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Ebrahimi G, Asadikaram G, Akbari H, Nematollahi MH, Abolhassani M, Shahabinejad G, Khodadadnejad L, Hashemi M. Elevated levels of DNA methylation at the OPRM1 promoter region in men with opioid use disorder. THE AMERICAN JOURNAL OF DRUG AND ALCOHOL ABUSE 2017; 44:193-199. [DOI: 10.1080/00952990.2016.1275659] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Ghasem Ebrahimi
- Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
- Department of Biochemistry, School of Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | - Gholamreza Asadikaram
- Endocrinology and Metabolism Research Center, Institute of Basic and Clinical Physiology Sciences, Kerman University of Medical Sciences, Kerman, Iran
- Department of Biochemistry, School of Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | - Hamed Akbari
- Endocrinology and Metabolism Research Center, Institute of Basic and Clinical Physiology Sciences, Kerman University of Medical Sciences, Kerman, Iran
- Department of Biochemistry, School of Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | | | - Moslem Abolhassani
- Department of Biochemistry, School of Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | - Gholamabbas Shahabinejad
- Department of Biochemistry, School of Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | - Leyla Khodadadnejad
- Physiology Research Center, Institute of Basic and Clinical Physiology Sciences, Kerman University of Medical Sciences, Kerman, Iran
| | - Mohammad Hashemi
- Department of Clinical Biochemistry, School of Medicine, Zahedan University of Medical Sciences. Zahedan, Iran
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Shakiba M, Hashemi M, Rahbari Z, Mahdar S, Danesh H, Bizhani F, Bahari G. Lack of Association between Human µ-Opioid Receptor (<em>OPRM1</em>) Gene Polymorphisms and Heroin Addiction in A Sample of Southeast Iranian Population. AIMS MEDICAL SCIENCE 2017. [DOI: 10.3934/medsci.2017.2.233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Cole FS, Wegner DJ, Davis JM. The Genomics of Neonatal Abstinence Syndrome. Front Pediatr 2017; 5:176. [PMID: 28879171 PMCID: PMC5572235 DOI: 10.3389/fped.2017.00176] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Accepted: 07/31/2017] [Indexed: 11/28/2022] Open
Abstract
Significant variability has been observed in the development and severity of neonatal abstinence syndrome (NAS) among neonates exposed to prenatal opioids. Since maternal opioid dose does not appear to correlate directly with neonatal outcome, maternal, placental, and fetal genomic variants may play important roles in NAS. Previous studies in small cohorts have demonstrated associations of variants in maternal and infant genes that encode the μ-opioid receptor (OPRM1), catechol-O-methyltransferase (COMT), and prepronociceptin (PNOC) with a shorter length of hospital stay and less need for treatment in neonates exposed to opioids in utero. Consistently falling genomic sequencing costs and computational approaches to predict variant function will permit unbiased discovery of genomic variants and gene pathways associated with differences in maternal and fetal opioid pharmacokinetics and pharmacodynamics and with placental opioid transport and metabolism. Discovery of pathogenic variants should permit better delineation of the risk of developing more severe forms of NAS. This review provides a summary of the current role of genomic factors in the development of NAS and suggests strategies for further genomic discovery.
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Affiliation(s)
- F Sessions Cole
- The Edward Mallinckrodt Department of Pediatrics, Division of Newborn Medicine, Washington University School of Medicine, St. Louis Children's Hospital, St. Louis, MO, United States
| | - Daniel J Wegner
- The Edward Mallinckrodt Department of Pediatrics, Division of Newborn Medicine, Washington University School of Medicine, St. Louis Children's Hospital, St. Louis, MO, United States
| | - Jonathan M Davis
- The Department of Pediatrics, Division of Newborn Medicine, The Floating Hospital for Children at Tufts Medical Center, The Clinical and Translational Science Institute, Tufts University, Boston, MA, United States
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Caputi FF, Palmisano M, Carboni L, Candeletti S, Romualdi P. Opioid gene expression changes and post-translational histone modifications at promoter regions in the rat nucleus accumbens after acute and repeated 3,4-methylenedioxy-methamphetamine (MDMA) exposure. Pharmacol Res 2016; 114:209-218. [PMID: 27989838 DOI: 10.1016/j.phrs.2016.10.023] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 07/29/2016] [Accepted: 10/28/2016] [Indexed: 01/06/2023]
Abstract
The recreational drug of abuse 3,4-methylenedioxymethamphetamine (MDMA) has been shown to produce neurotoxic damage and long-lasting changes in several brain areas. In addition to the involvement of serotoninergic and dopaminergic systems, little information exists about the contribution of nociceptin/orphaninFQ (N/OFQ)-NOP and dynorphin (DYN)-KOP systems in neuronal adaptations evoked by MDMA. Here we investigated the behavioral and molecular effects induced by acute (8mg/kg) or repeated (8mg/kg twice daily for seven days) MDMA exposure. MDMA exposure affected body weight gain and induced hyperlocomotion; this latter effect progressively decreased after repeated administration. Gene expression analysis indicated a down-regulation of the N/OFQ system and an up-regulation of the DYN system in the nucleus accumbens (NAc), highlighting an opposite systems regulation in response to MDMA exposure. Since histone modifications have been strongly associated to the addiction-related maladaptive changes, we examined two permissive (acH3K9 and me3H3K4) and two repressive transcription marks (me3H3K27 and me2H3K9) at the pertinent opioid gene promoter regions. Chromatin immunoprecipitation assays revealed that acute MDMA increased me3H3K4 at the pN/OFQ, pDYN and NOP promoters. Following acute and repeated treatment a significant decrease of acH3K9 at the pN/OFQ promoter was observed, which correlated with gene expression results. Acute treatment caused an acH3K9 increase and a me2H3K9 decrease at the pDYN promoter which matched its mRNA up-regulation. Our data indicate that the activation of the DYNergic stress system together with the inactivation of the N/OFQergic anti-stress system contribute to the neuroadaptive actions of MDMA and offer novel epigenetic information associated with MDMA abuse.
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Affiliation(s)
- Francesca Felicia Caputi
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum - University of Bologna, Irnerio 48, 40126 Bologna, Italy
| | - Martina Palmisano
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum - University of Bologna, Irnerio 48, 40126 Bologna, Italy
| | - Lucia Carboni
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum - University of Bologna, Irnerio 48, 40126 Bologna, Italy
| | - Sanzio Candeletti
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum - University of Bologna, Irnerio 48, 40126 Bologna, Italy
| | - Patrizia Romualdi
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum - University of Bologna, Irnerio 48, 40126 Bologna, Italy.
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Xu L, Hong Q, Chen X, Xu X, Liu H, Zhou W, Duan S. H4K5 histone acetylation of BRG1 is associated with heroin administration rather than addiction. Exp Ther Med 2016; 12:1929-1933. [PMID: 27588112 DOI: 10.3892/etm.2016.3517] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Accepted: 05/19/2016] [Indexed: 11/06/2022] Open
Abstract
Diacetylmorphine hydrochloride (heroin) addiction is a chronic relapsing brain disorder that is a heavy public health burden worldwide. Brm/SWI2-related gene-1 (BRG1) is a tumor suppressor gene that can influence embryogenesis and the development of the cerebellum. The current study aimed to investigate the effect of histone H4 lysine 5 (H4K5) modifications on the BRG1 gene in brain tissue of the ventral tegmental area (VTA) of heroin-addicted rats. A total of 21 male Sprague Dawley rats were raised in a standard manner and underwent heroin self-administration training. Rats were randomly divided into three equal groups: Group A, self-administered delivery of heroin; group B, yoked delivery of heroin; and group C, yoked delivery of saline. The VTA was harvested and subjected to chromatin immunoprecipitation (ChIP) analysis. Gene expression was evaluated by quantitative polymerase chain reaction. We calculated the recovery rate, which indicated the percentage of the total input BRG1 recovered by ChIP. Our results showed that BRG1 was less associated with H4K5 histone modification in the group of rats that underwent heroin self-administration than in the other two groups (A vs. B, P=0.031; A vs. C, P=0.067). The recovery fold changes of the self-administration group and the passive-administration group were significantly different from those of the group with yoked saline (A vs. C, P=0.013; B vs. C, P=0.009; A vs. B, P=0.731). The results of the current study demonstrated that H4K5 histone acetylation of BRG1 in the VTA may be associated with heroin administration, but not addiction.
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Affiliation(s)
- Limin Xu
- Zhejiang Provincial Key Laboratory of Pathophysiology, Ningbo University School of Medicine, Ningbo, Zhejiang 315211, P.R. China; Huzhou Key Laboratory of Molecular Medicine, Huzhou Central Hospital, Huzhou, Zhejiang 313000, P.R. China
| | - Qingxiao Hong
- Zhejiang Provincial Key Laboratory of Pathophysiology, Ningbo University School of Medicine, Ningbo, Zhejiang 315211, P.R. China
| | - Xiaoying Chen
- Zhejiang Provincial Key Laboratory of Pathophysiology, Ningbo University School of Medicine, Ningbo, Zhejiang 315211, P.R. China
| | - Xuting Xu
- Zhejiang Provincial Key Laboratory of Pathophysiology, Ningbo University School of Medicine, Ningbo, Zhejiang 315211, P.R. China
| | - Huifen Liu
- Laboratory of Behavioral Neuroscience, Ningbo University, Ningbo, Zhejiang 315010, P.R. China; Ningbo Institute of Microcirculation and Henbane, Ningbo, Zhejiang 315010, P.R. China
| | - Wenhua Zhou
- Zhejiang Provincial Key Laboratory of Pathophysiology, Ningbo University School of Medicine, Ningbo, Zhejiang 315211, P.R. China; Laboratory of Behavioral Neuroscience, Ningbo University, Ningbo, Zhejiang 315010, P.R. China; Ningbo Institute of Microcirculation and Henbane, Ningbo, Zhejiang 315010, P.R. China
| | - Shiwei Duan
- Zhejiang Provincial Key Laboratory of Pathophysiology, Ningbo University School of Medicine, Ningbo, Zhejiang 315211, P.R. China
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Manning M, Wong GTW, Ransley J, Smith C. Analysing pseudoephedrine/methamphetamine policy options in Australia using multi-criteria decision modelling. THE INTERNATIONAL JOURNAL OF DRUG POLICY 2016; 32:85-92. [PMID: 27179610 DOI: 10.1016/j.drugpo.2016.03.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 03/21/2016] [Accepted: 03/23/2016] [Indexed: 11/15/2022]
Abstract
BACKGROUND In this paper we capture and synthesize the unique knowledge of experts so that choices regarding policy measures to address methamphetamine consumption and dependency in Australia can be strengthened. We examine perceptions of the: (1) influence of underlying factors that impact on the methamphetamine problem; (2) importance of various models of intervention that have the potential to affect the success of policies; and (3) efficacy of alternative pseudoephedrine policy options. METHODS We adopt a multi-criteria decision model to unpack factors that affect decisions made by experts and examine potential variations on weight/preference among groups. Seventy experts from five groups (i.e. academia (18.6%), government and policy (27.1%), health (18.6%), pharmaceutical (17.1%) and police (18.6%)) in Australia participated in the survey. RESULTS Social characteristics are considered the most important underlying factor, prevention the most effective strategy and Project STOP the most preferred policy option with respect to reducing methamphetamine consumption and dependency in Australia. One-way repeated ANOVAs indicate a statistically significant difference with regards to the influence of underlying factors (F(2.3, 144.5)=11.256, p<.001), effectiveness of interventions (F(2.4, 153.1)=28.738, p<.001) and policy options (F(2.8, 175.5)=70.854, p<.001). CONCLUSION A majority of respondents believed that genetic, biological, emotional, cognitive and social factors are the most influential explanatory variables in terms of methamphetamine consumption and dependency. Most experts support the use of preventative mechanisms to inhibit drug initiation and delayed drug uptake. Compared to other policies, Project STOP (which aims to disrupt the initial diversion of pseudoephedrine) appears to be a more preferable preventative mechanism to control the production and subsequent sale and use of methamphetamine. This regulatory civil law lever engages third parties in controlling drug-related crime. The literature supports third-party partnerships as it engages experts who have knowledge and expertise with respect to prevention and harm minimization.
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Affiliation(s)
- Matthew Manning
- ANU Centre for Social Research and Methods, The Australian National University, Canberra, A.C.T. 2601, Australia.
| | - Gabriel T W Wong
- ANU Centre for Social Research and Methods, The Australian National University, Canberra, A.C.T. 2601, Australia
| | - Janet Ransley
- Griffith Criminology Institute, Griffith University, Mt Gravatt Campus, Brisbane, Queensland 4122 Australia
| | - Christine Smith
- Griffith Business School, Griffith University, Nathan Campus, Brisbane, Queensland 4111, Australia
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Milan M, Matozzo V, Pauletto M, Di Camillo B, Giacomazzo M, Boffo L, Binato G, Marin MG, Patarnello T, Bargelloni L. Can ecological history influence response to pollutants? Transcriptomic analysis of Manila clam collected in different Venice lagoon areas and exposed to heavy metal. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2016; 174:123-133. [PMID: 26945539 DOI: 10.1016/j.aquatox.2016.02.024] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 02/26/2016] [Accepted: 02/27/2016] [Indexed: 06/05/2023]
Abstract
Chronic exposure to environmental pollutants can exert strong selective pressures on natural populations, favoring the transmission over generations of traits that enable individuals to survive and thrive in highly impacted environments. The lagoon of Venice is an ecosystem subject to heavy anthropogenic impact, mainly due to the industrial activities of Porto Marghera (PM), which led to a severe chemical contamination of soil, groundwater, and sediments. Gene expression analysis on wild Manila clams collected in different Venice lagoon areas enabled to identify differences in gene expression profiles between clams collected in PM and those sampled in clean areas, and the definition of molecular signatures of chemical stress. However, it remains largely unexplored to which extent modifications of gene expression patterns persists after removing the source of contamination. It is also relatively unknown whether chronic exposure to xenobiotics affects the response to other chemical pollutants. To start exploring such issues, in the present study a common-garden experiment was coupled with transcriptomic analysis, to compare gene expression profiles of PM clams with those of clams collected in the less impacted area of Chioggia (CH) during a period under the same control conditions. Part of the two experimental groups were also exposed to copper for seven days to assess whether different "ecological history" does influence response to such pollutant. The results obtained suggest that the chronic exposure to chemical pollution generated a response at the transcriptional level that persists after removal for the contaminated site. These transcriptional changes are centered on key biological processes, such as defense against either oxidative stress or tissue/protein damage, and detoxification, suggesting an adaptive strategy for surviving in the deeply impacted environment of Porto Marghera. On the other hand, CH clams appeared to respond more effectively to copper exposure than PM animals, proposing that chronic exposure to chemical toxicants either lowers the sensitivity to additional toxicants or blunts the capacity to respond to novel chemical challenges in PM clams.
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Affiliation(s)
- Massimo Milan
- Department of Comparative Biomedicine and Food Science, University of Padova, 35020, Legnaro, Italy.
| | - Valerio Matozzo
- Department of Biology, University of Padova, via G. Colombo 3, 35131 Padova, Italy
| | - Marianna Pauletto
- Department of Comparative Biomedicine and Food Science, University of Padova, 35020, Legnaro, Italy
| | | | - Matteo Giacomazzo
- Department of Biology, University of Padova, via G. Colombo 3, 35131 Padova, Italy; Department of Environmental Sciences University of Quèbec at Trois-Rivières, Canada
| | | | - Giovanni Binato
- Laboratory of Chemistry, Istituto Zooprofilattico Sperimentale delle Venezie, Legnaro, Italy
| | | | - Tomaso Patarnello
- Department of Comparative Biomedicine and Food Science, University of Padova, 35020, Legnaro, Italy
| | - Luca Bargelloni
- Department of Comparative Biomedicine and Food Science, University of Padova, 35020, Legnaro, Italy
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Dogra S, Sona C, Kumar A, Yadav PN. Epigenetic regulation of G protein coupled receptor signaling and its implications in psychiatric disorders. Int J Biochem Cell Biol 2016; 77:226-39. [PMID: 27046448 DOI: 10.1016/j.biocel.2016.03.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Revised: 03/21/2016] [Accepted: 03/22/2016] [Indexed: 12/21/2022]
Abstract
G protein-coupled receptors (GPCRs) act as a relay center through which extracellular signals, in the form of neurotransmitters or therapeutics, are converted into an intracellular response, which ultimately shapes the overall response at the tissue and behavioral level. Remarkably in similar ways, epigenetic mechanisms also modulate the expression pattern of a large number of genes in response to the dynamic environment inside and outside of the body, and consequently overall response. Emerging evidences from the pharmacogenomics and preclinical studies clearly suggest that these two distinct mechanisms criss-cross each other in several neurological disorders. At one hand such cross-talks between two distinct mechanisms make disease etiology more challenging to understand, while on the other hand if dealt appropriately, such situations might provide an opportunity to find novel druggable target and strategy for the treatment of complex diseases. In this review article, we have summarized and highlighted the main findings that tie epigenetic mechanisms to GPCR mediated signaling in the pathophysiology of central nervous system (CNS) disorders, including depression, addiction and pain.
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Affiliation(s)
- Shalini Dogra
- Division of Pharmacology, CSIR-Central Drug Research Institute, Lucknow, UP 226031, India
| | - Chandan Sona
- Division of Pharmacology, CSIR-Central Drug Research Institute, Lucknow, UP 226031, India
| | - Ajeet Kumar
- Division of Pharmacology, CSIR-Central Drug Research Institute, Lucknow, UP 226031, India
| | - Prem N Yadav
- Division of Pharmacology, CSIR-Central Drug Research Institute, Lucknow, UP 226031, India.
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Bennett B, Larson C, Richmond PA, Odell AT, Saba LM, Tabakoff B, Dowell R, Radcliffe RA. Quantitative trait locus mapping of acute functional tolerance in the LXS recombinant inbred strains. Alcohol Clin Exp Res 2016; 39:611-20. [PMID: 25833023 DOI: 10.1111/acer.12678] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Accepted: 01/09/2015] [Indexed: 01/23/2023]
Abstract
BACKGROUND We previously reported that acute functional tolerance (AFT) to the hypnotic effects of alcohol was significantly correlated with drinking in the dark (DID) in the LXS recombinant inbred panel, but only in mice that had been pretreated with alcohol. Here, we have conducted quantitative trait locus (QTL) mapping for AFT. DNA sequencing of the progenitor ILS and ISS strains and microarray analyses were also conducted to identify candidate genes and functional correlates. METHODS LXS mice were given either saline or alcohol (5 g/kg) on day 1 and then tested for loss of righting reflex AFT on day 2. QTLs were mapped using standard procedures. Two microarray analyses from brain were conducted: (i) naïve LXS mice and (ii) an alcohol treatment time course in the ILS and ISS. The full genomes of the ILS and ISS were sequenced to a depth of approximately 30×. RESULTS A significant QTL for AFT in the alcohol pretreatment group was mapped to distal chromosome 4; numerous suggestive QTLs were also mapped. Preference drinking and DID have previously been mapped to the chromosome 4 locus. The credible interval of the significant chromosome 4 QTL spanned 23 Mb and included 716 annotated genes of which 150 had at least 1 nonsynonymous single nucleotide polymorphism or small indel that differed between the ILS and ISS; expression of 48 of the genes was cis-regulated. Enrichment analysis indicated broad functional categories underlying AFT, including proteolysis, transcription regulation, chromatin modification, protein kinase activity, and apoptosis. CONCLUSIONS The chromosome 4 QTL is a key region containing possibly pleiotropic genes for AFT and drinking behavior. Given that the region contains many viable candidates and a large number of the genes in the interval fall into 1 or more of the enriched functional categories, we postulate that many genes of varying effect size contribute to the observed QTL effect.
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Affiliation(s)
- Beth Bennett
- Department of Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, Colorado
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Scholpa NE, Briggs SB, Wagner JJ, Cummings BS. Cyclin-Dependent Kinase Inhibitor 1a (p21) Modulates Response to Cocaine and Motivated Behaviors. J Pharmacol Exp Ther 2016; 357:56-65. [PMID: 26791604 DOI: 10.1124/jpet.115.230888] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 01/19/2016] [Indexed: 12/31/2022] Open
Abstract
This study investigated the functional role of cyclin-dependent kinase inhibitor 1a (Cdkn1a or p21) in cocaine-induced responses using a knockout mouse model. Acute locomotor activity after cocaine administration (15 mg/kg, i.p.) was decreased in p21(-/-) mice, whereas cocaine-induced place preference was enhanced. Interestingly, κ-opioid-induced place aversion was also significantly enhanced. Concentration-dependent analysis of locomotor activity in response to cocaine demonstrated a rightward shift in the p21(-/-) mice. Pretreatment with a 5-hydroxytryptamine receptor antagonist did not alter the enhancement of cocaine-induced conditioned place preference in p21(-/-) mice, indicating a lack of involvement of serotonergic signaling in this response. Cocaine exposure increased p21 expression exclusively in the ventral sector of the hippocampus of rodents after either contingent or noncontingent drug administration. Increased p21 expression was accompanied by increased histone acetylation of the p21 promoter region in rats. Finally, increased neurogenesis in the dorsal hippocampus of p21(-/-) mice was also observed. These results show that functional loss of p21 altered the acute locomotor response to cocaine and the conditioned responses to either rewarding or aversive stimuli. Collectively, these findings demonstrate a previously unreported involvement of p21 in modulating responses to cocaine and in motivated behaviors.
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Affiliation(s)
- Natalie E Scholpa
- Departments of Pharmaceutical and Biomedical Sciences (N.E.S., B.S.C.) and Physiology and Pharmacology (S.B.B., J.J.W.), University of Georgia, Athens, Georgia
| | - Sherri B Briggs
- Departments of Pharmaceutical and Biomedical Sciences (N.E.S., B.S.C.) and Physiology and Pharmacology (S.B.B., J.J.W.), University of Georgia, Athens, Georgia
| | - John J Wagner
- Departments of Pharmaceutical and Biomedical Sciences (N.E.S., B.S.C.) and Physiology and Pharmacology (S.B.B., J.J.W.), University of Georgia, Athens, Georgia
| | - Brian S Cummings
- Departments of Pharmaceutical and Biomedical Sciences (N.E.S., B.S.C.) and Physiology and Pharmacology (S.B.B., J.J.W.), University of Georgia, Athens, Georgia
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Azadeh S, Hobbs BP, Ma L, Nielsen DA, Gerard Moeller F, Baladandayuthapani V. Integrative Bayesian analysis of neuroimaging-genetic data with application to cocaine dependence. Neuroimage 2016; 125:813-824. [PMID: 26484829 PMCID: PMC5042574 DOI: 10.1016/j.neuroimage.2015.10.033] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Revised: 09/25/2015] [Accepted: 10/13/2015] [Indexed: 01/22/2023] Open
Abstract
Neuroimaging and genetic studies provide distinct and complementary information about the structural and biological aspects of a disease. Integrating the two sources of data facilitates the investigation of the links between genetic variability and brain mechanisms among different individuals for various medical disorders. This article presents a general statistical framework for integrative Bayesian analysis of neuroimaging-genetic (iBANG) data, which is motivated by a neuroimaging-genetic study in cocaine dependence. Statistical inference necessitated the integration of spatially dependent voxel-level measurements with various patient-level genetic and demographic characteristics under an appropriate probability model to account for the multiple inherent sources of variation. Our framework uses Bayesian model averaging to integrate genetic information into the analysis of voxel-wise neuroimaging data, accounting for spatial correlations in the voxels. Using multiplicity controls based on the false discovery rate, we delineate voxels associated with genetic and demographic features that may impact diffusion as measured by fractional anisotropy (FA) obtained from DTI images. We demonstrate the benefits of accounting for model uncertainties in both model fit and prediction. Our results suggest that cocaine consumption is associated with FA reduction in most white matter regions of interest in the brain. Additionally, gene polymorphisms associated with GABAergic, serotonergic and dopaminergic neurotransmitters and receptors were associated with FA.
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Affiliation(s)
- Shabnam Azadeh
- Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA; School of Public Health, The University of Texas Health Science Center, Houston, TX, USA
| | - Brian P Hobbs
- Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Liangsuo Ma
- Department of Radiology, Virginia Commonwealth University, Richmond, VA, USA; The Institute for Drug and Alcohol Studies, Virginia Commonwealth University, Richmond, VA, USA
| | - David A Nielsen
- Menninger Department of Psychiatry and Behavioral Sciences, Houston, TX, USA; Baylor College of Medicine, Houston, TX, USA; Michael E. DeBakey Veterans Affairs Medical Center, Houston, TX, USA
| | - F Gerard Moeller
- Department of Psychiatry, Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, VA, USA; The Institute for Drug and Alcohol Studies, Virginia Commonwealth University, Richmond, VA, USA
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Liu J, Julnes PS, Chen J, Ehrlich S, Walton E, Calhoun VD. The association of DNA methylation and brain volume in healthy individuals and schizophrenia patients. Schizophr Res 2015; 169:447-452. [PMID: 26381449 PMCID: PMC4681600 DOI: 10.1016/j.schres.2015.08.035] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 08/22/2015] [Accepted: 08/24/2015] [Indexed: 12/12/2022]
Abstract
Both methylation and brain volume patterns hold important biological information for the development and prognosis of schizophrenia (SZ). A combined study to probe the association between them provides a new perspective to understanding SZ. Genomic methylation of peripheral blood and regional brain volumes derived from magnetic resonance imaging were analyzed using parallel independent component analyses in this study. Nine methylation components and five brain volumetric components were extracted for 94 SZ patients and 106 healthy controls. After controlling for age, sex, race, and substance use, a component comprised primarily of bilateral cerebellar volumes was significantly correlated to a methylation component from 14 CpG sites in 13 genes. Both patients and healthy controls demonstrated similar associations, but patients had significantly smaller cerebellar volumes and dysmethylation in the associated epigenetic component compared to controls. The 13 genes are enriched in cellular growth and proliferation with some genes involved in neuronal growth and cerebellum development (GATA4, ADRA1D, EPHA3, and KCNK10), and these genes are prominently associated with neurological and psychological disorders. Such findings suggest that the methylation pattern of the genes coding for cellular growth may influence the cerebellar development through regulating gene expression, and the alteration in the methylation of these genes in SZ patients may contribute to the cerebellar volume reduction observed in patients.
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Affiliation(s)
- Jingyu Liu
- The Mind Research Network, Albuquerque, NM, USA; Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, NM, USA.
| | | | - Jiayu Chen
- The Mind Research Network, Albuquerque, NM, USA
| | - Stefan Ehrlich
- Department of Child and Adolescent Psychiatry, TU-Dresden, Faculty of Medicine, Germany,MGH/MIT/HMS Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, USA
| | - Esther Walton
- Department of Child and Adolescent Psychiatry, TU-Dresden, Faculty of Medicine, Germany
| | - Vince D. Calhoun
- The Mind Research Network, Albuquerque, NM, USA,Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, NM, USA
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Current and Future Prospects for Epigenetic Biomarkers of Substance Use Disorders. Genes (Basel) 2015; 6:991-1022. [PMID: 26473933 PMCID: PMC4690026 DOI: 10.3390/genes6040991] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Revised: 09/16/2015] [Accepted: 09/22/2015] [Indexed: 01/30/2023] Open
Abstract
Substance abuse has an enormous impact on economic and quality of life measures throughout the world. In more developed countries, overutilization of the most common forms of substances of abuse, alcohol and tobacco, is addressed primarily through prevention of substance use initiation and secondarily through the treatment of those with substance abuse or dependence. In general, these therapeutic approaches to substance abuse are deemed effective. However, there is a broad consensus that the development of additional tools to aid diagnosis, prioritize treatment selection and monitor treatment response could have substantial impact on the effectiveness of both substance use prevention and treatment. The recent demonstrations by a number of groups that substance use exposure is associated with robust changes in DNA methylation signatures of peripheral blood cells suggests the possibility that methylation assessments of blood or saliva could find broad clinical applications. In this article, we review recent progress in epigenetic approaches to substance use assessment with a particular emphasis on smoking (and alcohol) related applications. In addition, we highlight areas, such as the epigenetics of psychostimulant, opioid and cannabis abuse, which are markedly understudied and could benefit from intensified collaborative efforts to define epigenetic biomarkers of abuse and dependence.
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Somkuwar SS, Staples MC, Fannon MJ, Ghofranian A, Mandyam CD. Evaluating Exercise as a Therapeutic Intervention for Methamphetamine Addiction-Like Behavior. Brain Plast 2015; 1:63-81. [PMID: 29765835 PMCID: PMC5928557 DOI: 10.3233/bpl-150007] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The need for effective treatments for addiction and dependence to the illicit stimulant methamphetamine in primary care settings is increasing, yet no effective medications have been FDA approved to reduce dependence [1]. This is partially attributed to the complex and dynamic neurobiology underlying the various stages of addiction [2]. Therapeutic strategies to treat methamphetamine addiction, particularly the relapse stage of addiction, could revolutionize methamphetamine addiction treatment. In this context, preclinical studies demonstrate that voluntary exercise (sustained physical activity) could be used as an intervention to reduce methamphetamine addiction. Therefore, it appears that methamphetamine disrupts normal functioning in the brain and this disruption is prevented or reduced by engaging in exercise. This review discusses animal models of methamphetamine addiction and sustained physical activity and the interactions between exercise and methamphetamine behaviors. The review highlights how methamphetamine and exercise affect neuronal plasticity and neurotoxicity in the adult mammalian striatum, hippocampus, and prefrontal cortex, and presents the emerging mechanisms of exercise in attenuating intake and in preventing relapse to methamphetamine seeking in preclinical models of methamphetamine addiction.
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Affiliation(s)
- Sucharita S Somkuwar
- Committee on the Neurobiology of Addictive Disorders, The Scripps Research Institute, La Jolla, CA, USA
| | - Miranda C Staples
- Committee on the Neurobiology of Addictive Disorders, The Scripps Research Institute, La Jolla, CA, USA
| | - McKenzie J Fannon
- Committee on the Neurobiology of Addictive Disorders, The Scripps Research Institute, La Jolla, CA, USA
| | - Atoosa Ghofranian
- Committee on the Neurobiology of Addictive Disorders, The Scripps Research Institute, La Jolla, CA, USA
| | - Chitra D Mandyam
- Committee on the Neurobiology of Addictive Disorders, The Scripps Research Institute, La Jolla, CA, USA
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Rodríguez-Arias M, Aguilar MA, Miñarro J. Therapies in early development for the treatment of opiate addiction. Expert Opin Investig Drugs 2015; 24:1459-72. [PMID: 26414784 DOI: 10.1517/13543784.2015.1086746] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
INTRODUCTION Opiate drugs are psychoactive substances used to manage severe pain. However, their chronic use is associated with the development of addiction. Opiate addiction represents a significant public health concern. AREAS COVERED This review focuses on the most recent advances in the pharmacological treatment of opiate addiction, from those being tested in clinical trials (Phase I and II), to preclinical studies that point to new targets. Readers will gain knowledge of the wide variety of treatments used to treat opiate addiction, including their strengths and weaknesses, and the promising pharmacological targets identified by preclinical research. EXPERT OPINION Among the currently available agonist therapies, new dosage forms of buprenorphine can increase patient acceptability and compliance. New extended-release forms of naltrexone are building hope of retaining opiate-dependent subjects in a drug-free state. Unfortunately, the review of the literature shows that successful preclinical studies are often followed by discouraging results in human clinical trials. Nevertheless, all targets of potential interest should be tested exhaustively. Indeed, a number of new targets and research lines (genetics and neuroinflammation approaches) may lead to breakthroughs in the future.
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Affiliation(s)
- Marta Rodríguez-Arias
- a Universidad de Valencia, Unidad de Investigación Psicobiología de las Drogodependencias, Departamento de Psicobiologia , Avda. Blasco Ibáñez 21, 46010 Valencia, Spain +34 9 63 86 40 20 ; +34 9 63 86 46 68 ;
| | - María A Aguilar
- a Universidad de Valencia, Unidad de Investigación Psicobiología de las Drogodependencias, Departamento de Psicobiologia , Avda. Blasco Ibáñez 21, 46010 Valencia, Spain +34 9 63 86 40 20 ; +34 9 63 86 46 68 ;
| | - José Miñarro
- a Universidad de Valencia, Unidad de Investigación Psicobiología de las Drogodependencias, Departamento de Psicobiologia , Avda. Blasco Ibáñez 21, 46010 Valencia, Spain +34 9 63 86 40 20 ; +34 9 63 86 46 68 ;
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66
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Hines LA, Morley KI, Mackie C, Lynskey M. Genetic and Environmental Interplay in Adolescent Substance Use Disorders. CURRENT ADDICTION REPORTS 2015; 2:122-129. [PMID: 26301173 DOI: 10.1007/s40429-015-0049-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Adolescent substance use is of considerable public health importance. This narrative review provides a brief background to genetically informative research methodologies and highlights key recent literature examining the interplay between genetic and environmental influences in the etiology of substance use. Twin studies have quantified the magnitude of genetic and environmental influences, and more recently co-relative and Children of Twin designs have shown environments can moderate heritability. Studies have identified a number of specific gene variants (e.g. OPRM1, DRD4, 5HTTLPR) that interact with parenting and peer influence, and the effectiveness of interventions may vary by genotype. However, little research has taken into account the stage-sequential nature of substance use. This may obscure important differences in the genetic and environmental influences, and their interplay, at the stages of escalation to problem use. Future research needs to build on existing methodologies to disentangle the complexities of progression in adolescent substance use.
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Affiliation(s)
- Lindsey A Hines
- Addictions Department, King's College London Institute of Psychiatry, Psychology and Neuroscience, 4 Windsor Walk, London SE5 8BB
| | - Katherine I Morley
- Addictions Department, King's College London Institute of Psychiatry, Psychology and Neuroscience, 4 Windsor Walk, London SE5 8BB
| | - Clare Mackie
- Addictions Department, King's College London Institute of Psychiatry, Psychology and Neuroscience, 4 Windsor Walk, London SE5 8BB
| | - Michael Lynskey
- Addictions Department, King's College London Institute of Psychiatry, Psychology and Neuroscience, 4 Windsor Walk, London SE5 8BB
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Blum K, Thanos PK, Badgaiyan RD, Febo M, Oscar-Berman M, Fratantonio J, Demotrovics Z, Gold MS. Neurogenetics and gene therapy for reward deficiency syndrome: are we going to the Promised Land? Expert Opin Biol Ther 2015; 15:973-85. [PMID: 25974314 DOI: 10.1517/14712598.2015.1045871] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
INTRODUCTION Addiction is a substantial health issue with limited treatment options approved by the FDA and as such currently available. The advent of neuroimaging techniques that link neurochemical and neurogenetic mechanisms to the reward circuitry brain function provides a framework for potential genomic-based therapies. AREAS COVERED Through candidate and genome-wide association studies approaches, many gene polymorphisms and clusters have been implicated in drug, food and behavioral dependence linked by the common rubric reward deficiency syndrome (RDS). The results of selective studies that include the role of epigenetics, noncoding micro RNAs in RDS behaviors especially drug abuse involving alcohol, opioids, cocaine, nicotine, pain and feeding are reviewed in this article. New targets for addiction treatment and relapse prevention, treatment alternatives such as gene therapy in animal models, and pharmacogenomics and nutrigenomics methods to manipulate transcription and gene expression are explored. EXPERT OPINION The recognition of the clinical benefit of early genetic testing to determine addiction risk stratification and dopaminergic agonistic, rather than antagonistic therapies are potentially the genomic-based wave of the future. In addition, further development, especially in gene transfer work and viral vector identification, could make gene therapy for RDS a possibility in the future.
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Affiliation(s)
- Kenneth Blum
- Department of Psychiatry & McKnight Brain Institute, University of Florida College of Medicine , Gainesville, FL , USA
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68
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Multigenerational and transgenerational inheritance of drug exposure: The effects of alcohol, opiates, cocaine, marijuana, and nicotine. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2015; 118:21-33. [PMID: 25839742 DOI: 10.1016/j.pbiomolbio.2015.03.002] [Citation(s) in RCA: 103] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Revised: 03/02/2015] [Accepted: 03/06/2015] [Indexed: 12/15/2022]
Abstract
Familial inheritance of drug abuse is composed of both genetic and environmental factors. Additionally, epigenetic transgenerational inheritance may provide a means by which parental drug use can influence several generations of offspring. Recent evidence suggests that parental drug exposure produces behavioral, biochemical, and neuroanatomical changes in future generations. The focus of this review is to discuss these multigenerational and transgenerational phenotypes in the offspring of animals exposed to drugs of abuse. Specifically, changes found following the administration of alcohol, opioids, cocaine, marijuana, and nicotine will be discussed. In addition, epigenetic modifications to the genome following administration of these drugs will be detailed as well as their potential for transmission to the next generation.
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Choo EK, Beauchamp G, Beaudoin FL, Bernstein E, Bernstein J, Bernstein SL, Broderick KB, Cannon RD, D'Onofrio G, Greenberg MR, Hawk K, Hayes RB, Jacquet GA, Lippmann MJ, Rhodes KV, Watts SH, Boudreaux ED. A research agenda for gender and substance use disorders in the emergency department. Acad Emerg Med 2014; 21:1438-46. [PMID: 25444022 DOI: 10.1111/acem.12534] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 09/08/2014] [Accepted: 09/09/2014] [Indexed: 12/30/2022]
Abstract
For many years, gender differences have been recognized as important factors in the etiology, pathophysiology, comorbidities, and treatment needs and outcomes associated with the use of alcohol, drugs, and tobacco. However, little is known about how these gender-specific differences affect ED utilization; responses to ED-based interventions; needs for substance use treatment and barriers to accessing care among patients in the ED; or outcomes after an alcohol-, drug-, or tobacco-related visit. As part of the 2014 Academic Emergency Medicine consensus conference on "Gender-Specific Research in Emergency Care: Investigate, Understand and Translate How Gender Affects Patient Outcomes," a breakout group convened to generate a research agenda on priority questions related to substance use disorders.
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Affiliation(s)
- Esther K. Choo
- Department of Emergency Medicine; Warren Alpert Medical School of Brown University; Providence RI
| | - Gillian Beauchamp
- Department of Emergency Medicine; Oregon Health & Sciences University; Portland OR
| | - Francesca L. Beaudoin
- Department of Emergency Medicine; Warren Alpert Medical School of Brown University; Providence RI
| | - Edward Bernstein
- Department of Emergency Medicine; Boston University School of Medicine; Boston MA
- Department of Community Health Sciences; Boston University School of Public Health; Boston MA
| | - Judith Bernstein
- Department of Emergency Medicine; Boston University School of Medicine; Boston MA
- Department of Community Health Sciences; Boston University School of Public Health; Boston MA
| | | | - Kerryann B. Broderick
- Department of Emergency Medicine; Denver Health; University of Colorado School of Medicine; Denver CO
| | - Robert D. Cannon
- Department of Emergency Medicine; Lehigh Valley Hospital; University of South Florida Morsani College of Medicine; Allentown PA
| | - Gail D'Onofrio
- Department of Emergency Medicine; Yale School of Medicine; New Haven CT
| | - Marna R. Greenberg
- Department of Emergency Medicine; Lehigh Valley Hospital; University of South Florida Morsani College of Medicine; Allentown PA
| | - Kathryn Hawk
- Department of Emergency Medicine; Yale School of Medicine; New Haven CT
| | - Rashelle B. Hayes
- Department of Medicine; University of Massachusetts Medical School; Worcester MA
| | - Gabrielle A. Jacquet
- Department of Emergency Medicine; Boston University School of Medicine; Boston MA
| | - Melanie J. Lippmann
- Department of Emergency Medicine; Warren Alpert Medical School of Brown University; Providence RI
| | - Karin V. Rhodes
- Department of Emergency Medicine; University of Pennsylvania School of Medicine; Philadelphia PA
| | - Susan H. Watts
- Department of Emergency Medicine; Texas Tech University Health Sciences Center; El Paso TX
| | - Edwin D. Boudreaux
- Department of Emergency Medicine; University of Massachusetts Medical School; Worcester MA
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70
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Lewis CR, Olive MF. Early-life stress interactions with the epigenome: potential mechanisms driving vulnerability toward psychiatric illness. Behav Pharmacol 2014; 25:341-51. [PMID: 25003947 PMCID: PMC4119485 DOI: 10.1097/fbp.0000000000000057] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Throughout the 20th century a body of literature concerning the long-lasting effects of the early environment was produced. Adverse experiences in early life, or early-life stress (ELS), is associated with a higher risk of developing various psychiatric illnesses. The mechanisms driving the complex interplay between ELS and adult phenotype has baffled many investigators for decades. Over the last decade, the new field of neuroepigenetics has emerged as one possible mechanism by which ELS can have far-reaching effects on adult phenotype, behavior, and risk for psychiatric illness. Here we review two commonly investigated epigenetic mechanisms, histone modifications and DNA methylation, and the emerging field of neuroepigenetics as they relate to ELS. We discuss the current animal literature demonstrating ELS-induced epigenetic modulation of gene expression that results in altered adult phenotypes. We also briefly discuss other areas in which neuroepigenetics has emerged as a potential mechanism underlying environmental and genetic interactions.
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Affiliation(s)
- Candace Renee Lewis
- Arizona State University, Tempe, AZ, 930 S McAllister Ave, Tempe, AZ 85281, , Phone: (602) 680 – 8786
| | - Michael Foster Olive
- Arizona State University, Tempe, AZ, 930 S McAllister Ave, Tempe, AZ 85281, , Phone: (480) 727-9557
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71
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Wachman EM, Hayes MJ, Lester BM, Terrin N, Brown MS, Nielsen DA, Davis JM. Epigenetic variation in the mu-opioid receptor gene in infants with neonatal abstinence syndrome. J Pediatr 2014; 165:472-8. [PMID: 24996986 PMCID: PMC4145036 DOI: 10.1016/j.jpeds.2014.05.040] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 05/09/2014] [Accepted: 05/22/2014] [Indexed: 12/14/2022]
Abstract
OBJECTIVE Neonatal abstinence syndrome (NAS) from in utero opioid exposure is highly variable with genetic factors appearing to play an important role. Epigenetic changes in cytosine:guanine (CpG) dinucleotide methylation can occur after drug exposure and may help to explain NAS variability. We correlated DNA methylation levels in the mu-opioid receptor (OPRM1) promoter in opioid-exposed infants with NAS outcomes. STUDY DESIGN DNA samples from cord blood or saliva were analyzed for 86 infants who were being treated for NAS according to institutional protocol. Methylation levels at 16 OPRM1 CpG sites were determined and correlated with NAS outcome measures, including need for treatment, treatment with ≥ 2 medications, and length of hospital stay. We adjusted for covariates and multiple genetic testing. RESULTS Sixty-five percent of infants required treatment for NAS, and 24% required ≥ 2 medications. Hypermethylation of the OPRM1 promoter was measured at the -10 CpG in treated vs nontreated infants (adjusted difference δ = 3.2% [95% CI, 0.3-6.0%], P = .03; nonsignificant after multiple testing correction). There was hypermethylation at the -14 (δ = 4.9% [95% CI, 1.8%-8.1%], P = .003), -10 (δ = 5.0% [95% CI, 2.3-7.7%], P = .0005), and +84 (δ = 3.5% [95% CI, 0.6-6.4], P = .02) CpG sites in infants requiring ≥ 2 medications, which remained significant for -14 and -10 after multiple testing correction. CONCLUSIONS Increased methylation within the OPRM1 promoter is associated with worse NAS outcomes, consistent with gene silencing.
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Affiliation(s)
| | - Marie J Hayes
- Psychology, Graduate School of Biomedical Sciences and Engineering, University of Maine, Orono, ME
| | - Barry M Lester
- Center for the Study of Children at Risk, Alpert Medical School of Brown University and Women and Infant's Hospital, Providence, RI
| | - Norma Terrin
- Tufts Clinical and Translational Science Institute, Tufts University, Boston, MA; Institute for Clinical Research and Health Policy Studies, Tufts Medical Center, Boston, MA
| | - Mark S Brown
- Pediatrics, Eastern Maine Medical Center, Bangor, ME
| | - David A Nielsen
- Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, TX
| | - Jonathan M Davis
- Tufts Clinical and Translational Science Institute, Tufts University, Boston, MA; Pediatrics, The Floating Hospital for Children at Tufts Medical Center, Boston, MA
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72
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Epigenetically modified nucleotides in chronic heroin and cocaine treated mice. Toxicol Lett 2014; 229:451-7. [PMID: 25064621 DOI: 10.1016/j.toxlet.2014.07.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Revised: 07/21/2014] [Accepted: 07/22/2014] [Indexed: 12/19/2022]
Abstract
Epigenetic changes include the addition of a methyl group to the 5' carbon of the cytosine ring, known as DNA methylation, which results in the generation of the fifth DNA base, namely 5-methylcytosine. During active or passive demethylation, an intermediate modified base is formed, 5-hydroxymethylcytosine. We have currently quantified 5-methylcytosine and 5-hydroxymethylcytosine in the liver and brain of mice treated with cocaine or heroin, using liquid chromatography/tandem mass spectrometry (LC-MS/MS). Our results show that global 5-methylcytosine levels are not affected by heroin or cocaine administration, neither in the liver nor in the brain. However, 5-hydroxymethylcytosine levels are reduced in the liver following cocaine administration, while they are not affected by cocaine in the brain or by heroin administration in the liver and the brain. Elucidation of the epigenetic phenomena that takes place with respect to drug abuse and addiction, via quantitative analysis of different modified bases, may enable a better understanding of the underlying mechanisms and may lead to more personalized and effective treatment options.
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73
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Ivanov M, Barragan I, Ingelman-Sundberg M. Epigenetic mechanisms of importance for drug treatment. Trends Pharmacol Sci 2014; 35:384-96. [PMID: 24993164 DOI: 10.1016/j.tips.2014.05.004] [Citation(s) in RCA: 111] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Revised: 05/13/2014] [Accepted: 05/23/2014] [Indexed: 12/15/2022]
Abstract
There are pronounced interindividual variations in drug metabolism, drug responses, and the incidence of adverse drug reactions. To a certain extent such variability can be explained by genetic factors, but epigenetic modifications, which are relatively scarcely described so far, also contribute. It is known that a novel class of drugs termed epidrugs intervene in the epigenetic control of gene expression, and many of these are now in clinical trials for disease treatment. In addition, disease prognosis and drug treatment success can be monitored using epigenetic biomarkers. Here we review these novel aspects in pharmacology and address intriguing future opportunities for gene-specific epigenetic editing.
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Affiliation(s)
- Maxim Ivanov
- Pharmacogenetics Section, Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Isabel Barragan
- Pharmacogenetics Section, Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Magnus Ingelman-Sundberg
- Pharmacogenetics Section, Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.
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74
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van der Knaap LJ, Schaefer JM, Franken IHA, Verhulst FC, van Oort FVA, Riese H. Catechol-O-methyltransferase gene methylation and substance use in adolescents: the TRAILS study. GENES BRAIN AND BEHAVIOR 2014; 13:618-25. [PMID: 24902721 DOI: 10.1111/gbb.12147] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Revised: 05/16/2014] [Accepted: 06/02/2014] [Indexed: 12/18/2022]
Abstract
Substance use often starts in adolescence and poses a major problem for society and individual health. The dopamine system plays a role in substance use, and catechol-O-methyltransferase (COMT) is an important enzyme that degrades dopamine. The Val(108/158) Met polymorphism modulates COMT activity and thus dopamine levels, and has been linked to substance use. COMT gene methylation, on the other hand, may affect expression and thus indirectly COMT activity. We investigated whether methylation of the COMT gene was associated with adolescents' substance use. Furthermore, we explored whether the COMT Val(108/158) Met polymorphism interacts with COMT gene methylation in association with substance use. In 463 adolescents (mean age=16, 50.8% girls), substance use (cigarette smoking, alcohol and cannabis use) was assessed with self-report questionnaires. From blood samples, COMT Val(108/158) Met genotype and methylation rates of membrane bound (MB) and soluble (S) COMT promoters were assessed. MB-COMT promoter methylation was associated with non-daily smoking [odds ratio (OR)=1.82, P=0.03], but not with daily smoking (OR=1.20, P=0.34), MB-COMT promoter methylation was not associated with alcohol use. Adolescents with the Met/Met genotype and high rates of MB-COMT promoter methylation were less likely to be high-frequent cannabis users than adolescents with the Val/Val or Val/Met genotype. S-COMT promoter methylation was not associated with substance use. These results indicate that there is an association between substance use and COMT gene methylation. Although this association is complex, combining genetic and epigenetic variation of the COMT gene may be helpful in further elucidating the influence of the dopamine system on substance use in adolescence.
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Affiliation(s)
- L J van der Knaap
- Department of Child and Adolescent Psychiatry & Psychology, Erasmus Medical Center, The Netherlands
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75
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Lukowiak K, Heckler B, Bennett TE, Schriner EK, Wyrick K, Jewett C, Todd RP, Sorg BA. Enhanced memory persistence is blocked by a DNA methyltransferase inhibitor in the snail Lymnaea stagnalis. ACTA ACUST UNITED AC 2014; 217:2920-9. [PMID: 24902747 DOI: 10.1242/jeb.106765] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Lymnaea stagnalis provides an excellent model system for studying memory because these snails have a well-described set of neurons, a single one of which controls expression of long-term memory of operantly conditioned respiratory behavior. We have shown that several different manipulations, including pre-training exposure to serotonin (5-HT) or methamphetamine, submersion of snails after training to prevent memory interference, and exposure to effluent from predatory crayfish (CE), enhance memory persistence. Changes in DNA methylation underlie formation of strong memories in mammals and 5-HT-enhanced long-term facilitation in Aplysia. Here we determined the impact of the DNA methyltransferase inhibitor, 5-aza-2'-deoxycytidine (5-AZA; 87 μmol l(-1)), on enhanced memory persistence by all four manipulations. We found that 5-HT (100 μmol l(-1)) enhanced memory persistence, which was blocked by 5-AZA pretreatment. Snails pre-exposed to 3.3 μmol l(-1) Meth 4 h prior to training demonstrated memory 72 h later, which was not present in controls. This memory-enhancing effect was blocked by pre-treatment with 87 μmol l(-1) 5-AZA. Similarly, submersion to prevent interference learning as well as training in CE produced memory that was not present in controls, and these effects were blocked by pre-treatment with 87 μmol l(-1) 5-AZA. In contrast, 5-AZA injection did not alter expression of normal (non-enhanced) memory, suggesting that these four stimuli enhance memory persistence by increasing DNA methyltransferase activity, which, in turn, increases expression of memory-enhancing genes and/or inhibits memory suppressor genes. These studies lay important groundwork for delineating gene methylation changes that are common to persistent memory produced by different stimuli.
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Affiliation(s)
- Ken Lukowiak
- Cumming School of Medicine, University of Calgary, Calgary, AL T2N 4N1, Canada
| | - Benjamin Heckler
- Alcohol and Drug Abuse Research Program and Translational Addiction Research Center, Department of Integrative Physiology and Neuroscience, Washington State University, Vancouver, WA 98686, USA
| | - Thomas E Bennett
- Alcohol and Drug Abuse Research Program and Translational Addiction Research Center, Department of Integrative Physiology and Neuroscience, Washington State University, Vancouver, WA 98686, USA
| | - Ellen K Schriner
- Alcohol and Drug Abuse Research Program and Translational Addiction Research Center, Department of Integrative Physiology and Neuroscience, Washington State University, Vancouver, WA 98686, USA
| | - Kathryn Wyrick
- Alcohol and Drug Abuse Research Program and Translational Addiction Research Center, Department of Integrative Physiology and Neuroscience, Washington State University, Vancouver, WA 98686, USA
| | - Cynthia Jewett
- Alcohol and Drug Abuse Research Program and Translational Addiction Research Center, Department of Integrative Physiology and Neuroscience, Washington State University, Vancouver, WA 98686, USA
| | - Ryan P Todd
- Alcohol and Drug Abuse Research Program and Translational Addiction Research Center, Department of Integrative Physiology and Neuroscience, Washington State University, Vancouver, WA 98686, USA
| | - Barbara A Sorg
- Alcohol and Drug Abuse Research Program and Translational Addiction Research Center, Department of Integrative Physiology and Neuroscience, Washington State University, Vancouver, WA 98686, USA
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76
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Shirazi J, Shah S, Sagar D, Nonnemacher MR, Wigdahl B, Khan ZK, Jain P. Epigenetics, drugs of abuse, and the retroviral promoter. J Neuroimmune Pharmacol 2013; 8:1181-96. [PMID: 24218017 PMCID: PMC3878082 DOI: 10.1007/s11481-013-9508-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2013] [Accepted: 10/10/2013] [Indexed: 01/06/2023]
Abstract
Drug abuse alone has been shown to cause epigenetic changes in brain tissue that have been shown to play roles in addictive behaviors. In conjunction with HIV-1 infection, it can cause epigenetic changes at the viral promoter that can result in altered gene expression, and exacerbate disease progression overall. This review entails an in-depth look at research conducted on the epigenetic effects of three of the most widely abused drugs (cannabinoids, opioids, and cocaine), with a particular focus on the mechanisms through which these drugs interact with HIV-1 infection at the viral promoter. Here we discuss the impact of this interplay on disease progression from the point of view of the nature of gene regulation at the level of chromatin accessibility, chromatin remodeling, and nucleosome repositioning. Given the importance of chromatin remodeling and DNA methylation in controlling the retroviral promoter, and the high susceptibility of the drug abusing population of individuals to HIV infection, it would be beneficial to understand the way in which the host genome is modified and regulated by drugs of abuse.
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Affiliation(s)
- Jasmine Shirazi
- Department of Microbiology and Immunology, and the Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA, USA
| | - Sonia Shah
- Department of Microbiology and Immunology, and the Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA, USA
| | - Divya Sagar
- Department of Microbiology and Immunology, and the Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA, USA
| | - Michael R. Nonnemacher
- Department of Microbiology and Immunology, and the Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA, USA
| | - Brian Wigdahl
- Department of Microbiology and Immunology, and the Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA, USA
| | - Zafar K. Khan
- Department of Microbiology and Immunology, and the Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA, USA
| | - Pooja Jain
- Department of Microbiology and Immunology, and the Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA, USA
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Lasky-Su J. A network medicine approach to psychiatric genetics. Am J Med Genet B Neuropsychiatr Genet 2013; 162B:579-86. [PMID: 24132892 DOI: 10.1002/ajmg.b.32191] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2013] [Accepted: 07/11/2013] [Indexed: 12/14/2022]
Abstract
The major psychiatric disorders are complex in nature, meaning that they are influenced by multiple environmental and genetic exposures that perturb the intricate cellular network, resulting in disease. In general, psychiatric diseases are highly heritable but also have important environmental etiologies. Environmental influences include neonatal exposures, social environments, psychological mechanisms, and abnormal functioning of the neurotransmitter system. Molecular influences can be identified using many data types including genomics, epigenomics, transcriptomics, metabolomics, and proteomics. The emerging field of network medicine offers a new approach to explore the complexities of disease development in a framework that considers a holistic, rather than a reductionist viewpoint. In this review we explain a general framework of how the network medicine approach can provide valuable insight into understanding important molecular mechanisms that contribute to the pathogenesis of psychiatric disorders.
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Affiliation(s)
- Jessica Lasky-Su
- Department of Network Medicine, Channing Laboratories, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts
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Lynch WJ, Peterson AB, Sanchez V, Abel J, Smith MA. Exercise as a novel treatment for drug addiction: a neurobiological and stage-dependent hypothesis. Neurosci Biobehav Rev 2013; 37:1622-44. [PMID: 23806439 PMCID: PMC3788047 DOI: 10.1016/j.neubiorev.2013.06.011] [Citation(s) in RCA: 199] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 04/29/2013] [Accepted: 06/13/2013] [Indexed: 12/11/2022]
Abstract
Physical activity, and specifically exercise, has been suggested as a potential treatment for drug addiction. In this review, we discuss clinical and preclinical evidence for the efficacy of exercise at different phases of the addiction process. Potential neurobiological mechanisms are also discussed focusing on interactions with dopaminergic and glutamatergic signaling and chromatin remodeling in the reward pathway. While exercise generally produces an efficacious response, certain exercise conditions may be either ineffective or lead to detrimental effects depending on the level/type/timing of exercise exposure, the stage of addiction, the drug involved, and the subject population. During drug use initiation and withdrawal, its efficacy may be related to its ability to facilitate dopaminergic transmission, and once addiction develops, its efficacy may be related to its ability to normalize glutamatergic and dopaminergic signaling and reverse drug-induced changes in chromatin via epigenetic interactions with brain-derived neurotrophic factor (BDNF) in the reward pathway. We conclude with future directions, including the development of exercise-based interventions alone or as an adjunct to other strategies for treating drug addiction.
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Affiliation(s)
- Wendy J Lynch
- Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, 1670 Discovery Drive, Charlottesville, VA 22911, USA.
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Spellicy CJ, Kosten TR, Hamon SC, Harding MJ, Nielsen DA. The MTHFR C677T Variant is Associated with Responsiveness to Disulfiram Treatment for Cocaine Dependency. Front Psychiatry 2013; 3:109. [PMID: 23335901 PMCID: PMC3544007 DOI: 10.3389/fpsyt.2012.00109] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Accepted: 12/01/2012] [Indexed: 01/09/2023] Open
Abstract
OBJECTIVE Disulfiram is a one of the few pharmacotherapies for cocaine addiction that shows promise. Since disulfiram and cocaine both affect levels of global methylation we hypothesized the MTHFR gene, whose product is involved in supplying methyl groups for DNA and protein methylation, may be associated with responsiveness to disulfiram in cocaine-dependent individuals. METHODS Sixty-seven cocaine-dependent patients were stabilized on methadone for 2 weeks and then randomized into disulfiram (250 mg/day, N = 32) and placebo groups (N = 35) for 10 weeks. Patients were genotyped for the MTHFR (rs1801133, also known as C677T) polymorphism and the data was evaluated for association with cocaine-free urines in the disulfiram or placebo groups. Data from patients that completed all 10 weeks of the study (N = 56) were analyzed using repeated measures analysis of variance (ANOVA), corrected for population structure. RESULTS The CT or TT MTHFR genotype group (N = 32) dropped from 73 to 52% cocaine-positive urines on disulfiram (p = 0.0001), while the placebo group showed no treatment effect. The CC MTHFR genotype group (N = 24) showed a smaller, but still significant, reduction in cocaine-positive urines on disulfiram compared to placebo; 81-69% (p = 0.007). CONCLUSION This study indicates that a patient's MTHFR genotype may be used to identify individuals who might show improved response to disulfiram treatment for cocaine dependence. CLINICAL TRIAL Pharmacogenetics of Disulfiram for Cocaine, clinicaltrials.gov/ct2/show/NCT00149630, NIDA-18197-2, NCT00149630.
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Affiliation(s)
- Catherine J. Spellicy
- Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine and Michael E. DeBakey V. A. Medical CenterHouston, TX, USA
| | - Thomas R. Kosten
- Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine and Michael E. DeBakey V. A. Medical CenterHouston, TX, USA
| | - Sara C. Hamon
- Laboratory of Statistical Genetics, The Rockefeller UniversityNew York, NY, USA
| | - Mark J. Harding
- Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine and Michael E. DeBakey V. A. Medical CenterHouston, TX, USA
| | - David A. Nielsen
- Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine and Michael E. DeBakey V. A. Medical CenterHouston, TX, USA
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