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ADP induced surface charge changes of adult and newborn platelets
Insights
Newborn and adult platelets have similar surface charges. However, adult plasma affects platelet mobility differently than newborn plasma, possibly due to a specific plasma component.
Area of Science:
- Hematology
- Biochemistry
- Neonatal Research
Background:
- Platelets play a crucial role in hemostasis and thrombosis.
- Understanding platelet surface properties is vital for diagnosing and treating bleeding disorders.
- Differences in neonatal and adult platelet function are not fully understood.
Purpose of the Study:
- To compare the electrophoretic mobility and surface charge density of neonatal and adult platelets.
- To investigate the influence of plasma environment on platelet mobility.
- To identify potential factors in plasma contributing to observed differences.
Main Methods:
- Electrophoretic mobility measurements of washed platelets from adults and newborns.
- Analysis of platelet-plasma interactions using cross-over experiments.
- pH-mobility relationship studies.
- Preliminary investigation of plasma components.
Main Results:
- No significant difference in electrophoretic mobility or pH-mobility relationship between adult and neonatal platelets.
- Identical surface charge density observed on both platelet types.
- Significant differences in ADP-induced mobility changes between adult and neonatal platelets.
- Neonatal platelet behavior differences attributed to plasma, not platelets themselves.
Conclusions:
- Neonatal and adult platelets possess similar intrinsic surface characteristics.
- Adult plasma contains a factor, possibly a 10,000 MW component, that alters platelet mobility differently than neonatal plasma.
- Further research is needed to elucidate the specific plasma component and its mechanism of action.
Abstract:
In experiments reported here electrophoretic mobility of washed platelets and platelets suspended in diluted plasma obtained from adults and newborns was practically the same. No significant difference was observed in the pH-mobility relationship of the two types of platelets. These comparative studies indicate that the actual charge density, i.e. the number and sign of the charged groups at the newborn and adult platelet surfaces are essentially identical. However, a significant difference was found between the two platelet populations in the mobility changes induced by ADP. On the basis of cross over experiments between the platelets and plasma of adults and newborns it seems likely that the different behaviour of neonatal platelets arises from a difference between adult and newborn plasma. Preliminary results indicate that this may be due to the presence in adult plasma of a component with molecular weight about 10 000.