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An amplified ELISA for human tumour necrosis factor alpha
R Markham1, L Young, I S Fraser
1Department of Obstetrics and Gynaecology, Queen Elizabeth II Research Institute for Mothers and Infants, University of Sydney, NSW, Australia.
European Cytokine Network
|January 1, 1995
Summary
A new enzyme-amplified immunoassay significantly enhances detection of tumor necrosis factor alpha (TNF-alpha). This method achieves a 1 pg/ml detection limit, improving upon conventional techniques for analyzing TNF-alpha in biological samples.
Area of Science:
- Biochemistry
- Immunology
- Analytical Chemistry
Background:
- Tumor necrosis factor alpha (TNF-alpha) is a key cytokine involved in inflammatory processes.
- Accurate quantification of TNF-alpha in biological fluids is crucial for understanding various disease states.
- Existing immunoassay methods often lack the sensitivity required for detecting low physiological levels of TNF-alpha.
Purpose of the Study:
- To develop a highly sensitive enzyme-amplified immunoassay for the quantitative determination of TNF-alpha.
- To improve the detection limit of TNF-alpha assays using a novel enzyme cycling system.
- To evaluate the utility of the developed assay for measuring serum TNF-alpha levels in women with gynecological conditions.
Main Methods:
- A sandwich immunoassay format was employed using a mouse monoclonal capture antibody and a polyclonal rabbit anti-TNF-alpha detection antibody.
- A novel enzyme cycling system, AMPAK, was utilized to amplify the colorimetric signal generated by alkaline phosphatase.
- The assay's sensitivity and detection limit were determined using standard protocols.
Main Results:
- The developed immunoassay demonstrated a significantly enhanced sensitivity.
- The assay achieved a detection limit of approximately 1 pg/ml, surpassing conventional methods.
- Application of the assay to serum samples from women with non-malignant gynecological conditions revealed a mean TNF-alpha concentration of 10 pg/ml.
Conclusions:
- The enzyme-amplified immunoassay provides a highly sensitive and effective method for quantifying TNF-alpha.
- The AMPAK system significantly boosts assay sensitivity, enabling detection of low TNF-alpha concentrations in body fluids.
- This advanced assay is valuable for clinical research and diagnostics, particularly in conditions associated with altered TNF-alpha levels.