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Manganese Toxicokinetics At The Blood-Brain Barrier, Robert A. Yokel, Janelle S. Crossgrove

Pharmaceutical Sciences Reports

Increased manganese (Mn) use in manufacturing and in gasoline has raised concern about Mn-induced parkinsonism. Previous research indicated carrier-mediated brain entry but did not assess brain efflux.

Using in situ rat brain perfusion, we studied influx across the blood-brain barrier (BBB) of three predominant plasma Mn species available to enter the brain: Mn²⁺, Mn citrate, and Mn transferrin. Our results suggested transporter-mediated uptake of these species. The uptake rate was greatest for Mn citrate. Our results using the brain efflux index method suggested that diffusion mediates distribution from rat brain to blood.

To characterize the carriers mediating brain …