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Molecules 2011, 16(1), 900-914; doi:10.3390/molecules16010900
Article

Efficient In Vivo Selection of a Novel Tumor-Associated Peptide from a Phage Display Library

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Received: 15 December 2010 / Revised: 14 January 2011 / Accepted: 18 January 2011 / Published: 21 January 2011
(This article belongs to the Special Issue Phage Display of Combinatorial Libraries)
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Abstract

We developed a screening procedure to identify ligands from a phage display random peptide library that are selective for circulating bone marrow derived cells homing to angiogenic tumors. Panning the library on blood outgrowth endothelial cell suspension in vitro followed by in vivo selection based on homing of bone marrow-bound phage to angiogenic tumors, yielded the peptide QFPPKLTNNSML. Upon intravenous injection phage displaying this peptide homed to Lewis lung carcinoma (LLC) tumors in vivo whereas control phage did not localize to tumor tissue. Phage carrying the QFPPKLTNNSML peptide labeled with 64Cu radionuclide when administered intravenously into a tumor bearing mouse was detected noninvasively with positron emission tomography (PET) around the tumor. These proof-of-principle experiments demonstrate the ability of the QFPPKLTNNSML peptide to deliver payload (radiolabeled phage conjugates) in vivo to sites of ongoing angiogenesis and point to its potential clinical utility in a variety of physiologic and pathologic processes where neovascular growth is a critical component.
Keywords: in vivo phage display; circulating bone marrow derived tumor homing cells; tumor-associated peptides; targeting neovascular growth; positron emission tomography (PET) imaging in vivo phage display; circulating bone marrow derived tumor homing cells; tumor-associated peptides; targeting neovascular growth; positron emission tomography (PET) imaging
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Veleva, A.N.; Nepal, D.B.; Frederick, C.B.; Schwab, J.; Lockyer, P.; Yuan, H.; Lalush, D.S.; Patterson, C. Efficient In Vivo Selection of a Novel Tumor-Associated Peptide from a Phage Display Library. Molecules 2011, 16, 900-914.

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