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Davidson CJ, Hannigan JH, Perrine SA, Bowen SE. Abuse-like toluene exposure during early adolescence alters subsequent ethanol and cocaine behavioral effects and brain monoamines in male mice. Neurotoxicol Teratol 2024; 101:107317. [PMID: 38199311 DOI: 10.1016/j.ntt.2023.107317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 12/01/2023] [Accepted: 12/28/2023] [Indexed: 01/12/2024]
Abstract
Currently, there is a gap in understanding the neurobiological impact early adolescent toluene exposure has on subsequent actions of other drugs. Adolescent (PND 28-32) male Swiss-Webster mice (N = 210) were exposed to 0, 2000, or 4000 ppm of toluene vapor for 30 min/day for 5 days. Immediately following the last toluene exposure (PND 32; n = 15) or after a short delay (PND 35; n = 15), a subset of subjects' brains was collected for monoamine analysis. Remaining mice were assigned to one of two abstinence periods: a short 4-day (PND 36) or long 12-day (PND 44) delay after toluene exposure. Mice were then subjected to a cumulative dose response assessment of either cocaine (0, 2.5, 5, 10, 20 mg/kg; n = 60), ethanol (0, 0.5, 1, 2, 4 g/kg; n = 60), or saline (5 control injections; n = 60). Toluene concentration-dependently increased locomotor activity during exposure. When later challenged, mice exposed previously to toluene were significantly less active after cocaine (10 and 20 mg/kg) compared to air-exposed controls. Animals were also less active at the highest dose of alcohol (4 g/kg) following prior exposure to 4000 ppm when compared to air-exposed controls. Analysis of monoamines and their metabolites using High Pressure Liquid Chromatography (HPLC) within the medial prefrontal cortex (mPFC), nucleus accumbens (NAc), dorsal striatum (dSTR), and ventral tegmental area (VTA) revealed subtle effects on monoamine or metabolite levels following cumulative dosing that varied by drug (cocaine and ethanol) and abstinence duration. Our results suggest that early adolescent toluene exposure produces behavioral desensitization to subsequent cocaine-induced locomotor activity with subtle enhancement of ethanol's depressive effects and less clear impacts on levels of monoamines.
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Affiliation(s)
- Cameron J Davidson
- Department of Psychology, Wayne State University, Detroit, MI, USA; School of Medicine, Department of Psychiatry and Behavioral Neurosciences, Wayne State University, Detroit, MI, USA.
| | - John H Hannigan
- Department of Psychology, Wayne State University, Detroit, MI, USA; School of Medicine, Department of Obstetrics & Gynecology, Wayne State University, Detroit, MI, USA; Merrill Palmer Skillman Institute for Child & Family Development, Wayne State University, Detroit, MI, USA; Center for Urban Responses to Environmental Stressors, Wayne State University, Detroit, MI, USA
| | - Shane A Perrine
- School of Medicine, Department of Psychiatry and Behavioral Neurosciences, Wayne State University, Detroit, MI, USA
| | - Scott E Bowen
- Department of Psychology, Wayne State University, Detroit, MI, USA; Center for Urban Responses to Environmental Stressors, Wayne State University, Detroit, MI, USA; School of Medicine, Department of Psychiatry and Behavioral Neurosciences, Wayne State University, Detroit, MI, USA.
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Zhvania MG, Pochkhidze N, Dashniani M, Tizabi Y, Japaridze N, Burjanadze M, Chilachava L. Short- and long-term effects of chronic toluene exposure on recognition memory in adolescent and adult male Wistar rats. Brain Res Bull 2022; 190:116-121. [PMID: 36156293 DOI: 10.1016/j.brainresbull.2022.09.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 09/17/2022] [Accepted: 09/20/2022] [Indexed: 11/16/2022]
Abstract
Abuse of toluene-containing volatile inhalants, particularly among youth, is of significant medical and social concern worldwide. Teenagers constitute the most abundant users of toluene and the majority of adult abusers of toluene started as teenagers. Although the euphoric and neurotoxic effects of acute toluene have been widely studied, lasting effects of chronic toluene exposure, especially in various age groups, have not been well investigated. In this study, we used adolescent and adult male Wistar rats to evaluate the short- and long-term effects of chronic toluene on various behaviors including cognitive function. Daily exposure to toluene (2000 ppm) for 40 days (5min/day) resulted in age-dependent behavioral impairments. Specifically, adolescent animals showed recognition memory impairment the day after the last exposure, which had normalized by day 90 post- exposure, whereas such impairment in adult animals was still evident at day 90 post-exposure. Our data suggest that age-dependent responses should be taken into consideration in interventional attempts to overcome specific detrimental consequences of chronic toluene exposure.
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Affiliation(s)
- Mzia G Zhvania
- School of Natural Sciences and Medicine, Ilia State University. 3/5 K. Cholokashvili Avenue,0162 Tbilisi, Georgia; Department of Brain Ultrastructure and Nanoarchitecture, Ivane Beritashvili Center of Experimental Biomedicine, 14 Gotua Street, 0160 Tbilisi, Georgia.
| | - Nino Pochkhidze
- School of Natural Sciences and Medicine, Ilia State University. 3/5 K. Cholokashvili Avenue,0162 Tbilisi, Georgia; Department of Brain Ultrastructure and Nanoarchitecture, Ivane Beritashvili Center of Experimental Biomedicine, 14 Gotua Street, 0160 Tbilisi, Georgia
| | - Manana Dashniani
- Department of Behavior and Cognitive Functions, Ivane Beritashvili Center of Experimental Biomedicine, 14 Gotua Street, 0160 Tbilisi, Georgia
| | - Yousef Tizabi
- Department of Pharmacology, Howard University College of Medicine, Washington, DC, USA
| | - Nadezhda Japaridze
- Department of Brain Ultrastructure and Nanoarchitecture, Ivane Beritashvili Center of Experimental Biomedicine, 14 Gotua Street, 0160 Tbilisi, Georgia; Medical School, New Vision University, 1A Evgeni Mikeladze Street, 0159 Tbilisi, Georgia
| | - Maia Burjanadze
- Department of Behavior and Cognitive Functions, Ivane Beritashvili Center of Experimental Biomedicine, 14 Gotua Street, 0160 Tbilisi, Georgia
| | - Lela Chilachava
- School of Natural Sciences and Medicine, Ilia State University. 3/5 K. Cholokashvili Avenue,0162 Tbilisi, Georgia
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Davidson CJ, Hannigan JH, Bowen SE. Effects of inhaled combined Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX): Toward an environmental exposure model. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2021; 81:103518. [PMID: 33132182 DOI: 10.1016/j.etap.2020.103518] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 10/14/2020] [Accepted: 10/15/2020] [Indexed: 06/11/2023]
Abstract
Combined environmental exposures to the volatile organic compounds (VOCs) Benzene, Toluene, Ethylbenzene, and Xylene (BTEX) pose clear risks to public health. Research into these risks is under-studied even as BTEX levels in the atmosphere are predicted to rise. This review focuses on the available literature using single- and combined-BTEX component inhaled solvent exposures in animal models, necessarily also drawing on findings from models of inhalant abuse and occupational exposures. Health effects of these exposures are discussed for multiple organ systems, but with particular attention on neurobehavioral outcomes such as locomotor activity, impulsivity, learning, and psychopharmacological responses. It is clear that animal models have significant differences in the concentrations, durations and patterns of exposure. Experimental evidence of the deleterious health and neurobehavioral consequences of exposures to the individual components of BTEX were found, but these effects were typically assessed using concentrations and exposure patterns not characteristic of environmental exposure. Future studies with animal models designed appropriately to explore combined BTEX will be necessary and advantageous to discovering health outcomes and more subtle neurobehavioral impacts of long-term environmental exposures.
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Affiliation(s)
| | - John H Hannigan
- Department of Psychology, Wayne State University, Detroit, MI, USA; Department of Obstetrics & Gynecology, Wayne State University, Detroit, MI, USA; Merrill Palmer Skillman Institute for Child & Family Development, Wayne State University, Detroit, MI, USA; Center for Urban Responses to Environmental Stressors, Wayne State University, Detroit, MI, USA
| | - Scott E Bowen
- Department of Psychology, Wayne State University, Detroit, MI, USA; Center for Urban Responses to Environmental Stressors, Wayne State University, Detroit, MI, USA.
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Lobzhanidze G, Japaridze N, Lordkipanidze T, Rzayev F, MacFabe D, Zhvania M. Behavioural and brain ultrastructural changes following the systemic administration of propionic acid in adolescent male rats. Further development of a rodent model of autism. Int J Dev Neurosci 2020; 80:139-156. [PMID: 31997401 DOI: 10.1002/jdn.10011] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 01/08/2020] [Accepted: 01/19/2020] [Indexed: 12/18/2022] Open
Abstract
Short chain fatty acids, produced as gut microbiome metabolites but also present in the diet, exert broad effects in host physiology. Propionic acid (PPA), along with butyrate and acetate, plays a growing role in health, but also in neurological conditions. Increased PPA exposure in humans, animal models and cell lines elicit diverse behavioural and biochemical changes consistent with organic acidurias, mitochondrial disorders and autism spectrum disorders (ASD). ASD is considered a disorder of synaptic dysfunction and cell signalling, but also neuroinflammatory and neurometabolic components. We examined behaviour (Morris water and radial arm mazes) and the ultrastructure of the hippocampus and medial prefrontal cortex (electron microscopy) following a single intraperitoneal (i.p.) injection of PPA (175 mg/kg) in male adolescent rats. PPA treatment showed altered social and locomotor behaviour without changes in learning and memory. Both transient and enduring ultrastructural alterations in synapses, astro- and microglia were detected in the CA1 hippocampal area. Electron microscopic analysis showed the PPA treatment significantly decreased the total number of synaptic vesicles, presynaptic mitochondria and synapses with a symmetric active zone. Thus, brief systemic administration of this dietary and enteric short chain fatty acid produced behavioural and dynamic brain ultrastructural changes, providing further validation of the PPA model of ASD.
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Affiliation(s)
- Giorgi Lobzhanidze
- School of Natural Sciences and Medicine, Ilia State University, Tbilisi, Georgia.,Department of Brain Ultrastructure and Nanoarchitecture, I. Beritashvili Center of Experimental Biomedicine, Tbilisi, Georgia
| | - Nadezhda Japaridze
- Department of Brain Ultrastructure and Nanoarchitecture, I. Beritashvili Center of Experimental Biomedicine, Tbilisi, Georgia.,Medical School, New Vision University, Tbilisi, Georgia
| | - Tamar Lordkipanidze
- School of Natural Sciences and Medicine, Ilia State University, Tbilisi, Georgia.,Department of Brain Ultrastructure and Nanoarchitecture, I. Beritashvili Center of Experimental Biomedicine, Tbilisi, Georgia
| | - Fuad Rzayev
- Laboratory of Electron Microscopy, Research Center of Azerbaijan Medical University, Baku, Azerbaijan
| | - Derrick MacFabe
- The Kilee Patchell-Evans Autism Research Group, London, ON, Canada.,Faculty of Medicine, Department of Microbiology, Center for Healthy Eating and Food Innovation, Maastricht University, Maastricht, the Netherlands
| | - Mzia Zhvania
- School of Natural Sciences and Medicine, Ilia State University, Tbilisi, Georgia.,Department of Brain Ultrastructure and Nanoarchitecture, I. Beritashvili Center of Experimental Biomedicine, Tbilisi, Georgia
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