REGULAR ARTICLESS

Cell Research (1999), 9, 271-280

PSMA mimotope isolated from phage displayed peptide library can induce PSMA specific immune response

ZHU Zhong Yu¹, Cui Ping ZHONG², Wei Feng XU¹, Guo Mei LIN¹, George QW YE³, Yong Yong JI¹, Bing SUN^1,*, Ming YEH^1,*

1. Shanghai Institute of Cell Biology, Chinese Academy of Sciences.
2. Department of Histology, Shanghai Medical University.
3. Yes Biotech Laboratories LTD, Canada

ABSTRACT

Prostate-specific membrane antigen (PSMA) is a cell surface glycoprotein expressed predominantly in prostate secretory acinar epithelium and prostate cancer cells as well as in several extraprostatic tissues. Mouse monoclonal antibody 4G5 specific to the extracellular domain of PSMA was used to screen two phage displayed peptide libraries (9aa linear and 9aa cys library). Three 4G5-reactive phagotopes were identified. Sequence analysis of isolated clones demonstrated that the interaction motif ``VDPA/SK" has high homology to 719-725aa on PSMA. Immunohistochemical staining of the prostate cancer sample with the PSMA-mimic phagotope (mimotope) immunized serum antibodies demonstrate that the mimotope isolated from the phage displayed peptide libraries can induce PSMA specific immune response in vivo.

Key words: PSMA, mimotope, phage displayed peptide library, immunohistochemistry.

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