| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
The stratum corneum (SC) and tight junctions (TJs) form physical barriers in the skin. Impairment of SC and/or TJ barriers has been reported in atopic dermatitis skin, however, the direct consequence of TJ barrier dysfunction on dermatitis onset is unknown. In this study, we established tamoxifen (TAM)-inducible epidermis-specific claudin-1–knockout mice and investigated the pathophysiology of primary epidermal TJ defects in adult mice.
TJ leakage was initially observed focally on day 4 after TAM injection, and had developed fully on day 8. By contrast, the elevation of transepidermal water loss (TEWL) commenced later, on day 10, and reached its peak by day 18. The dermatitis phenotype, including erythema with scales, also became apparent on day 18. Water evaporation through the isolated SC sheets was normal on day 8 but significantly increased on day 18. Therefore, SC barrier impairment and TEWL elevation were secondarily induced after TJ leakage in this mouse model.
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