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research
Evaluation of Phage Display Discovered Peptides as Ligands for Prostate-Specific Membrane Antigen (PSMA)
Authors
A Ghosh
AC Pawlyk
+47 more
AM Quinn
CW Diehnelt
D Hessels
D Shen
DB Sodee
Duanwen Shen
E Basch
F Yi
Fei Xie
GA Lazar
H Liu
H Liu
H-S Lim
HD Agnew
IM Thompson
Irina U. Agoulnik
J Yu
JA Arter
JR Mesters
JR Newton
KA Noren
MI Davis
MI Milowsky
MJ Morris
MJ Morris
MJ Roobol
NH Bander
RK Nam
S Aggarwal
S Kim
S Minner
SE Lupold
SM Hillier
SR Banerjee
SR Banerjee
SR Banerjee
SR Banerjee
SS Chang
SZ Li
TJ Wigle
V Humblet
W. Barry Edwards
Y Chen
Y Chen
Y Chen
Z Xiao
ZY Zhu
Publication date
1 January 2013
Publisher
'Public Library of Science (PLoS)'
Doi
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on
PubMed
Abstract
The aim of this study was to identify potential ligands of PSMA suitable for further development as novel PSMA-targeted peptides using phage display technology. The human PSMA protein was immobilized as a target followed by incubation with a 15-mer phage display random peptide library. After one round of prescreening and two rounds of screening, high-stringency screening at the third round of panning was performed to identify the highest affinity binders. Phages which had a specific binding activity to PSMA in human prostate cancer cells were isolated and the DNA corresponding to the 15-mers were sequenced to provide three consensus sequences: GDHSPFT, SHFSVGS and EVPRLSLLAVFL as well as other sequences that did not display consensus. Two of the peptide sequences deduced from DNA sequencing of binding phages, SHSFSVGSGDHSPFT and GRFLTGGTGRLLRIS were labeled with 5-carboxyfluorescein and shown to bind and co-internalize with PSMA on human prostate cancer cells by fluorescence microscopy. The high stringency requirements yielded peptides with affinities KD∼1 μM or greater which are suitable starting points for affinity maturation. While these values were less than anticipated, the high stringency did yield peptide sequences that apparently bound to different surfaces on PSMA. These peptide sequences could be the basis for further development of peptides for prostate cancer tumor imaging and therapy. © 2013 Shen et al
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