Immortalized Mouse Corneal Epithelial Cells

The corneal epithelium serves as the outermost barrier of the eye, providing a smooth refractive surface while protecting against pathogens, desiccation, and environmental insults. Mouse corneal epithelial cells (MCECs) are widely used to study corneal wound healing, stem cell niche biology, ocular surface homeostasis, and toxicological responses. However, primary MCECs present considerable experimental limitations: they exhibit a restricted proliferative lifespan, undergo rapid senescence in culture, and display phenotypic drift upon passaging. Moreover, isolation from mice is laborious and yields low cell numbers, impeding high-throughput or long-term mechanistic studies.

To circumvent these obstacles, immortalized mouse corneal epithelial cell lines have been established through stable transduction of immortalizing genes, most commonly Simian Virus 40 large T antigen (SV40T) or human telomerase reverse transcriptase (hTERT). This intervention inactivates key cell cycle checkpoints (p53/pRB pathways), enabling continuous proliferation while preserving the fundamental characteristics of their primary counterparts. Immortalized MCECs retain typical cobblestone epithelial morphology, express corneal-specific keratin pairs (K12/K5), and maintain functional intercellular junctions, including tight junctions (ZO-1, occludin) and desmosomes. Importantly, they demonstrate an intact barrier function, appropriate stratification potential under air-lift culture, and responsiveness to exogenous stimuli such as growth factors, cytokines, and chemical irritants.

The use of immortalized mouse corneal epithelial cells offers several distinct advantages: unlimited cell supply, batch-to-batch consistency, ease of genetic manipulation, and suitability for automated screening platforms. Consequently, this cell line provides a robust, reproducible, and ethically advantageous in vitro model for investigating corneal epithelial biology, toxicology, drug permeability, and the molecular mechanisms underlying ocular surface diseases, while eliminating the recurrent need for animal sacrifice.