Abstract：
:The neurotransmitter serotonin (5-hdroxytryptamine; 5-HT) has been implicated in the pathophysiology and treatment of major depression since the serendipitous discovery of antidepressant drugs in the 1950s. However, despite the generalised use of serotonin-enhancing drugs, such as the selective serotonin reuptake inhibitors (SSRIs) and the dual serotonin and norepinephrine reuptake inhibitors (SNRIs), the exact neurobiological mechanisms involved in the therapeutic action of these drugs are poorly understood. Better knowledge of these mechanisms may help to identify new therapeutic targets and to overcome the two main limitations of current treatments: reduced efficacy and slowness of action. Here I review the preclinical and clinical evidence supporting the involvement of different 5-HT receptors in the therapeutic action of antidepressant drugs. Presynaptic 5-HT(1A) and 5-HT(1B) autoreceptors play a major detrimental role in antidepressant treatments, as their activation by the excess of the active (extracellular) 5-HT fraction produced by serotonin transporter (SERT) blockade reduces presynaptic serotonergic function. Conversely, stimulation of postsynaptic 5-HT(1A) receptors in corticolimbic networks appears beneficial for the antidepressant action. The 5-HT(2) receptor family is also involved as 5-HT(2A/2C) receptor blockade improves the antidepressant action of SSRIs, and recent data suggest that 5-HT(2B) receptor activation enhances serotonergic activity. Less is known from the rest of postsynaptic 5-HT receptors. However, 5-HT(3) receptor blockade augments the 5-HT increase evoked by SERT inhibition, and 5-HT(4) receptor activation may have antidepressant effects on its own. Finally, blockade of 5-HT(6) and 5-HT(7) receptors appears also to augment the antidepressant effects of SERT inhibition.
journal_name
Pharmacol Therjournal_title
Pharmacology & therapeuticsauthors
Artigas Fdoi
10.1016/j.pharmthera.2012.09.006subject
Has Abstractpub_date
2013-01-01 00:00:00pages
119-31issue
1eissn
0163-7258issn
1879-016Xpii
S0163-7258(12)00208-2journal_volume
137pub_type
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