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Complement and dengue haemorrhagic fever/shock syndrome
1Department of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand.
Insights
The complement system, crucial for immunity, is activated during Dengue Hemorrhagic Fever/Dengue Shock Syndrome (DHF/DSS), contributing to shock and leakage. Its activation correlates with disease severity, suggesting a key role in DHF/DSS pathogenesis.
Area of Science:
- Immunology
- Pathophysiology
- Virology
Background:
- Dengue Hemorrhagic Fever/Dengue Shock Syndrome (DHF/DSS) is a severe manifestation of dengue virus infection.
- The complement system plays a vital role in immune responses but can also contribute to inflammatory diseases.
Purpose of the Study:
- To investigate the role of complement system activation in the pathogenesis of DHF/DSS.
- To determine the correlation between complement activation products and disease severity.
Main Methods:
- Assay of complement activation products (C3a, C5a) in patient serum.
- Assessment of disease severity and presence of shock and leakage.
- Detection of circulating immune complexes using standard techniques.
Main Results:
- Complement activation was observed in DHF/DSS patients.
- Peak complement activation and presence of C3a and C5a correlated with shock and leakage onset.
- C3a levels showed a strong correlation with DHF/DSS disease severity.
Conclusions:
- The complement system plays a significant role in the pathogenesis of shock in DHF/DSS.
- Circulating immune complexes were not consistently detected, suggesting other mechanisms may drive complement activation.
- Further investigation into alternative complement activation pathways in DHF/DSS is warranted.
Abstract:
The complement system is activated in DHF/DSS. The peak of activation and the presence of C3a and C5a anaphylatoxins coincided with the onset of shock and leakage. The levels of C3a correlated well with disease severity. This indicated an important role of the complement system in the pathogenesis of shock. Circulating immune complexes as assayed by two standard techniques were not detected in the majority of patients, and if detected were found in small amount. The role of circulating immune complexes in the activation of complement in DHF/DSS needs to be reinvestigated, and other possible mechanisms leading to complement activation should be sought.