Abstract
Among several serotonin receptors, the 5-HT2B is one of the less studied in the brain. Although this receptor is only weakly expressed in the nervous system, it appears to be involved in several biological mechanisms linked to neuropsychiatric dysfunctions and/or action of several drugs. Indeed, the selective serotonin reuptake inhibitors (SSRIs) act by blocking the serotonin transporter, but their acute and chronic effects are specifically blunted when the 5-HT2B receptor is pharmacologically blocked or when its gene is knocked-out. This lack of effect is also observed in mice submitted to chronic stress paradigms that induce depressive-like states. On the contrary, response to non-serotonergic antidepressants are conserved in mice lacking a functional 5-HT2B receptor. Recent studies have demonstrated that 5-HT2B receptors are expressed by serotonergic neurons, and that they can act as positive autoreceptors, counterbalancing the actions of the negative 5-HT1A autoreceptors. In addition, elegant studies confirm that it is the 5-HT2B autoreceptor that is required for SSRIs effects. All in all, the specific lack of responses to SSRIs exhibited by mice knocked-out for the 5-HT2B receptor make these animals an ideal model for the study of resistance to SSRIs antidepressants, a condition highly reported in clinics. Besides, the impaired response to serotonergic antidepressants, mice constitutively lacking the 5-HT2B receptor have increased basal levels of BDNF in the hippocampus. The “antidepressant-like phenotype” exhibited by these mice offers an interesting tool for the study of new molecules potentially acting as antidepressants.
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Abbreviations
- 5-Hydroxytryptamine, 5-HT:
-
Serotonin
- DRN:
-
Dorsal raphe nucleus
- FST:
-
Forced swimming test
- GIRK:
-
G protein-coupled inwardly-rectifying potassium channels
- KO:
-
Knock-out
- NSF:
-
novelty suppressed feeding
- SERT:
-
Serotonin transporter
- SNP:
-
Single-nucleotide polymorphism
- SSRIs:
-
Selective serotonin reuptake inhibitors
- TPH2:
-
Tryptophan hydroxylase
- UCMS:
-
Unpredictable chronic mild stress
- VMAT2:
-
Vesicular monoamine transporter
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Diaz, S.L. (2021). 5-HT2B Receptors and Antidepressants. In: Maroteaux, L., Monassier, L. (eds) 5-HT2B Receptors. The Receptors, vol 35. Springer, Cham. https://doi.org/10.1007/978-3-030-55920-5_21
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