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This study was designed to examine the role of flavin-containing monooxygenase (FMO) on the auditory and vestibular neurotoxicity of 3,3'-iminodipropionitrile (IDPN) using the FMO substrate and competitive inhibitor methimazole (MMI). Specifically, the purpose was to block the FMO-mediated conversion of IDPN to the putative neurotoxic metabolite N-hydroxy3,3'-iminodipropionitrile (HOIDPN). In three separate experiments, adult male Long-Evans hooded rats were administered (ip) saline (vehicle), MMI, IDPN, or HOIDPN individually, or a combination of IDPN and MMI or HOIDPN and MMI. Animals were observed daily for signs of the ECC syndrome (excitation with choreiform and circling movements) for 10 days. One to 2 weeks after exposure, a battery of behavioral tests was used to examine vestibular and auditory function. MMI completely blocked the neurotoxicity associated with a 600 mg/kg dose of IDPN and partially blocked the effects of a 1000 mg/kg dose of IDPN. In contrast, MMI failed to block, and instead increased, the neurotoxicity associated with HOIDPN. These data suggest that FMO-mediated metabolism of IDPN is necessary for the generation of a metabolite responsible for the vestibular and auditory neurotoxicities.

Effect of Methimazole, an FMO Substrate and Competitive Inhibitor, on the Neurotoxicity of 3,3′-Iminodipropionitrile in Male Rats