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[Validity limits of data on secretory IgA]
F Rosaschino1, M Vercelloni, R Torre
1Istituto di Pediatria, Università di Milano.
Bollettino Dell'Istituto Sieroterapico Milanese
|January 1, 1990
Summary
Salivary Secretory Immunoglobulin A (sIgA) levels show high variability, questioning their use for evaluating respiratory infections or treatment responses. Emotional factors may influence sIgA production and secretion.
Area of Science:
- Immunology
- Respiratory Medicine
- Genetics
Background:
- Secretory Immunoglobulin A (sIgA) is a key component of mucosal immunity.
- Titration of sIgA in saliva has been explored in various clinical contexts.
Purpose of the Study:
- To investigate sIgA levels in respiratory tract infections and after Erythromycin treatment.
- To assess sIgA levels post-surgery and explore potential hereditary predispositions to high sIgA.
- To understand the variability of sIgA levels in saliva.
Main Methods:
- Radial immunodiffusion technique used for sIgA titration in saliva and expectoration.
- Studies conducted on pediatric and adult groups, including those with acute/chronic respiratory infections, post-treatment, and post-surgery.
- Longitudinal sIgA monitoring in a healthy individual.
Main Results:
- High variability in sIgA levels was observed across different groups and situations.
- This variability cast doubt on the utility of salivary sIgA for the intended evaluations.
- Consistent high variability was confirmed even in a healthy individual over ten days.
Conclusions:
- The significant variability of salivary sIgA levels limits their application in assessing respiratory infections, treatment efficacy, or surgical outcomes.
- Psychological and emotional factors are hypothesized to influence IgA and sIgA production, mobilization, and secretion, contributing to observed variability.