Abstract
Blood vessels of tumors carry specific markers that are usually angiogenesis-related1,2. We previously used phage-displayed peptide libraries in vivo to identify peptides that home to tumors through the circulation and that specifically bind to the endothelia of tumor blood vessels3,4. Here we devised a phage screening procedure that would favor tumor-homing to targets that are accessible to circulating phage, but are not blood vessels. Screening on MDA-MB-435 breast carcinoma xenografts yielded multiple copies of a phage that displays a cyclic 9-amino-acid peptide, LyP-1. Homing and binding to tumor-derived cell suspensions indicated that LyP-1 also recognizes an osteosarcoma xenograft, and spontaneous prostate and breast cancers in transgenic mice, but not two other tumor xenografts. Fluorescein-labeled LyP-1 peptide was detected in tumor structures that were positive for three lymphatic endothelial markers and negative for three blood vessel markers. LyP-1 accumulated in the nuclei of the putative lymphatic cells, and in the nuclei of tumor cells. These results suggest that tumor lymphatics carry specific markers and that it may be possible to specifically target therapies into tumor lymphatics.
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Change history
01 July 2002
The supplementary info pieces that originally went up with the aop had incorrect figure legends. Editorial Production supplied new pieces and we put them up with the July issue.
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Acknowledgements
We thank E. Engvall and E. Pasquale for comments on the manuscript; K. Alitalo, H. Kubo, T. Petrova and M. Quintanilla for antibodies; M. Bernasconi and A. Man for tumor materials; F. Ferrer for peptide synthesis; and R. Newlin for assistance with histology. This study was supported by grants CA74238, CA82715, the Cancer Center Support Grant CA 30199 from the NCI, and grant 99-3339 from the Komen Foundation. P.L. is supported by fellowship 69768 from the Academy of Finland and a fellowship from the Finnish Cultural Foundation. J.A.H. is a recipient of a National Cancer Institute Training Grant fellowship in the Molecular Pathology of Cancer.
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Supplementary Fig. B
The legends to the Supplementary Figures A and B that were originally published AOP on 10 June 2002, were inadvertantly transposed. The present version of the figures is correct. (PDF 615 kb)
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Laakkonen, P., Porkka, K., Hoffman, J. et al. A tumor-homing peptide with a targeting specificity related to lymphatic vessels. Nat Med 8, 751–755 (2002). https://doi.org/10.1038/nm720
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DOI: https://doi.org/10.1038/nm720
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