title: Histone H4 expression is cooperatively maintained by IKKβ and Akt1 which attenuates cisplatin-induced apoptosis through the DNA-PK/RIP1/IAPs signaling cascade.
abstract: While chromatin remodeling mediated by post-translational modification of histone is extensively studied in carcinogenesis and cancer cell's response to chemotherapy and radiotherapy, little is known about the role of histone expression in chemoresistance. Here we report a novel chemoresistance mechanism involving histone H4 expression. Extended from our previous studies showing that concurrent blockage of the NF-κB and Akt signaling pathways sensitizes lung cancer cells to cisplatin-induced apoptosis, we for the first time found that knockdown of Akt1 and the NF-κB-activating kinase IKKβ cooperatively downregulated histone H4 expression, which increased cisplatin-induced apoptosis in lung cancer cells. The enhanced cisplatin cytotoxicity in histone H4 knockdown cells was associated with proteasomal degradation of RIP1, accumulation of cellular ROS and degradation of IAPs (cIAP1 and XIAP). The cisplatin-induced DNA-PK activation was suppressed in histone H4 knockdown cells, and inhibiting DNA-PK reduced expression of RIP1 and IAPs in cisplatin-treated cells. These results establish a novel mechanism by which NF-κB and Akt contribute to chemoresistance involving a signaling pathway consisting of histone H4, DNA-PK, RIP1 and IAPs that attenuates ROS-mediated apoptosis, and targeting this pathway may improve the anticancer efficacy of platinum-based chemotherapy.
authors.affiliation: Laboratory of Molecular and Translational Medicine, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University) of Ministry of Education, Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Chengdu 610041, China.
authors.forename: Ruixue
authors.initials: R
authors.lastname: Wang
authors.affiliation: Laboratory of Molecular and Translational Medicine, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University) of Ministry of Education, Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Chengdu 610041, China.
authors.forename: Xuelian
authors.initials: X
authors.lastname: Zheng
authors.affiliation: Laboratory of Molecular and Translational Medicine, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University) of Ministry of Education, Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Chengdu 610041, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Laboratory of Molecular and Translational Medicine, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University) of Ministry of Education, Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Chengdu 610041, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Zhou
authors.affiliation: Laboratory of Molecular and Translational Medicine, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University) of Ministry of Education, Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Chengdu 610041, China.
authors.forename: Huaizhong
authors.initials: H
authors.lastname: Hu
authors.affiliation: Department of Abdominal Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China.
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Li
authors.affiliation: Laboratory of Molecular and Translational Medicine, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University) of Ministry of Education, Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Chengdu 610041, China.|Department of Immunology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu 610041, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Laboratory of Molecular and Translational Medicine, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University) of Ministry of Education, Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Chengdu 610041, China.|Molecular Biology and Lung Cancer Program, Lovelace Respiratory Research Institute, 2425 Ridgecrest Dr., SE., Albuquerque NM 87108, USA.
authors.forename: Yong
authors.initials: Y
authors.lastname: Lin
authors.affiliation: Laboratory of Molecular and Translational Medicine, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University) of Ministry of Education, Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Chengdu 610041, China.|Department of Immunology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu 610041, China.
authors.forename: Xia
authors.initials: X
authors.lastname: Wang
mesh_terms: D017209:Apoptosis / Q000187:drug effects*; D045744:Cell Line, Tumor; D002945:Cisplatin / Q000494:pharmacology*; D051747:DNA-Activated Protein Kinase / Q000378:metabolism*; D005786:Gene Expression Regulation; D055785:Gene Knockdown Techniques; D006657:Histones / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D051550:I-kappa B Kinase / Q000235:genetics / Q000378:metabolism*; D028861:Nuclear Pore Complex Proteins / Q000378:metabolism*; D046988:Proteasome Endopeptidase Complex / Q000378:metabolism; D059748:Proteolysis; D051057:Proto-Oncogene Proteins c-akt / Q000235:genetics / Q000378:metabolism*; D016601:RNA-Binding Proteins / Q000378:metabolism*; D017382:Reactive Oxygen Species / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects*
chemical_list: C119724:AGFG1 protein, human; D006657:Histones; D028861:Nuclear Pore Complex Proteins; D016601:RNA-Binding Proteins; D017382:Reactive Oxygen Species; D051747:DNA-Activated Protein Kinase; D051057:Proto-Oncogene Proteins c-akt; D051550:I-kappa B Kinase; D046988:Proteasome Endopeptidase Complex; D002945:Cisplatin