Biomolecules & Therapeutics

The Korean Society of Applied Pharmacology (한국응용약물학회)
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Toluene Inhalation Causes Early Anxiety and Delayed Depression with Regulation of Dopamine Turnover, 5-HT1A Receptor, and Adult Neurogenesis in Mice

  • Kim, Jinhee (College of Pharmacy and Institute of Pharmaceutical Sciences, CHA University) ;
  • Lim, Juhee (College of Pharmacy and Institute of Pharmaceutical Sciences, CHA University) ;
  • Moon, Seong-Hee (College of Pharmacy and Institute of Pharmaceutical Sciences, CHA University) ;
  • Liu, Kwang-Hyeon (BK21 Plus KNU Multi-Omics based Creative Drug Research Team, College of Pharmacy and Research Institute of Pharmaceutical Sciences, Kyungpook National University) ;
  • Choi, Hyun Jin (College of Pharmacy and Institute of Pharmaceutical Sciences, CHA University)
  • Received : 2020.04.08
  • Accepted : 2020.04.16
  • Published : 2020.05.01
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Abstract

Inhaled solvents such as toluene are of particular concern due to their abuse potential that is easily exposed to the environment. The inhalation of toluene causes various behavioral problems, but, the effect of short-term exposure of toluene on changes in emotional behaviors over time after exposure and the accompanying pathological characteristics have not been fully identified. Here, we evaluated the behavioral and neurochemical changes observed over time in mice that inhaled toluene. The mice were exposed to toluene for 30 min at a concentration of either 500 or 2,000 ppm. Toluene did not cause social or motor dysfunction in mice. However, increased anxiety-like behavior was detected in the short-term after exposure, and depression-like behavior appeared as delayed effects. The amount of striatal dopamine metabolites was significantly decreased by toluene, which continued to be seen for up to almost two weeks after inhalation. Additionally, an upregulation of serotonin 1A (5-HT1A) receptor in the hippocampus and the substantia nigra, as well as reduced immunoreactivity of neurogenesis markers in the dentate gyrus, was observed in the mice after two weeks. These results suggest that toluene inhalation, even single exposure, mimics early anxiety-and delayed depression-like emotional disturbances, underpinned by pathological changes in the brain.

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References

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