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Specific interaction between placental protein 5 and heparin
Clinica Chimica Acta; International Journal of Clinical Chemistry
|February 19, 1981
Summary
Heparin in plasma samples significantly lowers apparent placental protein 5 (PP5) levels during pregnancy. This interaction, reversed by protamine sulfate, highlights PP5
Area of Science:
- Biochemistry
- Immunology
- Reproductive Biology
Background:
- Accurate measurement of placental proteins is crucial for monitoring pregnancy.
- Placental protein 5 (PP5) is a key marker in prenatal diagnostics.
- Variations in sample matrices can affect protein quantification.
Purpose of the Study:
- To investigate the influence of heparin on the measured levels of placental protein 5 (PP5).
- To determine the dose-dependency and specificity of heparin's effect on PP5.
- To explore the implications for PP5 measurement in clinical settings.
Main Methods:
- Radioimmunoassay (RIA) was used to quantify PP5 in paired serum and plasma samples.
- Heparin was added to serum and plasma to assess its effect on PP5 levels.
- Affinity chromatography was employed to confirm the interaction specificity between heparin and PP5.
Main Results:
- Apparent PP5 levels were significantly higher in serum compared to heparin-derived plasma.
- Heparin addition caused a dose-dependent decrease in PP5 concentration in serum.
- The heparin-PP5 interaction was reversible with protamine sulfate and specific.
Conclusions:
- Heparin interferes with PP5 measurement, leading to underestimated concentrations in plasma.
- The findings necessitate careful consideration of anticoagulant choice for PP5 assays.
- Understanding heparin-PP5 interaction is vital for accurate interpretation of pregnancy protein markers.