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(Circulation. 2004;110:2424-2429.)
© 2004 American Heart Association, Inc.

Molecular Cardiology

Adenoviral Gene Transfer With Soluble Vascular Endothelial Growth Factor Receptors Impairs Angiogenesis and Perfusion in a Murine Model of Hindlimb Ischemia

Johannes Jacobi, MD; Betty Y.Y. Tam, PhD; Grace Wu, BS; Jana Hoffman, PhD; John P. Cooke, MD, PhD; Calvin J. Kuo, MD, PhD

From the Divisions of Cardiovascular Medicine (J.J., J.P.C.) and Hematology (B.Y.Y.T., G.W., J.H., C.J.K.), Stanford University School of Medicine, Stanford, Calif.

Correspondence to Calvin J. Kuo, MD, PhD, Stanford University School of Medicine, Division of Hematology, CCSR 3105, Stanford, CA 94305-5156. E-mail cjkuo{at}stanford.edu

Received April 9, 2004; revision received August 9, 2004; accepted August 11, 2004.

Background— The purpose of the current study was to examine the contribution of endogenous vascular endothelial growth factor (VEGF) to ischemia-induced angiogenesis and perfusion.

Methods and Results— C57BL/6J mice (n=28) were subjected to unilateral hindlimb ischemia after intravenous injection of recombinant adenoviruses (10⁹ plaque-forming units) encoding the ligand-binding ectodomain of VEGF receptor 1 (VEGFR1/Ad Flt1), VEGF receptor 2 (VEGFR2/Ad Flk1-Fc), a control murine IgG2 Fc fragment (Ad Fc), or vehicle (phosphate-buffered saline). Hindlimb perfusion was assessed by both laser Doppler and fluorescent microsphere injection 10 days after surgery. The role of endogenous VEGF in ischemia-induced angiogenesis and arteriogenesis was measured by capillary density and microangiography, respectively. Adenoviral gene transfer with soluble VEGFRs significantly attenuated hindlimb perfusion as assessed by laser Doppler and microsphere analysis (P<0.05). Furthermore, soluble VEGFRs significantly reduced ischemia-induced angiogenesis and collateral growth and inhibited histological recovery of muscle tissue. Adverse events consistent with ongoing vascular insufficiency such as limb necrosis or gangrene were observed only in animals expressing soluble VEGFRs and not in control animals.

Conclusions— Systemic, soluble receptor–mediated VEGF inhibition indicates an essential role for endogenous VEGF during postischemic angiogenesis and hindlimb perfusion.

Key Words: collateral circulation • genetics • ischemia • angiogenesis • perfusion

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