Solute carrier family 6 (SLC6)

The Monoamine and GABA transporters are a group of integral membrane proteins belonging to the Solute Carrier Family 6 (SLC6), also known as the Neurotransmitter:Sodium Symporter (NSS) family [1, 2]. This family includes the serotonin (SERT), dopamine (DAT), and norepinephrine (NET) transporters, as well as the GABA transporters (GAT-1, GAT-2, GAT-3) [1, 8]. These proteins are primarily located on the presynaptic membranes of neurons and on glial cells, where they facilitate the reuptake of neurotransmitters from the synaptic cleft back into the cell [6, 7]. This reuptake mechanism is driven by the electrochemical gradient of sodium and chloride ions and is the primary means of terminating neurotransmitter signaling [3, 12]. Dysregulation of these transporters is linked to various neuropsychiatric conditions, including major depressive disorder, anxiety, and attention-deficit/hyperactivity disorder (ADHD) [8, 17]. Pharmacological agents targeting these transporters, such as selective serotonin reuptake inhibitors (SSRIs) and stimulants like methylphenidate, are widely used to treat these disorders by increasing the availability of neurotransmitters in the synapse [6, 14]. Additionally, these transporters are the primary sites of action for psychostimulants such as cocaine and amphetamines, which increase extracellular neurotransmitter levels by inhibiting reuptake or inducing reverse transport [14]. However, these targets are also associated with safety concerns such as serotonin syndrome and a high potential for abuse in the case of certain stimulants [14, 22]. Understanding the structural and functional properties of these transporters remains a key area of research for developing more selective and effective neuropsychiatric medications [8, 13].

Other names

Monoamine and GABA transportersNeurotransmitter:sodium symporter familyNSS familyNa+/Cl--dependent transporter familySolute carrier family 6 members

Inhibition of neurotransmitter reuptake from the synaptic cleft into the presynaptic neuron or glia, thereby increasing extracellular neurotransmitter concentrations and prolonging signaling effects; certain stimulants also induce substrate-mediated neurotransmitter efflux.