-In classic monolayer cell culture, the world is flat. In contrast, tissue-embedded cells experience a threedimensional context to interact with. We assessed a selection of natural gelling agents of non-animal origin (ι-and κ-carrageenan, gellan gum, guar gum, locust bean gum, sodium alginate, tragacanth and xanthan gum) in serum-free medium at 1-4% (w/v) concentration for their suitability as a more natural 3D culture environment for brain-derived cells. Their biophysical properties (viscosity, texture, transparency, gelling propensity) resemble those of the extracellular matrix (ECM). Gels provide the neurons with a 3D scaffold to interact with and allow for an increase of the overall cell density compared to classical monolayer 2D culture. They not only protect neurons in cell culture from shear forces and medium evaporation, but stabilize the microenvironment around them for efficient glial proliferation, tissue-analog neural differentiation and neural communication. We report on their properties (viscosity, transparency), their ease of handling in a cell culture context and their possible use modalities (cell embedment, as a cell cover or as a cell culture substrate). Among the selected gels, guar gum and locust bean gum with intercalated laminin allowed for cortical cell embedment. Neurons plated on and migrating into gellan gum survived and differentiated even without the addition of laminin. Sodium alginate with laminin was a suitable cell cover. Finally, we exemplarily demonstrate how guar gum supported the functional survival of a cortical culture over a period of 79 days in a proof-of-concept long-term microelectrode array (MEA) electrophysiology study.Keywords: Microbial-, plant-and algae-derived gelling agents / 3D neural cell culture / microelectrode array electrophysiology Résumé -Comparaison sélective d'agents gélifiants utilisés en tant matrices de cultures de cellules neurales en 3 dimensions pour une approche à long terme d'électrophysiologie. Au contraire de la culture classique pratiquée en monocouche (2D), la culture cellulaire en 3 dimensions (3D) permet de reproduire les interactions entre cellules d'un tissu. Nous avons évalué une sélection d'agents gélifiants naturels d'origine non animale (ι-et κ-carraghénane, gomme gellane, gomme de guar, gomme de caroube, alginate de sodium, gomme adragante et gomme de xanthane) dans un milieu sans sérum à des concentrations de 1-4 % (w/v) au regard de leur aptitude à offrir un milieu de culture 3D plus naturel pour les cellules cérébrales. Les propriétés biophysiques de ces agents (viscosité, texture, transparence, propension de gélification) ressemblent à celles de la matrice extracellulaire. Les gels fournissent aux neurones un assemblage 3D pour interagir et permettre une augmentation de la densité cellulaire globale, comparativement à une culture monocouche 2D classique. Ils protègent non seulement les neurones en culture cellulaire des forces de cisaillement et de l'évaporation moyenne, mais stabilisent également le micro-environnement...