1 4857 156 OPTOGENETIC STIMULATION OF THE ANTERIOR CINGULATE CORTEX AMELIORATES AUTISTIC-LIKE BEHAVIORS IN RATS INDUCED BY NEONATAL ISOLATION, CAUDATE PUTAMEN AS A SITE FOR ALTERATION. EPIGENETIC AGENTS, SUCH AS NEONATAL ISOLATION DURING NEURODEVELOPMENTAL PERIOD OF LIFE, CAN CHANGE VARIOUS REGIONS OF THE BRAIN. IT MAY FURTHER INDUCE PSYCHOLOGICAL DISORDERS SUCH AS AUTISTIC-LIKE PHENOMENA. THIS STUDY INDICATED THE ROLE OF CHRONIC INCREASED ANTERIOR CINGULATE CORTEX (ACC) OUTPUT ON ALTERATION OF CAUDATE PUTAMEN (CPU) AS A MAIN BEHAVIOR REGULATOR REGION OF THE BRAIN IN ADULT MATERNAL DEPRIVED (MD) RATS. FOR MAKING AN ANIMAL MODEL, NEONATES WERE ISOLATED FROM THEIR MOTHERS IN POSTNATAL DAYS (PND 1-10, 3 H/DAY). SUBSEQUENTLY, THEY BILATERALLY RECEIVED PLENTI-CAMKIIA-HCHR2 (H134R)-MCHERRY-WPRE VIRUS IN ACC AREA VIA STEREOTAXIC SURGERY IN PND50. AFTER 22 DAYS, THESE REGIONS WERE EXPOSED TO BLUE LASER (473 NM) FOR SIX CONSECUTIVE DAYS (15 MIN/DAY). THEN, BEHAVIORAL DEFICITS WERE TESTED AND WERE COMPARED WITH CONTROL GROUP IN THE FOLLOWING DAY. ANIMALS WERE IMMEDIATELY KILLED AND THEIR BRAINS WERE PREPARED FOR TISSUE PROCESSING. RESULTS SHOWED THAT NEONATAL ISOLATION INDUCES AUTISTIC-LIKE BEHAVIORS AND LEADS TO OVEREXPRESSION OF NMDAR1 AND NOX2-GP91(PHOX) PROTEINS AND ELEVATION OF CATALASE ACTIVITY IN THE CPU REGIONS OF THE ADULT OFFSPRING COMPARED WITH CONTROL GROUP. CHRONIC OPTOGENETIC STIMULATION OF ACC NEURONS CONTAINING (CHR2+) LED TO SIGNIFICANT REDUCTION IN THE APPEARANCE OF STEREOTYPICAL BEHAVIOR AND ALIEN-PHOBIA IN MD RATS. THE AMOUNT OF NMDAR1 AND NOX2-GP91(PHOX) EXPRESSION AND THE CATALASE ACTIVITY IN CPU WERE REDUCED AFTER THIS TREATMENT. THEREFORE, AUTISTIC-LIKE BEHAVIOR SEEMS TO BE RELATED WITH ELEVATION OF NMDAR1 AND NOX2-GP91(PHOX) PROTEIN LEVELS THAT ENHANCE THE EFFECT OF GLUTAMATERGIC PROJECTION ON CPU REGIONS. OPTOGENETIC TREATMENT ALSO COULD AMELIORATE BEHAVIORAL DEFICITS BY MODULATING THESE PROTEIN DENSITIES. 2019 2 1089 25 COCAINE-RELATED DNA METHYLATION IN CAUDATE NEURONS ALTERS 3D CHROMATIN STRUCTURE OF THE IRXA GENE CLUSTER. EPIGENETIC MECHANISMS, LIKE THOSE INVOLVING DNA METHYLATION, ARE THOUGHT TO MEDIATE THE RELATIONSHIP BETWEEN CHRONIC COCAINE DEPENDENCE AND MOLECULAR CHANGES IN ADDICTION-RELATED NEUROCIRCUITRY, BUT HAVE BEEN UNDERSTUDIED IN HUMAN BRAIN. WE INITIALLY USED REDUCED REPRESENTATION BISULFITE SEQUENCING (RRBS) TO GENERATE A METHYLOME-WIDE PROFILE OF COCAINE DEPENDENCE IN HUMAN POST-MORTEM CAUDATE TISSUE. WE FOCUSED ON THE IROQUOIS HOMEOBOX A (IRXA) GENE CLUSTER, WHERE HYPOMETHYLATION IN EXON 3 OF IRX2 IN NEURONAL NUCLEI WAS ASSOCIATED WITH COCAINE DEPENDENCE. WE REPLICATED THIS FINDING IN AN INDEPENDENT COHORT AND FOUND SIMILAR RESULTS IN THE DORSAL STRIATUM FROM COCAINE SELF-ADMINISTERING MICE. USING EPIGENOME EDITING AND 3C ASSAYS, WE DEMONSTRATED A CAUSAL RELATIONSHIP BETWEEN METHYLATION WITHIN THE IRX2 GENE BODY, CTCF PROTEIN BINDING, THREE-DIMENSIONAL (3D) CHROMATIN INTERACTION, AND GENE EXPRESSION. TOGETHER, THESE FINDINGS SUGGEST THAT COCAINE-RELATED HYPOMETHYLATION OF IRX2 CONTRIBUTES TO THE DEVELOPMENT AND MAINTENANCE OF COCAINE DEPENDENCE THROUGH ALTERATIONS IN 3D CHROMATIN STRUCTURE IN THE CAUDATE NUCLEUS. 2021 3 2423 29 EPIGENETIC SIGNATURES OF SMOKING IN FIVE BRAIN REGIONS. (1) BACKGROUND: EPIGENOME-WIDE ASSOCIATION STUDIES (EWAS) IN PERIPHERAL BLOOD HAVE REPEATEDLY FOUND ASSOCIATIONS BETWEEN TOBACCO SMOKING AND ABERRANT DNA METHYLATION (DNAM), BUT LITTLE IS KNOWN ABOUT DNAM SIGNATURES OF SMOKING IN THE HUMAN BRAIN, WHICH MAY CONTRIBUTE TO THE PATHOPHYSIOLOGY OF ADDICTIVE BEHAVIOR OBSERVED IN CHRONIC SMOKERS. (2) METHODS: WE INVESTIGATED THE SIMILARITY OF DNAM SIGNATURES IN MATCHED BLOOD AND POSTMORTEM BRAIN SAMPLES (N = 10). IN ADDITION, WE PERFORMED EWASS IN FIVE BRAIN REGIONS BELONGING TO THE NEUROCIRCUITRY OF ADDICTION: ANTERIOR CINGULATE CORTEX (ACC), BRODMANN AREA 9, CAUDATE NUCLEUS, PUTAMEN, AND VENTRAL STRIATUM (N = 38-72). (3) RESULTS: CG15925993 WITHIN THE LOC339975 GENE WAS EPIGENOME-WIDE SIGNIFICANT IN THE ACC. OF 16 IDENTIFIED DIFFERENTIALLY METHYLATED REGIONS, TWO (PRSS50 AND LINC00612/A2M-AS1) OVERLAPPED BETWEEN MULTIPLE BRAIN REGIONS. FUNCTIONAL ENRICHMENT WAS DETECTED FOR BIOLOGICAL PROCESSES RELATED TO NEURONAL DEVELOPMENT, INFLAMMATORY SIGNALING AND IMMUNE CELL MIGRATION. ADDITIONALLY, OUR RESULTS INDICATE THE ASSOCIATION OF THE WELL-KNOWN AHRR CPG SITE CG05575921 WITH SMOKING IN THE BRAIN. (4) CONCLUSION: THE PRESENT STUDY PROVIDES FURTHER EVIDENCE OF THE STRONG RELATIONSHIP BETWEEN ABERRANT DNAM AND SMOKING. 2022 4 1706 38 DYNORPHIN/KOP AND NOCICEPTIN/NOP GENE EXPRESSION AND EPIGENETIC CHANGES BY COCAINE IN RAT STRIATUM AND NUCLEUS ACCUMBENS. COCAINE INDUCES NEUROCHEMICAL CHANGES OF ENDOGENOUS PRODYNORPHIN-KAPPA OPIOID RECEPTOR (PDYN-KOP) AND PRONOCICEPTIN/ORPHANINFQ-NOCICEPTIN RECEPTOR (PN/OFQ-NOP) SYSTEMS. BOTH SYSTEMS PLAY AN IMPORTANT ROLE IN REWARDING MECHANISMS AND ADDICTIVE STIMULUS PROCESSING BY MODULATING DRUG-INDUCED DOPAMINERGIC ACTIVATION IN THE MESOCORTICO-LIMBIC BRAIN AREAS. THEY ARE ALSO INVOLVED IN REGULATING STRESS MECHANISMS RELATED TO ADDICTION. THE AIM OF THIS STUDY WAS TO INVESTIGATE POSSIBLE CHANGES OF GENE EXPRESSION OF THE DYNORPHINERGIC AND NOCICEPTINERGIC SYSTEM COMPONENTS IN THE NUCLEUS ACCUMBENS (NA) AND IN MEDIAL AND LATERAL CAUDATE PUTAMEN (MCPU AND LCPU, RESPECTIVELY) OF RATS, FOLLOWING CHRONIC SUBCUTANEOUS INFUSION OF COCAINE. IN ADDITION, THE EPIGENETIC HISTONE MODIFICATIONS H3K4ME3 AND H3K27ME3 (AN ACTIVATING AND A REPRESSIVE MARKER, RESPECTIVELY) AT THE PROMOTER LEVEL OF THE PDYN, KOP, PN/OFQ AND NOP GENES WERE INVESTIGATED. RESULTS SHOWED THAT COCAINE INDUCED PDYN GENE EXPRESSION UP-REGULATION IN THE NA AND LCPU, AND ITS DOWN-REGULATION IN THE MCPU, WHEREAS KOP MRNA LEVELS WERE UNCHANGED. MOREOVER, COCAINE EXPOSURE DECREASED PN/OFQ GENE EXPRESSION IN THE NA AND LCPU, WHILE NOP MRNA LEVELS APPEARED SIGNIFICANTLY INCREASED IN THE NA AND DECREASED IN THE LCPU. SPECIFIC CHANGES OF THE H3K4ME3 AND H3K27ME3 LEVELS WERE FOUND AT PDYN, PN/OFQ, AND NOP GENE PROMOTER, CONSISTENT WITH THE OBSERVED GENE EXPRESSION ALTERATIONS. THE PRESENT FINDINGS CONTRIBUTE TO BETTER DEFINE THE ROLE OF ENDOGENOUS PDYN-KOP AND PN/OFQ-NOP SYSTEMS IN NEUROPLASTICITY MECHANISMS FOLLOWING CHRONIC COCAINE TREATMENT. THE EPIGENETIC HISTONE MODIFICATIONS UNDERLYING THE GENE EXPRESSION CHANGES LIKELY MEDIATE THE EFFECTS OF COCAINE ON TRANSCRIPTIONAL REGULATION OF SPECIFIC GENE PROMOTERS THAT RESULT IN LONG-LASTING DRUG-INDUCED PLASTICITY. 2014 5 4236 31 METHYLATION OF THE TYROSINE HYDROXYLASE GENE IS DYSREGULATED BY COCAINE DEPENDENCE IN THE HUMAN STRIATUM. COCAINE DEPENDENCE IS A CHRONIC, RELAPSING DISORDER CAUSED BY LASTING CHANGES IN THE BRAIN. ANIMAL STUDIES HAVE IDENTIFIED COCAINE-RELATED ALTERATIONS IN STRIATAL DNA METHYLATION; HOWEVER, IT IS UNCLEAR HOW METHYLATION IS RELATED TO COCAINE DEPENDENCE IN HUMANS. WE GENERATED METHYLOMIC PROFILES OF THE NUCLEUS ACCUMBENS USING HUMAN POSTMORTEM BRAINS FROM A COHORT OF INDIVIDUALS WITH COCAINE DEPENDENCE AND HEALTHY CONTROLS (N = 25 PER GROUP). WE FOUND HYPERMETHYLATION IN A CLUSTER OF CPGS WITHIN THE GENE BODY OF TYROSINE HYDROXYLASE (TH), CONTAINING A PUTATIVE BINDING SITE FOR THE EARLY GROWTH RESPONSE 1 (EGR1) TRANSCRIPTION FACTOR, WHICH IS HYPERMETHYLATED IN THE CAUDATE NUCLEUS OF COCAINE-DEPENDENT INDIVIDUALS. WE REPLICATED THIS FINDING AND FOUND IT TO BE SPECIFIC TO STRIATAL NEURONAL NUCLEI. FURTHERMORE, THIS LOCUS DEMONSTRATES ENHANCER ACTIVITY WHICH IS ATTENUATED BY METHYLATION AND ENHANCED BY EGR1 OVEREXPRESSION. THESE RESULTS SUGGEST THAT COCAINE DEPENDENCE ALTERS THE EPIGENETIC REGULATION OF DOPAMINERGIC SIGNALING GENES. 2021 6 5535 28 ROLE OF BRD4 PHOSPHORYLATION IN THE NUCLEUS ACCUMBENS IN RELAPSE TO COCAINE-SEEKING BEHAVIOR IN MICE. COCAINE ADDICTION IS A CHRONIC RELAPSING BRAIN DISORDER CHARACTERIZED BY COMPULSIVE DRUG SEEKING. PRELIMINARY STUDY SUGGESTED THAT BROMODOMAIN-CONTAINING PROTEIN 4 (BRD4), AN EPIGENETIC READER PROTEIN, PARTICIPATES IN COCAINE-INDUCED REWARD AND NEUROPLASTICITY. HOWEVER, THE EXACT ROLE OF BRD4 IN COCAINE ADDICTION, PARTICULARLY COCAINE RELAPSE, REMAINS ELUSIVE. IN THIS STUDY, WE FOUND THAT BRD4 PHOSPHORYLATION IN THE NUCLEUS ACCUMBENS (NAC) WAS CLOSELY RELATED TO THE MAINTENANCE OF COCAINE REINFORCEMENT AND RELAPSE IN DIFFERENT COCAINE EXPOSURE PARADIGMS. COCAINE SIGNIFICANTLY INCREASED THE BINDING OF PHOSPHORYLATED BRD4 (PBRD4) AT THE PROMOTER OF GRIA2 AND BDNF GENES IN THE NAC. (+)JQ1, A SELECTIVE BRD4 INHIBITOR, MARKEDLY REDUCED THE REINFORCEMENT AND REINSTATEMENT OF COCAINE-SEEKING BEHAVIORS, WHICH WAS ACCOMPANIED BY THE DECREASED EXPRESSIONS OF GRIA2 AND BDNF. FURTHERMORE, CHROMATIN IMMUNOPRECIPITATION ASSAY SHOWED THAT (+)JQ1 CLEARLY ATTENUATED COCAINE-ENHANCED BINDING OF PBRD4 AT THE PROMOTOR OF GRIA2 AND BDNF GENES. BLOCKADE OF CASEIN KINASE II SIGNIFICANTLY ATTENUATED BRD4 PHOSPHORYLATION AND COCAINE RELAPSE-LIKE BEHAVIORS, SUGGESTING THE IMPORTANT ROLE OF PBRD4 IN MODULATING COCAINE EFFECT. TOGETHER, OUR FINDINGS SUGGEST THAT BRD4 PHOSPHORYLATION IN THE NAC MODULATES MULTIPLE ADDICTION-RELATED BEHAVIORS OF COCAINE AND PARTICULARLY RELAPSE TO COCAINE-SEEKING BEHAVIORS. INHIBITION OF BRD4 ACTIVITY MAY BE A NOVEL TARGET AGAINST COCAINE ADDICTION AND RELAPSE. 2020 7 4218 34 METHYL SUPPLEMENTATION ATTENUATES COCAINE-SEEKING BEHAVIORS AND COCAINE-INDUCED C-FOS ACTIVATION IN A DNA METHYLATION-DEPENDENT MANNER. EPIGENETIC MECHANISMS, SUCH AS HISTONE MODIFICATIONS, REGULATE RESPONSIVENESS TO DRUGS OF ABUSE, SUCH AS COCAINE, BUT RELATIVELY LITTLE IS KNOWN ABOUT THE REGULATION OF ADDICTIVE-LIKE BEHAVIORS BY DNA METHYLATION. TO INVESTIGATE THE INFLUENCE OF DNA METHYLATION ON THE LOCOMOTOR-ACTIVATING EFFECTS OF COCAINE AND ON DRUG-SEEKING BEHAVIOR, RATS RECEIVING METHYL SUPPLEMENTATION VIA CHRONIC L-METHIONINE (MET) UNDERWENT EITHER A SENSITIZATION REGIMEN OF INTERMITTENT COCAINE INJECTIONS OR INTRAVENOUS SELF-ADMINISTRATION OF COCAINE, FOLLOWED BY CUE-INDUCED AND DRUG-PRIMED REINSTATEMENT. MET BLOCKED SENSITIZATION TO THE LOCOMOTOR-ACTIVATING EFFECTS OF COCAINE AND ATTENUATED DRUG-PRIMED REINSTATEMENT, WITH NO EFFECT ON CUE-INDUCED REINSTATEMENT OR SUCROSE SELF-ADMINISTRATION AND REINSTATEMENT. FURTHERMORE, UPREGULATION OF DNA METHYLTRANSFERASE 3A AND 3B AND GLOBAL DNA HYPOMETHYLATION WERE OBSERVED IN THE NUCLEUS ACCUMBENS CORE (NAC), BUT NOT IN THE MEDIAL PREFRONTAL CORTEX (MPFC), OF COCAINE-PRETREATED RATS. GLUTAMATERGIC PROJECTIONS FROM THE MPFC TO THE NAC ARE CRITICALLY INVOLVED IN THE REGULATION OF COCAINE-PRIMED REINSTATEMENT, AND ACTIVATION OF BOTH BRAIN REGIONS IS SEEN IN HUMAN ADDICTS WHEN REEXPOSED TO THE DRUG. WHEN COMPARED WITH VEHICLE-PRETREATED RATS, THE IMMEDIATE EARLY GENE C-FOS (A MARKER OF NEURONAL ACTIVATION) WAS UPREGULATED IN THE NAC AND MPFC OF COCAINE-PRETREATED RATS AFTER COCAINE-PRIMED REINSTATEMENT, AND CHRONIC MET TREATMENT BLOCKED ITS INDUCTION IN BOTH REGIONS. COCAINE-INDUCED C-FOS EXPRESSION IN THE NAC WAS ASSOCIATED WITH REDUCED METHYLATION AT CPG DINUCLEOTIDES IN THE C-FOS GENE PROMOTER, EFFECTS REVERSED BY MET TREATMENT. OVERALL, THESE DATA SUGGEST THAT DRUG-SEEKING BEHAVIORS ARE, IN PART, ATTRIBUTABLE TO A DNA METHYLATION-DEPENDENT PROCESS, LIKELY OCCURRING AT SPECIFIC GENE LOCI (E.G., C-FOS) IN THE REWARD PATHWAY. 2015 8 4498 38 MORPHINE REGULATES ARGONAUTE 2 AND TH EXPRESSION AND ACTIVITY BUT NOT MIR-133B IN MIDBRAIN DOPAMINERGIC NEURONS. EPIGENETIC CHANGES SUCH AS MICRORNAS (MIRS)/AGO2-INDUCED GENE SILENCING REPRESENT COMPLEX MOLECULAR SIGNATURE THAT REGULATE CELLULAR PLASTICITY. RECENT STUDIES SHOWED INVOLVEMENT OF MIRS AND AGO2 IN DRUG ADDICTION. IN THIS STUDY, WE SHOW THAT CHANGES IN GENE EXPRESSION INDUCED BY MORPHINE AND MORPHINE WITHDRAWAL OCCUR WITH CONCOMITANT EPIGENETIC MODIFICATIONS IN THE MESOLIMBIC DOPAMINERGIC (DA) PATHWAY [VENTRAL TEGMENTAL AREA (VTA)/NUCLEUS ACCUMBENS (NAC) SHELL], WHICH IS CRITICALLY INVOLVED IN DRUG-INDUCED DEPENDENCE. WE FOUND THAT ACUTE OR CHRONIC MORPHINE ADMINISTRATION AS WELL AS MORPHINE WITHDRAWAL DID NOT MODIFY MIR-133B MESSENGER RNA (MRNA) EXPRESSION IN THE VTA, WHEREAS AGO2 PROTEIN LEVELS WERE DECREASED AND INCREASED IN MORPHINE-DEPENDENT RATS AND AFTER MORPHINE WITHDRAWAL, RESPECTIVELY. THESE CHANGES WERE PARALLELED WITH ENHANCED AND DECREASED NAC TYROSINE HYDROXYLASE (TH) PROTEIN (AN EARLY DA MARKER) IN MORPHINE-DEPENDENT RATS AND AFTER WITHDRAWAL, RESPECTIVELY. WE ALSO OBSERVED CHANGES IN TH MRNA EXPRESSION IN THE VTA THAT COULD BE RELATED TO AGO2-INDUCED TRANSLATIONAL REPRESSION OF TH MRNA DURING MORPHINE WITHDRAWAL. HOWEVER, THE VTA NUMBER OF TH-POSITIVE NEURONS SUFFERED NO ALTERATIONS AFTER THE DIFFERENT TREATMENT. ACUTE MORPHINE ADMINISTRATION PRODUCED A MARKED INCREASE IN TH ACTIVITY AND DA TURNOVER IN THE NAC (SHELL). IN CONTRAST, PRECIPITATED MORPHINE WITHDRAWAL DECREASED TH ACTIVATION AND DID NOT CHANGE DA TURNOVER. THESE FINDINGS PROVIDE NEW INFORMATION INTO THE POSSIBLE CORRELATION BETWEEN AGO2/MIRS COMPLEX REGULATION AND DA NEURONS PLASTICITY DURING OPIATE ADDICTION. 2015 9 4878 47 OVEREXPRESSION OF THE HISTONE DIMETHYLTRANSFERASE G9A IN NUCLEUS ACCUMBENS SHELL INCREASES COCAINE SELF-ADMINISTRATION, STRESS-INDUCED REINSTATEMENT, AND ANXIETY. REPEATED EXPOSURE TO COCAINE INDUCES LASTING EPIGENETIC CHANGES IN NEURONS THAT PROMOTE THE DEVELOPMENT AND PERSISTENCE OF ADDICTION. ONE EPIGENETIC ALTERATION INVOLVES REDUCTIONS IN LEVELS OF THE HISTONE DIMETHYLTRANSFERASE G9A IN NUCLEUS ACCUMBENS (NAC) AFTER CHRONIC COCAINE ADMINISTRATION. THIS REDUCTION IN G9A MAY ENHANCE COCAINE REWARD BECAUSE OVEREXPRESSING G9A IN THE NAC DECREASES COCAINE-CONDITIONED PLACE PREFERENCE. THEREFORE, WE HYPOTHESIZED THAT HSV-MEDIATED G9A OVEREXPRESSION IN THE NAC SHELL (NACSH) WOULD ATTENUATE COCAINE SELF-ADMINISTRATION (SA) AND COCAINE-SEEKING BEHAVIOR. INSTEAD, WE FOUND THAT G9A OVEREXPRESSION, AND THE RESULTING INCREASE IN HISTONE 3 LYSINE 9 DIMETHYLATION (H3K9ME2), INCREASES SENSITIVITY TO COCAINE REINFORCEMENT AND ENHANCES MOTIVATION FOR COCAINE IN SELF-ADMINISTERING MALE RATS. MOREOVER, WHEN G9A OVEREXPRESSION IS LIMITED TO THE INITIAL 15 D OF COCAINE SA TRAINING, IT PRODUCES AN ENDURING POSTEXPRESSION ENHANCEMENT IN COCAINE SA AND PROLONGED (OVER 5 WEEKS) INCREASES IN REINSTATEMENT OF COCAINE SEEKING INDUCED BY FOOT-SHOCK STRESS, BUT IN THE ABSENCE OF CONTINUED GLOBAL ELEVATIONS IN H3K9ME2. THE INCREASE IN STRESS-INDUCED REINSTATEMENT IS PARALLELED BY HEIGHTENED ANXIETY MEASURES, SUGGESTING THAT COUNTERING THE COCAINE-INDUCED DECREASES IN ENDOGENOUS G9A WITH ECTOPIC G9A OVEREXPRESSION LEADS TO LASTING ANXIOGENIC EFFECTS. FINALLY, WE FOUND AN ENDURING REDUCTION IN PHOSPHORYLATED CAMP-RESPONSE ELEMENT BINDING PROTEIN LEVELS IN THE NACSH THAT COULD ACCOUNT FOR THE INCREASED ANXIETY. THESE DATA DEMONSTRATE A NOVEL ROLE FOR G9A IN PROMOTING COMORBID COCAINE ADDICTION AND ANXIETY AND SUGGEST THAT INCREASED EPIGENETIC REPRESSION OF TRANSCRIPTION THROUGH H3K9 DURING COCAINE USE CAN HAVE LONG-LASTING AND UNEXPECTED NEGATIVE CONSEQUENCES ON BEHAVIOR.SIGNIFICANCE STATEMENT COCAINE ADDICTION IS A NEUROPSYCHIATRIC DISORDER THAT IS DETRIMENTAL TO SOCIETY AND CURRENTLY HAS NO EFFECTIVE TREATMENTS. THE DIFFICULTY IN TREATING DRUG ADDICTION IS COMPOUNDED BY THE HIGH COMORBIDITY WITH OTHER PSYCHIATRIC ILLNESSES, INCLUDING ANXIETY DISORDERS. HERE, WE DEMONSTRATE THAT G9A, AN EPIGENETIC REPRESSOR OF GENE EXPRESSION, ACTING IN THE NUCLEUS ACCUMBENS, A BRAIN REWARD REGION, IS CAPABLE OF INCREASING BOTH ADDICTION- AND ANXIETY-LIKE BEHAVIORS IN RATS. THESE FINDINGS ARE INTRIGUING BECAUSE REPEATED COCAINE EXPOSURE DECREASES G9A IN THIS REGION AND THEREBY ENHANCES EXPRESSION OF CERTAIN ADDICTION-PROMOTING GENES. HOWEVER, OUR RESULTS SUGGEST THAT COUNTERING THIS COCAINE-INDUCED DECREASE IN G9A ACTIVITY ACTUALLY EXACERBATES ADDICTION AND SENSITIVITY TO RELAPSE UNDER STRESSFUL SITUATIONS. 2018 10 5819 33 STRESS CHANGES AMPHETAMINE RESPONSE, D2 RECEPTOR EXPRESSION AND EPIGENETIC REGULATION IN LOW-ANXIETY RATS. THE AIM OF THIS STUDY WAS TO ASSESS THE INFLUENCE OF CHRONIC RESTRAINT STRESS ON AMPHETAMINE (AMPH)-RELATED APPETITIVE 50-KHZ ULTRASONIC VOCALISATIONS (USVS) IN RATS DIFFERING IN FREEZING DURATION IN A CONTEXTUAL FEAR TEST (CFT), I.E. HR (HIGH-ANXIETY RESPONSIVE) AND LR (LOW-ANXIETY RESPONSIVE) RATS. THE LR AND THE HR RATS, PREVIOUSLY EXPOSED TO AN AMPH BINGE EXPERIENCE, DIFFERED IN SENSITIVITY TO AMPH'S REWARDING EFFECTS, MEASURED AS APPETITIVE VOCALISATIONS. MOREOVER, CHRONIC RESTRAINT STRESS ATTENUATED AMPH-RELATED APPETITIVE VOCALISATIONS IN THE LR RATS BUT HAD NO INFLUENCE ON THE HR RATS' BEHAVIOUR. TO SPECIFY, THE RESTRAINT LR RATS VOCALISED APPETITIVELY LESS IN THE AMPH-ASSOCIATED CONTEXT AND AFTER AN AMPH CHALLENGE THAN THE CONTROL LR RATS. THIS PHENOMENON WAS ASSOCIATED WITH A DECREASE IN THE MRNA LEVEL FOR D2 DOPAMINE RECEPTOR IN THE AMYGDALA AND ITS PROTEIN EXPRESSION IN THE BASAL AMYGDALA (BA) AND OPPOSITE CHANGES IN THE NUCLEUS ACCUMBENS (NAC) - AN INCREASE IN THE MRNA LEVEL FOR D2 DOPAMINE RECEPTOR AND ITS PROTEIN EXPRESSION IN THE NAC SHELL, COMPARED TO CONTROL CONDITIONS. MOREOVER, WE OBSERVED THAT CHRONIC RESTRAINT STRESS INFLUENCED EPIGENETIC REGULATION IN THE LR AND THE HR RATS DIFFERENTLY. THE CONTRASTING CHANGES WERE OBSERVED IN THE DENTATE GYRUS (DG) OF THE HIPPOCAMPUS - THE LR RATS PRESENTED A DECREASE, BUT THE HR RATS SHOWED AN INCREASE IN H3K9 TRIMETHYLATION. THE RESTRAINT LR RATS ALSO SHOWED HIGHER MIR-494 AND MIR-34C LEVELS IN THE NAC THAN THE CONTROL LR GROUP. OUR STUDY PROVIDES BEHAVIOURAL AND BIOCHEMICAL DATA CONCERNING THE ROLE OF DIFFERENCES IN FEAR-CONDITIONED RESPONSE IN STRESS VULNERABILITY AND AMPH-ASSOCIATED APPETITIVE BEHAVIOUR. THE LR RATS WERE LESS SENSITIVE TO THE REWARDING EFFECTS OF AMPH WHEN PREVIOUSLY EXPOSED TO CHRONIC STRESS THAT WAS ACCOMPANIED BY CHANGES IN D2 DOPAMINE RECEPTOR EXPRESSION AND EPIGENETIC REGULATION IN MESOLIMBIC AREAS. 2019 11 2012 24 EPIGENETIC BASIS OF OPIATE SUPPRESSION OF BDNF GENE EXPRESSION IN THE VENTRAL TEGMENTAL AREA. BRAIN-DERIVED NEUROTROPHIC FACTOR (BDNF) HAS A CRUCIAL ROLE IN MODULATING NEURAL AND BEHAVIORAL PLASTICITY TO DRUGS OF ABUSE. WE FOUND A PERSISTENT DOWNREGULATION OF EXON-SPECIFIC BDNF EXPRESSION IN THE VENTRAL TEGMENTAL AREA (VTA) IN RESPONSE TO CHRONIC OPIATE EXPOSURE, WHICH WAS MEDIATED BY SPECIFIC EPIGENETIC MODIFICATIONS AT THE CORRESPONDING BDNF GENE PROMOTERS. EXPOSURE TO CHRONIC MORPHINE INCREASED STALLING OF RNA POLYMERASE II AT THESE BDNF PROMOTERS IN VTA AND ALTERED PERMISSIVE AND REPRESSIVE HISTONE MODIFICATIONS AND OCCUPANCY OF THEIR REGULATORY PROTEINS AT THE SPECIFIC PROMOTERS. FURTHERMORE, WE FOUND THAT MORPHINE SUPPRESSED BINDING OF PHOSPHO-CREB (CAMP RESPONSE ELEMENT BINDING PROTEIN) TO BDNF PROMOTERS IN VTA, WHICH RESULTED FROM ENRICHMENT OF TRIMETHYLATED H3K27 AT THE PROMOTERS, AND THAT DECREASED NURR1 (NUCLEAR RECEPTOR RELATED-1) EXPRESSION ALSO CONTRIBUTED TO BDNF REPRESSION AND ASSOCIATED BEHAVIORAL PLASTICITY TO MORPHINE. OUR FINDINGS SUGGEST PREVIOUSLY UNKNOWN EPIGENETIC MECHANISMS OF MORPHINE-INDUCED MOLECULAR AND BEHAVIORAL NEUROADAPTATIONS. 2015 12 3203 33 HDAC3 ACTIVITY WITHIN THE NUCLEUS ACCUMBENS REGULATES COCAINE-INDUCED PLASTICITY AND BEHAVIOR IN A CELL-TYPE-SPECIFIC MANNER. EPIGENETIC MECHANISMS REGULATE PROCESSES OF NEUROPLASTICITY CRITICAL TO COCAINE-INDUCED BEHAVIORS. THIS INCLUDES THE CLASS I HISTONE DEACETYLASE (HDAC) HDAC3, KNOWN TO ACT AS A NEGATIVE REGULATOR OF COCAINE-ASSOCIATED MEMORY FORMATION WITHIN THE NUCLEUS ACCUMBENS (NAC). DESPITE THIS, IT REMAINS UNKNOWN HOW COCAINE ALTERS HDAC3-DEPENDENT MECHANISMS. HERE, WE PROFILED HDAC3 EXPRESSION AND ACTIVITY IN TOTAL NAC MOUSE TISSUE FOLLOWING COCAINE EXPOSURE. ALTHOUGH CHRONIC COCAINE DID NOT AFFECT EXPRESSION OF HDAC3 WITHIN THE NAC, CHRONIC COCAINE DID AFFECT PROMOTER-SPECIFIC CHANGES IN HDAC3 AND H4K8AC OCCUPANCY. THESE CHANGES IN PROMOTER OCCUPANCY CORRELATED WITH COCAINE-INDUCED CHANGES IN EXPRESSION OF PLASTICITY-RELATED GENES. TO CAUSALLY DETERMINE WHETHER COCAINE-INDUCED PLASTICITY IS MEDIATED BY HDAC3'S DEACETYLASE ACTIVITY, WE OVEREXPRESSED A DEACETYLASE-DEAD HDAC3 POINT MUTANT (HDAC3-Y298H-V5) WITHIN THE NAC OF ADULT MALE MICE. WE FOUND THAT DISRUPTING HDAC3'S ENZYMATIC ACTIVITY ALTERED SELECTIVE CHANGES IN GENE EXPRESSION AND SYNAPTIC PLASTICITY FOLLOWING COCAINE EXPOSURE, DESPITE HAVING NO EFFECTS ON COCAINE-INDUCED BEHAVIORS. IN FURTHER ASSESSING HDAC3'S ROLE WITHIN THE NAC, WE OBSERVED THAT CHRONIC COCAINE INCREASES HDAC3 EXPRESSION IN DRD1 BUT NOT DRD2-CELLS OF THE NAC. MOREOVER, WE DISCOVERED THAT HDAC3 ACTS SELECTIVELY WITHIN D1R CELL-TYPES TO REGULATE COCAINE-ASSOCIATED MEMORY FORMATION AND COCAINE-SEEKING. OVERALL, THESE RESULTS SUGGEST THAT COCAINE INDUCES CELL-TYPE-SPECIFIC CHANGES IN EPIGENETIC MECHANISMS TO PROMOTE PLASTICITY IMPORTANT FOR DRIVING COCAINE-RELATED BEHAVIORS.SIGNIFICANCE STATEMENT DRUGS OF ABUSE ALTER MOLECULAR MECHANISMS THROUGHOUT THE REWARD CIRCUITRY THAT CAN LEAD TO PERSISTENT DRUG-ASSOCIATED BEHAVIORS. EPIGENETIC REGULATORS ARE CRITICAL DRIVERS OF DRUG-INDUCED CHANGES IN GENE EXPRESSION. HERE, WE DEMONSTRATE THAT THE ACTIVITY OF AN EPIGENETIC ENZYME PROMOTES NEUROPLASTICITY WITHIN THE NUCLEUS ACCUMBENS (NAC) CRITICAL TO COCAINE ACTION. IN ADDITION, WE DEMONSTRATE THAT THESE CHANGES IN EPIGENETIC ACTIVITY DRIVE COCAINE-SEEKING BEHAVIORS IN A CELL-TYPE-SPECIFIC MANNER. THESE FINDINGS ARE KEY IN UNDERSTANDING AND TARGETING COCAINE'S IMPACT OF NEURAL CIRCUITRY AND BEHAVIOR. 2021 13 695 31 BRG1 IN THE NUCLEUS ACCUMBENS REGULATES COCAINE-SEEKING BEHAVIOR. BACKGROUND: DRUG ADDICTION IS DEFINED AS A CHRONIC DISEASE CHARACTERIZED BY COMPULSIVE DRUG SEEKING AND EPISODES OF RELAPSE DESPITE PROLONGED PERIODS OF DRUG ABSTINENCE. NEUROBIOLOGICAL ADAPTATIONS, INCLUDING TRANSCRIPTIONAL AND EPIGENETIC ALTERATIONS IN THE NUCLEUS ACCUMBENS, ARE THOUGHT TO CONTRIBUTE TO THIS LIFE-LONG DISEASE STATE. WE PREVIOUSLY DEMONSTRATED THAT THE TRANSCRIPTION FACTOR SMAD3 IS INCREASED AFTER 7 DAYS OF WITHDRAWAL FROM COCAINE SELF-ADMINISTRATION. HOWEVER, IT IS STILL UNKNOWN WHICH ADDITIONAL FACTORS PARTICIPATE IN THE PROCESS OF CHROMATIN REMODELING AND FACILITATE THE BINDING OF SMAD3 TO PROMOTER REGIONS OF TARGET GENES. HERE, WE EXAMINED THE POSSIBLE INTERACTION OF BRG1-ALSO KNOWN AS SMARCA4, AN ADENOSINE TRIPHOSPHATASE-CONTAINING CHROMATIN REMODELER-AND SMAD3 IN RESPONSE TO COCAINE EXPOSURE. METHODS: THE EXPRESSION OF BRG1, AS WELL AS ITS BINDING TO SMAD3 AND TARGET GENE PROMOTER REGIONS, WAS EVALUATED IN THE NUCLEUS ACCUMBENS AND DORSAL STRIATUM OF RATS USING WESTERN BLOTTING, CO-IMMUNOPRECIPITATION, AND CHROMATIN IMMUNOPRECIPITATION FOLLOWING ABSTINENCE FROM COCAINE SELF-ADMINISTRATION. RATS WERE ASSESSED FOR COCAINE-SEEKING BEHAVIORS AFTER EITHER INTRA-ACCUMBAL INJECTIONS OF THE BRG1 INHIBITOR PFI3 OR VIRAL-MEDIATED OVEREXPRESSION OF BRG1. RESULTS: AFTER WITHDRAWAL FROM COCAINE SELF-ADMINISTRATION, BRG1 EXPRESSION AND COMPLEX FORMATION WITH SMAD3 ARE INCREASED IN THE NUCLEUS ACCUMBENS, RESULTING IN INCREASED BINDING OF BRG1 TO THE PROMOTER REGIONS OF CTNNB1, MEF2D, AND DBN1. INTRA-ACCUMBAL INFUSION OF PFI3 ATTENUATED, WHEREAS VIRAL OVEREXPRESSION OF BRG1 ENHANCED, COCAINE-REINSTATEMENT BEHAVIOR. CONCLUSIONS: BRG1 IS A KEY MEDIATOR OF THE SMAD3-DEPENDENT REGULATION OF CELLULAR AND BEHAVIORAL PLASTICITY THAT MEDIATES COCAINE SEEKING AFTER A PERIOD OF WITHDRAWAL. 2016 14 2750 38 EXPRESSION LEVELS OF THE TYROSINE HYDROXYLASE GENE AND HISTONE MODIFICATIONS AROUND ITS PROMOTER IN THE LOCUS COERULEUS AND VENTRAL TEGMENTAL AREA OF RATS DURING FORCED ABSTINENCE FROM MORPHINE. BACKGROUND: EPIGENETIC MECHANISMS SUCH AS HISTONE MODIFICATIONS MAY BE INVOLVED IN THE STRUCTURAL AND BEHAVIORAL CHANGES ASSOCIATED WITH ADDICTION. WE STUDIED WHETHER MORPHINE-INDUCED CHANGES IN MRNA LEVELS OF THE CATECHOLAMINE BIOSYNTHESIS ENZYME, TYROSINE HYDROXYLASE (TH), ARE ASSOCIATED WITH HISTONE MODIFICATIONS AROUND THE PROMOTER OF THIS GENE IN THE LOCUS COERULEUS (LC) AND VENTRAL TEGMENTAL AREA (VTA) OF RATS. METHODS: DEPENDENCE WAS INDUCED IN RATS BY INTRAPERITONEAL INJECTIONS OF MORPHINE FOR 11 DAYS. THE ANIMALS WERE KILLED 2 H (CHRONIC MORPHINE), 24 H AND 7 DAYS (SPONTANEOUS WITHDRAWAL) AFTER THE LAST INJECTION OF MORPHINE. RESULTS: ANALYSIS OF OUR REAL-TIME QUANTITATIVE REVERSE TRANSCRIPTION PCR RESULTS BY 1-WAY ANOVA SHOWED SIGNIFICANT UPREGULATION (5.13 +/- 0.39 FOLDS) OF LC LEVELS OF THE TH TRANSCRIPT 24 H AFTER THE LAST INJECTION OF MORPHINE TO RATS, WHEN COMPARED WITH 2 H AND 7 DAYS TIME POINTS. CHRONIC MORPHINE AND MORPHINE ABSTINENCE FAILED TO CAUSE ANY SIGNIFICANT CHANGES IN THE LEVELS OF TH MRNA IN THE VTA AFTER CESSATION OF MORPHINE. CONSISTENTLY, CHROMATIN IMMUNOPRECIPITATION REAL-TIME QUANTITATIVE PCR ASSAYS REVEALED THAT 24 H AFTER THE LAST INJECTION OF MORPHINE, LEVELS OF H3 ACETYLATION WERE SIGNIFICANTLY INCREASED (4.12 +/- 0.38 FOLDS) AT THE PROMOTER OF THE TH GENE IN THE LC BUT NOT IN THE VTA. OUR DATA ALSO SHOWED THAT HISTONE H3 TRIMETHYLATION FAILED TO CHANGE AROUND THE TH GENE PROMOTER EITHER IN THE VTA OR IN THE LC AFTER MORPHINE ABSTINENCE. CONCLUSIONS: RESULTS OF THE PRESENT STUDY, FOR THE FIRST TIME, DEMONSTRATE THE INVOLVEMENT OF HISTONE H3 ACETYLATION IN THE REGULATION OF TH GENE EXPRESSION IN THE LC OF RATS DURING FORCED ABSTINENCE FROM MORPHINE. 2018 15 3315 32 HIPPOCAMPAL MU OPIOID RECEPTORS ARE MODULATED FOLLOWING COCAINE SELF-ADMINISTRATION IN RAT. COCAINE ADDICTION IS A COMPLEX PATHOLOGY INDUCED BY LONG-TERM BRAIN CHANGES. UNDERSTANDING THE NEUROCHEMICAL CHANGES UNDERLYING THE REINFORCING EFFECTS OF THIS DRUG OF ABUSE IS CRITICAL FOR REDUCING THE SOCIETAL BURDEN OF DRUG ADDICTION. THE MU OPIOID RECEPTOR PLAYS A MAJOR ROLE IN DRUG REWARD. THIS RECEPTOR IS MODULATED BY CHRONIC COCAINE TREATMENT IN SPECIFIC BRAIN STRUCTURES, BUT FEW STUDIES INVESTIGATED NEUROCHEMICAL ADAPTATIONS INDUCED BY VOLUNTARY COCAINE INTAKE. IN THIS STUDY, WE INVESTIGATED WHETHER INTRAVENOUS COCAINE-SELF ADMINISTRATION (0.33 MG/KG/INJECTION, FIXED-RATIO 1 [FR1], 10 DAYS) IN RATS INDUCES TRANSCRIPTIONAL AND FUNCTIONAL CHANGES OF THE MU OPIOID RECEPTOR IN REWARD-RELATED BRAIN REGIONS. EPIGENETIC PROCESSES WITH HISTONE MODIFICATIONS WERE EXAMINED FOR TWO ACTIVATING MARKS, H3K4ME3, AND H3K27AC. WE FOUND AN INCREASE OF MU OPIOID RECEPTOR GENE EXPRESSION ALONG WITH A POTENTIATION OF ITS FUNCTIONALITY IN HIPPOCAMPUS OF COCAINE SELF-ADMINISTERING ANIMALS COMPARED TO SALINE CONTROLS. CHROMATIN IMMUNOPRECIPITATION FOLLOWED BY QPCR REVEALED NO MODIFICATIONS OF THE HISTONE MARK H3K4ME3 AND H3K27AC LEVELS AT MU OPIOID RECEPTOR PROMOTER. OUR STUDY HIGHLIGHTS THE HIPPOCAMPUS AS AN IMPORTANT TARGET TO FURTHER INVESTIGATE NEUROADAPTIVE PROCESSES LEADING TO COCAINE ADDICTION. 2021 16 5976 23 TET1-DEPENDENT EPIGENETIC MODIFICATION OF BDNF EXPRESSION IN DORSAL HORN NEURONS MEDIATES NEUROPATHIC PAIN IN RATS. TEN-ELEVEN TRANSLOCATION METHYLCYTOSINE DIOXYGENASE 1 (TET1) MEDIATES THE CONVERSION OF 5-METHYLCYTOSINE (5 MC) TO 5-HYDROXYMETHYLCYTOSINE (5 HMC), HENCE PROMOTING DNA DEMETHYLATION. ALTHOUGH RECENT STUDIES HAVE LINKED THE DNA DEMETHYLATION OF SPECIFIC GENES TO PAIN HYPERSENSITIVITY, THE ROLE OF SPINAL TET1-DEPENDENT DNA DEMETHYLATION IN NOCICEPTION HYPERSENSITIVITY DEVELOPMENT REMAINS ELUSIVE. HERE, WE REPORT CORRELATED WITH BEHAVIORAL ALLODYNIA, SPINAL NERVE LIGATION (SNL) UPREGULATED TET1 EXPRESSION IN DORSAL HORN NEURONS THAT HYDROXYLATE 5 MC TO 5 HMC AT CPG DINUCLEOTIDES IN THE BDNF PROMOTER TO PROMOTE SPINAL BDNF EXPRESSION AT DAY 7 AFTER OPERATION. FOCAL KNOCKDOWN OF SPINAL TET1 EXPRESSION DECREASED TET1 BINDING AND 5 HMC ENRICHMENT, FURTHER INCREASED 5 MC ENRICHMENT AT CPG SITES IN THE BDNF PROMOTER AND DECREASED SPINAL BDNF EXPRESSION ACCOMPANIED BY THE ALLEVIATION OF THE DEVELOPED ALLODYNIA. MOREOVER, AT DAY 7 AFTER OPERATION, SNL-ENHANCED TET1 EXPRESSION ALSO INHIBITED THE BINDING OF DNA METHYLTRANSFERASES (DNMTS, I.E., DNMT1, DNMT3A, AND DNMT3B) TO THE BDNF PROMOTER, A REQUIREMENT FOR TRANSCRIPTIONAL SILENCING BY CATALYSING 5-CYTOSINE (5C) TO 5 MC. TOGETHER, THESE DATA SUGGEST AT CPG SITES OF THE BDNF PROMOTER, SNL-ENHANCED TET1 EXPRESSION PROMOTES DNA DEMETHYLATION BOTH BY CONVERTING 5 MC TO 5 HMC AND INHIBITING DNMT BINDING TO REGULATE SPINAL BDNF EXPRESSION, HENCE CONTRIBUTING TO BEHAVIORAL ALLODYNIA DEVELOPMENT. 2016 17 5485 31 REVERSAL OF COCAINE-CONDITIONED PLACE PREFERENCE THROUGH METHYL SUPPLEMENTATION IN MICE: ALTERING GLOBAL DNA METHYLATION IN THE PREFRONTAL CORTEX. ANALYSIS OF GLOBAL METHYLATION IN CELLS HAS REVEALED CORRELATIONS BETWEEN OVERALL DNA METHYLATION STATUS AND SOME BIOLOGICAL STATES. RECENT STUDIES SUGGEST THAT EPIGENETIC REGULATION THROUGH DNA METHYLATION COULD BE RESPONSIBLE FOR NEUROADAPTATIONS INDUCED BY ADDICTIVE DRUGS. HOWEVER, THERE IS NO INVESTIGATION TO DETERMINE GLOBAL DNA METHYLATION STATUS FOLLOWING REPEATED EXPOSURE TO ADDICTIVE DRUGS. USING MICE CONDITIONED PLACE PREFERENCE (CPP) PROCEDURE, WE MEASURED GLOBAL DNA METHYLATION LEVEL IN THE NUCLEUS ACCUMBENS (NAC) AND THE PREFRONTAL CORTEX (PFC) ASSOCIATED WITH DRUG REWARDING EFFECTS. WE FOUND THAT COCAINE-, BUT NOT MORPHINE- OR FOOD-CPP TRAINING DECREASED GLOBAL DNA METHYLATION IN THE PFC. CHRONIC TREATMENT WITH METHIONINE, A METHYL DONOR, FOR 25 CONSECUTIVE DAYS PRIOR TO AND DURING CPP TRAINING INHIBITED THE ESTABLISHMENT OF COCAINE, BUT NOT MORPHINE OR FOOD CPP. WE ALSO FOUND THAT BOTH MRNA AND PROTEIN LEVEL OF DNMT (DNA METHYTRANSFERASE) 3B IN THE PFC WERE DOWNREGULATED FOLLOWING THE ESTABLISHMENT OF COCAINE CPP, AND THE DOWNREGULATION COULD BE REVERSED BY REPEATED ADMINISTRATION OF METHIONINE. OUR STUDY INDICATES A CRUCIAL ROLE OF GLOBAL PFC DNA HYPOMETHYLATION IN THE REWARDING EFFECTS OF COCAINE. REVERSAL OF GLOBAL DNA HYPOMETHYLATION COULD SIGNIFICANTLY ATTENUATE THE REWARDING EFFECTS INDUCED BY COCAINE. OUR RESULTS SUGGEST THAT METHIONINE MAY HAVE BECOME A POTENTIAL THERAPEUTIC TARGET TO TREAT COCAINE ADDICTION. 2012 18 69 30 A MEDIAL PREFRONTAL CORTEX-NUCLEUS ACUMENS CORTICOTROPIN-RELEASING FACTOR CIRCUITRY FOR NEUROPATHIC PAIN-INCREASED SUSCEPTIBILITY TO OPIOID REWARD. RECENT STUDIES HAVE SHOWN THAT PERSISTENT PAIN FACILITATES THE RESPONSE TO MORPHINE REWARD. HOWEVER, THE CIRCUIT MECHANISM UNDERLYING THIS PROCESS REMAINS AMBIGUOUS. IN THIS STUDY, USING CHRONIC CONSTRICTION INJURY (CCI) OF THE SCIATIC NERVE IN MICE, WE FOUND THAT PERSISTENT NEUROPATHIC PAIN REDUCED THE MINIMUM NUMBER OF MORPHINE CONDITIONING SESSIONS REQUIRED TO INDUCE CONDITIONED PLACE PREFERENCE (CPP) BEHAVIOR. THIS DOSE OF MORPHINE HAD NO EFFECT ON THE PAIN THRESHOLD. IN THE MEDIAL PREFRONTAL CORTEX (MPFC), WHICH IS INVOLVED IN BOTH PAIN AND EMOTION PROCESSING, CORTICOTROPIN-RELEASING FACTOR (CRF) EXPRESSING NEURONAL ACTIVITY WAS INCREASED IN CCI MICE. CHEMOGENETIC INHIBITION OF MPFC CRF NEURONS REVERSED CCI-INDUCED MORPHINE CPP FACILITATION. FURTHERMORE, THE NUCLEUS ACUMENS (NAC) RECEIVED MPFC CRF FUNCTIONAL PROJECTIONS THAT EXERTED EXCITATORY EFFECTS ON NAC NEURONS. OPTOGENETIC INHIBITION OF MPCF NEURONAL TERMINALS OR LOCAL INFUSION OF THE CRF RECEPTOR 1 (CRFR1) ANTAGONIST IN THE NAC RESTORED THE EFFECTS OF NEUROPATHIC PAIN ON MORPHINE-INDUCED CPP BEHAVIOR, BUT NOT IN NORMAL MICE. ON A MOLECULAR LEVEL, IN CCI MICE, CRFR1 PROTEIN EXPRESSION WAS INCREASED IN THE NAC BY A HISTONE DIMETHYLTRANSFERASE G9A-MEDIATED EPIGENETIC MECHANISM. LOCAL G9A KNOCKDOWN INCREASED THE EXPRESSION OF CRFR1 AND MIMICKED CCI-INDUCED HYPERSENSITIVITY TO ACQUIRING MORPHINE CPP. TAKEN TOGETHER, THESE FINDINGS DEMONSTRATE A PREVIOUSLY UNKNOWN AND SPECIFIC MPFC CRF ENGAGEMENT OF NAC NEURONAL CIRCUITS, THE SENSITIZATION OF WHICH FACILITATES BEHAVIORAL RESPONSES TO MORPHINE REWARD IN NEUROPATHIC PAIN STATES VIA CRFR1S. 2018 19 1299 27 DECREASED REELIN EXPRESSION IN THE LEFT PREFRONTAL CORTEX (BA9) IN CHRONIC SCHIZOPHRENIA PATIENTS. BACKGROUND: REELIN IS UNDER EPIGENETIC CONTROL AND HAS BEEN REPORTED TO BE DECREASED IN CORTICAL REGIONS IN SCHIZOPHRENIA. METHODS: TO ESTABLISH IF EXPRESSION OF REELIN IS ALTERED IN SPECIFIC CORTICAL, HIPPOCAMPAL OR THALAMIC REGIONS OF SCHIZOPHRENIA PATIENTS, WE MEASURED GENE EXPRESSION OF REELIN IN A POSTMORTEM STUDY OF ELDERLY PATIENTS WITH SCHIZOPHRENIA AND NON-AFFECTED CONTROLS IN BOTH HEMISPHERES DIFFERENTIATING BETWEEN GRAY AND WHITE MATTER. WE COMPARED CEREBRAL POSTMORTEM SAMPLES (DORSOLATERAL PREFRONTAL CORTEX BA9 AND BA46, SUPERIOR TEMPORAL CORTEX BA22, ENTORHINAL CORTEX BA28, SENSORIC CORTEX BA1-3, HIPPOCAMPUS, CA4, MEDIODORSAL NUCLEUS OF THE THALAMUS) FROM 12 SCHIZOPHRENIA PATIENTS WITH 13 NORMAL SUBJECTS INVESTIGATING GENE EXPRESSION OF REELIN IN THE GRAY AND WHITE MATTER OF BOTH HEMISPHERES BY IN SITU-HYBRIDIZATION. RESULTS: THE LEFT PREFRONTAL AREA (BA9) OF SCHIZOPHRENIA PATIENTS REVEALED A DECREASED EXPRESSION OF REELIN-MRNA OF 29.1% IN THE WHITE (P = 0.022) AND 13.6% IN THE GRAY MATTER (P = 0.007) COMPARED TO THE CONTROL GROUP. NONE OF THE OTHER REGIONS EXAMINED SHOWED ANY STATISTICALLY SIGNIFICANT DIFFERENCES. CONCLUSION: SINCE REELIN IS RESPONSIBLE FOR MIGRATION AND SYNAPSE FORMATION, THE DECREASED GENE EXPRESSION OF REELIN IN THE LEFT PREFRONTAL AREA OF SCHIZOPHRENIA PATIENTS POINTS TO NEURODEVELOPMENTAL DEFICITS IN NEURONAL MIGRATION AND SYNAPTIC PLASTICITY. HOWEVER, OUR STUDY GROUP WAS SMALL, AND RESULTS SHOULD BE VERIFIED USING LARGER SAMPLES. 2012 20 882 31 CHRONIC COCAINE-INDUCED H3 ACETYLATION AND TRANSCRIPTIONAL ACTIVATION OF CAMKIIALPHA IN THE NUCLEUS ACCUMBENS IS CRITICAL FOR MOTIVATION FOR DRUG REINFORCEMENT. THE REGULATION OF GENE EXPRESSION IN THE BRAIN REWARD REGIONS IS KNOWN TO CONTRIBUTE TO THE PATHOGENESIS AND PERSISTENCE OF DRUG ADDICTION. INCREASING EVIDENCE SUGGESTS THAT THE REGULATION OF GENE TRANSCRIPTION IS MEDIATED BY EPIGENETIC MECHANISMS THAT ALTER THE CHROMATIN STRUCTURE AT SPECIFIC GENE PROMOTERS. TO BETTER UNDERSTAND THE INVOLVEMENT OF EPIGENETIC REGULATION IN DRUG REINFORCEMENT PROPERTIES, RATS WERE SUBJECTED TO COCAINE SELF-ADMINISTRATION PARADIGM. DAILY HISTONE DEACETYLASE (HDAC) INHIBITOR INFUSIONS IN THE SHELL OF THE NUCLEUS ACCUMBENS (NAC) CAUSED AN UPWARD SHIFT IN THE DOSE-RESPONSE CURVE UNDER FIXED-RATIO SCHEDULE AND INCREASED THE BREAK POINT UNDER PROGRESSIVE-RATIO SCHEDULE, INDICATING ENHANCED MOTIVATION FOR SELF-ADMINISTERED DRUG. THE EFFECT OF THE HDAC INHIBITOR IS ATTRIBUTED TO THE INCREASED ELEVATION OF HISTONE ACETYLATION INDUCED BY CHRONIC, BUT NOT ACUTE, COCAINE EXPERIENCE. IN CONTRAST, NEUTRALIZING THE CHRONIC COCAINE-INDUCED INCREASE IN HISTONE MODIFICATION BY THE BILATERAL OVEREXPRESSION OF HDAC4 IN THE NAC SHELL REDUCED DRUG MOTIVATION. THE ASSOCIATION BETWEEN THE MOTIVATION FOR COCAINE AND THE TRANSCRIPTIONAL ACTIVATION OF ADDICTION-RELATED GENES BY H3 ACETYLATION IN THE NAC SHELL WAS ANALYZED. AMONG THE GENES ACTIVATED BY CHRONIC COCAINE EXPERIENCES, THE EXPRESSION OF CAMKIIALPHA, BUT NOT CAMKIIBETA, CORRELATED POSITIVELY WITH MOTIVATION FOR THE DRUG. LENTIVIRUS-MEDIATED SHRNA KNOCKDOWN EXPERIMENTS SHOWED THAT CAMKIIALPHA, BUT NOT CAMKIIBETA, IN THE NAC SHELL IS ESSENTIAL FOR THE MAINTENANCE OF MOTIVATION TO SELF-ADMINISTERED COCAINE. THESE FINDINGS SUGGEST THAT CHRONIC DRUG-USE-INDUCED TRANSCRIPTIONAL ACTIVATION OF GENES, SUCH AS CAMKIIALPHA, MODULATED BY H3 ACETYLATION IN THE NAC IS A CRITICAL REGULATORY MECHANISM UNDERLYING MOTIVATION FOR DRUG REINFORCEMENT. 2010