1
|
Chen YP, Hou XY, Yang CS, Jiang XX, Yang M, Xu XF, Feng SX, Liu YQ, Jiang G. DNA methylation and histone acetylation regulate the expression of MGMT and chemosensitivity to temozolomide in malignant melanoma cell lines. Tumour Biol 2016; 37:11209-18. [PMID: 26943799 DOI: 10.1007/s13277-016-4994-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Accepted: 12/28/2015] [Indexed: 12/31/2022] Open
Abstract
Malignant melanoma is an aggressive, highly lethal dermatological malignancy. Chemoresistance and rapid metastasis limit the curative effect of multimodal therapies like surgery or chemotherapy. The suicide enzyme O6-methylguanine-DNA methyltransferase (MGMT) removes adducts from the O6-position of guanine to repair DNA damage. High MGMT expression is associated with resistance to therapy in melanoma. However, it is unknown if MGMT is regulated by DNA methylation or histone acetylation in melanoma. We examined the effects of the DNA methylation inhibitor 5-Aza-2'-deoxycytidine and histone deacetylase inhibitor Trichostatin A alone or in combination on MGMT expression and promoter methylation and histone acetylation in A375, MV3, and M14 melanoma cells. This study demonstrates that MGMT expression, CpG island methylation, and histone acetylation vary between melanoma cell lines. Combined treatment with 5-Aza-2'-deoxycytidine and Trichostatin A led to reexpression of MGMT, indicating that DNA methylation and histone deacetylation are associated with silencing of MGMT in melanoma. This study provides information on the role of epigenetic modifications in malignant melanoma that may enable the development of new strategies for treating malignant melanoma.
Collapse
Affiliation(s)
- Ya-Ping Chen
- Department of Dermatology, Affiliated Hospital of Xuzhou Medical College, Xuzhou, 221002, China
- Department of Stereotactic Radiosurgery, Affiliated Hospital of Xuzhou Medical College, Xuzhou, 221002, China
| | - Xiao-Yang Hou
- Department of Dermatology, Affiliated Hospital of Xuzhou Medical College, Xuzhou, 221002, China
| | - Chun-Sheng Yang
- Department of Dermatology, Affiliated Huai'an Hospital of Xuzhou Medical College, Huai'an, 223002, China
| | - Xiao-Xiao Jiang
- Department of Stereotactic Radiosurgery, Affiliated Hospital of Xuzhou Medical College, Xuzhou, 221002, China
| | - Ming Yang
- Department of Stereotactic Radiosurgery, Affiliated Hospital of Xuzhou Medical College, Xuzhou, 221002, China
| | - Xi-Feng Xu
- Department of Stereotactic Radiosurgery, Affiliated Hospital of Xuzhou Medical College, Xuzhou, 221002, China
| | - Shou-Xin Feng
- Department of Dermatology, Affiliated Hospital of Xuzhou Medical College, Xuzhou, 221002, China
| | - Yan-Qun Liu
- Department of Dermatology, Affiliated Hospital of Xuzhou Medical College, Xuzhou, 221002, China
| | - Guan Jiang
- Department of Dermatology, Affiliated Hospital of Xuzhou Medical College, Xuzhou, 221002, China.
| |
Collapse
|