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Enzyme-linked immunosorbent assay for chromogranin A
L Dillen1, J De Block, L Van Lear
1Department of Medicine, University of Antwerp, Wilrijk, Belgium.
Clinical Chemistry
|September 1, 1989
Summary
This study developed an enzyme-linked immunosorbent assay (ELISA) for chromogranin A (CGA) in human plasma. The assay is reliable, but detects two immunoreactive substances, one being native CGA.
Area of Science:
- Biochemistry
- Immunology
- Assay Development
Background:
- Chromogranin A (CGA) is a biomarker found in neuroendocrine cells.
- Accurate measurement of CGA in human plasma is crucial for diagnostics.
- Existing assays may have limitations in specificity or sensitivity.
Purpose of the Study:
- To develop and optimize an enzyme-linked immunosorbent assay (ELISA) for quantifying chromogranin A (CGA).
- To validate the assay's performance for human plasma samples.
- To investigate the immunoreactive forms of CGA in human plasma.
Main Methods:
- Isolation and purification of bovine chromogranin A (CGA).
- Development and optimization of a monoclonal antibody-based ELISA.
- Analysis of human plasma samples using the developed ELISA.
Main Results:
- The developed ELISA demonstrated reliable quantification of bovine CGA from 500 pg to 500 ng.
- Human plasma dilutions paralleled the bovine CGA standard curve, with a 4.56% intra-assay coefficient of variation.
- Two CGA-immunoreactive substances were detected in human plasma, one identified as native CGA, while the other remains uncharacterized.
Conclusions:
- The developed ELISA is a reliable method for measuring CGA in human plasma.
- The presence of an unknown CGA-immunoreactive substance in human plasma warrants further investigation.
- Measured plasma CGA concentrations are consistent with previously reported values.