Background/Aim: Histone deacetylase 6 (HDAC6) is considered as one of the most promising targets in drug development for cancer therapy. Drug resistance is a major cause of treatment failure in many cancers including glioblastoma (GBM), the most lethal malignant tumor. The role of HDAC6 in GBM resistance and its underlying mechanisms have not been well elucidated. Herein, we investigated the function of HDAC6 in modulating GBM resistance. Materials and Methods: The anticancer effects of four structurally distinct selective HDAC6 inhibitors were addressed using western blot, flow cytometry, CCK-8 assay, and CI in temozolomide (TMZ)-resistant GBM cells. Results: We showed that HDAC6-selecitve inhibitors block activation of the EGFR and p53 pathways in TMZ-resistant GBM cells. Importantly, the inhibition of HDAC6 correlates with increased levels of MSH2 and MSH6, key DNA mismatch repair proteins, in TMZ-resistant GBM cells. In addition to the MSH, HDAC6 inhibitors decrease MGMT expression in TMZ-resistant GBM cells. Furthermore, HDAC6 inhibitors increase TMZ sensitivity and efficiently induce apoptosis in TMZ-resistant GBM cells. Conclusion: Selective inhibition of HDAC6 may be a promising strategy for the treatment of TMZ-resistant GBM.
Bibliographical noteFunding Information:
The Authors would like to thank Dr. Gyoonhee Han (Yonsei University, Seoul, Korea) for providing A452. This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2016R1D1A1A 02937071, 2018R1A6A1A03023718, 2019R1I1A1A01058601, and 2019R1A2C1008619).
© 2019 International Institute of Anticancer Research. All rights reserved.
All Science Journal Classification (ASJC) codes
- Cancer Research