Highly multiplexed antibody suspension bead arrays for plasma protein profiling

Area of Science:

• Biochemistry
• Proteomics
• Analytical Chemistry

Background:

• Antibody microarrays are valuable for protein screening in complex biological samples.
• Directly labeled sample application offers a high-throughput alternative to traditional sandwich assays.
• Suspension bead arrays provide a microtiter plate-based format for flexible screening.

Purpose of the Study:

• To develop and validate a bead-based antibody array system for protein profiling.
• To enable high-throughput analysis of protein expression in body fluids.
• To establish a robust assay for detecting low-abundance proteins.

Main Methods:

• Development of a suspension antibody array using color-coded beads.
• Established a procedure for analyzing biotinylated samples without excess label removal.
• Utilized a microtiter plate format for parallel sample processing.

Main Results:

• The assay system achieves detection limits in the lower pico-molar and higher pg/ml range.
• Demonstrated dynamic ranges spanning over three orders of magnitude.
• The workflow supports profiling of 384 samples for up to 384 proteins per assay.

Conclusions:

• The bead-based antibody array is a powerful tool for systematic, high-throughput protein profiling.
• This method facilitates flexible exploration of protein profiles in large sample cohorts.
• The assay offers sensitive and quantitative analysis of protein expression in biological fluids.