Primary Mouse Choroidal Endothelial Cell Culture.

The study of choroidal endothelial cells is essential for understanding the pathological mechanisms underlying choroidal neovascularization and other vision-threatening disorders. Traditional methods for isolating and culturing primary endothelial cells often yield mixed populations or require specialized equipment, limiting their widespread use. Here, we present a straightforward protocol for isolating and culturing primary mouse choroidal endothelial cells. This protocol involves enzymatic digestion of choroidal tissue, magnetic-activated cell sorting (MACS) to enrich CD31⁺ endothelial cells, and optimized culture conditions to promote cell proliferation and maintain endothelial phenotype. The protocol is strategic, reproducible, and requires minimal specialized equipment, making it accessible for researchers across various fields. By providing a robust method for obtaining pure choroidal endothelial cell cultures, this protocol facilitates the study of cell-specific behaviors and responses, advancing research into choroidal vascular diseases. Key features • Describes a protocol for isolating mouse choroidal endothelial cells (mCECs) using Matrigel^TM-based explant culture followed by CD31⁺ cell enrichment. • Utilizes enzymatic dissociation with dispase and filtration to achieve a single-cell suspension, ensuring high cell yield and purity. • Confirms endothelial cell identity, enabling reliable downstream applications. • Supports experimental induction of endothelial-to-mesenchymal transition (EndMT) using mouse transforming growth factor β2 (TGFβ2), making it suitable for studying vascular remodeling processes.