Prolifération dendritique excessive et signalisation ERK élevée au cours du développement néonatal dans un modèle murin d'autisme

Titre original en anglais : Dendritic overgrowth and elevated ERK signaling during neonatal development in a mouse model of autism

Cette publication est incluse dans le projet « Contributions académiques de personnes autistes sur l’autisme ». un auteur·ice de cette publication est identifié·e comme autiste dans le projet.

À propos de la mention auteur·ice autiste

Cheng, N., Alshammari, F., Hughes, E., Khanbabaei, M., & Rho, J. M. (2017). Dendritic overgrowth and elevated ERK signaling during neonatal development in a mouse model of autism. PLOS ONE, 12(6), e0179409. https://doi.org/10.1371/journal.pone.0179409

Date de publication: 13/06/2017 Ajout dans AutiHub: 29/08/2026 Type: Article Langue de l’article: Anglais

Cette publication est intégrée dans AutiHub via :

Auteurs

Auteur·ices des publications
5
Auteur·ices de la publication identifié·es comme autistes
1 / 5 (20,0 %)

Résumé

Le trouble du spectre de l'autisme (ci-après désigné par « ASD ») est une affection neurodéveloppementale hétérogène caractérisée par une altération de la communication et des interactions sociales, ainsi que par des activités ou intérêts restreints et répétitifs. Des altérations de la connectivité des réseaux et de la fonction mnésique sont fréquemment observées chez les patients autistes, impliquant souvent l'hippocampe. Cependant, les changements spécifiques au cours du développement cérébral précoce conduisant à un fonctionnement perturbé restent largement inconnus. Nous avons ici étudié le développement de l'arborisation dendritique des neurones pyramidaux CA1 de l'hippocampe dans le modèle murin d'autisme BTBR T+tf/J (BTBR). Les souris BTBR présentent les caractéristiques comportementales définissant l'autisme et montrent également des troubles de l'apprentissage et de la mémoire. Nous avons constaté que, par rapport aux animaux témoins C57BL/6J (B6), les longueurs des dendrites apicales et basales étaient significativement plus grandes chez les animaux BTBR nouveau-nés. De plus, les dendrites basales des souris BTBR présentaient une complexité de ramifications plus élevée. En revanche, l'aire de la section transversale du soma était inchangée. En outre, nous avons observé une densité similaire de neurones pyramidaux CA1 et une épaisseur similaire de la couche neuronale entre les deux souches. Ainsi, il existait une prolifération excessive spécifique et compartimentalisée des dendrites au cours du développement précoce chez les animaux BTBR. L'analyse biochimique a en outre montré que la voie des kinases régulées par les signaux extracellulaires (ERK) était régulée à la hausse dans l'hippocampe des animaux BTBR nouveau-nés. Étant donné que la structure dendritique est essentielle à l'intégration et à la transmission de l'information, nos données suggèrent qu'une altération du développement des dendrites pourrait potentiellement contribuer à la fonction hippocampique et au comportement altérés observés dans le modèle BTBR, et que cela pourrait être lié à une activation accrue de la voie ERK.

Autism spectrum disorder (hereafter referred to as "ASD") is a heterogeneous neurodevelopmental condition characterized by impaired social communication and interactions, and restricted, repetitive activities or interests. Alterations in network connectivity and memory function are frequently observed in autism patients, often involving the hippocampus. However, specific changes during early brain development leading to disrupted functioning remain largely unclear. Here, we investigated the development of dendritic arbor of hippocampal CA1 pyramidal neurons in the BTBR T+tf/J (BTBR) mouse model of autism. BTBR mice display the defining behavioural features of autism, and also exhibit impaired learning and memory. We found that compared to control C57BL/6J (B6) animals, the lengths of both apical and basal dendrites were significantly greater in neonatal BTBR animals. Further, basal dendrites in the BTBR mice had higher branching complexity. In contrast, cross-sectional area of the soma was unchanged. In addition, we observed a similar density of CA1 pyramidal neurons and thickness of the neuronal layer between the two strains. Thus, there was a specific, compartmentalized overgrowth of dendrites during early development in the BTBR animals. Biochemical analysis further showed that the extracellular signal-regulated kinases (ERK) pathway was up-regulated in the hippocampus of neonatal BTBR animals. Since dendritic structure is critical for information integration and relay, our data suggest that altered development of dendrites could potentially contribute to impaired hippocampal function and behavior observed in the BTBR model, and that this might be related to increased activation of the ERK pathway.

Bibliographie citée par cette référence

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Références citées
105
Avec un DOI
104
Sans DOI, à partir du texte brut de la bibliographie
1
4 / 105 (3,8 %) références citées comprennent au moins une personne identifiée comme autiste.
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2 / 105 (1,9 %)
Références avec noms d’auteurices détectés
103 / 105 (98,1 %)
Sans nom d’auteurice détecté
2
Sans titre structuré
1
Sans identifiant stable
1
Références avec noms bruts d’auteurices restant à vérifier
1
Références avec problème de récupération des métadonnées externes
0
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Noms d’auteurices détectés dans la bibliographie citée
692
À partir du DOI ou de métadonnées externes
692
À partir du texte brut validé de la bibliographie
0
Noms bruts déjà validés
0
Noms bruts restant à vérifier
2
59 / 692 (8,5 %) noms sont associés à un·e auteurice déjà présent·e dans AutiHub. 633 / 692 (91,5 %) noms ne sont pas encore associés.
Noms associés à une personne identifiée comme autiste
4 / 692 (0,6 %)
Calculé sur l’ensemble des noms d’auteurices détectés dans la bibliographie citée. Parmi les noms associés à un·e auteurice déjà présent·e dans AutiHub : 4 / 59 (6,8 %). Personnes distinctes identifiées comme autistes : 2 / 618 (0,3 %).
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