Endogenous tissue factor pathway inhibitor in vascular smooth muscle cells inhibits arterial thrombosis

Abstract

Tissue factor pathway inhibitor (TFPI) is the main inhibitor of tissue factor-mediated coagulation. TFPI is expressed by endothelial and smooth muscle cells in the vasculature. Endothelium-derived TFPI has been reported to play a regulatory role in arterial thrombosis. However, the role of endogenous TFPI in vascular smooth muscle cells (VSMCs) in thrombosis and vascular disease development has yet to be elucidated. In this TFPI^Flox mice crossbred with Sma–Cre mice were utilized to establish TFPI conditional knockout mice and to examine the effects of VSMC-directed TFPI deletion on development, hemostasis, and thrombosis. The mice with deleted TFPI in VSMCs (TFPI^Sma) reproduced viable offspring. Plasma TFPI concentration was reduced 7.2% in the TFPI^Sma mice compared with TFPI^Flox littermate controls. Plasma TFPI concentration was also detected in the TFPI^Tie2 (mice deleted TFPI in endothelial cells and cells of hematopoietic origin) mice. Plasma TFPI concentration of the TFPI^Tie2 mice was 80.4% lower (P<0.001) than that of the TFPI^Flox mice. No difference in hemostatic measures (PT, APTT, and tail bleeding) was observed between TFPI^Sma and TFPI^Flox mice. However, TFPI^Sma mice had increased ferric chloride–induced arterial thrombosis compared with TFPI^Flox littermate controls. Taken together, these data indicated that endogenous TFPI from VSMCs inhibited ferric chloride–induced arterial thrombosis without causing hemostatic effects.

Keywords

arterial thrombosis / conditional knockout mice / tissue factor pathway inhibitor / vascular smooth muscle cells

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Acknowledgements

The authors would like to thank Junling Liu for his laboratory assistance. This study was supported by the National Natural Science Foundation of China (No. 81070104) and the Program of Shanghai Subject Chief Scientist (No.12XD1400600).

Compliance with ethics guidelines

Jichun Yang, Kaiyue Jin, Jiajun Xiao, Jing Ma, and Duan Ma declare that they have no conflict of interests associated with this study. All animal protocols were approved by the Institutional Committee for the Use and Care of Laboratory Animals of Fudan University.

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