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Mohamud Yusuf A, Borbor M, Hussner T, Weghs C, Kaltwasser B, Pillath-Eilers M, Walkenfort B, Kolesnick R, Gulbins E, Hermann DM, Brockmeier U. Acid sphingomyelinase inhibition induces cerebral angiogenesis post-ischemia/reperfusion in an oxidative stress-dependent way and promotes endothelial survival by regulating mitochondrial metabolism. Cell Death Dis 2024; 15:650. [PMID: 39231943 PMCID: PMC11374893 DOI: 10.1038/s41419-024-06935-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 07/16/2024] [Accepted: 07/22/2024] [Indexed: 09/06/2024]
Abstract
Acid sphingomyelinase (ASM) inhibitors are widely used for the treatment of post-stroke depression. They promote neurological recovery in animal stroke models via neurorestorative effects. In a previous study, we found that antidepressants including amitriptyline, fluoxetine, and desipramine increase cerebral angiogenesis post-ischemia/reperfusion (I/R) in an ASM-dependent way. To elucidate the underlying mechanisms, we investigated the effects of the functional ASM inhibitor amitriptyline in two models of I/R injury, that is, in human cerebral microvascular endothelial hCMEC/D3 cells exposed to oxygen-glucose deprivation and in mice exposed to middle cerebral artery occlusion (MCAO). In addition to our earlier studies, we now show that amitriptyline increased mitochondrial reactive oxygen species (ROS) formation in hCMEC/D3 cells and increased ROS formation in the vascular compartment of MCAO mice. ROS formation was instrumental for amitriptyline's angiogenic effects. ROS formation did not result in excessive endothelial injury. Instead, amitriptyline induced a profound metabolic reprogramming of endothelial cells that comprised reduced endothelial proliferation, reduced mitochondrial energy metabolism, reduced endoplasmic reticulum stress, increased autophagy/mitophagy, stimulation of antioxidant responses and inhibition of apoptotic cell death. Specifically, the antioxidant heme oxygenase-1, which was upregulated by amitriptyline, mediated amitriptyline's angiogenic effects. Thus, heme oxygenase-1 knockdown severely compromised angiogenesis and abolished amitriptyline's angiogenic responses. Our data demonstrate that ASM inhibition reregulates a complex network of metabolic and mitochondrial responses post-I/R that contribute to cerebral angiogenesis without compromising endothelial survival.
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Affiliation(s)
- Ayan Mohamud Yusuf
- Department of Neurology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Mina Borbor
- Department of Neurology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Tanja Hussner
- Department of Neurology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Carolin Weghs
- Department of Neurology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Britta Kaltwasser
- Department of Neurology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Matthias Pillath-Eilers
- Department of Neurology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Bernd Walkenfort
- Imaging Center Essen (Electron Microscopy), University Hospital Essen, University Duisburg-Essen, Essen, Germany
| | | | - Erich Gulbins
- Department of Molecular Biology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Dirk M Hermann
- Department of Neurology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
| | - Ulf Brockmeier
- Department of Neurology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
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Yang S, Hu C, Chen X, Tang Y, Li J, Yang H, Yang Y, Ying B, Xiao X, Li SZ, Gu L, Zhu Y. Crosstalk between metabolism and cell death in tumorigenesis. Mol Cancer 2024; 23:71. [PMID: 38575922 PMCID: PMC10993426 DOI: 10.1186/s12943-024-01977-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Accepted: 03/02/2024] [Indexed: 04/06/2024] Open
Abstract
It is generally recognized that tumor cells proliferate more rapidly than normal cells. Due to such an abnormally rapid proliferation rate, cancer cells constantly encounter the limits of insufficient oxygen and nutrient supplies. To satisfy their growth needs and resist adverse environmental events, tumor cells modify the metabolic pathways to produce both extra energies and substances required for rapid growth. Realizing the metabolic characters special for tumor cells will be helpful for eliminating them during therapy. Cell death is a hot topic of long-term study and targeting cell death is one of the most effective ways to repress tumor growth. Many studies have successfully demonstrated that metabolism is inextricably linked to cell death of cancer cells. Here we summarize the recently identified metabolic characters that specifically impact on different types of cell deaths and discuss their roles in tumorigenesis.
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Affiliation(s)
- Shichao Yang
- School of Medicine, Chongqing University, Chongqing, 400030, P. R. China
| | - Caden Hu
- School of Medicine, Chongqing University, Chongqing, 400030, P. R. China
| | - Xiaomei Chen
- School of Medicine, Chongqing University, Chongqing, 400030, P. R. China
| | - Yi Tang
- Molecular Medicine Diagnostic and Testing Center, Chongqing Medical University, Chongqing, P. R. China
- Department of Pathology, College of Basic Medicine, Chongqing Medical University, Chongqing, P. R. China
| | - Juanjuan Li
- Department of breast and thyroid surgery, Renmin hospital of Wuhan University, Wuhan, 430060, P. R. China
| | - Hanqing Yang
- School of Medicine, Chongqing University, Chongqing, 400030, P. R. China
| | - Yi Yang
- Institute of Pathology and Southwest Cancer Center, The First Affiliated Hospital, Key Laboratory of Tumor Immunopathology, Third Military Medical University (Army Medical University, Ministry of Education of China, Chongqing, 400038, P. R. China
| | - Binwu Ying
- Department of Laboratory Medicine/Clinical Laboratory Medicine Research Center, West China Hospital, Sichuan University, Chengdu, Sichuan Province, 610041, P. R. China.
| | - Xue Xiao
- Department of Gynecology and Obstetrics, West China Second University Hospital, Sichuan University, Chengdu, P. R. China.
- Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, West China Second Hospital, Sichuan University, Chengdu, P. R. China.
| | - Shang-Ze Li
- School of Medicine, Chongqing University, Chongqing, 400030, P. R. China.
| | - Li Gu
- Department of Laboratory Medicine/Clinical Laboratory Medicine Research Center, West China Hospital, Sichuan University, Chengdu, Sichuan Province, 610041, P. R. China.
| | - Yahui Zhu
- School of Medicine, Chongqing University, Chongqing, 400030, P. R. China.
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Wan S, Li KP, Wang CY, Yang JW, Chen SY, Wang HB, Li XR, Yang L. Immunologic Crosstalk of Endoplasmic Reticulum Stress Signaling in Bladder Cancer. Curr Cancer Drug Targets 2024; 24:701-719. [PMID: 38265406 DOI: 10.2174/0115680096272663231121100515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 10/19/2023] [Accepted: 11/02/2023] [Indexed: 01/25/2024]
Abstract
Bladder cancer (BC) is a common malignant tumor of the urinary system. While current approaches involving adjuvant chemotherapy, radiotherapy, and immunotherapy have shown significant progress in BC treatment, challenges, such as recurrence and drug resistance, persist, especially in the case of muscle-invasive bladder cancer (MIBC). It is mainly due to the lack of pre-existing immune response cells in the tumor immune microenvironment. Micro-environmental changes (such as hypoxia and under-nutrition) can cause the aggregation of unfolded and misfolded proteins in the lumen, which induces endoplasmic reticulum (ER) stress. ER stress and its downstream signaling pathways are closely related to immunogenicity and tumor drug resistance. ER stress plays a pivotal role in a spectrum of processes within immune cells and the progression of BC cells, encompassing cell proliferation, autophagy, apoptosis, and resistance to therapies. Recent studies have increasingly recognized the potential of natural compounds to exhibit anti-BC properties through ER stress induction. Still, the efficacy of these natural compounds remains less than that of immune checkpoint inhibitors (ICIs). Currently, the ER stress-mediated immunogenic cell death (ICD) pathway is more encouraging, which can enhance ICI responses by mediating immune stemness. This article provides an overview of the recent developments in understanding how ER stress influences tumor immunity and its implications for BC. Targeting this pathway may soon emerge as a compelling therapeutic strategy for BC.
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Affiliation(s)
- Shun Wan
- Department of Urology, Lanzhou University Second Hospital, Lanzhou, 730000, PR China
- Gansu Province Clinical Research Center for Urology, Lanzhou, 730000, PR China
| | - Kun-Peng Li
- Department of Urology, Lanzhou University Second Hospital, Lanzhou, 730000, PR China
- Gansu Province Clinical Research Center for Urology, Lanzhou, 730000, PR China
| | - Chen-Yang Wang
- Department of Urology, Lanzhou University Second Hospital, Lanzhou, 730000, PR China
- Gansu Province Clinical Research Center for Urology, Lanzhou730000, PR China
| | - Jian-Wei Yang
- Department of Urology, Lanzhou University Second Hospital, Lanzhou, 730000, PR China
| | - Si-Yu Chen
- Department of Urology, Lanzhou University Second Hospital, Lanzhou, 730000, PR China
- Gansu Province Clinical Research Center for Urology, Lanzhou, 730000, PR China
| | - Hua-Bin Wang
- Department of Urology, Lanzhou University Second Hospital, Lanzhou, 730000, PR China
- Gansu Province Clinical Research Center for Urology, Lanzhou, 730000, PR China
| | - Xiao-Ran Li
- Department of Urology, Lanzhou University Second Hospital, Lanzhou, 730000, PR China
- Gansu Province Clinical Research Center for Urology, Lanzhou, 730000, PR China
| | - Li Yang
- Department of Urology, Lanzhou University Second Hospital, Lanzhou, 730000, PR China
- Gansu Province Clinical Research Center for Urology, Lanzhou, 730000, PR China
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Huntingtin-associated protein 1 is a potential tumor suppressor for gastric cancer. Mol Biol Rep 2023; 50:1517-1531. [PMID: 36509909 DOI: 10.1007/s11033-022-08090-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Accepted: 11/04/2022] [Indexed: 12/14/2022]
Abstract
BACKGROUND Gastric cancer is heterogeneous cancer and the causes of this disease are complex. New diagnostic and therapeutic targets are urgently needed to explore. Huntingtin-associated protein 1 (HAP1) is directly related to Huntington's disease (HD). However, patients with Huntington's disease have a lower incidence of cancer. Therefore, we are committed to studying the correlation between HAP1 and gastric carcinogenesis and development. METHODS AND RESULTS Immunohistochemical staining, western blot analysis, and RT-qPCR were conducted to explore the localization and expression of HAP1 in gastric cancer. To study the biological significance of HAP1, we overexpressed HAP1 in both MKN28 and AGS cell lines by lentivirus infection. To explore the role of HAP1 in cell proliferation, the cells counting assay, EdU incorporation assay, and colony formation assay were carried out. We performed the wound healing assay and transwell assay to study the cell migration and invasion. To further investigate whether HAP1 could regulate gastric cancer cell death during glucose deprivation, Annexin V-FITC/PI staining was performed. In our study, we elucidated that HAP1 was downregulated in gastric cancer. What's more, overexpressing HAP1 inhibited cell proliferation, cell migration and invasion, and triggered apoptosis during glucose deprivation. More importantly, the antitumor properties and mechanisms of HAP1 have been elucidated further in gastric cancer. CONCLUSIONS Taken together, the available evidence implies that HAP1 may serve as a potential tumor suppressor, making it a significant target in preventing and treating gastric cancer. This research provides a theoretical basis for the early diagnosis, clinical targeted therapy, and prognosis evaluation of gastric cancer.
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Canonical and Noncanonical ER Stress-Mediated Autophagy Is a Bite the Bullet in View of Cancer Therapy. Cells 2022; 11:cells11233773. [PMID: 36497032 PMCID: PMC9738281 DOI: 10.3390/cells11233773] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 11/20/2022] [Accepted: 11/22/2022] [Indexed: 11/29/2022] Open
Abstract
Cancer cells adapt multiple mechanisms to counter intense stress on their way to growth. Tumor microenvironment stress leads to canonical and noncanonical endoplasmic stress (ER) responses, which mediate autophagy and are engaged during proteotoxic challenges to clear unfolded or misfolded proteins and damaged organelles to mitigate stress. In these conditions, autophagy functions as a cytoprotective mechanism in which malignant tumor cells reuse degraded materials to generate energy under adverse growing conditions. However, cellular protection by autophagy is thought to be complicated, contentious, and context-dependent; the stress response to autophagy is suggested to support tumorigenesis and drug resistance, which must be adequately addressed. This review describes significant findings that suggest accelerated autophagy in cancer, a novel obstacle for anticancer therapy, and discusses the UPR components that have been suggested to be untreatable. Thus, addressing the UPR or noncanonical ER stress components is the most effective approach to suppressing cytoprotective autophagy for better and more effective cancer treatment.
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6
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Rufo N, Yang Y, De Vleeschouwer S, Agostinis P. The "Yin and Yang" of Unfolded Protein Response in Cancer and Immunogenic Cell Death. Cells 2022; 11:2899. [PMID: 36139473 PMCID: PMC9497201 DOI: 10.3390/cells11182899] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 09/08/2022] [Accepted: 09/09/2022] [Indexed: 11/23/2022] Open
Abstract
Physiological and pathological burdens that perturb endoplasmic reticulum homeostasis activate the unfolded protein response (UPR), a conserved cytosol-to-nucleus signaling pathway that aims to reinstate the vital biosynthetic and secretory capacity of the ER. Disrupted ER homeostasis, causing maladaptive UPR signaling, is an emerging trait of cancer cells. Maladaptive UPR sustains oncogene-driven reprogramming of proteostasis and metabolism and fosters proinflammatory pathways promoting tissue repair and protumorigenic immune responses. However, when cancer cells are exposed to conditions causing irreparable ER homeostasis, such as those elicited by anticancer therapies, the UPR switches from a survival to a cell death program. This lethal ER stress response can elicit immunogenic cell death (ICD), a form of cell death with proinflammatory traits favoring antitumor immune responses. How UPR-driven pathways transit from a protective to a killing modality with favorable immunogenic and proinflammatory output remains unresolved. Here, we discuss key aspects of the functional dichotomy of UPR in cancer cells and how this signal can be harnessed for therapeutic benefit in the context of ICD, especially from the aspect of inflammation aroused by the UPR.
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Affiliation(s)
- Nicole Rufo
- Laboratory of Cell Death Research & Therapy, Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium
- VIB Center for Cancer Biology Research, 3000 Leuven, Belgium
| | - Yihan Yang
- Laboratory of Cell Death Research & Therapy, Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium
- VIB Center for Cancer Biology Research, 3000 Leuven, Belgium
- Research Group Experimental Neurosurgery and Neuroanatomy, Department of Neurosciences, KU Leuven, 3000 Leuven, Belgium
| | - Steven De Vleeschouwer
- Research Group Experimental Neurosurgery and Neuroanatomy, Department of Neurosciences, KU Leuven, 3000 Leuven, Belgium
- Department of Neurosurgery, University Hospitals Leuven, 3000 Leuven, Belgium
- Leuven Brain Institute (LBI), KU Leuven, 3000 Leuven, Belgium
| | - Patrizia Agostinis
- Laboratory of Cell Death Research & Therapy, Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium
- VIB Center for Cancer Biology Research, 3000 Leuven, Belgium
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7
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Nakayama Y, Mukai N, Kreitzer G, Patwari P, Yoshioka J. Interaction of ARRDC4 With GLUT1 Mediates Metabolic Stress in the Ischemic Heart. Circ Res 2022; 131:510-527. [PMID: 35950500 PMCID: PMC9444972 DOI: 10.1161/circresaha.122.321351] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 08/01/2022] [Indexed: 01/26/2023]
Abstract
BACKGROUND An ancient family of arrestin-fold proteins, termed alpha-arrestins, may have conserved roles in regulating nutrient transporter trafficking and cellular metabolism as adaptor proteins. One alpha-arrestin, TXNIP (thioredoxin-interacting protein), is known to regulate myocardial glucose uptake. However, the in vivo role of the related alpha-arrestin, ARRDC4 (arrestin domain-containing protein 4), is unknown. METHODS We first tested whether interaction with GLUTs (glucose transporters) is a conserved function of the mammalian alpha-arrestins. To define the in vivo function of ARRDC4, we generated and characterized a novel Arrdc4 knockout (KO) mouse model. We then analyzed the molecular interaction between arrestin domains and the basal GLUT1. RESULTS ARRDC4 binds to GLUT1, induces its endocytosis, and blocks cellular glucose uptake in cardiomyocytes. Despite the closely shared protein structure, ARRDC4 and its homologue TXNIP operate by distinct molecular pathways. Unlike TXNIP, ARRDC4 does not increase oxidative stress. Instead, ARRDC4 uniquely mediates cardiomyocyte death through its effects on glucose deprivation and endoplasmic reticulum stress. At baseline, Arrdc4-KO mice have mild fasting hypoglycemia. Arrdc4-KO hearts exhibit a robust increase in myocardial glucose uptake and glycogen storage. Accordingly, deletion of Arrdc4 improves energy homeostasis during ischemia and protects cardiomyocytes against myocardial infarction. Furthermore, structure-function analyses of the interaction of ARRDC4 with GLUT1 using both scanning mutagenesis and deep-learning Artificial Intelligence identify specific residues in the C-terminal arrestin-fold domain as the interaction interface that regulates GLUT1 function, revealing a new molecular target for potential therapeutic intervention against myocardial ischemia. CONCLUSIONS These results uncover a new mechanism of ischemic injury in which ARRDC4 drives glucose deprivation-induced endoplasmic reticulum stress leading to cardiomyocyte death. Our findings establish ARRDC4 as a new scaffold protein for GLUT1 that regulates cardiac metabolism in response to ischemia and provide insight into the therapeutic strategy for ischemic heart disease.
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Affiliation(s)
- Yoshinobu Nakayama
- Department of Molecular, Cellular & Biomedical Sciences, City University of New York School of Medicine, City College of New York, New York, New York
| | - Nobuhiro Mukai
- Department of Molecular, Cellular & Biomedical Sciences, City University of New York School of Medicine, City College of New York, New York, New York
| | - Geri Kreitzer
- Department of Molecular, Cellular & Biomedical Sciences, City University of New York School of Medicine, City College of New York, New York, New York
| | - Parth Patwari
- Cardiovascular Division, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
| | - Jun Yoshioka
- Department of Molecular, Cellular & Biomedical Sciences, City University of New York School of Medicine, City College of New York, New York, New York
- Cardiovascular Division, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
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Jinesh GG, Brohl AS. Classical epithelial-mesenchymal transition (EMT) and alternative cell death process-driven blebbishield metastatic-witch (BMW) pathways to cancer metastasis. Signal Transduct Target Ther 2022; 7:296. [PMID: 35999218 PMCID: PMC9399134 DOI: 10.1038/s41392-022-01132-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Revised: 07/14/2022] [Accepted: 07/24/2022] [Indexed: 12/13/2022] Open
Abstract
Metastasis is a pivotal event that accelerates the prognosis of cancer patients towards mortality. Therapies that aim to induce cell death in metastatic cells require a more detailed understanding of the metastasis for better mitigation. Towards this goal, we discuss the details of two distinct but overlapping pathways of metastasis: a classical reversible epithelial-to-mesenchymal transition (hybrid-EMT)-driven transport pathway and an alternative cell death process-driven blebbishield metastatic-witch (BMW) transport pathway involving reversible cell death process. The knowledge about the EMT and BMW pathways is important for the therapy of metastatic cancers as these pathways confer drug resistance coupled to immune evasion/suppression. We initially discuss the EMT pathway and compare it with the BMW pathway in the contexts of coordinated oncogenic, metabolic, immunologic, and cell biological events that drive metastasis. In particular, we discuss how the cell death environment involving apoptosis, ferroptosis, necroptosis, and NETosis in BMW or EMT pathways recruits immune cells, fuses with it, migrates, permeabilizes vasculature, and settles at distant sites to establish metastasis. Finally, we discuss the therapeutic targets that are common to both EMT and BMW pathways.
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Affiliation(s)
- Goodwin G Jinesh
- Department of Molecular Oncology, 12902 USF Magnolia Drive, H. Lee Moffitt Cancer Center & Research Institute, Tampa, 33612, FL, USA. .,Sarcoma Department, 12902 USF Magnolia Drive, H. Lee Moffitt Cancer Center & Research Institute, Tampa, 33612, FL, USA.
| | - Andrew S Brohl
- Department of Molecular Oncology, 12902 USF Magnolia Drive, H. Lee Moffitt Cancer Center & Research Institute, Tampa, 33612, FL, USA. .,Sarcoma Department, 12902 USF Magnolia Drive, H. Lee Moffitt Cancer Center & Research Institute, Tampa, 33612, FL, USA.
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The combination of hydroxychloroquine and 2-deoxyglucose enhances apoptosis in breast cancer cells by blocking protective autophagy and sustaining endoplasmic reticulum stress. Cell Death Dis 2022; 8:286. [PMID: 35690609 PMCID: PMC9188615 DOI: 10.1038/s41420-022-01074-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Revised: 05/12/2022] [Accepted: 05/27/2022] [Indexed: 02/06/2023]
Abstract
2-Deoxyglucose (2-DG) can be used in antitumour research by inhibiting glycolysis and promoting the endoplasmic reticulum stress (ERS) pathway, but its clinical application is restricted due to dose-limiting side effects and survival chance for cancer cells by protective autophagy. Therefore, our research explored whether the combination of hydroxychloroquine (HCQ), an FDA-approved autophagy inhibiting drug, and 2-DG is a promising therapeutic strategy. Here, we report that HCQ combined with 2-DG can further inhibit the viability and migration and induce apoptosis of breast tumour cells compared with other individual drugs. The combination of 2-DG and HCQ can significantly reduce transplanted tumour size and tumour cell metastasis of the lung and liver in vivo. At the cellular level, HCQ suppressed autolysosome formation and terminated the autophagy process induced by 2-DG-mediated ERS, resulting in the continuous accumulation of misfolded proteins in the endoplasmic reticulum, which generated sustained ERS through the PERK-eIF2α-ATF-4-CHOP axis and triggered the transformation from a survival process to cell death. Our research reinforced the research interest of metabolic disruptors in triple-negative breast cancer and emphasized the potential of the combination of 2-DG and HCQ as an anticancerous treatment.
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Licari E, Sánchez-Del-Campo L, Falletta P. The two faces of the Integrated Stress Response in cancer progression and therapeutic strategies. Int J Biochem Cell Biol 2021; 139:106059. [PMID: 34400318 DOI: 10.1016/j.biocel.2021.106059] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 08/08/2021] [Accepted: 08/10/2021] [Indexed: 01/05/2023]
Abstract
In recent years considerable progress has been made in identifying the impact of mRNA translation in tumour progression. Cancer cells hijack the pre-existing translation machinery to thrive under the adverse conditions originating from intrinsic oncogenic programs, that increase their energetic demand, and from the hostile microenvironment. A key translation program frequently dysregulated in cancer is the Integrated Stress Response, that reprograms translation by attenuating global protein synthesis to decrease metabolic demand while increasing translation of specific mRNAs that support survival, migration, immune escape. In this review we provide an overview of the Integrated Stress Response, emphasise its dual role during tumorigenesis and cancer progression, and highlight the therapeutic strategies available to target it.
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Affiliation(s)
| | - Luis Sánchez-Del-Campo
- Department of Biochemistry and Molecular Biology A, School of Biology, IMIB-University of Murcia, 30100, Spain
| | - Paola Falletta
- Experimental Imaging Center, IRCCS Ospedale San Raffaele, Milan, Italy.
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11
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Aghaei M, Nasimian A, Rahmati M, Kawalec P, Machaj F, Rosik J, Bhushan B, Bathaie SZ, Azarpira N, Los MJ, Samali A, Perrin D, Gordon JW, Ghavami S. The Role of BiP and the IRE1α-XBP1 Axis in Rhabdomyosarcoma Pathology. Cancers (Basel) 2021; 13:cancers13194927. [PMID: 34638414 PMCID: PMC8508025 DOI: 10.3390/cancers13194927] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 09/24/2021] [Accepted: 09/24/2021] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND Rhabdomyosarcoma (RMS) is the most common soft-tissue sarcoma in children, and is associated with a poor prognosis in patients presenting with recurrent or metastatic disease. The unfolded protein response (UPR) plays pivotal roles in tumor development and resistance to therapy, including RMS. METHODS In this study, we used immunohistochemistry and a tissue microarray (TMA) on human RMS and normal skeletal muscle to evaluate the expression of key UPR proteins (GRP78/BiP, IRE1α and cytosolic/nuclear XBP1 (spliced XBP1-sXBP1)) in the four main RMS subtypes: alveolar (ARMS), embryonal (ERMS), pleomorphic (PRMS) and sclerosing/spindle cell (SRMS) RMS. We also investigated the correlation of these proteins with the risk of RMS and several clinicopathological indices, such as lymph node involvement, distant metastasis, tumor stage and tumor scores. RESULTS Our results revealed that the expression of BiP, sXBP1, and IRE1α, but not cytosolic XBP1, are significantly associated with RMS (BiP and sXBP1 p-value = 0.0001, IRE1 p-value = 0.001) in all of the studied types of RMS tumors (n = 192) compared to normal skeletal muscle tissues (n = 16). In addition, significant correlations of BiP with the lymph node score (p = 0.05), and of IRE1α (p value = 0.004), cytosolic XBP1 (p = 0.001) and sXBP1 (p value = 0.001) with the stage score were observed. At the subtype level, BiP and sXBP1 expression were significantly associated with all subtypes of RMS, whereas IRE1α was associated with ARMS, PRMS and ERMS, and cytosolic XBP1 expression was associated with ARMS and SRMS. Importantly, the expression levels of IRE1α and sXBP1 were more pronounced in ARMS than in any of the other subtypes. The results also showed correlations of BiP with the lymph node score in ARMS (p value = 0.05), and of sXBP1 with the tumor score in PRMS (p value = 0.002). CONCLUSIONS In summary, this study demonstrates that the overall UPR is upregulated and, more specifically, that the IRE1/sXBP1 axis is active in RMS. The subtype and stage-specific dependency on the UPR machinery in RMS may open new avenues for the development of novel targeted therapeutic strategies and the identification of specific tumor markers in this rare but deadly childhood and young-adult disease.
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Affiliation(s)
- Mahmoud Aghaei
- Department of Clinical Biochemistry, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan 81746-73461, Iran;
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (A.N.); (P.K.); (F.M.); (J.R.); (B.B.)
| | - Ahmad Nasimian
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (A.N.); (P.K.); (F.M.); (J.R.); (B.B.)
- Department of Clinical Biochemistry, Faculty of Medical Sciences, Tarbiat Modares University, Tehran 14155-331, Iran;
| | - Marveh Rahmati
- Cancer Biology Research Center, Tehran University of Medical Sciences, Tehran 14197-33141, Iran;
| | - Philip Kawalec
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (A.N.); (P.K.); (F.M.); (J.R.); (B.B.)
| | - Filip Machaj
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (A.N.); (P.K.); (F.M.); (J.R.); (B.B.)
| | - Jakub Rosik
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (A.N.); (P.K.); (F.M.); (J.R.); (B.B.)
| | - Bhavya Bhushan
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (A.N.); (P.K.); (F.M.); (J.R.); (B.B.)
| | - S. Zahra Bathaie
- Department of Clinical Biochemistry, Faculty of Medical Sciences, Tarbiat Modares University, Tehran 14155-331, Iran;
- Institute for Natural Products and Medicinal Plants, Tarbiat Modares University, Tehran 14155-331, Iran
| | - Negar Azarpira
- Transplant Research Center, Shiraz University of Medical Sciences, Shiraz 7134814336, Iran;
| | - Marek J. Los
- Biotechnology Center, Silesian University of Technology, 71-344 Gliwice, Poland;
| | - Afshin Samali
- Apoptosis Research Centre, School of Natural Sciences, National University of Ireland, H91 W2TY Galway, Ireland;
| | - David Perrin
- Section of Orthopaedic Surgery, Department of Surgery, University of Manitoba, Winnipeg, MB R3E 0V9, Canada;
| | - Joseph W. Gordon
- College of Nursing, Rady Faculty of Health Science, University of Manitoba, Winnipeg, MB R3E 0V9, Canada;
| | - Saeid Ghavami
- Department of Human Anatomy and Cell Science, University of Manitoba College of Medicine, Winnipeg, MB R3E 0V9, Canada; (A.N.); (P.K.); (F.M.); (J.R.); (B.B.)
- Research Institutes of Oncology and Hematology, Cancer Care Manitoba-University of Manitoba, Winnipeg, MB R3E 0V9, Canada
- Biology of Breathing Theme, Children Hospital Research Institute of Manitoba, University of Manitoba, Winnipeg, MB R3E 0V9, Canada
- Autophagy Research Center, Shiraz University of Medical Sciences, Shiraz 7134845794, Iran
- Faculty of Medicine, Katowice School of Technology, 40-555 Katowice, Poland
- Correspondence: ; Tel.: +1-204-272-3061 or +1-204-272-3071
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12
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McCann C, Kerr EM. Metabolic Reprogramming: A Friend or Foe to Cancer Therapy? Cancers (Basel) 2021; 13:3351. [PMID: 34283054 PMCID: PMC8267696 DOI: 10.3390/cancers13133351] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 06/30/2021] [Accepted: 07/01/2021] [Indexed: 12/12/2022] Open
Abstract
Drug resistance is a major cause of cancer treatment failure, effectively driven by processes that promote escape from therapy-induced cell death. The mechanisms driving evasion of apoptosis have been widely studied across multiple cancer types, and have facilitated new and exciting therapeutic discoveries with the potential to improve cancer patient care. However, an increasing understanding of the crosstalk between cancer hallmarks has highlighted the complexity of the mechanisms of drug resistance, co-opting pathways outside of the canonical "cell death" machinery to facilitate cell survival in the face of cytotoxic stress. Rewiring of cellular metabolism is vital to drive and support increased proliferative demands in cancer cells, and recent discoveries in the field of cancer metabolism have uncovered a novel role for these programs in facilitating drug resistance. As a key organelle in both metabolic and apoptotic homeostasis, the mitochondria are at the forefront of these mechanisms of resistance, coordinating crosstalk in the event of cellular stress, and promoting cellular survival. Importantly, the appreciation of this role metabolism plays in the cytotoxic response to therapy, and the ability to profile metabolic adaptions in response to treatment, has encouraged new avenues of investigation into the potential of exploiting metabolic addictions to improve therapeutic efficacy and overcome drug resistance in cancer. Here, we review the role cancer metabolism can play in mediating drug resistance, and the exciting opportunities presented by imposed metabolic vulnerabilities.
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Affiliation(s)
| | - Emma M. Kerr
- Patrick G. Johnston Centre for Cancer Research, Queen’s University Belfast, 97 Lisburn Rd, BT9 7AE Belfast, Ireland;
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13
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McCarthy N, Dolgikh N, Logue S, Patterson JB, Zeng Q, Gorman AM, Samali A, Fulda S. The IRE1 and PERK arms of the unfolded protein response promote survival of rhabdomyosarcoma cells. Cancer Lett 2020; 490:76-88. [PMID: 32679165 DOI: 10.1016/j.canlet.2020.07.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 06/25/2020] [Accepted: 07/08/2020] [Indexed: 02/07/2023]
Abstract
Rhabdomyosarcoma (RMS), the most common soft-tissue sarcoma, is associated with a low 5-year survival and harsh treatment side effects, underscoring an urgent need for therapy. The unfolded protein response (UPR) is activated in response to endoplasmic reticulum (ER) stress, where three ER stress receptors, IRE1, PERK and ATF6, aim to restore cellular homeostasis. The UPR is pro-tumourigenic in many cancers. In this study, we investigate basal UPR activity in RMS. Basal activation of IRE1 and PERK was observed in RMS cell lines, which was diminished upon addition of the IRE1 RNase inhibitor, MKC8866, or PERK inhibitor, AMGEN44. UPR inhibition caused a reduction in cell viability, cell proliferation and inhibition of long-term colony formation in both subtypes of RMS. Alveolar RMS (ARMS) subtype was highly sensitive to IRE1 inhibition, whereas embryonal RMS (ERMS) subtypes responded more markedly to PERK inhibition. Further investigation revealed a robust activation of senescence upon UPR inhibition. For the first time, the UPR is implicated in RMS biology and phenotype, and inhibition of UPR signalling reduces cell growth, suggesting that the UPR may be a promising target in RMS.
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Affiliation(s)
- Nicole McCarthy
- Institute for Experimental Cancer Research in Pediatrics, Goethe-University Frankfurt, Komturstr. 3a, 60528, Frankfurt, Germany
| | - Nadezda Dolgikh
- Institute for Experimental Cancer Research in Pediatrics, Goethe-University Frankfurt, Komturstr. 3a, 60528, Frankfurt, Germany
| | - Susan Logue
- Rady Faculty of Health Sciences, University of Manitoba, Canada
| | | | - Qinping Zeng
- Fosun Orinove PharmaTech Inc., Suzhou, Jiangsu, China
| | - Adrienne M Gorman
- Apoptosis Research Centre, National University of Ireland Galway, Galway, Ireland; School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Afshin Samali
- Apoptosis Research Centre, National University of Ireland Galway, Galway, Ireland; School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Simone Fulda
- Institute for Experimental Cancer Research in Pediatrics, Goethe-University Frankfurt, Komturstr. 3a, 60528, Frankfurt, Germany; German Cancer Consortium (DKTK), Partner Site Frankfurt, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany.
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14
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Wang SF, Chen S, Tseng LM, Lee HC. Role of the mitochondrial stress response in human cancer progression. Exp Biol Med (Maywood) 2020; 245:861-878. [PMID: 32326760 PMCID: PMC7268930 DOI: 10.1177/1535370220920558] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
IMPACT STATEMENT Dysregulated mitochondria often occurred in cancers. Mitochondrial dysfunction might contribute to cancer progression. We reviewed several mitochondrial stresses in cancers. Mitochondrial stress responses might contribute to cancer progression. Several mitochondrion-derived molecules (ROS, Ca2+, oncometabolites, exported mtDNA, mitochondrial double-stranded RNA, humanin, and MOTS-c), integrated stress response, and mitochondrial unfolded protein response act as retrograde signaling pathways and might be critical in the development and progression of cancer. Targeting these mitochondrial stress responses may be an important strategy for cancer treatment.
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Affiliation(s)
- Sheng-Fan Wang
- Department of Pharmacy, Taipei Veterans General Hospital, 112 Taipei
- School of Pharmacy, Taipei Medical University, 110 Taipei
- Department and Institute of Pharmacology, School of Medicine, National Yang-Ming University, 112 Taipei
| | - Shiuan Chen
- Department of Cancer Biology, Beckman Research Institute of the City of Hope, CA 91010, USA
| | - Ling-Ming Tseng
- Division of General Surgery, Department of Surgery, Comprehensive Breast Health Center, Taipei Veterans General Hospital, 112 Taipei
- Department of Surgery, School of Medicine, National Yang-Ming University, 112 Taipei
| | - Hsin-Chen Lee
- Department and Institute of Pharmacology, School of Medicine, National Yang-Ming University, 112 Taipei
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15
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Starvation and antimetabolic therapy promote cytokine release and recruitment of immune cells. Proc Natl Acad Sci U S A 2020; 117:9932-9941. [PMID: 32312819 PMCID: PMC7211964 DOI: 10.1073/pnas.1913707117] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Cellular starvation is typically a consequence of tissue injury that disrupts the local blood supply but can also occur where cell populations outgrow the local vasculature, as observed in solid tumors. Cells react to nutrient deprivation by adapting their metabolism, or, if starvation is prolonged, it can result in cell death. Cell starvation also triggers adaptive responses, like angiogenesis, that promote tissue reorganization and repair, but other adaptive responses and their mediators are still poorly characterized. To explore this issue, we analyzed secretomes from glucose-deprived cells, which revealed up-regulation of multiple cytokines and chemokines, including IL-6 and IL-8, in response to starvation stress. Starvation-induced cytokines were cell type-dependent, and they were also released from primary epithelial cells. Most cytokines were up-regulated in a manner dependent on NF-κB and the transcription factor of the integrated stress response ATF4, which bound directly to the IL-8 promoter. Furthermore, glutamine deprivation, as well as the antimetabolic drugs 2-deoxyglucose and metformin, also promoted the release of IL-6 and IL-8. Finally, some of the factors released from starved cells induced chemotaxis of B cells, macrophages, and neutrophils, suggesting that nutrient deprivation in the tumor environment can serve as an initiator of tumor inflammation.
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Zhu YP, Zheng Z, Xiang Y, Zhang Y. Glucose Starvation-Induced Rapid Death of Nrf1 α-Deficient, but Not Nrf2-Deficient, Hepatoma Cells Results from Its Fatal Defects in the Redox Metabolism Reprogramming. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:4959821. [PMID: 32774674 PMCID: PMC7407023 DOI: 10.1155/2020/4959821] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 05/08/2020] [Accepted: 05/29/2020] [Indexed: 02/07/2023]
Abstract
Metabolic reprogramming exists in a variety of cancer cells, with the most relevance to glucose as a source of energy and carbon for survival and proliferation. Of note, Nrf1 was shown to be essential for regulating glycolysis pathway, but it is unknown whether it plays a role in cancer metabolic reprogramming, particularly in response to glucose starvation. Herein, we discover that Nrf1α-/- hepatoma cells are sensitive to rapid death induced by glucose deprivation, such cell death appears to be rescued by Nrf2 interference, but HepG2 (wild-type, WT) or Nrf2-/- cells are roughly unaffected by glucose starvation. Further evidence revealed that Nrf1α-/- cell death is resulted from severe oxidative stress arising from aberrant redox metabolism. Strikingly, altered gluconeogenesis pathway was aggravated by glucose starvation of Nrf1α-/- cells, as also accompanied by weakened pentose phosphate pathway, dysfunction of serine-to-glutathione synthesis, and accumulation of reactive oxygen species (ROS) and damages, such that the intracellular GSH and NADPH were exhausted. These demonstrate that glucose starvation leads to acute death of Nrf1α-/- , rather than Nrf2-/- , cells resulting from its fatal defects in the redox metabolism reprogramming. This is owing to distinct requirements of Nrf1 and Nrf2 for regulating the constructive and inducible expression of key genes involved in redox metabolic reprogramming by glucose deprivation. Altogether, this work substantiates the preventive and therapeutic strategies against Nrf1α-deficient cancer by limiting its glucose and energy demands.
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Affiliation(s)
- Yu-ping Zhu
- 1The Laboratory of Cell Biochemistry and Topogenetic Regulation, College of Bioengineering and Faculty of Medical Sciences, Chongqing University, No. 174 Shazheng Street, Shapingba District, Chongqing 400044, China
| | - Ze Zheng
- 1The Laboratory of Cell Biochemistry and Topogenetic Regulation, College of Bioengineering and Faculty of Medical Sciences, Chongqing University, No. 174 Shazheng Street, Shapingba District, Chongqing 400044, China
| | - Yuancai Xiang
- 2Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Southwest Medical University, Sichuan 646000, China
| | - Yiguo Zhang
- 1The Laboratory of Cell Biochemistry and Topogenetic Regulation, College of Bioengineering and Faculty of Medical Sciences, Chongqing University, No. 174 Shazheng Street, Shapingba District, Chongqing 400044, China
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Aldehyde dehydrogenase-2 acts as a potential genetic target for renal fibrosis. Life Sci 2019; 239:117015. [DOI: 10.1016/j.lfs.2019.117015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 09/20/2019] [Accepted: 10/23/2019] [Indexed: 11/22/2022]
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Sharma A, Boise LH, Shanmugam M. Cancer Metabolism and the Evasion of Apoptotic Cell Death. Cancers (Basel) 2019; 11:E1144. [PMID: 31405035 PMCID: PMC6721599 DOI: 10.3390/cancers11081144] [Citation(s) in RCA: 88] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 07/29/2019] [Accepted: 08/08/2019] [Indexed: 12/19/2022] Open
Abstract
Cellular growth and proliferation depend upon the acquisition and synthesis of specific metabolites. These metabolites fuel the bioenergy, biosynthesis, and redox potential required for duplication of cellular biomass. Multicellular organisms maintain tissue homeostasis by balancing signals promoting proliferation and removal of cells via apoptosis. While apoptosis is in itself an energy dependent process activated by intrinsic and extrinsic signals, whether specific nutrient acquisition (elevated or suppressed) and their metabolism regulates apoptosis is less well investigated. Normal cellular metabolism is regulated by lineage specific intrinsic features and microenvironment driven extrinsic features. In the context of cancer, genetic abnormalities, unconventional microenvironments and/or therapy engage constitutive pro-survival signaling to re-program and rewire metabolism to maintain survival, growth, and proliferation. It thus becomes particularly relevant to understand whether altered nutrient acquisition and metabolism in cancer can also contribute to the evasion of apoptosis and consequently therapy resistance. Our review attempts to dissect a causal relationship between two cancer hallmarks, i.e., deregulated cellular energetics and the evasion of programmed cell death with primary focus on the intrinsic pathway of apoptosis.
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Affiliation(s)
- Aditi Sharma
- Department of Hematology and Medical Oncology, Winship Cancer Institute, School of Medicine, Emory University, Atlanta, GA 30322, USA
| | - Lawrence H Boise
- Department of Hematology and Medical Oncology, Winship Cancer Institute, School of Medicine, Emory University, Atlanta, GA 30322, USA
| | - Mala Shanmugam
- Department of Hematology and Medical Oncology, Winship Cancer Institute, School of Medicine, Emory University, Atlanta, GA 30322, USA.
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Sun Y, Ai JZ, Jin X, Liu LR, Lin TH, Xu H, Wei Q, Yang L. IL-8 protects prostate cancer cells from GSK-3β-induced oxidative stress by activating the mTOR signaling pathway. Prostate 2019; 79:1180-1190. [PMID: 31104320 DOI: 10.1002/pros.23836] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2018] [Revised: 04/19/2019] [Accepted: 05/03/2019] [Indexed: 02/05/2023]
Abstract
INTRODUCTION Both oxidative stress and inflammation play important roles in prostate cancer cell apoptosis or proliferation; however, the mechanisms underlying these processes remain unclear. Thus, we selected interleukin-8 (IL-8) as the bridge between inflammation and cancer cell oxidative stress-induced death and aimed to confirm its connection with mTOR and Glycogen synthase kinase-3 beta (GSK-3β). METHODS We overexpressed GSK-3β and observed its effect on reactive oxygen species (ROS) and oxidative stress-induced cell death. IL-8 was then upregulated or downregulated to determine its impact on preventing cell damage due to GSK-3β-induced oxidative stress. In addition, we overexpressed or knocked down mTOR to confirm its role in this process. Real-time PCR, Western blotting, transcription, Cell Counting Kit 8 (CCK-8), and flow cytometry analyses were performed in addition to the use of other techniques. RESULTS IL-8 promotes prostate cancer cell proliferation and decreases apoptosis, whereas GSK-3β activates the caspase-3 signaling pathway by increasing ROS and thereby induces oxidative stress-mediated cell death. In addition, mTOR can also decrease activation of the caspase-3 signaling pathway by inhibiting GSK-3 and thus decreasing ROS production. Moreover, the inhibitory effect of IL-8 on GSK-3β occurs through the regulation of mTOR. CONCLUSION The results of this study highlight the importance of GSK-3β, which increases the production of ROS and thereby induces oxidative stress in tumor cells, whereas IL-8 and mTOR attenuate oxidative stress to protect prostate cancer cells through inhibition of GSK-3β.
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Affiliation(s)
- Yi Sun
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, Guoxue Xiang, Chengdu, Sichuan, China
| | - Jian-Zhong Ai
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, Guoxue Xiang, Chengdu, Sichuan, China
| | - Xi Jin
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, Guoxue Xiang, Chengdu, Sichuan, China
| | - Liang-Ren Liu
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, Guoxue Xiang, Chengdu, Sichuan, China
| | - Tian-Hai Lin
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, Guoxue Xiang, Chengdu, Sichuan, China
| | - Hang Xu
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, Guoxue Xiang, Chengdu, Sichuan, China
| | - Qiang Wei
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, Guoxue Xiang, Chengdu, Sichuan, China
| | - Lu Yang
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, Guoxue Xiang, Chengdu, Sichuan, China
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Ou L, Sun T, Cheng Y, Huang L, Zhan X, Zhang P, Yang J, Zhang Y, Zhou Z. MicroRNA-214 contributes to regulation of necroptosis via targeting ATF4 in diabetes-associated periodontitis. J Cell Biochem 2019; 120:14791-14803. [PMID: 31090954 DOI: 10.1002/jcb.28740] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Revised: 02/01/2019] [Accepted: 02/14/2019] [Indexed: 12/26/2022]
Abstract
Diabetes and periodontal diseases have a mutual promoting relationship that induces severe tissue damage and cell death. The potential roles of microRNAs (miRNAs) and the type of cell death involved in diabetes-associated periodontitis are obscure. The gingival tissues of patients were obtained and MC3T3-E1 cells were costimulated with high glucose and lipopolysaccharide (LPS). Osseous morphometric analysis was evaluated with micro-CT, and histological characteristics were measured by hematoxylin/eosin and immunohistochemical staining. Cytokine secretion was confirmed by enzyme-linked immunosorbent assay, and reactive oxygen species (ROS) was measured using a DCFH-DA probe kit. Gene expression was measured by real-time quantitative reverse transcription PCR (qRT-PCR), and protein expression was assessed by Western blot and immunofluorescence analysis. The miR-214 level, receptor-interacting serine-threonine protein (RIP) 1, RIP3, and phospho-mixed lineage kinase domain-like (p-MLKL) protein expression were elevated in the inflamed gingival tissues of diabetes-associated periodontitis patients, with activating transcription factor 4 (ATF4) expression showing the opposite effect. The high glucose (22 mM) could not induce significant increase of RIP1, RIP3, and p-MLKL; however, the high glucose and LPS (500-1000 ng/mL) cotreatment resulted in increase in the number of RIP1, RIP3, and p-MLKL in MC3T3-E1 cells. NAC (ROS inhibitor) inhibited RIP1, RIP3, and increased ATF4; however, necrostatin-1 (Nec-1) (RIP1 inhibitor) specifically inhibited the protein expression of RIP1 and RIP3 and had no influence on ATF4. The use of antagomir-214 suppressed the expression of miR-214, RIP1, RIP3, and p-MLKL, but increased ATF4 protein level in glucose and LPS-induced cells. ATF4 knockdown by ATF4 small interfering RNA offset the effect of antagomir-214. RIP1- and RIP3-dependent necroptosis was confirmed in the inflamed gingival tissues of diabetes-associated periodontitis patients and high glucose- and LPS- cotreated cells. It was suggested that miR-214-targeted ATF4 participated in the regulation of necroptosis in vivo and in vitro.
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Affiliation(s)
- Lingling Ou
- Department of Stomatology, The First Affiliated Hospital of Jinan University, Guangzhou, P.R. China
| | - Ting Sun
- Department of Stomatology, The First Affiliated Hospital of Jinan University, Guangzhou, P.R. China
| | - Yaodong Cheng
- Department of Stomatology, The First Affiliated Hospital of Jinan University, Guangzhou, P.R. China
| | - Linwei Huang
- Department of Stomatology, The First Affiliated Hospital of Jinan University, Guangzhou, P.R. China
| | - Xiaozhen Zhan
- Department of Stomatology, The First Affiliated Hospital of Jinan University, Guangzhou, P.R. China
| | - Peng Zhang
- Department of Pathology, Medical School of Yichun University, Yichun, Jiangxi, P.R. China
| | - Junjie Yang
- Department of Stomatology, The First Affiliated Hospital of Jinan University, Guangzhou, P.R. China
| | - Ye Zhang
- Department of Stomatology, The First Affiliated Hospital of Jinan University, Guangzhou, P.R. China
| | - Zhiying Zhou
- Department of Stomatology, The First Affiliated Hospital of Jinan University, Guangzhou, P.R. China
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Abstract
Nutrient starvation or inhibition of cellular metabolism can induce cancer cell death. This can be measured by a variety of methods. We describe here four simple methods to measure cell death in culture by using microscopy, western blot, and flow cytometry. We also provide tools to differentiate between different forms of cell death like apoptosis and necrosis by using chemical inhibitors.
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Protein N-glycosylation alteration and glycolysis inhibition both contribute to the antiproliferative action of 2-deoxyglucose in breast cancer cells. Breast Cancer Res Treat 2018; 171:581-591. [DOI: 10.1007/s10549-018-4874-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Accepted: 07/01/2018] [Indexed: 12/12/2022]
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23
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Gonzalez-Menendez P, Hevia D, Alonso-Arias R, Alvarez-Artime A, Rodriguez-Garcia A, Kinet S, Gonzalez-Pola I, Taylor N, Mayo JC, Sainz RM. GLUT1 protects prostate cancer cells from glucose deprivation-induced oxidative stress. Redox Biol 2018; 17:112-127. [PMID: 29684818 PMCID: PMC6007175 DOI: 10.1016/j.redox.2018.03.017] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 03/20/2018] [Accepted: 03/26/2018] [Indexed: 01/02/2023] Open
Abstract
Glucose, chief metabolic support for cancer cell survival and growth, is mainly imported into cells by facilitated glucose transporters (GLUTs). The increase in glucose uptake along with tumor progression is due to an increment of facilitative glucose transporters as GLUT1. GLUT1 prevents cell death of cancer cells caused by growth factors deprivation, but there is scarce information about its role on the damage caused by glucose deprivation, which usually occurs within the core of a growing tumor. In prostate cancer (PCa), GLUT1 is found in the most aggressive tumors, and it is regulated by androgens. To study the response of androgen-sensitive and insensitive PCa cells to glucose deprivation and the role of GLUT1 on survival mechanisms, androgen-sensitive LNCaP and castration-resistant LNCaP-R cells were employed. Results demonstrated that glucose deprivation induced a necrotic type of cell death which is prevented by antioxidants. Androgen-sensitive cells show a higher resistance to cell death triggered by glucose deprivation than castration-resistant cells. Glucose removal causes an increment of H2O2, an activation of androgen receptor (AR) and a stimulation of AMP-activated protein kinase activity. In addition, glucose removal increases GLUT1 production in androgen sensitive PCa cells. GLUT1 ectopic overexpression makes PCa cells more resistant to glucose deprivation and oxidative stress-induced cell death. Under glucose deprivation, GLUT1 overexpressing PCa cells sustains mitochondrial SOD2 activity, compromised after glucose removal, and significantly increases reduced glutathione (GSH). In conclusion, androgen-sensitive PCa cells are more resistant to glucose deprivation-induced cell death by a GLUT1 upregulation through an enhancement of reduced glutathione levels. Glucose deprivation carries an increase of free radicals in prostate cancer cells. The androgen receptor activation after glucose deprivation proceeds with GLUT1 overproduction. Treatment with hydrogen peroxide mimics the response to glucose deprivation. GLUT1-overexpressing prostate cancer cells are more resistant to glucose deprivation. Glutathione is more reduced in GLUT1-overexpressing cells under glucose deprivation.
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Affiliation(s)
- Pedro Gonzalez-Menendez
- Department of Morphology and Cell Biology, Redox Biology Unit. University Institute of Oncology of Asturias (IUOPA), University of Oviedo. Facultad de Medicina, Julián Clavería 6, 33006 Oviedo, Spain
| | - David Hevia
- Department of Morphology and Cell Biology, Redox Biology Unit. University Institute of Oncology of Asturias (IUOPA), University of Oviedo. Facultad de Medicina, Julián Clavería 6, 33006 Oviedo, Spain
| | - Rebeca Alonso-Arias
- Department of Immunology, Hospital Universitario Central de Asturias (HUCA), Avenida de Roma, 33011 Oviedo, Spain
| | - Alejandro Alvarez-Artime
- Department of Morphology and Cell Biology, Redox Biology Unit. University Institute of Oncology of Asturias (IUOPA), University of Oviedo. Facultad de Medicina, Julián Clavería 6, 33006 Oviedo, Spain
| | - Aida Rodriguez-Garcia
- Department of Microbiology, Tumor, and Cell Biology (MTC), Karolinska Institute, Tomtebodavägen 12C, Iastkajen, 171 65 Stockholm, Sweden
| | - Sandrina Kinet
- Institut de Genetique Moleculaire de Montpellier, Centre National de la Recherche Scientifique UMR5535, Universite de Montpellier 1 et 2, F-34293 Montpellier, France; Laboratory of Excellence GR-Ex, Paris 75015, France
| | - Ivan Gonzalez-Pola
- Department of Morphology and Cell Biology, Redox Biology Unit. University Institute of Oncology of Asturias (IUOPA), University of Oviedo. Facultad de Medicina, Julián Clavería 6, 33006 Oviedo, Spain
| | - Naomi Taylor
- Institut de Genetique Moleculaire de Montpellier, Centre National de la Recherche Scientifique UMR5535, Universite de Montpellier 1 et 2, F-34293 Montpellier, France; Laboratory of Excellence GR-Ex, Paris 75015, France
| | - Juan C Mayo
- Department of Morphology and Cell Biology, Redox Biology Unit. University Institute of Oncology of Asturias (IUOPA), University of Oviedo. Facultad de Medicina, Julián Clavería 6, 33006 Oviedo, Spain.
| | - Rosa M Sainz
- Department of Morphology and Cell Biology, Redox Biology Unit. University Institute of Oncology of Asturias (IUOPA), University of Oviedo. Facultad de Medicina, Julián Clavería 6, 33006 Oviedo, Spain.
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Regulation of Tumor Progression by Programmed Necrosis. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:3537471. [PMID: 29636841 PMCID: PMC5831895 DOI: 10.1155/2018/3537471] [Citation(s) in RCA: 125] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 11/28/2017] [Indexed: 12/12/2022]
Abstract
Rapidly growing malignant tumors frequently encounter hypoxia and nutrient (e.g., glucose) deprivation, which occurs because of insufficient blood supply. This results in necrotic cell death in the core region of solid tumors. Necrotic cells release their cellular cytoplasmic contents into the extracellular space, such as high mobility group box 1 (HMGB1), which is a nonhistone nuclear protein, but acts as a proinflammatory and tumor-promoting cytokine when released by necrotic cells. These released molecules recruit immune and inflammatory cells, which exert tumor-promoting activity by inducing angiogenesis, proliferation, and invasion. Development of a necrotic core in cancer patients is also associated with poor prognosis. Conventionally, necrosis has been thought of as an unregulated process, unlike programmed cell death processes like apoptosis and autophagy. Recently, necrosis has been recognized as a programmed cell death, encompassing processes such as oncosis, necroptosis, and others. Metabolic stress-induced necrosis and its regulatory mechanisms have been poorly investigated until recently. Snail and Dlx-2, EMT-inducing transcription factors, are responsible for metabolic stress-induced necrosis in tumors. Snail and Dlx-2 contribute to tumor progression by promoting necrosis and inducing EMT and oncogenic metabolism. Oncogenic metabolism has been shown to play a role(s) in initiating necrosis. Here, we discuss the molecular mechanisms underlying metabolic stress-induced programmed necrosis that promote tumor progression and aggressiveness.
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Schlafen2 mutation unravels a role for chronic ER stress in the loss of T cell quiescence. Oncotarget 2018; 7:39396-39407. [PMID: 27276683 PMCID: PMC5129940 DOI: 10.18632/oncotarget.9818] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2016] [Accepted: 05/22/2016] [Indexed: 11/29/2022] Open
Abstract
Immunologically naïve lymphocytes are kept in a quiescent state until antigen engagement. These quiescent immune cells are characterized by small cell size, lack of spontaneous proliferation and low metabolic rate. Lymphocyte quiescence is actively enforced condition which ensures the preservation of proper differentiation and proliferation capabilities of naïve and memory lymphocytes. Previously we described a chemically induced mutation in Schlafen2 (Slfn2), termed elektra, which breaks quiescence and compromises immunity. However, the mechanism by which Slfn2 maintains quiescence remains unknown. Here we demonstrate that elektra T cells display chronic ER stress under steady state conditions. Modulation of ER stress response by depletion of either UPR mediators XBP1 or CHOP, improved viability and partially corrected the developmental abnormalities and proliferation capabilities of elektra T cells. Altogether, our results demonstrate a functional connection between Slfn2 induced quiescence in T cells and ER homeostasis, clarifying a novel mechanism by which immune cell quiescence is maintained.
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Lee HY, Itahana Y, Schuechner S, Fukuda M, Je HS, Ogris E, Virshup DM, Itahana K. Ca2+-dependent demethylation of phosphatase PP2Ac promotes glucose deprivation–induced cell death independently of inhibiting glycolysis. Sci Signal 2018; 11:11/512/eaam7893. [DOI: 10.1126/scisignal.aam7893] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Bizjak M, Malavašič P, Dolinar K, Pohar J, Pirkmajer S, Pavlin M. Combined treatment with Metformin and 2-deoxy glucose induces detachment of viable MDA-MB-231 breast cancer cells in vitro. Sci Rep 2017; 7:1761. [PMID: 28496098 PMCID: PMC5431940 DOI: 10.1038/s41598-017-01801-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Accepted: 04/04/2017] [Indexed: 12/13/2022] Open
Abstract
Triple naegative breast cancer has an increased rate of distant metastasis and consequently poor prognosis. To metastasize, breast cancer cells must detach from the main tumour mass and resist anoikis, a programmed cell death induced by lack of cell-extracellular matrix communication. Although cancer cells must detach to metastasize in vivo, the viability of floating cancer cells in vitro is rarely investigated. Here we show that co-treatment of anoikis-resistant MDA-MB-231 cells with metformin and 2-deoxy-D-glucose (2-DG) increased the percentage of floating cells, of which about 95% were viable. Floating cells resumed their proliferation once they were reseeded in the pharmacological compound-free medium. Similar effects on detachment were observed on anoikis-prone MCF-7 cells. Co-treatment of MDA-MB-231 cells with metformin and 2-DG induced a strong activation of AMP-activated protein kinase (AMPK), which was reduced by AMPK inhibitor compound C that prevented detachment of MDA-MB-231 cells. However, direct AMPK activators A-769662 and AICAR did not have any major effect on the percentage of floating MDA-MB-231 cells, indicating that AMPK activation is necessary but not sufficient for triggering detachment of cancer cells. Our results demonstrate that separate analysis of floating and attached cancer cells might be important for evaluation of anti-cancer agents.
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Affiliation(s)
- Maruša Bizjak
- Group for nano and biotechnological applications, Faculty of Electrical Engineering, University of Ljubljana, Ljubljana, Slovenia
| | - Petra Malavašič
- Group for nano and biotechnological applications, Faculty of Electrical Engineering, University of Ljubljana, Ljubljana, Slovenia
| | - Klemen Dolinar
- Group for nano and biotechnological applications, Faculty of Electrical Engineering, University of Ljubljana, Ljubljana, Slovenia.,Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Jelka Pohar
- Department of Synthetic Biology and Immunology, National institute of Chemistry, Ljubljana, Slovenia.,Centre of Excellence EN-FIST, Ljubljana, Slovenia
| | - Sergej Pirkmajer
- Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Mojca Pavlin
- Group for nano and biotechnological applications, Faculty of Electrical Engineering, University of Ljubljana, Ljubljana, Slovenia. .,Institute of Biophysics, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia.
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Glucose Deprivation Induces ATF4-Mediated Apoptosis through TRAIL Death Receptors. Mol Cell Biol 2017; 37:MCB.00479-16. [PMID: 28242652 PMCID: PMC5477549 DOI: 10.1128/mcb.00479-16] [Citation(s) in RCA: 97] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 02/17/2017] [Indexed: 02/06/2023] Open
Abstract
Metabolic stress occurs frequently in tumors and in normal tissues undergoing transient ischemia. Nutrient deprivation triggers, among many potential cell death-inducing pathways, an endoplasmic reticulum (ER) stress response with the induction of the integrated stress response transcription factor ATF4. However, how this results in cell death remains unknown. Here we show that glucose deprivation triggered ER stress and induced the unfolded protein response transcription factors ATF4 and CHOP. This was associated with the nontranscriptional accumulation of TRAIL receptor 1 (TRAIL-R1) (DR4) and with the ATF4-mediated, CHOP-independent induction of TRAIL-R2 (DR5), suggesting that cell death in this context may involve death receptor signaling. Consistent with this, the ablation of TRAIL-R1, TRAIL-R2, FADD, Bid, and caspase-8 attenuated cell death, although the downregulation of TRAIL did not, suggesting ligand-independent activation of TRAIL receptors. These data indicate that stress triggered by glucose deprivation promotes the ATF4-dependent upregulation of TRAIL-R2/DR5 and TRAIL receptor-mediated cell death.
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Pakos-Zebrucka K, Koryga I, Mnich K, Ljujic M, Samali A, Gorman AM. The integrated stress response. EMBO Rep 2016; 17:1374-1395. [PMID: 27629041 DOI: 10.15252/embr.201642195] [Citation(s) in RCA: 1499] [Impact Index Per Article: 187.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Accepted: 08/23/2016] [Indexed: 02/06/2023] Open
Abstract
In response to diverse stress stimuli, eukaryotic cells activate a common adaptive pathway, termed the integrated stress response (ISR), to restore cellular homeostasis. The core event in this pathway is the phosphorylation of eukaryotic translation initiation factor 2 alpha (eIF2α) by one of four members of the eIF2α kinase family, which leads to a decrease in global protein synthesis and the induction of selected genes, including the transcription factor ATF4, that together promote cellular recovery. The gene expression program activated by the ISR optimizes the cellular response to stress and is dependent on the cellular context, as well as on the nature and intensity of the stress stimuli. Although the ISR is primarily a pro-survival, homeostatic program, exposure to severe stress can drive signaling toward cell death. Here, we review current understanding of the ISR signaling and how it regulates cell fate under diverse types of stress.
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Affiliation(s)
- Karolina Pakos-Zebrucka
- Apoptosis Research Centre, National University of Ireland Galway, Galway, Ireland School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Izabela Koryga
- Apoptosis Research Centre, National University of Ireland Galway, Galway, Ireland School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Katarzyna Mnich
- Apoptosis Research Centre, National University of Ireland Galway, Galway, Ireland School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Mila Ljujic
- Apoptosis Research Centre, National University of Ireland Galway, Galway, Ireland School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Afshin Samali
- Apoptosis Research Centre, National University of Ireland Galway, Galway, Ireland School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Adrienne M Gorman
- Apoptosis Research Centre, National University of Ireland Galway, Galway, Ireland School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
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Iurlaro R, Muñoz-Pinedo C. Cell death induced by endoplasmic reticulum stress. FEBS J 2015; 283:2640-52. [PMID: 26587781 DOI: 10.1111/febs.13598] [Citation(s) in RCA: 711] [Impact Index Per Article: 79.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 10/27/2015] [Accepted: 11/11/2015] [Indexed: 02/07/2023]
Abstract
The endoplasmic reticulum is an organelle with multiple functions. The synthesis of transmembrane proteins and proteins that are to be secreted occurs in this organelle. Many conditions that impose stress on cells, including hypoxia, starvation, infections and changes in secretory needs, challenge the folding capacity of the cell and promote endoplasmic reticulum stress. The cellular response involves the activation of sensors that transduce signaling cascades with the aim of restoring homeostasis. This is known as the unfolded protein response, which also intersects with the integrated stress response that reduces protein synthesis through inactivation of the initiation factor eIF2α. Central to the unfolded protein response are the sensors PERK, IRE1 and ATF6, as well as other signaling nodes such as c-Jun N-terminal kinase 1 (JNK) and the downstream transcription factors XBP1, ATF4 and CHOP. These proteins aim to restore homeostasis, but they can also induce cell death, which has been shown to occur by necroptosis and, more commonly, through the regulation of Bcl-2 family proteins (Bim, Noxa and Puma) that leads to mitochondrial apoptosis. In addition, endoplasmic reticulum stress and proteotoxic stress have been shown to induce TRAIL receptors and activation of caspase-8. Endoplasmic reticulum stress is a common feature in the pathology of numerous diseases because it plays a role in neurodegeneration, stroke, cancer, metabolic diseases and inflammation. Understanding how cells react to endoplasmic reticulum stress can accelerate discovery of drugs against these diseases.
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Affiliation(s)
- Raffaella Iurlaro
- Cell Death Regulation Group, Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat, Spain
| | - Cristina Muñoz-Pinedo
- Cell Death Regulation Group, Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat, Spain
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