The constant of affinity (K) of Cyclo (-RGDfK-) for purified integrin is 41.70 nM. Cyclo (-RGDfK) is reacting with HEK293(β3) cells moderately. Cyclo(-RGDfK-) modified micelles shows strong affinity to T-24 cells and strong inhibitory effect on the proliferation of T-24 cells.
In vivo
In athymic mice bearing α(v)β(3)-integrin-positive C6 gliomas, Cyclo (-RGDfK-) modification induces less tumor progression, less tumor metabolic activity, fewer intratumoral vessels.