Noninvasive Assessment of Angiogenesis by Ultrasound and Microbubbles Targeted to α v -Integrins

Author:

Leong-Poi Howard1,Christiansen Jonathan1,Klibanov Alexander L.1,Kaul Sanjiv1,Lindner Jonathan R.1

Affiliation:

1. From the Cardiovascular Imaging Center, Cardiovascular Division, University of Virginia, Charlottesville.

Abstract

Background— Noninvasive methods for characterizing neovessel formation during angiogenesis are currently lacking. We hypothesized that angiogenesis could be imaged with the use of contrast-enhanced ultrasound (CEU) with microbubbles targeted to α v -integrins. Methods and Results— Microbubbles targeted to α v -integrins were prepared by conjugating echistatin (MB E ) or monoclonal antibody against murine α v (MB α ) to their surface. Control microbubbles (MB c ) were also prepared. The microvascular behavior of these microbubbles was assessed by intravital microscopy of the cremaster muscle in mice treated for 4 days with sustained-release FGF-2. Microvascular retention was much greater ( P <0.01) for MB E (11±6 mm −3 ) and MB α (10±7 mm −3 ) than that for MB c (1±1 mm −3 ). Retained MB E and MB α attached directly to the microvascular endothelial surface. Microbubble retention in 4 control mice was minimal. Subcutaneous matrigel plugs enriched with FGF-2 were created in 12 mice and studied 10 days later. Neovessels within the matrigel stained positive for α v -integrins. CEU demonstrated greater ( P <0.01) acoustic intensity for MB E (16.0±5.9 U) and MB α (17.0±5.5 U) compared with MB c (5.8±2.6 U). The signal from targeted microbubbles (MB E and MB α ) correlated well ( r =0.90) with the matrigel blood volume determined by CEU perfusion imaging. Conclusions— CEU with microbubbles targeted for α v -integrins may provide a noninvasive method for assessing therapeutic angiogenesis.

Publisher

Ovid Technologies (Wolters Kluwer Health)

Subject

Physiology (medical),Cardiology and Cardiovascular Medicine

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