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Sensitive solid phase enzyme immunoassay for human IgA, secretory IgA, and secretory component.
Clinica Chimica Acta; International Journal of Clinical Chemistry
|October 26, 1981
Summary
New immunoassays accurately measure human immunoglobulin A (IgA), secretory component (SC), and secretory IgA (SIgA) in various bodily fluids. These highly sensitive methods enable precise quantification of these crucial immune proteins.
Area of Science:
- Immunology
- Biochemistry
- Analytical Chemistry
Background:
- Immunoglobulin A (IgA) is a critical antibody in mucosal immunity.
- Secretory component (SC) is essential for IgA transport and stability.
- Accurate measurement of IgA, SC, and secretory IgA (SIgA) is vital for understanding immune responses.
Purpose of the Study:
- To develop highly sensitive solid-phase immunoassay systems for human IgA, SC, and SIgA.
- To enable specific and accurate quantification of these proteins in biological samples.
- To correct for cross-reactivity between different IgA forms.
Main Methods:
- Utilized antisera against IgA alpha-chain and SC, with beta-D-galactosidase as a label.
- Employed solid-phase immobilized F(ab')2 antibody fragments and antibody Fab'-beta-D-galactosidase complexes.
- Developed specific assays for IgA, SC, and SIgA, addressing cross-reactivity issues.
Main Results:
- Achieved high sensitivity for IgA (>1 fmol), SC (>0.4 fmol), and SIgA (2.5 fmol).
- Identified significant cross-reactivity of IgA and SC assays with SIgA.
- Successfully corrected IgA and SC measurements by accounting for SIgA presence.
Conclusions:
- Developed sensitive and specific solid-phase immunoassays for IgA, SC, and SIgA.
- The method allows for accurate quantification of these proteins in complex biological matrices.
- This technique facilitates the study of mucosal immunity and related conditions.