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Team “Neurogenesis and pathophysiology”. Neurocentre Magendie / Bordeaux Neurocampus:

The dentate gyrus (DG) of the hippocampus is one of the few mammalian brain structures where neurogenesis is maintained throughout the lifetime of individuals. Indeed the dentate granule cells (GCs), the main neuronal cell type in the DG, are generated via several distinct phases occurring during late embryogenesis, the early postnatal life, the juvenile period and throughout adulthood. Because of this continuous addition of new cells, the DG appears as a heterogeneous structure composed of different populations of granule neurons. Whether these different populations have similar or distinct structural and functional properties is still a matter of debate. Surprisingly, although most dentate GCs are generated during development, little was known about their properties compared to adult-born neurons. Nevertheless, it was generally admitted that these populations are morphologically indistinguishable once mature. However a detailed and extensive analysis of developmentally-born neurons was lacking for proper comparison.


In this study, we used in vivo electroporation to label dentate GCs generated in mouse embryos (E14.5) or in neonates (P0) and followed their morphological development up to 6 months after birth. Importantly, we highlight for the first time major morphological differences with GCs born during the juvenile period (P21) or during adulthood (P84). Importantly, we also identified different morphological parameters that can be used to predict the birthdate of granule neurons in adult brain sections. In addition, our data indicate that two other poorly studied populations of GCs in the DG, the semilunar and hilar granule cells are generated during the embryonic and the neonatal periods respectively. Thus, our findings provide new insights into the development of the different populations of granule neurons in the DG and open new questions regarding their function in the brain. Indeed, the dendritic tree determines the amount and specificity of inputs a neuron receives and is involved in sophisticated signal processing and neural computation. Consequently, mature dentate GCs born at embryonic, neonatal or adult stages might contribute differently to hippocampal function. Future analyses of the inputs and functional properties of the different populations of GCs using in vivo electroporation might help to address this controversial question.(Pictures : Thomas Kerloch, Nora Abrous, Emilie Pacary)

Dentate Granule Neurons Generated During Perinatal Life Display Distinct Morphological Features Compared With Later-Born Neurons in the Mouse Hippocampus. Thomas Kerloch, Solène Clavreul, Adeline Goron, Djoher Nora Abrous, Emilie Pacary. Cereb Cortex. 2018 Sep 12. doi: 10.1093/cercor/bhy224.





L'article Hippocampal CB1 Receptors Control Incidental Associations, une collaboration Bordeaux Neurocampus a fait l'objet d'un abstract video publié sur la chaine de Neuron, à voir ici : https://youtu.be/1qF2NUBylhA





Busquets-Garcia A, Oliveira da Cruz J, Terral G, Pagano Zottola AC, Soria-Gómez E, Contini A, Martin H, Redon B, Varilh M, Ioannidou C, Drago F, Massa F, Fioramonti X, Trifilieff P, Ferreira G*, Marsicano G* (2018).Hippocampal CB1 receptors control incidental associations. Neuron https://doi.org/10.1016/j.neuron.2018.08.014





Le travail des AP du centre a fait l'objet d'une interview publiée dans le N° du mois d'aout de la lettre Objectif Santé & Sécurité de l'Inserm.
Lire l'interview en page 3.





En page 6 du magazine, Émilie décrit ses découvertes sur le rôle de la protéine CaMKII dans la modulation de la migration neuronale. L'article peut être consulté ici : https://fr.calameo.com/read/005154450616c517dbd2a




Info générale
12/07/2018
ANR : et les lauréats 2018 sont...

5 projets de recherches retenus par l'ANR dans le cadre de l'appel à projets générique 2018 (et 4 en liste complémentaire). Bravo aux équipes du centre et en particulier à Nathalie Sans, Daniela Cota, Giovanni Marsicano, Cyril Herry, Cyril Dejean et Xavier Leinekugel. On croise les doigts pour Daniel Voisin, Émilie Pacary, Gwendal Le Masson et Luigi Bellocchio.




Info générale
29/06/2018
Promotions ITA Inserm

Les différentes campagnes de promotion s'achèvent à l'Inserm et la moisson est encore bonne pour nos collègues ITA : Dania Prendin par concours interne, Hélène Doat par la sélection professionnelle, et Mélanie Ginger, Catherine Adane et Jean-Baptiste Bernard à la promotion au choix. Bravo aux 5 lauréats de l'année et à tous ceux qui les ont aidé.




Info générale
07/06/2018
Congratulations to V. Garcia-Rivas for a 1000$ travel award to attend a EBPS workshop on Computation in Cambridge

EBPS workshop "Animal and Human Behavior: Using Computational Approaches to Build a Two-way Bridge" (Cambridge, July 2018)




Info générale
06/06/2018
Aline Desmedt dans Enquête de santé

Aline Desmedt est intervenu dans l'émission de France 5 pour expliquer son modèle d'étude du PTSD. Retrouvez son intervention au bout de 20'30".
https://www.france.tv/france-5/enquete-de-sante/516655-attentats-agressions-surmonter-le-traumatisme.html




Offre de poste
04/06/2018
Offre projet et bourse de thèse - INRA/CNRS Nouzilly
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Rôle des récepteurs OXTR à l’ocytocine et MOR aux opioïdes et de leurs interactions dans le contrôle du comportement social (voir pdf)