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Reduction in erythrocyte complement receptor 1 (CR1, CD35) and decay accelerating factor (DAF, CD55) during normal
H J Imrie1, T P McGonigle, D T Liu
1Department of Immunology, University Hospital Queen's Medical Centre, Nottingham, UK.
Journal of Reproductive Immunology
|October 1, 1996
Summary
Red blood cell (RBC) complement receptor 1 (CR1) and decay accelerating factor (DAF) decrease during pregnancy, returning to normal postpartum. This suggests increased immune complex activation in pregnant individuals.
Area of Science:
- Immunology
- Obstetrics
- Hematology
Background:
- Pregnancy involves significant immunological adaptations.
- Complement system plays a crucial role in immune regulation.
- Red blood cell surface proteins modulate complement activity.
Purpose of the Study:
- To investigate changes in RBC complement regulatory proteins during pregnancy.
- To assess the expression of CR1, DAF, and CD59 throughout gestation and postpartum.
- To explore the implications of these changes on immune complex levels and complement activation.
Main Methods:
- Assay of RBC-membrane CR1 expression in pregnant and postpartum individuals.
- Measurement of RBC decay accelerating factor (DAF) and CD59 expression.
- Comparison of protein levels at different stages of pregnancy and postpartum.
Main Results:
- RBC CR1 levels significantly decrease as pregnancy progresses, reaching lowest levels in the third trimester.
- RBC CR1 expression returns to near-normal levels within 48 hours postpartum.
- Reduced expression of RBC DAF observed during pregnancy; no significant change in RBC CD59 expression.
Conclusions:
- The observed reduction in RBC CR1 and DAF during pregnancy may indicate elevated circulating immune complexes.
- Increased complement activation is suggested as a consequence of higher immune complex levels in pregnancy.
- These findings highlight dynamic changes in RBC complement regulation during gestation.