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Hu Y, Gu Y, Song Y, Zhao Y, Wang J, Ma J, Sui F. Differential expression and prognostic value of TLR4 in kidney renal clear cell carcinoma. Mol Cell Probes 2024; 75:101959. [PMID: 38579915 DOI: 10.1016/j.mcp.2024.101959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 03/23/2024] [Accepted: 03/25/2024] [Indexed: 04/07/2024]
Abstract
Human Toll-like receptor (TLR) family plays a crucial role in immunity and cancer progression. However, the specific role of human Toll-like receptor 4 (TLR4) in kidney renal clear cell carcinoma (KIRC) remains obscure. Thus, we used single-cell RNA sequencing (RNA-seq) and bulk RNA-seq data combined with in vitro studies to evaluate the expression and prognostic value of TLR4 in KIRC. In our study, we observed that TLR4 was over expressed in KIRC tissues compared to normal renal tissues. And the expression of TLR4 was higher in macrophages/monocytes than other cell types. Besides, there is a close association between TLR4 expression and immune cell infiltration (Neutrophils, Macrophages, T cells and B cells) in KIRC. Immunohistochemical staining also showed that TLR4 was overexpressed in inflammatory infiltration renal tissue compared with normal tissue. Meanwhile, high expression of TLR4 exhibited correlations with improved survival, lower tumor grade and stage. Interestingly, the protective significance of TLR4 only showed in female patients (HR = 0.37, P < 0.01), other than male patients (HR = 0.71, P = 0.08) with KIRC. Consistently, KIRC samples with lymph node metastasis showed lower expression of TLR4. Knockdown of TLR4 in 786-O cell line increased cell proliferation and clonogenic capacity. In summary, this study found TLR4 could inhibit the progression of kidney cancer and was associated with improved survival in KIRC. The overexpression of TLR4 in macrophages and the close association between TLR4 and immune cell infiltration also underline the critical role of TLR4 in building the immune microenvironment for kidney cancer. These results may offer insights into the mechanism and immune microenvironment of kidney cancer.
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Affiliation(s)
- Yaguang Hu
- Department of Ophthalmology, The First Affiliated Hospital of Xi'an Jiaotong University, 277 Yan-ta West Road, Xi'an, Shaanxi, 710061, China
| | - Yanan Gu
- Department of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, 277 Yan-ta West Road, Xi'an, Shaanxi, 710061, China; Department of Urology, The First Affiliated Hospital of Xi'an Jiaotong University, 277 Yan-ta West Road, Xi'an, Shaanxi, 710061, China
| | - Yichen Song
- Xi'an Jiaotong University, 277 Yan-ta West Road, Xi'an, Shaanxi, 710061, China
| | - Yuelei Zhao
- Xi'an Jiaotong University, 277 Yan-ta West Road, Xi'an, Shaanxi, 710061, China
| | - Jiachen Wang
- Xi'an Jiaotong University, 277 Yan-ta West Road, Xi'an, Shaanxi, 710061, China
| | - Junchi Ma
- School of Information Engineering, Chang'an University, Xi'an, China.
| | - Fang Sui
- Department of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, 277 Yan-ta West Road, Xi'an, Shaanxi, 710061, China.
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2
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Bisaccia J, Meyer S, Bertrand-Chapel A, Hecquet Q, Barbet V, Kaniewski B, Léon S, Gadot N, Rochet I, Fajnorova I, Leblond P, Cordier-Bussat M, Corradini N, Vasiljevic A, Billaud M, Picard C, Broutier L, Gallerne C, Dutour A, Blay JY, Castets M. The TLR3 L412F polymorphism prevents TLR3-mediated tumor cell death induction in pediatric sarcomas. Cell Death Discov 2023; 9:230. [PMID: 37414800 DOI: 10.1038/s41420-023-01513-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 06/12/2023] [Accepted: 06/21/2023] [Indexed: 07/08/2023] Open
Abstract
Toll-like receptor 3 (TLR3) is a pattern recognition receptor mainly known for its role in innate immune response to infection. Indeed, binding of double-stranded RNA (dsRNA) to TLR3 triggers a pro-inflammatory cascade leading to cytokine release and immune cell activation. Its anti-tumoral potential has emerged progressively, associated with a direct impact on tumor cell death induction and with an indirect action on immune system reactivation. Accordingly, TLR3 agonists are currently being tested in clinical trials for several adult cancers. Meanwhile, TLR3 variants have been linked to auto-immune disorders, and as risk factors of viral infection and cancers. However, aside from neuroblastoma, TLR3 role in childhood cancers has not been evaluated. Here, by integrating public transcriptomic data of pediatric tumors, we unveil that high TLR3 expression is largely associated with a better prognosis in childhood sarcomas. Using osteosarcomas and rhabdomyosarcomas as models, we show that TLR3 efficiently drives tumor cell death in vitro and induces tumor regression in vivo. Interestingly, this anti-tumoral effect was lost in cells expressing the homozygous TLR3 L412F polymorphism, which is enriched in a rhabdomyosarcomas cohort. Thus, our results demonstrate the therapeutic potential associated with the targeting of TLR3 in pediatric sarcomas, but also the need to stratify patients eligible for this clinical approach with respect to the TLR3 variants expressed.
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Affiliation(s)
- Joseph Bisaccia
- Cell Death and Childhood Cancers Laboratory, LabEx DEV2CAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052- CNRS UMR5286, Université Claude Bernard de Lyon, Centre Léon Bérard, Institut Convergence Plascan, Lyon, France
| | - Swann Meyer
- Cell Death and Childhood Cancers Laboratory, LabEx DEV2CAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052- CNRS UMR5286, Université Claude Bernard de Lyon, Centre Léon Bérard, Institut Convergence Plascan, Lyon, France
| | - Adrien Bertrand-Chapel
- Cell Death and Childhood Cancers Laboratory, LabEx DEV2CAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052- CNRS UMR5286, Université Claude Bernard de Lyon, Centre Léon Bérard, Institut Convergence Plascan, Lyon, France
| | - Quentin Hecquet
- Cell Death and Childhood Cancers Laboratory, LabEx DEV2CAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052- CNRS UMR5286, Université Claude Bernard de Lyon, Centre Léon Bérard, Institut Convergence Plascan, Lyon, France
| | - Virginie Barbet
- Cell Death and Childhood Cancers Laboratory, LabEx DEV2CAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052- CNRS UMR5286, Université Claude Bernard de Lyon, Centre Léon Bérard, Institut Convergence Plascan, Lyon, France
| | - Bastien Kaniewski
- Cell Death and Childhood Cancers Laboratory, LabEx DEV2CAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052- CNRS UMR5286, Université Claude Bernard de Lyon, Centre Léon Bérard, Institut Convergence Plascan, Lyon, France
| | - Sophie Léon
- EX-VIVO Platform, Université de Lyon, Université Claude Bernard de Lyon, INSERM 1052, CNRS 5286, Centre Léon Bérard, Centre de recherche en cancérologie de Lyon (CRCL), Lyon, France
| | - Nicolas Gadot
- Anatomopathology Research Platform, Department of Translational Research and Innovation, Centre Léon Bérard, Lyon, France
| | - Isabelle Rochet
- Department of Pathology, Hôpital Femme-Mère-Enfant, Hospices Civils de Lyon, Université de Lyon, Lyon, France
| | - Iveta Fajnorova
- Cell Death and Childhood Cancers Laboratory, LabEx DEV2CAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052- CNRS UMR5286, Université Claude Bernard de Lyon, Centre Léon Bérard, Institut Convergence Plascan, Lyon, France
| | - Pierre Leblond
- Cell Death and Childhood Cancers Laboratory, LabEx DEV2CAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052- CNRS UMR5286, Université Claude Bernard de Lyon, Centre Léon Bérard, Institut Convergence Plascan, Lyon, France
- Department of Pediatric Oncology, Institut d'hématologie et d'oncologie pédiatrique, Centre Léon Bérard, Lyon, France
- Department of Translational Research in Paediatric Oncology, Centre Léon Bérard, Lyon, France
- Department of Pediatric Oncology, Institut d'Hématologie et d'Oncologie Pédiatrique, Centre Léon Bérard, Lyon, France
| | - Martine Cordier-Bussat
- Cell Death and Childhood Cancers Laboratory, LabEx DEV2CAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052- CNRS UMR5286, Université Claude Bernard de Lyon, Centre Léon Bérard, Institut Convergence Plascan, Lyon, France
- Department of Translational Research in Paediatric Oncology, Centre Léon Bérard, Lyon, France
| | - Nadège Corradini
- Cell Death and Childhood Cancers Laboratory, LabEx DEV2CAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052- CNRS UMR5286, Université Claude Bernard de Lyon, Centre Léon Bérard, Institut Convergence Plascan, Lyon, France
- Department of Pediatric Oncology, Institut d'hématologie et d'oncologie pédiatrique, Centre Léon Bérard, Lyon, France
- Department of Translational Research in Paediatric Oncology, Centre Léon Bérard, Lyon, France
- Department of Pediatric Oncology, Institut d'Hématologie et d'Oncologie Pédiatrique, Centre Léon Bérard, Lyon, France
| | - Alexandre Vasiljevic
- Department of Pathology, Hôpital Femme-Mère-Enfant, Hospices Civils de Lyon, Université de Lyon, Lyon, France
| | - Marc Billaud
- Cell Death and Childhood Cancers Laboratory, LabEx DEV2CAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052- CNRS UMR5286, Université Claude Bernard de Lyon, Centre Léon Bérard, Institut Convergence Plascan, Lyon, France
- Department of Translational Research in Paediatric Oncology, Centre Léon Bérard, Lyon, France
| | - Cécile Picard
- Department of Pathology, Hôpital Femme-Mère-Enfant, Hospices Civils de Lyon, Université de Lyon, Lyon, France
| | - Laura Broutier
- Cell Death and Childhood Cancers Laboratory, LabEx DEV2CAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052- CNRS UMR5286, Université Claude Bernard de Lyon, Centre Léon Bérard, Institut Convergence Plascan, Lyon, France
- Department of Translational Research in Paediatric Oncology, Centre Léon Bérard, Lyon, France
| | - Cindy Gallerne
- Cell Death and Childhood Cancers Laboratory, LabEx DEV2CAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052- CNRS UMR5286, Université Claude Bernard de Lyon, Centre Léon Bérard, Institut Convergence Plascan, Lyon, France
| | - Aurélie Dutour
- Cell Death and Childhood Cancers Laboratory, LabEx DEV2CAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052- CNRS UMR5286, Université Claude Bernard de Lyon, Centre Léon Bérard, Institut Convergence Plascan, Lyon, France
- Department of Translational Research in Paediatric Oncology, Centre Léon Bérard, Lyon, France
| | - Jean-Yves Blay
- Cell Death and Childhood Cancers Laboratory, LabEx DEV2CAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052- CNRS UMR5286, Université Claude Bernard de Lyon, Centre Léon Bérard, Institut Convergence Plascan, Lyon, France
- Department of Translational Research in Paediatric Oncology, Centre Léon Bérard, Lyon, France
| | - Marie Castets
- Cell Death and Childhood Cancers Laboratory, LabEx DEV2CAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052- CNRS UMR5286, Université Claude Bernard de Lyon, Centre Léon Bérard, Institut Convergence Plascan, Lyon, France.
- Department of Translational Research in Paediatric Oncology, Centre Léon Bérard, Lyon, France.
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3
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Telikani Z, Monson EA, Hofer MJ, Helbig KJ. Antiviral response within different cell types of the CNS. Front Immunol 2022; 13:1044721. [PMID: 36458002 PMCID: PMC9706196 DOI: 10.3389/fimmu.2022.1044721] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 10/31/2022] [Indexed: 01/28/2024] Open
Abstract
The central nervous system (CNS) is a constitutive structure of various cell types conserved by anatomical barriers. Many of the major CNS cell-type populations distributed across the different brain regions are targets for several neurotropic viruses. Numerous studies have demonstrated that viral susceptibility within the CNS is not absolute and initiates a cell-type specific antiviral defence response. Neurons, astrocytes, and microglial cells are among the major resident cell populations within the CNS and are all equipped to sense viral infection and induce a relative antiviral response mostly through type I IFN production, however, not all these cell types adopt a similar antiviral strategy. Rising evidence has suggested a diversity regarding IFN production and responsiveness based on the cell type/sub type, regional distinction and cell`s developmental state which could shape distinct antiviral signatures. Among CNS resident cell types, neurons are of the highest priority to defend against the invading virus due to their poor renewable nature. Therefore, infected and uninfected glial cells tend to play more dominant antiviral roles during a viral infection and have been found to be the major CNS IFN producers. Alternatively, neuronal cells do play an active part during antiviral responses but may adopt differential strategies in addition to induction of a typical type I IFN response, to minimize the chance of cellular damage. Heterogeneity observed in neuronal IFN responsiveness may be partially explained by their altered ISGs and/or lower STATS expression levels, however, further in vivo studies are required to fully elucidate the specificity of the acquired antiviral responses by distinct CNS cell types.
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Affiliation(s)
- Zahra Telikani
- School of Agriculture, Biomedicine and Environment, La Trobe University, Melbourne, VIC, Australia
| | - Ebony A. Monson
- School of Agriculture, Biomedicine and Environment, La Trobe University, Melbourne, VIC, Australia
| | - Markus J. Hofer
- School of Life and Environmental Sciences, Charles Perkins Centre and the Institute for Infectious Diseases, The University of Sydney, Sydney, NSW, Australia
| | - Karla J. Helbig
- School of Agriculture, Biomedicine and Environment, La Trobe University, Melbourne, VIC, Australia
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Epigenetic state determines inflammatory sensing in neuroblastoma. Proc Natl Acad Sci U S A 2022; 119:2102358119. [PMID: 35121657 PMCID: PMC8832972 DOI: 10.1073/pnas.2102358119] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/23/2021] [Indexed: 02/06/2023] Open
Abstract
Immunotherapy has revolutionized cancer treatment, but many cancers are not impacted by currently available immunotherapeutic strategies. Here, we investigated inflammatory signaling pathways in neuroblastoma, a classically "cold" pediatric cancer. By testing the functional response of a panel of 20 diverse neuroblastoma cell lines to three different inflammatory stimuli, we found that all cell lines have intact interferon signaling, and all but one lack functional cytosolic DNA sensing via cGAS-STING. However, double-stranded RNA (dsRNA) sensing via Toll-like receptor 3 (TLR3) was heterogeneous, as was signaling through other dsRNA sensors and TLRs more broadly. Seven cell lines showed robust response to dsRNA, six of which are in the mesenchymal epigenetic state, while all unresponsive cell lines are in the adrenergic state. Genetically switching adrenergic cell lines toward the mesenchymal state fully restored responsiveness. In responsive cells, dsRNA sensing results in the secretion of proinflammatory cytokines, enrichment of inflammatory transcriptomic signatures, and increased tumor killing by T cells in vitro. Using single-cell RNA sequencing data, we show that human neuroblastoma cells with stronger mesenchymal signatures have a higher basal inflammatory state, demonstrating intratumoral heterogeneity in inflammatory signaling that has significant implications for immunotherapeutic strategies in this aggressive childhood cancer.
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5
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Smyth R, Sun J. Protein Kinase R in Bacterial Infections: Friend or Foe? Front Immunol 2021; 12:702142. [PMID: 34305942 PMCID: PMC8297547 DOI: 10.3389/fimmu.2021.702142] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 06/28/2021] [Indexed: 12/28/2022] Open
Abstract
The global antimicrobial resistance crisis poses a significant threat to humankind in the coming decades. Challenges associated with the development of novel antibiotics underscore the urgent need to develop alternative treatment strategies to combat bacterial infections. Host-directed therapy is a promising new therapeutic strategy that aims to boost the host immune response to bacteria rather than target the pathogen itself, thereby circumventing the development of antibiotic resistance. However, host-directed therapy depends on the identification of druggable host targets or proteins with key functions in antibacterial defense. Protein Kinase R (PKR) is a well-characterized human kinase with established roles in cancer, metabolic disorders, neurodegeneration, and antiviral defense. However, its role in antibacterial defense has been surprisingly underappreciated. Although the canonical role of PKR is to inhibit protein translation during viral infection, this kinase senses and responds to multiple types of cellular stress by regulating cell-signaling pathways involved in inflammation, cell death, and autophagy – mechanisms that are all critical for a protective host response against bacterial pathogens. Indeed, there is accumulating evidence to demonstrate that PKR contributes significantly to the immune response to a variety of bacterial pathogens. Importantly, there are existing pharmacological modulators of PKR that are well-tolerated in animals, indicating that PKR is a feasible target for host-directed therapy. In this review, we provide an overview of immune cell functions regulated by PKR and summarize the current knowledge on the role and functions of PKR in bacterial infections. We also review the non-canonical activators of PKR and speculate on the potential mechanisms that trigger activation of PKR during bacterial infection. Finally, we provide an overview of existing pharmacological modulators of PKR that could be explored as novel treatment strategies for bacterial infections.
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Affiliation(s)
- Robin Smyth
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, Canada
| | - Jim Sun
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, Canada.,Centre for Infection, Immunity and Inflammation, University of Ottawa, Ottawa, ON, Canada
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6
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Caspase-8 deficiency induces a switch from TLR3 induced apoptosis to lysosomal cell death in neuroblastoma. Sci Rep 2021; 11:10609. [PMID: 34011952 PMCID: PMC8134575 DOI: 10.1038/s41598-021-89793-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 03/10/2021] [Indexed: 01/16/2023] Open
Abstract
In cancer cells only, TLR3 acquires death receptor properties by efficiently triggering the extrinsic pathway of apoptosis with Caspase-8 as apical protease. Here, we demonstrate that in the absence of Caspase-8, activation of TLR3 can trigger a form of programmed cell death, which is distinct from classical apoptosis. When TLR3 was activated in the Caspase-8 negative neuroblastoma cell line SH-SY5Y, cell death was accompanied by lysosomal permeabilization. Despite caspases being activated, lysosomal permeabilization as well as cell death were not affected by blocking caspase-activity, positioning lysosomal membrane permeabilization (LMP) upstream of caspase activation. Taken together, our data suggest that LMP with its deadly consequences represents a “default” death mechanism in cancer cells, when Caspase-8 is absent and apoptosis cannot be induced.
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7
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5-aza-2'-Deoxycytidine Induces a RIG-I-Related Innate Immune Response by Modulating Mitochondria Stress in Neuroblastoma. Cells 2020; 9:cells9091920. [PMID: 32824929 PMCID: PMC7564572 DOI: 10.3390/cells9091920] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 08/15/2020] [Indexed: 02/07/2023] Open
Abstract
Background: Neuroblastoma (NB) is one of the most common malignant solid tumors to occur in children, characterized by a wide range of genetic and epigenetic aberrations. We studied whether modifications of the latter with a 5-aza-2′-deoxycytidine (decitabine, Dac) DNA methyltransferase inhibitor can provide a therapeutic advantage in NB. Methods: NB cells with or without MYCN amplification were treated with Dac. We used flow cytometry to measure cell apoptosis and death and mitochondrial reactive oxygen species (mtROS), microarray to analyze gene expression profile and bisulfite pyrosequencing to determine the methylation level of the DDX58/RIG-I promoter. Western blot was used to detect markers related to innate immune response and apoptotic signaling, while immunofluorescent imaging was used to determine dsRNA. We generated mtDNA depleted ρ0 cells using long-term exposure to low-dose ethidium bromide. Results: Dac preferentially induced a RIG-I-predominant innate immune response and cell apoptosis in SK-N-AS NB cells, significantly reduced the methylation level of the DDX58/RIG-I promoter and increased dsRNA accumulation in the cytosol. Dac down regulated mitochondrial genes related to redox homeostasis, but augmented mtROS production. ρ0 cells demonstrated a blunted response in innate immune response and apoptotic cell death, as well as greatly diminished dsRNA. The response of NB cells to CDDP and poly(I:C) was potentiated by Dac in association with increased mtROS, which was blunted in ρ0 cells. Conclusions: This study indicates that Dac effectively induces a RIG-I-related innate immune response and apoptotic signaling primarily in SK-N-AS NB cells by hypomethylating DDX58/RIG-I promoter, elevated mtROS and increased dsRNA. Dac can potentiate the cytotoxic effects of CDDP and poly(I:C) in NB cells.
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Chuang HC, Lin HY, Liao PL, Huang CC, Lin LL, Hsu WM, Chuang JH. Immunomodulator polyinosinic-polycytidylic acid enhances the inhibitory effect of 13-cis-retinoic acid on neuroblastoma through a TLR3-related immunogenic-apoptotic response. J Transl Med 2020; 100:606-618. [PMID: 31857701 DOI: 10.1038/s41374-019-0356-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 10/18/2019] [Accepted: 11/03/2019] [Indexed: 11/10/2022] Open
Abstract
High-risk neuroblastoma is associated with low long-term survival rates due to recurrence or metastasis. Retinoids, including 13-cis-retinoic acid (13cRA), are commonly used for the treatment of high-risk neuroblastoma after myeloablative therapy; however, there are significant side effects and resistance rates. In this study, we demonstrated that 13cRA has a better antiproliferative effect in MYCN-amplified neuroblastoma cells than in MYCN-nonamplified neuroblastoma cells. In MYCN-amplified SK-N-DZ cells, 13cRA induced significant upregulation of toll-like receptor 3 (TLR3) and mitochondrial antiviral-signaling protein (MAVS) expression in a time-dependent manner. Furthermore, poly (I:C), a synthetic agonist of TLR3, effectively synergized with 13cRA to enhance antiproliferative effects through upregulation of the innate immune signaling and the mitochondrial stress response, leading to augmentation of the apoptotic response in 13cRA-responsive cancer cells. In addition, the 13cRA/poly (I:C) combination induced neural differentiation through activation of retinoic acid receptors beta (RAR-β), restoring expression of α-thalassemia/mental retardation syndrome X-linked (ATRX) protein, and inhibiting vessel formation, leading to retarded tumor growth in a mouse xenograft model. These results suggest that the combination of poly (I:C) and RA may provide synergistic therapeutic benefits for treatment of patients with high-risk neuroblastoma.
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Affiliation(s)
- Hui-Ching Chuang
- Department of Otolaryngology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan.,Mitochondrial Research Unit, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Hung-Yu Lin
- Mitochondrial Research Unit, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan.,Department of Pediatric surgery, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Pei-Lin Liao
- Mitochondrial Research Unit, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan.,Department of Pediatric surgery, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Chao-Cheng Huang
- Department of Pathology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Li-Ling Lin
- Department of Molecular Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Wen-Ming Hsu
- Department of Surgery, National Taiwan University Hospital, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Jiin-Haur Chuang
- Mitochondrial Research Unit, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan. .,Department of Pediatric surgery, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan.
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9
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Zhan Y, Liu L, Zhao T, Sun J, Cui D, Li Y, Chang Y. MicroRNAs involved in innate immunity regulation in the sea cucumber: A review. FISH & SHELLFISH IMMUNOLOGY 2019; 95:297-304. [PMID: 31669896 DOI: 10.1016/j.fsi.2019.10.049] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 08/23/2019] [Accepted: 10/23/2019] [Indexed: 06/10/2023]
Abstract
The sea cucumber is one of the most economically significant echinoderms. The immunity against exogenous stimulation of sea cucumber is of great academic and economic importance. MicroRNAs (miRNAs) are a class of short endogenous non-coding RNAs (ncRNAs) that are considered as vital regulators of both innate and adaptive immune responses in most eukaryotes. In sea cucumbers, some miRNAs (such as miR-133, miR-137, and miR-2008, among others) that participate in the regulation of innate immunity have been recently identified and characterized. This review focuses on those known miRNAs and their corresponding target genes that participate in the regulation of the complement system, Toll-like receptor (TLR) pathway, reactive oxygen species (ROS) production and apoptosis pathways in sea cucumbers. Moreover, we cover immune-related miRNA investigations in sea cucumbers that provide insights into developing more miRNA-based biomarkers and therapeutic strategies for sea cucumber diseases.
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Affiliation(s)
- Yaoyao Zhan
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian, Liaoning, 116023, PR China
| | - Li Liu
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian, Liaoning, 116023, PR China
| | - Tanjun Zhao
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian, Liaoning, 116023, PR China
| | - Jingxian Sun
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian, Liaoning, 116023, PR China
| | - Dongyao Cui
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian, Liaoning, 116023, PR China
| | - Yingying Li
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian, Liaoning, 116023, PR China
| | - Yaqing Chang
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian, Liaoning, 116023, PR China.
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10
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Lin LL, Huang CC, Wu MT, Hsu WM, Chuang JH. Innate immune sensor laboratory of genetics and physiology 2 suppresses tumor cell growth and functions as a prognostic marker in neuroblastoma. Cancer Sci 2018; 109:3494-3502. [PMID: 30179292 PMCID: PMC6215871 DOI: 10.1111/cas.13790] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 07/07/2018] [Accepted: 08/27/2018] [Indexed: 12/24/2022] Open
Abstract
The innate immune receptors, such as toll-like receptor 3 (TLR3), melanoma differentiation-associated 5 (MDA5) and retinoic acid-inducible gene-I (RIG-I), have been shown to be differentially expressed in neuroblastoma (NB) and promote dsRNA poly (I:C)-induced NB suppression in vitro and in vivo. However, the role of another important innate immune cytosolic sensor, laboratory of genetics and physiology 2 (LGP2), in the cancer behavior of NB remains unclear. Here, we demonstrated that the expression levels of LGP2 were either low or undetectable in all NB cell lines tested with or without MYCN amplification. LGP2 expression levels were significantly increased only in NB cells without MYCN amplification, including SK-N-AS and SK-N-FI after poly (I:C) treatment in vitro and in mouse xenograft models. Ectopic expression of LGP2 in NB cells significantly enhanced poly (I:C)-induced NB cell death associated with downregulation of MDA5, RIG-I, MAVS and Bcl-2, as well as upregulation of Noxa and tBid. By immunofluorescence analyses, LGP2 localized mainly in the cytoplasm of NB cells after poly (I:C) treatment. In human NB tissue samples, cytoplasmic LGP2 expression was positively correlated with histological differentiation and inversely correlated with MYCN amplification. Positive cytoplasmic LGP2 expression in tumor tissues could predict a favorable outcome in NB patients independent of other prognostic factors. In short, LGP2 was effective in promoting poly (I:C)-induced NB suppression and cytoplasmic LGP2 can serve as an independent favorable prognostic factor in NB patients.
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Affiliation(s)
- Li-Ling Lin
- Department of Pediatric Surgery, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Chao-Cheng Huang
- Biobank and Tissue Bank and Department of Pathology, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan.,Chang Gung University College of Medicine, Tao-Yuan, Taiwan
| | - Min-Tsui Wu
- Department of Pediatric Surgery, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Wen-Ming Hsu
- Department of Surgery, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan
| | - Jiin-Haur Chuang
- Department of Pediatric Surgery, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
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11
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Combinatorial treatment with polyI:C and anti-IL6 enhances apoptosis and suppresses metastasis of lung cancer cells. Oncotarget 2018; 8:32884-32904. [PMID: 28427199 PMCID: PMC5464836 DOI: 10.18632/oncotarget.15862] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 02/07/2017] [Indexed: 12/15/2022] Open
Abstract
Activation of TLR3 stimulates cancer cell apoptosis and triggers secretion of inflammatory cytokines. PolyI:C, a TLR3 agonist, activates immune cells and regresses metastatic lung cancer in vivo. Although polyI:C reportedly kills lung carcinomas, the mechanism remains elusive. Here, we demonstrated that polyI:C suppressed the proliferation and survival of metastatic (NCI-H358 and NCI-H292) and non-metastatic (A549) lung cancer cells. Notably, A549, NCI-H292 and NCI-H358 which are inducible by polyI:C, expressed low-to-medium level of TLR3 protein, and were susceptible to polyI:C treatment. By contrast, NCI-H1299, which endogenously expresses high level of TLR3 protein, was insensitive to polyI:C. We showed that polyI:C stimulated pro-inflammatory cytokines associated with survival and metastasis in a cell type-specific manner. While A549 and NCI-H292 released high levels of IL6, IL8 and GRO, the NCI-H358 cells endogenously secretes abundant levels of these cytokines, and was not further induced by polyI:C. Thus, NCI-H358 was resistant to the inhibition of cytokine-dependent metastasis. NCI-H1299, which was unresponsive to polyI:C, did not produce any of the pro-inflammatory cytokines. Treatment of A549 with a combination of polyI:C and anti-IL6 antibody significantly decreased IL6 production, and enhanced polyI:C-mediated killing and suppression of oncogenicity and metastasis. While polyI:C stimulated the phosphorylation of STAT3 and JAK2, blockade of these proteins enhanced polyI:C-mediated suppression of survival and metastasis. Taken together, polyI:C alone provoked apoptosis of lung cancer cells that express low-to-medium levels of functional TLR3 protein. The combinatorial treatment with polyI:C and anti-IL6 enhanced polyI:C-mediated anticancer activities through IL6/JAK2/STAT3 signalling, and apoptosis via TLR3-mediated caspase 3/8 pathway.
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12
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Veyrat M, Durand S, Classe M, Glavan TM, Oker N, Kapetanakis NI, Jiang X, Gelin A, Herman P, Casiraghi O, Zagzag D, Enot D, Busson P, Vérillaud B. Stimulation of the toll-like receptor 3 promotes metabolic reprogramming in head and neck carcinoma cells. Oncotarget 2018; 7:82580-82593. [PMID: 27791989 PMCID: PMC5347715 DOI: 10.18632/oncotarget.12892] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Accepted: 10/19/2016] [Indexed: 12/31/2022] Open
Abstract
In this study, a possible link between the innate immune recognition receptor TLR3 and metabolic reprogramming in Head and Neck carcinoma (HNC) cells was investigated. The effects of TLR3 stimulation/knock-down were assessed under several culture conditions in 4 HNC cell-lines by cell growth assays, targeted metabolomics, and glycolysis assays based on time-resolved analysis of proton release (Seahorse analyzer). The stimulation of TLR3 by its synthetic agonist Poly(A:U) resulted in a faster growth of HNC cells under low foetal calf serum conditions. Targeted analysis of glucose metabolism pathways demonstrated a tendency towards a shift from tricarboxylic acid cycle (Krebs cycle) to glycolysis and anabolic reactions in cells treated with Poly(A:U). Glycolysis assays confirmed that TLR3 stimulation enhanced the capacity of malignant cells to switch from oxidative phosphorylation to extra-mitochondrial glycolysis. We found evidence that HIF-1α is involved in this process: addition of the TLR3 agonist resulted in a higher cell concentration of the HIF-1α protein, even in normoxia, whereas knocking-down TLR3 resulted in a lower concentration, even in hypoxia. Finally, we assessed TLR3 expression by immunohistochemistry in a series of 7 HNSCC specimens and found that TLR3 was detected at higher levels in tumors displaying a hypoxic staining pattern. Overall, our results demonstrate that TLR3 stimulation induces the Warburg effect in HNC cells in vitro, and suggest that TLR3 may play a role in tumor adaptation to hypoxia.
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Affiliation(s)
- Mathieu Veyrat
- University Paris-Sud (Paris 11), CNRS-UMR 8126, Gustave Roussy, Villejuif, France
| | - Sylvère Durand
- Equipe 11 Labélisée par la Ligue Nationale Contre le Cancer, INSERM U1138, Centre de Recherche des Cordeliers, Paris, France.,Metabolomics and Molecular Cell Biology Platforms, Gustave Roussy, Villejuif, France
| | - Marion Classe
- Department of Pathology, Lariboisière Hospital, AP-HP, University Paris-Diderot Paris 7, Paris, France
| | | | - Natalie Oker
- University Paris-Sud (Paris 11), CNRS-UMR 8126, Gustave Roussy, Villejuif, France.,Department of Head and Neck surgery, Lariboisière Hospital, AP-HP, University Paris-Diderot Paris 7, Paris, France
| | | | - Xiaojun Jiang
- University Paris-Sud (Paris 11), CNRS-UMR 8126, Gustave Roussy, Villejuif, France
| | - Aurore Gelin
- University Paris-Sud (Paris 11), CNRS-UMR 8126, Gustave Roussy, Villejuif, France
| | - Philippe Herman
- Department of Head and Neck surgery, Lariboisière Hospital, AP-HP, University Paris-Diderot Paris 7, Paris, France
| | - Odile Casiraghi
- Department of Biopathology, Gustave Roussy, Villejuif, France
| | - David Zagzag
- Department of Neuropathology, New York University School of Medicine, New York, NY, USA
| | - David Enot
- Equipe 11 Labélisée par la Ligue Nationale Contre le Cancer, INSERM U1138, Centre de Recherche des Cordeliers, Paris, France.,Metabolomics and Molecular Cell Biology Platforms, Gustave Roussy, Villejuif, France
| | - Pierre Busson
- University Paris-Sud (Paris 11), CNRS-UMR 8126, Gustave Roussy, Villejuif, France
| | - Benjamin Vérillaud
- University Paris-Sud (Paris 11), CNRS-UMR 8126, Gustave Roussy, Villejuif, France.,Department of Head and Neck surgery, Lariboisière Hospital, AP-HP, University Paris-Diderot Paris 7, Paris, France
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13
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Zhou X, Chang Y, Zhan Y, Wang X, Lin K. Integrative mRNA-miRNA interaction analysis associate with immune response of sea cucumber Apostichopus japonicus based on transcriptome database. FISH & SHELLFISH IMMUNOLOGY 2018; 72:69-76. [PMID: 29054825 DOI: 10.1016/j.fsi.2017.10.031] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2017] [Revised: 10/13/2017] [Accepted: 10/16/2017] [Indexed: 06/07/2023]
Abstract
MicroRNAs (miRNAs) constitute a family of endogenous non-coding small RNAs that have been demonstrated to be the key effectors in mediating host-pathogen interactions. Additionally, high-throughput sequencing provides unexampled opportunities to identify the pathogenic mechanism underlying miRNAs. In the present study, the target genes of immune-related miRNAs (miR-31, miR-2008, miR-92a, miR-210 and miR-7) and specific miRNAs (miR-2004) in Echinodermata were predicted in silico and validated. Gene ontology (GO) analysis of the target genes of these six miRNAs were conducted to further understand the regulatory function in the host immunity of Apostichopus japonicus (A. japonicus). Among the putative target genes of the six miRNAs, various immune-related targets were annotated, such as Nephl, SEC14Ll, p105, GL2, LYS, FNIAL, mTOR, LITAF, SLC44, TLR3, Apaf-1, and CNTN4. This work will provide valuable genetic resources to understand the interaction of multiple mRNA-miRNAs and the regulation mechanism in the anti-bacterial process in the sea cucumber.
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Affiliation(s)
- Xiaoxu Zhou
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture, Dalian Ocean University, Dalian, 116023, China
| | - Yaqing Chang
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture, Dalian Ocean University, Dalian, 116023, China.
| | - Yaoyao Zhan
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture, Dalian Ocean University, Dalian, 116023, China
| | - Xiuli Wang
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture, Dalian Ocean University, Dalian, 116023, China
| | - Kai Lin
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture, Dalian Ocean University, Dalian, 116023, China
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14
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PD-L1, inflammation, non-coding RNAs, and neuroblastoma: Immuno-oncology perspective. Semin Cancer Biol 2017; 52:53-65. [PMID: 29196189 DOI: 10.1016/j.semcancer.2017.11.009] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 11/11/2017] [Accepted: 11/16/2017] [Indexed: 12/21/2022]
Abstract
Neuroblastoma is the most common pediatric solid tumor of neural crest origin. The current treatment options for neuroblastoma produce severe side effects. Programmed death-ligand 1 (PD-L1), chronic inflammation, and non-coding RNAs are known to play a significant role in the pathogenesis of neuroblastoma. Cancer cells and the surrounding cells in the tumor microenvironment express PD-L1. Programmed death-1 (PD-1) is a co-receptor expressed predominantly by T cells. The binding of PD-1 to its ligands, PD-L1 or PD-L2, is vital for the physiologic regulation of the immune system. Chronic inflammation is involved in the recruitment of leukocytes, production of cytokines and chemokines that in turn, lead to survival, metastasis, and angiogenesis in neuroblastoma tumors. The miRNAs and long non-coding (lnc) RNAs have emerged as a novel class of non-coding RNAs that can regulate neuroblastoma associated cell-signaling pathways. The dysregulation of PD-1/PD-L1, inflammatory pathways, lncRNAs, and miRNAs have been reported in clinical and experimental samples of neuroblastoma. These signaling molecules are currently being evaluated for their potential as the biomarker and therapeutic targets in the management of neuroblastoma. A monoclonal antibody called dinutuximab (Unituxin) that attaches to a carbohydrate molecule GD2, on the surface of many neuroblastoma cells, is being used as an immunotherapy drug for neuroblastoma treatment. Atezolizumab (Tecentriq), an engineered monoclonal antibody against PD-L1, are currently in clinical trial for neuroblastoma patients. The lncRNA/miRNA-based therapeutics is being developed to deliver tumor suppressor lncRNAs/miRNAs or silencing of oncogenic lncRNAs/miRNAs. The focus of this review is to discuss the current knowledge on the immune checkpoint molecules, PD-1/PD-L1 signaling, inflammation, and non-coding RNAs in neuroblastoma.
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15
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Bianchi F, Pretto S, Tagliabue E, Balsari A, Sfondrini L. Exploiting poly(I:C) to induce cancer cell apoptosis. Cancer Biol Ther 2017; 18:747-756. [PMID: 28881163 PMCID: PMC5678690 DOI: 10.1080/15384047.2017.1373220] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
TLR3 belong to the Toll-like receptors family, it is mainly expressed on immune cells where it senses pathogen-associated molecular patterns and initiates innate immune response. TLR3 agonist poly(I:C) was developed to mimic pathogens infection and boost immune system activation to promote anti-cancer therapy. Accordingly, TLR agonists were included in the National Cancer Institute list of immunotherapeutic agents with the highest potential to cure cancer. Besides well known effects on immune cells, poly(I:C) was also shown, in experimental models, to directly induce apoptosis in cancer cells expressing TLR3. This review presents the current knowledge on the mechanism of poly(I:C)-induced apoptosis in cancer cells. Experimental evidences on positive or negative regulators of TLR3-mediated apoptosis induced by poly(I:C) are reported and strategies are proposed to successfully promote this event in cancer cells. Cancer cells apoptosis is an additional arm offered by poly(I:C), besides activation of immune system, for the treatment of various type of cancer. A further dissection of TLR3 signaling would contribute to greater resolution of the critical steps that impede full exploitation of the poly(I:C)-induced apoptosis. Experimental evidences about negative regulator of poly(I:C)-induced apoptotic program should be considered in combinations with TLR3 agonists in clinical trials.
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Affiliation(s)
- Francesca Bianchi
- a Fondazione IRCCS Istituto Nazionale dei Tumori , Department of Research, Epidemiologia e Medicina Molecolare , via Amadeo 42, Milan , Italy.,b Università degli Studi di Milano , Dipartimento di Scienze Biomediche per la Salute , via Mangiagalli 31, Milan , Italy
| | - Samantha Pretto
- b Università degli Studi di Milano , Dipartimento di Scienze Biomediche per la Salute , via Mangiagalli 31, Milan , Italy
| | - Elda Tagliabue
- a Fondazione IRCCS Istituto Nazionale dei Tumori , Department of Research, Epidemiologia e Medicina Molecolare , via Amadeo 42, Milan , Italy
| | - Andrea Balsari
- a Fondazione IRCCS Istituto Nazionale dei Tumori , Department of Research, Epidemiologia e Medicina Molecolare , via Amadeo 42, Milan , Italy.,b Università degli Studi di Milano , Dipartimento di Scienze Biomediche per la Salute , via Mangiagalli 31, Milan , Italy
| | - Lucia Sfondrini
- b Università degli Studi di Milano , Dipartimento di Scienze Biomediche per la Salute , via Mangiagalli 31, Milan , Italy
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16
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Double-Stranded RNA Interacts With Toll-Like Receptor 3 in Driving the Acute Inflammatory Response Following Lung Contusion. Crit Care Med 2017; 44:e1054-e1066. [PMID: 27509390 DOI: 10.1097/ccm.0000000000001879] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
OBJECTIVES Lung contusion is a major risk factor for the development of acute respiratory distress syndrome. We set to determine the role of toll-like receptor 3 and the binding of double-stranded RNA in the pathogenesis of sterile injury following lung contusion. DESIGN Toll-like receptor 3 expression was analyzed in postmortem lung samples from patients with lung contusion. Unilateral lung contusion was induced in toll-like receptor 3 (-/-), TIR-domain-containing adapter-inducing interferon-β (-/-), and wild-type mice. Subsequently, lung injury and inflammation were evaluated. Apoptotic indices, phagocytic activity, and phenotypic characterization of the macrophages were determined. Double-stranded RNA in bronchoalveolar lavage and serum samples following lung contusion was measured. A toll-like receptor 3/double-stranded RNA ligand inhibitor was injected into wild-type mice prior to lung contusion. MEASUREMENTS AND MAIN RESULTS Toll-like receptor 3 expression was higher in patients and wild-type mice with lung contusion. The degree of lung injury, inflammation, and macrophage apoptosis was reduced in toll-like receptor 3 (-/-), TIR-domain-containing adapter-inducing interferon-β (-/-), and wild-type mice with toll-like receptor 3 antibody neutralization. Alveolar macrophages from toll-like receptor 3 (-/-) mice had a lower early apoptotic index, a predominant M2 phenotype and increased surface translocation of toll-like receptor 3 from the endosome to the surface. When compared with viral activation pathways, lung injury in lung contusion demonstrated increased p38 mitogen-activated protein kinases, extracellular signal-regulated kinase 1/2 phosphorylation with inflammasome activation without a corresponding increase in nuclear factor-κB or type-1 interferon production. Additionally, pretreatment with toll-like receptor 3/double-stranded RNA ligand inhibitor led to a reduction in injury, inflammation, and macrophage apoptosis. CONCLUSIONS We conclude that the interaction of double-stranded RNA from injured cells with toll-like receptor 3 drives the acute inflammatory response following lung contusion.
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17
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Lin LL, Huang CC, Wu CL, Wu MT, Hsu WM, Chuang JH. Downregulation of c-Myc is involved in TLR3-mediated tumor death of neuroblastoma xenografts. J Transl Med 2016; 96:719-30. [PMID: 27183205 DOI: 10.1038/labinvest.2016.57] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Revised: 03/29/2016] [Accepted: 03/31/2016] [Indexed: 12/20/2022] Open
Abstract
Neuroblastoma (NB) is the deadliest pediatric solid tumor due to its pleomorphic molecular characteristics. In the innate immune system, toll-like receptor 3 (TLR3) recognizes viral double-stranded RNAs to initiate immune signaling. Positive TLR3 expression indicates a favorable prognosis in NB patients, and is associated with MYCN-non-amplified. However, TLR3-mediated innate immune responses remain elusive in NB. In this study, we attempted to dissect the molecular mechanism underlying TLR3-agonist polyinosinic-polycytidylic acid [poly(I:C)] treatment in NB in vivo. We established NB xenograft models in non-obese diabetic/severe combined immunodeficiency (NOD/SCID) mice with MYCN-amplified SK-N-DZ (DZ) cells or MYCN-non-amplified SK-N-AS (AS) cells. Poly(I:C) treatment led to significant tumor regression in AS xenografts, but not in DZ xenografts. Through immunohistochemical analysis, significant suppression of tumor proliferation, downregulation of c-Myc expression, and upregulation of TLR3 expression were found in the treatment group. Poly(I:C) inducing activation of TLR3/IRF3-mediated innate immunity associated with downregulation of c-Myc can be found in MYCN-non-amplified SK-N-AS cells, but not in MYCN-amplified BE(2)-M17 cells. Knockdown of TLR3 disturbed poly(I:C)-induced suppression of c-Myc and upregulation of p-IRF3 in AS cells. Furthermore, poly(I:C) treatment upregulated active NF-κB, mitochondrial antioxidant manganese superoxide dismutase and 8-hydroxydeoxyguanosine, which works with reactive oxygen species (ROS) generation and DNA damage. Upregulation of active caspase 3 and cleaved poly [ADP-ribose] polymerase 1 were found in poly(I:C)-treated AS xenografts, which indicates the induction of apoptosis. Thus, our results suggest that c-Myc overexpression may increase sensitivity to poly(I:C)-induced tumor growth arrest and ROS-mediated apoptosis in NB. This study demonstrates that c-Myc protein expression has an important role in TLR3-induced innate immune responses, providing future treatment recommendations.
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Affiliation(s)
- Li-Ling Lin
- Department of Pediatric Surgery, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan.,Department of Medical Research, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Chao-Cheng Huang
- Biobank and Tissue Bank, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan.,Department of Pathology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Chia-Ling Wu
- Department of Pediatric Surgery, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Min-Tsui Wu
- Department of Pediatric Surgery, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Wen-Ming Hsu
- Department of Surgery, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan
| | - Jiin-Haur Chuang
- Department of Pediatric Surgery, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
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18
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N-Myc expression enhances the oncolytic effects of vesicular stomatitis virus in human neuroblastoma cells. MOLECULAR THERAPY-ONCOLYTICS 2016; 3:16005. [PMID: 27626059 PMCID: PMC5008254 DOI: 10.1038/mto.2016.5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Revised: 01/22/2016] [Accepted: 01/25/2016] [Indexed: 02/07/2023]
Abstract
N-myc oncogene amplification is associated but not present in all cases of high-risk neuroblastoma (NB). Since oncogene expression could often modulate sensitivity to oncolytic viruses, we wanted to examine if N-myc expression status would determine virotherapy efficacy to high-risk NB. We showed that induction of exogenous N-myc in a non-N-myc-amplified cell line background (TET-21N) increased susceptibility to oncolytic vesicular stomatitis virus (mutant VSVΔM51) and alleviated the type I IFN-induced antiviral state. Cells with basal N-myc, on the other hand, were less susceptible to virus-induced oncolysis and established a robust IFN-mediated antiviral state. The same effects were also observed in NB cell lines with and without N-myc amplification. Microarray analysis showed that N-myc overexpression in TET-21N cells downregulated IFN-stimulated genes (ISGs) with known antiviral functions. Furthermore, virus infection caused significant changes in global gene expression in TET-21N cells overexpressing N-myc. Such changes involved ISGs with various functions. Therefore, the present study showed that augmented susceptibility to VSVΔM51 by N-myc at least involves downregulation of ISGs with antiviral functions and alleviation of the IFN-stimulated antiviral state. Our studies suggest the potential utility of N-myc amplification/overexpression as a predictive biomarker of virotherapy response for high-risk NB using IFN-sensitive oncolytic viruses.
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Hsu WM, Huang CC, Lee HY, Wu PY, Wu MT, Chuang HC, Lin LL, Chuang JH. MDA5 complements TLR3 in suppression of neuroblastoma. Oncotarget 2015; 6:24935-46. [PMID: 26208481 PMCID: PMC4694805 DOI: 10.18632/oncotarget.4511] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Accepted: 06/26/2015] [Indexed: 12/28/2022] Open
Abstract
Toll-like receptor3 (TLR3) has been confirmed to be differentially expressed in neuroblastoma (NB), and predicts a favorable prognosis with a high expression in tumor tissues. Treatment with TLR3 agonist--polyinosinic-polycytidylic acid [poly(I:C)] could induce significant but limited apoptosis in TLR3-expressing NB cells, suggesting that other viral RNA sensors, including melanoma differentiation-associated gene 5 (MDA5) and retinoic acid-inducible gene-I (RIG-I) in the cytosolic compartment might also be implicated in poly(I:C)-induced NB cell death. MDA5 and RIG-I were induced by poly(I:C) to express in two of six NB cell lines, SK-N-AS (AS) and SK-N-FI, which were associated with up-regulation of caspase9 and active caspase3. While knockdown of either MDA5 or RIG-I alone is ineffective to decrease caspase9 and active caspase3, simultaneously targeting MDA5 and TLR3 showed the best effect to rescue poly(I:C) induced up-regulation of mitochondrial antiviral signaling protein (MAVS), caspase9, active caspase3, and apoptosis in AS cells. Over-expression of MDA5 in FaDu cells resulted in significantly less colony formation and more poly(I:C)-induced cell death. Further studies in human NB tissue samples revealed that MDA5 expression in NB tissues predicted a favorable prognosis synergistically with TLR3. Our findings indicate that MDA5 may serve as a complementary role in the TLR3 activated suppression of NB.
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Affiliation(s)
- Wen-Ming Hsu
- Department of Surgery, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan
| | - Chao-Cheng Huang
- Department of Pathology, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Hsin-Yu Lee
- Department of Life Science and Institute of Zoology, National Taiwan University, Taipei, Taiwan
| | - Pei-Yi Wu
- Department of Life Science and Institute of Zoology, National Taiwan University, Taipei, Taiwan
| | - Min-Tsui Wu
- Department of Pediatric Surgery, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Hui-Ching Chuang
- Department of Otolaryngology, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Li-Ling Lin
- Department of Pediatric Surgery, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
- Department of Medical Research, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Jiin-Haur Chuang
- Department of Pediatric Surgery, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
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20
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Boes M, Meyer-Wentrup F. TLR3 triggering regulates PD-L1 (CD274) expression in human neuroblastoma cells. Cancer Lett 2015; 361:49-56. [PMID: 25697485 DOI: 10.1016/j.canlet.2015.02.027] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Revised: 02/11/2015] [Accepted: 02/12/2015] [Indexed: 12/22/2022]
Abstract
Neuroblastoma is the most common extracranial solid tumor in children, causing 12% of all pediatric cancer mortality. Neuroblastoma specific T-cells have been detected in patients, but usually fail to attack and eradicate the tumors. Tumor immune evasion may thus play an important role in neuroblastoma pathogenicity. Recent research in adult cancer patients shows that targeting T-cell check-point molecules PD-1/PD-L1 (or CD279/CD274) may bolster immune reactivity against solid tumors. Also, infections can be associated with spontaneous neuroblastoma regression. In our current study, we therefore investigated if antibody targeting of PD-L1 and triggering of selective pathogen-receptor Toll-like receptors (TLRs) potentiates immunogenicity of neuroblastoma cells. We find this to be the case. TLR3 triggering induced strong upregulation of both MHC class I and PD-L1 on neuroblastoma cells. At the same time TGF-β levels decreased and IL-8 secretion was induced. The combined neuroblastoma cell treatment using PD-L1 blockade and TLR3 triggering using virus analog poly(I:C) moreover induced CD4(+) and CD8(+) T-cell activation. Thus, we propose combined treatment using PD-L1 blockade with synthetic TLR ligands as an avenue toward new immunotherapy against human neuroblastoma.
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Affiliation(s)
- Marianne Boes
- Department of Pediatric Immunology, Laboratory of Translational Immunology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Friederike Meyer-Wentrup
- Department of Pediatric Immunology, Laboratory of Translational Immunology, University Medical Center Utrecht, Utrecht, The Netherlands; Princess Máxima Center for Pediatric Oncology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, The Netherlands.
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The novel kinase inhibitor EMD1214063 is effective against neuroblastoma. Invest New Drugs 2014; 32:815-24. [PMID: 24832869 DOI: 10.1007/s10637-014-0107-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 04/23/2014] [Indexed: 12/16/2022]
Abstract
BACKGROUND Children with high-risk neuroblastoma have poor survival rates, and novel therapies are needed. Previous studies have identified a role for the HGF/c-Met pathway in neuroblastoma pathogenesis. We hypothesized that EMD1214063 would be effective against neuroblastoma tumor cells and tumors in preclinical models via inhibition of HGF/c-Met signaling. Methods We determined the expression of c-Met protein by Western blots in a panel of neuroblastoma tumor cell lines and neuroblastoma cell viability after treatment with EMD1214063 using MTT assays. TUNEL assays and assays for DNA ladder formation, were performed to measure the induction of apoptosis after EMD1214063 treatment. Inhibition of intracellular signaling was measured by Western blot analysis of treated and untreated cells. To investigate the efficacy of EMD1214063 against neuroblastoma tumors in vivo, neuroblastoma cells were injected orthotopically into immunocompromised mice, and mice were treated with oral EMD1214063. Tumors were evaluated for growth, histologic appearance, and induction of apoptosis by immunohistochemistry. Results All neuroblastoma cell lines were sensitive to EMD1214063, and IC50 values ranged from 2.4 to 8.5 μM. EMD1214063 treatment inhibited HGF-mediated c-Met phosphorylation and MEK phosphorylation in neuroblastoma cells. EMD1214063 induced apoptosis in all tested cell lines. In mice with neuroblastoma xenograft tumors, EMD1214063 treatment reduced tumor growth. Conclusions Treatment of neuroblastoma tumor cells with EMD1214063 inhibits HGF-induced c-Met phosphorylation and results in cell death. EMD1214063 treatment is also effective in reducing tumor growth in vivo. EMD1214063 therefore represents a novel therapeutic agent for neuroblastoma, and further preclinical studies of EMD1214063 are warranted.
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Hoyo-Becerra C, Huebener A, Trippler M, Lutterbeck M, Liu ZJ, Truebner K, Bajanowski T, Gerken G, Hermann DM, Schlaak JF. Concomitant interferon alpha stimulation and TLR3 activation induces neuronal expression of depression-related genes that are elevated in the brain of suicidal persons. PLoS One 2013; 8:e83149. [PMID: 24391741 PMCID: PMC3877033 DOI: 10.1371/journal.pone.0083149] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Accepted: 10/30/2013] [Indexed: 02/07/2023] Open
Abstract
We have previously identified 15 genes that are associated with the development of severe depressive side effects during the standard therapy with interferon alpha and ribavirin in the peripheral blood of hepatitis C virus infected patients. An enhanced expression of these genes was also found in the blood of psychiatric patients suffering severe depressive episode. Herein, we demonstrate that the same depression-related interferon-inducible genes (DRIIs) are also upregulated in post-mortem brains of suicidal individuals. Using cultured mouse hippocampal and prefrontal neurons we show that costimulation with murine IFN (mIFN) and the TLR3 agonist poly(I:C) promotes the expression of the described DRIIs, at the same time inducing pro-inflammatory cytokine expression through Stat1 and Stat3 activation, promoting neuronal apoptosis. Consequently, the upregulation of selective DRIIs, production of inflammatory cytokines and inhibition of neuronal plasticity may be involved in the pathogenesis of IFN-associated depression.
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Affiliation(s)
- Carolina Hoyo-Becerra
- Department of Gastroenterology and Hepatology, University Hospital of Essen, Essen, Germany
| | - Anastasia Huebener
- Department of Gastroenterology and Hepatology, University Hospital of Essen, Essen, Germany
| | - Martin Trippler
- Department of Gastroenterology and Hepatology, University Hospital of Essen, Essen, Germany
| | - Melanie Lutterbeck
- Department of Gastroenterology and Hepatology, University Hospital of Essen, Essen, Germany
| | - Zijian J. Liu
- Department of Anatomy, Tongji Medical College of Huazhong, University of Science and Technology, Wuhan City, P.R.China
| | - Kurt Truebner
- Institute for Forensic Medicine, University Hospital of Essen, Essen, Germany
| | - Thomas Bajanowski
- Institute for Forensic Medicine, University Hospital of Essen, Essen, Germany
| | - Guido Gerken
- Department of Gastroenterology and Hepatology, University Hospital of Essen, Essen, Germany
| | - Dirk M. Hermann
- Department of Neurology, University Hospital of Essen, Essen, Germany
| | - Joerg F. Schlaak
- Department of Gastroenterology and Hepatology, University Hospital of Essen, Essen, Germany
- * E-mail:
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Chen S, Yan H, Sun B, Zuo A, Liang D. Subretinal transfection of chitosan-loaded TLR3-siRNA for the treatment of experimental autoimmune uveitis. Eur J Pharm Biopharm 2013; 85:726-35. [DOI: 10.1016/j.ejpb.2013.09.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Revised: 09/05/2013] [Accepted: 09/10/2013] [Indexed: 01/01/2023]
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Mohan N, Chakrabarti M, Banik NL, Ray SK. Combination of LC3 shRNA plasmid transfection and genistein treatment inhibited autophagy and increased apoptosis in malignant neuroblastoma in cell culture and animal models. PLoS One 2013; 8:e78958. [PMID: 24205354 PMCID: PMC3800129 DOI: 10.1371/journal.pone.0078958] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Accepted: 09/17/2013] [Indexed: 11/25/2022] Open
Abstract
Malignant neuroblastoma is an extracranial solid tumor that usually occurs in children. Autophagy, which is a survival mechanism in many solid tumors including malignant neuroblastoma, deters the efficacy of conventional chemotherapeutic agents. To mimic starvation, we used 200 nM rapamycin that induced autophagy in human malignant neuroblastoma SK-N-BE2 and IMR-32 cells in cell culture and animal models. Combination of microtubule associated protein light chain 3 short hairpin RNA (LC3 shRNA) plasmid transfection and genistein (GST) treatment was tested for inhibiting rapamycin-induced autophagy and promoting apoptosis. The best synergistic efficacy caused the highest decrease in cell viability due to combination of 50 nM LC3 shRNA plasmid transfection and 25 µM GST treatment in rapamycin-treated SK-N-BE2 cells while combination of 100 nM LC3 shRNA plasmid transfection and 25 µM GST treatment in rapamycin-treated IMR-32 cells. Quantitation of acidic vesicular organelles confirmed that combination of LC3 shRNA plasmid transfection and GST treatment prevented rapamycin-induced autophagy due to down regulation of autophagy promoting marker molecules (LC3 II, Beclin 1, TLR-4, and Myd88) and upregulation of autophagy inhibiting marker molecules (p62 and mTOR) in both cell lines. Apoptosis assays showed that combination therapy most effectively activated mitochondrial pathway of apoptosis in human malignant neuroblastoma in cell culture and animal models. Collectively, our current combination of LC3 shRNA plasmid transfection and GST treatment could serve as a promising therapeutic strategy for inhibiting autophagy and increasing apoptosis in human malignant neuroblastoma in cell culture and animal models.
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Affiliation(s)
- Nishant Mohan
- Department of Pathology, Microbiology, and Immunology, University of South Carolina School of Medicine, Columbia, South Carolina, United States of America
| | - Mrinmay Chakrabarti
- Department of Pathology, Microbiology, and Immunology, University of South Carolina School of Medicine, Columbia, South Carolina, United States of America
| | - Naren L. Banik
- Department of Neurosciences, Medical University of South Carolina, Charleston, South Carolina, United States of America
| | - Swapan K. Ray
- Department of Pathology, Microbiology, and Immunology, University of South Carolina School of Medicine, Columbia, South Carolina, United States of America
- * E-mail:
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Toll-like receptor 3 expression inhibits cell invasion and migration and predicts a favorable prognosis in neuroblastoma. Cancer Lett 2013; 336:338-46. [PMID: 23541683 DOI: 10.1016/j.canlet.2013.03.024] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2013] [Revised: 03/17/2013] [Accepted: 03/20/2013] [Indexed: 12/20/2022]
Abstract
To evaluate the clinical significance of TLR3 expression on neuroblastomas, we performed immunohistochemical study on archival tissues and in vitro studies on neuroblastoma cell lines. The results showed that positive TLR3 expression was associated with favorable histology and prognosis. Activation of TLR3 by polyinosinic:polycytidylic acid [poly(I:C)] treatment is effective to suppress cell migration and invasion and to decrease organized assembly of F-actin and filopodia formation, in TLR3-expressing SK-N-AS cells, which could be reversed by TLR3-targeting siRNA treatment. TLR3 agonist poly(I:C) promotes GAP-43 expression also in SK-N-AS cells only. Taken together, TLR3 could serve to predict favorable behavior in neuroblastomas.
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Synergy between RA and TLR3 promotes type I IFN-dependent apoptosis through upregulation of TRAIL pathway in breast cancer cells. Cell Death Dis 2013; 4:e479. [PMID: 23370279 PMCID: PMC3564005 DOI: 10.1038/cddis.2013.5] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Due to its ability to regulate the growth, differentiation and apoptosis of cancer cells, retinoic acid (RA) is considered a signaling molecule with promising therapeutic potential in oncology. In this study, we show that RA is able to induce the intrinsic ability of breast cancer cells to recognize double-stranded RNA (dsRNA) through the upregulation of Toll-like receptor 3 (TLR3) expression. RA, co-administered with the dsRNA mimicker polyinosinic–polycytidylic acid (poly(I:C)), synergizes to mount a specific response program able to sense dsRNA through the concurrent upregulation of TLR3, the dsRNA helicases melanoma differentiation-associated antigen-5 (MDA-5) and RA-inducible gene-1 (RIG-1), and the dsRNA-activated protein kinase (PKR) expression, leading breast cancer cells to specifically express downstream transcriptional targets of dsRNA sensors, such as interferon-β (IFNβ), interleukin-8 (IL-8), chemokine (C-C motif) ligand 5 (CCL5), and C-X-C motif Chemokine 10 (CXCL10). A TLR3-dependent apoptotic program is also induced by RA and poly(I:C) co-treatment that correlates with the induction of the tumor necrosis factor (TNF)-related apoptosis-inducing ligand (TRAIL) and contributes to block breast cancer cell proliferation. The mechanisms of apoptosis induced by RA/poly(I:C) in breast cancer cells involve type I IFN autocrine signaling, caspase-8 and caspase-3 activation, as well as TRAIL signaling. Our results reveal important links among RA, TLR3 and TRAIL and highlight the combined use of RA and poly(I:C) as a potential effective tumor therapy by improving the apoptotic response of cancer cells with low sensitivity to the action of synthetic dsRNA.
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Vérillaud B, Gressette M, Morel Y, Paturel C, Herman P, Lo KW, Tsao SW, Wassef M, Jimenez-Pailhes AS, Busson P. Toll-like receptor 3 in Epstein-Barr virus-associated nasopharyngeal carcinomas: consistent expression and cytotoxic effects of its synthetic ligand poly(A:U) combined to a Smac-mimetic. Infect Agent Cancer 2012. [PMID: 23198710 PMCID: PMC3599303 DOI: 10.1186/1750-9378-7-36] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Background Nasopharyngeal carcinomas (NPC) are consistently associated with the Epstein-Barr virus (EBV). Though NPCs are more radiosensitive and chemosensitive than other tumors of the upper aero-digestive tract, many therapeutic challenges remain. In a previous report, we have presented data supporting a possible therapeutic strategy based on artificial TLR3 stimulation combined to the inhibition of the IAP protein family (Inhibitor of Apoptosis Proteins). The present study was designed to progress towards practical applications of this strategy pursuing 2 main objectives: 1) to formally demonstrate expression of the TLR3 protein by malignant NPC cells; 2) to investigate the effect of poly(A:U) as a novel TLR3-agonist more specific than poly(I:C) which was used in our previous study. Methods TLR3 expression was investigated in a series of NPC cell lines and clinical specimens by Western blot analysis and immunohistochemistry, respectively. The effects on NPC cells growth of the TLR3 ligand poly(A:U) used either alone or in combination with RMT5265, an IAP inhibitor based on Smac-mimicry, were assessed using MTT assays and clonogenic assays. Results TLR3 was detected at a high level in all NPC cell lines and clinical specimens. Low concentrations of poly(A:U) were applied to several types of NPC cells including cells from the C17 xenograft which for the first time have been adapted to permanent propagation in vitro. As a single agent, poly(A:U) had no significant effects on cell growth and cell survival. In contrast, dramatic effects were obtained when it was combined with the IAP inhibitor RMT5265. These effects were obtained using concentrations as low as 0.5 μg/ml (poly(A:U)) and 50 nM (RMT5265). Conclusion These data confirm that TLR3 expression is a factor of vulnerability for NPC cells. They suggest that in some specific pathological and pharmacological contexts, it might be worth to use Smac-mimetics at very low doses, allowing a better management of secondary effects. In light of our observations, combined use of both types of compounds should be considered for treatment of nasopharyngeal carcinomas.
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Affiliation(s)
- Benjamin Vérillaud
- CNRS-UMR 8126, Institut de Cancérologie Gustave Roussy, University Paris-Sud 11, 39 rue Camille Desmoulins, 94805, Villejuif cedex, France.
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Basith S, Manavalan B, Yoo TH, Kim SG, Choi S. Roles of toll-like receptors in cancer: a double-edged sword for defense and offense. Arch Pharm Res 2012; 35:1297-316. [PMID: 22941474 DOI: 10.1007/s12272-012-0802-7] [Citation(s) in RCA: 143] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Revised: 06/21/2012] [Accepted: 06/25/2012] [Indexed: 12/18/2022]
Abstract
Toll-like receptors (TLRs) belong to a class of pattern-recognition receptors that play an important role in host defense against pathogens by recognizing a wide variety of pathogen-associated molecular patterns (PAMPs). Besides driving inflammatory responses, TLRs also regulate cell proliferation and survival by expanding useful immune cells and integrating inflammatory responses and tissue repair processes. TLR signaling, which is centrally involved in the initiation of both innate and adaptive immune responses, has been thought to be restricted to immune cells. However, recent studies have shown that functional TLRs are expressed not only on immune cells, but also on cancer cells, thus implicating a role of TLRs in tumor biology. Increasing bodies of evidence have suggested that TLRs act as a double-edged sword in cancer cells because uncontrolled TLR signaling provides a microenvironment that is necessary for tumor cells to proliferate and evade the immune response. Alternatively, TLRs can induce an antitumor immune response in order to inhibit tumor progression. In this review, we summarize the dual roles of TLRs in tumor cells and, more importantly, delve into the therapeutic potential of TLRs in the context of tumorigenesis.
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Affiliation(s)
- Shaherin Basith
- Department of Molecular Science and Technology, Ajou University, Suwon, 443-749, Korea
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Preferential involvement of mitochondria in Toll-like receptor 3 agonist-induced neuroblastoma cell apoptosis, but not in inhibition of cell growth. Apoptosis 2012; 17:335-48. [PMID: 22187010 DOI: 10.1007/s10495-011-0686-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Double-stranded RNA (dsRNA) can mediate its therapeutic effect through Toll-like receptor 3 (TLR3) expressed on tumor cells including neuroblastoma. We used synthetic dsRNA polyinosinic-polycytidylic acid [Poly(I:C)] as a TLR3 agonist to treat TLR3-expressing SK-N-AS neuroblatoma (NB) cells. We found up-regulation of endoplasmic reticulum (ER) stress proteins glucose-regulated protein 78 and inositol-requiring enzyme 1. Bafilomycin A1, an inhibitor of ER function, effectively blocked poly(I:C)-induced activation of caspase-8, -9, and -3, MnSOD and glutathione peroxidase 1 and reduced poly(I:C)-induced SK-N-AS apoptosis. Pan caspase inhibitor and inhibitor of caspase-9, but not of caspase-8, inhibited poly(I:C)-induced activated caspase-3 expression. Rho zero (ρ(0))-SK-N-AS cells were resistant to poly(I:C)-induced mitochondrial reactive oxygen species production and apoptosis, but not to inhibition of cell growth, as compared to parent SK-N-AS cells. Taking together, these findings suggest that mitochondria are preferentially involved in poly(I:C)-induced NB cell apoptosis, but not in inhibition of cell growth. A crosstalk between mitochondria and ER is implicated.
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Activation of Toll-like receptor 3 induces apoptosis of oral squamous carcinoma cells in vitro and in vivo. Int J Biochem Cell Biol 2012; 44:1266-75. [PMID: 22568929 DOI: 10.1016/j.biocel.2012.04.025] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Revised: 04/24/2012] [Accepted: 04/30/2012] [Indexed: 12/16/2022]
Abstract
Toll-like receptors are well known as molecular sensors of pathogen-associated molecular patterns. They control activation of the innate immune response and subsequently shape the adaptive immune response. Recent publications have demonstrated that Toll-like receptors also play important roles in multiple human cancers, yet their function in oral squamous cell carcinoma remains unclear. In this study, we showed that both oral squamous cell carcinoma cell lines and tissues from oral squamous carcinoma patients express relatively high levels of Toll-like receptor 3. We also found that synthetic dsRNA-polyinosinic-polycytidilic acid, a Toll-like receptor 3 ligand, induced apoptosis of oral squamous carcinoma cells mainly via Toll-like receptor 3, through interferon-β production and activation of caspases 3 and 9. Moreover, in an oral squamous cell carcinoma xenograft mouse model, we demonstrated for the first time that activation of Toll-like receptor 3 inhibited oral squamous cell carcinoma tumor growth in vivo. Therefore, the direct proapoptotic activity of Toll-like receptor 3 in human oral squamous carcinoma cells may make this protein a viable therapeutic target in the treatment of oral squamous cell carcinoma.
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