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Separation of enzymatically active and inactive prostate-specific antigen (PSA) by peptide affinity chromatography
Ping Wu1, Ulf-Håkan Stenman, Miikka Pakkala
1Department of Clinical Chemistry, Helsinki University Central Hospital, Helsinki, Finland.
The Prostate
|February 18, 2004
Summary
Novel peptides effectively separate active prostate-specific antigen (PSA) from inactive forms. This advance aids in developing specific detection methods for active free PSA, a key prostate cancer marker.
Area of Science:
- Biochemistry
- Proteomics
- Cancer Biomarkers
Background:
- Prostate-specific antigen (PSA) is a crucial biomarker for prostate cancer.
- Novel PSA-binding peptides have been identified that enhance PSA enzymatic activity.
Purpose of the Study:
- To develop a method for separating enzymatically active and inactive forms of PSA.
- To assess the utility of PSA-binding peptides in affinity chromatography for PSA fractionation.
Main Methods:
- Chemical synthesis of PSA-binding peptides and derivatives.
- Preparation of a peptide-based affinity column.
- Fractionation of PSA from seminal plasma, serum, and LNCap cell culture medium.
Main Results:
- Approximately 67% of seminal plasma PSA bound to the peptide affinity column and was eluted intact and active.
- The unbound fraction primarily contained nicked PSA forms.
- ProPSA required trypsin activation to bind the peptide column.
Conclusions:
- PSA-binding peptides can effectively separate enzymatically active PSA from other forms.
- These peptides show potential as ligands for detecting active free PSA.
- This method could improve diagnostic specificity for prostate cancer.