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Experimental Therapeutics, Molecular Targets, and Chemical Biology |
Center for Molecular Imaging Research, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
Requests for reprints: Ralph Weissleder, Center for Molecular Imaging Research, Massachusetts General Hospital and Harvard Medical School, Building 149, 13th Street, Room 5403, Charlestown, MA 02129. Phone: 617-726-8226; Fax: 617-726-5708; E-mail: weisleder{at}helix.mgh.harvard.edu.
Methods that allow robust imaging of specific molecular targets and biological processes in vivo should have widespread applications in biology and clinical medicine. Here we use a quantitative, three-dimensional fluorescence-mediated tomographic technique (FMT) that enables rapid measurements of fluorochrome-based affinity tags in live xenograft models. We validate the method by showing its sensitivity in quantitating tumor angiogenesis and therapeutic modulation using an anti–vascular endothelial growth factor antibody. Furthermore, we show the feasibility of simultaneous multichannel measurements of distinct biological phenomena such as receptor tyrosine kinase expression and angiogenesis. FMT measurements can be done serially, with short imaging times and within the same live animal. The described method should be valuable for rapidly profiling biological phenomena in vivo.
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