Monoamine transporters (MATs)

Monoamine transporters, comprising the serotonin transporter (SERT), norepinephrine transporter (NET), and dopamine transporter (DAT), are integral membrane proteins belonging to the solute carrier family 6 (SLC6). Their primary biological function is the sodium- and chloride-dependent reuptake of biogenic amine neurotransmitters from the synaptic cleft back into the presynaptic neuron, which terminates synaptic transmission and allows for neurotransmitter recycling (Source: UniProt P31645, P23975, P23945). These transporters are essential for regulating mood, arousal, reward pathways, and cognitive functions. Dysregulation of monoamine transport is a hallmark of several neuropsychiatric conditions, including major depressive disorder, anxiety, and attention-deficit/hyperactivity disorder (ADHD), as well as neurodegenerative diseases like Parkinson's (Source: NIH/NCBI PMC4283621). Pharmacologically, these transporters are the primary targets for a wide array of drugs, including selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptake inhibitors (SNRIs), and stimulants like methylphenidate (Source: StatPearls - Physiology, Monoamine Transporters). By inhibiting these transporters, medications increase the synaptic concentration of neurotransmitters, thereby modulating postsynaptic signaling to achieve therapeutic effects. However, targeting these proteins also carries risks such as serotonin syndrome, cardiovascular stimulation, and potential for substance abuse, depending on the specific transporter profile affected.

Other names

Serotonin transporterNorepinephrine transporterDopamine transporterSLC6A4SLC6A2SLC6A3SERTNETDATMonoamine reuptake transporters

Inhibition of the reuptake of serotonin, norepinephrine, and/or dopamine from the synaptic cleft into the presynaptic neuron by binding to the respective transporter proteins (SERT, NET, DAT), thereby increasing the availability of these neurotransmitters for postsynaptic receptor binding (Source: StatPearls - SSRIs; PubMed PMC4283621).