A homogeneous and multiplexed immunoassay for high-throughput screening using fluorometric microvolume assay...

Area of Science:

• Biochemistry
• Immunology
• Assay Technology

Background:

• Traditional immunoassays like ELISAs can be time-consuming and reagent-intensive.
• There is a need for high-throughput, sensitive, and cost-effective immunoassay methods.

Purpose of the Study:

• To develop a homogeneous bead-based immunoassay, termed fluorescence-linked immunosorbent assay (FLISA).
• To adapt FLISA for use with fluorometric microvolume assay technology (FMAT) and demonstrate its performance.
• To showcase FLISA's suitability for high-throughput screening of cytokines.

Main Methods:

• Development of a bead-based immunoassay using FMAT.
• Adaptation of existing immunoassays into the FLISA format.
• Utilizing a helium/neon laser scanner for bead-bound fluorescence detection without wash steps.
• Demonstration of one-color and two-color FLISAs for IL-6 and IL-8 cytokine detection.

Main Results:

• FLISA demonstrated comparable linear dynamic range and sensitivity to traditional ELISAs.
• The assay requires 100-fold less primary antibody and eliminates the need for wash steps.
• Accurate measurement of IL-6 and IL-8 concentrations in cell culture media was achieved.
• Successful multiplexed detection of IL-6 and IL-8 in a simulated high-throughput format.

Conclusions:

• FLISA is a versatile, homogeneous immunoassay adaptable to existing platforms.
• The assay's efficiency in reagent use, reduced hands-on time, and multiplexing capability make it ideal for high-throughput screening.
• FLISA offers a sensitive and robust alternative to conventional immunoassays for cytokine analysis.