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Abstract
Recruitment and activation of the ataxia telangiectasia mutated (ATM) kinase regulate multiple cell-cycle checkpoints relevant to complex biological events like DNA damage repair and apoptosis. Molecularly specific readouts of ATM using protein assays, fluorescence, or radiolabeling have advanced significantly over the past few years. This Review covers the molecular imaging techniques that enable the visualization of ATM-from traditional quantitative protein assays to the potential use of ATM inhibitors to generate new imaging agents to interrogate ATM. We are confident that molecular imaging coupled with advanced technologies will play a pivotal role in visualizing and understanding the biology of ATM and accelerate its applications in the diagnosis and monitoring of disease, including radiation therapy and patient stratification.
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Affiliation(s)
- Cien Huang
- Department of Radiology, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, United States.,City University of New York Hunter College, 695 Park Avenue, New York, New York 10065, United States
| | - Nina R Filippone
- Department of Radiology, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, United States.,State University of New York Binghamton University, 4400 Vestal Parkway, East Binghamton, New York 13902, United States
| | - Thomas Reiner
- Department of Radiology, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, United States.,Chemical Biology Program, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, United States.,Department of Radiology, Weill Cornell Medical College, 1300 York Avenue, New York, New York 10065, United States
| | - Sheryl Roberts
- Department of Radiology, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, United States
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Bryant J, White L, Coen N, Shields L, McClean B, Meade AD, Lyng FM, Howe O. MicroRNA Analysis of ATM-Deficient Cells Indicate PTEN and CCDN1 as Potential Biomarkers of Radiation Response. Radiat Res 2020; 193:520-530. [PMID: 32216710 DOI: 10.1667/rr15462.1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Accepted: 03/06/2020] [Indexed: 11/03/2022]
Abstract
Genetic and epigenetic profile changes associated with individual radiation sensitivity are well documented and have led to enhanced understanding of the mechanisms of the radiation-induced DNA damage response. However, the search continues to identify reliable biomarkers of individual radiation sensitivity. Herein, we report on a multi-biomarker approach using traditional cytogenetic biomarkers, DNA damage biomarkers and transcriptional microRNA (miR) biomarkers coupled with their potential gene targets to identify radiosensitivity in ataxia-telangiectasia mutated (ATM)-deficient lymphoblastoid cell lines (LCL); ATM-proficient cell lines were used as controls. Cells were 0.05 and 0.5 Gy irradiated, using a linear accelerator, with sham-irradiated cells as controls. At 1 h postirradiation, cells were fixed for γ-H2AX analysis as a measurement of DNA damage, and cytogenetic analysis using the G2 chromosomal sensitivity assay, G-banding and FISH techniques. RNA was also isolated for genetic profiling by microRNA (miR) and RT-PCR analysis. A panel of 752 miR were analyzed, and potential target genes, phosphatase and tensin homolog (PTEN) and cyclin D1 (CCND1), were measured. The cytogenetic assays revealed that although the control cell line had functional cell cycle checkpoints, the radiosensitivity of the control and AT cell lines were similar. Analysis of DNA damage in all cell lines, including an additional control cell line, showed elevated γ-H2AX levels for only one AT cell line. Of the 752 miR analyzed, eight miR were upregulated, and six miR were downregulated in the AT cells compared to the control. Upregulated miR-152-3p, miR-24-5p and miR-92-15p and all downregulated miR were indicated as modulators of PTEN and CCDN1. Further measurement of both genes validated their potential role as radiation-response biomarkers. The multi-biomarker approach not only revealed potential candidates for radiation response, but provided additional mechanistic insights into the response in AT-deficient cells.
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Affiliation(s)
- Jane Bryant
- Radiation and Environmental Science Centre (RESC), FOCAS Research Institute
| | - Lisa White
- Radiation and Environmental Science Centre (RESC), FOCAS Research Institute.,School of Biological and Health Sciences, Technological University Dublin, City Campus, Dublin 8, Ireland
| | - Natasha Coen
- Department of Clinical Genetics, Division of Cytogenetics, Our Lady's Children's Hospital, Crumlin, Dublin 12, Ireland
| | - Laura Shields
- Medical Physics Department, St Luke's Radiation Oncology Centre, Rathgar, Dublin 6, Ireland
| | - Brendan McClean
- Medical Physics Department, St Luke's Radiation Oncology Centre, Rathgar, Dublin 6, Ireland
| | - Aidan D Meade
- Radiation and Environmental Science Centre (RESC), FOCAS Research Institute.,School of Physics & Clinical & Optometric Sciences, Technological University Dublin, City Campus, Dublin 8, Ireland
| | - Fiona M Lyng
- Radiation and Environmental Science Centre (RESC), FOCAS Research Institute.,School of Physics & Clinical & Optometric Sciences, Technological University Dublin, City Campus, Dublin 8, Ireland
| | - Orla Howe
- Radiation and Environmental Science Centre (RESC), FOCAS Research Institute.,School of Biological and Health Sciences, Technological University Dublin, City Campus, Dublin 8, Ireland
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Li Y, Cucinotta FA. Mathematical Model of ATM Activation and Chromatin Relaxation by Ionizing Radiation. Int J Mol Sci 2020; 21:E1214. [PMID: 32059363 DOI: 10.3390/ijms21041214] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 01/29/2020] [Accepted: 02/09/2020] [Indexed: 12/24/2022] Open
Abstract
We propose a comprehensive mathematical model to study the dynamics of ionizing radiation induced Ataxia-telangiectasia mutated (ATM) activation that consists of ATM activation through dual mechanisms: the initiative activation pathway triggered by the DNA damage-induced local chromatin relaxation and the primary activation pathway consisting of a self-activation loop by interplay with chromatin relaxation. The model is expressed as a series of biochemical reactions, governed by a system of differential equations and analyzed by dynamical systems techniques. Radiation induced double strand breaks (DSBs) cause rapid local chromatin relaxation, which is independent of ATM but initiates ATM activation at damage sites. Key to the model description is how chromatin relaxation follows when active ATM phosphorylates KAP-1, which subsequently spreads throughout the chromatin and induces global chromatin relaxation. Additionally, the model describes how oxidative stress activation of ATM triggers a self-activation loop in which PP2A and ATF2 are released so that ATM can undergo autophosphorylation and acetylation for full activation in relaxed chromatin. In contrast, oxidative stress alone can partially activate ATM because phosphorylated ATM remains as a dimer. The model leads to predictions on ATM mediated responses to DSBs, oxidative stress, or both that can be tested by experiments.
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