Thiophilic interaction chromatography of prostate-specific antigen
K C Chadha1, E Kawinski, E Sulkowski
1Roswell Park Cancer Institute, Department of Molecular and Cellular Biology, Buffalo, NY 14263, USA. kailash.chadha@roswellpark.org
Summary
Thiophilic gels (T-gels) effectively isolate prostate-specific antigen (PSA) and its complexes. This T-gel affinity method shows high PSA recovery, suggesting its use for purifying PSA from biological fluids.
Area of Science:
- Biochemistry
- Protein Chemistry
- Analytical Chemistry
Background:
- Prostate-specific antigen (PSA) is a crucial biomarker.
- PSA exists as free protein or complexed with inhibitors like alpha1-antichymotrypsin (PSA-ACT) and alpha2-macroglobulin (PSA-A2M).
- Efficient isolation of PSA and its complexes is vital for diagnostic and research applications.
Purpose of the Study:
- To investigate the affinity of thiophilic gels (T-gels) for isolating free PSA and PSA complexes.
- To evaluate the recovery rates of PSA using T-gel affinity chromatography.
- To explore the potential of T-gel affinity for purifying PSA from biological samples.
Main Methods:
- Preparation of free PSA, PSA-ACT, and PSA-A2M complexes in vitro.
- Utilizing thiophilic gels (T-gels) for affinity-based isolation.
- Quantification of PSA recovery using Enzyme-Linked Immunosorbent Assay (ELISA).
Main Results:
- Free PSA and its complexes (PSA-ACT, PSA-A2M) demonstrated strong affinity for T-gels.
- T-gels successfully isolated both free PSA and its protein complexes.
- Average PSA recovery from T-gels ranged from 84% to 94% based on ELISA measurements.
Conclusions:
- T-gel affinity chromatography is a viable method for isolating free and complexed PSA.
- The high recovery rates support the utility of T-gels for PSA purification.
- This technique holds promise for purifying PSA from diverse biological fluids.
