Background
The organic cation transporter 3 (OCT3) shows a broad expression pattern in the nervous system and has been detected in glial cells and neurons. Here, OCT3 serves as an additional high-capacity, low-affinity reuptake system for monoamine neurotransmitters such as norepinephrine, serotonin and dopamine, and therefore OCT-mediated uptake has been termed “uptake 2”.