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Subclass-specific serological reactivity and IgG4-specific antigen recognition in human echinococcosis
C M Dreweck1, C G Lüder, P T Soboslay
1Section of Infectious Diseases and Clinical Immunology, University Hospitals and Medical Clinic of Ulm, Germany.
Tropical Medicine & International Health : TM & IH
|August 1, 1997
Summary
Elevated immunoglobulin E (IgE) and immunoglobulin G4 (IgG4) antibody levels indicate active echinococcosis (Echinococcus multilocularis and Echinococcus granulosus) infection. These serological markers can predict disease progression and aid in post-treatment follow-up.
Area of Science:
- Immunology
- Parasitology
- Medical Diagnostics
Background:
- Echinococcosis, caused by Echinococcus species, presents diagnostic challenges.
- Immunoglobulin (Ig) subclass responses are crucial for understanding host-parasite interactions in helminthic infections.
- Distinguishing between active and resolved infections is vital for effective patient management.
Purpose of the Study:
- To evaluate immunoglobulin subclass-specific antibody responses in alveolar echinococcosis (AE) and cystic echinococcosis (CE).
- To correlate specific Ig responses with disease activity and progression in AE and CE patients.
- To assess the utility of serological markers for post-treatment monitoring of echinococcosis.
Main Methods:
- Analysis of immunoglobulin (Ig) subclass-specific antibody responses, including IgE, IgG, IgG1, IgG2, and IgG4.
- Utilized enzyme-linked immunosorbent assay (ELISA) and immunoblotting techniques.
- Categorized AE and CE patients based on clinical criteria, infection status, and treatment.
Main Results:
- Elevated total IgE levels were observed in progressive AE and some CE cases, correlating with active disease.
- AE patients with active disease showed high levels of EmAg-specific IgE, total IgG, IgG1, IgG2, and IgG4.
- Parasite-specific antigen recognition in both AE and CE was predominantly mediated by IgG1 and IgG4, with IgG4 recognizing specific low molecular weight antigens in AE.
Conclusions:
- Elevated IgE and IgG4 responses are indicative of active echinococcosis and potentially severe outcomes.
- Immunoglobulin isotype analysis, particularly IgE and IgG4, can serve as a valuable serological marker for disease activity.
- ELISA combined with immunoblotting offers a useful approach for post-treatment follow-up to detect recrudescent disease in AE patients.