title: ACY-1215 accelerates vemurafenib induced cell death of BRAF-mutant melanoma cells via induction of ER stress and inhibition of ERK activation.
abstract: BRAFV600E mutation is found in ~50% of melanoma patients and BRAFV600E kinase activity inhibitor, vemurafenib, has achieved a remarkable clinical response rate. However, most patients treated with vemurafenib eventually develop resistance. Overcoming primary and secondary resistance to selective BRAF inhibitors remains one of the most critically compelling challenges for these patients. HDAC6 has been shown to confer resistance to chemotherapy in several types of cancer. Few studies focused on the role of HDAC6 in vemurafenib resistance. Here we showed that overexpression of HDAC6 confers resistance to vemurafenib in BRAF-mutant A375 cells. ACY-1215, a selective HDAC6 inhibitor, inhibits the proliferation and induces the apoptosis of A375 cells. Moreover, ACY-1215 sensitizes A375 cells to vemurafenib induced cell proliferation inhibition and apoptosis induction, which occur partly through induction of endoplasmic reticulum (ER) stress and inactivation of extracellular signal-regulated kinase (ERK). Taken together, our results suggest that the inhibition of HDAC6 may be a promising strategy for the treatment of melanoma and overcoming resistance to vemurafenib.
authors.affiliation: Department of Dermatology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China.
authors.forename: Ueihuei
authors.initials: U
authors.lastname: Peng
authors.affiliation: School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei 430071, P.R. China.
authors.forename: Zhihao
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Dermatology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China.
authors.forename: Sa
authors.initials: S
authors.lastname: Pei
authors.affiliation: Department of Dermatology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China.
authors.forename: Yunchao
authors.initials: Y
authors.lastname: Ou
authors.affiliation: School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei 430071, P.R. China.
authors.forename: Pengchao
authors.initials: P
authors.lastname: Hu
authors.affiliation: School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei 430071, P.R. China.
authors.forename: Wanhong
authors.initials: W
authors.lastname: Liu
authors.affiliation: Department of Dermatology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China.
authors.forename: Jiquan
authors.initials: J
authors.lastname: Song
mesh_terms: D000971:Antineoplastic Combined Chemotherapy Protocols / Q000494:pharmacology*; D045744:Cell Line, Tumor; D019008:Drug Resistance, Neoplasm / Q000187:drug effects / Q000235:genetics; D059865:Endoplasmic Reticulum Stress / Q000187:drug effects*; D004789:Enzyme Activation / Q000187:drug effects; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D000073864:Histone Deacetylase 6; D056572:Histone Deacetylase Inhibitors / Q000494:pharmacology; D006655:Histone Deacetylases / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D006877:Hydroxamic Acids / Q000008:administration & dosage; D007211:Indoles / Q000008:administration & dosage; D008545:Melanoma / Q000188:drug therapy* / Q000235:genetics / Q000473:pathology; D058990:Molecular Targeted Therapy / Q000379:methods; D009154:Mutation; D048493:Proto-Oncogene Proteins B-raf / Q000235:genetics*; D011743:Pyrimidines / Q000008:administration & dosage; D013449:Sulfonamides / Q000008:administration & dosage; D000077484:Vemurafenib
chemical_list: D056572:Histone Deacetylase Inhibitors; D006877:Hydroxamic Acids; D007211:Indoles; D011743:Pyrimidines; D013449:Sulfonamides; D000077484:Vemurafenib; C482119:BRAF protein, human; D048493:Proto-Oncogene Proteins B-raf; D048049:Extracellular Signal-Regulated MAP Kinases; C433811:HDAC6 protein, human; D000073864:Histone Deacetylase 6; D006655:Histone Deacetylases; C572255:ricolinostat