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Hitzemann R, Gao L, Fei SS, Ray K, Vigh-Conrad KA, Phillips TJ, Searles R, Cervera-Juanes RP, Khadka R, Carlson TL, Gonzales SW, Newman N, Grant KA. Effects of repeated alcohol abstinence on within-subject prefrontal cortical gene expression in rhesus macaques. ADVANCES IN DRUG AND ALCOHOL RESEARCH 2024; 4:12528. [PMID: 38737578 PMCID: PMC11082748 DOI: 10.3389/adar.2024.12528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 04/12/2024] [Indexed: 05/14/2024]
Abstract
Male rhesus monkeys (n = 24) had a biopsy of prefrontal cortical area 46 prior to chronic ethanol self-administration (n = 17) or caloric control (n = 7). Fourteen months of daily self-administration (water vs. 4% alcohol, 22 h access/day termed "open-access") was followed by two cycles of prolonged abstinence (5 weeks) each followed by 3 months of open-access alcohol and a final abstinence followed by necropsy. At necropsy, a biopsy of Area 46, contralateral to the original biopsy, was obtained. Gene expression data (RNA-Seq) were collected comparing biopsy/necropsy samples. Monkeys were categorized by drinking status during the final post-abstinent drinking phase as light (LD), binge (BD), heavy (HD) and very heavy (VHD drinkers). Comparing pre-ethanol to post-abstinent biopsies, four animals that converted from HD to VHD status had significant ontology enrichments in downregulated genes (necropsy minus biopsy n = 286) that included immune response (FDR < 9 × 10-7) and plasma membrane changes (FDR < 1 × 10-7). Genes in the immune response category included IL16 and 18, CCR1, B2M, TLR3, 6 and 7, SP2 and CX3CR1. Upregulated genes (N = 388) were particularly enriched in genes associated with the negative regulation of MAP kinase activity (FDR < 3 × 10-5), including DUSP 1, 4, 5, 6 and 18, SPRY 2, 3, and 4, SPRED2, BMP4 and RGS2. Overall, these data illustrate the power of the NHP model and the within-subject design of genomic changes due to alcohol and suggest new targets for treating severe escalated drinking following repeated alcohol abstinence attempts.
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Affiliation(s)
- Robert Hitzemann
- Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR, United States
- Portland Alcohol Research Center, Oregon Health and Science University, Portland, OR, United States
- Veterans Affairs Portland Health Care System, Portland, OR, United States
| | - Lina Gao
- Portland Alcohol Research Center, Oregon Health and Science University, Portland, OR, United States
- Bioinformatics and Biostatistics Core, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, United States
| | - Suzanne S. Fei
- Portland Alcohol Research Center, Oregon Health and Science University, Portland, OR, United States
- Bioinformatics and Biostatistics Core, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, United States
| | - Karina Ray
- Bioinformatics and Biostatistics Core, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, United States
| | - Katinka A. Vigh-Conrad
- Division of Genetics, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, United States
| | - Tamara J. Phillips
- Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR, United States
- Portland Alcohol Research Center, Oregon Health and Science University, Portland, OR, United States
- Veterans Affairs Portland Health Care System, Portland, OR, United States
| | - Robert Searles
- Portland Alcohol Research Center, Oregon Health and Science University, Portland, OR, United States
- Integrated Genomics Laboratory, Oregon Health and Science University, Portland, OR, United States
| | - Rita P. Cervera-Juanes
- Division of Neuroscience, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, United States
| | - Rupak Khadka
- Division of Neuroscience, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, United States
| | - Timothy L. Carlson
- Division of Neuroscience, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, United States
| | - Steven W. Gonzales
- Division of Neuroscience, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, United States
| | - Natali Newman
- Division of Neuroscience, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, United States
| | - Kathleen A. Grant
- Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR, United States
- Portland Alcohol Research Center, Oregon Health and Science University, Portland, OR, United States
- Division of Neuroscience, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, United States
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2
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Kaplan G, Xu H, Abreu K, Feng J. DNA Epigenetics in Addiction Susceptibility. Front Genet 2022; 13:806685. [PMID: 35145550 PMCID: PMC8821887 DOI: 10.3389/fgene.2022.806685] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 01/06/2022] [Indexed: 12/22/2022] Open
Abstract
Addiction is a chronically relapsing neuropsychiatric disease that occurs in some, but not all, individuals who use substances of abuse. Relatively little is known about the mechanisms which contribute to individual differences in susceptibility to addiction. Neural gene expression regulation underlies the pathogenesis of addiction, which is mediated by epigenetic mechanisms, such as DNA modifications. A growing body of work has demonstrated distinct DNA epigenetic signatures in brain reward regions that may be associated with addiction susceptibility. Furthermore, factors that influence addiction susceptibility are also known to have a DNA epigenetic basis. In the present review, we discuss the notion that addiction susceptibility has an underlying DNA epigenetic basis. We focus on major phenotypes of addiction susceptibility and review evidence of cell type-specific, time dependent, and sex biased effects of drug use. We highlight the role of DNA epigenetics in these diverse processes and propose its contribution to addiction susceptibility differences. Given the prevalence and lack of effective treatments for addiction, elucidating the DNA epigenetic mechanism of addiction vulnerability may represent an expeditious approach to relieving the addiction disease burden.
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3
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Histone Methylation Regulation in Neurodegenerative Disorders. Int J Mol Sci 2021; 22:ijms22094654. [PMID: 33925016 PMCID: PMC8125694 DOI: 10.3390/ijms22094654] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 04/21/2021] [Accepted: 04/23/2021] [Indexed: 12/11/2022] Open
Abstract
Advances achieved with molecular biology and genomics technologies have permitted investigators to discover epigenetic mechanisms, such as DNA methylation and histone posttranslational modifications, which are critical for gene expression in almost all tissues and in brain health and disease. These advances have influenced much interest in understanding the dysregulation of epigenetic mechanisms in neurodegenerative disorders. Although these disorders diverge in their fundamental causes and pathophysiology, several involve the dysregulation of histone methylation-mediated gene expression. Interestingly, epigenetic remodeling via histone methylation in specific brain regions has been suggested to play a critical function in the neurobiology of psychiatric disorders, including that related to neurodegenerative diseases. Prominently, epigenetic dysregulation currently brings considerable interest as an essential player in neurodegenerative disorders, such as Alzheimer's disease (AD), Parkinson's disease (PD), Huntington's disease (HD), Amyotrophic lateral sclerosis (ALS) and drugs of abuse, including alcohol abuse disorder, where it may facilitate connections between genetic and environmental risk factors or directly influence disease-specific pathological factors. We have discussed the current state of histone methylation, therapeutic strategies, and future perspectives for these disorders. While not somatically heritable, the enzymes responsible for histone methylation regulation, such as histone methyltransferases and demethylases in neurons, are dynamic and reversible. They have become promising potential therapeutic targets to treat or prevent several neurodegenerative disorders. These findings, along with clinical data, may provide links between molecular-level changes and behavioral differences and provide novel avenues through which the epigenome may be targeted early on in people at risk for neurodegenerative disorders.
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Banu S, Srivastava S, Mohammed A, Kushawah G, Sowpati DT, Mishra RK. Tissue-specific transcriptome recovery on withdrawal from chronic alcohol exposure in zebrafish. Alcohol 2021; 91:29-38. [PMID: 33038458 DOI: 10.1016/j.alcohol.2020.10.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Revised: 09/28/2020] [Accepted: 10/01/2020] [Indexed: 12/16/2022]
Abstract
Alcohol consumption can lead to a wide range of systemic disorders brought about by transcriptional changes. Recent studies have documented altered behavior and physiology in zebrafish exposed to alcohol. In this work, we have identified the changes in the zebrafish transcriptome in response to chronic alcohol exposure. We have further followed the extent of transcriptional recovery upon withdrawal from alcohol and found evidence of tissue-specific responses. Our results indicate a greater extent of recovery of the brain transcriptome compared to the liver. We identify two distinct classes of genes in response to withdrawal from alcohol exposure - those that recover their pre-alcohol expression profile versus those that retain altered expression even after the fish are removed from the alcohol environment. Finally, we have examined gender-specific responses to alcohol exposure in zebrafish and find evidence for distinct alcohol tolerance levels. Upon chronic alcohol exposure, a higher percentage of genes show perturbation in expression profile in males compared to females. Female fish also recover better with more genes regaining the control expression level upon withdrawal from alcohol. Overall, our work identifies genes and pathways perturbed by exposure to alcohol, and demonstrates the extent of gender- and tissue-specific transcriptional changes associated with chronic alcoholism and withdrawal.
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5
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Bohnsack JP, Pandey SC. Histone modifications, DNA methylation, and the epigenetic code of alcohol use disorder. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2020; 156:1-62. [PMID: 33461661 DOI: 10.1016/bs.irn.2020.08.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Alcohol use disorder (AUD) is a leading cause of morbidity and mortality. Despite AUD's substantial contributions to lost economic productivity and quality of life, there are only a limited number of approved drugs for treatment of AUD in the United States. This chapter will update progress made on the epigenetic basis of AUD, with particular focus on histone post-translational modifications and DNA methylation and how these two epigenetic mechanisms interact to contribute to neuroadaptive processes leading to initiation, maintenance and progression of AUD pathophysiology. We will also evaluate epigenetic therapeutic strategies that have arisen from preclinical models of AUD and epigenetic biomarkers that have been discovered in human populations with AUD.
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Affiliation(s)
- John Peyton Bohnsack
- Center for Alcohol Research in Epigenetics, Department of Psychiatry, College of Medicine, University of Illinois at Chicago, Chicago, IL, United States
| | - Subhash C Pandey
- Center for Alcohol Research in Epigenetics, Department of Psychiatry, College of Medicine, University of Illinois at Chicago, Chicago, IL, United States; Jesse Brown VA Medical Center, Chicago, IL, United States; Department of Anatomy and Cell Biology, University of Illinois at Chicago, Chicago, IL, United States.
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6
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Schaffner SL, Lussier AA, Baker JA, Goldowitz D, Hamre KM, Kobor MS. Neonatal Alcohol Exposure in Mice Induces Select Differentiation- and Apoptosis-Related Chromatin Changes Both Independent of and Dependent on Sex. Front Genet 2020; 11:35. [PMID: 32117449 PMCID: PMC7026456 DOI: 10.3389/fgene.2020.00035] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Accepted: 01/13/2020] [Indexed: 01/08/2023] Open
Abstract
Prenatal alcohol exposure (PAE) affects many aspects of physiology and behavior, including brain development. Specifically, ethanol can influence expression of genes important for brain growth, including chromatin modifiers. Ethanol can also increase apoptotic cell death in the brain and alter epigenetic profiles such as modifications to histones and DNA methylation. Although differential sex outcomes and disruptions to the function of multiple brain regions have been reported in fetal alcohol spectrum disorder (FASD), the majority of our knowledge on molecular epigenetic and apoptotic dysregulation in PAE is based on data from males and is sometimes limited to assessments of the whole brain or one brain region. Here, we examined histone modifications, DNA methylation, and expression of genes involved in differentiation and proliferation related-chromatin modifications and apoptosis in the cerebral cortex and cerebellum of C57BL/6J mice exposed to an acute alcohol challenge on postnatal day 7, with a focus on differential outcomes between sexes and brain regions. We found that neonatal alcohol exposure altered histone modifications, and impacted expression of a select few chromatin modifier and apoptotic genes in both the cortex and cerebellum. The results were observed primarily in a sex-independent manner, although some additional trends toward sexual dimorphisms were observed. Alcohol exposure induced trends toward increased bulk H3K4me3 levels, increased Kmt2e expression, and elevated levels of Casp6 mRNA and bulk γH2A.X. Additional trends indicated that ethanol may impact Kdm4a promoter DNA methylation levels and bulk levels of the histone variant H2A.Z, although further studies are needed. We comprehensively examined effects of ethanol exposure across different sexes and brain regions, and our results suggest that major impacts of ethanol on bulk chromatin modifications underlying differentiation and apoptosis may be broadly applicable across the rodent cortex and cerebellum in both sexes.
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Affiliation(s)
- Samantha L. Schaffner
- Centre for Molecular Medicine and Therapeutics, British Columbia Children’s Hospital Research Institute – Department of Medical Genetics, University of British Columbia, Vancouver, BC, Canada
| | - Alexandre A. Lussier
- Centre for Molecular Medicine and Therapeutics, British Columbia Children’s Hospital Research Institute – Department of Medical Genetics, University of British Columbia, Vancouver, BC, Canada
| | - Jessica A. Baker
- Department of Anatomy and Neurobiology, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Dan Goldowitz
- Centre for Molecular Medicine and Therapeutics, British Columbia Children’s Hospital Research Institute – Department of Medical Genetics, University of British Columbia, Vancouver, BC, Canada
| | - Kristin M. Hamre
- Department of Anatomy and Neurobiology, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Michael S. Kobor
- Centre for Molecular Medicine and Therapeutics, British Columbia Children’s Hospital Research Institute – Department of Medical Genetics, University of British Columbia, Vancouver, BC, Canada
- Human Early Learning Partnership, School of Population and Public Health, University of British Columbia, Vancouver, BC, Canada
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7
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Hartmann MC, Holbrook SE, Haney MM, Crabbe JC, Rosenwasser AM. Affective Behavior in Withdrawal Seizure-Prone and Withdrawal Seizure-Resistant Mice during Long-Term Alcohol Abstinence. Alcohol Clin Exp Res 2019; 43:1478-1485. [PMID: 31046129 DOI: 10.1111/acer.14074] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2019] [Accepted: 04/24/2019] [Indexed: 01/16/2023]
Abstract
BACKGROUND While the acute alcohol withdrawal syndrome has been well characterized both in human clinical studies and in experimental animals, much less is known regarding long-term affective disturbances that can sometimes persist during protracted abstinence. Nevertheless, since relapse often occurs long after acute detoxification and may be predicted by persistent affective disruption, a better understanding of the long-term behavioral consequences of prior alcohol dependence may lead to improved strategies for relapse prevention. METHODS Male and female Withdrawal Seizure-Prone and Withdrawal Seizure-Resistant mice from the second selection replicate (WSP-2, WSR-2) were exposed to a 10-day chronic-intermittent ethanol vapor protocol (CIE) or plain air and then tested repeatedly on the sucrose preference test (SPT), marble burying test (MBT), and the light-dark box test (LDT) over 7 weeks of (forced) abstinence. RESULTS While WSP and WSR mice differed significantly on tests of anxiety-like behavior (LDT, MBT), we found little evidence for long-term affective disruption following CIE in either line. The major exception was in the LDT, in that WSP but not WSR mice displayed longer latencies to enter the light compartment following CIE relative to air-controls. CONCLUSIONS Selective breeding for acute withdrawal severity has resulted in differences in anxiety-like behavior between WSP and WSR mice. In contrast, however, genes contributing to the severity of acute withdrawal convulsions appear to have little overlap with those predisposing to affective disruption during long-term abstinence.
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Affiliation(s)
- Matthew C Hartmann
- Graduate School of Biomedical Science and Engineering, University of Maine, Orono, Maine.,Department of Psychology, University of Maine, Orono, Maine
| | - Sarah E Holbrook
- School of Biology and Ecology, University of Maine, Orono, Maine
| | - Megan M Haney
- Department of Psychology, University of Maine, Orono, Maine
| | - John C Crabbe
- Portland Alcohol Research Center, VA Portland Health Care System, Portland, Oregon.,Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, Oregon
| | - Alan M Rosenwasser
- Graduate School of Biomedical Science and Engineering, University of Maine, Orono, Maine.,Department of Psychology, University of Maine, Orono, Maine.,School of Biology and Ecology, University of Maine, Orono, Maine
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8
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Finn DA, Hashimoto JG, Cozzoli DK, Helms ML, Nipper MA, Kaufman MN, Wiren KM, Guizzetti M. Binge Ethanol Drinking Produces Sexually Divergent and Distinct Changes in Nucleus Accumbens Signaling Cascades and Pathways in Adult C57BL/6J Mice. Front Genet 2018; 9:325. [PMID: 30250478 PMCID: PMC6139464 DOI: 10.3389/fgene.2018.00325] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 07/30/2018] [Indexed: 12/20/2022] Open
Abstract
We previously determined that repeated binge ethanol drinking produced sex differences in the regulation of signaling downstream of Group 1 metabotropic glutamate receptors in the nucleus accumbens (NAc) of adult C57BL/6J mice. The purpose of the present study was to characterize RNA expression differences in the NAc of adult male and female C57BL/6J mice following 7 binge ethanol drinking sessions, when compared with controls consuming water. This binge drinking procedure produced high intakes (average >2.2 g/kg/30 min) and blood ethanol concentrations (average >1.3 mg/ml). Mice were euthanized at 24 h after the 7th binge session, and focused qPCR array analysis was employed on NAc tissue to quantify expression levels of 384 genes in a customized Mouse Mood Disorder array, with a focus on glutamatergic signaling (3 arrays/group). We identified significant regulation of 50 genes in male mice and 70 genes in female mice after 7 ethanol binges. Notably, 14 genes were regulated in both males and females, representing common targets to binge ethanol drinking. However, expression of 10 of these 14 genes was strongly dimorphic (e.g., opposite regulation for genes such as Crhr2, Fos, Nos1, and Star), and only 4 of the 14 genes were regulated in the same direction (Drd5, Grm4, Ranbp9, and Reln). Interestingly, the top 30 regulated genes by binge ethanol drinking for each sex differed markedly in the male and female mice, and this divergent neuroadaptive response in the NAc could result in dysregulation of distinct biological pathways between the sexes. Characterization of the expression differences with Ingenuity Pathway Analysis was used to identify Canonical Pathways, Upstream Regulators, and significant Biological Functions. Expression differences suggested that hormone signaling and immune function were altered by binge drinking in female mice, whereas neurotransmitter metabolism was a central target of binge ethanol drinking in male mice. Thus, these results indicate that the transcriptional response to repeated binge ethanol drinking was strongly influenced by sex, and they emphasize the importance of considering sex in the development of potential pharmacotherapeutic targets for the treatment of alcohol use disorder.
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Affiliation(s)
- Deborah A Finn
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States.,Research, VA Portland Health Care System, Portland, OR, United States
| | - Joel G Hashimoto
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States.,Research, VA Portland Health Care System, Portland, OR, United States
| | - Debra K Cozzoli
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States
| | - Melinda L Helms
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States.,Research, VA Portland Health Care System, Portland, OR, United States
| | - Michelle A Nipper
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States.,Research, VA Portland Health Care System, Portland, OR, United States
| | - Moriah N Kaufman
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States
| | - Kristine M Wiren
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States.,Research, VA Portland Health Care System, Portland, OR, United States
| | - Marina Guizzetti
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States.,Research, VA Portland Health Care System, Portland, OR, United States
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9
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You C, Vandegrift BJ, Zhang H, Lasek AW, Pandey SC, Brodie MS. Histone Deacetylase Inhibitor Suberanilohydroxamic Acid Treatment Reverses Hyposensitivity to γ-Aminobutyric Acid in the Ventral Tegmental Area During Ethanol Withdrawal. Alcohol Clin Exp Res 2018; 42:2160-2171. [PMID: 30103280 PMCID: PMC6214766 DOI: 10.1111/acer.13870] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 08/08/2018] [Indexed: 12/24/2022]
Abstract
Background The ventral tegmental area (VTA) is important for alcohol‐related reward and reinforcement. Mouse VTA neurons are hyposensitive to γ‐aminobutyric acid (GABA) during ethanol (EtOH) withdrawal, and GABA responsiveness is normalized by in vitro treatment with histone deacetylase inhibitors (HDACi). The present study examined the effect of a systemically administered HDACi, suberanilohydroxamic acid (SAHA) on GABA sensitivity, and related molecular changes in VTA neurons during withdrawal after chronic EtOH intake in rats. Methods Sprague Dawley male adult rats were fed with Lieber‐DeCarli diet (9% EtOH or control diet) for 16 days. Experimental groups included control diet‐fed and EtOH diet‐fed (0‐ or 24‐hour withdrawal) rats treated with either SAHA or vehicle injection. Single‐unit recordings were used to measure the response of VTA neurons to GABA. Immunohistochemistry was performed to examine levels of HDAC2, acetylated histone H3 lysine 9 (acH3K9), and GABAA receptor α1 and α5 subunits in the VTA; quantitative polymerase chain reaction was performed to examine the mRNA levels of HDAC2 and GABAA receptor subunits. Results VTA neurons from the withdrawal group exhibited GABA hyposensitivity. In vivo SAHA treatment 2 hours before sacrifice normalized the sensitivity of VTA neurons to GABA. EtOH withdrawal was associated with increased HDAC2 and decreased acH3K9 protein levels; SAHA treatment normalized acH3K9 levels. Interestingly, no significant change was observed in the mRNA levels of HDAC2. The mRNA levels, but not protein levels, of GABAA receptor α1 and α5 subunits were increased during withdrawal. Conclusions Withdrawal from chronic EtOH exposure results in a decrease in GABA‐mediated inhibition, and this GABA hyposensitivity is normalized by in vivo SAHA treatment. Disruption of signaling in the VTA produced by alteration of GABA neurotransmission could be 1 neuroadaptive physiological process leading to craving and relapse. These results suggest that HDACi pharmacotherapy with agents like SAHA might be an effective treatment for alcoholism.
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Affiliation(s)
- Chang You
- Department of Physiology and Biophysics , University of Illinois at Chicago, Chicago, Illinois.,Center for Alcohol Research in Epigenetics , Department of Psychiatry, University of Illinois at Chicago, Chicago, Illinois
| | - Bertha J Vandegrift
- Department of Physiology and Biophysics , University of Illinois at Chicago, Chicago, Illinois.,Center for Alcohol Research in Epigenetics , Department of Psychiatry, University of Illinois at Chicago, Chicago, Illinois
| | - Huaibo Zhang
- Center for Alcohol Research in Epigenetics , Department of Psychiatry, University of Illinois at Chicago, Chicago, Illinois.,Jesse Brown VA Medical Center , Chicago, Illinois
| | - Amy W Lasek
- Center for Alcohol Research in Epigenetics , Department of Psychiatry, University of Illinois at Chicago, Chicago, Illinois
| | - Subhash C Pandey
- Center for Alcohol Research in Epigenetics , Department of Psychiatry, University of Illinois at Chicago, Chicago, Illinois.,Jesse Brown VA Medical Center , Chicago, Illinois
| | - Mark S Brodie
- Department of Physiology and Biophysics , University of Illinois at Chicago, Chicago, Illinois.,Center for Alcohol Research in Epigenetics , Department of Psychiatry, University of Illinois at Chicago, Chicago, Illinois
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10
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Gavin DP, Hashimoto JG, Lazar NH, Carbone L, Crabbe JC, Guizzetti M. Stable Histone Methylation Changes at Proteoglycan Network Genes Following Ethanol Exposure. Front Genet 2018; 9:346. [PMID: 30214456 PMCID: PMC6125400 DOI: 10.3389/fgene.2018.00346] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 08/09/2018] [Indexed: 12/14/2022] Open
Abstract
Alcohol use disorder (AUD) is a chronic mental illness in which patients often achieve protracted periods of abstinence prior to relapse. Epigenetic mechanisms may provide an explanation for the persisting gene expression changes that can be observed even after long periods of abstinence and may contribute to relapse. In this study, we examined two histone modifications, histone 3 lysine 4 tri-methylation (H3K4me3) and histone 3 lysine 27 tri-methylation (H3K27me3), in the prefrontal cortex of Withdrawal Seizure Resistant (WSR) mice 21 days after 72 h of ethanol vapor exposure. These histone modifications were selected because they are associated with active promoters (H3K4me3) and repressed gene expression in a euchromatic environment (H3K27me3). We performed a genome-wide analysis to identify differences in H3K4me3 and H3K27me3 levels in post-ethanol exposure vs. control mice by ChIP-seq. We detected a global reduction in H3K4me3 peaks and increase in H3K27me3 peaks in post-ethanol exposure mice compared to controls, these changes are consistent with persistent reductions in gene expression. Pathway analysis of genes displaying changes in H3K4me3 and H3K27me3 revealed enrichment for genes involved in proteoglycan and calcium signaling pathways, respectively. Microarray analysis of 7,683 genes and qPCR analysis identified eight genes displaying concordant regulation of gene expression and H3K4me3/H3K27me3. We also compared changes in H3K4me3 and/or H3K27me3 from our study with changes in gene expression in response to ethanol from published literature and we found that the expression of 52% of the genes with altered H3K4me3 binding and 40% of genes with H3K27me3 differences are altered by ethanol exposure. The chromatin changes associated with the 21-day post-exposure period suggest that this period is a unique state in the addiction cycle that differs from ethanol intoxication and acute withdrawal. These results provide insights into the enduring effects of ethanol on proteoglycan and calcium signaling genes in the brain.
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Affiliation(s)
- David P. Gavin
- Jesse Brown Veterans Affairs Medical Center, Chicago, IL, United States
- Department of Psychiatry, Center for Alcohol Research in Epigenetics, University of Illinois at Chicago, Chicago, IL, United States
| | - Joel G. Hashimoto
- Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR, United States
- VA Portland Health Care System, Portland, OR, United States
| | - Nathan H. Lazar
- Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR, United States
| | - Lucia Carbone
- Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR, United States
| | - John C. Crabbe
- Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR, United States
- VA Portland Health Care System, Portland, OR, United States
| | - Marina Guizzetti
- Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR, United States
- VA Portland Health Care System, Portland, OR, United States
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11
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Mahnke AH, Miranda RC, Homanics GE. Epigenetic mediators and consequences of excessive alcohol consumption. Alcohol 2017; 60:1-6. [PMID: 28395929 PMCID: PMC5439216 DOI: 10.1016/j.alcohol.2017.02.357] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 02/27/2017] [Indexed: 12/20/2022]
Affiliation(s)
- Amanda H Mahnke
- Department of Neuroscience and Experimental Therapeutics, College of Medicine, Texas A&M University Health Science Center, Bryan, TX, United States.
| | - Rajesh C Miranda
- Department of Neuroscience and Experimental Therapeutics, College of Medicine, Texas A&M University Health Science Center, Bryan, TX, United States
| | - Gregg E Homanics
- Department of Anesthesiology, University of Pittsburgh, Pittsburgh, PA, United States; Department of Neurobiology, University of Pittsburgh, Pittsburgh, PA, United States; Department of Pharmacology & Chemical Biology, University of Pittsburgh, Pittsburgh, PA, United States
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