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Neurotoxic properties of musk ambrette
Abstract:
Musk ambrette (2,6-dinitro-3-methoxy-4-tert-butyltoluene), a nitro-musk compound widely used as a fixative in fragrance formulations and found to a lesser degree in flavor compositions, produces hindlimb weakness when administered in the diet or applied to skin of rats for periods up to 12 weeks. Underlying neuropathologic changes consist of primary demyelination and distal axonal degeneration in selected regions of the central and peripheral nervous system. Murine neurological disease induced by musk ambrette occurs at doses well above estimated maximum daily human exposure. Lifetime experimental neurotoxicology studies using lower concentrations of musk ambrette for prolonged periods would be needed for the estimation of human risk.
Insights
Musk ambrette, a fragrance ingredient, caused hindlimb weakness and nerve damage in rats. Neurological effects occurred at high doses, but further study is needed to assess human risk.
Area of Science:
- Neurotoxicology
- Environmental Health
- Dermatology
Background:
- Musk ambrette (2,6-dinitro-3-methoxy-4-tert-butyltoluene) is a nitro-musk compound used in fragrances and flavors.
- Nitro-musks are known for their potential health effects, necessitating toxicological evaluation.
Purpose of the Study:
- To investigate the neurotoxic potential of musk ambrette.
- To characterize the neuropathological changes induced by musk ambrette exposure in a rodent model.
Main Methods:
- Rats were administered musk ambrette orally or dermally for up to 12 weeks.
- Neuropathological examination focused on the central and peripheral nervous systems to identify demyelination and axonal degeneration.
Main Results:
- Musk ambrette exposure led to hindlimb weakness in rats.
- Histopathological analysis revealed primary demyelination and distal axonal degeneration in specific neural regions.
- Observed neurological disease in mice occurred at doses significantly exceeding estimated human exposure levels.
Conclusions:
- Musk ambrette induces neurotoxic effects, including demyelination and axonal degeneration, in rodents.
- Current findings suggest a low risk to humans at typical exposure levels.
- Long-term studies with lower concentrations are recommended to fully assess chronic human exposure risks.