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New strategy develops 2 prototype drugs against cancer, retinal diseases
Date:2/25/2010

HOUSTON -- A comprehensive drug development strategy that starts with extensive screening of potential targeting agents and then narrows down to a small-molecule prototype has yielded two potential drugs that block cancer-promoting pathways in novel ways, a team led by scientists at The University of Texas M. D. Anderson Cancer Center reports in two papers published back-to-back online at the Proceedings of the National Academies of Science.

"The conceptual advance here is to demonstrate how to go rapidly from screening to structural-functional analysis to drug prototype in a few years," said co-senior author Wadih Arap, M.D., Ph.D., of the David H. Koch Center at M. D Anderson.

"The practical outcome is a pair of new drug candidates, one that acts as a decoy to inhibit a cancer-promoting pathway and another that blocks angiogenesis, the development of new blood vessels, which has the potential to treat both cancer and retinopathies that cause blindness," said co-senior author Renata Pasqualini, Ph.D., also of the David H. Koch Center.

The strategy begins with the screening of millions of peptides short combinations of at least two amino acids, the building blocks of proteins. Once a peptide is found that binds the target, a durable drug called a peptidomimetic is made from short combinations of non-natural amino acids.

For proof of concept, the team targeted the epidermal growth factor receptor pathway (EGFR) and the vascular endothelial growth factor receptor pathway (VEGFR).

EGFR is overexpressed on the cell surfaces of a number of cancers, including lung, colon, and head and neck. Epidermal growth factor binds to the receptor and causes cells to divide. It is currently treated with two types of drugs, antibodies that block the receptor and small kinase inhibitors. VEGFR is overexpressed in the cancer vascular system and is central to the formation of new blood vessels (angiogenesis) that accompany
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Contact: Scott Merville
smerville@mdanderson.org
713-792-0661
University of Texas M. D. Anderson Cancer Center
Source:Eurekalert

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