLY LOWER FUNCTIONING OF THE SEROTONIN SYSTEM IN ADULTHOOD. MOREOVER, GENETIC AND EPIGENETIC MODIFICATIONS IN HPA AND SEROTONIN SYSTEMS INFLUENCE THE OUTCOME OF EARLY LIFE STRESS AND MAY EVEN MODERATE ADVERSE EFFECTS OF EARLY SOCIAL DEPRIVATION ON AGGRESSION. A MORE COMPREHENSIVE STUDY OF AGGRESSION, NEUROENDOCRINE, NEUROBIOLOGICAL AND (EPI)GENETIC CORRELATES OF EARLY LIFE STRESS USING ANIMAL MODELS IS NECESSARY TO PROVIDE A BETTER UNDERSTANDING OF THE INVASIVE AGGRESSIVE DEFICITS OBSERVED IN HUMANS EXPOSED TO CHILD MALTREATMENT. 2009 19 3313 26 HIPPOCAMPAL BDNF IN PHYSIOLOGICAL CONDITIONS AND SOCIAL ISOLATION. EXPOSURE OF AN ORGANISM TO CHRONIC PSYCHOSOCIAL STRESS MAY AFFECT BRAIN-DERIVED NEUROTROPHIC FACTOR (BDNF) EXPRESSION THAT HAS BEEN IMPLICATED IN THE ETIOLOGY OF PSYCHIATRIC DISORDERS, SUCH AS DEPRESSION. GIVEN THAT DEPRESSION IN HUMANS HAS BEEN LINKED WITH SOCIAL STRESS, THE CHRONIC SOCIAL STRESS PARADIGMS FOR MODELING PSYCHIATRIC DISORDERS IN ANIMALS HAVE THUS BEEN DEVELOPED. CHRONIC SOCIAL ISOLATION IN ANIMAL MODELS GENERALLY CAUSES CHANGES IN HYPOTHALAMIC-PITUITARY-ADRENAL AXIS FUNCTIONING, ASSOCIATED WITH ANXIETY- AND DEPRESSIVE-LIKE BEHAVIORS. ALSO, THIS CHRONIC STRESS CAUSES DOWNREGULATION OF BDNF PROTEIN AND MRNA IN THE HIPPOCAMPUS, A STRESS-SENSITIVE BRAIN REGION CLOSELY RELATED TO THE PATHOPHYSIOLOGY OF DEPRESSION. IN THIS REVIEW, WE DISCUSS THE CURRENT KNOWLEDGE REGARDING THE STRUCTURE, FUNCTION, INTRACELLULAR SIGNALING, INTER-INDIVIDUAL DIFFERENCES AND EPIGENETIC REGULATION OF BDNF IN BOTH PHYSIOLOGICAL CONDITIONS AND DEPRESSION AND CHANGES IN CORTICOSTERONE LEVELS, AS A MARKER OF STRESS RESPONSE. SINCE BDNF LEVELS ARE AGE DEPENDENT IN HUMANS AND RODENTS, THIS REVIEW WILL ALSO HIGHLIGHT THE EFFECTS OF ADOLESCENT AND ADULT CHRONIC SOCIAL ISOLATION MODELS OF BOTH GENDERS ON THE BDNF EXPRESSION. 2017 20 1745 24 EARLY LIFE ADVERSITY AS A RISK FACTOR FOR FIBROMYALGIA IN LATER LIFE. THE IMPACT OF EARLY LIFE EVENTS IS INCREASINGLY BECOMING APPARENT, AS STUDIES INVESTIGATE HOW EARLY CHILDHOOD CAN SHAPE LONG-TERM PHYSIOLOGY AND BEHAVIOUR. FIBROMYALGIA (FM), WHICH IS CHARACTERISED BY INCREASED PAIN SENSITIVITY AND A NUMBER OF AFFECTIVE CO-MORBIDITIES, HAS AN UNCLEAR ETIOLOGY. THIS PAPER DISCUSSES RISK FACTORS FROM EARLY LIFE THAT MAY INCREASE THE OCCURRENCE OR SEVERITY OF FM IN LATER LIFE: PAIN EXPERIENCE DURING NEONATAL LIFE CAUSES LONG-LASTING CHANGES IN NOCICEPTIVE CIRCUITRY AND INCREASES PAIN SENSITIVITY IN THE OLDER ORGANISM; PREMATURE BIRTH AND RELATED STRESSOR EXPOSURE CAUSE LASTING CHANGES IN STRESS RESPONSIVITY; MATERNAL DEPRIVATION AFFECTS ANXIETY-LIKE BEHAVIOURS THAT MAY BE PARTIALLY MEDIATED BY EPIGENETIC MODULATION OF THE GENOME-ALL THESE ADULT PHENOTYPES ARE STRIKINGLY SIMILAR TO SYMPTOMS DISPLAYED BY FM SUFFERERS. IN ADDITION, CHILDHOOD TRAUMA AND EXPOSURE TO SUBSTANCES OF ABUSE MAY CAUSE LASTING CHANGES IN DEVELOPING NEUROTRANSMITTER AND ENDOCRINE CIRCUITS THAT ARE LINKED TO ANXIETY AND STRESS RESPONSES. 2012