Abstract
Objective To study apoptotic effect and mechanisms of sonodynamic therapy (SDT) with hematoporphyrin monomethyl ether (HMME) on C6 glioma cells in vitro. Methods Time of ultrasound irradiation was optimized by methyl thiazol tetrazolium (MTT) . Apoptotic rate( AR) generation of reactive oxygen species (ROS) ,mitochondrial membrane potential (MMP) were detected by flow cytometry ,and expressions of apoptosis proteins were measured by Western blotting after SDT treatment. Results 60 s is the optimal time irradiation by MTT when the ultrasound frequency was maintained in 1 mHz and the average intensity was kept in 1. 0 W/cm2. To compare with the control,HMME and ultrasound group,treatment of C6 glioma cells with SDT resulted in the occurrence of apoptosis(34. 7 ±1.9)% .which was associated with the production of ROS ( 36. 4 ± 3. 1) % and loss of MMP (44. 9 ± 3. 4) %. The results showed that significantly increased expression in bax,Caspase-9 ,-3 , decreased in bcl-2 after SDT treatment. The results also showed apparent release of cytochome c in the SDT group versus to the other three groups. Conclusion Our results suggested that SDT mediated by HMME could induce apoptosis in C6 glioma cells.The mitochondrial signal pathway may play a pivotal role in the apoptosis. Key words: Glioma; Sonodynamic therapy; Hematoporphyrin monomethy lether; Apoptosis
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