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Healey K, Waters RC, Knight SG, Wandling GM, Hall NI, Jones BN, Shobande MJ, Melton JG, Pandey SC, Scott Swartzwelder H, Maldonado-Devincci AM. Adolescent intermittent ethanol exposure alters adult exploratory and affective behaviors, and cerebellar Grin2b expression in C57BL/6J mice. Drug Alcohol Depend 2023; 253:111026. [PMID: 38006668 PMCID: PMC10990063 DOI: 10.1016/j.drugalcdep.2023.111026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 09/17/2023] [Accepted: 11/01/2023] [Indexed: 11/27/2023]
Abstract
Binge drinking is one of the most common patterns (more than 90%) of alcohol consumption by young people. During adolescence, the brain undergoes maturational changes that influence behavioral control and affective behaviors, such as cerebellar brain volume and function in adulthood. We investigated long-term impacts of adolescent binge ethanol exposure on affective and exploratory behaviors and cerebellar gene expression in adult male and female mice. Further, the cerebellum is increasingly recognized as a brain region integrating a multitude of behaviors that span from the traditional primary sensory-motor to affective functions, such as anxiety and stress reactivity. Therefore, we investigated the persistent effects of adolescent intermittent ethanol (AIE) on exploratory and affective behaviors and began to elucidate the role of the cerebellum in these behaviors through excitatory signaling gene expression. We exposed C57BL/6J mice to AIE or air (control) vapor inhalation from postnatal day 28-42. After prolonged abstinence (>34 days), in young adulthood (PND 77+) we assessed behavior in the open field, light/dark, tail suspension, and forced swim stress tests to determine changes in affective behaviors including anxiety-like, depressive-like, and stress reactivity behavior. Excitatory signaling gene mRNA levels of fragile X messenger ribonucleoprotein (FMR1), glutamate receptors (Grin2a, Grin2b and Grm5) and excitatory synaptic markers (PSD-95 and Eaat1) were measured in the cerebellum of adult control and AIE-exposed mice. AIE-exposed mice showed decreased exploratory behaviors in the open field test (OFT) where both sexes show reduced ambulation, however only females exhibited a reduction in rearing. Additionally, in the OFT, AIE-exposed females also exhibited increased anxiety-like behavior (entries to center zone). In the forced swim stress test, AIE-exposed male mice, but not females, spent less time immobile compared to their same-sex controls, indicative of sex-specific changes in stress reactivity. Male and female AIE-exposed mice showed increased Grin2b (Glutamate Ionotropic Receptor NMDA Type Subunit 2B) mRNA levels in the cerebellum compared to their same-sex controls. Together, these data show that adolescent binge-like ethanol exposure altered both exploratory and affective behaviors in a sex-specific manner and modified cerebellar Grin2b expression in adult mice. This indicates the cerebellum may serve as an important brain region that is susceptible to long-term molecular changes after AIE.
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Affiliation(s)
- Kati Healey
- Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, 323 Foster St., Durham, NC 27701, United States
| | - Renee C Waters
- Department of Psychology, Hairston College of Health and Human Sciences, North Carolina Agricultural and Technical State University, Greensboro, NC 27411, United States; Department of Psychology, Princeton Neuroscience Institute, Princeton University, Princeton, NJ 08540, United States
| | - Sherilynn G Knight
- Department of Biology, College of Science and Technology, North Carolina Agricultural and Technical State University, Greensboro, NC 27411, United States
| | - Gabriela M Wandling
- Center for Alcohol Research in Epigenetics, Department of Psychiatry, University of Illinois, Chicago, IL, United States
| | - Nzia I Hall
- Department of Biology, College of Science and Technology, North Carolina Agricultural and Technical State University, Greensboro, NC 27411, United States; University of North Carolina at Chapel Hill School of Medicine, NC 27516, United States
| | - Brooke N Jones
- Department of Biology, College of Science and Technology, North Carolina Agricultural and Technical State University, Greensboro, NC 27411, United States
| | - Mariah J Shobande
- Department of Chemical, Biological and Bioengineering, College of Engineering, North Carolina Agricultural and Technical State University, Greensboro, NC 27411, United States
| | - Jaela G Melton
- Department of Biology, College of Science and Technology, North Carolina Agricultural and Technical State University, Greensboro, NC 27411, United States
| | - Subhash C Pandey
- Center for Alcohol Research in Epigenetics, Department of Psychiatry, University of Illinois, Chicago, IL, United States; Jesse Brown VA Medical Center, Chicago, IL, United States
| | - H Scott Swartzwelder
- Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, 323 Foster St., Durham, NC 27701, United States
| | - Antoniette M Maldonado-Devincci
- Department of Psychology, Hairston College of Health and Human Sciences, North Carolina Agricultural and Technical State University, Greensboro, NC 27411, United States.
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Healey K, Waters RC, Knight SG, Wandling GM, Hall NI, Jones BN, Shobande MJ, Melton JG, Pandey SC, Scott Swartzwelder H, Maldonado-Devincci AM. Adolescent Intermittent Ethanol Exposure Alters Adult Exploratory and Affective Behaviors, and Cerebellar Grin2B Expression in C57BL/6J Mice. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.02.13.528396. [PMID: 36824954 PMCID: PMC9949091 DOI: 10.1101/2023.02.13.528396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Binge drinking is one of the most common patterns (more than 90%) of alcohol consumption by young people. During adolescence, the brain undergoes maturational changes that influence behavioral control and affective behaviors, such as cerebellar brain volume and function in adulthood. We investigated long-term impacts of adolescent binge ethanol exposure on affective and exploratory behaviors and cerebellar gene expression in adult male and female mice. Further, the cerebellum is increasingly recognized as a brain region integrating a multitude of behaviors that span from the traditional primary sensory-motor to affective functions, such as anxiety and stress reactivity. Therefore, we investigated the persistent effects of adolescent intermittent ethanol (AIE) on exploratory and affective behaviors and began to elucidate the role of the cerebellum in these behaviors through excitatory signaling gene expression. We exposed C57BL/6J mice to AIE or air (control) vapor inhalation from postnatal day 28-42. After prolonged abstinence (>34 days), in young adulthood (PND 77+) we assessed behavior in the open field, light/dark, tail suspension, and forced swim stress tests to determine changes in affective behaviors including anxiety-like, depressive-like, and stress reactivity behavior. Excitatory signaling gene mRNA levels of fragile X messenger ribonucleoprotein ( FMR1) , glutamate receptors ( Grin2a , Grin2B and Grm5 ) and excitatory synaptic markers (PSD-95 and Eaat1) were measured in the cerebellum of adult control and AIE-exposed mice. AIE-exposed mice showed decreased exploratory behaviors in the open field test (OFT) where both sexes show reduced ambulation, however only females exhibited a reduction in rearing. Additionally, in the OFT, AIE-exposed females also exhibited increased anxiety-like behavior (entries to center zone). In the forced swim stress test, AIE-exposed male mice, but not females, spent less time immobile compared to their same-sex controls, indicative of sex-specific changes in stress reactivity. Male and female AIE-exposed mice showed increased Grin2B (Glutamate Ionotropic Receptor NMDA Type Subunit 2B) mRNA levels in the cerebellum compared to their same-sex controls. Together, these data show that adolescent binge-like ethanol exposure altered both exploratory and affective behaviors in a sex-specific manner and modified cerebellar Grin2B expression in adult mice. This indicates the cerebellum may serve as an important brain region that is susceptible to long-term molecular changes after AIE. Highlights Adolescent intermittent ethanol (AIE) exposure decreased exploratory behavior in adult male and female mice.In females, but not males, AIE increased anxiety-like behavior.In males, but not females, AIE reduced stress reactivity in adulthood.These findings indicate sex differences in the enduring effects of AIE on exploratory and affective behaviors. Cerebellar Grin2B mRNA levels were increased in adulthood in both male and female AIE-exposed mice. These findings add to the small, but growing literature on behavioral AIE effects in mice, and establish cerebellar excitatory synaptic gene expression as an enduring effect of adolescent ethanol exposure.
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