Proteina transportadora de esteroides

Cocaine blocks DAT by binding directly to the transporter and reducing the rate of transport. [12] In contrast, amphetamine enters the presynaptic neuron directly through the neuronal membrane or through DAT, competing for reuptake with dopamine. Once inside, it binds to TAAR1 or enters synaptic vesicles through VMAT2 . When amphetamine binds to TAAR1, it reduces the firing rate of the postsynaptic neuron and triggers protein kinase A and protein kinase C signaling, resulting in DAT phosphorylation. Phosphorylated DAT then either operates in reverse or withdraws into the presynaptic neuron and ceases transport. When amphetamine enters the synaptic vesicles through VMAT2, dopamine is released into the cytosol. [15] [16] Amphetamine also produces dopamine efflux through a second TAAR1-independent mechanism involving CAMKIIα -mediated phosphorylation of the transporter, which putatively arises from the activation of DAT-coupled L-type calcium channels by amphetamine. [11]

Proteina transportadora de esteroides

proteina transportadora de esteroides

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