Ifenprodil (NMDA receptor antagonist) was tested as an inhibitor of or
nithine decarboxylase. It was found that ifenprodil inhibited ornithin
e decarboxylase activity with the same potency as alpha-difluoromethyl
ornithine, a major inhibitor of ornithine decarboxylase. This result s
uggests that ifenprodil could target either the polyamine site on the
NMDA receptor complex or/and polyamine biosynthesis. (C) 1998 Elsevier
Science B.V.