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(Circulation. 2000;101:289.)
© 2000 American Heart Association, Inc.

Basic Science Reports

Thromboresistance of Balloon-Injured Porcine Carotid Arteries After Local Gene Transfer of Human Tissue Factor Pathway Inhibitor

Pierre Zoldhelyi, MD; Janice McNatt; Harnath S. Shelat, MS; Yasutaka Yamamoto, MD, PhD; Zhi-Qiang Chen, MD; James T. Willerson, MD

From the Wafic Said Molecular Cardiology and Gene Therapy Research Laboratory, Texas Heart Institute (P.Z., H.S.S., Y.Y., Z.-Q.C., J.T.W.) and the Department of Medicine (Cardiology), University of Texas-Houston Medical School (P.Z., J.M., H.S.S., Z.-Q.C., J.T.W.), Houston, Tex.

Correspondence to Pierre Zoldhelyi, Texas Heart Institute, MC 2-255, 1101 Bates St, Houston, TX 77030. E-mail zoldhely{at}aol.com

Background—Tissue factor pathway inhibitor (TFPI) is an endogenous inhibitor of factor Xa and the coagulant initiator complex tissue factor/factor VIIa.

Methods and Results—To study the effects of TFPI gene transfer on thrombus formation, balloon-injured porcine carotid arteries were treated locally with an adenovirus encoding human TFPI (Ad-TFPI) or control virus. Gene transfer of TFPI was confirmed by detection of human TFPI in the conditioned medium of porcine carotid arteries kept in culture after in vivo transduction. When carotid flow was measured with Doppler probe 5 days after surgery, cyclic flow variations (CFVs) developed in 7 of 8 control pigs after constriction of the injured carotid artery by 40%, and all control-treated arteries occluded after 70% constriction. In contrast, CFVs were observed in only 1 of 8 Ad-TFPI–treated pigs after 40% constriction, and only 3 of 8 occluded after constriction by 70% (P=0.0027 and P=0.007, respectively). None of the 5 TFPI-transduced arteries open after 70% constriction developed CFVs during an incremental epinephrine infusion.

Conclusions—Compared with baseline, systemic hemostatic variables and platelet aggregation were unimpaired, suggesting that TFPI gene transfer can prevent arterial thrombosis in the presence of severe shear stress and without detectable hemostatic impairment.

Key Words: angioplasty • cerebrovascular disorders • coagulation • genes • thrombosis

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