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Xu D, Yao J, Zhang Y, Xiao N, Peng P, Li Z, Pan Z, Yao Z. The Effect of PEI-Mediated E1A on the Radiosensitivity of Hepatic Carcinoma Cells. Asian Pac J Cancer Prev 2020; 21:911-917. [PMID: 32334450 PMCID: PMC7445989 DOI: 10.31557/apjcp.2020.21.4.911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Indexed: 11/26/2022] Open
Abstract
Objective: The study was undertaken to investigate the effects of polyethyleneimine (PEI)-mediated adenovirus 5 early region 1A (E1A) on radiosensitivity of human hepatic carcinoma cell in vitro and to disclosure the underlying mechanism. Materials and Methods: Human hepatic carcinoma SMMC-7721 cell line was transfected with E1A gene using PEI vector. Untransfected cells (SMMC-7721 group), cells transfected with blank-vector (SMMC-7721-vect group), and cells transfected with E1A gene (SMMC-7721-E1A group) were treated with 6 MV X-ray irradiation at doses of 0, 1, 2, 4, 8 and Gy, respectively. Radiosensitivity was determined by MTT assay and quantified by calculating the cell survival rate. Cell-cycle distribution and apotosis rate were monitored by flow cytometry. Results: The survival rate of SMMC-7721-E1A was significantly lower than that of SMMC-7721 cell. Apoptosis rate of SMMC-7721-E1A group was significantly higher than that of SMMC-7721group (P<0.01).The ratio of S stage in cell cycle of SMMC-7721-E1A was significantly lower than that in SMMC-7721 cell. The ratio of G2/M stage in cell cycle of SMMC-7721-E1A was significantly higher than that in SMMC-7721 cell (P<0.01). Conclusion: PEI could transfect E1A gene into hepatic carcinoma cells PEI-mediated E1A could effectively enhance radiosensitivity of hepatic carcinoma cells which may be related to its effects on apoptosis promoting leading to S phase suppression and G2/M phase arrest.
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Affiliation(s)
- Danghui Xu
- Department of Radiology,Affiliated Hospital of Nanjing University of Chinese Medicine,Jiangsu Provincial Hospital of Traditional Chinese Medicine,Nanjing, Jiangsu Province ,China
| | - Jianxin Yao
- Department of Medical Imaging, Nanjing Vocational Health College, Nanjing, Jiangsu Province, China
| | - Yiwen Zhang
- Department of Nursing, The Affiliated Children's Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Nan Xiao
- Department of Medical Imaging, Nanjing Vocational Health College, Nanjing, Jiangsu Province, China
| | - Peng Peng
- Department of Nursing, Nanjing Health College of Jiangsu Union Technical Institute, Nanjing, Jiangsu Province, China
| | - Zhanfeng Li
- Department of Medical Imaging, Nanjing Vocational Health College, Nanjing, Jiangsu Province, China
| | - Zhiyao Pan
- Department of Basic Medical Science, Zhejiang University Medical College, Hangzhou, Zhejiang Province, China
| | - Zhifeng Yao
- Department of Oncology, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu Province, China.,Department of Radiotherapy, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
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Sharma RA, Plummer R, Stock JK, Greenhalgh TA, Ataman O, Kelly S, Clay R, Adams RA, Baird RD, Billingham L, Brown SR, Buckland S, Bulbeck H, Chalmers AJ, Clack G, Cranston AN, Damstrup L, Ferraldeschi R, Forster MD, Golec J, Hagan RM, Hall E, Hanauske AR, Harrington KJ, Haswell T, Hawkins MA, Illidge T, Jones H, Kennedy AS, McDonald F, Melcher T, O'Connor JPB, Pollard JR, Saunders MP, Sebag-Montefiore D, Smitt M, Staffurth J, Stratford IJ, Wedge SR. Clinical development of new drug-radiotherapy combinations. Nat Rev Clin Oncol 2016; 13:627-42. [PMID: 27245279 DOI: 10.1038/nrclinonc.2016.79] [Citation(s) in RCA: 213] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In countries with the best cancer outcomes, approximately 60% of patients receive radiotherapy as part of their treatment, which is one of the most cost-effective cancer treatments. Notably, around 40% of cancer cures include the use of radiotherapy, either as a single modality or combined with other treatments. Radiotherapy can provide enormous benefit to patients with cancer. In the past decade, significant technical advances, such as image-guided radiotherapy, intensity-modulated radiotherapy, stereotactic radiotherapy, and proton therapy enable higher doses of radiotherapy to be delivered to the tumour with significantly lower doses to normal surrounding tissues. However, apart from the combination of traditional cytotoxic chemotherapy with radiotherapy, little progress has been made in identifying and defining optimal targeted therapy and radiotherapy combinations to improve the efficacy of cancer treatment. The National Cancer Research Institute Clinical and Translational Radiotherapy Research Working Group (CTRad) formed a Joint Working Group with representatives from academia, industry, patient groups and regulatory bodies to address this lack of progress and to publish recommendations for future clinical research. Herein, we highlight the Working Group's consensus recommendations to increase the number of novel drugs being successfully registered in combination with radiotherapy to improve clinical outcomes for patients with cancer.
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Affiliation(s)
- Ricky A Sharma
- UCL Cancer Institute, University College London, 72 Huntley Street, London WC1E 6DD, UK
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Martin D Forster
- UCL Cancer Institute, University College London, 72 Huntley Street, London WC1E 6DD, UK
| | - Julian Golec
- Vertex Pharmaceuticals (Europe) Ltd, Abingdon, UK
| | | | - Emma Hall
- The Institute of Cancer Research/The Royal Marsden NIHR Biomedical Research Centre, London, UK
| | | | - Kevin J Harrington
- The Institute of Cancer Research/The Royal Marsden NIHR Biomedical Research Centre, London, UK
| | | | | | | | | | | | - Fiona McDonald
- The Institute of Cancer Research/The Royal Marsden NIHR Biomedical Research Centre, London, UK
| | | | | | | | | | | | | | - John Staffurth
- Cardiff University and Velindre Cancer Centre, Cardiff, UK
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3
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Zhang F, Yu T, Yi CL, Sun XF. Radiation-inducible HtrA2 gene enhances radiosensitivity of uveal melanoma OCM-1 cellsin vitroandin vivo. Clin Exp Ophthalmol 2014; 42:761-8. [PMID: 24606398 DOI: 10.1111/ceo.12314] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Accepted: 02/26/2014] [Indexed: 12/25/2022]
Affiliation(s)
- Fan Zhang
- Department of Orthopedics; Tongji Hospital; Tongji Medical College; Huazhong University of Science and Technology; Wuhan Hubei China
| | - Tian Yu
- Department of Ophthalmology; Tongji Hospital; Tongji Medical College; Huazhong University of Science and Technology; Wuhan Hubei China
| | - Cheng-la Yi
- Department of Traumatic Surgery; Tongji Hospital; Tongji Medical College; Huazhong University of Science and Technology; Wuhan Hubei China
| | - Xu-fang Sun
- Department of Ophthalmology; Tongji Hospital; Tongji Medical College; Huazhong University of Science and Technology; Wuhan Hubei China
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Shepelev MV, Korobko EV, Vinogradova TV, Kopantsev EP, Korobko IV. LY294002 enhances expression of proteins encoded by recombinant replication-defective adenoviruses via mTOR- and non-mTOR-dependent mechanisms. Mol Pharm 2013; 10:931-9. [PMID: 23373904 DOI: 10.1021/mp3003122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Adenovirus-based drugs are efficient when combined with other anticancer treatments. Here we show that treatment with LY294002 and LY303511 upregulates expression of recombinant proteins encoded by replication-defective adenoviruses, including expression of therapeutically valuable combination of herpes simplex virus thymidine kinase controlled by human telomerase reverse transcriptase promoter (Ad-hTERT-HSVtk). In line with this, treatment with LY294002 synergized with Ad-hTERT-HSVtk infection in the presence of gancyclovir prodrug on Calu-I lung cancer cell death. The effect of LY294002 and LY303511 on adenovirus-delivered transgene expression was demonstrated in 4 human lung cancer cell lines. LY294002-induced upregulation of adenovirally delivered transgene is mediated in part by direct inhibition of mTOR protein kinase in mTORC2 signaling complex thus suggesting that anticancer drugs targeting mTOR will also enhance expression of transgenes delivered with adenoviral vectors. As both LY294002 and LY303511 are candidate prototypic anticancer drugs, and many mTOR inhibitors for cancer treatment are under development, our results have important implication for development of future therapeutic strategies with adenoviral gene delivery.
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Affiliation(s)
- Mikhail V Shepelev
- Institute of Gene Biology, Russian Academy of Sciences, 34/5 Vavilov Street, Moscow, 119334, Russia.
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5
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Foulds GA, Radons J, Kreuzer M, Multhoff G, Pockley AG. Influence of tumors on protective anti-tumor immunity and the effects of irradiation. Front Oncol 2013; 3:14. [PMID: 23378947 PMCID: PMC3561630 DOI: 10.3389/fonc.2013.00014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2012] [Accepted: 01/15/2013] [Indexed: 12/20/2022] Open
Abstract
Innate and adaptive immunity plays important roles in the development and progression of cancer and it is becoming apparent that tumors can influence the induction of potentially protective responses in a number of ways. The prevalence of immunoregulatory T cell populations in the circulation and tumors of patients with cancer is increased and the presence of these cells appears to present a major barrier to the induction of tumor immunity. One aspect of tumor-mediated immunoregulation which has received comparatively little attention is that which is directed toward natural killer (NK) cells, although evidence that the phenotype and function of NK cell populations are modified in patients with cancer is accumulating. Although the precise mechanisms underlying these localized and systemic immunoregulatory effects remain unclear, tumor-derived factors appear, in part at least, to be involved. The effects could be manifested by an altered function and/or via an influence on the migratory properties of individual cell subsets. A better insight into endogenous immunoregulatory mechanisms and the capacity of tumors to modify the phenotype and function of innate and adaptive immune cells might assist the development of new immunotherapeutic approaches and improve the management of patients with cancer. This article reviews current knowledge relating to the influence of tumors on protective anti-tumor immunity and considers the potential influence that radiation-induced effects might have on the prevalence, phenotype, and function of innate and adaptive immune cells in patients with cancer.
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Affiliation(s)
- Gemma A Foulds
- Department of Oncology, The Medical School, The University of Sheffield Sheffield, UK ; Department of Radiation Oncology, Klinikum rechts der Isar, Technische Universität München Munich, Germany
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6
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Zhou HB, Yin YF, Hu Y, Li X, Zou LY, Li YJ, Gu Y, Ou BQ, Fu J, Du JH, Wu G. Suppression of vascular endothelial growth factor via siRNA interference modulates the biological behavior of human nasopharyngeal carcinoma cells. Jpn J Radiol 2011; 29:615-22. [PMID: 21956366 DOI: 10.1007/s11604-011-0603-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2010] [Accepted: 04/25/2011] [Indexed: 10/17/2022]
Abstract
PURPOSE The aim was to study the effect of vascular endothelial growth factor (VEGF) down-regulation by small interfering (si)RNA-mediated interference (RNAi) on the biological features of nasopharyngeal carcinoma cell line CNE-2. MATERIALS AND METHODS The combined plasmids pU-siVEGF and pU-siCONT were transfected into CNE-2 cells with lipofectamine. The transfected cells were placed in fresh medium containing G418. Expression of VEGF mRNA and protein were measured by reverse transcriptase-polymerase chain reaction and Western blot, respectively. The transwell chamber model was employed to test the ability of cell invasion in vitro. The distribution of cell cycle phases was determined by flow cytometry. Cell survival was assessed by clonogenic assays. RESULTS Both VEGF mRNA and protein expression were significantly decreased in the pU-siVEGF group compared with controls (P < 0.05). The cell cycle was arrested in the G(1) phase (P < 0.05). A higher apoptotic ratio and lower invasion ability were seen in the pU-siVEGF group. The D(0) (mean lethal dose) and SF(2) values were significantly lower than those in the control group (P < 0.05). CONCLUSION Delivery of siRNA targeting VEGF seems efficient in down-regulating VEGF expression and diminishing the growth, proliferation, and invasiveness of CNE-2 cells. It also enhanced the sensitivity of CNE-2 cells to radiation.
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Affiliation(s)
- Hai B Zhou
- Department of Radiation and Medical Oncology, Second Hospital of Yichang, 4 Tiyuchang Road, Yichang, Hubei 443000, China.
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7
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Zhang Y, Chen LH, Wang L, Wang HM, Zhang YW, Shi YS. Radiation-inducible PTEN expression radiosensitises hepatocellular carcinoma cells. Int J Radiat Biol 2010; 86:964-74. [DOI: 10.3109/09553002.2010.496032] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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8
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Hingorani M, White CL, Zaidi S, Pandha HS, Melcher AA, Bhide SA, Nutting CM, Syrigos KN, Vile RG, Vassaux G, Harrington KJ. Therapeutic effect of sodium iodide symporter gene therapy combined with external beam radiotherapy and targeted drugs that inhibit DNA repair. Mol Ther 2010; 18:1599-605. [PMID: 20588260 DOI: 10.1038/mt.2010.120] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Adenoviral (AdV) transfer of sodium iodide symporter (NIS) gene has translational potential, but relatively low levels of transduction and subsequent radioisotope uptake limit the efficacy of the approach. In previous studies, we showed that combining NIS gene delivery with external beam radiotherapy (EBRT) and DNA damage repair inhibitors increased viral gene expression and radioiodide uptake. Here, we report the therapeutic efficacy of this strategy. An adenovirus expressing NIS from a telomerase promoter (Ad-hTR-NIS) was cytotoxic combined with relatively high-dose (50 microCi) (131)I therapy and enhanced the efficacy of EBRT combined with low-dose (10 and 25 microCi) (131)I therapy in colorectal and head and neck cancer cells. Combining this approach with ataxia-telangiectasia mutated (ATM) or DNA-dependent protein kinase (DNA-PK) inhibition caused maintenance of double-stranded DNA breaks (DSBs) at 24 hours and increased cytotoxicity on clonogenic assay. When the triplet of NIS-mediated (131)I therapy, EBRT, and DNA-PKi was used in vivo, 90% of mice were tumor-free at 5 weeks. Acute radiation toxicity in the EBRT field was not exacerbated. In contrast, DNA-PKi did not enhance the therapeutic efficacy of EBRT plus adenovirus-mediated HSVtk/ganciclovir (GCV). Therefore, combining NIS gene therapy and EBRT represents an ideal strategy to exploit the therapeutic benefits of novel radiosensitizers.
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Affiliation(s)
- Mohan Hingorani
- Targeted Therapy Team, The Institute of Cancer Research, London, UK
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9
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Harrington KJ, Karapanagiotou EM, Roulstone V, Twigger KR, White CL, Vidal L, Beirne D, Prestwich R, Newbold K, Ahmed M, Thway K, Nutting CM, Coffey M, Harris D, Vile RG, Pandha HS, Debono JS, Melcher AA. Two-stage phase I dose-escalation study of intratumoral reovirus type 3 dearing and palliative radiotherapy in patients with advanced cancers. Clin Cancer Res 2010; 16:3067-77. [PMID: 20484020 DOI: 10.1158/1078-0432.ccr-10-0054] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
PURPOSE To determine the safety and feasibility of combining intratumoral reovirus and radiotherapy in patients with advanced cancer and to assess viral biodistribution, reoviral replication in tumors, and antiviral immune responses. EXPERIMENTAL DESIGN Patients with measurable disease amenable to palliative radiotherapy were enrolled. In the first stage, patients received radiotherapy (20 Gy in five fractions) plus two intratumoral injections of RT3D at doses between 1 x 10(8) and 1 x 10(10) TCID(50). In the second stage, the radiotherapy dose was increased (36 Gy in 12 fractions) and patients received two, four, or six doses of RT3D at 1 x 10(10) TCID(50). End points were safety, viral replication, immunogenicity, and antitumoral activity. RESULTS Twenty-three patients with various solid tumors were treated. Dose-limiting toxicity was not seen. The most common toxicities were grade 2 (or lower) pyrexia, influenza-like symptoms, vomiting, asymptomatic lymphopenia, and neutropenia. There was no exacerbation of the acute radiation reaction. Reverse transcription-PCR (RT-PCR) studies of blood, urine, stool, and sputum were negative for viral shedding. In the low-dose (20 Gy in five fractions) radiation group, two of seven evaluable patients had a partial response and five had stable disease. In the high-dose (36 Gy in 12 fractions) radiation group, five of seven evaluable patients had partial response and two stable disease. CONCLUSIONS The combination of intratumoral RT3D and radiotherapy was well tolerated. The favorable toxicity profile and lack of vector shedding means that this combination should be evaluated in newly diagnosed patients receiving radiotherapy with curative intent.
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Affiliation(s)
- Kevin J Harrington
- The Institute of Cancer Research, Chester Beatty Laboratories, London, United Kingdom.
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10
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Hasegawa M, Kurata M, Yamamoto K, Yoshida K, Aizawa S, Kitagawa M. A novel role for acinus and MCM2 as host-specific signaling enhancers of DNA-damage-induced apoptosis in association with viral protein gp70. Leuk Res 2009; 33:1100-7. [DOI: 10.1016/j.leukres.2008.10.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2008] [Revised: 09/22/2008] [Accepted: 10/27/2008] [Indexed: 12/13/2022]
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Silberhumer GR, Zakian K, Malhotra S, Brader P, Gönen M, Koutcher J, Fong Y. Relationship between 31P metabolites and oncolytic viral therapy sensitivity in human colorectal cancer xenografts. Br J Surg 2009; 96:809-16. [DOI: 10.1002/bjs.6604] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Abstract
Background
Studies using phosphorus magnetic resonance spectroscopy (MRS) have pointed to the significance of phospholipid metabolite alterations as biochemical markers for tumour progression or therapy response.
Methods
Spectroscopic imaging was performed in colorectal flank tumours in nude mice. In vivo tumour doubling times for each cell line were measured. In vivo sensitivity of each tumour line to treatment with G207 and NV1020 oncolytic viruses was assessed. Correlations between viral sensitivity and tumour doubling time and phosphorus MRS were estimated.
Results
For G207 virus, in vitro cytotoxicity tests showed cell viability at multiplicities of infection (ratio of viral particles per tumour cell) of 0·1 on day 6 as follows: C85, less than 1 per cent; HCT8, 1 per cent; LS174T, 9 per cent; HT29, 18 per cent; and C18, 92 per cent. Respective values for NV1020 were 1, 18, 4, 18 and 86 per cent. The phosphoethanolamine to phosphocholine ratio was significantly lower in virus-sensitive than -insensitive cells, and was dependent on tumour doubling time.
Conclusion
Alterations in membrane phospholipid metabolites that relate to proliferation of cancer cells affect the efficacy of oncolytic viral therapy. MRS proved a highly sensitive non-invasive tool for predicting the efficacy of viruses.
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Affiliation(s)
- G R Silberhumer
- Department of Surgery, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA
| | - K Zakian
- Department of Radiology, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA
| | - S Malhotra
- Department of Surgery, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA
| | - P Brader
- Department of Surgery, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA
- Department of Radiology, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA
| | - M Gönen
- Department of Epidemiology and Biostatistics, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA
| | - J Koutcher
- Department of Radiology, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA
| | - Y Fong
- Department of Surgery, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA
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12
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Hingorani M, White CL, Merron A, Peerlinck I, Gore ME, Slade A, Scott SD, Nutting CM, Pandha HS, Melcher AA, Vile RG, Vassaux G, Harrington KJ. Inhibition of repair of radiation-induced DNA damage enhances gene expression from replication-defective adenoviral vectors. Cancer Res 2009; 68:9771-8. [PMID: 19047156 DOI: 10.1158/0008-5472.can-08-1911] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Radiation has been shown to up-regulate gene expression from adenoviral vectors in previous studies. In the current study, we show that radiation-induced dsDNA breaks and subsequent signaling through the mitogen-activated protein kinase (MAPK) pathway are responsible, at least in part, for this enhancement of transgene expression both in vitro and in vivo. Inhibitors of ataxia-telangiectasia-mutated, poly(ADP-ribose) polymerase-mutated, and DNA-dependent protein kinase (DNA-PK)-mediated DNA repair were shown to maintain dsDNA breaks (gammaH2AX foci) by fluorescence-activated cell sorting and microscopy. Inhibition of DNA repair was associated with increased green fluorescent protein (GFP) expression from a replication-defective adenoviral vector (Ad-CMV-GFP). Radiation-induced up-regulation of gene expression was abrogated by inhibitors of MAPK (PD980059 and U0126) and phosphatidylinositol 3-kinase (LY294002) but not by p38 MAPK inhibition. A reporter plasmid assay in which GFP was under the transcriptional control of artificial Egr-1 or cytomegalovirus promoters showed that the DNA repair inhibitors increased GFP expression only in the context of the Egr-1 promoter. In vivo administration of a water-soluble DNA-PK inhibitor (KU0060648) was shown to maintain luciferase expression in HCT116 xenografts after intratumoral delivery of Ad-RSV-Luc. These data have important implications for therapeutic strategies involving multimodality use of radiation, targeted drugs, and adenoviral gene delivery and provide a framework for evaluating potential advantageous combinatorial effects.
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Affiliation(s)
- Mohan Hingorani
- Targeted Therapy Team, The Institute of Cancer Research, Queen Mary's School of Medicine and Dentistry, Royal Marsden Hospital, London, United Kingdom
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Hamada N. Recent insights into the biological action of heavy-ion radiation. JOURNAL OF RADIATION RESEARCH 2009; 50:1-9. [PMID: 18838844 DOI: 10.1269/jrr.08070] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Biological effectiveness varies with the linear energy transfer (LET) of ionizing radiation. During cancer therapy or long-term interplanetary manned explorations, humans are exposed to high-LET energetic heavy ions that inactivate cells more effectively than low-LET photons like X-rays and gamma-rays. Recent biological studies have illustrated that heavy ions overcome tumor radioresistance caused by Bcl-2 overexpression, p53 mutations and intratumor hypoxia, and possess antiangiogenic and antimetastatic potential. Compared with heavy ions alone, the combination with chemical agents (a Bcl-2 inhibitor HA14-1, an anticancer drug docetaxel, and a halogenated pyrimidine analogue 5-iodo-2'-deoxyuridine) or hyperthermia further enhances tumor cell killing. Beer, its certain constituents, or melatonin ameliorate heavy ion-induced damage to normal cells. In addition to effects in cells directly targeted with heavy ions, there is mounting evidence for nontargeted biological effects in cells that have not themselves been directly irradiated. The bystander effect of heavy ions manifests itself as the loss of clonogenic potential, a transient apoptotic response, delayed p53 phosphorylation, alterations in gene expression profiles, and the elevated frequency of gene mutations, micronuclei and chromosome aberrations, which arise in nonirradiated cells having received signals from irradiated cells. Proposed mediating mechanisms involve gap junctional intercellular communication, reactive oxygen species and nitric oxide. This paper reviews briefly the current knowledge of the biological effects of heavy-ion irradiation with a focus on recent findings regarding its potential benefits for therapeutic use as well as on the bystander effect.
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Affiliation(s)
- Nobuyuki Hamada
- Department of Quantum Biology, Division of Bioregulatory Medicine, Gunma University Graduate School of Medicine, Gunma, Japan.
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14
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Kelly EJ, Hadac EM, Greiner S, Russell SJ. Engineering microRNA responsiveness to decrease virus pathogenicity. Nat Med 2008; 14:1278-83. [PMID: 18953352 DOI: 10.1038/nm.1776] [Citation(s) in RCA: 170] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2008] [Accepted: 04/19/2008] [Indexed: 12/20/2022]
Abstract
The cellular tropisms of eukaryotic viruses are shaped by their need for entry receptors and intracellular transcription factors. Here we show that viral tropisms can also be regulated by tissue-specific microRNAs (miRNAs). Target sequences complementary to muscle-specific miRNAs were inserted into the 3' untranslated region (UTR) of an oncolytic picornavirus that causes lethal myositis in tumor-bearing mice. The recombinant virus still propagated in subcutaneous tumors, causing total regression and sustained viremia, but could not replicate in cells expressing complementary miRNAs and therefore did not cause myositis. This altered tropism was not due to insertional attenuation, as a control virus containing a 3' UTR insert with a disrupted miRNA target sequence fully retained its lethal myotropism. Tissue-specific destabilization of viral genomes by miRNA target insertion provides a potentially versatile new mechanism for controlling the tropism of replicating viruses for therapy and may serve as a new modality for attenuating viruses for vaccine purposes.
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Affiliation(s)
- Elizabeth J Kelly
- Department of Molecular Medicine, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA
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15
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Hingorani M, White CL, Zaidi S, Merron A, Peerlinck I, Gore ME, Nutting CM, Pandha HS, Melcher AA, Vile RG, Vassaux G, Harrington KJ. Radiation-mediated up-regulation of gene expression from replication-defective adenoviral vectors: implications for sodium iodide symporter gene therapy. Clin Cancer Res 2008; 14:4915-24. [PMID: 18676766 DOI: 10.1158/1078-0432.ccr-07-4049] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE To assess the effects of external beam radiotherapy (EBRT) on adenoviral-mediated transgene expression in vitro and in vivo and to define an optimal strategy for combining sodium iodide symporter (NIS)-mediated (131)I therapy with EBRT. EXPERIMENTAL DESIGN Expression of reporter genes [NIS, green fluorescent protein (GFP), beta-galactosidase (lacZ), and luciferase (Luc)] from replication-deficient adenoviruses was assessed in tumor cell lines under basal conditions and following irradiation. The effects of viral multiplicity of infection (MOI) and EBRT dose on the magnitude and duration of gene expression were determined. In vivo studies were done with Ad-CMV-GFP and Ad-RSV-Luc. RESULTS EBRT increased NIS, GFP, and beta-galactosidase expression in colorectal, head and neck, and lung cancer cells. Radiation dose and MOI were important determinants of response to EBRT, with greatest effects at higher EBRT doses and lower MOIs. Radiation exerted both transductional (through increased coxsackie-adenoviral receptor and integrin alpha(v)) and nontransductional effects, irrespective of promoter sequence (CMV, RSV, hTR, or hTERT). Analysis of the schedule of EBRT followed by viral infection revealed maximal transduction at 24 hours. Radiation maintained increasing radioiodide uptake from Ad-hTR-NIS over 6 days, in direct contrast to reducing levels in unirradiated cells. The effects of EBRT in increasing and maintaining adenovirus-mediated transgene expression were also seen in vivo using GFP- and luciferase-expressing adenoviral vectors. CONCLUSIONS Radiation increased the magnitude and duration of NIS gene expression from replication-deficient adenoviruses. The transductional effect is maximal at 24 hours, but radioiodide uptake is maintained at an elevated level over 6 days after infection.
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Affiliation(s)
- Mohan Hingorani
- Targeted Therapy Team, The Institute of Cancer Research, Chester Beatty Laboratories, Cancer Research UK Centre fo Cell and Molecular Biology, London, UK
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