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Ho U, Luff J, James A, Lee CS, Quek H, Lai HC, Apte S, Lim YC, Lavin MF, Roberts TL. SMG1 heterozygosity exacerbates haematopoietic cancer development in Atm null mice by increasing persistent DNA damage and oxidative stress. J Cell Mol Med 2019; 23:8151-8160. [PMID: 31565865 PMCID: PMC6850945 DOI: 10.1111/jcmm.14685] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2019] [Revised: 04/25/2019] [Accepted: 05/15/2019] [Indexed: 12/20/2022] Open
Abstract
Suppressor of morphogenesis in genitalia 1 (SMG1) and ataxia telangiectasia mutated (ATM) are members of the PI3‐kinase like–kinase (PIKK) family of proteins. ATM is a well‐established tumour suppressor. Loss of one or both alleles of ATM results in an increased risk of cancer development, particularly haematopoietic cancer and breast cancer in both humans and mouse models. In mice, total loss of SMG1 is embryonic lethal and loss of a single allele results in an increased rate of cancer development, particularly haematopoietic cancers and lung cancer. In this study, we generated mice deficient in Atm and lacking one allele of Smg1, Atm−/−Smg1gt/+ mice. These mice developed cancers more rapidly than either of the parental genotypes, and all cancers were haematopoietic in origin. The combined loss of Smg1 and Atm resulted in a higher level of basal DNA damage and oxidative stress in tissues than loss of either gene alone. Furthermore, Atm−/−Smg1gt/+ mice displayed increased cytokine levels in haematopoietic tissues compared with wild‐type animals indicating the development of low‐level inflammation and a pro‐tumour microenvironment. Overall, our data demonstrated that combined loss of Atm expression and decreased Smg1 expression increases haematopoietic cancer development.
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Affiliation(s)
- Uda Ho
- School of Biomedical Sciences, Faculty of Medicine, University of Queensland, St Lucia, Qld, Australia
| | - John Luff
- UQCCR, University of Queensland, Brisbane, Qld, Australia
| | - Alexander James
- The Ingham Institute for Applied Medical Research and School of Medicine, Western Sydney University, Liverpool, NSW, Australia
| | - Cheok Soon Lee
- The Ingham Institute for Applied Medical Research and School of Medicine, Western Sydney University, Liverpool, NSW, Australia.,South West Sydney Clinical School, UNSW Sydney, Liverpool, NSW, Australia.,Department of Anatomical Pathology, Molecular Pathology Laboratory, Liverpool Hospital, Liverpool, NSW, Australia
| | - Hazel Quek
- UQCCR, University of Queensland, Brisbane, Qld, Australia.,QIMR Berghofer Medical Research Institute, Herston, Qld, Australia
| | - Hui-Chi Lai
- The Ingham Institute for Applied Medical Research and School of Medicine, Western Sydney University, Liverpool, NSW, Australia.,South West Sydney Clinical School, UNSW Sydney, Liverpool, NSW, Australia
| | - Simon Apte
- QIMR Berghofer Medical Research Institute, Herston, Qld, Australia
| | - Yi Chieh Lim
- QIMR Berghofer Medical Research Institute, Herston, Qld, Australia.,Danish Cancer Society Research Centre, Copenhagen, Denmark
| | - Martin F Lavin
- UQCCR, University of Queensland, Brisbane, Qld, Australia
| | - Tara L Roberts
- UQCCR, University of Queensland, Brisbane, Qld, Australia.,The Ingham Institute for Applied Medical Research and School of Medicine, Western Sydney University, Liverpool, NSW, Australia.,South West Sydney Clinical School, UNSW Sydney, Liverpool, NSW, Australia
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