hCMEC/D3 Cells

The HCMEC/D3 cell line represents an immortalized human cerebral microvascular endothelial cell line, extensively utilized in the study of the blood-brain barrier (BBB). This cell line was generated through the transduction of primary human cerebral microvascular endothelial cells with a lentiviral vector expressing human telomerase reverse transcriptase (hTERT), a crucial enzyme for maintaining telomere length and thereby promoting cellular longevity without transforming the cell phenotype. The introduction of hTERT helps these cells to bypass the replicative senescence that limits the lifespan of primary cells, allowing sustained propagation in culture. HCMEC/D3 cells retain key physiological and morphological characteristics of primary cerebral endothelial cells, making them a valuable model for in vitro studies of the BBB. These include the expression of tight junction proteins such as claudin-5, occludin, and zonula occludens-1, which are critical for maintaining barrier integrity. The cells also express various transporters and receptors typical of the cerebral endothelium, supporting their use in studies related to drug delivery and neurovascular disorders. The ability of HCMEC/D3 to form a tight monolayer with high electrical resistance underscores their suitability for BBB permeability assays. Research utilizing HCMEC/D3 cells has covered a wide range of applications, including the investigation of cerebral pathologies such as stroke, multiple sclerosis, and metastasis of cancer to the brain. Their compatibility with various molecular biology techniques also makes them an excellent tool for studying endothelial cell responses to inflammatory stimuli, shear stress, and neurotoxic substances. This cell line provides a robust, reproducible platform for dissecting the molecular events at the cerebral endothelial level, contributing valuable insights into the complexities of neurovascular health and disease.