Exogenous expression of claudin‐5 induces barrier properties in cultured rat brain capillary endothelial cells

Abstract
Claudins are thought to be major components of tight junctions (TJs), and claudin‐5 and ‐12 are localized at TJs of the blood‐brain barrier (BBB). Claudin‐5‐deficient mice exhibit size‐selective (14C]inulin at a TR‐BBB/CLD5 cell monolayer was significantly smaller (P < 0.01) than that for the parental TR‐BBB cells, and the values of the permeability coefficient (Pe) were 1.14 × 10−3 and 11.6 × 10−3 cm/min, respectively. These results indicate that claudin‐5, but not claudin‐12, is predominantly expressed in brain capillaries, and plays a key role in the appearance of barrier properties of brain capillary endothelial cells. J. Cell. Physiol. 210: 81–86, 2007.

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