# Protocol for the establishment and morphological characterization of long-term cultivated murine cerebral organoids

## TL;DR

This paper provides a detailed protocol for creating and analyzing long-term murine cerebral organoids to study brain development.

## Contribution

A novel protocol for generating and characterizing long-term murine cerebral organoids using E14.5 embryonic stem cells.

## Key findings

- A stepwise maturation process from neuroepithelial rosettes to cortical-like layers is described.
- Histological and immunofluorescence techniques enable detailed structural characterization of murine cerebral organoids.

## Abstract

Murine cerebral organoids provide a rapid and reproducible in vitro system that recapitulates key aspects of neurogenesis. While human cerebral organoid protocols are well established, methods for non-human models remain limited. Here, we present a protocol for generating long-term cultured murine cerebral organoids from E14.5 embryonic stem cells (ESCs). We describe steps for generating mature organoids, followed by histological processing including paraffin embedding and microtome sectioning. We then detail procedures for characterizing murine cerebral organoids through H&E staining and immunofluorescence techniques.

•Optimized B27-guided protocol for long-term murine cerebral organoids•Stepwise maturation from neuroepithelial rosettes to cortical-like layers•Serial sectioning with histology and IF enables structural characterization•Murine cerebral organoids as a model to complement in vivo studies

Optimized B27-guided protocol for long-term murine cerebral organoids

Stepwise maturation from neuroepithelial rosettes to cortical-like layers

Serial sectioning with histology and IF enables structural characterization

Murine cerebral organoids as a model to complement in vivo studies

Publisher’s note: Undertaking any experimental protocol requires adherence to local institutional guidelines for laboratory safety and ethics.

Murine cerebral organoids provide a rapid and reproducible in vitro system that recapitulates key aspects of neurogenesis. While human cerebral organoid protocols are well established, methods for non-human models remain limited. Here, we present a protocol for generating long-term cultured murine cerebral organoids from E14.5 embryonic stem cells (ESCs). We describe steps for generating mature organoids, followed by histological processing including paraffin embedding and microtome sectioning. We then detail procedures for characterizing murine cerebral organoids through H&E staining and immunofluorescence techniques.