Summary
Induction of procoagulant factors in malignant cells is considered to be the major
cause of coagulation disorders in cancer. Thrombomodulin (TM), a negative regulator
of coagulation was also found to be expressed in cancer cells. We report here evidence
for another anticoagulant, the endothelial cell protein C receptor (EPCR), in cancer
cells. EPCR was detected in several cell lines derived from various types of cancer.
Significant levels of protein C (PC) activation were detected only with cell lines
expressed both EPCR and TM. Anti-EPCR monoclonal antibodies (mAbs) specifically inhibited
the activation. Thus, EPCR function appears to be important for PC activation by cancer
cells. In addition, we detected EPCR expression in tumor cells from breast cancer
patients, with an extremely high frequency. EPCR function may contribute to progression
or pathogenesis of some types of cancer, and may explain the complexity of coagulopathy
in cancer patients.
Keywords
Protein C - endothelial cell - receptor - glioblastoma - leukemia