The mechanism of antiinflammatory action of cordiachromene A, isolated
from the chloromethylenic extract of the ascidian Aplidium antillense
or chemically synthesized, was studied using different in vivo and in
vitro inhibition tests on enzymes of the cyclooxygenase cascade. Cord
iachromene A inhibits prostacyclin synthesis and arachidonic acid meta
bolism but not phospholipase A(2) and peroxidase. The mechanism of act
ion, already known to be stereospecific, operates by cyclooxygenase in
hibition.