A new highly sensitive immunoassay for cytokines by dissociation-enhanced lanthanide fluoroimmunoassay (DELFIA)

Area of Science:

• Biochemistry
• Immunology
• Analytical Chemistry

Background:

• Accurate quantification of cytokines like human tumor necrosis factor alpha (TNF alpha) and human interleukin-6 (IL-6) is crucial for understanding inflammatory diseases.
• Existing methods such as enzyme-linked immunosorbent assays (ELISAs) and bioassays have limitations in sensitivity and measurement range for these biomarkers.

Purpose of the Study:

• To establish novel non-isotopic immunoassays for human TNF alpha and IL-6.
• To enhance the sensitivity and measurement range compared to conventional immunoassay techniques.

Main Methods:

• Development of dissociation-enhanced lanthanide fluoroimmunoassay (DELFIA) systems for TNF alpha and IL-6.
• Utilized time-resolved fluoroimmunoassay technique with europium-labeled antibodies.
• Validated assay performance against established enzyme-linked immunosorbent assays and bioassays.

Main Results:

• The TNF alpha-DELFIA assay achieved a measurable range from 100 fg/ml to 10 ng/ml.
• The IL-6-DELFIA assay demonstrated a measurable range from 100 fg/ml to 1 ng/ml.
• DELFIA systems showed significantly increased sensitivity and measurement range compared to ELISAs and bioassays.

Conclusions:

• The developed DELFIA assays provide a highly sensitive and robust method for quantifying human TNF alpha and IL-6.
• These improved assays facilitate more accurate assessment of inflammatory states and disease progression.
• DELFIA technology represents a significant advancement in cytokine detection for research and clinical applications.