Characterization and Visualization of Murine Coagulation Factor VIII-producing Cells in Vivo
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Coagulation factors are produced from hepatocytes, whereas production of coagulation factor VIII (FVIII) from primary tissues and cell species is still controversial. Here, we tried to characterize primary FVIII-producing organ and cell species using genetically engineered mice, in which enhanced green fluorescent protein (EGFP) was expressed instead of the F8 gene. EGFP-positive FVIII-producing cells existed only in thin sinusoidal layer of the liver and characterized as CD31, CD146, and lymphatic vascular endothelial hyaluronan receptor 1 (Lyve1). EGFP-positive cells can be clearly distinguished from lymphatic endothelial cells in the expression profile of the podoplanin and C-type lectin-like receptor-2 (CLEC-2). In embryogenesis, EGFP-positive cells began to emerge at E14.5 and subsequently increased according to liver maturation. Furthermore, plasma FVIII could be abolished by crossing F8 conditional deficient mice with Lyve1-Cre mice. In conclusion, in mice, FVIII is only produced from endothelial cells exhibiting CD31, CD146, Lyve1, CLEC-2, and podoplanin in liver sinusoidal endothelial cells.
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