Unknown,Transcriptomics,Genomics,Proteomics

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Changes in Gene Expression within the Ventral Tegmental Area Following Loss-of-Control Alcohol Drinking by Alcohol-Preferring (P) Rats

ABSTRACT: The objective of this study was to determine changes in gene expression in the ventral tegmental area (VTA) following loss-of-control alcohol drinking by alcohol-preferring (P) rats. Adult female P rats (n = 7) were given concurrent access to 10, 20 and 30% EtOH for four 1-hr sessions daily for 10 weeks followed by 2 cycles of 2 weeks of abstinence and 2 weeks of EtOH access. Rats were killed by decapitation 3 hr after the 4th daily EtOH-access session at the end of the second 2-week relapse period. An age-matched water control group of female P rats (n = 8) was also killed. RNA was prepared from micropunch samples of the VTA from individual rats; analyses were conducted with Affymetrix Rat 230.2 chips. Ethanol intakes were 1.5-2.5 g/kg per sessions, resulting in blood levels >200 mg% at the end of the 4th session. There were 211 named genes that were significantly different (FDR = 0.1) between the water and EtOH groups. Bioinformatics analyses indicated alterations in (a) transcription factors that reduced excitation-coupled transcription and promoted exocitotic neuronal damage involving clusters of genes associated with Nfkbia, Fos and Srebf1; (b) genes that reduced cholesterol and fatty acid synthesis, and increased protein degradation; and (c) genes involved in cell-to-cell interactions and regulation of the actin cytoskeleton. Among the named genes, there were 62 genes in common with differences between alcohol-naïve P and non-preferring (NP) rats, with 43 of the genes changing in the opposite direction following excessive binge-like drinking. These genes are involved in a pro-inflammatory response, and enhanced response to glucocorticoids and steroid hormones. Overall, the results of this study indicated that excessive binge-like alcohol drinking by P rats may be altering the expression of genes that promote neuronal damage. Comparison of Differences in Gene Expression in the Ventral Tegmental Area of Rat Lines Selectively Bred for High or Low Alcohol Consumption

ORGANISM(S): Rattus norvegicus

SUBMITTER: Mark Kimpel

PROVIDER: E-GEOD-42578 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:The objective of this study was to determine changes in gene expression within the extended amygdala following binge-like alcohol drinking by adolescent alcohol-preferring (P) rats. Starting at 28 days of age, P rats were given concurrent access to 15 and 30 % ethanol for 3 one-h sessions for 5 consecutive days each week until they were 49 days old. Rats were killed by decapitation 3 h after the first ethanol access session on the 15th day of drinking. RNA was prepared from micropunch samples of the nucleus accumbens shell (Acb-sh) and central nucleus of the amygdala (CeA). Ethanol intakes were 2.5 to 3.0 g/kg/session. There were 154 and 182 unique named genes that significantly differed (FDR = 0.2) between the water and ethanol group in the Acb-sh and CeA, respectively. Gene Ontology (GO) analyses indicated that adolescent binge drinking produced changes in the in biological processes involved in cell proliferation and regulation of cellular structure in the Acb-sh, and in neuron projection and positive regulation of cellular organization in the CeA. Ingenuity Pathway Analysis indicated that, in the Acb-sh, there were several major intracellular signaling pathways (e.g., cAMP-mediated and protein kinase A signaling pathways) altered by adolescent drinking, with 3-fold more genes up-regulated than down-regulated in the alcohol group. The cAMP-mediated signaling system was also up-regulated in the CeA of the alcohol group. Weighted gene co-expression network analysis (WGCNA) indicated significant G-protein coupled receptor signaling and transmembrane receptor protein kinase signaling categories in the Acb-sh and CeA, respectively. Overall, the results of this study indicated that binge-like alcohol drinking by adolescent P rats is differentially altering the expression of genes in the Acb-sh and CeA, some of which are involved in intracellular signaling pathways and may produce long-term changes in neuronal function. Differences in gene expression in the central nucleus of the amygdala (CeA) were compared in two groups of alcohol-preferring (P) rats, one given water only and the other given access to 15 & 30% ethanol during adolescence.

Project description:The objective of this study was to determine changes in gene expression within the extended amygdala following binge-like alcohol drinking by adolescent alcohol-preferring (P) rats. Starting at 28 days of age, P rats were given concurrent access to 15 and 30 % ethanol for 3 one-h sessions for 5 consecutive days each week until they were 49 days old. Rats were killed by decapitation 3 h after the first ethanol access session on the 15th day of drinking. RNA was prepared from micropunch samples of the nucleus accumbens shell (Acb-sh) and central nucleus of the amygdala (CeA). Ethanol intakes were 2.5 ‚Äì 3.0 g/kg/session. There were 154 and 182 unique named genes that significantly differed (FDR = 0.2) between the water and ethanol group in the Acb-sh and CeA, respectively. Gene Ontology (GO) analyses indicated that adolescent binge drinking produced changes in the in biological processes involved in cell proliferation and regulation of cellular structure in the Acb-sh, and in neuron projection and positive regulation of cellular organization in the CeA. Ingenuity Pathway Analysis indicated that, in the Acb-sh, there were several major intracellular signaling pathways (e.g., cAMP-mediated and protein kinase A signaling pathways) altered by adolescent drinking, with 3-fold more genes up-regulated than down-regulated in the alcohol group. The cAMP-mediated signaling system was also up-regulated in the CeA of the alcohol group. Weighted gene co-expression network analysis (WGCNA) indicated significant G-protein coupled receptor signaling and transmembrane receptor protein kinase signaling categories in the Acb-sh and CeA, respectively. Overall, the results of this study indicated that binge-like alcohol drinking by adolescent P rats is differentially altering the expression of genes in the Acb-sh and CeA, some of which are involved in intracellular signaling pathways and may produce long-term changes in neuronal function. Differences in gene expression in brain nucleus accumbens shell (Acb-sh) were compared in two groups of alcohol-preferring (P) rats, one given water only and the other given access to 15 & 30% ethanol during adolescence.

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Changes in Gene Expression within the Ventral Tegmental Area Following Loss-of-Control Alcohol Drinking by Alcohol-Preferring (P) Rats

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