Related Experiment Videos
The effect of lanosterol on platelet aggregation in human platelets
Thrombosis and Haemostasis
|December 17, 1985
Summary
Lanosterol sensitizes human platelets to agonists like adrenaline and ADP. However, it does not alter membrane fluidity, and its concentration is too low to significantly influence platelet behavior.
Area of Science:
- Biochemistry
- Hematology
Background:
- Lanosterol has been shown to sensitize rat platelets to agonists.
- The effect of lanosterol on human platelets and its mechanism remain unclear.
Purpose of the Study:
- To investigate the effect of lanosterol on human platelet sensitivity to agonists.
- To determine if lanosterol alters human platelet membrane fluidity.
Main Methods:
- Human platelets were treated with lanosterol, cholesterol, 4-cholesten-3-one, and ethynyloestradiol.
- Platelet sensitivity to agonists (adrenaline, ADP) was measured.
- Membrane fluidity was assessed using diphenylhexatriene.
- Lanosterol synthesis was studied using [4C]-mevalonic acid.
Main Results:
- Lanosterol increased human platelet sensitivity to adrenaline and ADP at low concentrations.
- Other tested steroids had no effect or were inhibitory.
- Lanosterol did not affect platelet membrane fluidity.
- Lanosterol synthesis was not accelerated by platelet activation.
Conclusions:
- Lanosterol can sensitize human platelets, but not through altered membrane fluidity.
- The observed effects suggest lanosterol might influence platelet behavior via plasma, though concentrations are likely insufficient.
- Further research is needed to fully elucidate lanosterol's role in platelet function.