RESUMO
OBJECTIVE: To investigate the inhibitory effects of novel phosphodiesterase 4 inhibitor ZL-n-91 to the proliferation of leukemia cells L1210 and K562. METHODS: CCK-8 method was used to detect the effect of ZL-n-91 to the proliferation of L1210 and K562 cells, and the proliferation rate, IC50 were calculated. The effects of ZL-n-91 to the cycle of L1210 and K562 cells was detected by PE single staining, and the effects of ZL-n-91 to the apoptosis of L1210 and K562 cells was detected by PE/7AA-D double staining. Western blot was used to detect the effect of ZL-n-91 to the expression levels of apoptosis related proteins. Subcutaneous tumor transplantation model of acute lymphoblastic leukemia L1210 was established in the nude mice, and the inhibitory effect of oral administration of ZL-n-91 to the xenograft was observed. RESULTS: ZL-n-91 showed a significant inhibitory effect to the proliferation of leukemia cells L1210 and K562 in a dose-dependent manner (P<0.001). After treated by ZL-n-91, the leukemia cells L1210 and K562 in the S-phase in cell cycle decreased significantly compared with those in control group (P<0.01). The apoptosis of leukemia cells L1210 and K562 could be induced by ZL-n-91 (P<0.001), and the expression level of apoptosis related protein BAX significantly increased. In the animal experiment, the result showed that ZL-n-91 could significantly inhibit the growth of subcutaneously transplantation tumor (P<0.05). CONCLUSION: The novel phosphodiesterase 4 inhibitor ZL-n-91 can effectively inhibit the proliferation of leukemia cells L1210 and K562, which has the potential of anti-leukemia drug development.