Methamphetamine Induces TET1- and TET3-Dependent DNA Hydroxymethylation of Crh and Avp Genes in the Rat Nucleus Accumbens

• Published in: Molecular neurobiology 2018-06, Vol.55 (6), p.5154-5166
• Main Authors: Jayanthi, Subramaniam, Gonzalez, Betina, McCoy, Michael T., Ladenheim, Bruce, Bisagno, Veronica, Cadet, Jean Lud
• Format: Article
• Language: English
• Subjects: Addictions; Amphetamines; Animals; Arginine Vasopressin - genetics; Arginine Vasopressin - metabolism; Argipressin; Biomedical and Life Sciences; Biomedicine; Cell Biology; Chromatin; Cocaine; Cocaine- and amphetamine-regulated transcript protein; Corticotropin-releasing hormone; Corticotropin-Releasing Hormone - genetics; Corticotropin-Releasing Hormone - metabolism; Cyclic AMP response element-binding protein; Cyclic AMP Response Element-Binding Protein - metabolism; Deoxyribonucleic acid; Dioxygenases - metabolism; DNA; DNA (Cytosine-5-)-Methyltransferase 1 - metabolism; DNA Methylation - drug effects; DNA Methylation - genetics; Enzymes; Epigenetics; Gene expression; Gene Expression Regulation - drug effects; Immunoprecipitation; Male; Methamphetamine; Methamphetamine - pharmacology; Models, Biological; Neurobiology; Neurology; Neuropeptides; Neuropeptides - genetics; Neuropeptides - metabolism; Neurosciences; Nucleotide sequence; Nucleus accumbens; Nucleus Accumbens - drug effects; Nucleus Accumbens - metabolism; Phosphorylation - drug effects; Promoter Regions, Genetic - genetics; Protein transport; Rats, Sprague-Dawley; Rodents; Transcription activation; Translocation; Vasopressin
• ISSN: 0893-7648; 1559-1182; 1559-1182
• DOI: 10.1007/s12035-017-0750-9

Methamphetamine (METH) addiction is a biopsychosocial disorder that is accompanied by multiple relapses even after prolonged abstinence, suggesting the possibilities of long-lasting maladaptive epigenetic changes in the brain. Here, we show that METH administration produced time-dependent increases in the expression of corticotropin-releasing hormone ( Crh / Crf ), arginine vasopressin ( Avp ), and cocaine- and amphetamine-regulated transcript prepropeptide ( Cartpt ) mRNAs in the rat nucleus accumbens (NAc). Chromatin immunoprecipitation (ChIP) assays revealed that METH increased the abundance of phosphorylated CREB (pCREB) at the promoter of Cartpt but not at Avp or Crh DNA sequences. In contrast, METH produced DNA hypomethylation at sites near the Crh transcription start site (TSS) and at intragenic Avp sequences. METH also increased DNA hydroxymethylation at the Crh TSS and at intragenic Avp sites. In addition, METH increased the protein expression of ten-eleven-translocation enzymes that catalyze DNA hydroxymethylation. Importantly, METH increased TET1 binding at the Crh promoter and increased TET3 binding at Avp intragenic regions. We further tested the role of TET enzymes in METH-induced changes in gene expression by using the TET inhibitor, 1,5-isoquinolinediol (IQD), and found that IQD blocked METH-induced increases in Crh and Avp mRNA expression. Together, these results indicate that METH produced changes in neuropeptide transcription by both activation of the cAMP/CREB pathway and stimulation of TET-dependent DNA hydroxymethylation. These results provide molecular evidence for epigenetic controls of METH-induced changes in the expression of neuropeptides.