Serotonin sensing by microglia conditions the proper development of neuronal circuits and of social and adaptive skills
Serotonin sensing by microglia conditions the proper development of neuronal circuits and of social and adaptive skills
Abstract The proper maturation of emotional and sensory circuits requires a fine tuning of serotonin (5-HT) level during early postnatal development. Consistently, dysfunctions of the serotonergic system have been associated with neurodevelopmental psychiatric diseases, including autism spectrum disorders (ASD). However, the mechanisms underlying the developmental effects of 5-HT remain partially unknown, one obstacle being the action of 5-HT on different cell types. Here, we focused on microglia, which play a role in brain wiring refinement, and we investigated whether the control of these cells by 5-HT is relevant for neurodevelopment and spontaneous behaviors. Since the main 5-HT sensor in microglia is the 5-HT2B receptor subtype, we prevented 5-HT signaling specifically in microglia by conditionally invalidating Htr2b gene in these cells. We observed that abrogating the serotonergic control of microglia neonatally impacts the phagolysosomal compartment of these cells and their proximity to synapses, and perturbs neuronal circuits maturation. Furthermore, this early ablation of microglial 5-HT2B receptors leads to adult hyperactivity in a novel environment and behavioral defects in sociability and flexibility. Importantly, we show that these behavioral alterations result from a developmental effect, since they are not observed when microglial Htr2b invalidation is induced later, at P30 onward. Thus, a primary alteration of 5-HT sensing in microglia, during a critical time window between birth and P30, is sufficient to impair social and flexibility skills. This link between 5-HT and microglia may explain the association between serotonergic dysfunctions and behavioral traits, like impaired sociability and inadaptability to novelty, which are prominent in several psychiatric disorders such as ASD.
Roumier Anne、D?ˉAndrea Ivana、Etienne Fanny、Maroteaux Luc、Heck Nicolas、B¨|chade Catherine、Rebsam Alexandra、Nieves-Rivera Nayadoleni、Le Magueresse Corentin、Albertini Giulia、Druart M¨|lanie
INSERM UMR-S 1270||Sorbonne Universit¨|||Institut du Fer ¨¤ MoulinINSERM UMR-S 1270||Sorbonne Universit¨|||Institut du Fer ¨¤ MoulinINSERM UMR-S 1270||Sorbonne Universit¨|||Institut du Fer ¨¤ MoulinINSERM UMR-S 1270||Sorbonne Universit¨|||Institut du Fer ¨¤ MoulinSorbonne Universit¨|||Institut de Biologie Paris-Seine (IBPS), UMR 8246 - NeurosciencesINSERM UMR-S 1270||Sorbonne Universit¨|||Institut du Fer ¨¤ MoulinINSERM UMR-S 1270||Sorbonne Universit¨|||Institut du Fer ¨¤ MoulinINSERM UMR-S 1270||Sorbonne Universit¨|||Institut du Fer ¨¤ MoulinINSERM UMR-S 1270||Sorbonne Universit¨|||Institut du Fer ¨¤ MoulinINSERM UMR-S 1270||Sorbonne Universit¨|||Institut du Fer ¨¤ MoulinINSERM UMR-S 1270||Sorbonne Universit¨|||Institut du Fer ¨¤ Moulin
基础医学神经病学、精神病学生物科学现状、生物科学发展
Roumier Anne,D?ˉAndrea Ivana,Etienne Fanny,Maroteaux Luc,Heck Nicolas,B¨|chade Catherine,Rebsam Alexandra,Nieves-Rivera Nayadoleni,Le Magueresse Corentin,Albertini Giulia,Druart M¨|lanie.Serotonin sensing by microglia conditions the proper development of neuronal circuits and of social and adaptive skills[EB/OL].(2025-03-28)[2025-05-17].https://www.biorxiv.org/content/10.1101/2022.03.09.483609.点此复制
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