To assess the potential roles of protein Z (PZ) and protein Z-dependent protease inhibitor
(ZPI) in venous thrombosis, their plasma levels were measured in 426 individuals with
venous thrombosis and 471 control individuals participating in the Leiden Thrombophilia
Study. A relationship between the level of PZ or ZPI and venous thrombosis was not
detected in the overall case-control study. PZ and ZPI circulate as a complex and
their plasma levels are interdependent. Both PZ and ZPI are increased with oral contraceptive
use and reduced with oral anticoagulant therapy.
Keywords
Coagulation inhibitors - clinical / epidemiological studies - thrombophilia