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Plasma abnormal prothrombin and microsomal prothrombin precursor in various species (38492)
Summary
Vitamin K antagonists like coumarin anticoagulants produce abnormal prothrombin in plasma and increase precursor levels in the liver across eight species. This study investigates these vitamin K-dependent protein changes.
Area of Science:
- Biochemistry
- Pharmacology
- Comparative Physiology
Background:
- Abnormal, biologically inactive prothrombin forms are observed in plasma following coumarin anticoagulant administration in cows and humans.
- A similar protein increases in rat liver, postulated as the precursor to plasma prothrombin.
Purpose of the Study:
- To survey eight species for plasma abnormal prothrombin and liver precursor activity after vitamin K antagonist treatment.
- To elucidate the relationship between these observed protein changes and the mechanism of vitamin K action.
Main Methods:
- Administration of coumarin anticoagulants (vitamin K antagonists) to eight different animal species.
- Quantification of abnormal prothrombin in plasma.
- Measurement of liver precursor activity in microsomal preparations.
Main Results:
- Large amounts of plasma abnormal prothrombin were detected in bovine, substantial in chick, and small amounts in rat and mouse plasma.
- Elevated liver precursor activity was observed in all anticoagulant-treated animals, except for the bovine.
- Species-specific differences in abnormal prothrombin and precursor levels were noted.
Conclusions:
- The study confirms the presence of abnormal prothrombin and elevated liver precursor activity in various species treated with vitamin K antagonists.
- Findings suggest a conserved mechanism of vitamin K-dependent protein synthesis and metabolism across diverse species.
- The observed variations provide insights into the species-specific responses to anticoagulant therapy and vitamin K action.