Pharmaceutical Research

, Volume 28, Issue 10, pp 2422–2434 | Cite as

Identification of a LNCaP-Specific Binding Peptide Using Phage Display

  • Bin Qin
  • Wanyi Tai
  • Ravi S. Shukla
  • Kun Cheng
Research Paper



To identify a LNCaP-specific peptide using a phage display library and evaluate its potential applications in targeted drug delivery.


Binding abilities of selected phages were evaluated by cell phage ELISA. The KYL peptide encoded by the most specific phage clone was synthesized, labeled with fluorescein, and assayed in various cell lines. A fusion peptide composed of the KYL peptide and a proapoptotic peptide D (KLAKLAK)2 was synthesized, and the cell death effect was evaluated on different cells. Moreover, the KYL peptide was conjugated to a cationic protein, protamine, to explore its potential application in siRNA delivery.


One phage clone with a high binding affinity to LNCaP cells was identified. Cell phage ELISA and immunostaining demonstrated high specificity of this phage to LNCaP cells. The fluorescein-labeled KYL peptide exhibited higher binding to LNCaP cells in comparison to other cells. The fusion peptide composed of the KYL peptide and the proapoptotic peptide induced cell death in LNCaP cells, but not in PC-3 cells. The KYL peptide-protamine conjugate also efficiently delivered a fluorescein-labeled siRNA into LNCaP cells.


We identified a LNCaP-specific peptide and demonstrated its potential applications in targeted drug delivery to LNCaP cells.


LNCaP peptide ligand phage display prostate cancer siRNA 



This work was supported by awards from National Cancer Institute (NCI), NIH (1R21CA143683-01) and National Institute of Alcohol Abuse and Alcoholism (NIAAA), NIH (1R21AA017960-01A1). We also would like to express thanks for the financial support from a start-up package at the University of Missouri-Kansas City.


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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Bin Qin
    • 1
  • Wanyi Tai
    • 1
  • Ravi S. Shukla
    • 1
  • Kun Cheng
    • 1
  1. 1.Division of Pharmaceutical Sciences, School of PharmacyUniversity of Missouri-Kansas CityKansas CityUSA

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