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Blood, 15 July 2006, Vol. 108, No. 2, pp. 515-517.
Prepublished online as a Blood First Edition Paper on March 28, 2006; DOI 10.1182/blood-2005-11-4571.
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Submitted November 18, 2005
Accepted March 10, 2006
FVIII production by human lung microvascular endothelial cells
Marc Jacquemin*, Arne Neyrinck, Maria I Hermanns, Renaud Lavend'homme, Filip Rega, Jean-Marie Saint-Remy, Kathelijne Peerlinck, Dirk Van Raemdonck, and Charles J Kirkpatrick
Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium
Laboratory for Experimental Thoracic Surgery, Katholieke Universiteit Leuven, Leuven, Belgium
Institute of Pathology, Johannes Gutenberg University, Mainz, Germany
* Corresponding author; email: marc.jacquemin{at}med.kuleuven.be.
While extrahepatic factor VIII (FVIII) synthesis suffices for hemostasis, the extrahepatic production sites are not well defined. We therefore investigated the ability of the human lungs to produce FVIII. Lungs from heart-beating donors, declined for transplantation, were perfused and ventilated in an isolated reperfusion model for two hours. A progressive accumulation of FVIII and VWF was recorded in the perfusion medium in three out of four experiments. By contrast, factor V, fibrinogen and IgG levels remained constant during the perfusion period, indicating that the accumulation of FVIII and VWF was not due to diffusion from the intercellular medium into the vascular system. Purified human lung microvascular endothelial cells produced FVIII during at least two passages in vitro. Altogether, these data identify the lung endothelial cells as a FVIII production site in man.

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