The target for the antitumoral peptidic drug, Kahalalide F, has been s
tudied in cultured cells. In the presence of the compound, the cells b
ecame impressively swollen, showing the formation of large vacuoles. T
he formation of these vacuoles appears to be the consequence of change
s in lysosomal membranes. Thus, lysosomes are a target for Kahalalide
F action.