Abstract
Environmental and occupational exposure to heavy metals remains one of the major concerns in public health. Increased levels of manganese (Mn) pollution are associated with profound neurotoxic effects, including neurobehavioral deficits and disturbances resembling Parkinson’s disease. While Mn absorption is in part mediated by iron transporters, recent studies have shown that the levels of iron transporters are modified by alcohol and that chronic alcohol consumption increases body iron stores. However, it is largely unexplored whether alcohol exposure influences the transport and neurotoxicity of Mn. To address this question, we exposed mice to ethanol (10%; v/v) by drinking water for 4 weeks, during which period MnCl2 (5 mg/kg) or saline solutions were administered daily by intranasal instillation. Ethanol consumption in mice increased brain Mn levels in a dose-dependent manner after Mn instillation, determined by inductively-coupled plasma mass spectrometry, which was accompanied by up-regulation of iron transporters, as assessed by western blotting and qPCR. In addition, alcohol drinking increased hypoxic response and decreased hepcidin expression, providing the molecular mechanism of increased iron transporters and Mn uptake upon alcohol consumption. Moreover, brain dopamine levels, analyzed by HPLC, were decreased after intranasal Mn instillation, which was worsened by alcohol. Likewise, alcohol-Mn co-exposure synergistically altered dopaminergic protein expression. Finally, alcohol binge-drinking, which resembles alcohol drinking manner in humans, increased brain Mn content along with upregulation of iron transporters. Our study suggests that individuals who consume alcohol may have a higher risk of Mn neurotoxicity upon Mn exposure.
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Abbreviations
- BBB:
-
Blood–brain barrier
- CNS:
-
Central nervous system
- DAT:
-
Dopamine transporter
- DMT1:
-
Divalent metal transporter 1
- Fe:
-
Iron
- FPN:
-
Ferroportin
- HIF-1α:
-
Hypoxia-inducible factor-1 alpha
- HIF-2α:
-
Hypoxia-inducible factor-2 alpha
- HIF-1β:
-
Hypoxia-inducible factor-1 beta
- HO-1:
-
Heme oxygenase 1
- Mn:
-
Manganese
- Tf:
-
Transferrin
- TfR1:
-
Transferrin receptor 1
- TH:
-
Tyrosine hydroxylase
- Zn:
-
Zinc
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Acknowledgements
This work was supported in part by the NIH ES017781 (J.K.). We thank Drs. Samuel John Gatley, Mansoor Amiji, and Ramon Molina for their input and advice. We are grateful to Drs. Qi Ye and JuOae Chang and Ms. Jie Xue for help during animal experiments and support.
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Han, M., Böhlke, M., Maher, T. et al. Alcohol exposure increases manganese accumulation in the brain and exacerbates manganese-induced neurotoxicity in mice. Arch Toxicol 95, 3665–3679 (2021). https://doi.org/10.1007/s00204-021-03166-1
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DOI: https://doi.org/10.1007/s00204-021-03166-1