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(Arteriosclerosis, Thrombosis, and Vascular Biology. 2000;20:2689.)
© 2000 American Heart Association, Inc.

Thrombosis

Genetic Induction of a Releasable Pool of Factor VIII in Human Endothelial Cells

Jonathan B. Rosenberg; Judith S. Greengard; Robert R. Montgomery

From the Blood Research Institute (J.B.R., R.R.M.), The Blood Center of Southeastern Wisconsin, Milwaukee, Wisc; Department of Pediatrics (R.R.M.), Medical College of Wisconsin, Milwaukee, Wisc; Children’s Hospital of Wisconsin (R.R.M.), Milwaukee, Wisc; and Chiron Corporation (J.S.G.), Emeryville, Calif.

Correspondence to Robert R. Montgomery, MD, Department of Pediatrics, Medical College of Wisconsin, 8701 Watertown Plank Rd, Milwaukee, WI 53226. E-mail bob{at}bcsew.edu

Abstract—Although it is known that factor VIII (FVIII) plasma levels increase rapidly in response to a number of stimuli, the biological stimuli behind this release is less clear. Previously, we showed that FVIII can traffic together with von Willebrand factor (vWF) into storage granules in a pituitary tumor cell line, AtT-20; however, AtT-20 cells could not be used to address the release or functional activity of released FVIII. To investigate the regulated secretion of stored FVIII, endothelial cells with intact agonist-stimulated release pathways were used. Human umbilical vein endothelial cells (HUVECs) were transduced with retroviral FVIII construct [hFVIII(V)] to create a FVIII/vWF storage pool. Immunofluorescent staining of transduced cells demonstrated FVIII in Weibel-Palade bodies. In contrast, the transduction of hFVIII(V) into HT-1080 and HepG2 cells displayed FVIII only in the cytoplasm. We studied the regulated release of both FVIII and vWF from endothelial cells after agonist-induced stimulation and demonstrated a parallel release of FVIII and vWF proteins. This released FVIII was functionally active. Hence, endothelial cells transduced with hFVIII(V) store FVIII together with vWF in Weibel-Palade bodies , creating a releasable storage pool of both proteins. Because FVIII secretion can be physiologically regulated by agonists in culture, this may explain the pharmacological agonist-induced release of FVIII by drugs such as desmopressin in vivo and suggests vascular endothelium as a reasonable target of gene therapy of hemophilia A.

Key Words: factor VIII • von Willebrand factor • endothelial cells • agonist stimulation • hemostasis

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