Sodium-dependent dopamine transporter (DAT) (DAT)

The Sodium-dependent dopamine transporter (DAT) is a critical transmembrane protein located on the presynaptic terminals of dopaminergic neurons, primarily in the striatum. Its fundamental biological role is to mediate the reuptake of dopamine from the synaptic cleft back into the neuron, thereby terminating the neural signal and maintaining neurotransmitter homeostasis [1][3]. By controlling the duration and intensity of dopamine signaling, DAT regulates key functions such as motor control, reward, and executive function [4]. Dysregulation of DAT is a hallmark of several neurological and psychiatric conditions; for instance, a significant loss of DAT density is a diagnostic indicator of Parkinson's disease, while variations in its expression are associated with ADHD [1][2]. From a pharmacological perspective, DAT is a major therapeutic target for stimulants like methylphenidate used in ADHD and is also the primary site of action for psychostimulants like cocaine and amphetamines, which exploit the transporter to cause massive increases in synaptic dopamine [5][6]. [1] UniProt P23975; [2] NIH/NCBI Gene ID 6531; [3] StatPearls: Physiology, Dopamine Transporter; [4] PMID: 21323906; [5] PubChem Compound: Methylphenidate; [6] PMID: 15305244.

Other names

SLC6A3Dopamine transporter 1DAT1Dopamine reuptake pump

Drugs targeting this molecule primarily act as reuptake inhibitors, which block the transporter and increase the concentration of dopamine in the synaptic cleft. Certain ligands, such as amphetamines, also act as substrates that induce the reversal of transport (efflux), further increasing extracellular dopamine levels [2][3][5].