Comparing the old and new generation SELDI-TOF MS: implications for serum protein profiling

Area of Science:

• Biomarker Discovery
• Mass Spectrometry
• Proteomics

Background:

• The PBS-IIc SELDI-TOF MS is widely used for biomarker discovery but faces limitations in quantification and reproducibility.
• A new generation instrument, the PCS 4000 series, was developed with enhanced features to address these issues.
• This study evaluates the performance of the PBS-IIc and PCS 4000 series SELDI-TOF MS instruments.

Purpose of the Study:

• To compare the analytical performance of the PBS-IIc and PCS 4000 series SELDI-TOF MS instruments.
• To assess improvements in peak detection, biomarker potential, and reproducibility.
• To evaluate performance specifically after serum fractionation for low-abundant protein detection.

Main Methods:

• Two sample sets were analyzed using both PBS-IIc and PCS 4000 series instruments on the same ProteinChip arrays.
• Generated spectra were analyzed using associated software packages.
• Performance was evaluated based on peak detection, biomarker potential, reproducibility, and analysis of serum fractions.

Main Results:

• The PCS 4000 series instrument did not show improved performance in terms of peak detection, biomarker potential, or reproducibility for crude serum analysis compared to the PBS-IIc.
• However, the PCS 4000 series demonstrated superior performance in peak detection when analyzing serum fractions.

Conclusions:

• The PCS 4000 series SELDI-TOF MS instrument offers no advantage over the PBS-IIc for crude serum analysis.
• Its enhanced capability in analyzing serum fractions holds promise for improved detection and identification of low-abundant protein biomarkers.
• Serum fractionation is a valuable technique for reducing dynamic range and facilitating biomarker discovery.