{"id":169,"date":"2019-03-11T11:31:58","date_gmt":"2019-03-11T11:31:58","guid":{"rendered":"http:\/\/niaaa.peachpuff-wolverine-566518.hostingersite.com\/?p=169"},"modified":"2019-03-11T12:36:49","modified_gmt":"2019-03-11T12:36:49","slug":"nih-funded-rodent-study-finds-molecular-link-between-adolescent-alcohol-use-and-adult-anxiety","status":"publish","type":"post","link":"https:\/\/scienceblog.com\/niaaa\/169\/nih-funded-rodent-study-finds-molecular-link-between-adolescent-alcohol-use-and-adult-anxiety\/","title":{"rendered":"NIH-funded rodent study finds molecular link between adolescent alcohol use and adult anxiety"},"content":{"rendered":"

New preclinical research in rats has identified a link between adolescent alcohol exposure and specific molecular changes in the brain that contribute to increased anxiety in adulthood. A large body of evidence demonstrates a strong relationship between alcohol and anxiety problems in humans.<\/p>\n

\u201cThese findings provide insight into the mechanisms through which alcohol-induced brain changes during adolescence increase vulnerability to alcohol and anxiety problems in adulthood,\u201d said George F. Koob, Ph.D., director of the National Institute on Alcohol Abuse and Alcoholism (NIAAA), part of the National Institutes of Health.<\/p>\n

The new report is the latest installment of work led by NIAAA grantee Subhash C. Pandey, Ph.D., professor and director of the NIAAA-funded Alcohol Research Center in the Department of Psychiatry at the University of Illinois at Chicago and a Senior Research Career Scientist at Jesse Brown VA Medical Center in Chicago. Dr. Pandey and his colleagues have previously reported that rats exposed to alcohol during adolescence show greater anxiety-like behavior as adults compared to non-alcohol exposed rats.\u00a0 They have also shown that those effects were linked to two genes \u2013 brain-derived neurotrophic factor (Bdnf) and activity-regulated cytoskeleton-associated protein (Arc) — that nerve cells need to form new connections with each other.<\/p>\n

In the current study, the Pandey group focused on epigenetic changes that affect expression of the Arc protein in the amygdala, a brain region linked to anxiety and alcohol misuse. Epigenetic changes refer to DNA modifications that affect expression of a gene without altering the gene\u2019s DNA sequence.\u00a0 Specifically, the researchers wanted to determine if expression of a relatively new class of genetic material known as enhancer RNA (eRNA) was influenced by adolescent alcohol exposure and if epigenetic mechanisms, in turn, influenced expression of the Arc eRNA and gene in the adult amygdala.\u00a0 They also wanted to know whether this epigenetic mechanism played a role in anxiety-like behavior in adult animals that were exposed to alcohol during adolescence.\u00a0 A report of their findings is online in the journal Biological Psychiatry.<\/p>\n

\u201ceRNAs are noncoding RNAs that do not encode into protein but regulate a target gene\u2019s function, thus representing crucial molecular events in gene expression,\u201d explained Dr. Pandey.<\/p>\n

As in their previous studies, the researchers administered alcohol to adolescent rats using a binge drinking-like model and examined the animals for anxiety-like behaviors in adulthood, including how blocking the activity of eRNAs specific to the Arc gene affected those behaviors.<\/p>\n

They found that compared to adult animals without adolescent alcohol-exposure, the adolescent alcohol-exposed rats displayed both decreased Arc eRNA expression and Arc gene expression in the amygdala, as well as heightened anxiety-like behavior in adulthood. However, a dose of alcohol reduced the anxiety-like behavior and was associated with a reversal in Arc eRNA and Arc gene expression \u2013 suggesting that Arc contributes to anxiety-like behavior.<\/p>\n

\u201cWe identified underlying epigenetic processes regulating Arc eRNA expression in adulthood that are affected by adolescent alcohol exposure,\u201d said Dr. Pandey. \u201cAdolescent alcohol exposure produces persistent effects on eRNA related to Arc gene expression via epigenetic reprogramming and lower eRNA levels in the amygdala. These effects, in turn, increased the susceptibility to anxiety in adulthood.\u201d<\/p>\n

Lastly, Dr. Pandey and his colleagues showed that directly blocking Arc eRNA in the amygdala of control rats led to anxiety-like behaviors, demonstrating that Arc eRNA expression in the amygdala regulates anxiety-like behaviors.<\/p>\n

\u201cThese findings provide a better understanding of how adolescent alcohol exposure can lead to life-long biomolecular changes that increase the risk for adult-onset psychiatric disorders,\u201d said Dr. Pandey.<\/p>\n

Further research is necessary to determine if these newly identified molecular targets might lead to the development of better therapies for pathologies related to adolescent alcohol exposure.<\/p>\n

Reference:<\/p>\n

Kyzar EJ, Zhang H, Pandey SC. (2019). Adolescent Alcohol Exposure Epigenetically Suppresses Amygdala Arc Enhancer RNA Expression to Confer Adult Anxiety Susceptibility.\u00a0 Biol Psychiatry. 2019 Jan 14.pii: S0006-3223(19)30030-7. [Epub ahead of print].<\/p>\n

 <\/p>\n

The National Institute on Alcohol Abuse and Alcoholism, part of the National Institutes of Health, is the primary U.S. agency for conducting and supporting research on the causes, consequences, prevention, and treatment of alcohol abuse, alcoholism, and alcohol problems. NIAAA also disseminates research findings to general, professional, and academic audiences. Additional alcohol research information and publications are available at http:\/\/www.niaaa.nih.gov<\/a>.<\/p>\n

About the National Institutes of Health (NIH): NIH, the nation’s medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit www.nih.gov<\/a><\/u>.<\/p>\n","protected":false},"excerpt":{"rendered":"

New preclinical research in rats has identified a link between adolescent alcohol exposure and specific molecular changes in the brain that contribute to increased anxiety in adulthood. A large body of evidence demonstrates a strong relationship between alcohol and anxiety problems in humans. \u201cThese findings provide insight into the mechanisms through which alcohol-induced brain changes … Read more<\/a><\/p>\n","protected":false},"author":336,"featured_media":170,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"generate_page_header":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[16],"tags":[45,27,47,30,29,22,28,20],"class_list":["post-169","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-adolescents","tag-alcohol","tag-anxiety","tag-brain","tag-national-institute-on-alcohol-abuse-and-alcoholism","tag-national-institutes-of-health","tag-niaaa","tag-nih"],"yoast_head":"\nNIH-funded rodent study finds molecular link between adolescent alcohol use and adult anxiety - News from the National Institute on Alcohol Abuse and Alcoholism<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/scienceblog.com\/niaaa\/169\/nih-funded-rodent-study-finds-molecular-link-between-adolescent-alcohol-use-and-adult-anxiety\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NIH-funded rodent study finds molecular link between adolescent alcohol use and adult anxiety\" \/>\n<meta property=\"og:description\" content=\"New preclinical research in rats has identified a link between adolescent alcohol exposure and specific molecular changes in the brain that contribute to increased anxiety in adulthood. 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