1 5465 122 RESILIENCE TO STRESS: LESSONS FROM RODENTS ABOUT NATURE VERSUS NURTURE. INDIVIDUAL DIFFERENCES IN HUMAN TEMPERAMENT INFLUENCE HOW WE RESPOND TO STRESS AND CAN CONFER VULNERABILITY (OR RESILIENCE) TO EMOTIONAL DISORDERS. FOR EXAMPLE, HIGH LEVELS OF BEHAVIORAL INHIBITION IN CHILDREN PREDICT INCREASED RISK OF MOOD AND ANXIETY DISORDERS IN LATER LIFE. THE BIOLOGICAL UNDERPINNINGS OF TEMPERAMENT ARE UNKNOWN, ALTHOUGH IMPROVED UNDERSTANDING CAN OFFER INSIGHT INTO THE PATHOGENESIS OF EMOTIONAL DISORDERS. OUR LABORATORY HAS USED A RAT MODEL OF TEMPERAMENTAL DIFFERENCES TO STUDY NEURODEVELOPMENTAL FACTORS THAT LEAD TO A HIGHLY INHIBITED, STRESS VULNERABLE PHENOTYPE. SELECTIVE BREEDING FOR HIGH VERSUS LOW BEHAVIORAL RESPONSE TO NOVELTY CREATED TWO RAT STRAINS THAT EXHIBIT DRAMATIC BEHAVIOR DIFFERENCES OVER MULTIPLE DOMAINS RELEVANT TO EMOTIONAL DISORDERS. LOW NOVELTY RESPONDER (BLR) RATS EXHIBIT HIGH LEVELS OF BEHAVIORAL INHIBITION, PASSIVE STRESS COPING, ANHEDONIA, DECREASED SOCIABILITY AND VULNERABILITY TO CHRONIC STRESS COMPARED TO HIGH NOVELTY RESPONDERS (BHRS). ON THE OTHER HAND, BHRS EXHIBIT HIGH LEVELS OF BEHAVIORAL DIS-INHIBITION, ACTIVE COPING, AND AGGRESSION. THIS REVIEW ARTICLE SUMMARIZES OUR WORK WITH THE BHR/BLR MODEL SHOWING THE DEVELOPMENTAL EMERGENCE OF THE BHR/BLR PHENOTYPES, THE ROLE THE ENVIRONMENT PLAYS IN SHAPING IT, AND THE INVOLVEMENT OF EPIGENETIC PROCESSES SUCH AS DNA METHYLATION THAT MEDIATE DIFFERENCES IN EMOTIONALITY AND STRESS REACTIVITY. 2022 2 1548 61 DNA METHYLATION IN THE DEVELOPING HIPPOCAMPUS AND AMYGDALA OF ANXIETY-PRONE VERSUS RISK-TAKING RATS. ALL ORGANISMS EXHIBIT A WIDE RANGE OF EMOTIONAL BEHAVIORS AND INTERACT WITH THE ENVIRONMENT IN DIFFERENT WAYS. SOME INDIVIDUALS MAY BE MORE QUIET AND SHY WHEREAS OTHERS ARE MORE OUTGOING AND ADVENTUROUS. THESE TEMPERAMENTAL AND PERSONALITY DIFFERENCES CAN PREDISPOSE INDIVIDUALS TO CERTAIN PSYCHOPATHOLOGIES WHICH MAY BE INFLUENCED BY GENETIC VULNERABILITY AND/OR EARLY LIFE EXPERIENCES. RODENT MODELS CAN BE USED TO RECAPITULATE EMOTIONAL REACTIVITY DIFFERENCES, AND THESE MODELS CAN, IN TURN, BE USED TO EXAMINE POTENTIAL NEUROBIOLOGICAL UNDERPINNINGS OF THESE TRAITS. THE PRESENT STUDY UTILIZES TWO STRAINS OF RATS THAT WERE SELECTIVELY BRED FOR DIFFERENCES IN NOVELTY SEEKING. HIGH NOVELTY-RESPONDING (BHR) RATS ARE VERY ACTIVE IN RESPONSE TO NOVELTY, EXHIBIT EXAGGERATED RISK-TAKING, AGGRESSION, IMPULSIVITY, AND SHOW INCREASED BEHAVIORAL RESPONSE TO COCAINE. LOW NOVELTY-RESPONDING (BLR) RATS SHOW INCREASED ANXIETY, DEPRESSIVE BEHAVIOR AND VULNERABILITY TO CHRONIC STRESS. ONE WAY IN WHICH THE BHR VERSUS BLR BEHAVIORAL PHENOTYPES MAY DIFFER IS THROUGH EPIGENETIC MODIFICATION OF DNA. DNA CAN BE MODIFIED THROUGH PROCESSES SUCH AS ACETYLATION OR METHYLATION TO EITHER ENHANCE OR SUBDUE GENE EXPRESSION. THIS STUDY EXAMINES PUTATIVE DIFFERENCES IN METHYLATION LEVELS IN THE HIPPOCAMPUS AND AMYGDALA OF DEVELOPING BHR-BLR RATS. PREVIOUS RESEARCH OBSERVED WIDESPREAD GENE EXPRESSION DIFFERENCES IN THE BLR DEVELOPING HIPPOCAMPUS, AND THE CURRENT STUDY AIMS TO BEGIN TO EXAMINE POTENTIAL EPIGENETIC FACTORS THAT MAY CONTRIBUTE TO THOSE GENE DIFFERENCES. THE AMYGDALA WAS CHOSEN BECAUSE IT IS INVOLVED IN EMOTIONAL PROCESSES, IN PART THROUGH ITS CONNECTIONS WITH THE HIPPOCAMPUS. THEREFORE, THE PRESENT STUDY USED IN SITU HYBRIDIZATION TO ASSESS THE EXPRESSION OF DNA METHYLTRANSFERASE-1 (DNMT1) MRNA IN THE HIPPOCAMPUS, AMYGDALA AND SEVERAL OTHER BRAIN AREAS OF BHR AND BLR PUPS AT THREE DEVELOPMENTAL TIME POINTS: POSTNATAL DAYS (P) 7, 14, AND 21. WE FOCUSED ON THE FIRST 3 POSTNATAL WEEKS, IN PART TO PARALLEL OUR EARLY MICROARRAY GENE EXPRESSION WORK, AND BECAUSE THIS REPRESENTS A CRITICAL PERIOD OF BRAIN DEVELOPMENT, WHICH SHAPES INDIVIDUALS' LIFELONG EMOTIONAL AND STRESS REACTIVITY. WE FOUND SIGNIFICANT DIFFERENCES IN DENTATE GYRUS AND CA3 REGIONS OF THE HIPPOCAMPUS AT P7 WITH NO DIFFERENCES SEEN AT P14 OR P21. INTERESTINGLY, WE ALSO FOUND SIGNIFICANT BHR-BLR DNMT1 DIFFERENCES AT P7 WITHIN THE LATERAL, BASOLATERAL AND MEDIAL NUCLEI OF THE AMYGDALA, WITH NO DIFFERENCE AT P14 AND P21, SUGGESTING THAT THE FIRST POSTNATAL WEEK IS A CRITICAL PERIOD FOR DNA METHYLATION DURING BRAIN DEVELOPMENT. 2012 3 291 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 4 3313 28 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 5 1981 31 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 6 2159 22 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 7 678 36 BRAIN DEVELOPMENT UNDER STRESS: HYPOTHESES OF GLUCOCORTICOID ACTIONS REVISITED. ONE OF THE CONUNDRUMS IN TODAY'S STRESS RESEARCH IS WHY SOME INDIVIDUALS FLOURISH AND OTHERS PERISH UNDER SIMILAR STRESSFUL CONDITIONS. IT IS RECOGNIZED THAT THIS INDIVIDUAL VARIABILITY IN ADAPTATION TO STRESS DEPENDS ON THE OUTCOME OF THE INTERACTION OF GENETIC AND COGNITIVE/EMOTIONAL INPUTS IN WHICH GLUCOCORTICOID HORMONES AND RECEPTORS PLAY A CRUCIAL ROLE. HENCE ONE APPROACH TOWARDS UNDERSTANDING INDIVIDUAL VARIATION IN STRESS COPING IS HOW GLUCOCORTICOID ACTIONS CAN CHANGE FROM PROTECTIVE TO HARMFUL. TO ADDRESS THIS QUESTION WE FOCUS ON FOUR HYPOTHESES THAT ARE CONNECTED AND NOT MUTUAL EXCLUSIVE. FIRST, THE CLASSICAL GLUCOCORTICOID CASCADE HYPOTHESIS, IN WHICH THE INABILITY TO COPE WITH CHRONIC STRESS CAUSES A VICIOUS CYCLE OF EXCESS GLUCOCORTICOID AND DOWNREGULATION OF GLUCOCORTICOID RECEPTORS (GR) IN THE HIPPOCAMPUS TRIGGERING A FEED-FORWARD CASCADE OF DEGENERATION AND DISEASE. SECOND, THE BALANCE HYPOTHESIS, WHICH TAKES ALSO THE LIMBIC MINERALOCORTICOID RECEPTORS (MR) INTO ACCOUNT AND PROPOSES THAT AN INTEGRAL LIMBIC MR:GR IMBALANCE IS CAUSAL TO ALTERED PROCESSING OF INFORMATION IN CIRCUITS UNDERLYING FEAR, REWARD, SOCIAL BEHAVIOUR AND RESILIENCE, DYSREGULATION OF THE HYPOTHALAMIC-PITUITARY-ADRENAL (HPA) AXIS AND IMPAIRMENT OF BEHAVIOURAL ADAPTATION. THE MR:GR BALANCE IS ALTERED BY GENE VARIANTS OF THESE RECEPTOR COMPLEXES AND EXPERIENCE-RELATED FACTORS, WHICH CAN INDUCE LASTING EPIGENETIC CHANGES IN THE EXPRESSION OF THESE RECEPTORS. A PARTICULAR POTENT EPIGENETIC STIMULUS IS THE MATERNAL ENVIRONMENT WHICH IS FUNDAMENTAL FOR THE MATERNAL MEDIATION HYPOTHESIS. THE OUTCOME OF PERINATAL GENE X ENVIRONMENT INTERACTION, AND THUS OF MR:GR-MEDIATED FUNCTIONS DEPENDS HOWEVER, ON THE DEGREE OF 'MATCHING' WITH ENVIRONMENTAL DEMANDS IN LATER LIFE. THE PREDICTIVE ADAPTATION HYPOTHESIS THEREFORE PRESENTS A CONCEPTUAL FRAMEWORK TO EXAMINE THE ROLE OF GLUCOCORTICOIDS IN UNDERSTANDING INDIVIDUAL PHENOTYPIC DIFFERENCES IN STRESS-RELATED BEHAVIOURS OVER THE LIFESPAN. 2010 8 2445 32 EPIGENETIC STATUS OF GDNF IN THE VENTRAL STRIATUM DETERMINES SUSCEPTIBILITY AND ADAPTATION TO DAILY STRESSFUL EVENTS. STRESSFUL EVENTS DURING ADULTHOOD ARE POTENT ADVERSE ENVIRONMENTAL FACTORS THAT CAN PREDISPOSE INDIVIDUALS TO PSYCHIATRIC DISORDERS, INCLUDING DEPRESSION; HOWEVER, MANY INDIVIDUALS EXPOSED TO STRESSFUL EVENTS CAN ADAPT AND FUNCTION NORMALLY. WHILE STRESS VULNERABILITY MAY INFLUENCE DEPRESSION, THE MOLECULAR MECHANISMS UNDERLYING THE SUSCEPTIBILITY AND ADAPTATION TO CHRONIC STRESS WITHIN THE BRAIN ARE POORLY UNDERSTOOD. IN THIS STUDY, TWO GENETICALLY DISTINCT MOUSE STRAINS THAT EXHIBIT DIFFERENT BEHAVIORAL RESPONSES TO CHRONIC STRESS WERE USED TO DEMONSTRATE HOW THE DIFFERENTIAL EPIGENETIC STATUS OF THE GLIAL CELL-DERIVED NEUROTROPHIC FACTOR (GDNF) GENE IN THE VENTRAL STRIATUM MODULATES SUSCEPTIBILITY AND ADAPTATION TO CHRONIC STRESS. OUR RESULTS SUGGEST THAT THE HISTONE MODIFICATIONS AND DNA METHYLATION OF THE GDNF PROMOTER HAVE CRUCIAL ROLES IN THE CONTROL OF BEHAVIORAL RESPONSES TO CHRONIC STRESS. OUR DATA PROVIDE INSIGHTS INTO THESE MECHANISMS, SUGGESTING THAT EPIGENETIC MODIFICATIONS OF GDNF, ALONG WITH GENETIC AND ENVIRONMENTAL FACTORS, CONTRIBUTE TO BEHAVIORAL RESPONSES TO STRESS. 2011 9 6228 28 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 10 2471 29 EPIGENETIC TRANSGENERATIONAL INHERITANCE OF ALTERED STRESS RESPONSES. ANCESTRAL ENVIRONMENTAL EXPOSURES HAVE PREVIOUSLY BEEN SHOWN TO PROMOTE EPIGENETIC TRANSGENERATIONAL INHERITANCE AND INFLUENCE ALL ASPECTS OF AN INDIVIDUAL'S LIFE HISTORY. IN ADDITION, PROXIMATE LIFE EVENTS SUCH AS CHRONIC STRESS HAVE DOCUMENTED EFFECTS ON THE DEVELOPMENT OF PHYSIOLOGICAL, NEURAL, AND BEHAVIORAL PHENOTYPES IN ADULTHOOD. WE USED A SYSTEMS BIOLOGY APPROACH TO INVESTIGATE IN MALE RATS THE INTERACTION OF THE ANCESTRAL MODIFICATIONS CARRIED TRANSGENERATIONALLY IN THE GERM LINE AND THE PROXIMATE MODIFICATIONS INVOLVING CHRONIC RESTRAINT STRESS DURING ADOLESCENCE. WE FIND THAT A SINGLE EXPOSURE TO A COMMON-USE FUNGICIDE (VINCLOZOLIN) THREE GENERATIONS REMOVED ALTERS THE PHYSIOLOGY, BEHAVIOR, METABOLIC ACTIVITY, AND TRANSCRIPTOME IN DISCRETE BRAIN NUCLEI IN DESCENDANT MALES, CAUSING THEM TO RESPOND DIFFERENTLY TO CHRONIC RESTRAINT STRESS. THIS ALTERATION OF BASELINE BRAIN DEVELOPMENT PROMOTES A CHANGE IN NEURAL GENOMIC ACTIVITY THAT CORRELATES WITH CHANGES IN PHYSIOLOGY AND BEHAVIOR, REVEALING THE INTERACTION OF GENETICS, ENVIRONMENT, AND EPIGENETIC TRANSGENERATIONAL INHERITANCE IN THE SHAPING OF THE ADULT PHENOTYPE. THIS IS AN IMPORTANT DEMONSTRATION IN AN ANIMAL THAT ANCESTRAL EXPOSURE TO AN ENVIRONMENTAL COMPOUND MODIFIES HOW DESCENDANTS OF THESE PROGENITOR INDIVIDUALS PERCEIVE AND RESPOND TO A STRESS CHALLENGE EXPERIENCED DURING THEIR OWN LIFE HISTORY. 2012 11 5164 36 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 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 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 14 4578 34 N(6) -METHYLADENOSINE MODIFICATION IN CHRONIC STRESS RESPONSE DUE TO SOCIAL HIERARCHY POSITIONING OF MICE. APPROPRIATELY RESPONDING TO STRESSFUL EVENTS IS ESSENTIAL FOR MAINTAINING HEALTH AND WELL-BEING OF ANY ORGANISM. CONCERNING SOCIAL STRESS, THE RESPONSE IS NOT ALWAYS AS STRAIGHTFORWARD AS REACTING TO PHYSICAL STRESSORS, E.G., EXTREME HEAT, AND THUS HAS TO BE BALANCED SUBTLY. PARTICULARLY, REGULATORY MECHANISMS CONTRIBUTING TO GAINING RESILIENCE IN THE FACE OF MILD SOCIAL STRESS ARE NOT FULLY DECIPHERED YET. WE EMPLOYED AN INTRINSIC SOCIAL HIERARCHY STRESS PARADIGM IN MICE OF BOTH SEXES TO IDENTIFY CRITICAL FACTORS FOR POTENTIAL COPING STRATEGIES. WHILE GLOBAL TRANSCRIPTOMIC CHANGES COULD NOT BE OBSERVED IN MALE MICE, SEVERAL GENES PREVIOUSLY REPORTED TO BE INVOLVED IN SYNAPTIC PLASTICITY, LEARNING, AND ANXIETY-LIKE BEHAVIOR WERE DIFFERENTIALLY REGULATED IN FEMALE MICE. MOREOVER, CHANGES IN N(6)-METHYLADENOSINE (M(6)A)-MODIFICATION OF MRNA OCCURRED ASSOCIATED WITH CORTICOSTERONE LEVEL IN BOTH SEXES WITH, E.G., INCREASED GLOBAL AMOUNT IN SUBMISSIVE FEMALE MICE. IN ACCORDANCE WITH THIS, METTL14 AND WTAP, SUBUNITS OF THE METHYLTRANSFERASE COMPLEX, SHOWED ELEVATED LEVELS IN SUBMISSIVE FEMALE MICE. N(6)-ADENOSYL-METHYLATION IS THE MOST PROMINENT TYPE OF MRNA METHYLATION AND PLAYS A CRUCIAL ROLE IN PROCESSES SUCH AS METABOLISM, BUT ALSO RESPONSE TO PHYSICAL STRESS. OUR FINDINGS UNDERPIN ITS ESSENTIAL ROLE BY ALSO PROVIDING A LINK TO SOCIAL STRESS EVOKED BY HIERARCHY BUILDING WITHIN SAME-SEX GROUPS. AS RECENTLY, SEARCH FOR SMALL MOLECULE MODIFIERS FOR THE RESPECTIVE CLASS OF RNA MODIFYING ENZYMES HAS STARTED, THIS MIGHT EVEN LEAD TO NEW THERAPEUTIC APPROACHES AGAINST STRESS DISORDERS. 2021 15 1364 38 DEVELOPMENTAL NEUROENDOCRINOLOGY OF EARLY-LIFE STRESS: IMPACT ON CHILD DEVELOPMENT AND BEHAVIOR. OUR INTERNAL BALANCE, OR HOMEOSTASIS, IS THREATENED OR PERCEIVED AS THREATENED BY STRESSFUL STIMULI, THE STRESSORS. THE STRESS SYSTEM IS A HIGHLY CONSERVED SYSTEM THAT ADJUSTS HOMEOSTASIS TO THE RESTING STATE. THROUGH THE CONCURRENT ACTIVATION OF THE HYPOTHALAMIC-PITUITARY-ADRENAL AXIS AND THE LOCUS COERULEUS/NOREPINEPHRINE-AUTONOMIC NERVOUS SYSTEMS, THE STRESS SYSTEM PROVIDES THE APPROPRIATE PHYSICAL AND BEHAVIORAL RESPONSES, COLLECTIVELY TERMED AS "STRESS RESPONSE", TO RESTORE HOMEOSTASIS. IF THE STRESS RESPONSE IS PROLONGED, EXCESSIVE OR EVEN INADEQUATE, SEVERAL ACUTE OR CHRONIC STRESS-RELATED PATHOLOGIC CONDITIONS MAY DEVELOP IN CHILDHOOD, ADOLESCENCE AND ADULT LIFE. ON THE OTHER HAND, EARLY-LIFE EXPOSURE TO STRESSORS HAS BEEN RECOGNIZED AS A MAJOR CONTRIBUTING FACTOR UNDERLYING THE PATHOGENESIS OF NON-COMMUNICABLE DISORDERS, INCLUDING NEURODEVELOPMENTAL DISORDERS. ACCUMULATING EVIDENCE SUGGESTS THAT EARLY-LIFE STRESS HAS BEEN ASSOCIATED WITH AN INCREASED RISK FOR ATTENTION DEFICIT HYPERACTIVITY DISORDER AND AUTISM SPECTRUM DISORDER IN THE OFFSPRING, ALTHOUGH FINDINGS ARE STILL CONTROVERSIAL. NEVERTHELESS, AT THE MOLECULAR LEVEL, EARLY-LIFE STRESSORS ALTER THE CHEMICAL STRUCTURE OF CYTOSINES LOCAT- ED IN THE REGULATORY REGIONS OF GENES, MOSTLY THROUGH THE ADDITION OF METHYL GROUPS. THESE EPIGENETIC MODIFICATIONS RESULT IN THE SUPPRESSION OF GENE EXPRESSION WITHOUT CHANGING THE DNA SEQUENCE. IN ADDITION TO DNA METHYLATION, SEVERAL LINES OF EVIDENCE SUPPORT THE ROLE OF NON-CODING RNAS IN THE EVOLVING FIELD OF EPIGENETICS. IN THIS REVIEW ARTICLE, WE PRESENT THE ANATOMICAL AND FUNCTIONAL COMPO- NENTS OF THE STRESS SYSTEM, DISCUSS THE PROPER, IN TERMS OF QUALITY AND QUANTITY, STRESS RESPONSE, AND PROVIDE AN UPDATE ON THE IMPACT OF EARLY-LIFE STRESS ON CHILD DEVELOPMENT AND BEHAVIOR. 2023 16 3001 31 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 17 1754 35 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 18 235 25 ADDING FUEL TO THE FIRE: THE IMPACT OF STRESS ON THE AGEING BRAIN. BOTH AGEING AND CHRONIC STRESS ARE ASSOCIATED WITH ALTERED BRAIN PLASTICITY, DYSREGULATION OF THE IMMUNE SYSTEM, AND AN INCREASED RISK OF DEVELOPING BRAIN DISORDERS; ALL OF WHICH HAVE CONSEQUENCES FOR COGNITIVE AND EMOTIONAL PROCESSING. HERE WE EXAMINE THE SIMILARITIES BETWEEN BEHAVIOURAL CHANGES DURING AGEING AND STRESS ALTERED BEHAVIOURS (ANXIETY, DEPRESSIVE-LIKE BEHAVIOUR, COGNITION, AND SOCIABILITY) IN RODENTS AND HUMANS. THE MOLECULAR MECHANISMS HYPOTHESISED TO MEDIATE AGE-RELATED CHANGES IN BRAIN FUNCTION INCLUDING DYSFUNCTION OF THE HYPOTHALAMIC-PITUITARY-ADRENAL (HPA) AXIS, DYSREGULATION OF NEUROTRANSMISSION AND NEUROTROPHIC FACTOR SIGNALLING, INCREASED INFLAMMATORY STATE, GENETIC AND EPIGENETIC CHANGES, OXIDATIVE STRESS, METABOLIC CHANGES, AND CHANGES IN THE MICROBIOTA-GUT-BRAIN AXIS ARE DISCUSSED. FINALLY, WE EXPLORE HOW THE ALREADY STRESSED AGED BRAIN PSYCHOLOGICALLY AND PHYSIOLOGICALLY RESPONDS TO EXTERNAL STRESSORS. 2015 19 4701 36 NICOTINE AND THE ADOLESCENT BRAIN. ADOLESCENCE ENCOMPASSES A SENSITIVE DEVELOPMENTAL PERIOD OF ENHANCED CLINICAL VULNERABILITY TO NICOTINE, TOBACCO, AND E-CIGARETTES. WHILE THERE ARE SOCIOCULTURAL INFLUENCES, DATA AT PRECLINICAL AND CLINICAL LEVELS INDICATE THAT THIS ADOLESCENT SENSITIVITY HAS STRONG NEUROBIOLOGICAL UNDERPINNINGS. ALTHOUGH DEFINITIONS OF ADOLESCENCE VARY, THE HALLMARK OF THIS PERIOD IS A PROFOUND REORGANIZATION OF BRAIN REGIONS NECESSARY FOR MATURE COGNITIVE AND EXECUTIVE FUNCTION, WORKING MEMORY, REWARD PROCESSING, EMOTIONAL REGULATION, AND MOTIVATED BEHAVIOR. REGULATING CRITICAL FACETS OF BRAIN MATURATION ARE NICOTINIC ACETYLCHOLINE RECEPTORS (NACHRS). HOWEVER, PERTURBATIONS OF CHOLINERGIC SYSTEMS DURING THIS TIME WITH NICOTINE, VIA TOBACCO OR E-CIGARETTES, HAVE UNIQUE CONSEQUENCES ON ADOLESCENT DEVELOPMENT. IN THIS REVIEW, WE HIGHLIGHT RECENT CLINICAL AND PRECLINICAL DATA EXAMINING THE ADOLESCENT BRAIN'S DISTINCT NEUROBIOLOGY AND UNIQUE SENSITIVITY TO NICOTINE. FIRST, WE DISCUSS WHAT DEFINES ADOLESCENCE BEFORE REVIEWING NORMATIVE STRUCTURAL AND NEUROCHEMICAL ALTERATIONS THAT PERSIST UNTIL EARLY ADULTHOOD, WITH AN EMPHASIS ON DOPAMINERGIC SYSTEMS. WE REVIEW HOW ACUTE EXPOSURE TO NICOTINE IMPACTS BRAIN DEVELOPMENT AND HOW DRUG RESPONSES DIFFER FROM THOSE SEEN IN ADULTS. FINALLY, WE DISCUSS THE PERSISTENT ALTERATIONS IN NEURONAL SIGNALING AND COGNITIVE FUNCTION THAT RESULT FROM CHRONIC NICOTINE EXPOSURE, WHILE HIGHLIGHTING A LOW DOSE, SEMI-CHRONIC EXPOSURE PARADIGM THAT MAY BETTER MODEL ADOLESCENT TOBACCO USE. WE ARGUE THAT NICOTINE EXPOSURE, INCREASINGLY OCCURRING AS A RESULT OF E-CIGARETTE USE, MAY INDUCE EPIGENETIC CHANGES THAT SENSITIZE THE BRAIN TO OTHER DRUGS AND PRIME IT FOR FUTURE SUBSTANCE ABUSE. 2015 20 1745 28 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