Rabbit Corneal Endothelial Cells

Rabbit corneal endothelial cells (RCECs) form the single layer of neuroectoderm-derived cells lining the posterior corneal surface. A principal strength of RCECs is their ability to establish highly reproducible, contact-inhibited monolayers exhibiting the classic polygonal, predominantly hexagonal morphology. These cells develop well-organized apicolateral tight junctions, demarcated by continuous ZO-1 localization, and uniformly express the defining endothelial markers Na⁺/K⁺-ATPase, aquaporin-1, and N-cadherin, while retaining robust transendothelial electrical resistance. Crucially, unlike primary human corneal endothelial cells, which are notoriously post-mitotic and challenging to expand, RCECs—especially those derived from young rabbits—retain a marked intrinsic proliferative capacity. This permits transient expansion without immediate loss of phenotype, enabling mechanistic studies of cell cycle re-entry and regenerative repair that are difficult in human cells.

The rabbit origin confers substantial practical and translational benefits. The large eye size simplifies endothelial isolation, yielding abundant, highly pure cells free from stromal contamination. The controlled age and genetic uniformity of laboratory rabbits minimize donor variability, ensuring experimental consistency. Furthermore, the direct alignment with established rabbit models of corneal endothelial injury, cryoinjury, and Descemet membrane transplantation enables seamless in vitro–in vivo correlation. Together, these features establish primary RCECs as a cost-effective, ethically accessible, and physiologically faithful platform for investigating endothelial pathophysiology, drug toxicity, and tissue-engineering strategies.