Biological Activity
daun02 is an inhibitor of cell viability with ic50 values of 1.5μm, 3.5μm and 0.5μm, respectively in panc02, mcf-7 and t47-d cell lines [1].daun02, an anthracycline derivative, is a substrate of β-galactosidase. β-galactosidase catalyses daun02 into daunomycin, which causes apoptotic cell death and blockade of voltagedependent calcium channels. daun02 has been used in the study of suicide gene therapy which has thepotential to increase the selective toxicityof conventional antitumor agents. in this study, daun02 is shown to suppress the viability of several β-gal gene transduced tumor celllinesin vitro. however, none of thetumors responded to treatment withdaun02in vivo. this mayhave been due tothe limited aqueous solubilityof the agent.daun02 is also used to study activated neuronal ensembles in models of conditioned drug effects and relapse. the method is called daun02 inactivation method. in the fos–lacz transgenic rats, the previously drug activated neurons can be inactivated through injection of the prodrug daun02 [1,2].carl r. lupica, yavinshaham and bruce t. hope.new technologies for examining the role of neuronal ensembles in drug addiction and fear.nature reviews/neuroscience. 2013, 14: 743-754.
in vitro
Daun02 is a prodrug, which is converted by β-galactosidase to Daunorubicin, which has been shown to reduce calcium ion (Ca 2+ )-dependent action potentials in neuroblastoma cells. Daunorubicin is a topoisomerase inhibitor.It is a good substrate for β-galactosidase (β-gal). The concentration of Daun02 producing 50% (EC 50 ) decrease in cell viability is 0.5 μM, 1.5 μM, and 3.5 μM for T47-D, Panc02, and MCF-7, respectively.
References
[1] david farquhar, bih fang pan, mamoru sakurai, ajitghosh, craig a. mullen, j. arly nelson. suicide gene therapy using e.coliβ-galactosidase. cancer chemotherpharmacol.2002, 50: 65–70.
[2] fabio c. cruz, eisukekoya, danielle h. guez-barber, jennifer m. bossert,
