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Daddacha W, Monroe D, Schlafstein A, Withers A, Thompson E, Danelia D, Luong N, Sesay F, Rath S, Usoro E, Essien M, Jung A, Jiang J, Hu J, Mahboubi B, Williams A, Steinbeck J, Yang X, Buchwald Z, Dynan W, Switchenko J, Kim B, Khan M, Jaye D, Yu D. SAMHD1 expression contributes to doxorubicin resistance and predicts survival outcomes in diffuse large B-cell lymphoma patients. NAR Cancer 2024; 6:zcae007. [PMID: 38406263 PMCID: PMC10894040 DOI: 10.1093/narcan/zcae007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 01/31/2024] [Accepted: 02/22/2024] [Indexed: 02/27/2024] Open
Abstract
Diffuse large B-cell lymphoma (DLBCL) is a commonly diagnosed, aggressive non-Hodgkin's lymphoma. While R-CHOP chemoimmunotherapy is potentially curative, about 40% of DLBCL patients will fail, highlighting the need to identify biomarkers to optimize management. SAMHD1 has a dNTPase-independent role in promoting resection to facilitate DNA double-strand break (DSB) repair by homologous recombination. We evaluated the relationship of SAMHD1 levels with sensitivity to DSB-sensitizing agents in DLBCL cells and the association of SAMHD1 expression with clinical outcomes in 79 DLBCL patients treated with definitive therapy and an independent cohort dataset of 234 DLBCL patients. Low SAMHD1 expression, Vpx-mediated, or siRNA-mediated degradation/depletion in DLBCL cells was associated with greater sensitivity to doxorubicin and PARP inhibitors. On Kaplan-Meier log-rank survival analysis, low SAMHD1 expression was associated with improved overall survival (OS), which on subset analysis remained significant only in patients with advanced stage (III-IV) and moderate to high risk (2-5 International Prognostic Index (IPI)). The association of low SAMHD1 expression with improved OS remained significant on multivariate analysis independent of other adverse factors, including IPI, and was validated in an independent cohort. Our findings suggest that SAMHD1 expression mediates doxorubicin resistance and may be an important prognostic biomarker in advanced, higher-risk DLBCL patients.
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Affiliation(s)
- Waaqo Daddacha
- Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, GA 30912, USA
| | - Dominique Monroe
- Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, GA 30912, USA
| | - Ashley J Schlafstein
- Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Allison E Withers
- Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Elizabeth B Thompson
- Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Diana Danelia
- Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Nho C Luong
- Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Fatmata Sesay
- Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Sandip K Rath
- Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Edidiong R Usoro
- Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, GA 30912, USA
| | - Mark E Essien
- Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Andrew T Jung
- Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Jinmeng G Jiang
- Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Jiaxuan Hu
- Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Bijan Mahboubi
- Department of Pediatrics, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Arilyn Williams
- Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, GA 30912, USA
| | - Julia E Steinbeck
- Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, GA 30912, USA
| | - Xiaofeng Yang
- Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Zachary S Buchwald
- Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - William S Dynan
- Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Jeffrey M Switchenko
- Department of Biostatistics and Bioinformatics, Rollins School of Public Health and Winship Cancer Institute, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Baek Kim
- Department of Pediatrics, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Mohammad K Khan
- Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - David L Jaye
- Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - David S Yu
- Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA
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Head PE, Kapoor-Vazirani P, Nagaraju GP, Zhang H, Rath S, Luong N, Haji-Seyed-Javadi R, Sesay F, Wang SY, Duong D, Daddacha W, Minten E, Song B, Danelia D, Liu X, Li S, Ortlund E, Seyfried N, Smalley D, Wang Y, Deng X, Dynan W, El-Rayes B, Davis A, Yu D. DNA-PK is activated by SIRT2 deacetylation to promote DNA double-strand break repair by non-homologous end joining. Nucleic Acids Res 2023; 51:7972-7987. [PMID: 37395399 PMCID: PMC10450170 DOI: 10.1093/nar/gkad549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 06/02/2023] [Accepted: 06/27/2023] [Indexed: 07/04/2023] Open
Abstract
DNA-dependent protein kinase (DNA-PK) plays a critical role in non-homologous end joining (NHEJ), the predominant pathway that repairs DNA double-strand breaks (DSB) in response to ionizing radiation (IR) to govern genome integrity. The interaction of the catalytic subunit of DNA-PK (DNA-PKcs) with the Ku70/Ku80 heterodimer on DSBs leads to DNA-PK activation; however, it is not known if upstream signaling events govern this activation. Here, we reveal a regulatory step governing DNA-PK activation by SIRT2 deacetylation, which facilitates DNA-PKcs localization to DSBs and interaction with Ku, thereby promoting DSB repair by NHEJ. SIRT2 deacetylase activity governs cellular resistance to DSB-inducing agents and promotes NHEJ. SIRT2 furthermore interacts with and deacetylates DNA-PKcs in response to IR. SIRT2 deacetylase activity facilitates DNA-PKcs interaction with Ku and localization to DSBs and promotes DNA-PK activation and phosphorylation of downstream NHEJ substrates. Moreover, targeting SIRT2 with AGK2, a SIRT2-specific inhibitor, augments the efficacy of IR in cancer cells and tumors. Our findings define a regulatory step for DNA-PK activation by SIRT2-mediated deacetylation, elucidating a critical upstream signaling event initiating the repair of DSBs by NHEJ. Furthermore, our data suggest that SIRT2 inhibition may be a promising rationale-driven therapeutic strategy for increasing the effectiveness of radiation therapy.
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Affiliation(s)
- PamelaSara E Head
- Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine,Atlanta, GA 30322, USA
| | - Priya Kapoor-Vazirani
- Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine,Atlanta, GA 30322, USA
| | - Ganji P Nagaraju
- School of Medicine, Division of Hematology and Medical Oncology, University of Alabama, Birmingham, AL 35233, USA
| | - Hui Zhang
- Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine,Atlanta, GA 30322, USA
| | - Sandip K Rath
- Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine,Atlanta, GA 30322, USA
| | - Nho C Luong
- Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine,Atlanta, GA 30322, USA
| | - Ramona Haji-Seyed-Javadi
- Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine,Atlanta, GA 30322, USA
| | - Fatmata Sesay
- Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine,Atlanta, GA 30322, USA
| | - Shi-Ya Wang
- Department of Radiation Oncology, UT Southwestern Medical School, Dallas, TX 75390, USA
| | - Duc M Duong
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Waaqo Daddacha
- Department of Biochemistry and Molecular Biology, Augusta University, Augusta, GA 30912, USA
| | - Elizabeth V Minten
- Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine,Atlanta, GA 30322, USA
| | - Boying Song
- Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine,Atlanta, GA 30322, USA
| | - Diana Danelia
- Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine,Atlanta, GA 30322, USA
| | - Xu Liu
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Shuyi Li
- Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine,Atlanta, GA 30322, USA
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Eric A Ortlund
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Nicholas T Seyfried
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - David M Smalley
- Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Ya Wang
- Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine,Atlanta, GA 30322, USA
| | - Xingming Deng
- Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine,Atlanta, GA 30322, USA
| | - William S Dynan
- Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine,Atlanta, GA 30322, USA
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Bassel El-Rayes
- School of Medicine, Division of Hematology and Medical Oncology, University of Alabama, Birmingham, AL 35233, USA
| | - Anthony J Davis
- Department of Radiation Oncology, UT Southwestern Medical School, Dallas, TX 75390, USA
| | - David S Yu
- Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine,Atlanta, GA 30322, USA
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Kapoor-Vazirani P, Rath SK, Liu X, Shu Z, Bowen NE, Chen Y, Haji-Seyed-Javadi R, Daddacha W, Minten EV, Danelia D, Farchi D, Duong DM, Seyfried NT, Deng X, Ortlund EA, Kim B, Yu DS. SAMHD1 deacetylation by SIRT1 promotes DNA end resection by facilitating DNA binding at double-strand breaks. Nat Commun 2022; 13:6707. [PMID: 36344525 PMCID: PMC9640623 DOI: 10.1038/s41467-022-34578-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 10/29/2022] [Indexed: 11/09/2022] Open
Abstract
Sterile alpha motif and HD domain-containing protein 1 (SAMHD1) has a dNTPase-independent function in promoting DNA end resection to facilitate DNA double-strand break (DSB) repair by homologous recombination (HR); however, it is not known if upstream signaling events govern this activity. Here, we show that SAMHD1 is deacetylated by the SIRT1 sirtuin deacetylase, facilitating its binding with ssDNA at DSBs, to promote DNA end resection and HR. SIRT1 complexes with and deacetylates SAMHD1 at conserved lysine 354 (K354) specifically in response to DSBs. K354 deacetylation by SIRT1 promotes DNA end resection and HR but not SAMHD1 tetramerization or dNTPase activity. Mechanistically, K354 deacetylation by SIRT1 promotes SAMHD1 recruitment to DSBs and binding to ssDNA at DSBs, which in turn facilitates CtIP ssDNA binding, leading to promotion of genome integrity. These findings define a mechanism governing the dNTPase-independent resection function of SAMHD1 by SIRT1 deacetylation in promoting HR and genome stability.
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Affiliation(s)
- Priya Kapoor-Vazirani
- grid.189967.80000 0001 0941 6502Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Sandip K. Rath
- grid.189967.80000 0001 0941 6502Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Xu Liu
- grid.189967.80000 0001 0941 6502Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Zhen Shu
- grid.189967.80000 0001 0941 6502Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Nicole E. Bowen
- grid.189967.80000 0001 0941 6502Department of Pediatrics, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Yitong Chen
- grid.189967.80000 0001 0941 6502Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Ramona Haji-Seyed-Javadi
- grid.189967.80000 0001 0941 6502Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Waaqo Daddacha
- grid.410427.40000 0001 2284 9329Department of Biochemistry and Molecular Biology, Medical College of Georgia at Augusta University, Augusta, GA 30912 USA
| | - Elizabeth V. Minten
- grid.189967.80000 0001 0941 6502Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Diana Danelia
- grid.189967.80000 0001 0941 6502Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Daniela Farchi
- grid.189967.80000 0001 0941 6502Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Duc M. Duong
- grid.189967.80000 0001 0941 6502Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Nicholas T. Seyfried
- grid.189967.80000 0001 0941 6502Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Xingming Deng
- grid.189967.80000 0001 0941 6502Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Eric A. Ortlund
- grid.189967.80000 0001 0941 6502Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Baek Kim
- grid.189967.80000 0001 0941 6502Department of Pediatrics, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - David S. Yu
- grid.189967.80000 0001 0941 6502Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine, Atlanta, GA 30322 USA
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