Antidepressant actions of ketamine engage cell-specific translation via eIF4E

Autor: Angélica Torres-Berrío, Gareth M. Rurak, Mohammad J. Eslamizade, Natalina Salmaso, Danilo De Gregorio, Argel Aguilar-Valles, Agnieszka Skaleka, Martha Lopez-Canul, Nahum Sonenberg, Sara Bermudez, Jean-Claude Lacaille, Abdessattar Khlaifia, Gabriella Gobbi, Edna Matta-Camacho, Stephanie Simard
Přispěvatelé: Aguilar-Valles, A., De Gregorio, D., Matta-Camacho, E., Eslamizade, M. J., Khlaifia, A., Skaleka, A., Lopez-Canul, M., Torres-Berrio, A., Bermudez, S., Rurak, G. M., Simard, S., Salmaso, N., Gobbi, G., Lacaille, J. -C., Sonenberg, N.
Rok vydání: 2020
Předmět:
Zdroj: Nature. 590:315-319
ISSN: 1476-4687
0028-0836
DOI: 10.1038/s41586-020-03047-0
Popis: Effective pharmacotherapy for major depressive disorder remains a major challenge, as more than 30% of patients are resistant to the first line of treatment (selective serotonin reuptake inhibitors)1. Sub-anaesthetic doses of ketamine, a non-competitive N-methyl-d-aspartate receptor antagonist2,3, provide rapid and long-lasting antidepressant effects in these patients4–6, but the molecular mechanism of these effects remains unclear7,8. Ketamine has been proposed to exert its antidepressant effects through its metabolite (2R,6R)-hydroxynorketamine ((2R,6R)-HNK)9. The antidepressant effects of ketamine and (2R,6R)-HNK in rodents require activation of the mTORC1 kinase10,11. mTORC1 controls various neuronal functions12, particularly through cap-dependent initiation of mRNA translation via the phosphorylation and inactivation of eukaryotic initiation factor 4E-binding proteins (4E-BPs)13. Here we show that 4E-BP1 and 4E-BP2 are key effectors of the antidepressant activity of ketamine and (2R,6R)-HNK, and that ketamine-induced hippocampal synaptic plasticity depends on 4E-BP2 and, to a lesser extent, 4E-BP1. It has been hypothesized that ketamine activates mTORC1–4E-BP signalling in pyramidal excitatory cells of the cortex8,14. To test this hypothesis, we studied the behavioural response to ketamine and (2R,6R)-HNK in mice lacking 4E-BPs in either excitatory or inhibitory neurons. The antidepressant activity of the drugs is mediated by 4E-BP2 in excitatory neurons, and 4E-BP1 and 4E-BP2 in inhibitory neurons. Notably, genetic deletion of 4E-BP2 in inhibitory neurons induced a reduction in baseline immobility in the forced swim test, mimicking an antidepressant effect. Deletion of 4E-BP2 specifically in inhibitory neurons also prevented the ketamine-induced increase in hippocampal excitatory neurotransmission, and this effect concurred with the inability of ketamine to induce a long-lasting decrease in inhibitory neurotransmission. Overall, our data show that 4E-BPs are central to the antidepressant activity of ketamine. The antidepressant-like effects of ketamine in mice depend on the expression of specific eIF4E-binding proteins in excitatory and inhibitory neurons.
Databáze: OpenAIRE
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