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Development of tissue-specific histamine-responsive vascular endothelial models using a collagen vitrigel membrane

The tightness of the endothelial barrier is tissue-dependent. We expect that tissue-specific barrier function can be induced in immature vascular endothelial cells by co-culturing with tissue-specific cells. The purpose of this study is to construct tissue-specific vascular endothelial models on a collagen vitrigel membrane (CVM) composed of highdensity collagen fibrils equivalent to connective tissues in vivo and compare the responsivity to histamine. We used human microvascular endothelial cells (HMVECs) derived from a newborn foreskin. HMVECs were cultured in a CVM chamber with or without human dermal fibroblasts (HDFs), C6 cells (a rat glioma cell line) or HepG2-NIAS cells (a human hepatocellular carcinoma cell line) cultured on the reverse-side of CVM for up to 6 days. The endothelial barrier function was evaluated by transendothelial electric resistance (TEER). TEER values of a HMVEC monolayer were 15-20 Ω/cm during culture periods. It significantly increased up to 40-60 Ω/cm by co-culturing with HDFs, C6 cells and HepG2-NIAS cells. Also, TEER value was clearly decreased in the co-culture model composed of HMVECs and HDFs treated with 1 μM histamine while HMVEC monolayer model showed slight response to 100 μM histamine. Now we are investigating tissue-specific responses to histamine among the models. Poster Sessions