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Hont AB, Dumont B, Sutton KS, Anderson J, Kentsis A, Drost J, Hong AL, Verschuur A. The tumor microenvironment and immune targeting therapy in pediatric renal tumors. Pediatr Blood Cancer 2022; 70 Suppl 2:e30110. [PMID: 36451260 DOI: 10.1002/pbc.30110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 10/28/2022] [Accepted: 10/31/2022] [Indexed: 12/04/2022]
Abstract
This review highlights the role of several immunomodulating elements contributing to the tumor microenvironment of various pediatric renal tumors including Wilms tumor. The roles of innate and adaptive immune cells in renal tumors are summarized as well as immunomodulatory cytokines and other proteins. The expression and the predictive role of checkpoint modulators like PD-L1 and immunomodulating proteins like glypican-3, B7-H3, COX-2 are highlighted with a translational view toward potential therapeutic innovations. We further discuss the current state of preclinical models in advancing this field of study. Finally, examples of clinical trials of immunomodulating strategies such as monoclonal antibodies and chimeric antigen receptor T (CAR-T) cells for relapsed/refractory/progressive pediatric renal tumors are described.
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Affiliation(s)
- Amy B Hont
- Department of Hematology/Oncology, Children's National Hospital, George Washington University, Washington, District of Columbia, USA
| | - Benoit Dumont
- Pediatric Hematology and Oncology Institute, Léon Bérard Cancer Center, Lyon, France
| | - Kathryn S Sutton
- Department of Pediatrics, Children's Healthcare of Atlanta, Emory University, Atlanta, Georgia, USA
| | - John Anderson
- Developmental Biology and Cancer Programme, UCL Great Ormond Street Institute of Child Health, London, UK
| | - Alex Kentsis
- Tow Center for Developmental Oncology, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center and Weill Medical College of Cornell University, New York, New York, USA
| | - Jarno Drost
- Princess Máxima Center and Oncode Institute, Utrecht, The Netherlands
| | - Andrew L Hong
- Department of Pediatrics, Children's Healthcare of Atlanta, Emory University, Atlanta, Georgia, USA
| | - Arnauld Verschuur
- Department of Pediatric Hematology and Oncology, Hôpital d'Enfants de la Timone, APHM, Marseille, France
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Abstract
Results of immunotherapy in childhood solid cancer have been so far, with the exception of neuroblastoma, quite disappointing. Lack of knowledge of the immune contexture of these tumors may have contributed to the failure of immunotherapies so far. Here, we systematically reviewed the literature regarding the immunology of Wilms tumor (WT), one of the most frequent pediatric solid tumors of the abdomen. In Wilms tumor patients the high cure rate of >90%, achieved by the combination of surgery and radio-chemotherapy, is at the expense of a high early and late toxicity. Moreover, treatment-resistant entities, such as diffuse anaplastic tumors or recurrent disease, still pose unsolved clinical problems. Successful immunotherapy could represent a novel and possibly less-toxic treatment option. Employing the PRISMA (Preferred Reporting Items for Systematic Review and Meta-Analysis) method of literature search, we analyzed the current knowledge of the immunological landscape of Wilms tumors in terms of tumor microenvironment, prognostic implications of single biomarkers, and immunotherapy response.
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Mahdavi Sharif P, Jabbari P, Razi S, Keshavarz-Fathi M, Rezaei N. Importance of TNF-alpha and its alterations in the development of cancers. Cytokine 2020; 130:155066. [PMID: 32208336 DOI: 10.1016/j.cyto.2020.155066] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
TNF-alpha is involved in many physiologic and pathologic cellular pathways, including cellular proliferation, differentiation, and death, regulation of immunologic reactions to different cells and molecules, local and vascular invasion of neoplasms, and destruction of tumor vasculature. It is obvious that because of integrated functions of TNF-alpha inside different physiologic systems, it cannot be used as a single-agent therapy for neoplasms; however, long-term investigation of its different cellular pathways has led to recognition of a variety of subsequent molecules with more specific interactions, and therefore, might be suitable as prognostic and therapeutic factors for neoplasms. Here, we will review different aspects of the TNF-alpha as a cytokine involved in both physiologic functions of cells and pathologic abnormalities, most importantly, cancers.
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Affiliation(s)
- Pouya Mahdavi Sharif
- Cancer Immunology Project (CIP), Universal Scientific Education and Research Network (USERN), Tehran, Iran; School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Parnian Jabbari
- Cancer Immunology Project (CIP), Universal Scientific Education and Research Network (USERN), Tehran, Iran
| | - Sepideh Razi
- Cancer Immunology Project (CIP), Universal Scientific Education and Research Network (USERN), Tehran, Iran; Student Research Committee, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Mahsa Keshavarz-Fathi
- Cancer Immunology Project (CIP), Universal Scientific Education and Research Network (USERN), Tehran, Iran; School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Nima Rezaei
- Research Center for Immunodeficiencies, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran; Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran; Cancer Immunology Project (CIP), Universal Scientific Education and Research Network (USERN), Sheffield, UK.
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Cruceriu D, Baldasici O, Balacescu O, Berindan-Neagoe I. The dual role of tumor necrosis factor-alpha (TNF-α) in breast cancer: molecular insights and therapeutic approaches. Cell Oncol (Dordr) 2020; 43:1-18. [PMID: 31900901 DOI: 10.1007/s13402-019-00489-1] [Citation(s) in RCA: 212] [Impact Index Per Article: 53.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/22/2019] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Breast cancer is the most prevalent cancer among women worldwide and the fifth cause of death among all cancer patients. Breast cancer development is driven by genetic and epigenetic alterations, with the tumor microenvironment (TME) playing an essential role in disease progression and evolution through mechanisms like inflammation promotion. TNF-α is one of the essential pro-inflammatory cytokines found in the TME of breast cancer patients, being secreted both by stromal cells, mainly by tumor-associated macrophages, and by the cancer cells themselves. In this review, we explore the biological and clinical impact of TNF-α in all stages of breast cancer development. First of all, we explore the correlation between TNF-α expression levels at the tumor site or in plasma/serum of breast cancer patients and their respective clinical status and outcome. Secondly, we emphasize the role of TNF-α signaling in both estrogen-positive and -negative breast cancer cells. Thirdly, we underline TNF-α involvement in epithelial-to-mesenchymal transition (EMT) and metastasis of breast cancer cells, and we point out the contribution of TNF-α to the development of acquired drug resistance. CONCLUSIONS Collectively, these data reveal a pro-tumorigenic role of TNF-α during breast cancer progression and metastasis. We systemize the knowledge regarding TNF-α-related therapies in breast cancer, and we explain how TNF-α may act as both a target and a drug in different breast cancer therapeutic approaches. By corroborating the known molecular effects of TNF-α signaling in breast cancer cells with the results from several preclinical and clinical trials, including TNF-α-related clinical observations, we conclude that the potential of TNF-α in breast cancer therapy promises to be of great interest.
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Affiliation(s)
- Daniel Cruceriu
- Department of Functional Genomics and Experimental Pathology, The Oncology Institute "Prof. Dr. Ion Chiricuta", Cluj-Napoca, Romania.,Department of Molecular Biology and Biotechnology, "Babes-Bolyai" University, Cluj-Napoca, Romania
| | - Oana Baldasici
- Department of Functional Genomics and Experimental Pathology, The Oncology Institute "Prof. Dr. Ion Chiricuta", Cluj-Napoca, Romania
| | - Ovidiu Balacescu
- Department of Functional Genomics and Experimental Pathology, The Oncology Institute "Prof. Dr. Ion Chiricuta", Cluj-Napoca, Romania. .,11th Department of Medical Oncology, "Iuliu Hatieganu" University of Medicine and Pharmacy, 34-36 Republicii Street, 400015, Cluj-Napoca, Romania.
| | - Ioana Berindan-Neagoe
- Department of Functional Genomics and Experimental Pathology, The Oncology Institute "Prof. Dr. Ion Chiricuta", Cluj-Napoca, Romania. .,Research Center for Functional Genomics, Biomedicine and Translational Medicine, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania. .,MedFuture Research Center for Advanced Medicine, "Iuliu Hatieganu" University of Medicine and Pharmacy, 23 Marinescu Street, 400337, Cluj-Napoca, Romania.
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Marayati R, Quinn CH, Beierle EA. Immunotherapy in Pediatric Solid Tumors-A Systematic Review. Cancers (Basel) 2019; 11:E2022. [PMID: 31847387 PMCID: PMC6966467 DOI: 10.3390/cancers11122022] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Revised: 12/07/2019] [Accepted: 12/12/2019] [Indexed: 12/27/2022] Open
Abstract
Despite advances in the treatment of many pediatric solid tumors, children with aggressive and high-risk disease continue to have a dismal prognosis. For those presenting with metastatic or recurrent disease, multiple rounds of intensified chemotherapy and radiation are the typical course of action, but more often than not, this fails to control the progression of the disease. Thus, new therapeutics are desperately needed to improve the outcomes for these children. Recent advances in our understanding of both the immune system's biology and its interaction with tumors have led to the development of novel immunotherapeutics as alternative treatment options for these aggressive malignancies. Immunotherapeutic approaches have shown promising results for pediatric solid tumors in early clinical trials, but challenges remain concerning safety and anti-tumor efficacy. In this review, we aim to discuss and summarize the main classes of immunotherapeutics used to treat pediatric solid tumors.
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Affiliation(s)
| | | | - Elizabeth A. Beierle
- Division of Pediatric Surgery, Department of Surgery, University of Alabama at Birmingham, Birmingham, AL 35294, USA; (R.M.); (C.H.Q.)
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Hinds PS, Wang J, Stern ED, Macpherson CF, Wharton CM, Okorosobo R, Cheng YI, Gross HE, Meany HJ, Jacobs S. Voices of children and adolescents on phase 1 or phase 2 cancer trials: A new trial endpoint? Cancer 2017; 123:3799-3806. [PMID: 28581685 PMCID: PMC5610606 DOI: 10.1002/cncr.30782] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 04/18/2017] [Accepted: 04/19/2017] [Indexed: 12/28/2022]
Abstract
BACKGROUND Pediatric participants on phase 1 or phase 2 clinical trials for incurable cancer are at risk of experiencing toxicities (adverse events [AEs]) related to trial participation. Multiple AEs are subjective; thus, the real impact of trial treatment cannot be known unless patient subjective reports are solicited. METHODS The authors assessed the feasibility and acceptability of soliciting symptom, function, and quality of life (QOL) reports from participants aged 8 to 18 years who were enrolled on phase 1/2 clinical trials at 4 cancer centers during the first course of chemotherapy. The authors also assessed the reliability and validity of 6 self-report Patient-Reported Outcomes Measurement Information System (PROMIS) pediatric measures and 4 open-ended interview questions at 2 time points (at the time of trial enrollment [T1] and 3 to 4 weeks later [T2]). RESULTS The enrollment rate of 75.9% (20 participants) exceeded the feasibility criterion, and missingness of measures by person, measure, and items at T1 and T2 were lower than the acceptability criteria. New QOL themes were limited to the impact of treatment on families and being away from home, family, and friends for treatment. All but one measure at T1 met the reliability criterion and all measures did so at T2. Validity support was limited however because as theorized, mobility decreased and fatigue increased as AEs increased. CONCLUSIONS Soliciting and documenting symptom, function, and QOL reports from patients aged 8 to 18 years who are enrolled on a phase 1/2 clinical trial is feasible and acceptable to participants, particularly when embedded in trials. Reliable and valid findings can result, making patient self-reported outcomes a possible new trial endpoint. Cancer 2017;123:3799-3806. © 2017 American Cancer Society.
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Affiliation(s)
- Pamela S Hinds
- Department of Nursing Research and Quality Outcomes, Children's National Health System, Washington, DC
- Department of Pediatrics, George Washington University, Washington, DC
| | - Jichuan Wang
- Department of Pediatrics, George Washington University, Washington, DC
- Division of Biostatistics and Study Methodology, Children's National Health System, Washington, DC
| | - Emily Dunn Stern
- Division of Hematology/Oncology, Children's National Health System, Washington, DC
| | | | - Claire M Wharton
- Division of Oncology, Seattle Children's Hospital, Seattle, Washington
| | | | - Yao Iris Cheng
- Division of Biostatistics and Study Methodology, Children's National Health System, Washington, DC
| | - Heather E Gross
- University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Holly J Meany
- Department of Pediatrics, George Washington University, Washington, DC
- Division of Hematology/Oncology, Children's National Health System, Washington, DC
| | - Shana Jacobs
- Department of Pediatrics, George Washington University, Washington, DC
- Division of Hematology/Oncology, Children's National Health System, Washington, DC
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Brok J, Pritchard-Jones K, Geller JI, Spreafico F. Review of phase I and II trials for Wilms' tumour - Can we optimise the search for novel agents? Eur J Cancer 2017; 79:205-213. [PMID: 28521171 DOI: 10.1016/j.ejca.2017.04.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 03/08/2017] [Accepted: 04/08/2017] [Indexed: 11/29/2022]
Abstract
Survival rates for patients with Wilms' tumour (WT) approximate 90% with refined use of currently available interventions. However, a subgroup of patients, with initial high-risk histopathology or relapsing disease, have a poor prognosis, and it is a challenge to identify and prioritise the development of new innovative approaches for these subgroups. We conducted a systematic literature search for published phase I and II clinical trials that registered patients with WTs and characterised the early phase trial activity, quantified response rates and highlighted avenues for further development. We identified 63 trials (48 phase I, three phase I/II, and 12 phase II trials) enrolling 214 patients with WTs, alongside other malignancies. The number of annually recruited WTs did not change significantly and was less than 20% of the potential candidates. The vast majority of the trials were conducted in North America, and 56 different interventions were investigated, including conventional chemotherapy and biologically targeted therapies. Overall, 33 WTs revealed some degree of tumour control. Of these, five patients demonstrated complete remission (2%), 15 patients partial response (7%) and 13 patients stable disease (6%). None of the included novel biologically targeted therapies emerged as promising interventions, and only conventional chemotherapy was able to induce a complete and partial response. We conclude that early phase trial recruitment of WTs is below expected levels, and the clinical outcome of the included patients is dismal. Improvement of the availability and recruitment to early phase trials for WTs, especially in Europe, is needed.
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Affiliation(s)
- Jesper Brok
- University College London, Great Ormond Street Institute of Child Health, UK; Department of Paediatric Haematology and Oncology, Rigshospitalet, Copenhagen University Hospital, Denmark.
| | | | - James I Geller
- Division of Pediatric Oncology, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, OH, USA
| | - Filippo Spreafico
- Department of Hematology and Pediatric Onco-Hematology, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
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Capitini CM, Otto M, DeSantes KB, Sondel PM. Immunotherapy in pediatric malignancies: current status and future perspectives. Future Oncol 2015; 10:1659-78. [PMID: 25145434 DOI: 10.2217/fon.14.62] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Novel immune-based therapies are becoming available as additions to, and in some cases as alternatives to, the traditional treatment modalities such as chemotherapy, surgery and radiation that have improved outcomes for childhood cancer for decades. In this article, we will discuss what immunotherapies are being tested in the clinic, barriers to widespread application, and the future of immuno-oncology for childhood cancer. While in many cases, these therapies have shown dramatic responses in the setting of refractory or relapsed cancer, much remains to be learned about how to integrate these therapies into existing upfront regimens. The progress and challenges of developing immunotherapies for childhood cancer in a timely and cost-effective fashion will be discussed.
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Affiliation(s)
- Christian M Capitini
- Department of Pediatrics & Carbone Cancer Center, University of Wisconsin School of Medicine & Public Health, 1111 Highland Avenue, WIMR 4137, Madison, WI 53705, USA
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MacIsaac KD, Baumgartner R, Kang J, Loboda A, Peterfy C, DiCarlo J, Riek J, Beals C. Pre-treatment whole blood gene expression is associated with 14-week response assessed by dynamic contrast enhanced magnetic resonance imaging in infliximab-treated rheumatoid arthritis patients. PLoS One 2014; 9:e113937. [PMID: 25504080 PMCID: PMC4264695 DOI: 10.1371/journal.pone.0113937] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Accepted: 10/28/2014] [Indexed: 11/20/2022] Open
Abstract
Approximately 30% of rheumatoid arthritis patients achieve inadequate response to anti-TNF biologics. Attempts to identify molecular biomarkers predicting response have met with mixed success. This may be attributable, in part, to the variable and subjective disease assessment endpoints with large placebo effects typically used to classify patient response. Sixty-one patients with active RA despite methotrexate treatment, and with MRI-documented synovitis, were randomized to receive infliximab or placebo. Blood was collected at baseline and genome-wide transcription in whole blood was measured using microarrays. The primary endpoint in this study was determined by measuring the transfer rate constant (Ktrans) of a gadolinium-based contrast agent from plasma to synovium using MRI. Secondary endpoints included repeated clinical assessments with DAS28(CRP), and assessments of osteitis and synovitis by the RAMRIS method. Infliximab showed greater decrease from baseline in DCE-MRI Ktrans of wrist and MCP at all visits compared with placebo (P<0.001). Statistical analysis was performed to identify genes associated with treatment-specific 14-week change in Ktrans. The 256 genes identified were used to derive a gene signature score by averaging their log expression within each patient. The resulting score correlated with improvement of Ktrans in infliximab-treated patients and with deterioration of Ktrans in placebo-treated subjects. Poor responders showed high expression of activated B-cell genes whereas good responders exhibited a gene expression pattern consistent with mobilization of neutrophils and monocytes and high levels of reticulated platelets. This gene signature was significantly associated with clinical response in two previously published whole blood gene expression studies using anti-TNF therapies. These data provide support for the hypothesis that anti-TNF inadequate responders comprise a distinct molecular subtype of RA characterized by differences in pre-treatment blood mRNA expression. They also highlight the importance of placebo controls and robust, objective endpoints in biomarker discovery. Trial Registration: ClinicalTrials.gov NCT01313520
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Affiliation(s)
- Kenzie D. MacIsaac
- Merck & Co. Inc., Department of Genetics and Pharmacogenomics, Boston, Massachusetts, United States of America
- * E-mail:
| | - Richard Baumgartner
- Merck & Co. Inc., Department of Biometrics Research, Whitehouse Station, New Jersey, United States of America
| | - Jia Kang
- Merck & Co. Inc., Department of Biometrics Research, Whitehouse Station, New Jersey, United States of America
| | - Andrey Loboda
- Merck & Co. Inc., Department of Genetics and Pharmacogenomics, Boston, Massachusetts, United States of America
| | - Charles Peterfy
- Spire Sciences Inc., Boca Raton, Florida, United States of America
| | - Julie DiCarlo
- Spire Sciences Inc., Boca Raton, Florida, United States of America
| | - Jonathan Riek
- Virtual Scopics, Rochester, New York, United States of America
| | - Chan Beals
- Merck & Co. Inc., Clinical Research, Whitehouse Station, New Jersey, United States of America
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Roberts NJ, Zhou S, Diaz LA, Holdhoff M. Systemic use of tumor necrosis factor alpha as an anticancer agent. Oncotarget 2012; 2:739-51. [PMID: 22036896 PMCID: PMC3248159 DOI: 10.18632/oncotarget.344] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Tumor necrosis factor-α (TNF-α) has been discussed as a potential anticancer agent for many years, however initial enthusiasm about its clinical use as a systemic agent was curbed due to significant toxicities and lack of efficacy. Combination of TNF-α with chemotherapy in the setting of hyperthermic isolated limb perfusion (ILP), has provided new insights into a potential therapeutic role of this agent. The therapeutic benefit from TNF-α in ILP is thought to be not only due to its direct anti-proliferative effect, but also due to its ability to increase penetration of the chemotherapeutic agents into the tumor tissue. New concepts for the use of TNF-α as a facilitator rather than as a direct actor are currently being explored with the goal to exploit the ability of this agent to increase drug delivery and to simultaneously reduce systemic toxicity. This review article provides a comprehensive overview on the published previous experience with systemic TNF-α. Data from 18 phase I and 10 phase II single agent as well as 18 combination therapy studies illustrate previously used treatment and dose schedules, response data as well as the most prominently observed adverse effects. Also discussed, based on recent preclinical data, is a potential future role of systemic TNF-α in combination with liposomal chemotherapy to facilitate increased drug uptake into tumors.
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Affiliation(s)
- Nicholas J Roberts
- Ludwig Center for Cancer Genetics and Therapeutics, The Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University, Baltimore, MD 21231, USA
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Huang KM, Peng M, Feng YQ, Huang H, Tu HJ, Luo J, Zhang L, Yuan XH, Wang LC. Cryosurgery and rhTNF-α play synergistic effects on a rat cortex C6 glioma model. Cryobiology 2012; 64:43-9. [DOI: 10.1016/j.cryobiol.2011.09.137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2010] [Revised: 09/05/2011] [Accepted: 09/21/2011] [Indexed: 10/17/2022]
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Cuevas EP, Escribano O, Monserrat J, Martínez-Botas J, Sánchez MG, Chiloeches A, Hernández-Breijo B, Sánchez-Alonso V, Román ID, Fernández-Moreno MD, Guijarro LG. RNAi-mediated silencing of insulin receptor substrate-4 enhances actinomycin D- and tumor necrosis factor-alpha-induced cell death in hepatocarcinoma cancer cell lines. J Cell Biochem 2010; 108:1292-301. [PMID: 19795387 DOI: 10.1002/jcb.22359] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Insulin receptor substrate-4 (IRS-4) transmits signals from the insulin-like growth factor receptor (IGF-IR) and the insulin receptor (IR) to the PI3K/AKT and the ERK1/2 pathways. IRS-4 expression increases dramatically after partial hepatectomy and plays an important role in HepG2 hepatoblastoma cell line proliferation/differentiation. In human hepatocarcinoma, IRS-4 overexpression has been associated with tumor development. Herein, we describe the mechanism whereby IRS-4 depletion induced by RNA interference (siRNA) sensitizes HepG2 cells to treatment with actinomycin D (Act D) and combined treatment with Act D plus tumor necrosis factor-alpha (TNF-alpha). Similar results have been obtained in HuH 7 and Chang cell lines. Act D therapy drove the cells to a mitochondrial-dependent apoptotic program involving cytochrome c release, caspase 3 activation, PARP fragmentation and DNA laddering. TNF-alpha amplifies the effect of Act D on HepG2 cell apoptosis increasing c-jun N-terminal kinase (JNK) activity, IkappaB-alpha proteolysis and glutathione depletion. IRS-4 depleted cells that were treated with Act D showed an increase in cytochrome c release and procaspase 3 and PARP proteolysis with respect to control cells. The mechanism involved in IRS-4 action is independent of Akt, IkappaB kinase and JNK. IRS-4 down regulation, however, decreased gamma-glutamylcysteine synthetase content and cell glutathione level in the presence of Act D plus TNF-alpha. These results suggest that IRS-4 protects HepG2 cells from oxidative stress induced by drug treatment.
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Affiliation(s)
- Eva P Cuevas
- Unidad de Toxicología Molecular Hepática, Departamento de Bioquímica y Biología Molecular, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD). Universidad de Alcalá, E-28871 Alcalá de Henares, Spain
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13
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Abstract
PURPOSE OF REVIEW We will review the 2007/2008 literature on pediatric genitourinary tumors. RECENT FINDINGS Newly identified constitutional epigenetic defects in Wilms tumor genes extend the understanding of Wilms tumor risk in children lacking syndromic features, and add to the complexity of the pathogenesis of these tumor suppressor genes. Pediatric renal cell carcinoma has distinct molecular characteristics and clinical associations from the adult counterpart. The pathway from PAX3-FKHR translocation to the development of rhabdomyosarcoma tumors has been further elucidated. SUMMARY Therapeutic strategies continue to be driven by developments in molecular diagnostics in pediatric genitourinary tumors.
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Affiliation(s)
- Sharon M Castellino
- Department of Pediatrics, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, USA.
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