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Chen Z, Wang X, Yan Z, Zhang M. Identification of tumor antigens and immune subtypes of glioma for mRNA vaccine development. Cancer Med 2022; 11:2711-2726. [PMID: 35285582 PMCID: PMC9249984 DOI: 10.1002/cam4.4633] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 01/15/2022] [Accepted: 02/09/2022] [Indexed: 01/02/2023] Open
Abstract
Recent evidence suggested that the mRNA vaccine has been effective for many tumors, but its progress in gliomas was slow. In this study, we screened potential tumor antigens and suitable populations for mRNA vaccine to develop mRNA vaccine for glioma. We integrated the normalized RNA sequencing expression data and somatic mutation data from TCGA-GBM, TCGA-LGG, and CGGA datasets. Putative antigens in glioma were identified by selecting highly mutated genes with intimate correlation with clinical survival and immune infiltration. An unsupervised partition around medoids algorithm was utilized to stably cluster the patients into five different immune subtypes. Among them, IS1/2 was cold tumor with low tumor mutation burden (TMB), immunogenic cell death (ICDs), and immune checkpoints (ICPs), and IS4/5 was hot tumor with high TMB, ICDs, and ICPs. Monocle3 package was used to evaluate the immune status similarity and evolution in glioma, which identified cluster IS2A/2B within IS2 subtype to be more suitable vaccination receivers. Weighted gene co-expression network analysis identified five hub immune genes as the biomarkers of patients' immune status in glioma. In conclusion, NAT1, FRRS1, GTF2H2C, BRCA2, GRAP, NR5A2, ABCB4, ZNF90, ERCC6L, and ZNF813 are potential antigens suitable for glioma mRNA vaccine. IS1/2A/2B are suitable for mRNA vaccination.
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Affiliation(s)
- Zhuohui Chen
- Department of Neurology, Xiangya HospitalCentral South UniversityChangshaChina
- National Clinical Research Center for Geriatric DisordersXiangya HospitalCentral South UniversityChangshaChina
| | - Xiang Wang
- Department of Neurology, Xiangya HospitalCentral South UniversityChangshaChina
- National Clinical Research Center for Geriatric DisordersXiangya HospitalCentral South UniversityChangshaChina
| | - Zhouyi Yan
- Department of Neurology, Xiangya HospitalCentral South UniversityChangshaChina
- National Clinical Research Center for Geriatric DisordersXiangya HospitalCentral South UniversityChangshaChina
| | - Mengqi Zhang
- Department of Neurology, Xiangya HospitalCentral South UniversityChangshaChina
- National Clinical Research Center for Geriatric DisordersXiangya HospitalCentral South UniversityChangshaChina
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2
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Peng J, Liang Q, Xu Z, Cai Y, Peng B, Li J, Zhang W, Kang F, Hong Q, Yan Y, Zhang M. Current Understanding of Exosomal MicroRNAs in Glioma Immune Regulation and Therapeutic Responses. Front Immunol 2022; 12:813747. [PMID: 35095909 PMCID: PMC8796999 DOI: 10.3389/fimmu.2021.813747] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 12/27/2021] [Indexed: 02/05/2023] Open
Abstract
Exosomes, the small extracellular vesicles, are released by multiple cell types, including tumor cells, and represent a novel avenue for intercellular communication via transferring diverse biomolecules. Recently, microRNAs (miRNAs) were demonstrated to be enclosed in exosomes and therefore was protected from degradation. Such exosomal miRNAs can be transmitted to recipient cells where they could regulate multiple cancer-associated biological processes. Accumulative evidence suggests that exosomal miRNAs serve essential roles in modifying the glioma immune microenvironment and potentially affecting the malignant behaviors and therapeutic responses. As exosomal miRNAs are detectable in almost all kinds of biofluids and correlated with clinicopathological characteristics of glioma, they might be served as promising biomarkers for gliomas. We reviewed the novel findings regarding the biological functions of exosomal miRNAs during glioma pathogenesis and immune regulation. Furthermore, we elaborated on their potential clinical applications as biomarkers in glioma diagnosis, prognosis and treatment response prediction. Finally, we summarized the accessible databases that can be employed for exosome-associated miRNAs identification and functional exploration of cancers, including glioma.
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Affiliation(s)
- Jinwu Peng
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, China.,Department of Pathology, Xiangya Changde Hospital, Changde, China
| | - Qiuju Liang
- Department of Pharmacy, Xiangya Hospital, Central South University, Changsha, China
| | - Zhijie Xu
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, China.,Department of Pathology, Xiangya Changde Hospital, Changde, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Yuan Cai
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, China
| | - Bi Peng
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, China
| | - Jianbo Li
- Department of Pathology, Xiangya Changde Hospital, Changde, China
| | - Wenqin Zhang
- Department of Pathology, Xiangya Changde Hospital, Changde, China
| | - Fanhua Kang
- Department of Pathology, Xiangya Changde Hospital, Changde, China
| | - Qianhui Hong
- Department of Pathology, Xiangya Changde Hospital, Changde, China
| | - Yuanliang Yan
- Department of Pharmacy, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Mingyu Zhang
- Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
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3
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Peter K, Kar SK, Gothalwal R, Gandhi P. Curcumin in Combination with Other Adjunct Therapies for Brain Tumor Treatment: Existing Knowledge and Blueprint for Future Research. INTERNATIONAL JOURNAL OF MOLECULAR AND CELLULAR MEDICINE 2022; 10:163-181. [PMID: 35178355 PMCID: PMC8800460 DOI: 10.22088/ijmcm.bums.10.3.163] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 01/03/2022] [Indexed: 12/12/2022]
Abstract
Malignant brain tumors proliferate aggressively and have a debilitating outcome. Surgery followed by chemo-radiotherapy has been the standard procedure of care since 2005 but issues of therapeutic toxicity and relapse still remain unaddressed. Repurposing of drugs to develop novel combinations that can augment existing treatment regimens for brain tumors is the need of the hour. Herein, we discuss studies documenting the use of curcumin as an adjuvant to conventional and alternative therapies for brain tumors. Comprehensive analysis of data suggests that curcumin together with available therapies can generate a synergistic action achieved through multiple molecular targeting, which results in simultaneous inhibition of tumor growth, and reduced treatment-induced toxicity as well as resistance. The review also highlights approaches to increase bioavailability and bioaccumulation of drugs when co-delivered with curcumin using nano-cargos. Despite substantial preclinical work on radio-chemo sensitizing effects of curcumin, to date, there is only a single clinical report on brain tumors. Based on available lab evidence, it is proposed that antibody-conjugated nano-curcumin in combination with sub-toxic doses of conventional or repurposed therapeutics should be designed and tested in clinical studies. This will increase tumor targeting, the bioavailability of the drug combination, reduce therapy resistance, and tumor recurrence through modulation of aberrant signaling cascades; thus improving clinical outcomes in brain malignancies.
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Affiliation(s)
- Kavita Peter
- Department of Biotechnology, Barkatullah University, Bhopal, M.P, India
| | | | - Ragini Gothalwal
- Department of Biotechnology, Barkatullah University, Bhopal, M.P, India
| | - Puneet Gandhi
- Department of Research, Bhopal Memorial Hospital and Research Centre, Bhopal, M.P, India
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4
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Rominiyi O, Collis SJ. DDRugging glioblastoma: understanding and targeting the DNA damage response to improve future therapies. Mol Oncol 2022; 16:11-41. [PMID: 34036721 PMCID: PMC8732357 DOI: 10.1002/1878-0261.13020] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 05/11/2021] [Accepted: 05/24/2021] [Indexed: 12/13/2022] Open
Abstract
Glioblastoma is the most frequently diagnosed type of primary brain tumour in adults. These aggressive tumours are characterised by inherent treatment resistance and disease progression, contributing to ~ 190 000 brain tumour-related deaths globally each year. Current therapeutic interventions consist of surgical resection followed by radiotherapy and temozolomide chemotherapy, but average survival is typically around 1 year, with < 10% of patients surviving more than 5 years. Recently, a fourth treatment modality of intermediate-frequency low-intensity electric fields [called tumour-treating fields (TTFields)] was clinically approved for glioblastoma in some countries after it was found to increase median overall survival rates by ~ 5 months in a phase III randomised clinical trial. However, beyond these treatments, attempts to establish more effective therapies have yielded little improvement in survival for patients over the last 50 years. This is in contrast to many other types of cancer and highlights glioblastoma as a recognised tumour of unmet clinical need. Previous work has revealed that glioblastomas contain stem cell-like subpopulations that exhibit heightened expression of DNA damage response (DDR) factors, contributing to therapy resistance and disease relapse. Given that radiotherapy, chemotherapy and TTFields-based therapies all impact DDR mechanisms, this Review will focus on our current knowledge of the role of the DDR in glioblastoma biology and treatment. We also discuss the potential of effective multimodal targeting of the DDR combined with standard-of-care therapies, as well as emerging therapeutic targets, in providing much-needed improvements in survival rates for patients.
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Affiliation(s)
- Ola Rominiyi
- Weston Park Cancer CentreSheffieldUK
- Department of Oncology & MetabolismThe University of Sheffield Medical SchoolUK
- Department of NeurosurgeryRoyal Hallamshire HospitalSheffield Teaching Hospitals NHS Foundation TrustUK
| | - Spencer J. Collis
- Weston Park Cancer CentreSheffieldUK
- Department of Oncology & MetabolismThe University of Sheffield Medical SchoolUK
- Sheffield Institute for Nucleic Acids (SInFoNiA)University of SheffieldUK
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5
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Phon BWS, Kamarudin MNA, Bhuvanendran S, Radhakrishnan AK. Transitioning pre-clinical glioblastoma models to clinical settings with biomarkers identified in 3D cell-based models: A systematic scoping review. Biomed Pharmacother 2021; 145:112396. [PMID: 34775238 DOI: 10.1016/j.biopha.2021.112396] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2021] [Revised: 10/25/2021] [Accepted: 11/02/2021] [Indexed: 11/02/2022] Open
Abstract
Glioblastoma (GBM) remains incurable despite the overwhelming discovery of 2-dimensional (2D) cell-based potential therapeutics since the majority of them have met unsatisfactory results in animal and clinical settings. Incremental empirical evidence has laid the widespread need of transitioning 2D to 3-dimensional (3D) cultures that better mimic GBM's complex and heterogenic nature to allow better translation of pre-clinical results. This systematic scoping review analyses the transcriptomic data involving 3D models of GBM against 2D models from 22 studies identified from four databases (PubMed, ScienceDirect, Medline, and Embase). From a total of 499 genes reported in these studies, 313 (63%) genes were upregulated across 3D models cultured using different scaffolds. Our analysis showed that 4 of the replicable upregulated genes are associated with GBM stemness, epithelial to mesenchymal transition (EMT), hypoxia, and migration-related genes regardless of the type of scaffolds, displaying close resemblances to primitive undifferentiated tumour phenotypes that are associated with decreased overall survival and increased hazard ratio in GBM patients. The upregulation of drug response and drug efflux genes (e.g. cytochrome P450s and ABC transporters) mirrors the GBM genetic landscape that contributes to in vivo and clinical treatment resistance. These upregulated genes displayed strong protein-protein interactions when analysed using an online bioinformatics software (STRING). These findings reinforce the need for widespread transition to 3D GBM models as a relatively inexpensive humanised pre-clinical tool with suitable genetic biomarkers to bridge clinical gaps in potential therapeutic evaluations.
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Affiliation(s)
- Brandon Wee Siang Phon
- Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, Jalan Lagoon Selatan, 47500 Bandar Sunway, Selangor, Malaysia
| | - Muhamad N A Kamarudin
- Brain Research Institute Monash Sunway, Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, 47500 Bandar Sunway, Selangor, Malaysia.
| | - Saatheeyavaane Bhuvanendran
- Brain Research Institute Monash Sunway, Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, 47500 Bandar Sunway, Selangor, Malaysia
| | - Ammu K Radhakrishnan
- Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, Jalan Lagoon Selatan, 47500 Bandar Sunway, Selangor, Malaysia
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6
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Lee IN, Yang JT, Huang C, Huang HC, Wu YP, Chen JC. Elevated XRCC5 expression level can promote temozolomide resistance and predict poor prognosis in glioblastoma. Oncol Lett 2021; 21:443. [PMID: 33868481 PMCID: PMC8045174 DOI: 10.3892/ol.2021.12704] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Accepted: 03/04/2021] [Indexed: 12/13/2022] Open
Abstract
Drug resistance and disease recurrence are important contributors for the poor prognosis of glioblastoma multiforme (GBM). Temozolomide (TMZ), the standard chemotherapy for GBM treatment, can methylate DNA and cause the formation of double-strand breaks (DSBs). X-ray repair cross complementing 5 (XRCC5), also known as Ku80 or Ku86, is required for the repair of DSBs. The present study identified novel determinants that sensitize cells to TMZ, using an array-based short hairpin (sh)RNA library. Then, cBioportal, Oncomine, and R2 databases were used to analyze the association between gene expression levels and clinical characteristics. Subsequently, lentiviral shRNA or pCMV was used to knockdown or overexpress the gene of interest, and the effects on TMZ sensitivity were determined using a MTT assay and western blot analysis. TMZ-resistant cells were also established and were used in in vitro and in vivo experiments to analyze the role of the gene of interest in TMZ resistance. The results indicated that XRCC5 was effective in enhancing TMZ cytotoxicity. The results from the bioinformatics analysis revealed that XRCC5 mRNA expression levels were associated with clinical deterioration and lower overall survival rates. In addition, XRCC5 knockdown could significantly increase TMZ sensitivity in GBM cells, while XRCC5 overexpression caused the cancer cells to be resistant to TMZ. Both the in vivo and in vitro experiments showed that TMZ treatment could induce expression of XRCC5 in TMZ-resistant cells. Taken together these findings suggested that XRCC5 could be a promising target for GBM treatment and could also be used as a diagnostic marker for refractory GBM.
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Affiliation(s)
- I-Neng Lee
- Department of Medical Research, Chang Gung Memorial Hospital, Chiayi 61363, Taiwan, R.O.C
| | - Jen-Tsung Yang
- Department of Neurosurgery, Chang Gung Memorial Hospital, Chiayi 61363, Taiwan, R.O.C.,College of Medicine, Chang Gung University, Tao-Yuan 33302, Taiwan, R.O.C
| | - Cheng Huang
- Department of Biotechnology and Laboratory Science in Medicine, National Yang-Ming University, Taipei 11221, Taiwan, R.O.C.,Department of Earth and Life Sciences, University of Taipei, Taipei 11153, Taiwan, R.O.C
| | - Hsiu-Chen Huang
- Department of Applied Science, National Tsing Hua University South Campus, Hsinchu 30014, Taiwan, R.O.C
| | - Yu-Ping Wu
- Department of Medical Research, Chang Gung Memorial Hospital, Chiayi 61363, Taiwan, R.O.C
| | - Jui-Chieh Chen
- Department of Biochemical Science and Technology, National Chiayi University, Chiayi 60004, Taiwan, R.O.C
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7
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Fan J, Jiang H, Cheng L, Ma B, Liu R. Oncolytic herpes simplex virus and temozolomide synergistically inhibit breast cancer cell tumorigenesis in vitro and in vivo. Oncol Lett 2020; 21:99. [PMID: 33376532 PMCID: PMC7751368 DOI: 10.3892/ol.2020.12360] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Accepted: 09/23/2020] [Indexed: 12/13/2022] Open
Abstract
The oncolytic herpes simplex virus (HSV) G47Δ can selectively eliminate glioblastoma cells via viral replication and temozolomide (TMZ) has been clinically used to treat glioblastoma. However, the combined effect of G47Δ and TMZ on cancer cells, particularly on breast cancer cells, remains largely unknown. The objective of the present study was to investigate the role and underlying mechanism of G47Δ and TMZ, in combination, in breast cancer cell tumorigenesis. The human breast cancer cell lines SK-BR-3 and MDA-MB-468 were treated with G47Δ and TMZ individually or in combination. Cell viability, flow cytometry, reverse transcription quantitative-PCR and western blotting were performed to investigate the synergy between G47Δ and TMZ in regulating breast cancer cell behavior in vitro. The role of G47Δ and TMZ in suppressing tumorigenesis in vivo was investigated in a xenograft mouse model. G47Δ and TMZ served a synergistic role resulting in decreased breast cancer cell viability, induction of cell cycle arrest, promotion of tumor cell apoptosis and enhancement of DNA damage response in vitro. The combined administration of G47Δ and TMZ also effectively suppressed breast cancer cell-derived tumor growth in vivo, compared with the administration of G47Δ or TMZ alone. Synergy between G47Δ and TMZ was at least partially mediated via TMZ-induced acceleration of G47Δ replication, and such a synergy in breast cancer cells in vitro and in vivo provides novel insight into the future development of a therapeutic strategy against breast cancer.
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Affiliation(s)
- Jingjing Fan
- Department of Breast and Neck Surgery, Xinjiang Medical University Affiliated Tumor Hospital, Urumqi, Xinjiang 830011, P.R. China
| | - Hua Jiang
- Breast Cancer Center, Department of Breast and Thyroid Surgery, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510630, P.R. China
| | - Lin Cheng
- Breast Cancer Center, Department of Breast and Thyroid Surgery, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510630, P.R. China
| | - Binlin Ma
- Department of Breast and Neck Surgery, Xinjiang Medical University Affiliated Tumor Hospital, Urumqi, Xinjiang 830011, P.R. China
| | - Renbin Liu
- Breast Cancer Center, Department of Breast and Thyroid Surgery, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510630, P.R. China
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8
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Wang B, Wu ZH, Lou PY, Chai C, Han SY, Ning JF, Li M. Human bone marrow-derived mesenchymal stem cell-secreted exosomes overexpressing microRNA-34a ameliorate glioblastoma development via down-regulating MYCN. Cell Oncol (Dordr) 2019; 42:783-799. [PMID: 31332647 DOI: 10.1007/s13402-019-00461-z] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/17/2019] [Indexed: 12/20/2022] Open
Abstract
PURPOSE Exosomes play important roles in intercellular communication through signaling pathways affecting tumor microenvironment modulation and tumor proliferation, including those in glioblastoma (GBM). As yet, however, limited studies have been conducted on the inhibitory effect of human bone marrow-derived mesenchymal stem cell (hBMSC)-derived exosomes on GBM development. Therefore, we set out to assess the role of hBMSC secreted exosomes, in particular those carrying microRNA-34a (miR-34a), in the development of GBM. METHODS Microarray-based expression analysis was employed to identify differentially expressed genes and to predict miRNAs regulating MYCN expression. Next, hBMSCs were transfected with a miR-34a mimic or inhibitor after which exosomes were isolated. Proliferation, apoptosis, migration, invasion and temozolomide (TMZ) chemosensitivity of exosome-exposed GBM cells (T-98G, LN229 and A-172) were measured in vitro. The mechanism underlying MYCN regulation was investigated using lentiviral transfections. The in vivo inhibitory effect of exosomal miR-34a was measured in nude mice xenografted with GBM cells through subcutaneous injection of hBMSCs with an upregulated miR34a content. RESULTS We found that poorly-expressed miR-34a specifically targeted and negatively regulated the expression of MYCN in GBM cells. In addition we found that miR-34a was delivered to T-98G, LN229 and A-172 GBM cells via hBMSC-derived exosomes. Exogenous overexpression of miR-34a in hBMSC-derived exosomes resulted in inhibition of GBM cell proliferation, invasion, migration and tumorigenesis in vitro and in vivo, while promoting the chemosensitivity of GBM cells to TMZ by silencing MYCN. CONCLUSIONS From our data we conclude that hBMSC-derived exosomes overexpressing miR-34a may be instrumental for the therapeutic targeting and clinical management of GBM.
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Affiliation(s)
- Bin Wang
- Department of Neurosurgery, Henan Province People's Hospital, Zhengzhou University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan Province, People's Republic of China
- Department of Neurosurgery, People's Hospital Affiliated with Zhengzhou University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan Province, People's Republic of China
- Department of Neurosurgery, People's Hospital Affiliated with Medical college of Henan University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan Province, People's Republic of China
| | - Zhong-Hua Wu
- Department of Neurosurgery, Henan Province People's Hospital, Zhengzhou University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan Province, People's Republic of China
- Department of Neurosurgery, People's Hospital Affiliated with Zhengzhou University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan Province, People's Republic of China
- Department of Neurosurgery, People's Hospital Affiliated with Medical college of Henan University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan Province, People's Republic of China
| | - Ping-Yang Lou
- Department of Neurosurgery, Henan Province People's Hospital, Zhengzhou University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan Province, People's Republic of China
- Department of Neurosurgery, People's Hospital Affiliated with Zhengzhou University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan Province, People's Republic of China
- Department of Neurosurgery, People's Hospital Affiliated with Medical college of Henan University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan Province, People's Republic of China
| | - Chang Chai
- Department of Ophthalmology, Henan Province People's Hospital, Zhengzhou University, Zhengzhou, 450003, People's Republic of China
| | - Shuang-Yin Han
- Center for Translational Medicine, Henan Province People's Hospital, Zhengzhou University, Zhengzhou, 450003, People's Republic of China
| | - Jian-Fang Ning
- Department of Neurosurgery, University of Minnesota, Minneapolis, 55455, USA
| | - Ming Li
- Department of Neurosurgery, Henan Province People's Hospital, Zhengzhou University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan Province, People's Republic of China.
- Department of Neurosurgery, People's Hospital Affiliated with Zhengzhou University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan Province, People's Republic of China.
- Department of Neurosurgery, People's Hospital Affiliated with Medical college of Henan University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan Province, People's Republic of China.
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Colic M, Wang G, Zimmermann M, Mascall K, McLaughlin M, Bertolet L, Lenoir WF, Moffat J, Angers S, Durocher D, Hart T. Identifying chemogenetic interactions from CRISPR screens with drugZ. Genome Med 2019; 11:52. [PMID: 31439014 PMCID: PMC6706933 DOI: 10.1186/s13073-019-0665-3] [Citation(s) in RCA: 105] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 08/12/2019] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Chemogenetic profiling enables the identification of gene mutations that enhance or suppress the activity of chemical compounds. This knowledge provides insights into drug mechanism of action, genetic vulnerabilities, and resistance mechanisms, all of which may help stratify patient populations and improve drug efficacy. CRISPR-based screening enables sensitive detection of drug-gene interactions directly in human cells, but until recently has primarily been used to screen only for resistance mechanisms. RESULTS We present drugZ, an algorithm for identifying both synergistic and suppressor chemogenetic interactions from CRISPR screens. DrugZ identifies synthetic lethal interactions between PARP inhibitors and both known and novel members of the DNA damage repair pathway, confirms KEAP1 loss as a resistance factor for ERK inhibitors in oncogenic KRAS backgrounds, and defines the genetic context for temozolomide activity. CONCLUSIONS DrugZ is an open-source Python software for the analysis of genome-scale drug modifier screens. The software accurately identifies genetic perturbations that enhance or suppress drug activity. Interestingly, analysis of new and previously published data reveals tumor suppressor genes are drug-agnostic resistance genes in drug modifier screens. The software is available at github.com/hart-lab/drugz .
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Affiliation(s)
- Medina Colic
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
- UTHealth Graduate School of Biomedical Sciences, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Gang Wang
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Michal Zimmermann
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, 600 University Avenue, Toronto, ON, M5G 1X5, Canada
| | - Keith Mascall
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON, Canada
| | - Megan McLaughlin
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Lori Bertolet
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - W Frank Lenoir
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
- UTHealth Graduate School of Biomedical Sciences, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Jason Moffat
- Donnelly Centre, University of Toronto, Toronto, ON, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, ON, M5S 3E1, Canada
| | - Stephane Angers
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON, Canada
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Daniel Durocher
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, 600 University Avenue, Toronto, ON, M5G 1X5, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, ON, M5S 3E1, Canada
| | - Traver Hart
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
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10
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Kaina B, Christmann M. DNA repair in personalized brain cancer therapy with temozolomide and nitrosoureas. DNA Repair (Amst) 2019; 78:128-141. [PMID: 31039537 DOI: 10.1016/j.dnarep.2019.04.007] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 04/11/2019] [Accepted: 04/14/2019] [Indexed: 12/16/2022]
Abstract
Alkylating agents have been used since the 60ties in brain cancer chemotherapy. Their target is the DNA and, although the DNA of normal and cancer cells is damaged unselectively, they exert tumor-specific killing effects because of downregulation of some DNA repair activities in cancer cells. Agents exhibiting methylating properties (temozolomide, procarbazine, dacarbazine, streptozotocine) induce at least 12 different DNA lesions. These are repaired by damage reversal mechanisms involving the alkyltransferase MGMT and the alkB homologous protein ALKBH2, and through base excision repair (BER). There is a strong correlation between the MGMT expression level and therapeutic response in high-grade malignant glioma, supporting the notion that O6-methylguanine and, for nitrosoureas, O6-chloroethylguanine are the most relevant toxic damages at therapeutically relevant doses. Since MGMT has a significant impact on the outcome of anti-cancer therapy, it is a predictive marker of the effectiveness of methylating anticancer drugs, and clinical trials are underway aimed at assessing the influence of MGMT inhibition on the therapeutic success. Other DNA repair factors involved in methylating drug resistance are mismatch repair, DNA double-strand break (DSB) repair by homologous recombination (HR) and DSB signaling. Base excision repair and ALKBH2 might also contribute to alkylating drug resistance and their downregulation may have an impact on drug sensitivity notably in cells expressing a high amount of MGMT and at high doses of temozolomide, but the importance in a therapeutic setting remains to be shown. MGMT is frequently downregulated in cancer cells (up to 40% in glioblastomas), which is due to CpG promoter methylation. Astrocytoma (grade III) are frequently mutated in isocitrate dehydrogenase (IDH1). These tumors show a surprisingly good therapeutic response. IDH1 mutation has an impact on ALKBH2 activity thus influencing DNA repair. A master switch between survival and death is p53, which often retains transactivation activity (wildtype) in malignant glioma. The role of p53 in regulating survival via DNA repair and the routes of death are discussed and conclusions as to cancer therapeutic options were drawn.
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Affiliation(s)
- Bernd Kaina
- Institute of Toxicology, University Medical Center Mainz, Obere Zahlbacher Str. 67, D-55131 Mainz, Germany.
| | - Markus Christmann
- Institute of Toxicology, University Medical Center Mainz, Obere Zahlbacher Str. 67, D-55131 Mainz, Germany
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Shibahara T, Ikuta S, Muragaki Y. Machine-Learning Approach for Modeling Myelosuppression Attributed to Nimustine Hydrochloride. JCO Clin Cancer Inform 2019; 2:1-21. [PMID: 30652567 DOI: 10.1200/cci.17.00022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
PURPOSE A major adverse effect arising from nimustine hydrochloride (ACNU) therapy for brain tumors is myelosuppression. Because its timing and severity vary among individual patients, the ACNU dose level has been adjusted in an empiric manner at individual medical facilities. To our knowledge, ours is the first study to develop a machine-learning approach to estimate myelosuppression through analysis of patient factors before treatment and attempts to clarify the relationship between myelosuppression and hematopoietic stem cells from daily clinical data. Adverse effect prediction will allow ACNU dose adjustment for patients predicted to have decreases in blood cell counts and will enable focused follow-up of patients undergoing chemoradiotherapy. PATIENTS AND METHODS Patients were newly pathologically diagnosed with WHO grade 2 or 3 tumors and were treated with ACNU-based chemoradiotherapy. For detailed analysis of the timing and intensity of adverse effects in patients, we developed a data-weighted support vector machine (SVM) based on adverse event criteria (nadir-weighted SVM [NwSVM]). To evaluate the estimation accuracy of blood cell count dynamics, the determination coefficient ( r2) between real and estimated data was calculated by three regression methods: polynomial, SVM, and NwSVM. RESULTS Only the NwSVM-based regression enabled estimation of the dynamics of all blood cell types with high accuracy (mean r2 = 0.81). The mean timing of nadir arrival estimated using this regression was 35 days for platelets, 41 days for RBCs, 52 days for lymphocytes, 57 days for WBCs, and 62 days for neutrophils. CONCLUSION The NwSVM can be used to predict myelosuppression and clearly depicts nadir timing differences between platelets and other blood cells.
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Affiliation(s)
- Takuma Shibahara
- All authors: Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, Tokyo, Japan
| | - Soko Ikuta
- All authors: Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, Tokyo, Japan
| | - Yoshihiro Muragaki
- All authors: Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, Tokyo, Japan
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12
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PAXX Participates in Base Excision Repair via Interacting with Pol β and Contributes to TMZ Resistance in Glioma Cells. J Mol Neurosci 2018; 66:214-221. [PMID: 30238427 PMCID: PMC6182633 DOI: 10.1007/s12031-018-1157-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Accepted: 08/06/2018] [Indexed: 12/29/2022]
Abstract
Non-homologous end joining (NHEJ) is one of the major DNA repair pathway in mammalian cell that can ligate a variety of DNA ends. However, how does all NHEJ factors communicate and organize together to achieve the final repair is still not clear. PAralog of XRCC4 and XLF (PAXX) was a new factor identified recently that play an important role in NHEJ. PAXX contributes to efficient NHEJ by interacting with Ku, which is a NHEJ key factor, and PAXX deficiency cause sensitivity to DNA double-strand break repair (DSBR). We observed that PAXX-deficient cells showed slight increase of homologous recombination (HR, which is another major DSBR repair pathways in mammalian cells). More importantly, we found that PAXX contributes to base excision repair pathway via interaction of polymerase beta (pol β). Temozolomide (TMZ) is one of the standard chemotherapies widely applied in glioblastoma. However, TMZ resistance and lack of potent chemotherapy agents can substitute TMZ. We observed that PAXX deficiency cause more sensitivity to TMZ-resistant glioma cells. In conclusion, the PAXX contributes to a variety of DNA repair pathways and TMZ resistance. Therefore, inhibition of PAXX may provide a promising way to overcome TMZ resistance and improve TMZ therapeutic effects in glioma treatment.
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13
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Xu J, Huang H, Peng R, Ding X, Jiang B, Yuan X, Xi J. MicroRNA-30a increases the chemosensitivity of U251 glioblastoma cells to temozolomide by directly targeting beclin 1 and inhibiting autophagy. Exp Ther Med 2018; 15:4798-4804. [PMID: 29805498 PMCID: PMC5952084 DOI: 10.3892/etm.2018.6007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 09/22/2016] [Indexed: 12/12/2022] Open
Abstract
Temozolomide (TMZ) is one of the most commonly used drugs for the clinical treatment of glioblastomas. However, it has been reported that treatment with TMZ can induce autophagy, which leads to tumor resistance and increases the survival of tumor cells. MicroRNA-30a (miR-30a) has been found to have inhibitory effects on autophagy by directly targeting beclin 1. However, the exact role of miR-30a in TMZ-treated glioblastoma cells has not been studied previously. The present study aimed to investigate whether miR-30a increased the cytotoxicity of TMZ to glioblastoma U251 cells, as well as the underlying mechanism. MTT and flow cytometry assay results showed that treatment with TMZ inhibited the proliferation of U251 cells while inducing cell apoptosis in a dose-dependent manner. Western blotting data showed that the expression levels of LC3-II and beclin 1 as well as the ratio of LC3-II to LC3-I were markedly increased in TMZ-treated U251 cells compared with the untreated control cells, indicating that treatment with TMZ induced autophagy. Moreover, reverse transcription-quantitative polymerase chain reaction data showed that treatment with TMZ led to a significant reduction in miR-30a levels in a dose-dependent manner in U251 cells. Elevation of the miR-30a level significantly inhibited TMZ-induced autophagy, demonstrated by the decreased LC3-II and beclin 1 levels and ratio of LC3-II to LC3-I, accompanied by the reduced proliferation and increased apoptosis in TMZ-treated U251 cells. Furthermore, luciferase reporter assay data indicated that beclin 1 was a direct target of miR-30a in U251 cells. In summary, this study demonstrated that miR-30a increases the chemosensitivity of glioblastoma U251 cells to temozolomide by directly targeting beclin 1 and inhibiting autophagy. Therefore, autophagy may be a promising target for the treatment of TMZ-resistant tumors.
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Affiliation(s)
- Jing Xu
- Department of Otolaryngology-Head and Neck Surgery, Xiangya Hospital of Central South University, Changsha, Hunan 410008, P.R. China.,The Institute of Skull Base Surgery and Neurooncology at Hunan, Changsha, Hunan 410008, P.R. China
| | - He Huang
- The Neurosurgical Institute of Central South University, Changsha, Hunan 410008, P.R. China.,Department of Neurosurgery, Xiangya Hospital of Central South University, Changsha, Hunan 410008, P.R. China
| | - Renjun Peng
- The Neurosurgical Institute of Central South University, Changsha, Hunan 410008, P.R. China.,Department of Neurosurgery, Xiangya Hospital of Central South University, Changsha, Hunan 410008, P.R. China
| | - Xiping Ding
- The Neurosurgical Institute of Central South University, Changsha, Hunan 410008, P.R. China.,Department of Neurosurgery, Xiangya Hospital of Central South University, Changsha, Hunan 410008, P.R. China
| | - Bing Jiang
- The Neurosurgical Institute of Central South University, Changsha, Hunan 410008, P.R. China.,Department of Neurosurgery, Xiangya Hospital of Central South University, Changsha, Hunan 410008, P.R. China
| | - Xianrui Yuan
- The Neurosurgical Institute of Central South University, Changsha, Hunan 410008, P.R. China.,Department of Neurosurgery, Xiangya Hospital of Central South University, Changsha, Hunan 410008, P.R. China
| | - Jian Xi
- The Neurosurgical Institute of Central South University, Changsha, Hunan 410008, P.R. China.,Department of Neurosurgery, Xiangya Hospital of Central South University, Changsha, Hunan 410008, P.R. China
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14
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Misiak M, Heldt M, Szeligowska M, Mazzini S, Scaglioni L, Grabe GJ, Serocki M, Lica J, Switalska M, Wietrzyk J, Beretta GL, Perego P, Zietkowski D, Baginski M, Borowski E, Skladanowski A. Molecular basis for the DNA damage induction and anticancer activity of asymmetrically substituted anthrapyridazone PDZ-7. Oncotarget 2017; 8:105137-105154. [PMID: 29285240 PMCID: PMC5739627 DOI: 10.18632/oncotarget.21806] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 09/23/2017] [Indexed: 12/11/2022] Open
Abstract
Anthrapyridazones, imino analogues of anthraquinone, constitute a family of compounds with remarkable anti-cancer activity. To date, over 20 derivatives were studied, of which most displayed nanomolar cytotoxicity towards broad spectrum of cancer cells, including breast, prostate and leukemic ones. BS-154, the most potent derivative, had IC50 values close to 1 nM, however, it was toxic in animal studies. Here, we characterize another anthrapyridazone, PDZ-7, which retains high cytotoxicity while being well tolerated in mice. PDZ-7 is also active in vivo against anthracycline-resistant tumor in a mouse xenograft model and induces DNA damage in proliferating cells, preferentially targeting cells in S and G2 phases of the cell cycle. Activation of Mre11-Rad50-Nbs1 (MRN) complex and phosphorylation of H2AX suggest double-stranded DNA breaks as a major consequence of PDZ-7 treatment. Consistent with this, PDZ-7 treatment blocked DNA synthesis and resulted in cell cycle arrest in late S and G2 phases. Analysis of topoisomerase IIα activity and isolation of the stabilized covalent topoisomerase IIα - DNA complex in the presence of PDZ-7 suggests that this compound is a topoisomerase IIα poison. Moreover, PDZ-7 interfered with actin polymerization, thereby implying its action as a dual inhibitor of processes critical for dividing cells. Using nuclear magnetic resonance (NMR) spectroscopy we show that PDZ-7 interacts with DNA double helix and quadruplex DNA structure. Taken together, our results suggest that PDZ-7 is a unique compound targeting actin cytoskeleton and DNA.
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Affiliation(s)
- Majus Misiak
- Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry, Gdansk University of Technology, Gdansk, Poland
| | - Mateusz Heldt
- Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry, Gdansk University of Technology, Gdansk, Poland
| | - Marlena Szeligowska
- Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry, Gdansk University of Technology, Gdansk, Poland
| | - Stefania Mazzini
- Department of Food, Environmental and Nutritional Sciences, Division of Chemistry and Molecular Biology, University of Milan, Milan, Italy
| | - Leonardo Scaglioni
- Department of Food, Environmental and Nutritional Sciences, Division of Chemistry and Molecular Biology, University of Milan, Milan, Italy
| | - Grzegorz J Grabe
- Department of Medicine, Faculty of Medicine, Imperial College London, London, UK
| | - Marcin Serocki
- Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry, Gdansk University of Technology, Gdansk, Poland
| | - Jan Lica
- Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry, Gdansk University of Technology, Gdansk, Poland
| | - Marta Switalska
- Department of Experimental Oncology, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wroclaw, Poland
| | - Joanna Wietrzyk
- Department of Experimental Oncology, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wroclaw, Poland
| | - Giovanni L Beretta
- Molecular Pharmacology Unit, Department of Experimental Oncology and Molecular Medicine, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Paola Perego
- Molecular Pharmacology Unit, Department of Experimental Oncology and Molecular Medicine, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | | | - Maciej Baginski
- Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry, Gdansk University of Technology, Gdansk, Poland
| | - Edward Borowski
- Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry, Gdansk University of Technology, Gdansk, Poland.,BS-154 sp. z o.o., Gdansk, Poland
| | - Andrzej Skladanowski
- Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry, Gdansk University of Technology, Gdansk, Poland
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15
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Nakagawa Y, Kajihara A, Takahashi A, Murata AS, Matsubayashi M, Ito SS, Ota I, Nakagawa T, Hasegawa M, Kirita T, Ohnishi T, Mori E. BRCA2 protects mammalian cells from heat shock. Int J Hyperthermia 2017; 34:795-801. [PMID: 28891354 DOI: 10.1080/02656736.2017.1370558] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
PURPOSE Heat shock induces DNA double-strand breaks (DSBs) in mammalian cells. Mammalian cells are capable of repairing DSBs by utilising the homologous recombination (HR) pathway. Breast cancer susceptibility gene 2 (BRCA2) is known to regulate the HR pathway. Here, we investigate the role of BRCA2 in repairing DNA damage induced by heat shock. MATERIALS AND METHODS Chinese hamster lung fibroblast cell lines and human tongue squamous cell carcinoma SAS cells were used. RAD51 foci formation assay was used as an HR indicator. Heat sensitivity was analysed with colony forming assays. Phosphorylated histone H2AX (γH2AX) intensity, which correlates with the number of DSBs, was analysed with flow cytometry. RESULTS RAD51 foci appeared with heat shock, and the number of cells with RAD51 foci was maximal at about 4 h after heat shock. Heat-induced RAD51 foci co-localised with γH2AX foci. BRCA2-deficient cells were sensitive to heat when compared to their parental wild-type cells. Heat-induced γH2AX was higher in BRCA2-deficient cells compared to parental cells. In SAS cells, cells transfected with BRCA2-siRNA were more sensitive to heat than cells transfected with negative control siRNA. Apoptotic bodies increased in number more rapidly in BRCA2-siRNA transfected cells than in cells transfected with negative control siRNA when cells were observed at 48 h after a heat treatment. In addition, cells deficient in BRCA2 were incapable of activating heat-induced G2/M arrest. CONCLUSION BRCA2 has a protecting role against heat-induced cell death. BRCA2 might be a potential molecular target for hyperthermic cancer therapy.
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Affiliation(s)
- Yosuke Nakagawa
- a Department of Oral and Maxillofacial Surgery , Nara Medical University , Nara , Japan
| | - Atsuhisa Kajihara
- a Department of Oral and Maxillofacial Surgery , Nara Medical University , Nara , Japan
| | | | - Akiho S Murata
- c Department of Future Basic Medicine , Nara Medical University , Nara , Japan
| | - Masaya Matsubayashi
- c Department of Future Basic Medicine , Nara Medical University , Nara , Japan
| | - Soichiro S Ito
- a Department of Oral and Maxillofacial Surgery , Nara Medical University , Nara , Japan
| | - Ichiro Ota
- d Department of Otolaryngology - Head and Neck Surgery , Nara Medical University , Nara , Japan
| | - Takahiko Nakagawa
- c Department of Future Basic Medicine , Nara Medical University , Nara , Japan
| | - Masatoshi Hasegawa
- e Department of Radiation Oncology , Nara Medical University , Nara , Japan
| | - Tadaaki Kirita
- a Department of Oral and Maxillofacial Surgery , Nara Medical University , Nara , Japan
| | - Takeo Ohnishi
- e Department of Radiation Oncology , Nara Medical University , Nara , Japan
| | - Eiichiro Mori
- c Department of Future Basic Medicine , Nara Medical University , Nara , Japan
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16
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Nikolova T, Kiweler N, Krämer OH. Interstrand Crosslink Repair as a Target for HDAC Inhibition. Trends Pharmacol Sci 2017; 38:822-836. [PMID: 28687272 DOI: 10.1016/j.tips.2017.05.009] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Revised: 05/29/2017] [Accepted: 05/31/2017] [Indexed: 12/29/2022]
Abstract
DNA interstrand crosslinks (ICLs) covalently connect complementary DNA strands. Consequently, DNA replication and transcription are hampered, DNA damage responses (DDR) are initiated, and cell death is triggered. Therefore, drugs inducing ICLs are effective against rapidly growing cancer cells. However, tumors engage a complicated enzymatic machinery to repair and survive ICLs. Several factors, including the post-translational acetylation/deacetylation of lysine residues within proteins, control this network. Histone deacetylases (HDACs) modulate the expression and functions of DNA repair proteins which remove ICLs and control the accessibility of chromatin. Accordingly, histone deacetylase inhibitors (HDACi) are small, pharmacologically and clinically relevant molecules that sensitize cancer cells to ICL inducers. We discuss the mechanism of ICL repair and targets of HDACi within this pathway.
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Affiliation(s)
- Teodora Nikolova
- Institute of Toxicology, University Medical Center, Obere Zahlbacher Strasse 67, 55131 Mainz, Germany.
| | - Nicole Kiweler
- Institute of Toxicology, University Medical Center, Obere Zahlbacher Strasse 67, 55131 Mainz, Germany
| | - Oliver H Krämer
- Institute of Toxicology, University Medical Center, Obere Zahlbacher Strasse 67, 55131 Mainz, Germany.
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17
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Wang K, Kievit FM, Erickson AE, Silber JR, Ellenbogen RG, Zhang M. Culture on 3D Chitosan-Hyaluronic Acid Scaffolds Enhances Stem Cell Marker Expression and Drug Resistance in Human Glioblastoma Cancer Stem Cells. Adv Healthc Mater 2016; 5:3173-3181. [PMID: 27805789 PMCID: PMC5253135 DOI: 10.1002/adhm.201600684] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 09/04/2016] [Indexed: 12/20/2022]
Abstract
The lack of in vitro models that support the growth of glioblastoma (GBM) stem cells (GSCs) that underlie clinical aggressiveness hinders developing new, effective therapies for GBM. While orthotopic patient-derived xenograft models of GBM best reflect in vivo tumor behavior, establishing xenografts is a time consuming, costly, and frequently unsuccessful endeavor. To address these limitations, a 3D porous scaffold composed of chitosan and hyaluronic acid (CHA) is synthesized. Growth and expression of the cancer stem cell (CSC) phenotype of the GSC GBM6 taken directly from fresh xenogratfs grown on scaffolds or as adherent monolayers is compared. While 2D adherent cultures grow as monolayers of flat epitheliod cells, GBM6 cells proliferate within pores of CHA scaffolds as clusters of self-adherent ovoid cells. Growth on scaffolds is accompanied by greater expression of genes that mediate epithelial-mesenchymal transition and maintain a primitive, undifferentiated phenotype, hallmarks of CSCs. Scaffold-grown cells also display higher expression of genes that promote resistance to hypoxia-induced oxidative stress. In accord, scaffold-grown cells show markedly greater resistance to clinically utilized alkylating agents compared to adherent cells. These findings suggest that our CHA scaffolds better mimic in vivo biological and clinical behavior and provide insights for developing novel individualized treatments.
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Affiliation(s)
- Kui Wang
- Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195, USA
| | - Forrest M Kievit
- Department of Neurological Surgery, University of Washington, Seattle, WA, 98195, USA
| | - Ariane E Erickson
- Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195, USA
| | - John R Silber
- Department of Neurological Surgery, University of Washington, Seattle, WA, 98195, USA
| | - Richard G Ellenbogen
- Department of Neurological Surgery, University of Washington, Seattle, WA, 98195, USA
| | - Miqin Zhang
- Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195, USA
- Department of Neurological Surgery, University of Washington, Seattle, WA, 98195, USA
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18
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Berte N, Piée-Staffa A, Piecha N, Wang M, Borgmann K, Kaina B, Nikolova T. Targeting Homologous Recombination by Pharmacological Inhibitors Enhances the Killing Response of Glioblastoma Cells Treated with Alkylating Drugs. Mol Cancer Ther 2016; 15:2665-2678. [PMID: 27474153 DOI: 10.1158/1535-7163.mct-16-0176] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Accepted: 07/15/2016] [Indexed: 11/16/2022]
Abstract
Malignant gliomas exhibit a high level of intrinsic and acquired drug resistance and have a dismal prognosis. First- and second-line therapeutics for glioblastomas are alkylating agents, including the chloroethylating nitrosoureas (CNU) lomustine, nimustine, fotemustine, and carmustine. These agents target the tumor DNA, forming O6-chloroethylguanine adducts and secondary DNA interstrand cross-links (ICL). These cross-links are supposed to be converted into DNA double-strand breaks, which trigger cell death pathways. Here, we show that lomustine (CCNU) with moderately toxic doses induces ICLs in glioblastoma cells, inhibits DNA replication fork movement, and provokes the formation of DSBs and chromosomal aberrations. Since homologous recombination (HR) is involved in the repair of DSBs formed in response to CNUs, we elucidated whether pharmacologic inhibitors of HR might have impact on these endpoints and enhance the killing effect. We show that the Rad51 inhibitors RI-1 and B02 greatly ameliorate DSBs, chromosomal changes, and the level of apoptosis and necrosis. We also show that an inhibitor of MRE11, mirin, which blocks the formation of the MRN complex and thus the recognition of DSBs, has a sensitizing effect on these endpoints as well. In a glioma xenograft model, the Rad51 inhibitor RI-1 clearly enhanced the effect of CCNU on tumor growth. The data suggest that pharmacologic inhibition of HR, for example by RI-1, is a reasonable strategy for enhancing the anticancer effect of CNUs. Mol Cancer Ther; 15(11); 2665-78. ©2016 AACR.
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Affiliation(s)
- Nancy Berte
- Institute of Toxicology, University Medical Center Mainz, Mainz, Germany
| | - Andrea Piée-Staffa
- Institute of Toxicology, University Medical Center Mainz, Mainz, Germany
| | - Nadine Piecha
- Institute of Toxicology, University Medical Center Mainz, Mainz, Germany
| | - Mengwan Wang
- Institute of Toxicology, University Medical Center Mainz, Mainz, Germany
| | - Kerstin Borgmann
- Laboratory of Radiobiology & Experimental Radiooncology, Center of Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Bernd Kaina
- Institute of Toxicology, University Medical Center Mainz, Mainz, Germany.
| | - Teodora Nikolova
- Institute of Toxicology, University Medical Center Mainz, Mainz, Germany.
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Erasimus H, Gobin M, Niclou S, Van Dyck E. DNA repair mechanisms and their clinical impact in glioblastoma. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2016; 769:19-35. [PMID: 27543314 DOI: 10.1016/j.mrrev.2016.05.005] [Citation(s) in RCA: 116] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Accepted: 05/04/2016] [Indexed: 12/18/2022]
Abstract
Despite surgical resection and genotoxic treatment with ionizing radiation and the DNA alkylating agent temozolomide, glioblastoma remains one of the most lethal cancers, due in great part to the action of DNA repair mechanisms that drive resistance and tumor relapse. Understanding the molecular details of these mechanisms and identifying potential pharmacological targets have emerged as vital tasks to improve treatment. In this review, we introduce the various cellular systems and animal models that are used in studies of DNA repair in glioblastoma. We summarize recent progress in our knowledge of the pathways and factors involved in the removal of DNA lesions induced by ionizing radiation and temozolomide. We introduce the therapeutic strategies relying on DNA repair inhibitors that are currently being tested in vitro or in clinical trials, and present the challenges raised by drug delivery across the blood brain barrier as well as new opportunities in this field. Finally, we review the genetic and epigenetic alterations that help shape the DNA repair makeup of glioblastoma cells, and discuss their potential therapeutic impact and implications for personalized therapy.
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Affiliation(s)
- Hélène Erasimus
- NORLUX Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health (LIH), 84 Val Fleuri, L-1526 Luxembourg, Luxembourg
| | - Matthieu Gobin
- NORLUX Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health (LIH), 84 Val Fleuri, L-1526 Luxembourg, Luxembourg
| | - Simone Niclou
- NORLUX Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health (LIH), 84 Val Fleuri, L-1526 Luxembourg, Luxembourg
| | - Eric Van Dyck
- NORLUX Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health (LIH), 84 Val Fleuri, L-1526 Luxembourg, Luxembourg.
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20
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FANCD2 re-expression is associated with glioma grade and chemical inhibition of the Fanconi Anaemia pathway sensitises gliomas to chemotherapeutic agents. Oncotarget 2015; 5:6414-24. [PMID: 25071006 PMCID: PMC4171640 DOI: 10.18632/oncotarget.2225] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Brain tumours kill more children and adults under 40 than any other cancer. Around half of primary brain tumours are glioblastoma multiforme (GBMs) where treatment remains a significant challenge. GBM survival rates have improved little over the last 40 years, thus highlighting an unmet need for the identification/development of novel therapeutic targets and agents to improve GBM treatment. Using archived and fresh glioma tissue, we show that in contrast to normal brain or benign schwannomas GBMs exhibit re-expression of FANCD2, a key protein of the Fanconi Anaemia (FA) DNA repair pathway, and possess an active FA pathway. Importantly, FANCD2 expression levels are strongly associated with tumour grade, revealing a potential exploitable therapeutic window to allow inhibition of the FA pathway in tumour cells, whilst sparing normal brain tissue. Using several small molecule inhibitors of the FA pathway in combination with isogenic FA-proficient/deficient glioma cell lines as well as primary GBM cultures, we demonstrate that inhibition of the FA pathway sensitises gliomas to the chemotherapeutic agents Temozolomide and Carmustine. Our findings therefore provide a strong rationale for the development of novel and potent inhibitors of the FA pathway to improve the treatment of GBMs, which may ultimately impact on patient outcome.
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Dodgshun AJ, Sexton-Oates A, Saffery R, Sullivan MJ. Biallelic FANCD1/BRCA2 mutations predisposing to glioblastoma multiforme with multiple oncogenic amplifications. Cancer Genet 2015; 209:53-6. [PMID: 26740091 DOI: 10.1016/j.cancergen.2015.11.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Revised: 11/18/2015] [Accepted: 11/20/2015] [Indexed: 12/16/2022]
Abstract
Fanconi anaemia (FA) caused by biallelic mutation in FANCD1/BRCA2 is rare but carries a high risk of early onset cancer. Medulloblastoma is well described in this cohort but reports of other brain tumours are uncommon. The molecular profile of tumours from FA patients is not well reported. A glioblastoma multiforme (GBM) from a 3-year-old patient with FA and confirmed biallelic BRCA2 mutations was submitted for methylation analysis. This revealed strong clustering with the K27 mutation subgroup and copy number analysis showed gains of chromosomes 1q, 4q, part of 7q, part of 8q and 17q with resultant amplifications of MDM4, CDK6, MET, MYC and PPM1D (WIP1). We also describe for the first time the germline mutation in BRCA2 c.8057T > C resulting in p.Leu2686Pro in our patient with confirmed FA. Biallelic BRCA2 mutations have predisposed to an aggressive and universally fatal subtype of childhood GBM in our patient. Copy number alterations and multiple oncogenic amplifications may be secondary to inherent chromosomal instability and this raises the question of what role BRCA2 may play in the development of GBM in children without FA.
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Affiliation(s)
- Andrew J Dodgshun
- Children's Cancer Centre, Royal Children's Hospital, Melbourne, Victoria 3052, Australia; Department of Paediatrics, University of Melbourne, Melbourne, Victoria 3052, Australia.
| | - Alexandra Sexton-Oates
- Murdoch Children's Research Institute, Melbourne, Victoria 3052, Australia; Department of Paediatrics, University of Melbourne, Melbourne, Victoria 3052, Australia
| | - Richard Saffery
- Murdoch Children's Research Institute, Melbourne, Victoria 3052, Australia; Department of Paediatrics, University of Melbourne, Melbourne, Victoria 3052, Australia
| | - Michael J Sullivan
- Children's Cancer Centre, Royal Children's Hospital, Melbourne, Victoria 3052, Australia; Murdoch Children's Research Institute, Melbourne, Victoria 3052, Australia
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22
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Xiong T, Chen X, Wei H, Xiao H. Influence of PJ34 on the genotoxicity induced by melphalan in human multiple myeloma cells. Arch Med Sci 2015; 11:301-6. [PMID: 25995744 PMCID: PMC4424240 DOI: 10.5114/aoms.2014.43164] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Revised: 01/13/2014] [Accepted: 02/03/2014] [Indexed: 01/10/2023] Open
Abstract
INTRODUCTION The aim of this study was to evaluate the potential biological activity of N-(6-oxo-5,6-dihydrophenanthridin-2-yl)-(N,N-dimethylamino)acetamide hydrochloride (PJ34) on the genotoxicity induced by melphalan in human multiple myeloma cells. MATERIAL AND METHODS The inhibitory effects of the drugs on the growth of RPMI8226 cells were determined by Cell Counting Kit-8 (CCK-8) assay. The expression of Fanconi anemia/breast cancer (FA/BRCA) pathway related genes was determined by western blot analysis. Cell cycle phase and apoptosis were analyzed by flow cytometry. Coadministration of PJ34 and melphalan had additional effects on cell cycle distribution and enhanced apoptosis of RPMI8226 cells. PJ34 plus melphalan inhibited cell-cycle progression, as evidenced by the increased proportion of cells in the G2/M phase with the decreasing proportion of cells in the G0/1 and S phases. RESULTS However, no significant synergistic effect of PJ34 and melphalan on cell proliferation was observed. These effects were accompanied by inhibition of the FA/BRCA pathway by downregulation of Fanconi D2 (FANCD2) protein expression. The results showed that treatment with 60 µmol/l of PJ34 previously to melphalan administration increased cell apoptosis. Pretreatment also caused cell cycle arrest. CONCLUSIONS This study suggests that enhancement of melphalan efficacy may be best achieved by the poly(ADP-ribose) polymerase-1 (PARP-1) inhibitor PJ34. The effects of PJ34 are associated with inhibition of the FA/BRCA pathway, increased apoptosis percentage, and G2/M cell cycle arrest. Administration of PJ34 has been shown to protect DNA from damage induced by melphalan. This corroborates the biological activities of PJ34 and points to the need for further studies.
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Affiliation(s)
- Ting Xiong
- Department of Hematology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Xiaoqiong Chen
- Department of Hematology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Heng Wei
- Department of Hematology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Hui Xiao
- Department of Hematology, Zhongnan Hospital of Wuhan University, Wuhan, China
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Xiong T, Wei H, Chen X, Xiao H. PJ34, a poly(ADP-ribose) polymerase (PARP) inhibitor, reverses melphalan-resistance and inhibits repair of DNA double-strand breaks by targeting the FA/BRCA pathway in multidrug resistant multiple myeloma cell line RPMI8226/R. Int J Oncol 2014; 46:223-32. [PMID: 25351371 DOI: 10.3892/ijo.2014.2726] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Accepted: 10/03/2014] [Indexed: 11/06/2022] Open
Abstract
There is still no ideal treatment for multidrug resistant multiple myeloma, looking for drugs which can reverse chemotherapy resistance and enhance curative effects of chemotherapy drugs becomes a problem that needs to be solved urgently. Poly(ADP-ribose) polymerase inhibitors appear to be an important tool for medical therapy of several malignancies. In the present study, we investigated the potential of the PARP-1 inhibitor PJ34, in vitro, to further enhance the efficacy of the traditional chemotherapy drug melphalan in the multidrug-resistant multiple myeloma cell line RPMI8226/R. The effects of different concentrations of PJ34 and melphalan on cell proliferation were determined by the CCK-8 assay. The expressions of FA/BRCA pathway-related factors were detected by western blotting and RT-PCR. The percentage of cell apoptosis was measured with flow cytometry. DNA double-strand break (DSB) repair was quantified by γH2AX immunofluorescence. In addition, DNA damage repair at the level of the individual cell was determined by comet assay. Co-administration of PJ34 and melphalan had synergistic inhibitory effects on the proliferation of RPMI8226/R cells, suggesting more powerful antitumor activities. The apoptosis percentage also was increased more obviously by the treatment of melphalan plus PJ34. The activation of FA/BRCA pathway was inhibited by downregulation of related factors including FANCD2, BRCA2 and Rad51. PJ34 significantly increased the ratio of γH2AX-positive cells and the number of foci/cells. The comet tail rate of cells, tail length, tail moment and Olive tail moment all increased after PJ34 treatment in RPMI8226/R cells. These results indicate that PJ34 combined treatment with melphalan produces synergistic effects and reverses multidrug resistance of RPMI8226/R cells effectively. PJ34 cannot induce DNA damage directly, but it may increase the DNA damage induced by melphalan through inhibiting DNA damage repair. The suppression of FA/BRCA pathway may be the mechanism. Therefore, we suggest that PARP inhibitors may deserve future investigations as tools for medical treatment of multidrug resistant multiple myeloma.
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Affiliation(s)
- Ting Xiong
- Department of Hematology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Heng Wei
- Department of Hematology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Xiaoqiong Chen
- Department of Hematology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Hui Xiao
- Department of Hematology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
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Nakagawa Y, Kajihara A, Takahashi A, Kondo N, Mori E, Kirita T, Ohnishi T. The BRCA2 gene is a potential molecular target during 5-fluorouracil therapy in human oral cancer cells. Oncol Rep 2014; 31:2001-6. [PMID: 24627042 DOI: 10.3892/or.2014.3080] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Accepted: 01/28/2014] [Indexed: 11/05/2022] Open
Abstract
5-Fluorouracil (5-FU) is widely used in clinical cancer therapy. It is commonly used either alone or in combination with other drugs and/or radiation for head and neck, and other types of cancers. 5-FU induces DNA double-strand breaks (DSBs). Inhibition of the repair of 5-FU-induced DSBs may improve the therapeutic response in many tumors to this anticancer agent. The aim of the present study was to further our understanding of the pathways which are involved in the repair of 5-FU-induced DSBs. Cell survival after drug treatment was examined with colony forming assays using Chinese hamster lung fibroblast cells or Chinese hamster ovary cell lines which are deficient in DSB repair pathways involving the homologous recombination repair-related genes BRCA2 and XRCC2, and the non-homologous end joining repair-related genes DNA-PKcs and Ku80. It was found that BRCA2 was involved in such repair, and may be effectively targeted to inhibit the repair of 5-FU-induced damage. Observations showed that knockdown of BRCA2 using small interference RNA suppression increased the sensitivity to 5-FU of human oral cancer cell lines (SAS and HSC3). These findings suggest that downregulation of BRCA2 may be useful for sensitizing tumor cells during 5-FU chemotherapy.
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Affiliation(s)
- Yosuke Nakagawa
- Particle Radiation Oncology Research Center, Research Reactor Institute, Kyoto University, Sennan-gun, Osaka 590-0494, Japan
| | - Atsuhisa Kajihara
- Department of Oral and Maxillofacial Surgery, School of Medicine, Nara Medical University, Kashihara, Nara 634‑8521, Japan
| | - Akihisa Takahashi
- Advanced Scientific Research Leaders Development Unit, Gunma University, Maebashi, Gunma 371‑8511, Japan
| | - Natsuko Kondo
- Particle Radiation Oncology Research Center, Research Reactor Institute, Kyoto University, Sennan-gun, Osaka 590-0494, Japan
| | - Eiichiro Mori
- Department of Radiation Oncology, School of Medicine, Nara Medical University, Kashihara, Nara 634-8521, Japan
| | - Tadaaki Kirita
- Department of Oral and Maxillofacial Surgery, School of Medicine, Nara Medical University, Kashihara, Nara 634‑8521, Japan
| | - Takeo Ohnishi
- Department of Radiation Oncology, School of Medicine, Nara Medical University, Kashihara, Nara 634-8521, Japan
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Goh XY, Newton R, Wernisch L, Fitzgerald R. Testing the utility of an integrated analysis of copy number and transcriptomics datasets for inferring gene regulatory relationships. PLoS One 2013; 8:e63780. [PMID: 23737949 PMCID: PMC3667814 DOI: 10.1371/journal.pone.0063780] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Accepted: 04/07/2013] [Indexed: 12/31/2022] Open
Abstract
Correlation patterns between matched copy number variation and gene expression data in cancer samples enable the inference of causal gene regulatory relationships by exploiting the natural randomization of such systems. The aim of this study was to test and verify experimentally the accuracy of a causal inference approach based on genomic randomization using esophageal cancer samples. Two candidates with strong regulatory effects emerging from our analysis are components of growth factor receptors, and implicated in cancer development, namely ERBB2 and FGFR2. We tested experimentally two ERBB2 and three FGFR2 regulated interactions predicted by the statistical analysis, all of which were confirmed. We also applied the method in a meta-analysis of 10 cancer datasets and tested 15 of the predicted regulatory interactions experimentally. Three additional predicted ERBB2 regulated interactions were confirmed, as well as interactions regulated by ARPC1A and FANCG. Overall, two thirds of experimentally tested predictions were confirmed.
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Affiliation(s)
- Xin Yi Goh
- Medical Research Council Cancer Cell Unit, Hutchison-MRC Research Centre, Cambridge, United Kingdom
- Department of Oncology, University of Cambridge, Cambridge, United Kingdom
| | - Richard Newton
- Medical Research Council Biostatistics Unit, Cambridge, United Kingdom
- * E-mail:
| | - Lorenz Wernisch
- Medical Research Council Biostatistics Unit, Cambridge, United Kingdom
| | - Rebecca Fitzgerald
- Medical Research Council Cancer Cell Unit, Hutchison-MRC Research Centre, Cambridge, United Kingdom
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Yoshimoto K, Mizoguchi M, Hata N, Murata H, Hatae R, Amano T, Nakamizo A, Sasaki T. Complex DNA repair pathways as possible therapeutic targets to overcome temozolomide resistance in glioblastoma. Front Oncol 2012; 2:186. [PMID: 23227453 PMCID: PMC3514620 DOI: 10.3389/fonc.2012.00186] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Accepted: 11/16/2012] [Indexed: 12/31/2022] Open
Abstract
Many conventional chemotherapeutic drugs exert their cytotoxic function by inducing DNA damage in the tumor cell. Therefore, a cell-inherent DNA repair pathway, which reverses the DNA-damaging effect of the cytotoxic drugs, can mediate therapeutic resistance to chemotherapy. The monofunctional DNA-alkylating agent temozolomide (TMZ) is a commonly used chemotherapeutic drug and the gold standard treatment for glioblastoma (GBM). Although the activity of DNA repair protein O6-methylguanine-DNA methyltransferase (MGMT) has been described as the main modulator to determine the sensitivity of GBM to TMZ, a subset of GBM does not respond despite MGMT inactivation, suggesting that another DNA repair mechanism may also modulate the tolerance to TMZ. Considerable interest has focused on MGMT, mismatch repair (MMR), and the base excision repair (BER) pathway in the mechanism of mediating TMZ resistance, but emerging roles for the DNA strand-break repair pathway have been demonstrated. In the first part of this review article, we briefly review the significant role of MGMT, MMR, and the BER pathway in the tolerance to TMZ; in the last part, we review the recent publications that demonstrate possible roles of DNA strand-break repair pathways, such as single-strand break repair and double-strand break repair, as well as the Fanconi anemia pathway in the repair process after alkylating agent-based therapy. It is possible that all of these repair pathways have a potential to modulate the sensitivity to TMZ and aid in overcoming the therapeutic resistance in the clinic.
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Affiliation(s)
- Koji Yoshimoto
- Department of Neurosurgery, Graduate School of Medical Sciences, Kyushu University Fukuoka, Japan
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Disrupted Signaling through the Fanconi Anemia Pathway Leads to Dysfunctional Hematopoietic Stem Cell Biology: Underlying Mechanisms and Potential Therapeutic Strategies. Anemia 2012; 2012:265790. [PMID: 22675615 PMCID: PMC3366203 DOI: 10.1155/2012/265790] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Accepted: 03/13/2012] [Indexed: 12/31/2022] Open
Abstract
Fanconi anemia (FA) is the most common inherited bone marrow failure syndrome. FA patients suffer to varying degrees from a heterogeneous range of developmental defects and, in addition, have an increased likelihood of developing cancer. Almost all FA patients develop a severe, progressive bone marrow failure syndrome, which impacts upon the production of all hematopoietic lineages and, hence, is thought to be driven by a defect at the level of the hematopoietic stem cell (HSC). This hypothesis would also correlate with the very high incidence of MDS and AML that is observed in FA patients. In this paper, we discuss the evidence that supports the role of dysfunctional HSC biology in driving the etiology of the disease. Furthermore, we consider the different model systems currently available to study the biology of cells defective in the FA signaling pathway and how they are informative in terms of identifying the physiologic mediators of HSC depletion and dissecting their putative mechanism of action. Finally, we ask whether the insights gained using such disease models can be translated into potential novel therapeutic strategies for the treatment of the hematologic disorders in FA patients.
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The chloroethylating anticancer drug ACNU induces FRA1 that is involved in drug resistance of glioma cells. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2012; 1823:1199-207. [PMID: 22609303 DOI: 10.1016/j.bbamcr.2012.05.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Revised: 04/11/2012] [Accepted: 05/08/2012] [Indexed: 12/31/2022]
Abstract
FRA1 belongs, together with c-Fos and FosB, to the family of Fos proteins that form with members of the ATF and Jun family the transcription factor AP-1 (activator protein 1). Previously we showed that c-Fos protects mouse embryonic fibroblasts against the cytotoxic effects of ultraviolet (UV) light by induction of the endonuclease XPF, leading to enhanced nucleotide excision repair (NER) activity. Here, we analyzed the regulation of FRA1 in glioma cells treated with the anticancer drug nimustine (ACNU) and its role in ACNU-induced toxicity. We show that FRA1 is upregulated in glioblastoma cells following ACNU on mRNA and protein levels. Knockdown of FRA1 by either siRNA or shRNA clearly sensitized glioma cells towards ACNU-induced cell death. Despite decreased AP-1 binding activity upon FRA1 knockdown, this effect is independent on regulation of the AP-1 target genes fasL, ercc1 and xpf. In addition, FRA1 knockdown does not affect DNA repair capacity. However, lack of FRA1 attenuated the ACNU-induced phosphorylation of CHK1 and led to a reduced arrest of cells in G2/M and, thereby, presumably leads to enhanced cell death in the subsequent cell cycle.
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Singh KK, Shukla PC, Quan A, Desjardins JF, Lovren F, Pan Y, Garg V, Gosal S, Garg A, Szmitko PE, Schneider MD, Parker TG, Stanford WL, Leong-Poi H, Teoh H, Al-Omran M, Verma S. BRCA2 protein deficiency exaggerates doxorubicin-induced cardiomyocyte apoptosis and cardiac failure. J Biol Chem 2011; 287:6604-14. [PMID: 22157755 DOI: 10.1074/jbc.m111.292664] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The tumor suppressor breast cancer susceptibility gene 2 (BRCA2) plays an important role in the repair of DNA damage, and loss of BRCA2 predisposes carriers to breast and ovarian cancers. Doxorubicin (DOX) remains the cornerstone of chemotherapy in such individuals. However, it is often associated with cardiac failure, which once manifests carries a poor prognosis. Because BRCA2 regulates genome-wide stability and facilitates DNA damage repair, we hypothesized that loss of BRCA2 may increase susceptibility to DOX-induced cardiac failure. To this aim, we generated cardiomyocyte-specific BRCA2 knock-out (CM-BRCA2(-/-)) mice using the Cre-loxP technology and evaluated their basal and post-DOX treatment phenotypes. Although CM-BRCA2(-/-) mice exhibited no basal cardiac phenotype, DOX treatment resulted in markedly greater cardiac dysfunction and mortality in CM-BRCA2(-/-) mice compared with control mice. Apoptosis in left ventricular (LV) sections from CM-BRCA2(-/-) mice compared with that in corresponding sections from wild-type (WT) littermate controls was also significantly enhanced after DOX treatment. Microscopic examination of LV sections from DOX-treated CM-BRCA2(-/-) mice revealed a greater number of DNA double-stranded breaks and the absence of RAD51 focus formation, an essential marker of double-stranded break repair. The levels of p53 and the p53-related proapoptotic proteins p53-up-regulated modulator of apoptosis (PUMA) and Bax were significantly increased in samples from CM-BRCA2(-/-) mice. This corresponded with increased Bax to Bcl-2 ratios and elevated cytochrome c release in the LV sections of DOX-treated CM-BRCA2(-/-) mice. Taken together, these data suggest a critical and previously unrecognized role of BRCA2 as a gatekeeper of DOX-induced cardiomyocyte apoptosis and susceptibility to overt cardiac failure. Pharmacogenomic studies evaluating cardiac function in BRCA2 mutation carriers treated with doxorubicin are encouraged.
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Affiliation(s)
- Krishna K Singh
- Division of Cardiac Surgery, The Keenan Research Centre in the Li Ka Shing Knowledge Institute of St.Michael’s Hospital,Toronto, Ontario M5B 1W8, Canada
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