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Shao A, Xu Q, Spalek WT, Cain CF, Kang CW, Tang CHA, Del Valle JR, Hu CCA. Development of Tumor-Targeting IRE-1 Inhibitors for B-cell Cancer Therapy. Mol Cancer Ther 2020; 19:2432-2444. [PMID: 33051362 DOI: 10.1158/1535-7163.mct-20-0127] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 07/02/2020] [Accepted: 10/08/2020] [Indexed: 11/16/2022]
Abstract
The IRE-1 kinase/RNase splices the mRNA of the XBP-1 gene, resulting in the spliced XBP-1 (XBP-1s) mRNA that encodes the functional XBP-1s transcription factor that is critically important for the growth and survival of B-cell leukemia, lymphoma, and multiple myeloma (MM). Several inhibitors targeting the expression of XBP-1s have been reported; however, the cytotoxicity exerted by each inhibitor against cancer cells is highly variable. To design better therapeutic strategies for B-cell cancer, we systematically compared the ability of these compounds to inhibit the RNase activity of IRE-1 in vitro and to suppress the expression of XBP-1s in mouse and human MM cell lines. Tricyclic chromenone-based inhibitors B-I09 and D-F07, prodrugs harboring an aldehyde-masking group, emerged as the most reliable inhibitors for potent suppression of XBP-1s expression in MM cells. The cytotoxicity of B-I09 and D-F07 against MM as well as chronic lymphocytic leukemia and mantle cell lymphoma could be further enhanced by combination with inhibitors of the PI3K/AKT pathway. Because chemical modifications of the salicylaldehyde hydroxy group could be used to tune 1,3-dioxane prodrug stability, we installed reactive oxygen species-sensitive structural cage groups onto these inhibitors to achieve stimuli-responsive activities and improve tumor-targeting efficiency.
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Affiliation(s)
- Andong Shao
- The Wistar Institute, Philadelphia, Pennsylvania
| | - Qin Xu
- The Wistar Institute, Philadelphia, Pennsylvania
| | | | - Christopher F Cain
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana
| | - Chang Won Kang
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana
| | | | - Juan R Del Valle
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana.
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Raymundo DP, Doultsinos D, Guillory X, Carlesso A, Eriksson LA, Chevet E. Pharmacological Targeting of IRE1 in Cancer. Trends Cancer 2020; 6:1018-1030. [PMID: 32861679 DOI: 10.1016/j.trecan.2020.07.006] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 07/06/2020] [Accepted: 07/20/2020] [Indexed: 12/20/2022]
Abstract
IRE1α (inositol requiring enzyme 1 alpha) is one of the main transducers of the unfolded protein response (UPR). IRE1α plays instrumental protumoral roles in several cancers, and high IRE1α activity has been associated with poorer prognoses. In this context, IRE1α has been identified as a potentially relevant therapeutic target. Pharmacological inhibition of IRE1α activity can be achieved by targeting either the kinase domain or the RNase domain. Herein, the recent advances in IRE1α pharmacological targeting is summarized. We describe the identification and optimization of IRE1α inhibitors as well as their mode of action and limitations as anticancer drugs. The potential pitfalls and challenges that could be faced in the clinic, and the opportunities that IRE1α modulating strategies may present are discussed.
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Affiliation(s)
- Diana Pelizzari Raymundo
- Proteostasis and Cancer Team, INSERM U1242, COSS Laboratory, Université de Rennes, Rennes, France; Centre de Lutte contre le Cancer Eugène Marquis, Rennes, France
| | - Dimitrios Doultsinos
- Proteostasis and Cancer Team, INSERM U1242, COSS Laboratory, Université de Rennes, Rennes, France; Centre de Lutte contre le Cancer Eugène Marquis, Rennes, France
| | - Xavier Guillory
- Institut des Science Chimiques de Rennes, CNRS UMR6226, Université de Rennes, Rennes, France
| | - Antonio Carlesso
- Department of Chemistry and Molecular Biology, University of Gothenburg, Göteborg, Sweden
| | - Leif A Eriksson
- Department of Chemistry and Molecular Biology, University of Gothenburg, Göteborg, Sweden.
| | - Eric Chevet
- Proteostasis and Cancer Team, INSERM U1242, COSS Laboratory, Université de Rennes, Rennes, France; Centre de Lutte contre le Cancer Eugène Marquis, Rennes, France.
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Xu L, Zhang W, Zhang XHF, Chen X. Endoplasmic Reticulum Stress in Bone Metastases. Front Oncol 2020; 10:1100. [PMID: 32850317 PMCID: PMC7396666 DOI: 10.3389/fonc.2020.01100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 06/02/2020] [Indexed: 12/12/2022] Open
Abstract
Metastases-the spreading of cancer cells from primary tumors to distant organs, including bone-is often incurable and is the major cause of morbidity in cancer patients. Understanding how cancer cells acquire the ability to colonize to bone and become overt metastases is critical to identify new therapeutic targets and develop new therapies against bone metastases. Recent reports indicate that the endoplasmic reticulum (ER) stress and, as its consequence, the unfolded protein response (UPR) is activated during metastatic dissemination. However, their roles in this process remain largely unknown. In this review, we discuss the recent progress on evaluating the tumorigenic, immunoregulatory and metastatic effects of ER stress and the UPR on bone metastases. We explore new opportunities to translate this knowledge into potential therapeutic strategies for patients with bone metastases.
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Affiliation(s)
- Longyong Xu
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, United States
- Lester and Sue Smith Breast Center, Baylor College of Medicine, Houston, TX, United States
- Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, TX, United States
| | - Weijie Zhang
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, United States
- Lester and Sue Smith Breast Center, Baylor College of Medicine, Houston, TX, United States
- Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, TX, United States
| | - Xiang H.-F. Zhang
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, United States
- Lester and Sue Smith Breast Center, Baylor College of Medicine, Houston, TX, United States
- Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, TX, United States
| | - Xi Chen
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, United States
- Lester and Sue Smith Breast Center, Baylor College of Medicine, Houston, TX, United States
- Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, TX, United States
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Forno F, Maatuf Y, Boukeileh S, Dipta P, Mahameed M, Darawshi O, Ferreira V, Rada P, García-Martinez I, Gross E, Priel A, Valverde ÁM, Tirosh B. Aripiprazole Cytotoxicity Coincides with Activation of the Unfolded Protein Response in Human Hepatic Cells. J Pharmacol Exp Ther 2020; 374:452-461. [PMID: 32554435 DOI: 10.1124/jpet.119.264481] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Accepted: 06/08/2020] [Indexed: 12/26/2022] Open
Abstract
Schizophrenia is a mental disease that results in decreased life expectancy and well-being by promoting obesity and sedentary lifestyles. Schizophrenia is treated by antipsychotic drugs. Although the second-generation antipsychotics (SGA), Olanzapine and Aripiprazole, are more effective in treating schizophrenia, they display a higher risk of metabolic side effects, mostly by development of diabetes and insulin resistance, weight gain, and dyslipidemia. Endoplasmic reticulum (ER) stress is induced when ER homeostasis of lipid biosynthesis and protein folding is impaired. This leads to the activation of the unfolded protein response (UPR), a signaling cascade that aims to restore ER homeostasis or initiate cell death. Chronic conditions of ER stress in the liver are associated with diabetes and perturbed lipid metabolism. These metabolic dysfunctions resemble the pharmacological side effects of SGAs. We therefore investigated whether SGAs promote the UPR in human and mouse hepatocytes. We observed full-fledged activation of ER stress by Aripiprazole not by Olanzapine. This occurred at low micromolar concentrations and to variable intensities in different cell types, such as hepatocellular carcinoma, melanoma, and glioblastoma. Mechanistically, Aripiprazole caused depletion of ER calcium, leading to activation of inositol-requiring enzyme 1 (IRE1)and protein kinase R (PKR)-like endoplasmic reticulum kinase (PERK), two major transducers of the UPR. Cells underwent apoptosis with Aripiprazole treatment, which coincided with UPR induction, and this effect was reduced by adding glutathione without affecting UPR itself. Deletion of IRE1 from HepG2, a human liver cancer cell line, protected cells from Aripiprazole toxicity. Our study reveals for the first time a cytotoxic effect of Aripiprazole that involves the induction of ER stress. SIGNIFICANCE STATEMENT: The antischizophrenic drug Aripiprazole exerts cytotoxic properties at high concentrations. This study shows that this cytotoxicity is associated with the induction of endoplasmic reticulum (ER) stress and IRE1 activation, mechanisms involved in diet-induced obesity. Aripiprazole induced ER stress and calcium mobilization from the ER in human and mouse hepatocytes. Our study highlights a new mechanism of Aripiprazole that is not related to its effect on dopamine signaling.
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Affiliation(s)
- Francesca Forno
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel (F.F., Y.M., S.B., P.D., M.M., O.D., A.P., B.T.); Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERdem), ISCIII, Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); and Department of Biochemistry and Molecular Biology, IMRIC, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel (E.G.)
| | - Yossi Maatuf
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel (F.F., Y.M., S.B., P.D., M.M., O.D., A.P., B.T.); Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERdem), ISCIII, Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); and Department of Biochemistry and Molecular Biology, IMRIC, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel (E.G.)
| | - Shatha Boukeileh
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel (F.F., Y.M., S.B., P.D., M.M., O.D., A.P., B.T.); Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERdem), ISCIII, Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); and Department of Biochemistry and Molecular Biology, IMRIC, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel (E.G.)
| | - Priya Dipta
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel (F.F., Y.M., S.B., P.D., M.M., O.D., A.P., B.T.); Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERdem), ISCIII, Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); and Department of Biochemistry and Molecular Biology, IMRIC, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel (E.G.)
| | - Mohamed Mahameed
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel (F.F., Y.M., S.B., P.D., M.M., O.D., A.P., B.T.); Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERdem), ISCIII, Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); and Department of Biochemistry and Molecular Biology, IMRIC, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel (E.G.)
| | - Odai Darawshi
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel (F.F., Y.M., S.B., P.D., M.M., O.D., A.P., B.T.); Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERdem), ISCIII, Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); and Department of Biochemistry and Molecular Biology, IMRIC, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel (E.G.)
| | - Vitor Ferreira
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel (F.F., Y.M., S.B., P.D., M.M., O.D., A.P., B.T.); Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERdem), ISCIII, Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); and Department of Biochemistry and Molecular Biology, IMRIC, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel (E.G.)
| | - Patricia Rada
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel (F.F., Y.M., S.B., P.D., M.M., O.D., A.P., B.T.); Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERdem), ISCIII, Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); and Department of Biochemistry and Molecular Biology, IMRIC, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel (E.G.)
| | - Irma García-Martinez
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel (F.F., Y.M., S.B., P.D., M.M., O.D., A.P., B.T.); Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERdem), ISCIII, Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); and Department of Biochemistry and Molecular Biology, IMRIC, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel (E.G.)
| | - Einav Gross
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel (F.F., Y.M., S.B., P.D., M.M., O.D., A.P., B.T.); Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERdem), ISCIII, Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); and Department of Biochemistry and Molecular Biology, IMRIC, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel (E.G.)
| | - Avi Priel
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel (F.F., Y.M., S.B., P.D., M.M., O.D., A.P., B.T.); Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERdem), ISCIII, Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); and Department of Biochemistry and Molecular Biology, IMRIC, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel (E.G.)
| | - Ángela M Valverde
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel (F.F., Y.M., S.B., P.D., M.M., O.D., A.P., B.T.); Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERdem), ISCIII, Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); and Department of Biochemistry and Molecular Biology, IMRIC, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel (E.G.)
| | - Boaz Tirosh
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel (F.F., Y.M., S.B., P.D., M.M., O.D., A.P., B.T.); Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERdem), ISCIII, Madrid, Spain (V.F., P.R., I.G.-M., Á.M.V.); and Department of Biochemistry and Molecular Biology, IMRIC, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel (E.G.)
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Khateb A, Ronai ZA. Unfolded Protein Response in Leukemia: From Basic Understanding to Therapeutic Opportunities. Trends Cancer 2020; 6:960-973. [PMID: 32540455 DOI: 10.1016/j.trecan.2020.05.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 05/03/2020] [Accepted: 05/19/2020] [Indexed: 12/11/2022]
Abstract
Understanding genetic and epigenetic changes that underlie abnormal proliferation of hematopoietic stem and progenitor cells is critical for development of new approaches to monitor and treat leukemia. The unfolded protein response (UPR) is a conserved adaptive signaling pathway that governs protein folding, secretion, and energy production and serves to maintain protein homeostasis in various cellular compartments. Deregulated UPR signaling, which often occurs in hematopoietic stem cells and leukemia, defines the degree of cellular toxicity and perturbs protein homeostasis, and at the same time, offers a novel therapeutic target. Here, we review current knowledge related to altered UPR signaling in leukemia and highlight possible strategies for exploiting the UPR as treatment for this disease.
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Affiliation(s)
- Ali Khateb
- Tumor Initiation and Maintenance Program, National Cancer Institute (NCI) Designated Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA
| | - Ze'ev A Ronai
- Tumor Initiation and Maintenance Program, National Cancer Institute (NCI) Designated Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA.
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56
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Hetz C, Zhang K, Kaufman RJ. Mechanisms, regulation and functions of the unfolded protein response. Nat Rev Mol Cell Biol 2020; 21:421-438. [PMID: 32457508 DOI: 10.1038/s41580-020-0250-z] [Citation(s) in RCA: 1090] [Impact Index Per Article: 272.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/14/2020] [Indexed: 12/21/2022]
Abstract
Cellular stress induced by the abnormal accumulation of unfolded or misfolded proteins at the endoplasmic reticulum (ER) is emerging as a possible driver of human diseases, including cancer, diabetes, obesity and neurodegeneration. ER proteostasis surveillance is mediated by the unfolded protein response (UPR), a signal transduction pathway that senses the fidelity of protein folding in the ER lumen. The UPR transmits information about protein folding status to the nucleus and cytosol to adjust the protein folding capacity of the cell or, in the event of chronic damage, induce apoptotic cell death. Recent advances in the understanding of the regulation of UPR signalling and its implications in the pathophysiology of disease might open new therapeutic avenues.
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Affiliation(s)
- Claudio Hetz
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile. .,FONDAP Center for Geroscience Brain Health and Metabolism (GERO), Santiago, Chile. .,Program of Cellular and Molecular Biology, Institute of Biomedical Science, University of Chile, Santiago, Chile. .,Buck Institute for Research on Aging, Novato, CA, USA.
| | - Kezhong Zhang
- Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI, USA. .,Department of Biochemistry, Microbiology and Immunology, Wayne State University School of Medicine, Detroit, MI, USA.
| | - Randal J Kaufman
- Degenerative Diseases Program, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA.
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57
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Kolpikova EP, Tronco AR, Den Hartigh AB, Jackson KJ, Iwawaki T, Fink SL. IRE1α Promotes Zika Virus Infection via XBP1. Viruses 2020; 12:v12030278. [PMID: 32138181 PMCID: PMC7150863 DOI: 10.3390/v12030278] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 02/28/2020] [Indexed: 12/17/2022] Open
Abstract
Zika virus (ZIKV) is an emergent member of the Flaviviridae family which causes severe congenital defects and other major sequelae, but the cellular processes that support ZIKV replication are incompletely understood. Related flaviviruses use the endoplasmic reticulum (ER) as a membranous platform for viral replication and induce ER stress during infection. Our data suggest that ZIKV activates IRE1α, a component of the cellular response to ER stress. IRE1α is an ER-resident transmembrane protein that possesses a cytosolic RNase domain. Upon activation, IRE1α initiates nonconventional cytoplasmic splicing of XBP1 mRNA. Spliced XBP1 encodes a transcription factor, which upregulates ER-related targets. We find that ZIKV infection induces XBP1 mRNA splicing and induction of XBP1 target genes. Small molecule inhibitors of IRE1α, including those specific for the nuclease function, prevent ZIKV-induced cytotoxicity, as does genetic disruption of IRE1α. Optimal ZIKV RNA replication requires both IRE1α and XBP1. Spliced XBP1 has been described to cause ER expansion and remodeling and we find that ER redistribution during ZIKV infection requires IRE1α nuclease activity. Finally, we demonstrate that inducible genetic disruption of IRE1α and XBP1 impairs ZIKV replication in a mouse model of infection. Together, our data indicate that the ER stress response component IRE1α promotes ZIKV infection via XBP1 and may represent a potential therapeutic target.
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Affiliation(s)
- Elena P. Kolpikova
- Department of Laboratory Medicine, University of Washington, Seattle, WA 98195, USA
| | - Ana R. Tronco
- Department of Laboratory Medicine, University of Washington, Seattle, WA 98195, USA
| | | | - Konner J. Jackson
- Department of Laboratory Medicine, University of Washington, Seattle, WA 98195, USA
| | - Takao Iwawaki
- Division of Cell Medicine, Department of Life Science, Medical Research Institute, Kanazawa Medical University, Uchinada, Ishikawa 920-0265, Japan
| | - Susan L. Fink
- Department of Laboratory Medicine, University of Washington, Seattle, WA 98195, USA
- Correspondence: ; Tel.: +1-(206)-598-6131
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58
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Luesch H, Paavilainen VO. Natural products as modulators of eukaryotic protein secretion. Nat Prod Rep 2020; 37:717-736. [PMID: 32067014 DOI: 10.1039/c9np00066f] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Covering: up to the end of 2019Diverse natural product small molecules have allowed critical insights into processes that govern eukaryotic cells' ability to secrete cytosolically synthesized secretory proteins into their surroundings or to insert newly synthesized integral membrane proteins into the lipid bilayer of the endoplasmic reticulum. In addition, many components of the endoplasmic reticulum, required for protein homeostasis or other processes such as lipid metabolism or maintenance of calcium homeostasis, are being investigated for their potential in modulating human disease conditions such as cancer, neurodegenerative conditions and diabetes. In this review, we cover recent findings up to the end of 2019 on natural products that influence protein secretion or impact ER protein homeostasis, and serve as powerful chemical tools to understand protein flux through the mammalian secretory pathway and as leads for the discovery of new therapeutics.
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Affiliation(s)
- Hendrik Luesch
- Department of Medicinal Chemistry, Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, P.O. Box 100485, Gainesville, Florida 32610, USA.
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59
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Li A, Song NJ, Riesenberg BP, Li Z. The Emerging Roles of Endoplasmic Reticulum Stress in Balancing Immunity and Tolerance in Health and Diseases: Mechanisms and Opportunities. Front Immunol 2020; 10:3154. [PMID: 32117210 PMCID: PMC7026265 DOI: 10.3389/fimmu.2019.03154] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Accepted: 12/30/2019] [Indexed: 12/14/2022] Open
Abstract
The endoplasmic reticulum (ER) is an organelle equipped with mechanisms for proper protein folding, trafficking, and degradation to maintain protein homeostasis in the secretory pathway. As a defense mechanism, perturbation of ER proteostasis by ER stress agents activates a cascade of signaling pathways from the ER to the nucleus known as unfolded protein response (UPR). The primary goal of UPR is to induce transcriptional and translational programs to restore ER homeostasis for cell survival. As such, defects in UPR signaling have been implicated as a key contributor to multiple diseases including metabolic diseases, degenerative diseases, inflammatory disorders, and cancer. Growing evidence support the critical role of ER stress in regulating the fate as well as the magnitude of the immune response. Moreover, the availability of multiple UPR pharmacological inhibitors raises the hope that targeting UPR can be a new strategy for immune modulation and immunotherapy of diseases. This paper reviews the principal mechanisms by which ER stress affects immune cell biology and function, with a focus of discussion on UPR-associated immunopathology and the development of potential ER stress-targeted therapeutics.
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Affiliation(s)
- Anqi Li
- College of Medicine, The Ohio State University, Columbus, OH, United States.,The James Comprehensive Cancer Center, Pelotonia Institute for Immuno-Oncology, The Ohio State University, Columbus, OH, United States
| | - No-Joon Song
- The James Comprehensive Cancer Center, Pelotonia Institute for Immuno-Oncology, The Ohio State University, Columbus, OH, United States
| | - Brian P Riesenberg
- The James Comprehensive Cancer Center, Pelotonia Institute for Immuno-Oncology, The Ohio State University, Columbus, OH, United States
| | - Zihai Li
- College of Medicine, The Ohio State University, Columbus, OH, United States.,The James Comprehensive Cancer Center, Pelotonia Institute for Immuno-Oncology, The Ohio State University, Columbus, OH, United States.,Division of Medical Oncology, Department of Medicine, The Ohio State University, Columbus, OH, United States
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60
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Wu Chuang A, Kepp O, Kroemer G, Bezu L. Endoplasmic reticulum stress in the cellular release of damage-associated molecular patterns. BIOLOGY OF THE ENDOPLASMIC RETICULUM 2020; 350:1-28. [DOI: 10.1016/bs.ircmb.2019.11.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Coleman OI, Haller D. ER Stress and the UPR in Shaping Intestinal Tissue Homeostasis and Immunity. Front Immunol 2019; 10:2825. [PMID: 31867005 PMCID: PMC6904315 DOI: 10.3389/fimmu.2019.02825] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 11/18/2019] [Indexed: 12/29/2022] Open
Abstract
An imbalance in the correct protein folding milieu of the endoplasmic reticulum (ER) can cause ER stress, which leads to the activation of the unfolded protein response (UPR). The UPR constitutes a highly conserved and intricately regulated group of pathways that serve to restore ER homeostasis through adaptation or apoptosis. Numerous studies over the last decade have shown that the UPR plays a critical role in shaping immunity and inflammation, resulting in the recognition of the UPR as a key player in pathological processes including complex inflammatory, autoimmune and neoplastic diseases. The intestinal epithelium, with its many highly secretory cells, forms an important barrier and messenger between the luminal environment and the host immune system. It is not surprising, that numerous studies have associated ER stress and the UPR with intestinal diseases such as inflammatory bowel disease (IBD) and colorectal cancer (CRC). In this review, we discuss our current understanding of the roles of ER stress and the UPR in shaping immune responses and maintaining tissue homeostasis. Furthermore, the role played by the UPR in disease, with emphasis on IBD and CRC, is described here. As a key player in immunity and inflammation, the UPR has been increasingly recognized as an important pharmacological target in the development of therapeutic strategies for immune-mediated pathologies. We summarize available strategies targeting the UPR and their therapeutic implications. Understanding the balance between homeostasis and pathophysiology, as well as means of manipulating this balance, provides an important avenue for future research.
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Affiliation(s)
- Olivia I Coleman
- Chair of Nutrition and Immunology, Technical University of Munich, Munich, Germany
| | - Dirk Haller
- Chair of Nutrition and Immunology, Technical University of Munich, Munich, Germany.,ZIEL - Institute for Food & Health, Technical University of Munich, Munich, Germany
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62
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Sprooten J, Garg AD. Type I interferons and endoplasmic reticulum stress in health and disease. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2019; 350:63-118. [PMID: 32138904 PMCID: PMC7104985 DOI: 10.1016/bs.ircmb.2019.10.004] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Type I interferons (IFNs) comprise of pro-inflammatory cytokines created, as well as sensed, by all nucleated cells with the main objective of blocking pathogens-driven infections. Owing to this broad range of influence, type I IFNs also exhibit critical functions in many sterile inflammatory diseases and immunopathologies, especially those associated with endoplasmic reticulum (ER) stress-driven signaling pathways. Indeed, over the years accumulating evidence has indicated that the presence of ER stress can influence the production, or sensing of, type I IFNs induced by perturbations like pattern recognition receptor (PRR) agonists, infections (bacterial, viral or parasitic) or autoimmunity. In this article we discuss the link between type I IFNs and ER stress in various diseased contexts. We describe how ER stress regulates type I IFNs production or sensing, or how type I IFNs may induce ER stress, in various circumstances like microbial infections, autoimmunity, diabetes, cancer and other ER stress-related contexts.
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Affiliation(s)
- Jenny Sprooten
- Department for Cellular and Molecular Medicine, Cell Death Research & Therapy (CDRT) Unit, KU Leuven, Leuven, Belgium
| | - Abhishek D Garg
- Department for Cellular and Molecular Medicine, Cell Death Research & Therapy (CDRT) Unit, KU Leuven, Leuven, Belgium.
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63
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Nam SM, Jeon YJ. Proteostasis In The Endoplasmic Reticulum: Road to Cure. Cancers (Basel) 2019; 11:E1793. [PMID: 31739582 PMCID: PMC6895847 DOI: 10.3390/cancers11111793] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 11/04/2019] [Accepted: 11/12/2019] [Indexed: 12/14/2022] Open
Abstract
The endoplasmic reticulum (ER) is an interconnected organelle that is responsible for the biosynthesis, folding, maturation, stabilization, and trafficking of transmembrane and secretory proteins. Therefore, cells evolve protein quality-control equipment of the ER to ensure protein homeostasis, also termed proteostasis. However, disruption in the folding capacity of the ER caused by a large variety of pathophysiological insults leads to the accumulation of unfolded or misfolded proteins in this organelle, known as ER stress. Upon ER stress, unfolded protein response (UPR) of the ER is activated, integrates ER stress signals, and transduces the integrated signals to relive ER stress, thereby leading to the re-establishment of proteostasis. Intriguingly, severe and persistent ER stress and the subsequently sustained unfolded protein response (UPR) are closely associated with tumor development, angiogenesis, aggressiveness, immunosuppression, and therapeutic response of cancer. Additionally, the UPR interconnects various processes in and around the tumor microenvironment. Therefore, it has begun to be delineated that pharmacologically and genetically manipulating strategies directed to target the UPR of the ER might exhibit positive clinical outcome in cancer. In the present review, we summarize recent advances in our understanding of the UPR of the ER and the UPR of the ER-mitochondria interconnection. We also highlight new insights into how the UPR of the ER in response to pathophysiological perturbations is implicated in the pathogenesis of cancer. We provide the concept to target the UPR of the ER, eventually discussing the potential of therapeutic interventions for targeting the UPR of the ER for cancer treatment.
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Affiliation(s)
- Su Min Nam
- Department of Biochemistry, Chungnam National University College of Medicine, Daejeon 35015, Korea;
- Department of Medical Science, Chungnam National University College of Medicine, Daejeon 35015, Korea
| | - Young Joo Jeon
- Department of Biochemistry, Chungnam National University College of Medicine, Daejeon 35015, Korea;
- Department of Medical Science, Chungnam National University College of Medicine, Daejeon 35015, Korea
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64
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Polyalthia longifolia Extract Triggers ER Stress in Prostate Cancer Cells Concomitant with Induction of Apoptosis: Insights from In Vitro and In Vivo Studies. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:6726312. [PMID: 31827691 PMCID: PMC6881593 DOI: 10.1155/2019/6726312] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 09/03/2019] [Accepted: 09/13/2019] [Indexed: 02/06/2023]
Abstract
Plant-based therapies are being explored to prevent or treat several cancer types. The antioxidant properties of Polyalthia longifolia plant are well established. In our previous work, we demonstrated the presence of cytotoxic compounds in the methanol extract of Polyalthia longifolia (MEP) with potent activity against human leukemia cells. In the present study, we evaluated the efficacy of MEP against prostate cancer (PCa) and established the molecular basis of its effect in in vitro and in vivo models. We observed that MEP treatment resulted in a significant decrease in the growth and viability of PCa cells, associated with arrest in the G1/S phase of the cell cycle. Apoptosis was confirmed as the primary mode of MEP-induced cell death through activation of the intrinsic apoptotic machinery. Proteomic and biochemical studies identified BiP as an important target of MEP with the activation of the ER stress pathway, as a potential mechanism driving MEP-induced apoptosis. The extract exhibited strong efficacy in the PCa xenograft mouse model with significant inhibition of tumor growth and reduced tumor burden. Taken together, our findings indicate that MEP-induced apoptosis in PCa cells concomitant with the activation of the ER stress pathways results in the inhibition of tumor growth, in vitro and in vivo. Our studies provide initial evidence of the efficacy of MEP against PCa and advocate for in-depth studies in other preclinical models for its possible use in clinical settings.
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65
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Sicari D, Igbaria A, Chevet E. Control of Protein Homeostasis in the Early Secretory Pathway: Current Status and Challenges. Cells 2019; 8:E1347. [PMID: 31671908 PMCID: PMC6912474 DOI: 10.3390/cells8111347] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 10/21/2019] [Accepted: 10/23/2019] [Indexed: 12/20/2022] Open
Abstract
: Discrimination between properly folded proteins and those that do not reach this state is necessary for cells to achieve functionality. Eukaryotic cells have evolved several mechanisms to ensure secretory protein quality control, which allows efficiency and fidelity in protein production. Among the actors involved in such process, both endoplasmic reticulum (ER) and the Golgi complex play prominent roles in protein synthesis, biogenesis and secretion. ER and Golgi functions ensure that only properly folded proteins are allowed to flow through the secretory pathway while improperly folded proteins have to be eliminated to not impinge on cellular functions. Thus, complex quality control and degradation machineries are crucial to prevent the toxic accumulation of improperly folded proteins. However, in some instances, improperly folded proteins can escape the quality control systems thereby contributing to several human diseases. Herein, we summarize how the early secretory pathways copes with the accumulation of improperly folded proteins, and how insufficient handling can cause the development of several human diseases. Finally, we detail the genetic and pharmacologic approaches that could be used as potential therapeutic tools to treat these diseases.
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Affiliation(s)
- Daria Sicari
- Proteostasis & Cancer Team INSERM U1242 « Chemistry, Oncogenesis Stress Signaling », Université de Rennes, CEDEX, 35042 Rennes, France.
- Centre de Lutte contre le Cancer Eugène Marquis, CEDEX, 35042 Rennes, France.
| | - Aeid Igbaria
- Proteostasis & Cancer Team INSERM U1242 « Chemistry, Oncogenesis Stress Signaling », Université de Rennes, CEDEX, 35042 Rennes, France.
- Centre de Lutte contre le Cancer Eugène Marquis, CEDEX, 35042 Rennes, France.
| | - Eric Chevet
- Proteostasis & Cancer Team INSERM U1242 « Chemistry, Oncogenesis Stress Signaling », Université de Rennes, CEDEX, 35042 Rennes, France.
- Centre de Lutte contre le Cancer Eugène Marquis, CEDEX, 35042 Rennes, France.
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66
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Hetz C, Axten JM, Patterson JB. Pharmacological targeting of the unfolded protein response for disease intervention. Nat Chem Biol 2019; 15:764-775. [PMID: 31320759 DOI: 10.1038/s41589-019-0326-2] [Citation(s) in RCA: 170] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Accepted: 06/17/2019] [Indexed: 02/07/2023]
Abstract
Accumulation of unfolded proteins at the endoplasmic reticulum (ER) is a salient attribute of many human diseases including obesity, liver disorders, cancer, diabetes and neurodegeneration. To restore ER proteostasis, cells activate the unfolded protein response (UPR), a signaling pathway that imposes adaptive programs or triggers apoptosis of damaged cells. The UPR is critical to sustain the normal function of specialized secretory cells (i.e., pancreatic β cells and B lymphocytes) and to control the production of lipids and cholesterol in the liver. In the context of disease, adaptive UPR responses have been linked to the growth of solid tumors, whereas chronic ER stress contributes to cell dysfunction in brain diseases, metabolic syndromes, among other conditions. Here we discuss recent developments in the design and optimization of novel compounds to manipulate UPR signaling and their efficacy in various disease models.
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Affiliation(s)
- Claudio Hetz
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile. .,FONDAP Center for Geroscience, Brain Health and Metabolism, Santiago, Chile. .,Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile. .,Buck Institute for Research on Aging, Novato, CA, USA. .,Department of Immunology and Infectious diseases, Harvard School of Public Health, Boston, MA, USA.
| | - Jeffrey M Axten
- Medicinal Chemistry, Medicine Design, GlaxoSmithKline, Collegeville, PA, USA.
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67
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Ma X, Bi E, Lu Y, Su P, Huang C, Liu L, Wang Q, Yang M, Kalady MF, Qian J, Zhang A, Gupte AA, Hamilton DJ, Zheng C, Yi Q. Cholesterol Induces CD8 + T Cell Exhaustion in the Tumor Microenvironment. Cell Metab 2019; 30:143-156.e5. [PMID: 31031094 PMCID: PMC7061417 DOI: 10.1016/j.cmet.2019.04.002] [Citation(s) in RCA: 462] [Impact Index Per Article: 92.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 01/25/2019] [Accepted: 04/02/2019] [Indexed: 12/28/2022]
Abstract
Tumor-infiltrating T cells often lose their effector function; however, the mechanisms are incompletely understood. We report that cholesterol in the tumor microenvironment induces CD8+ T cell expression of immune checkpoints and exhaustion. Tumor tissues enriched with cholesterol and cholesterol content in tumor-infiltrating CD8+ T cells were positively and progressively associated with upregulated T cell expression of PD-1, 2B4, TIM-3, and LAG-3. Adoptively transferred CD8+ T cells acquired cholesterol, expressed high levels of immune checkpoints, and became exhausted upon entering a tumor. Tumor culture supernatant or cholesterol induced immune checkpoint expression by increasing endoplasmic reticulum (ER) stress in CD8+ T cells. Consequently, the ER stress sensor XBP1 was activated and regulated PD-1 and 2B4 transcription. Inhibiting XBP1 or reducing cholesterol in CD8+ T cells effectively restored antitumor activity. This study reveals a mechanism underlying T cell exhaustion and suggests a new strategy for restoring T cell function by reducing cholesterol to enhance T cell-based immunotherapy.
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Affiliation(s)
- Xingzhe Ma
- Center for Translational Research in Hematologic Malignancies, Houston Methodist Cancer Center, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Enguang Bi
- Center for Translational Research in Hematologic Malignancies, Houston Methodist Cancer Center, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Yong Lu
- Department of Microbiology & Immunology, Wake Forest School of Medicine, Winston-Salem, NC 27109, USA
| | - Pan Su
- Center for Translational Research in Hematologic Malignancies, Houston Methodist Cancer Center, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Chunjian Huang
- Center for Translational Research in Hematologic Malignancies, Houston Methodist Cancer Center, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Lintao Liu
- Center for Translational Research in Hematologic Malignancies, Houston Methodist Cancer Center, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Qiang Wang
- Center for Translational Research in Hematologic Malignancies, Houston Methodist Cancer Center, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Maojie Yang
- Center for Translational Research in Hematologic Malignancies, Houston Methodist Cancer Center, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Matthew F Kalady
- Department of Colorectal Surgery, Digestive Disease Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Jianfei Qian
- Center for Translational Research in Hematologic Malignancies, Houston Methodist Cancer Center, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Aijun Zhang
- Center for Bioenergetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Anisha A Gupte
- Center for Bioenergetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Dale J Hamilton
- Center for Bioenergetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Chengyun Zheng
- Department of Hematology, Second Hospital of Shandong University, Jinan 250033, China
| | - Qing Yi
- Center for Translational Research in Hematologic Malignancies, Houston Methodist Cancer Center, Houston Methodist Research Institute, Houston, TX 77030, USA.
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68
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Shao A, Kang CW, Tang CHA, Cain CF, Xu Q, Phoumyvong CM, Del Valle JR, Hu CCA. Structural Tailoring of a Novel Fluorescent IRE-1 RNase Inhibitor to Precisely Control Its Activity. J Med Chem 2019; 62:5404-5413. [PMID: 31083990 DOI: 10.1021/acs.jmedchem.9b00269] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Activation of the IRE-1/XBP-1 pathway has been linked to many human diseases. We report a novel fluorescent tricyclic chromenone inhibitor, D-F07, in which we incorporated a 9-methoxy group onto the chromenone core to enhance its potency and masked the aldehyde to achieve long-term efficacy. Protection of the aldehyde as a 1,3-dioxane acetal led to strong fluorescence emitted by the coumarin chromophore, enabling D-F07 to be tracked inside the cell. We installed a photolabile structural cage on the hydroxy group of D-F07 to generate PC-D-F07. Such a modification significantly stabilized the 1,3-dioxane acetal protecting group, allowing for specific stimulus-mediated control of inhibitory activity. Upon photoactivation, the re-exposed hydroxy group on D-F07 triggered the aldehyde-protecting 1,3-dioxane acetal to slowly decompose, leading to the inhibition of the RNase activity of IRE-1. Our novel findings will also allow for spatiotemporal control of the inhibitory effect of other salicylaldehyde-based compounds currently in development.
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Affiliation(s)
- Andong Shao
- The Wistar Institute , 3601 Spruce Street , Philadelphia , Pennsylvania 19104 , United States
| | - Chang Won Kang
- Department of Chemistry , University of South Florida , Tampa , Florida 33620 , United States
| | - Chih-Hang Anthony Tang
- The Wistar Institute , 3601 Spruce Street , Philadelphia , Pennsylvania 19104 , United States
| | - Christopher F Cain
- Department of Chemistry , University of South Florida , Tampa , Florida 33620 , United States
| | - Qin Xu
- The Wistar Institute , 3601 Spruce Street , Philadelphia , Pennsylvania 19104 , United States
| | - Claire M Phoumyvong
- The Wistar Institute , 3601 Spruce Street , Philadelphia , Pennsylvania 19104 , United States
| | - Juan R Del Valle
- Department of Chemistry , University of South Florida , Tampa , Florida 33620 , United States
| | - Chih-Chi Andrew Hu
- The Wistar Institute , 3601 Spruce Street , Philadelphia , Pennsylvania 19104 , United States
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69
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Unfolded Protein Response (UPR) in Survival, Dormancy, Immunosuppression, Metastasis, and Treatments of Cancer Cells. Int J Mol Sci 2019; 20:ijms20102518. [PMID: 31121863 PMCID: PMC6566956 DOI: 10.3390/ijms20102518] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 03/22/2019] [Accepted: 03/22/2019] [Indexed: 02/06/2023] Open
Abstract
The endoplasmic reticulum (ER) has diverse functions, and especially misfolded protein modification is in the focus of this review paper. With a highly regulatory mechanism, called unfolded protein response (UPR), it protects cells from the accumulation of misfolded proteins. Nevertheless, not only does UPR modify improper proteins, but it also degrades proteins that are unable to recover. Three pathways of UPR, namely PERK, IRE-1, and ATF6, have a significant role in regulating stress-induced physiological responses in cells. The dysregulated UPR may be involved in diseases, such as atherosclerosis, heart diseases, amyotrophic lateral sclerosis (ALS), and cancer. Here, we discuss the relation between UPR and cancer, considering several aspects including survival, dormancy, immunosuppression, angiogenesis, and metastasis of cancer cells. Although several moderate adversities can subject cancer cells to a hostile environment, UPR can ensure their survival. Excessive unfavorable conditions, such as overloading with misfolded proteins and nutrient deprivation, tend to trigger cancer cell death signaling. Regarding dormancy and immunosuppression, cancer cells can survive chemotherapies and acquire drug resistance through dormancy and immunosuppression. Cancer cells can also regulate the downstream of UPR to modulate angiogenesis and promote metastasis. In the end, regulating UPR through different molecular mechanisms may provide promising anticancer treatment options by suppressing cancer proliferation and progression.
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70
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Guo C, Chen S, Liu W, Ma Y, Li J, Fisher PB, Fang X, Wang XY. Immunometabolism: A new target for improving cancer immunotherapy. Adv Cancer Res 2019; 143:195-253. [PMID: 31202359 DOI: 10.1016/bs.acr.2019.03.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Fundamental metabolic pathways are essential for mammalian cells to provide energy, precursors for biosynthesis of macromolecules, and reducing power for redox regulation. While dysregulated metabolism (e.g., aerobic glycolysis also known as the Warburg effect) has long been recognized as a hallmark of cancer, recent discoveries of metabolic reprogramming in immune cells during their activation and differentiation have led to an emerging concept of "immunometabolism." Considering the recent success of cancer immunotherapy in the treatment of several cancer types, increasing research efforts are being made to elucidate alterations in metabolic profiles of cancer and immune cells during their interplays in the setting of cancer progression and immunotherapy. In this review, we summarize recent advances in studies of metabolic reprogramming in cancer as well as differentiation and functionality of various immune cells. In particular, we will elaborate how distinct metabolic pathways in the tumor microenvironment cause functional impairment of immune cells and contribute to immune evasion by cancer. Lastly, we highlight the potential of metabolically reprogramming the tumor microenvironment to promote effective and long-lasting antitumor immunity for improved immunotherapeutic outcomes.
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Affiliation(s)
- Chunqing Guo
- Department of Human & Molecular Genetics, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Institute of Molecular Medicine, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Massey Cancer Center, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States
| | - Shixian Chen
- Department of Rheumatology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China; Department of Traditional Chinese Internal Medicine, School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, Guangdong, China
| | - Wenjie Liu
- Department of Human & Molecular Genetics, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Institute of Molecular Medicine, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Massey Cancer Center, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States
| | - Yibao Ma
- Department of Biochemistry & Molecular Biology, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States
| | - Juan Li
- Department of Rheumatology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China; Department of Traditional Chinese Internal Medicine, School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, Guangdong, China
| | - Paul B Fisher
- Department of Human & Molecular Genetics, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Institute of Molecular Medicine, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Massey Cancer Center, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States
| | - Xianjun Fang
- Department of Biochemistry & Molecular Biology, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States
| | - Xiang-Yang Wang
- Department of Human & Molecular Genetics, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Institute of Molecular Medicine, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Massey Cancer Center, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States.
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71
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Adaptive endoplasmic reticulum stress signalling via IRE1α-XBP1 preserves self-renewal of haematopoietic and pre-leukaemic stem cells. Nat Cell Biol 2019; 21:328-337. [PMID: 30778220 DOI: 10.1038/s41556-019-0285-6] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 01/14/2019] [Indexed: 12/17/2022]
Abstract
Over their lifetime, long-term haematopoietic stem cells (HSC) are exposed to a variety of stress conditions that they must endure. Many stresses, such as infection/inflammation, reactive oxygen species, nutritional deprivation and hypoxia, activate unfolded protein response signalling, which induces either adaptive changes to resolve the stress or apoptosis to clear the damaged cell. Whether unfolded-protein-response signalling plays any role in HSC regulation remains to be established. Here, we report that the adaptive signalling of the unfolded protein response, IRE1α-XBP1, protects HSCs from endoplasmic reticulum stress-induced apoptosis. IRE1α knockout leads to reduced reconstitution of HSCs. Furthermore, we show that oncogenic N-RasG12D activates IRE1α-XBP1, through MEK-GSK3β, to promote HSC survival under endoplasmic reticulum stress. Inhibiting IRE1α-XBP1 abolished N-RasG12D-mediated survival under endoplasmic reticulum stress and diminished the competitive advantage of NrasG12D HSCs in transplant recipients. Our studies illuminate how the adaptive endoplasmic reticulum stress response is advantageous in sustaining self-renewal of HSCs and promoting pre-leukaemic clonal dominance.
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72
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Inhibition of the IRE-1α/XBP-1 pathway prevents chronic GVHD and preserves the GVL effect in mice. Blood Adv 2019; 2:414-427. [PMID: 29483082 DOI: 10.1182/bloodadvances.2017009068] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Accepted: 02/02/2018] [Indexed: 01/07/2023] Open
Abstract
Hematopoietic stem cell transplantation (HCT) is a curative procedure for hematological malignancies, but chronic graft-versus-host disease (cGVHD) remains a major complication after allogeneic HCT. Because donor B cells are essential for cGVHD development and B cells are sensitive to endoplasmic reticulum (ER) stress, we hypothesized that the IRE-1α/XBP-1 pathway is required for B-cell activation and function and for the development of cGVHD. To test this hypothesis, we used conditional knock-out mice deficient of XBP-1 specifically in B cells. Recipients transplanted with donor grafts containing XBP-1-deficient B cells displayed reduced cGVHD compared with controls. Reduction of cGVHD correlated with impaired B-cell functions, including reduced production of anti-double-stranded DNA immunoglobulin G antibodies, CD86, Fas, and GL7 surface expression, and impaired T-cell responses, including reduced interferon-γ production and follicular helper T cells. In a bronchiolitis obliterans cGVHD model, recipients of transplants containing XBP-1-deficient B cells demonstrated improved pulmonary function correlated with reduced donor splenic follicular helper T cells and increased B cells compared with those of wild-type control donor grafts. We then tested if XBP-1 blockade via an IRE-1α inhibitor, B-I09, would attenuate cGVHD and preserve the graft-versus-leukemia (GVL) effect. In a cutaneous cGVHD model, we found that prophylactic administration of B-I09 reduced clinical features of cGVHD, which correlated with reductions in donor T-cell and dendritic cell skin infiltrates. Inhibition of the IRE-1α/XBP-1 pathway also preserved the GVL effect against chronic myelogenous leukemia mediated by allogeneic splenocytes. Collectively, the ER stress response mediated by the IRE-1α/XBP-1 axis is required for cGVHD development but dispensable for GVL activity.
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73
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Song M, Cubillos-Ruiz JR. Endoplasmic Reticulum Stress Responses in Intratumoral Immune Cells: Implications for Cancer Immunotherapy. Trends Immunol 2019; 40:128-141. [DOI: 10.1016/j.it.2018.12.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 11/28/2018] [Accepted: 12/04/2018] [Indexed: 01/08/2023]
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74
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Excessive Oxidative Stress Contributes to Increased Acute ER Stress Kidney Injury in Aged Mice. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:2746521. [PMID: 30809321 PMCID: PMC6369482 DOI: 10.1155/2019/2746521] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 09/30/2018] [Accepted: 11/13/2018] [Indexed: 12/28/2022]
Abstract
The aged kidney is susceptible to acute injury due presumably to its decreased ability to handle additional challenges, such as endoplasmic reticulum (ER) stress. This was tested by giving tunicamycin, an ER stress inducer, to either old or young mice. Injection of high dose caused renal failure in old mice, not in young mice. Moreover, injection of low dose resulted in severe renal damage in old mice, confirming the increased susceptibility of aged kidney to ER stress. There existed an abnormality in ER stress response kinetics in aged kidney, characterized by a loss of XBP-1 splicing and decreased PERK-eIF2α phosphorylation at late time point. The presence of excessive oxidative stress in aged kidney may play a role since high levels of oxidation increased ER stress-induced cell death and decreased IRE1 levels and XBP-1 splicing. Importantly, treatment with antioxidants protected old mice from kidney injury and normalized IRE1 and XBP-1 responses. Furthermore, older mice (6 months old) transgenic with antioxidative stress AGER1 were protected from ER stress-induced kidney injury. In conclusion, the decreased ability to handle ER stress, partly due to the presence of excessive oxidative stress, may contribute to increased susceptibility of the aging kidney to acute injury.
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75
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IRE1α-XBP1s pathway promotes prostate cancer by activating c-MYC signaling. Nat Commun 2019; 10:323. [PMID: 30679434 PMCID: PMC6345973 DOI: 10.1038/s41467-018-08152-3] [Citation(s) in RCA: 144] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 12/07/2018] [Indexed: 01/08/2023] Open
Abstract
Activation of endoplasmic reticulum (ER) stress/the unfolded protein response (UPR) has been linked to cancer, but the molecular mechanisms are poorly understood and there is a paucity of reagents to translate this for cancer therapy. Here, we report that an IRE1α RNase-specific inhibitor, MKC8866, strongly inhibits prostate cancer (PCa) tumor growth as monotherapy in multiple preclinical models in mice and shows synergistic antitumor effects with current PCa drugs. Interestingly, global transcriptomic analysis reveal that IRE1α-XBP1s pathway activity is required for c-MYC signaling, one of the most highly activated oncogenic pathways in PCa. XBP1s is necessary for optimal c-MYC mRNA and protein expression, establishing, for the first time, a direct link between UPR and oncogene activation. In addition, an XBP1-specific gene expression signature is strongly associated with PCa prognosis. Our data establish IRE1α-XBP1s signaling as a central pathway in PCa and indicate that its targeting may offer novel treatment strategies. ER stress and UPR are implicated in various cancers. Here, the authors show that one of the canonical UPR pathways, IRE1α-XBP1 regulates c-MYC signaling to promote prostate tumorigenesis, and pharmacological inhibition of IRE1α with MKC8866 inhibits prostate cancer growth and synergizes with clinically used prostate cancer drugs.
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76
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Govindarajan S, Gaublomme D, Van der Cruyssen R, Verheugen E, Van Gassen S, Saeys Y, Tavernier S, Iwawaki T, Bloch Y, Savvides SN, Lambrecht BN, Janssens S, Elewaut D, Drennan MB. Stabilization of cytokine mRNAs in iNKT cells requires the serine-threonine kinase IRE1alpha. Nat Commun 2018; 9:5340. [PMID: 30559399 PMCID: PMC6297233 DOI: 10.1038/s41467-018-07758-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Accepted: 11/21/2018] [Indexed: 01/10/2023] Open
Abstract
Activated invariant natural killer T (iNKT) cells rapidly produce large amounts of cytokines, but how cytokine mRNAs are induced, stabilized and mobilized following iNKT activation is still unclear. Here we show that an endoplasmic reticulum stress sensor, inositol-requiring enzyme 1α (IRE1α), links key cellular processes required for iNKT cell effector functions in specific iNKT subsets, in which TCR-dependent activation of IRE1α is associated with downstream activation of p38 MAPK and the stabilization of preformed cytokine mRNAs. Importantly, genetic deletion of IRE1α in iNKT cells reduces cytokine production and protects mice from oxazolone colitis. We therefore propose that an IRE1α-dependent signaling cascade couples constitutive cytokine mRNA expression to the rapid induction of cytokine secretion and effector functions in activated iNKT cells. Invariant natural killer T (iNKT) cells rapidly enhance cytokine secretion and effector function following activation, but the underlying mechanism is still unclear. Here the authors show that an endoplasmic reticulum stress sensor, inositol-requiring enzyme 1α, activates the p38 kinase to stabilize cytokine mRNA for enhanced iNKT functions.
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Affiliation(s)
- Srinath Govindarajan
- Unit for Molecular Immunology and Inflammation, VIB Center for Inflammation Research, Technologiepark 927, 9052, Zwijnaarde (Ghent), Belgium.,Department of Rheumatology, Ghent University, Ghent University Hospital, Ghent, 9000, Belgium
| | - Djoere Gaublomme
- Unit for Molecular Immunology and Inflammation, VIB Center for Inflammation Research, Technologiepark 927, 9052, Zwijnaarde (Ghent), Belgium.,Department of Rheumatology, Ghent University, Ghent University Hospital, Ghent, 9000, Belgium
| | - Renée Van der Cruyssen
- Unit for Molecular Immunology and Inflammation, VIB Center for Inflammation Research, Technologiepark 927, 9052, Zwijnaarde (Ghent), Belgium.,Department of Rheumatology, Ghent University, Ghent University Hospital, Ghent, 9000, Belgium
| | - Eveline Verheugen
- Unit for Molecular Immunology and Inflammation, VIB Center for Inflammation Research, Technologiepark 927, 9052, Zwijnaarde (Ghent), Belgium.,Department of Rheumatology, Ghent University, Ghent University Hospital, Ghent, 9000, Belgium
| | - Sofie Van Gassen
- Department of Applied Mathematics, Computer Science and Statistics, Ghent University, Ghent, 9000, Belgium.,Data Mining and Modeling for Biomedicine, VIB Center for Inflammation Research, Technologiepark 927, 9052, Zwijnaarde (Ghent), Belgium
| | - Yvan Saeys
- Department of Applied Mathematics, Computer Science and Statistics, Ghent University, Ghent, 9000, Belgium.,Data Mining and Modeling for Biomedicine, VIB Center for Inflammation Research, Technologiepark 927, 9052, Zwijnaarde (Ghent), Belgium
| | - Simon Tavernier
- Laboratory of Immunoregulation and Mucosal Immunology, VIB Center for Inflammation Research, Technologiepark 927, 9052 Zwijnaarde (Ghent), Belgium.,Department of Respiratory Medicine, Ghent University, Ghent University Hospital, 9000, Ghent, Belgium
| | - Takao Iwawaki
- Division of Cell Medicine, Department of Life Science, Medical Research Institute, Kanazawa Medical University, Kanazawa, 920-0856, Japan
| | - Yehudi Bloch
- Unit for Structural Biology, Department of Biochemistry and Microbiology, Ghent University, Technologiepark 927, 9052, Zwijnaarde (Ghent), Belgium.,Unit for Structural Biology, VIB Center for Inflammation Research, Technologiepark 927, 9052, Zwijnaarde, (Ghent), Belgium
| | - Savvas N Savvides
- Unit for Structural Biology, Department of Biochemistry and Microbiology, Ghent University, Technologiepark 927, 9052, Zwijnaarde (Ghent), Belgium.,Unit for Structural Biology, VIB Center for Inflammation Research, Technologiepark 927, 9052, Zwijnaarde, (Ghent), Belgium
| | - Bart N Lambrecht
- Laboratory of Immunoregulation and Mucosal Immunology, VIB Center for Inflammation Research, Technologiepark 927, 9052 Zwijnaarde (Ghent), Belgium.,Department of Respiratory Medicine, Ghent University, Ghent University Hospital, 9000, Ghent, Belgium.,Department of Pulmonary Medicine, Ghent University, ErasmusMC, Rotterdam, 2040, Netherlands
| | - Sophie Janssens
- Laboratory of ER Stress and Inflammation, VIB Center for Inflammation Research, Technologiepark 927, 9052, Zwijnaarde (Ghent), Belgium.,Department of Internal Medicine and Pediatrics, Ghent University, Ghent, 9000, Belgium
| | - Dirk Elewaut
- Unit for Molecular Immunology and Inflammation, VIB Center for Inflammation Research, Technologiepark 927, 9052, Zwijnaarde (Ghent), Belgium. .,Department of Rheumatology, Ghent University, Ghent University Hospital, Ghent, 9000, Belgium.
| | - Michael B Drennan
- Unit for Molecular Immunology and Inflammation, VIB Center for Inflammation Research, Technologiepark 927, 9052, Zwijnaarde (Ghent), Belgium.,Department of Rheumatology, Ghent University, Ghent University Hospital, Ghent, 9000, Belgium
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77
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Betts BC, Locke FL, Sagatys EM, Pidala J, Walton K, Menges M, Reff J, Saha A, Djeu JY, Kiluk JV, Lee MC, Kim J, Kang CW, Tang CH, Frieling J, Lynch CC, List A, Rodriguez PC, Blazar BR, Conejo-Garcia JR, Del Valle JR, Hu CC, Anasetti C. Inhibition of Human Dendritic Cell ER Stress Response Reduces T Cell Alloreactivity Yet Spares Donor Anti-tumor Immunity. Front Immunol 2018; 9:2887. [PMID: 30574153 PMCID: PMC6291501 DOI: 10.3389/fimmu.2018.02887] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 11/26/2018] [Indexed: 11/13/2022] Open
Abstract
Acute graft- vs. -host disease (GVHD) is an important cause of morbidity and death after allogeneic hematopoietic cell transplantation (HCT). We identify a new approach to prevent GVHD that impairs monocyte-derived dendritic cell (moDC) alloactivation of T cells, yet preserves graft- vs.-leukemia (GVL). Exceeding endoplasmic reticulum (ER) capacity results in a spliced form of X-box binding protein-1 (XBP-1s). XBP-1s mediates ER stress and inflammatory responses. We demonstrate that siRNA targeting XBP-1 in moDCs abrogates their stimulation of allogeneic T cells. B-I09, an inositol-requiring enzyme-1α (IRE1α) inhibitor that prevents XBP-1 splicing, reduces human moDC migration, allo-stimulatory potency, and curtails moDC IL-1β, TGFβ, and p40 cytokines, suppressing Th1 and Th17 cell priming. B-I09-treated moDCs reduce responder T cell activation via calcium flux without interfering with regulatory T cell (Treg) function or GVL effects by cytotoxic T lymphocytes (CTL) and NK cells. In a human T cell mediated xenogeneic GVHD model, B-I09 inhibition of XBP-1s reduced target-organ damage and pathogenic Th1 and Th17 cells without impacting donor Tregs or anti-tumor CTL. DC XBP-1s inhibition provides an innovative strategy to prevent GVHD and retain GVL.
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Affiliation(s)
- Brian C Betts
- Department of Blood and Marrow Transplantation and Cellular Immunotherapy, Tampa, FL, United States.,Department of Immunology, Moffitt Cancer Center, Tampa, FL, United States.,Division of Hematology, Oncology, and Transplantation, University of Minnesota, Minneapolis, MN, United States
| | - Frederick L Locke
- Department of Blood and Marrow Transplantation and Cellular Immunotherapy, Tampa, FL, United States.,Department of Immunology, Moffitt Cancer Center, Tampa, FL, United States
| | - Elizabeth M Sagatys
- Department of Hematopathology and Laboratory Medicine, Moffitt Cancer Center, Tampa, FL, United States
| | - Joseph Pidala
- Department of Blood and Marrow Transplantation and Cellular Immunotherapy, Tampa, FL, United States.,Department of Immunology, Moffitt Cancer Center, Tampa, FL, United States
| | - Kelly Walton
- Department of Immunology, Moffitt Cancer Center, Tampa, FL, United States.,Division of Hematology, Oncology, and Transplantation, University of Minnesota, Minneapolis, MN, United States
| | - Meghan Menges
- Department of Immunology, Moffitt Cancer Center, Tampa, FL, United States
| | - Jordan Reff
- Department of Immunology, Moffitt Cancer Center, Tampa, FL, United States
| | - Asim Saha
- Division of Blood and Marrow Transplantation, Department of Pediatrics, Masonic Cancer Center, University of Minnesota, Minneapolis, MN, United States.,The Center for Immunology, University of Minnesota Medical School, Minneapolis, MN, United States
| | - Julie Y Djeu
- Department of Immunology, Moffitt Cancer Center, Tampa, FL, United States
| | - John V Kiluk
- Comprehensive Breast Program, Moffitt Cancer Center, Tampa, FL, United States
| | - Marie C Lee
- Comprehensive Breast Program, Moffitt Cancer Center, Tampa, FL, United States
| | - Jongphil Kim
- Department of Biostatistics and Bioinformatics, Moffitt Cancer Center, Tampa, FL, United States
| | - Chang Won Kang
- Department of Chemistry, University of South Florida, Tampa, FL, United States
| | - Chih-Hang Tang
- Department of Translational Tumor Immunology, The Wistar Institute, Philadelphia, PA, United States
| | - Jeremy Frieling
- Department of Tumor Biology, Moffitt Cancer Center, Tampa, FL, United States
| | - Conor C Lynch
- Department of Tumor Biology, Moffitt Cancer Center, Tampa, FL, United States
| | - Alan List
- Department of Malignant Hematology, Moffitt Cancer Center, Tampa, FL, United States
| | - Paulo C Rodriguez
- Department of Immunology, Moffitt Cancer Center, Tampa, FL, United States
| | - Bruce R Blazar
- Division of Blood and Marrow Transplantation, Department of Pediatrics, Masonic Cancer Center, University of Minnesota, Minneapolis, MN, United States.,The Center for Immunology, University of Minnesota Medical School, Minneapolis, MN, United States
| | | | - Juan R Del Valle
- Department of Chemistry, University of South Florida, Tampa, FL, United States
| | - Chih-Chi Hu
- Department of Translational Tumor Immunology, The Wistar Institute, Philadelphia, PA, United States
| | - Claudio Anasetti
- Department of Blood and Marrow Transplantation and Cellular Immunotherapy, Tampa, FL, United States.,Department of Immunology, Moffitt Cancer Center, Tampa, FL, United States
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78
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Obiedat A, Seidel E, Mahameed M, Berhani O, Tsukerman P, Voutetakis K, Chatziioannou A, McMahon M, Avril T, Chevet E, Mandelboim O, Tirosh B. Transcription of the NKG2D ligand MICA is suppressed by the IRE1/XBP1 pathway of the unfolded protein response through the regulation of E2F1. FASEB J 2018; 33:3481-3495. [PMID: 30452881 DOI: 10.1096/fj.201801350rr] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The unfolded protein response (UPR) is an adaptive signaling pathway activated in response to endoplasmic reticulum (ER) stress. The effectors of the UPR are potent transcription activators; however, some genes are suppressed by ER stress at the mRNA level. The mechanisms underlying UPR-mediated gene suppression are less known. Exploration of the effect of UPR on NK cells ligand expression found that the transcription of NK group 2 member D (NKG2D) ligand major histocompatibility complex class I polypeptide-related sequence A/B (MICA/B) is suppressed by the inositol-requiring enzyme 1 (IRE1)/X-box binding protein 1 (XBP1) pathway of the UPR. Deletion of IRE1 or XBP1 was sufficient to promote mRNA and surface levels of MICA. Accordingly, NKG2D played a greater role in the killing of IRE1/XBP1 knockout target cells. Analysis of effectors downstream to XBP1s identified E2F transcription factor 1 (E2F1) as linking UPR and MICA transcription. The inverse correlation between XBP1 and E2F1 or MICA expression was corroborated in RNA-Seq analysis of 470 primary melanoma tumors. While mechanisms that connect XBP1 to E2F1 are not fully understood, we implicate a few microRNA molecules that are modulated by ER stress and possess dual suppression of E2F1 and MICA. Because of the importance of E2F1 and MICA in cancer progression and recognition, these observations could be exploited for cancer therapy by manipulating the UPR in tumor cells.-Obiedat, A., Seidel, E., Mahameed, M., Berhani, O., Tsukerman, P., Voutetakis, K., Chatziioannou, A., McMahon, M., Avril, T., Chevet, E., Mandelboim, O., Tirosh, B. Transcription of the NKG2D ligand MICA is suppressed by the IRE1/XBP1 pathway of the unfolded protein response through the regulation of E2F1.
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Affiliation(s)
- Akram Obiedat
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Einat Seidel
- The Lautenberg Center for Immunology and Cancer Research, The Biomedical Research Institute Israel-Canada, Faculty of Medicine, The Hebrew University of Jerusalem Hadassah Medical School, Jerusalem, Israel
| | - Mohamed Mahameed
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Orit Berhani
- The Lautenberg Center for Immunology and Cancer Research, The Biomedical Research Institute Israel-Canada, Faculty of Medicine, The Hebrew University of Jerusalem Hadassah Medical School, Jerusalem, Israel
| | - Pinchas Tsukerman
- The Lautenberg Center for Immunology and Cancer Research, The Biomedical Research Institute Israel-Canada, Faculty of Medicine, The Hebrew University of Jerusalem Hadassah Medical School, Jerusalem, Israel
| | - Konstantinos Voutetakis
- Institute of Biology, Medicinal Chemistry and Biotechnology, National Hellenic Research Foundation (NHRF), Athens, Greece.,Department of Biochemistry and Biotechnology, University of Thessaly, Larissa, Greece
| | - Aristotelis Chatziioannou
- Institute of Biology, Medicinal Chemistry and Biotechnology, National Hellenic Research Foundation (NHRF), Athens, Greece.,e-Noesis Inspired Operational Systems Applications Private Company PC, Kallithea-Athens, Greece
| | - Mari McMahon
- INSERM U1242, University of Rennes, Rennes, France.,Centre de Lutte contre le Cancer Eugène Marquis, Rennes, France; and.,Apoptosis Research Centre (ARC), National University of Ireland, Galway (NUIG), Galway, Ireland
| | - Tony Avril
- INSERM U1242, University of Rennes, Rennes, France.,Centre de Lutte contre le Cancer Eugène Marquis, Rennes, France; and
| | - Eric Chevet
- INSERM U1242, University of Rennes, Rennes, France.,Centre de Lutte contre le Cancer Eugène Marquis, Rennes, France; and
| | - Ofer Mandelboim
- The Lautenberg Center for Immunology and Cancer Research, The Biomedical Research Institute Israel-Canada, Faculty of Medicine, The Hebrew University of Jerusalem Hadassah Medical School, Jerusalem, Israel
| | - Boaz Tirosh
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
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79
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CD19 Alterations Emerging after CD19-Directed Immunotherapy Cause Retention of the Misfolded Protein in the Endoplasmic Reticulum. Mol Cell Biol 2018; 38:MCB.00383-18. [PMID: 30104252 PMCID: PMC6189457 DOI: 10.1128/mcb.00383-18] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Accepted: 08/06/2018] [Indexed: 02/06/2023] Open
Abstract
We previously described a mechanism of acquired resistance of B-cell acute lymphoblastic leukemia to CD19-directed chimeric antigen receptor T-cell (CART) immunotherapy. It was based on in-frame insertions in or skipping of CD19 exon 2. To distinguish between epitope loss and defects in surface localization, we used retroviral transduction and genome editing to generate cell lines expressing CD19 exon 2 variants (CD19ex2vs) bearing vesicular stomatitis virus G protein (VSVg) tags. These lines were negative by live-cell flow cytometry with an anti-VSVg antibody and resistant to killing by VSVg-directed antibody-drug conjugates (ADCs), suggestive of a defect in surface localization. Indeed, pulse-chase and α-mannosidase inhibitor assays showed that all CD19ex2vs acquired endoplasmic reticulum (ER)-specific high-mannose-type sugars but not complex-type glycans synthesized in the Golgi apparatus. When fused with green fluorescent protein (GFP), CD19ex2vs (including a mutant lacking the relevant disulfide bond) showed colocalization with ER markers, implying protein misfolding. Mass spectrometric profiling of CD19-interacting proteins demonstrated that CD19ex2vs fail to bind to the key tetraspanin CD81 and instead interact with ER-resident chaperones, such as calnexin, and ER transporters involved in antigen presentation. Thus, even the intact domains of CD19ex2vs cannot be easily targeted with ADCs or current CD19 CARTs but could serve as sources of peptides for major histocompatibility complex (MHC)-restricted presentation and T-cell receptor (TCR)-mediated killing.
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80
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Moon HW, Han HG, Jeon YJ. Protein Quality Control in the Endoplasmic Reticulum and Cancer. Int J Mol Sci 2018; 19:E3020. [PMID: 30282948 PMCID: PMC6213883 DOI: 10.3390/ijms19103020] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2018] [Revised: 09/22/2018] [Accepted: 10/01/2018] [Indexed: 12/21/2022] Open
Abstract
The endoplasmic reticulum (ER) is an essential compartment of the biosynthesis, folding, assembly, and trafficking of secretory and transmembrane proteins, and consequently, eukaryotic cells possess specialized machineries to ensure that the ER enables the proteins to acquire adequate folding and maturation for maintaining protein homeostasis, a process which is termed proteostasis. However, a large variety of physiological and pathological perturbations lead to the accumulation of misfolded proteins in the ER, which is referred to as ER stress. To resolve ER stress and restore proteostasis, cells have evolutionary conserved protein quality-control machineries of the ER, consisting of the unfolded protein response (UPR) of the ER, ER-associated degradation (ERAD), and autophagy. Furthermore, protein quality-control machineries of the ER play pivotal roles in the control of differentiation, progression of cell cycle, inflammation, immunity, and aging. Therefore, severe and non-resolvable ER stress is closely associated with tumor development, aggressiveness, and response to therapies for cancer. In this review, we highlight current knowledge in the molecular understanding and physiological relevance of protein quality control of the ER and discuss new insights into how protein quality control of the ER is implicated in the pathogenesis of cancer, which could contribute to therapeutic intervention in cancer.
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Affiliation(s)
- Hye Won Moon
- Department of Biochemistry, Chungnam National University College of Medicine, Daejeon 35015, Korea.
- Department of Medical Science, Chungnam National University College of Medicine, Daejeon 35015, Korea.
| | - Hye Gyeong Han
- Department of Biochemistry, Chungnam National University College of Medicine, Daejeon 35015, Korea.
- Department of Medical Science, Chungnam National University College of Medicine, Daejeon 35015, Korea.
| | - Young Joo Jeon
- Department of Biochemistry, Chungnam National University College of Medicine, Daejeon 35015, Korea.
- Department of Medical Science, Chungnam National University College of Medicine, Daejeon 35015, Korea.
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81
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McGrath EP, Logue SE, Mnich K, Deegan S, Jäger R, Gorman AM, Samali A. The Unfolded Protein Response in Breast Cancer. Cancers (Basel) 2018; 10:cancers10100344. [PMID: 30248920 PMCID: PMC6211039 DOI: 10.3390/cancers10100344] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 09/12/2018] [Accepted: 09/18/2018] [Indexed: 01/18/2023] Open
Abstract
In 2018, in the US alone, it is estimated that 268,670 people will be diagnosed with breast cancer, and that 41,400 will die from it. Since breast cancers often become resistant to therapies, and certain breast cancers lack therapeutic targets, new approaches are urgently required. A cell-stress response pathway, the unfolded protein response (UPR), has emerged as a promising target for the development of novel breast cancer treatments. This pathway is activated in response to a disturbance in endoplasmic reticulum (ER) homeostasis but has diverse physiological and disease-specific functions. In breast cancer, UPR signalling promotes a malignant phenotype and can confer tumours with resistance to widely used therapies. Here, we review several roles for UPR signalling in breast cancer, highlighting UPR-mediated therapy resistance and the potential for targeting the UPR alone or in combination with existing therapies.
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Affiliation(s)
- Eoghan P McGrath
- Apoptosis Research Centre, National University of Ireland (NUI), Galway, University Road, Galway, H91 TK33 Galway, Ireland.
- School of Natural Sciences, NUI Galway, University Road, H91 TK33 Galway, Ireland.
| | - Susan E Logue
- Apoptosis Research Centre, National University of Ireland (NUI), Galway, University Road, Galway, H91 TK33 Galway, Ireland.
- School of Natural Sciences, NUI Galway, University Road, H91 TK33 Galway, Ireland.
| | - Katarzyna Mnich
- Apoptosis Research Centre, National University of Ireland (NUI), Galway, University Road, Galway, H91 TK33 Galway, Ireland.
- School of Natural Sciences, NUI Galway, University Road, H91 TK33 Galway, Ireland.
| | - Shane Deegan
- Apoptosis Research Centre, National University of Ireland (NUI), Galway, University Road, Galway, H91 TK33 Galway, Ireland.
- School of Natural Sciences, NUI Galway, University Road, H91 TK33 Galway, Ireland.
| | - Richard Jäger
- Department of Natural Sciences, Bonn-Rhein-Sieg University of Applied Sciences, 53359 Rheinbach, Germany.
| | - Adrienne M Gorman
- Apoptosis Research Centre, National University of Ireland (NUI), Galway, University Road, Galway, H91 TK33 Galway, Ireland.
- School of Natural Sciences, NUI Galway, University Road, H91 TK33 Galway, Ireland.
| | - Afshin Samali
- Apoptosis Research Centre, National University of Ireland (NUI), Galway, University Road, Galway, H91 TK33 Galway, Ireland.
- School of Natural Sciences, NUI Galway, University Road, H91 TK33 Galway, Ireland.
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82
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Tavernier Q, Bennana E, Poindessous V, Schaeffer C, Rampoldi L, Pietrancosta N, Pallet N. Regulation of IRE1 RNase activity by the Ribonuclease inhibitor 1 (RNH1). Cell Cycle 2018; 17:1901-1916. [PMID: 30109813 DOI: 10.1080/15384101.2018.1506655] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Abstract
Adaptation to endoplasmic reticulum (ER) stress depends on the activation of the sensor inositol-requiring enzyme 1α (IRE1), an endoribonuclease that splices the mRNA of the transcription factor XBP1 (X-box-binding protein 1). To better understand the protein network that regulates the activity of the IRE1 pathway, we systematically screened the proteins that interact with IRE1 and identified a ribonuclease inhibitor called ribonuclease/angiogenin inhibitor 1 (RNH1). RNH1 is a leucine-rich repeat domains-containing protein that binds to and inhibits ribonucleases. Immunoprecipitation experiments confirmed this interaction. Docking experiments indicated that RNH1 physically interacts with IRE1 through its cytosolic RNase domain. Upon ER stress, the interaction of RNH1 with IRE1 in the ER increased at the expense of the nuclear pool of RNH1. Inhibition of RNH1 expression using siRNA mediated RNA interference upon ER stress led to an increased splicing activity of XBP1. Modulation of IRE1 RNase activity by RNH1 was recapitulated in a cell-free system, suggesting direct regulation of IRE1 by RNH. We conclude that RNH1 attenuates the activity of IRE1 by interacting with its ribonuclease domain. These findings have implications for understanding the molecular mechanism by which IRE1 signaling is attenuated upon ER stress.
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Affiliation(s)
- Quentin Tavernier
- a Institut National de la Santé et de la Recherche Médicale (INSERM) U1147 , Paris , France.,b Paris Descartes University , Paris , France
| | - Evangeline Bennana
- b Paris Descartes University , Paris , France.,c 3P5 Proteomic facility, COMUE Sorbonne Paris Cité , Université Paris Descartes , Paris , France
| | - Virginie Poindessous
- a Institut National de la Santé et de la Recherche Médicale (INSERM) U1147 , Paris , France.,b Paris Descartes University , Paris , France
| | - Celine Schaeffer
- d Molecular Genetics of Renal Disorders Unit, Division of Genetics and Cell Biology , IRCCS San Raffaele Scientific Institute , Milan , Italy
| | - Luca Rampoldi
- d Molecular Genetics of Renal Disorders Unit, Division of Genetics and Cell Biology , IRCCS San Raffaele Scientific Institute , Milan , Italy
| | - Nicolas Pietrancosta
- b Paris Descartes University , Paris , France.,e Centre National pour la Recherche Scientifique (CNRS) U8601 , Paris , France.,f Team Chemistry and Biology, Modeling & Immunology for Therapy , CBMIT, 2MI Platform , Paris , France
| | - Nicolas Pallet
- a Institut National de la Santé et de la Recherche Médicale (INSERM) U1147 , Paris , France.,b Paris Descartes University , Paris , France.,g Clinical Chemistry Department , Hôpital Européen Gorges Pompidou, APHP , Paris , France.,h Plate-forme Proteomique 3P5 , Universite Paris Descartes, Sorbonne Paris Cite , Paris , France
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83
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Yang Z, Zhang J, Jiang D, Khatri P, Solow-Cordero DE, Toesca DAS, Koumenis C, Denko NC, Giaccia AJ, Le QT, Koong AC. A Human Genome-Wide RNAi Screen Reveals Diverse Modulators that Mediate IRE1α-XBP1 Activation. Mol Cancer Res 2018; 16:745-753. [PMID: 29440447 PMCID: PMC5932228 DOI: 10.1158/1541-7786.mcr-17-0307] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 11/02/2017] [Accepted: 02/05/2018] [Indexed: 11/16/2022]
Abstract
Activation of the unfolded protein response (UPR) signaling pathways is linked to multiple human diseases, including cancer. The inositol-requiring kinase 1α (IRE1α)-X-box binding protein 1 (XBP1) pathway is the most evolutionarily conserved of the three major signaling branches of the UPR. Here, we performed a genome-wide siRNA screen to obtain a systematic assessment of genes integrated in the IRE1α-XBP1 axis. We monitored the expression of an XBP1-luciferase chimeric protein in which luciferase was fused in-frame with the spliced (active) form of XBP1. Using cells expressing this reporter construct, we identified 162 genes for which siRNA inhibition resulted in alteration in XBP1 splicing. These genes express diverse types of proteins modulating a wide range of cellular processes. Pathway analysis identified a set of genes implicated in the pathogenesis of breast cancer. Several genes, including BCL10, GCLM, and IGF1R, correlated with worse relapse-free survival (RFS) in an analysis of patients with triple-negative breast cancer (TNBC). However, in this cohort of 1,908 patients, only high GCLM expression correlated with worse RFS in both TNBC and non-TNBC patients. Altogether, our study revealed unidentified roles of novel pathways regulating the UPR, and these findings may serve as a paradigm for exploring novel therapeutic opportunities based on modulating the UPR.Implications: Genome-wide RNAi screen identifies novel genes/pathways that modulate IRE1α-XBP1 signaling in human tumor cells and leads to the development of improved therapeutic approaches targeting the UPR.Visual Overview: http://mcr.aacrjournals.org/content/molcanres/16/5/745/F1.large.jpg Mol Cancer Res; 16(5); 745-53. ©2018 AACR.
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Affiliation(s)
- Zhifen Yang
- Department of Radiation Oncology, Stanford University, Stanford, California
| | - Jing Zhang
- Department of Radiation Oncology, Stanford University, Stanford, California
| | - Dadi Jiang
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Purvesh Khatri
- Institute for Immunity, Transplantation and Infection, and Biomedical Informatics Research, Department of Medicine, Stanford University, Stanford, California
| | - David E Solow-Cordero
- High-Throughput Bioscience Center, Department of Chemical and Systems Biology, Stanford University, Stanford, California
| | - Diego A S Toesca
- Department of Radiation Oncology, Stanford University, Stanford, California
| | - Constantinos Koumenis
- Department of Radiation Oncology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania
| | - Nicholas C Denko
- Department of Radiation Oncology, The Ohio State University, Columbus, Ohio
| | - Amato J Giaccia
- Department of Radiation Oncology, Stanford University, Stanford, California
| | - Quynh-Thu Le
- Department of Radiation Oncology, Stanford University, Stanford, California
| | - Albert C Koong
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas.
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84
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Tang CH, Chang S, Hashimoto A, Chen YJ, Kang CW, Mato AR, Del Valle JR, Gabrilovich DI, Hu CC. Secretory IgM Exacerbates Tumor Progression by Inducing Accumulations of MDSCs in Mice. Cancer Immunol Res 2018; 6:696-710. [PMID: 29650518 DOI: 10.1158/2326-6066.cir-17-0582] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Revised: 02/06/2018] [Accepted: 04/05/2018] [Indexed: 12/15/2022]
Abstract
Chronic lymphocytic leukemia (CLL) cells can secrete immunoglobulin M. However, it is not clear whether secretory IgM (sIgM) plays a role in disease progression. We crossed the Eμ-TCL1 mouse model of CLL, in which the expression of human TCL1 oncogene was driven by the V(H) promoter-Ig(H)-Eμ enhancer, with MD4 mice whose B cells produced B-cell receptor (membrane-bound IgM) and sIgM with specificity for hen egg lysozyme (HEL). CLL cells that developed in these MD4/Eμ-TCL1 mice reactivated a parental Ig gene allele and secreted IgM, and did not recognize HEL. The MD4/Eμ-TCL1 mice had reduced survival, increased myeloid-derived suppressor cells (MDSC), and decreased numbers of T cells. We tested whether sIgM could contribute to the accumulation of MDSCs by crossing μS-/- mice, which could not produce sIgM, with Eμ-TCL1 mice. The μS-/-/Eμ-TCL1 mice survived longer than Eμ-TCL1 mice and developed decreased numbers of MDSCs which were less able to suppress proliferation of T cells. We targeted the synthesis of sIgM by deleting the function of XBP-1s and showed that targeting XBP-1s genetically or pharmacologically could lead to decreased sIgM, accompanied by decreased numbers and reduced functions of MDSCs in MD4/Eμ-TCL1 mice. Additionally, MDSCs from μS-/- mice grafted with Lewis lung carcinoma were inefficient suppressors of T cells, resulting in slower tumor growth. These results demonstrate that sIgM produced by B cells can upregulate the functions of MDSCs in tumor-bearing mice to aggravate cancer progression. In a mouse model of CLL, production of secretory IgM led to more MDSCs, fewer T cells, and shorter survival times for the mice. Thus, secretory IgM may aggravate the progression of this cancer. Cancer Immunol Res; 6(6); 696-710. ©2018 AACR.
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Affiliation(s)
| | - Shiun Chang
- The Wistar Institute, Philadelphia, Pennsylvania
| | | | - Yi-Ju Chen
- The Wistar Institute, Philadelphia, Pennsylvania
| | - Chang Won Kang
- Department of Chemistry, University of South Florida, Tampa, Florida
| | - Anthony R Mato
- Center for CLL, Abramson Cancer Center, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Juan R Del Valle
- Department of Chemistry, University of South Florida, Tampa, Florida
| | | | - Chih-Chi Hu
- The Wistar Institute, Philadelphia, Pennsylvania.
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85
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Tang CHA, Chang S, Paton AW, Paton JC, Gabrilovich DI, Ploegh HL, Del Valle JR, Hu CCA. Phosphorylation of IRE1 at S729 regulates RIDD in B cells and antibody production after immunization. J Cell Biol 2018; 217:1739-1755. [PMID: 29511123 PMCID: PMC5940306 DOI: 10.1083/jcb.201709137] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 01/23/2018] [Accepted: 02/07/2018] [Indexed: 01/16/2023] Open
Abstract
Phosphorylation of IRE1 at S729 enhances splicing of XBP1 messenger RNA and regulates RIDD. lipopolysaccharide-stimulated plasmablasts from S729A knock-in mice fail to boost spliced XBP1 in response to ER stress. Such mice exhibit plasma cells with decreased numbers and altered functions after immunization. To relieve endoplasmic reticulum (ER) stress, IRE1 splices XBP1 messenger RNA (mRNA) or engages regulated IRE1-dependent decay (RIDD) of other mRNAs. Upon XBP1 deficiency, IRE1 switches to perform RIDD. We examined IRE1 in XBP1-deficient B cells and discovered that IRE1 undergoes phosphorylation at S729. We generated an anti–phospho-S729 antibody to investigate such phosphorylation. Compared with pharmacological ER stress inducers or Toll-like receptor ligands, the bacterial subtilase cytotoxin has an unusual capability in causing rapid and strong phosphorylation at S729 and triggering B cells to express spliced XBP1. To assess the function of S729 in IRE1, we generated S729A knock-in mice and found S729 is critically important for lipopolysaccharide-stimulated plasmablasts to respond to additional ER stress and for antibody production in response to immunization. We further crossed mice carrying an S729A mutation or ΔIRE1 (missing the kinase domain) with B cell–specific XBP1-deficient mice to trigger RIDD and discovered a critical role for S729 in regulating RIDD in B cells.
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Affiliation(s)
| | | | - Adrienne W Paton
- Department of Molecular and Cellular Biology, Research Centre for Infectious Diseases, University of Adelaide, Adelaide, Australia
| | - James C Paton
- Department of Molecular and Cellular Biology, Research Centre for Infectious Diseases, University of Adelaide, Adelaide, Australia
| | | | - Hidde L Ploegh
- Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA
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86
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Xie H, Tang CHA, Song JH, Mancuso A, Del Valle JR, Cao J, Xiang Y, Dang CV, Lan R, Sanchez DJ, Keith B, Hu CCA, Simon MC. IRE1α RNase-dependent lipid homeostasis promotes survival in Myc-transformed cancers. J Clin Invest 2018; 128:1300-1316. [PMID: 29381485 DOI: 10.1172/jci95864] [Citation(s) in RCA: 89] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Accepted: 01/16/2018] [Indexed: 12/14/2022] Open
Abstract
Myc activation is a primary oncogenic event in many human cancers; however, these transcription factors are difficult to inhibit pharmacologically, suggesting that Myc-dependent downstream effectors may be more tractable therapeutic targets. Here, we show that Myc overexpression induces endoplasmic reticulum (ER) stress and engages the inositol-requiring enzyme 1α (IRE1α)/X-box binding protein 1 (XBP1) pathway through multiple molecular mechanisms in a variety of c-Myc- and N-Myc-dependent cancers. In particular, Myc-overexpressing cells require IRE1α/XBP1 signaling for sustained growth and survival in vitro and in vivo, dependent on elevated stearoyl-CoA-desaturase 1 (SCD1) activity. Pharmacological and genetic XBP1 inhibition induces Myc-dependent apoptosis, which is alleviated by exogenous unsaturated fatty acids. Of note, SCD1 inhibition phenocopies IRE1α RNase activity suppression in vivo. Furthermore, IRE1α inhibition enhances the cytotoxic effects of standard chemotherapy drugs used to treat c-Myc-overexpressing Burkitt's lymphoma, suggesting that inhibiting the IRE1α/XBP1 pathway is a useful general strategy for treatment of Myc-driven cancers.
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Affiliation(s)
- Hong Xie
- Abramson Family Cancer Research Institute and.,Department of Cancer Biology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | | | - Jun H Song
- Abramson Family Cancer Research Institute and.,Department of Cell and Developmental Biology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | | | - Juan R Del Valle
- Department of Chemistry, University of South Florida, Tampa, Florida, USA
| | - Jin Cao
- Department of Molecular and Cellular Biology.,Lester and Sue Smith Breast Center, and.,Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas, USA
| | - Yan Xiang
- Abramson Family Cancer Research Institute and
| | - Chi V Dang
- Abramson Family Cancer Research Institute and
| | - Roy Lan
- Abramson Family Cancer Research Institute and
| | - Danielle J Sanchez
- Abramson Family Cancer Research Institute and.,Department of Cell and Developmental Biology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Brian Keith
- Abramson Family Cancer Research Institute and.,Department of Cancer Biology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | | | - M Celeste Simon
- Abramson Family Cancer Research Institute and.,Department of Cell and Developmental Biology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
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87
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Zhao N, Cao J, Xu L, Tang Q, Dobrolecki LE, Lv X, Talukdar M, Lu Y, Wang X, Hu DZ, Shi Q, Xiang Y, Wang Y, Liu X, Bu W, Jiang Y, Li M, Gong Y, Sun Z, Ying H, Yuan B, Lin X, Feng XH, Hartig SM, Li F, Shen H, Chen Y, Han L, Zeng Q, Patterson JB, Kaipparettu BA, Putluri N, Sicheri F, Rosen JM, Lewis MT, Chen X. Pharmacological targeting of MYC-regulated IRE1/XBP1 pathway suppresses MYC-driven breast cancer. J Clin Invest 2018; 128:1283-1299. [PMID: 29480818 DOI: 10.1172/jci95873] [Citation(s) in RCA: 143] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Accepted: 01/16/2018] [Indexed: 12/20/2022] Open
Abstract
The unfolded protein response (UPR) is a cellular homeostatic mechanism that is activated in many human cancers and plays pivotal roles in tumor progression and therapy resistance. However, the molecular mechanisms for UPR activation and regulation in cancer cells remain elusive. Here, we show that oncogenic MYC regulates the inositol-requiring enzyme 1 (IRE1)/X-box binding protein 1 (XBP1) branch of the UPR in breast cancer via multiple mechanisms. We found that MYC directly controls IRE1 transcription by binding to its promoter and enhancer. Furthermore, MYC forms a transcriptional complex with XBP1, a target of IRE1, and enhances its transcriptional activity. Importantly, we demonstrate that XBP1 is a synthetic lethal partner of MYC. Silencing of XBP1 selectively blocked the growth of MYC-hyperactivated cells. Pharmacological inhibition of IRE1 RNase activity with small molecule inhibitor 8866 selectively restrained the MYC-overexpressing tumor growth in vivo in a cohort of preclinical patient-derived xenograft models and genetically engineered mouse models. Strikingly, 8866 substantially enhanced the efficacy of docetaxel chemotherapy, resulting in rapid regression of MYC-overexpressing tumors. Collectively, these data establish the synthetic lethal interaction of the IRE1/XBP1 pathway with MYC hyperactivation and provide a potential therapy for MYC-driven human breast cancers.
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Affiliation(s)
- Na Zhao
- Department of Molecular and Cellular Biology.,Lester and Sue Smith Breast Center, and.,Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas, USA
| | - Jin Cao
- Department of Molecular and Cellular Biology.,Lester and Sue Smith Breast Center, and.,Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas, USA
| | - Longyong Xu
- Department of Molecular and Cellular Biology.,Lester and Sue Smith Breast Center, and.,Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas, USA
| | - Qianzi Tang
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, China
| | - Lacey E Dobrolecki
- Department of Molecular and Cellular Biology.,Lester and Sue Smith Breast Center, and.,Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas, USA
| | - Xiangdong Lv
- Department of Molecular and Cellular Biology.,Lester and Sue Smith Breast Center, and.,Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas, USA
| | - Manisha Talukdar
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
| | - Yang Lu
- Department of Molecular and Cellular Biology.,Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas, USA
| | - Xiaoran Wang
- Department of Molecular and Cellular Biology.,Lester and Sue Smith Breast Center, and.,Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas, USA
| | - Dorothy Z Hu
- Harvard School of Dental Medicine, Boston, Massachusetts, USA
| | - Qing Shi
- Department of Molecular and Cellular Biology.,Lester and Sue Smith Breast Center, and.,Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas, USA
| | - Yu Xiang
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston McGovern Medical School, Houston, Texas, USA
| | - Yunfei Wang
- Department of Bioinformatics and Computational Biology, University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Xia Liu
- Department of Molecular and Cellular Biology.,Lester and Sue Smith Breast Center, and.,Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas, USA
| | - Wen Bu
- Department of Molecular and Cellular Biology.,Lester and Sue Smith Breast Center, and
| | - Yi Jiang
- Division of Biochemical Genetics, Baylor Genetics, Houston, Texas, USA
| | - Mingzhou Li
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, China
| | - Yingyun Gong
- Department of Molecular and Cellular Biology.,Division of Diabetes, Endocrinology and Metabolism, Department of Medicine, Baylor College of Medicine, Houston, Texas, USA
| | - Zheng Sun
- Department of Molecular and Cellular Biology.,Division of Diabetes, Endocrinology and Metabolism, Department of Medicine, Baylor College of Medicine, Houston, Texas, USA
| | - Haoqiang Ying
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Bo Yuan
- Life Sciences Institute and Innovation Center for Cell Signaling Network, Zhejiang University, Hangzhou, Zhejiang, China
| | - Xia Lin
- Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, Texas, USA
| | - Xin-Hua Feng
- Department of Molecular and Cellular Biology.,Life Sciences Institute and Innovation Center for Cell Signaling Network, Zhejiang University, Hangzhou, Zhejiang, China.,Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, Texas, USA
| | | | - Feng Li
- Department of Molecular and Cellular Biology
| | - Haifa Shen
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas, USA
| | - Yiwen Chen
- Department of Bioinformatics and Computational Biology, University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Leng Han
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston McGovern Medical School, Houston, Texas, USA
| | - Qingping Zeng
- Fosun Orinove PharmaTech Inc., Suzhou, Jiangsu, China
| | | | | | | | - Frank Sicheri
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada.,Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada
| | - Jeffrey M Rosen
- Department of Molecular and Cellular Biology.,Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas, USA
| | - Michael T Lewis
- Department of Molecular and Cellular Biology.,Lester and Sue Smith Breast Center, and.,Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas, USA
| | - Xi Chen
- Department of Molecular and Cellular Biology.,Lester and Sue Smith Breast Center, and.,Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas, USA
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88
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Interplay between P-Glycoprotein Expression and Resistance to Endoplasmic Reticulum Stressors. Molecules 2018; 23:molecules23020337. [PMID: 29415493 PMCID: PMC6017601 DOI: 10.3390/molecules23020337] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2018] [Revised: 01/30/2018] [Accepted: 02/01/2018] [Indexed: 12/13/2022] Open
Abstract
Multidrug resistance (MDR) is a phenotype of cancer cells with reduced sensitivity to a wide range of unrelated drugs. P-glycoprotein (P-gp)—a drug efflux pump (ABCB1 member of the ABC transporter gene family)—is frequently observed to be a molecular cause of MDR. The drug-efflux activity of P-gp is considered as the underlying mechanism of drug resistance against P-gp substrates and results in failure of cancer chemotherapy. Several pathological impulses such as shortages of oxygen and glucose supply, alterations of calcium storage mechanisms and/or processes of protein N-glycosylation in the endoplasmic reticulum (ER) leads to ER stress (ERS), characterized by elevation of unfolded protein cell content and activation of the unfolded protein response (UPR). UPR is responsible for modification of protein folding pathways, removal of misfolded proteins by ER associated protein degradation (ERAD) and inhibition of proteosynthesis. However, sustained ERS may result in UPR-mediated cell death. Neoplastic cells could escape from the death pathway induced by ERS by switching UPR into pro survival mechanisms instead of apoptosis. Here, we aimed to present state of the art information about consequences of P-gp expression on mechanisms associated with ERS development and regulation of the ERAD system, particularly focused on advances in ERS-associated therapy of drug resistant malignancies.
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89
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Yoo YS, Han HG, Jeon YJ. Unfolded Protein Response of the Endoplasmic Reticulum in Tumor Progression and Immunogenicity. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:2969271. [PMID: 29430279 PMCID: PMC5752989 DOI: 10.1155/2017/2969271] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 11/29/2017] [Indexed: 12/11/2022]
Abstract
The endoplasmic reticulum (ER) is a pivotal regulator of folding, quality control, trafficking, and targeting of secreted and transmembrane proteins, and accordingly, eukaryotic cells have evolved specialized machinery to ensure that the ER enables these proteins to acquire adequate folding and maturation in the presence of intrinsic and extrinsic insults. This adaptive capacity of the ER to intrinsic and extrinsic perturbations is important for maintaining protein homeostasis, which is termed proteostasis. Failure in adaptation to these perturbations leads to accumulation of misfolded or unassembled proteins in the ER, which is termed ER stress, resulting in the activation of unfolded protein response (UPR) of the ER and the execution of ER-associated degradation (ERAD) to restore homeostasis. Furthermore, both of the two axes play key roles in the control of tumor progression, inflammation, immunity, and aging. Therefore, understanding UPR of the ER and subsequent ERAD will provide new insights into the pathogenesis of many human diseases and contribute to therapeutic intervention in these diseases.
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Affiliation(s)
- Yoon Seon Yoo
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon 35015, Republic of Korea
- Department of Medical Science, Chungnam National University School of Medicine, Daejeon 35015, Republic of Korea
| | - Hye Gyeong Han
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon 35015, Republic of Korea
- Department of Medical Science, Chungnam National University School of Medicine, Daejeon 35015, Republic of Korea
| | - Young Joo Jeon
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon 35015, Republic of Korea
- Department of Medical Science, Chungnam National University School of Medicine, Daejeon 35015, Republic of Korea
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90
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Piszcz J, Armitage EG, Ferrarini A, Rupérez FJ, Kulczynska A, Bolkun L, Kloczko J, Kretowski A, Urbanowicz A, Ciborowski M, Barbas C. To treat or not to treat: metabolomics reveals biomarkers for treatment indication in chronic lymphocytic leukaemia patients. Oncotarget 2017; 7:22324-38. [PMID: 26988915 PMCID: PMC5008363 DOI: 10.18632/oncotarget.8078] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 02/23/2016] [Indexed: 11/25/2022] Open
Abstract
In chronic lymphocytic leukaemia (CLL), the clinical course of patients is heterogeneous. Some present an aggressive disease onset and require immediate therapy, while others remain without treatment for years. Current disease staging systems developed by Rai and Binet may be useful in forecasting patient survival time, but do not discriminate between stable and progressive forms of the disease in the early stages. Recently ample attention has been directed towards identifying new disease prognostic markers capable of predicting clinical aggressiveness at diagnosis. In the present study serum samples from stable (n = 51) and progressive (n = 42) CLL patients and controls (n = 45) were used with aim to discover metabolic indicators of disease status. First an LC-MS based metabolic fingerprinting method was used to analyse selected samples in order to find a potential markers discriminating aggressive from indolent patients. Ten of these discovered markers were validated on the whole set of samples with an independent analytical technique. Linoleamide (p = 0.002) in addition to various acylcarnitines (p = 0.001-0.000001) showed to be significant markers of CLL in its aggressive form. Acetylcarnitine (p = 0.05) and hexannoylcarnitine (p = 0.005) were also distinguishable markers of indolent subjects. Forming a panel of selected acylcarnitines and fatty acid amides, it was possible to reach a potentially highly specific and sensitive diagnostic approach (AUC = 0.766).
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Affiliation(s)
- Jaroslaw Piszcz
- Department of Haematology, Medical University of Bialystok, Bialystok, Poland
| | - Emily G Armitage
- CEMBIO, Centre for Metabolomics and Bioanalysis, San Pablo CEU University, Madrid, Spain
| | - Alessia Ferrarini
- CEMBIO, Centre for Metabolomics and Bioanalysis, San Pablo CEU University, Madrid, Spain
| | - Francisco J Rupérez
- CEMBIO, Centre for Metabolomics and Bioanalysis, San Pablo CEU University, Madrid, Spain
| | | | - Lukasz Bolkun
- Department of Haematology, Medical University of Bialystok, Bialystok, Poland
| | - Janusz Kloczko
- Department of Haematology, Medical University of Bialystok, Bialystok, Poland
| | - Adam Kretowski
- Clinical Research Centre, Medical University of Bialystok, Bialystok, Poland
| | - Alina Urbanowicz
- Clinical Oncology and Hematology Department, Provincial Hospital, Suwalki, Poland
| | - Michal Ciborowski
- Clinical Research Centre, Medical University of Bialystok, Bialystok, Poland
| | - Coral Barbas
- CEMBIO, Centre for Metabolomics and Bioanalysis, San Pablo CEU University, Madrid, Spain
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91
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Jeong SO, Son Y, Lee JH, Choi SW, Kim SH, Cheong YK, Chung HT, Pae HO. Both nitric oxide and nitrite prevent homocysteine-induced endoplasmic reticulum stress and subsequent apoptosis via cGMP-dependent pathway in neuronal cells. Biochem Biophys Res Commun 2017; 493:164-169. [PMID: 28917840 DOI: 10.1016/j.bbrc.2017.09.054] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 09/12/2017] [Indexed: 01/05/2023]
Abstract
Growing evidence indicates that endoplasmic reticulum (ER) stress and/or ER stress-mediated apoptosis may play a role in the pathogenesis of neurodegenerative diseases such as Alzheimer's disease. The present study investigated the effects of non-cytotoxic concentrations of nitric oxide (NO) and nitrite, a metabolite of NO, on ER stress and ER stress-mediated apoptosis in Neuro-2a cells exposed to homocysteine (Hcy), an endogenous ER stress inducer. Hcy induced ER stress, as confirmed by inositol-requiring enzyme 1α (IRE1α) phosphorylation and X-box-binding protein-1 (Xbp1) mRNA splicing as well as C/EBP homologous protein (CHOP) expression, and apoptosis, as verified by Annexin V-positive cells. Surprisingly, non-cytotoxic NO (S-nitrosoglutathione) and nitrite markedly reduced Hcy-induced IRE1α phosphorylation, Xbp1 mRNA splicing, CHOP expression, and Annexin V-positive cells, indicating the cytoprotection of NO and nitrite against Hcy-induced ER stress and apoptosis. Moreover, inhibition of sGC/cGMP pathway abolished the cytoprotective effects of NO and nitrite, whereas cellular elevation of cGMP levels mimicked the cytoprotective actions of NO and nitrite. These findings provide the first evidence showing that both NO and nitrite can reduce ER stress and subsequent apoptosis via NO-sGC-cGMP pathway in neuronal cells and suggesting that NO and/or nitrite may have therapeutic value in the treatment of ER stress-associated neurodegenerative diseases.
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Affiliation(s)
- Sun-Oh Jeong
- Department of Microbiology and Immunology, Wonkwang University School of Medicine, 460 Iksandae-ro, Iksan 54538, Republic of Korea
| | - Yong Son
- Department of Anesthesiology and Pain Medicine, Wonkwang University School of Medicine, 460 Iksandae-ro, Iksan 54538, Republic of Korea
| | - Ju Hwan Lee
- Department of Anesthesiology and Pain Medicine, Wonkwang University School of Medicine, 460 Iksandae-ro, Iksan 54538, Republic of Korea
| | - Seung Won Choi
- Department of Anesthesiology and Pain Medicine, Wonkwang University School of Medicine, 460 Iksandae-ro, Iksan 54538, Republic of Korea
| | - Sung Hun Kim
- Department of Anesthesiology and Pain Medicine, Wonkwang University School of Medicine, 460 Iksandae-ro, Iksan 54538, Republic of Korea
| | - Yong-Kwan Cheong
- Department of Anesthesiology and Pain Medicine, Wonkwang University School of Medicine, 460 Iksandae-ro, Iksan 54538, Republic of Korea
| | - Hun-Taeg Chung
- Department of Biological Science, University of Ulsan, 30 Daehack-ro, Ulsan 44610, Republic of Korea.
| | - Hyun-Ock Pae
- Department of Microbiology and Immunology, Wonkwang University School of Medicine, 460 Iksandae-ro, Iksan 54538, Republic of Korea.
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92
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Song YF, Hogstrand C, Wei CC, Wu K, Pan YX, Luo Z. Endoplasmic reticulum (ER) stress and cAMP/PKA pathway mediated Zn-induced hepatic lipolysis. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 228:256-264. [PMID: 28549333 DOI: 10.1016/j.envpol.2017.05.046] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 05/05/2017] [Accepted: 05/17/2017] [Indexed: 05/25/2023]
Abstract
The present study was performed to determine the effect of Zn exposure influencing endoplasmic reticulum (ER) stress, explore the underlying molecular mechanism of Zn-induced hepatic lipolysis in a fish species of significance for aquaculture, yellow catfish Pelteobagrus fulvidraco. We found that waterborne Zn exposure evoked ER stress and unfolded protein response (UPR), and activated cAMP/PKA pathway, and up-regulated hepatic lipolysis. The increase in ER stress and lipolysis were associated with activation of cAMP/PKA signaling pathway. Zn also induced an increase in intracellular Ca2+ level, which could be partially prevented by dantrolene (RyR receptor inhibitor) and 2-APB (IP3 receptor inhibitor), demonstrating that the disturbed Ca2+ homeostasis in ER contributed to ER stress and dysregulation of lipolysis. Inhibition of ER stress by PBA attenuated UPR, inhibited the activation of cAMP/PKA pathway and resulted in down-regulation of lipolysis. Inhibition of protein kinase RNA-activated-like ER kinase (PERK) by GSK2656157 and inositol-requiring enzyme (IRE) by STF-083010 differentially influenced Zn-induced changes of lipid metabolism, indicating that PERK and IRE pathways played different regulatory roles in Zn-induced lipolysis. Inhibition of PKA by H89 blocked the Zn-induced activation of cAMP/PKA pathway with a concomitant inhibition of ER stress-mediated lipolysis. Taken together, our findings highlight the importance of the ER stress-cAMP/PKA axis in Zn-induced lipolysis, which provides new insights into Zn toxicology in fish and probably in other vertebrates.
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Affiliation(s)
- Yu-Feng Song
- Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Fishery College, Huazhong Agricultural University, Wuhan 430070, China
| | - Christer Hogstrand
- Diabetes and Nutritional Sciences Division, School of Medicine, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London, SE1 9NH, UK
| | - Chuan-Chuan Wei
- Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Fishery College, Huazhong Agricultural University, Wuhan 430070, China
| | - Kun Wu
- Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Fishery College, Huazhong Agricultural University, Wuhan 430070, China
| | - Ya-Xiong Pan
- Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Fishery College, Huazhong Agricultural University, Wuhan 430070, China
| | - Zhi Luo
- Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Fishery College, Huazhong Agricultural University, Wuhan 430070, China; Collaborative Innovation Center for Efficient and Health Production of Fisheries in Hunan Province, Changde 415000, China.
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93
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Chae CS, Teran-Cabanillas E, Cubillos-Ruiz JR. Dendritic cell rehab: new strategies to unleash therapeutic immunity in ovarian cancer. Cancer Immunol Immunother 2017; 66:969-977. [PMID: 28214928 PMCID: PMC11028950 DOI: 10.1007/s00262-017-1958-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Accepted: 01/18/2017] [Indexed: 01/04/2023]
Abstract
Immune-based therapies that induce remarkable and durable responses against melanoma and lung cancer have unfortunately demonstrated limited success in ovarian cancer patients. This is likely due to the exceptional immunoregulatory nature of ovarian tumors, which employ numerous strategies to effectively suppress anti-tumor immunity. Here, we summarize a decade of research indicating that ovarian cancers possess an exquisite capacity to subvert the activity of host dendritic cells (DCs) as a key mechanism to impede the development and maintenance of protective T cell-based immune responses. Identifying, understanding, and disabling the precise mechanisms promoting DC dysfunction in ovarian cancer are, therefore, fundamental requirements for devising the next generation of successful immunotherapies against this devastating malignancy.
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Affiliation(s)
- Chang-Suk Chae
- Department of Obstetrics and Gynecology, Weill Cornell Medicine, New York, NY, USA
- Sandra and Edward Meyer Cancer Center, Weill Cornell Medicine, New York, NY, USA
| | - Eli Teran-Cabanillas
- Department of Obstetrics and Gynecology, Weill Cornell Medicine, New York, NY, USA
- Sandra and Edward Meyer Cancer Center, Weill Cornell Medicine, New York, NY, USA
- School of Nutrition Sciences, Autonomous University of Sinaloa, Culiacán, SIN, Mexico
| | - Juan R Cubillos-Ruiz
- Department of Obstetrics and Gynecology, Weill Cornell Medicine, New York, NY, USA.
- Sandra and Edward Meyer Cancer Center, Weill Cornell Medicine, New York, NY, USA.
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94
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Kishino A, Hayashi K, Hidai C, Masuda T, Nomura Y, Oshima T. XBP1-FoxO1 interaction regulates ER stress-induced autophagy in auditory cells. Sci Rep 2017; 7:4442. [PMID: 28667325 PMCID: PMC5493624 DOI: 10.1038/s41598-017-02960-1] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Accepted: 04/21/2017] [Indexed: 01/07/2023] Open
Abstract
The purpose of this study was to clarify the relationship among X-box-binding protein 1 unspliced, spliced (XBP1u, s), Forkhead box O1 (FoxO1) and autophagy in the auditory cells under endoplasmic reticulum (ER) stress. In addition, the relationship between ER stress that causes unfolded protein response (UPR) and autophagy was also investigated. The present study reported ER stress induction by tunicamycin treatment that resulted in IRE1α-mediated XBP1 mRNA splicing and autophagy. XBP1 mRNA splicing and FoxO1 were found to be involved in ER stress-induced autophagy. This inference was based on the observation that the expression of LC3-II was suppressed by knockdown of IRE1α, XBP1 or FoxO1. In addition, XBP1u was found to interact with XBP1s in auditory cells under ER stress, functioning as a negative feedback regulator that was based on two important findings. Firstly, there was a significant inverse correlation between XBP1u and XBP1s expressions, and secondly, the expression of XBP1 protein showed different dynamics compared to the XBP1 mRNA level. Furthermore, our results regarding the relationship between XBP1 and FoxO1 by small interfering RNA (siRNA) paradoxically showed negative regulation of FoxO1 expression by XBP1. Our findings revealed that the XBP1-FoxO1 interaction regulated the ER stress-induced autophagy in auditory cells.
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Affiliation(s)
- Akihiro Kishino
- Department of Otolaryngology, School of Medicine, Nihon University, Tokyo, 173-8610, Japan
| | - Ken Hayashi
- Department of Otolaryngology, Kamio Memorial Hospital, Tokyo, 101-0063, Japan
| | - Chiaki Hidai
- Department of Physiology, School of Medicine, Nihon University, Tokyo, 173-8610, Japan
| | - Takeshi Masuda
- Department of Otolaryngology, School of Medicine, Nihon University, Tokyo, 173-8610, Japan
| | - Yasuyuki Nomura
- Department of Otolaryngology, School of Medicine, Nihon University, Tokyo, 173-8610, Japan
| | - Takeshi Oshima
- Department of Otolaryngology, School of Medicine, Nihon University, Tokyo, 173-8610, Japan.
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95
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Bellezza I, Scarpelli P, Pizzo SV, Grottelli S, Costanzi E, Minelli A. ROS-independent Nrf2 activation in prostate cancer. Oncotarget 2017; 8:67506-67518. [PMID: 28978049 PMCID: PMC5620189 DOI: 10.18632/oncotarget.18724] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 05/23/2017] [Indexed: 12/16/2022] Open
Abstract
In prostate cancer, oxidative stress and the subsequent Nrf2 activation promote the survival of cancer cells and acquired chemoresistance. Nrf2 links prostate cancer to endoplasmic reticulum stress, an event that triggers the unfolded protein response, aiming to restore cellular homeostasis as well as an adaptive survival mechanism. Glucose-regulated protein of 78 kD /immunoglobulin heavy chain binding protein (GRP78/BiP) is a key molecular chaperone in the endoplasmic reticulum that, when expressed at the cell surface, acts as a receptor for several signaling pathways enhancing antiapoptotic and proliferative signals. We showed GRP78/BiP translocation to PC3 cell surface in the presence of tunicamycin, an ER stress inductor, and demonstrated the existence of a GRP78/BiP-dependent non-canonical Nrf2 activation, responsible for increased resistance to ER-stress induced apoptosis. We found that, even in the absence of ROS production, tunicamycin causes Nrf2 activation, and activates Akt signaling, events bulnted by anti-GRP78/BiP antibody treatment. The presence of GRP78/BiP at the cell surface might be exploited for the immunotherapeutic strategy of prostate cancer since its blockage by anti-GRP78/BiP antibodies might promote cancer death by suppressing some of the several molecular protective mechanisms found in aggressive cancer cells.
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Affiliation(s)
- Ilaria Bellezza
- Department of Experimental Medicine, University of Perugia, Perugia, Italy
| | - Paolo Scarpelli
- Department of Experimental Medicine, University of Perugia, Perugia, Italy
| | | | - Silvia Grottelli
- Department of Experimental Medicine, University of Perugia, Perugia, Italy
| | - Egidia Costanzi
- Department of Experimental Medicine, University of Perugia, Perugia, Italy
| | - Alba Minelli
- Department of Experimental Medicine, University of Perugia, Perugia, Italy
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96
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Amengual JE, Prabhu SA, Lombardo M, Zullo K, Johannet PM, Gonzalez Y, Scotto L, Serrano XJ, Wei Y, Duong J, Nandakumar R, Cremers S, Verma A, Elemento O, O'Connor OA. Mechanisms of Acquired Drug Resistance to the HDAC6 Selective Inhibitor Ricolinostat Reveals Rational Drug-Drug Combination with Ibrutinib. Clin Cancer Res 2017; 23:3084-3096. [PMID: 27993968 PMCID: PMC5474138 DOI: 10.1158/1078-0432.ccr-16-2022] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 11/22/2016] [Accepted: 11/23/2016] [Indexed: 12/31/2022]
Abstract
Purpose: Pan-class I/II histone deacetylase (HDAC) inhibitors are effective treatments for select lymphomas. Isoform-selective HDAC inhibitors are emerging as potentially more targeted agents. ACY-1215 (ricolinostat) is a first-in-class selective HDAC6 inhibitor. To better understand the discrete function of HDAC6 and its role in lymphoma, we developed a lymphoma cell line resistant to ACY-1215.Experimental Design: The diffuse large B-cell lymphoma cell line OCI-Ly10 was exposed to increasing concentrations of ACY-1215 over an extended period of time, leading to the development of a resistant cell line. Gene expression profiling (GEP) was performed to investigate differentially expressed genes. Combination studies of ACY-1215 and ibrutinib were performed in cell lines, primary human lymphoma tissue, and a xenograft mouse model.Results: Systematic incremental increases in drug exposure led to the development of distinct resistant cell lines with IC50 values 10- to 20-fold greater than that for parental lines. GEP revealed upregulation of MAPK10, HELIOS, HDAC9, and FYN, as well as downregulation of SH3BP5 and LCK. Gene-set enrichment analysis (GSEA) revealed modulation of the BTK pathway. Ibrutinib was found to be synergistic with ACY-1215 in cell lines as well as in 3 primary patient samples of lymphoma. In vivo confirmation of antitumor synergy was demonstrated with a xenograft of DLBCL.Conclusions: The development of this ACY-1215-resistant cell line has provided valuable insights into the mechanistic role of HDAC6 in lymphoma and offered a novel method to identify rational synergistic drug combinations. Translation of these findings to the clinic is underway. Clin Cancer Res; 23(12); 3084-96. ©2016 AACR.
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Affiliation(s)
- Jennifer E Amengual
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York.
| | - Sathyen A Prabhu
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York
| | - Maximilian Lombardo
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York
| | - Kelly Zullo
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York
| | - Paul M Johannet
- Stanford University School of Medicine, Stanford, California
| | - Yulissa Gonzalez
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York
| | - Luigi Scotto
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York
| | - Xavier Jirau Serrano
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York
| | - Ying Wei
- Department of Biostatistics, Mailman School of Public Health, Columbia University, New York, New York
| | - Jimmy Duong
- Department of Biostatistics, Mailman School of Public Health, Columbia University, New York, New York
| | - Renu Nandakumar
- Division of Clinical Pathology, Department of Pathology and Cell Biology, Columbia University Medical Center, New York, New York
| | - Serge Cremers
- Division of Clinical Pathology, Department of Pathology and Cell Biology, Columbia University Medical Center, New York, New York
| | - Akanksha Verma
- Institute for Computational Biomedicine, Weill Cornell Medical College, New York, New York
| | - Olivier Elemento
- Institute for Computational Biomedicine, Weill Cornell Medical College, New York, New York
| | - Owen A O'Connor
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York
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97
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Mohamed E, Cao Y, Rodriguez PC. Endoplasmic reticulum stress regulates tumor growth and anti-tumor immunity: a promising opportunity for cancer immunotherapy. Cancer Immunol Immunother 2017; 66:1069-1078. [PMID: 28577085 DOI: 10.1007/s00262-017-2019-6] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 05/14/2017] [Indexed: 11/30/2022]
Abstract
The endoplasmic reticulum (ER) stress is a cellular process that occurs as a consequence of several stress circumstances, such as the accumulation of unfolded proteins in the lumen of the ER or distinct insults that disturb the ER normal function. Different conditions in the tumor microenvironment (TME), including hypoxia, nutrient deprivation, and the elevated production of reactive oxygen and nitrogen species destabilize the loading and dispatching of the newly synthesized proteins, triggering ER stress in cancer cells and tumor-infiltrating leukocytes. In order to cope with TME-induced ER stress, tumor and stromal cells initiate an adaptive response process that aims to resolve ER stress and to restore cellular homeostasis, which is referred as the unfolded protein responses (UPR). Paradoxically, the UPR can also induce cell death under severe and/or permanent ER stress. The UPR is started through three mediators, the activation of the inositol-requiring enzyme-1α, the pancreatic ER kinase-like ER kinase, and the activating transcription factor 6. In this minireview, we will discuss the pro- and anti-tumorigenic role of the UPR in cancer cells. In addition, we will describe the effects of the TME-induced ER stress in the immunosuppressive activity of tumor-infiltrating myeloid cells. Also, we will review the results of emerging therapeutic interventions that target ER stress and the UPR mediators in cancer. We postulate that the inhibition of ER stress or the UPR-related elements could represent a significant approach to increase the efficacy of various forms of cancer immunotherapy.
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Affiliation(s)
- Eslam Mohamed
- Georgia Cancer Center, Medical College of Georgia, Augusta University, 1410 Laney Walker Blvd, Room CN-4125A, Augusta, GA, 30912, USA.
| | - Yu Cao
- Georgia Cancer Center, Medical College of Georgia, Augusta University, 1410 Laney Walker Blvd, Room CN-4125A, Augusta, GA, 30912, USA
| | - Paulo C Rodriguez
- Department of Medicine, Georgia Cancer Center, Augusta University, 1410 Laney Walker Blvd, Room CN-4114, Augusta, GA, 30912, USA.
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98
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Pinkaew D, Chattopadhyay A, King MD, Chunhacha P, Liu Z, Stevenson HL, Chen Y, Sinthujaroen P, McDougal OM, Fujise K. Fortilin binds IRE1α and prevents ER stress from signaling apoptotic cell death. Nat Commun 2017; 8:18. [PMID: 28550308 PMCID: PMC5446404 DOI: 10.1038/s41467-017-00029-1] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Accepted: 04/05/2017] [Indexed: 12/19/2022] Open
Abstract
The endoplasmic reticulum, the cytoplasmic organelle that matures a massive amount of nascent secretory polypeptides, is particularly sensitive to stress. Endoplasmic reticulum stress causes unfolded proteins to populate the organelle, eliciting the unfolded protein response. During the unfolded protein response, GRP78—an endoplasmic reticulum master stress regulator—detaches from three endoplasmic reticulum stress sensors (IRE1α, PERK, and ATF6) and allows them to activate the apoptotic signaling pathway. Fortilin, a pro-survival molecule, is known to inhibit apoptosis by binding and inhibiting p53, but its role in endoplasmic reticulum stress-induced apoptosis remains unknown. Here, we report that fortilin directly interacts with the cytoplasmic domain of IRE1α, inhibits both kinase and endoribonuclease (RNase) activities of the stress sensor, and protects cells against apoptotic cell death at both cellular and whole animal levels. Our data support a role of fortilin in the unfolded protein response and its potential participation in human diseases caused by unfolded protein response. IRE1α is an ER stress sensor, whose activity induces apoptosis. Here, the authors report that fortilin, a pro-survival factor, with yet unknown roles in ER stress, interacts with active IRE1α, inhibits both its kinase end RNase activities, and protects cells from apoptosis both in vitro and in vivo.
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Affiliation(s)
- Decha Pinkaew
- Division of Cardiology, Department of Internal Medicine, University of Texas Medical Branch at Galveston, Galveston, Texas, 77555, USA
| | - Abhijnan Chattopadhyay
- Division of Cardiology, Department of Internal Medicine, University of Texas Medical Branch at Galveston, Galveston, Texas, 77555, USA.,Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, Galveston, Texas, 77555, USA
| | - Matthew D King
- Department of Chemistry and Biochemistry, Boise State University, Boise, Idaho, 83725, USA
| | - Preedakorn Chunhacha
- Division of Cardiology, Department of Internal Medicine, University of Texas Medical Branch at Galveston, Galveston, Texas, 77555, USA
| | - Zhihe Liu
- Division of Cardiology, Department of Internal Medicine, University of Texas Medical Branch at Galveston, Galveston, Texas, 77555, USA
| | - Heather L Stevenson
- Department of Pathology, University of Texas Medical Branch at Galveston, Galveston, Texas, 77555, USA.,The Institute of Translational Sciences, University of Texas Medical Branch at Galveston, Galveston, Texas, 77555, USA
| | - Yanjie Chen
- Division of Cardiology, Department of Internal Medicine, University of Texas Medical Branch at Galveston, Galveston, Texas, 77555, USA
| | - Patuma Sinthujaroen
- Division of Cardiology, Department of Internal Medicine, University of Texas Medical Branch at Galveston, Galveston, Texas, 77555, USA
| | - Owen M McDougal
- Department of Chemistry and Biochemistry, Boise State University, Boise, Idaho, 83725, USA
| | - Ken Fujise
- Division of Cardiology, Department of Internal Medicine, University of Texas Medical Branch at Galveston, Galveston, Texas, 77555, USA. .,Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, Galveston, Texas, 77555, USA. .,The Institute of Translational Sciences, University of Texas Medical Branch at Galveston, Galveston, Texas, 77555, USA.
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99
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Cubillos-Ruiz JR, Bettigole SE, Glimcher LH. Tumorigenic and Immunosuppressive Effects of Endoplasmic Reticulum Stress in Cancer. Cell 2017; 168:692-706. [PMID: 28187289 DOI: 10.1016/j.cell.2016.12.004] [Citation(s) in RCA: 564] [Impact Index Per Article: 80.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 11/29/2016] [Accepted: 12/01/2016] [Indexed: 12/13/2022]
Abstract
Malignant cells utilize diverse strategies that enable them to thrive under adverse conditions while simultaneously inhibiting the development of anti-tumor immune responses. Hostile microenvironmental conditions within tumor masses, such as nutrient deprivation, oxygen limitation, high metabolic demand, and oxidative stress, disturb the protein-folding capacity of the endoplasmic reticulum (ER), thereby provoking a cellular state of "ER stress." Sustained activation of ER stress sensors endows malignant cells with greater tumorigenic, metastatic, and drug-resistant capacity. Additionally, recent studies have uncovered that ER stress responses further impede the development of protective anti-cancer immunity by manipulating the function of myeloid cells in the tumor microenvironment. Here, we discuss the tumorigenic and immunoregulatory effects of ER stress in cancer, and we explore the concept of targeting ER stress responses to enhance the efficacy of standard chemotherapies and evolving cancer immunotherapies in the clinic.
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Affiliation(s)
- Juan R Cubillos-Ruiz
- Department of Obstetrics and Gynecology, Weill Cornell Medicine, New York, NY 10065, USA; Sandra and Edward Meyer Cancer Center, Weill Cornell Medicine, New York, NY 10065, USA.
| | | | - Laurie H Glimcher
- Department of Medicine, Harvard Medical School and Brigham and Women's Hospital, Boston, MA 02215, USA; Department of Cancer Immunology and Virology, Dana-Farber Cancer Institute, Boston, MA 02215, USA.
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100
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Regulated IRE1-dependent mRNA decay sets the threshold for dendritic cell survival. Nat Cell Biol 2017; 19:698-710. [PMID: 28459443 DOI: 10.1038/ncb3518] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 03/21/2017] [Indexed: 12/23/2022]
Abstract
The IRE1-XBP1 signalling pathway is part of a cellular programme that protects against endoplasmic reticulum (ER) stress, but also controls development and survival of immune cells. Loss of XBP1 in splenic type 1 conventional dendritic cells (cDC1s) results in functional alterations without affecting cell survival. However, in mucosal cDC1s, loss of XBP1 impaired survival in a tissue-specific manner-while lung cDC1s die, intestinal cDC1s survive. This was not caused by differential activation of ER stress cell-death regulators CHOP or JNK. Rather, survival of intestinal cDC1s was associated with their ability to shut down protein synthesis through a protective integrated stress response and their marked increase in regulated IRE1-dependent messenger RNA decay. Furthermore, loss of IRE1 endonuclease on top of XBP1 led to cDC1 loss in the intestine. Thus, mucosal DCs differentially mount ATF4- and IRE1-dependent adaptive mechanisms to survive in the face of ER stress.
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