Before the anti-cytotoxicity effect of Rb2 was tested, the toxicity of
Rb2 onMC3T3-E1was observed. The results showed that Rb2 treatment
alone did not affect cell survival at the consistencies tested in this experiment
(Fig. 2A). Subsequently, we tested the survival of MC3T3-E1 cells
to observe the defensive effects by Rb2 on the repercussion of the cells
after H2O2-induced oxidative damage. We implemented oxidative
damage on MC3T3-E1 cells using 0.3mMH2O2 for 24 h.When different
concentrations of Rb2 (0.1, 1, 10 μM) were administered to MC3T3-E1
cells for 24 h before H2O2 treatment, the viability of the cells increased
compared to the group without Rb2 treatment, which indicates that
Rb2, in part, inhibited H2O2-induced cytotoxicity (Fig. 2B). N-acetyl-Lcysteine
represented the positive control, which significantly
suppressed cytotoxicity induced by H2O2 at 1 mM.