title: Epigenetic Control of the Vasopressin Promoter Explains Physiological Ability to Regulate Vasopressin Transcription in Dehydration and Salt Loading States in the Rat.
abstract: The synthesis of arginine vasopressin (AVP) in the supraoptic nucleus (SON) and paraventricular nucleus (PVN) of the hypothalamus is sensitive to increased plasma osmolality and a decreased blood volume, and thus is robustly increased by both dehydration (increased plasma osmolality and decreased blood volume) and salt loading (increased plasma osmolality). Both stimuli result in functional remodelling of the SON and PVN, a process referred to as functional-related plasticity. Such plastic changes in the brain have recently been associated with altered patterns of DNA methylation at CpG (cytosine-phosphate-guanine) residues, a process considered to be important for the regulation of gene transcription. In this regard, the proximal Avp promoter contains a number of CpG sites and is recognised as one of four CpG islands for the Avp gene, suggesting that methylation may be regulating Avp transcription. In the present study, we show that, in an immortalised hypothalamic cell line 4B, the proximal Avp promoter is highly methylated, and treatment of these cells with the DNA methyltransferase inhibitor 5-Aza-2'-deoxycytidine to demethylate DNA dramatically increases basal and stimulated Avp biosynthesis. We report no changes in the expression of DNA methyltransferases, Dnmt1 and Dnmt3a, whereas there is decreased expression of the demethylating enzyme ten-eleven-translocation 2, Tet2, in the SON by dehydration and salt loading. We found higher methylation of the SON Avp promoter in dehydrated but not salt-loaded rats. By analysis of individual CpG sites, we observed hypomethylation, hypermethylation and no change in methylation of specific CpGs in the SON Avp promoter of the dehydrated rat. Using reporter gene assays, we show that mutation of individual CpGs can result in altered Avp promoter activity. We propose that methylation of the SON Avp promoter is necessary to co-ordinate the duel inputs of increased plasma osmolality and decreased blood volume on Avp transcription in the chronically dehydrated rat.
authors.affiliation: School of Clinical Sciences, University of Bristol, Bristol, UK.
authors.forename: M P
authors.initials: MP
authors.lastname: Greenwood
authors.affiliation: School of Clinical Sciences, University of Bristol, Bristol, UK.
authors.forename: M
authors.initials: M
authors.lastname: Greenwood
authors.affiliation: School of Clinical Sciences, University of Bristol, Bristol, UK.
authors.forename: B T
authors.initials: BT
authors.lastname: Gillard
authors.affiliation: Department of Physiology, University of Malaya, Kuala Lumpur, Malaysia.
authors.forename: S Y
authors.initials: SY
authors.lastname: Loh
authors.affiliation: School of Physiology and Pharmacology, University of Bristol, Bristol, UK.
authors.forename: J F R
authors.initials: JF
authors.lastname: Paton
authors.affiliation: School of Clinical Sciences, University of Bristol, Bristol, UK.|Department of Physiology, University of Malaya, Kuala Lumpur, Malaysia.
authors.forename: D
authors.initials: D
authors.lastname: Murphy
mesh_terms: D000818:Animals; D001374:Azacitidine / Q000031:analogs & derivatives / Q000494:pharmacology; D002460:Cell Line; D000076123:DNA (Cytosine-5-)-Methyltransferase 1 / Q000096:biosynthesis; D004248:DNA (Cytosine-5-)-Methyltransferases / Q000378:metabolism; D019175:DNA Methylation / Q000235:genetics*; D000090205:DNA Methyltransferase 3A; D000077209:Decitabine; D003681:Dehydration / Q000235:genetics*; D000073398:Demethylation / Q000187:drug effects; D044127:Epigenesis, Genetic / Q000235:genetics*; D007031:Hypothalamus / Q000378:metabolism; D008297:Male; D009154:Mutation; D009994:Osmolar Concentration; D011401:Promoter Regions, Genetic / Q000235:genetics*; D051381:Rats; D012965:Sodium Chloride / Q000378:metabolism* / Q000494:pharmacology; D014667:Vasopressins / Q000235:genetics*
chemical_list: D014667:Vasopressins; D012965:Sodium Chloride; D000077209:Decitabine; D000076123:DNA (Cytosine-5-)-Methyltransferase 1; D004248:DNA (Cytosine-5-)-Methyltransferases; D000090205:DNA Methyltransferase 3A; C000619382:Dnmt1 protein, rat; D001374:Azacitidine
keywords: arginine vasopressin; hyperosmotic; hypovolaemia; methylation; supraoptic nucleus
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