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Complement activation during painful crisis in sickle cell anemia
C Mold1, J D Tamerius, G Phillips
1Department of Microbiology, University of New Mexico, Albuquerque 87131, USA.
Clinical Immunology and Immunopathology
|September 1, 1995
Summary
Complement activation is linked to sickle cell disease (SCD) activity. During painful crises in SCD, complement system activation increases, indicating a role in disease flares and inflammation.
Area of Science:
- Hematology
- Immunology
- Molecular Biology
Background:
- Sickle cell disease (SCD) is associated with complement activation, potentially increasing infection risk.
- Previous work identified alternative pathway activation in sickled erythrocytes due to membrane phospholipid changes.
Purpose of the Study:
- To compare complement activation products in sickle cell anemia patients.
- To examine the correlation between complement activation and disease activity during painful crises and at baseline.
Main Methods:
- Serial plasma samples from SCD patients were analyzed.
- Plasma concentrations of complement activation products (Bb, C4d, C3a) were measured.
- Erythrocyte-bound C3 was quantified.
Main Results:
- Patients with intermittent pain showed increased Bb and C3a during painful crises.
- Patients with continuous pain exhibited elevated C3a and C4d levels irrespective of hospitalization.
- These findings suggest a continuous inflammatory process in patients with continuous pain.
Conclusions:
- Complement activation correlates with disease activity in sickle cell anemia.
- The alternative complement pathway is implicated in the pathophysiology of SCD pain crises.
- Distinct complement activation patterns may differentiate SCD patient subgroups.