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Effect of phospholipases on factor-VIII activity.
Human Genetics
|January 19, 1978
Summary
Phospholipase D activates Factor VIII, while Phospholipase C inactivates it. This suggests enzyme effects may influence Factor VIII
Area of Science:
- Biochemistry
- Molecular Biology
- Genetics
Background:
- Factor VIII is crucial for blood coagulation.
- Enzymatic modification of Factor VIII can impact its function.
- Understanding these interactions is key to deciphering coagulation disorders.
Purpose of the Study:
- To investigate the effects of phospholipases C and D on Factor VIII.
- To explore the potential enzymatic basis of coagulation disorders like hemophilia A and von Willebrand's disease.
Main Methods:
- Investigated the impact of purified phospholipase C and D on intact and dissociated Factor VIII.
- Assessed enzyme activity at varying concentrations (0.6 U/ml).
- Examined effects on haemophilic cryoprecipitate and partially purified haemophilic Factor VIII.
Main Results:
- Phospholipase D activated intact Factor VIII, but not dissociated components.
- Phospholipase C inactivated both intact and dissociated Factor VIII.
- Phospholipase D did not affect haemophilic cryoprecipitate or Factor VIII.
Conclusions:
- Enzymatic activity, specifically by phospholipase D, can modulate Factor VIII function.
- Hypothesizes hemophilia A may stem from an X-linked enzyme defect affecting phospholipid assembly of Factor VIII.
- Suggests von Willebrand's disease could result from a structural defect in the Factor VIII protein.