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The peroxidase activity and cellular content of granule proteins in PMN during pregnancy
Abstract:
The cellular content of myeloperoxidase (MPO), chymotrypsin-like cationic protein (CCP) and lactoferrin (LF) of isolated polymorphonuclear leucocytes (PMNs) from pregnant women were analysed by immuno-chemical methods. The cellular levels of MPO and CCP were unaltered during pregnancy while the cellular levels of LF were increased during pregnancy and post partum (P less than 0.01). Peroxidase activity within isolated PMN was analysed by two methods, a Guaiacol method and a Chemiluminescence method. The activity was found to be reduced during pregnancy. The reduction was explained by the reduction in eosinophil peroxidase which in turn was a consequence of a reduced number of circulating eosinophils during pregnancy.
Insights
Pregnancy alters immune cell composition. While myeloperoxidase and chymotrypsin-like cationic protein levels in polymorphonuclear leucocytes remain stable, lactoferrin increases. Peroxidase activity decreases due to fewer circulating eosinophils.
Area of Science:
- Immunology
- Hematology
- Reproductive Biology
Background:
- Polymorphonuclear leucocytes (PMNs) play a crucial role in innate immunity.
- Changes in PMN cellular content and function during pregnancy are not fully understood.
- Key proteins like myeloperoxidase (MPO), chymotrypsin-like cationic protein (CCP), and lactoferrin (LF) are important PMN components.
Purpose of the Study:
- To investigate the cellular levels of MPO, CCP, and LF in PMNs from pregnant women.
- To analyze the peroxidase activity within PMNs during pregnancy.
- To understand the impact of pregnancy on specific PMN components and functions.
Main Methods:
- Immuno-chemical methods were used to quantify cellular MPO, CCP, and LF in isolated PMNs.
- Peroxidase activity was measured using Guaiacol and Chemiluminescence assays.
- Cellular counts of PMNs and eosinophils were assessed.
Main Results:
- Cellular levels of MPO and CCP in PMNs were unchanged during pregnancy.
- Cellular levels of LF in PMNs significantly increased during pregnancy and postpartum (P < 0.01).
- Overall PMN peroxidase activity was reduced during pregnancy, attributed to decreased eosinophil peroxidase from fewer circulating eosinophils.
Conclusions:
- Pregnancy selectively alters the cellular content of PMNs, with increased lactoferrin.
- Reduced PMN peroxidase activity during pregnancy is linked to a decrease in circulating eosinophils.
- These findings highlight pregnancy-induced adaptations in innate immune cell composition and function.