PSMA mimotope isolated from phage displayed peptide library can induce PSMA specific immune response.
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.
Zhu
Z Y
ZY
Shanghai Institute of Cell Biology, Chinese Academy of Sciences.
Zhong
C P
CP
Xu
W F
WF
Lin
G M
GM
Ye
G Q
GQ
Ji
Y Y
YY
Sun
B
B
Yeh
M
M
D000818:Animals; D000951:Antigens, Neoplasm / Q000276:immunology* / Q000302:isolation & purification; D000954:Antigens, Surface; D002268:Carboxypeptidases / Q000276:immunology* / Q000302:isolation & purification; D002846:Chromatography, Affinity; D018985:Epitopes, B-Lymphocyte / Q000276:immunology; D043425:Glutamate Carboxypeptidase II; D006801:Humans; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018716:Molecular Mimicry; D019151:Peptide Library; D017430:Prostate-Specific Antigen / Q000032:analysis / Q000276:immunology*; D011471:Prostatic Neoplasms / Q000737:chemistry / Q000276:immunology; D017421:Sequence Analysis
D000951:Antigens, Neoplasm; D000954:Antigens, Surface; D018985:Epitopes, B-Lymphocyte; D019151:Peptide Library; D002268:Carboxypeptidases; C473848:FOLH1 protein, human; D043425:Glutamate Carboxypeptidase II; D017430:Prostate-Specific Antigen