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ANALYSIS OF PROSTATE SPECIFIC ANTIGEN AND α1-ANTICHYMOTRYPSIN INTERACTION USING ANTIPEPTIDE MONOCLONAL ANTIBODIES

Authors
Journal
The Journal of Urology
0022-5347
Publisher
Elsevier
Publication Date
Volume
165
Issue
1
Identifiers
DOI: 10.1097/00005392-200101000-00083
Keywords
  • Prostate Specific Antigen
  • Alpha 1-Antichymotrypsin
  • Peptides
  • Antibodies
  • Monoclonal
Disciplines
  • Biology

Abstract

Purpose The synthetic peptides E30D and D10P that correspond to prostate specific antigen (PSA) sequences 60-91 and 78-89, respectively, and contain the kallikrein loop were used to immunize mice to obtain anti-PSA monoclonal antibodies (mAbs). Materials and Methods Antipeptide mAb characteristics were studied using biosensor technology and enzyme-linked immunosorbent assay, and analyzing the mAb effects on PSA-α1-antichymotrypsin (ACT) complex formation and PSA enzymatic activity. Epitope mapping of these mAbs was performed using overlapping peptide synthesis on nitrocellulose membrane. Results Anti-E30D mAbs bound PSA coated on the solid phase only, whereas anti-D10P mAbs recognized PSA in detection as well as in capture. However, these mAbs appeared to be anti-total PSA mAbs. Anti-E30D and anti-D10P mAbs were directed against linear epitopes corresponding to residues H74-Y77 and N84-R88, respectively, of the PSA sequence. Anti-D10P mAb recognition of PSA and PSA-ACT complex was equimolar, although an existing molecular model suggested that the sequence corresponding to anti-D10P mAb epitope was involved in the interaction site of PSA with ACT. Furthermore, we were unable to inhibit the enzymatic activity of PSA as well as PSA-ACT complex formation. Finally, the epitope N84-R88 overlapped the cleavage site R85-F86 of PSA. Conclusions The linear anti-D10P mAb epitope is located outside of the PSA-ACT binding site. However, these mAbs may be of value for evaluating the presence of different molecular PSA forms in sera.

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