A sensitive enzyme-linked immunosorbent assay for human interleukin-8.

Area of Science:

• Immunology
• Biochemistry
• Assay Development

Background:

• Human interleukin-8 (IL-8) is a key chemokine involved in immune cell chemotaxis.
• Accurate quantification of IL-8 is crucial for understanding inflammatory and immune responses.

Purpose of the Study:

• To develop and validate a sensitive and specific enzyme-linked immunosorbent assay (ELISA) for quantifying human IL-8.
• To assess the assay's performance characteristics, including sensitivity, specificity, and reproducibility.

Main Methods:

• Development of an ELISA using monoclonal antibodies (mAbs) against IL-8.
• Testing of three specific mAbs (BS-1, WS-4, WS-6) for their efficacy in the assay.
• Validation of the assay's sensitivity, specificity against related cytokines, and intra-/inter-assay variability.
• Detection of natural IL-8 from cultured human cells stimulated with IL-1.

Main Results:

• The developed ELISA demonstrated high sensitivity, with a detection limit of 16 pg/ml using the WS-4 mAb.
• The assay exhibited high specificity for IL-8, showing no cross-reactivity with structurally related cytokines like MCAF.
• Intra- and inter-assay coefficients of variation were below 10%, indicating good reproducibility.
• The ELISA successfully detected natural IL-8 (72 and 77 amino acid forms) in stimulated human cell cultures.

Conclusions:

• A novel, sensitive, and specific ELISA for human IL-8 quantification has been successfully developed.
• This assay is suitable for detecting natural IL-8 in various biological fluids.
• The assay provides a valuable tool for research in immunology and inflammatory diseases.