Dynole 34-2 is a potent dynamin GTPase inhibitor ( IC 50 s=6.9 and 14.2 µM for dynamin1 and dynamin2 GTPase activity, respectively) with antimitotic effect. Dynole 34-2 induces apoptosis , as revealed by cell blebbing, DNA fragmentation, and PARP cleavage. Dynole 34-2 also potently inhibits receptor mediated endocytosis (RME) .