Arch Toxicol. 2022 Jan 06; doi: 10.1007/s00204-021-03202-0. Epub 2022 Jan 06.

Methanol-induced optic neuropathy: a still-present problem.

Archives of toxicology

Sławomir Liberski, Bartlomiej J Kaluzny, Jarosław Kocięcki

PMID: 34988610 DOI: 10.1007/s00204-021-03202-0

Abstract

Methanol-induced optic neuropathy (Me-ION) is a serious condition that may result in long-term or irreversible visual impairment or even blindness secondary to damage and loss of function of the optic nerve and retina. Me-ION shows a tendency to occur as mass poisonings around the world with a clear predilection for poor societies in developing countries. The main mechanism underlying the molecular basis of Me-ION is the inhibition of the mitochondrial oxidative phosphorylation process through the binding of the toxic metabolite of methanol-formic acid-with the key enzyme of this process-cytochrome c oxidase. However, other mechanisms, including damage to the eye tissues by oxidative stress causing the intensification of the oxidative peroxidation process with the formation of cytotoxic compounds, as well as an increase in the synthesis of pro-inflammatory cytokines and influence on the expression of key proteins responsible for maintaining cell homeostasis, also play an important role in the pathogenesis of Me-ION. Histopathological changes in the eye tissues are mainly manifested as the degeneration of axons and glial cells of the optic nerve, often with accompanying damage of the retina that may involve all its layers. Despite the development of therapeutic approaches, persistent visual sequelae are seen in 30-40% of survivors. Thus, Me-ION continues to be an important problem for healthcare systems worldwide.

© 2022. The Author(s).

Keywords: Methanol; Methanol-induced optic neuropathy; Methyl alcohol; Ocular toxicology; Optic nerve; Toxic optic neuropathy

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