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Thrombomodulin, an endothelial anticoagulant protein, is absent from the
human brain
H Ishii, HH Salem, CE Bell, EA Laposata and PW Majerus
Protein C activation by thrombin is significantly accelerated by the
endothelial cell cofactor, thrombomodulin. In this study, we have developed
a radioimmunoassay for thrombomodulin and have measured the cofactor
content in several human tissues. The assay method detects as little as 2
ng of thrombomodulin. The highest thrombomodulin content was found in lung
and placenta, but the antigen was also detected in spleen, pancreas, liver,
kidney, skin, heart, and aorta. Unexpectedly, thrombomodulin was absent
from brain. Extracts from cerebral cortex, cerebellum, centrum semiovale,
midbrain, basal ganglia, pons, and medulla were devoid of thrombomodulin.
In contrast, thrombomodulin antigen is present in extracerebral
intracranial vessels, including basilar and internal carotid arteries and
choroid plexus, as well as in endothelium of the pia-arachnoid.
Volume 67,
Issue 2,
pp. 362-365,
02/01/1986
Copyright © 1986 by The American Society of Hematology

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