11C]dihydrotetrabenazine Positron Emission Tomography in Manganese-Exposed Workers

Susan R. Criswell, Susan Searles Nielsen, Mark N. Warden, Joel S. Perlmutter, Stephen M. Moerlein, Lianne Sheppard, Jason Lenox-Krug, Harvey Checkoway, Brad A. Racette

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

OBJECTIVE: To understand the neurotoxic effects of manganese (Mn) exposure on monoaminergic function, utilizing [C]dihydrotetrabenazine (DTBZ) positron emission tomography (PET) to measure vesicular monoamine transporter 2 (VMAT2). METHODS: Basal ganglia and thalamic DTBZ binding potentials (BPND) were calculated on 56 PETs from 41 Mn-exposed workers. Associations between cumulative Mn exposure, regional BPND, and parkinsonism were examined by mixed linear regression. RESULTS: Thalamic DTBZ BPND was inversely associated with exposure in workers with less than 3 mg Mn/m-yrs, but subsequently remained stable. Pallidal DTBZ binding increased in workers with less than 2 mg Mn/m-yrs of exposure, but decreased thereafter. Thalamic DTBZ binding was inversely associated with parkinsonism (P = 0.003). CONCLUSION: Mn-dose-dependent associations with thalamic and pallidal DTBZ binding indicate direct effects on monoaminergic VMAT2. Thalamic DTBZ binding was also associated with parkinsonism, suggesting potential as an early biomarker of Mn neurotoxicity.

Original languageEnglish
Pages (from-to)788-794
Number of pages7
JournalJournal of occupational and environmental medicine
Volume62
Issue number10
DOIs
StatePublished - Oct 1 2020

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