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Garbarino O, Valenti GE, Monteleone L, Pietra G, Mingari MC, Benzi A, Bruzzone S, Ravera S, Leardi R, Farinini E, Vernazza S, Grottoli M, Marengo B, Domenicotti C. PLX4032 resistance of patient-derived melanoma cells: crucial role of oxidative metabolism. Front Oncol 2023; 13:1210130. [PMID: 37534247 PMCID: PMC10391174 DOI: 10.3389/fonc.2023.1210130] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 07/03/2023] [Indexed: 08/04/2023] Open
Abstract
Background Malignant melanoma is the most lethal form of skin cancer which shows BRAF mutation in 50% of patients. In this context, the identification of BRAFV600E mutation led to the development of specific inhibitors like PLX4032. Nevertheless, although its initial success, its clinical efficacy is reduced after six-months of therapy leading to cancer relapse due to the onset of drug resistance. Therefore, investigating the mechanisms underlying PLX4032 resistance is fundamental to improve therapy efficacy. In this context, several models of PLX4032 resistance have been developed, but the discrepancy between in vitro and in vivo results often limits their clinical translation. Methods The herein reported model has been realized by treating with PLX4032, for six months, patient-derived BRAF-mutated melanoma cells in order to obtain a reliable model of acquired PLX4032 resistance that could be predictive of patient's treatment responses. Metabolic analyses were performed by evaluating glucose consumption, ATP synthesis, oxygen consumption rate, P/O ratio, ATP/AMP ratio, lactate release, lactate dehydrogenase activity, NAD+/NADH ratio and pyruvate dehydrogenase activity in parental and drug resistant melanoma cells. The intracellular oxidative state was analyzed in terms of reactive oxygen species production, glutathione levels and NADPH/NADP+ ratio. In addition, a principal component analysis was conducted in order to identify the variables responsible for the acquisition of targeted therapy resistance. Results Collectively, our results demonstrate, for the first time in patient-derived melanoma cells, that the rewiring of oxidative phosphorylation and the maintenance of pyruvate dehydrogenase activity and of high glutathione levels contribute to trigger the onset of PLX4032 resistance. Conclusion Therefore, it is possible to hypothesize that inhibitors of glutathione biosynthesis and/or pyruvate dehydrogenase activity could be used in combination with PLX4032 to overcome drug resistance of BRAF-mutated melanoma patients. However, the identification of new adjuvant targets related to drug-induced metabolic reprogramming could be crucial to counteract the failure of targeted therapy in metastatic melanoma.
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Affiliation(s)
- Ombretta Garbarino
- Department of Experimental Medicine, General Pathology Section, University of Genoa, Genoa, Italy
| | - Giulia Elda Valenti
- Department of Experimental Medicine, General Pathology Section, University of Genoa, Genoa, Italy
| | - Lorenzo Monteleone
- Department of Experimental Medicine, General Pathology Section, University of Genoa, Genoa, Italy
| | - Gabriella Pietra
- Department of Experimental Medicine, General Pathology Section, University of Genoa, Genoa, Italy
- IRCCS Ospedale Policlinico San Martino, Genova, Italy
| | - Maria Cristina Mingari
- Department of Experimental Medicine, General Pathology Section, University of Genoa, Genoa, Italy
- IRCCS Ospedale Policlinico San Martino, Genova, Italy
| | - Andrea Benzi
- Department of Experimental Medicine, Biochemistry Section, University of Genoa, Genoa, Italy
| | - Santina Bruzzone
- IRCCS Ospedale Policlinico San Martino, Genova, Italy
- Department of Experimental Medicine, Biochemistry Section, University of Genoa, Genoa, Italy
| | - Silvia Ravera
- Department of Experimental Medicine, Human Anatomy Section, University of Genoa, Genoa, Italy
| | | | | | - Stefania Vernazza
- Department of Experimental Medicine, General Pathology Section, University of Genoa, Genoa, Italy
| | - Melania Grottoli
- Department of Experimental Medicine, General Pathology Section, University of Genoa, Genoa, Italy
| | - Barbara Marengo
- Department of Experimental Medicine, General Pathology Section, University of Genoa, Genoa, Italy
| | - Cinzia Domenicotti
- Department of Experimental Medicine, General Pathology Section, University of Genoa, Genoa, Italy
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2
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Hino C, Chan G, Jordaan G, Chang SS, Saunders JT, Bashir MT, Hansen JE, Gera J, Weisbart RH, Nishimura RN. Cellular protection from H 2O 2 toxicity by Fv-Hsp70: protection via catalase and gamma-glutamyl-cysteine synthase. Cell Stress Chaperones 2023; 28:429-439. [PMID: 37171750 PMCID: PMC10352194 DOI: 10.1007/s12192-023-01349-6] [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: 02/24/2023] [Revised: 04/19/2023] [Accepted: 04/23/2023] [Indexed: 05/13/2023] Open
Abstract
Heat shock proteins (HSPs), especially Hsp70 (HSPA1), have been associated with cellular protection from various cellular stresses including heat, hypoxia-ischemia, neurodegeneration, toxins, and trauma. Endogenous HSPs are often synthesized in direct response to these stresses but in many situations are inadequate in protecting cells. The present study addresses the transduction of Hsp70 into cells providing protection from acute oxidative stress by H2O2. The recombinant Fv-Hsp70 protein and two mutant Fv-Hsp70 proteins minus the ATPase domain and minus the ATPase and terminal lid domains were tested at 0.5 and 1.0 μM concentrations after two different concentrations of H2O2 treatment. All three recombinant proteins protected SH-SY5Y cells from acute H2O2 toxicity. This data indicated that the protein binding domain was responsible for cellular protection. In addition, experiments pretreating cells with inhibitors of antioxidant proteins catalase and gamma-glutamylcysteine synthase (GGCS) before H2O2 resulted in cell death despite treatment with Fv-Hsp70, implying that both enzymes were protected from acute oxidative stress after treatment with Fv-Hsp70. This study demonstrates that Fv-Hsp70 is protective in our experiments primarily by the protein-binding domain. The Hsp70 terminal lid domain was also not necessary for protection.
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Affiliation(s)
- Chris Hino
- Dept. of Internal Medicine, Loma Linda School of Medicine, Loma Linda, CA, 92350, USA
- VA Greater Los Angeles Healthcare System, North Hills, Los Angeles, CA, 91343, USA
| | - Grace Chan
- VA Greater Los Angeles Healthcare System, North Hills, Los Angeles, CA, 91343, USA
| | - Gwen Jordaan
- VA Greater Los Angeles Healthcare System, North Hills, Los Angeles, CA, 91343, USA
| | - Sophia S Chang
- VA Greater Los Angeles Healthcare System, North Hills, Los Angeles, CA, 91343, USA
| | - Jacquelyn T Saunders
- VA Greater Los Angeles Healthcare System, North Hills, Los Angeles, CA, 91343, USA
| | - Mohammad T Bashir
- VA Greater Los Angeles Healthcare System, North Hills, Los Angeles, CA, 91343, USA
- Dept. of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095, USA
| | - James E Hansen
- VA Greater Los Angeles Healthcare System, North Hills, Los Angeles, CA, 91343, USA
- Dept. of Therapeutic Radiology, Yale School of Medicine, New Haven, CT, 06520, USA
| | - Joseph Gera
- VA Greater Los Angeles Healthcare System, North Hills, Los Angeles, CA, 91343, USA
- Dept. of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095, USA
| | - Richard H Weisbart
- VA Greater Los Angeles Healthcare System, North Hills, Los Angeles, CA, 91343, USA
- Dept. of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095, USA
| | - Robert N Nishimura
- VA Greater Los Angeles Healthcare System, North Hills, Los Angeles, CA, 91343, USA.
- Dept. of Neurology, David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095, USA.
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NEK6 Regulates Redox Balance and DNA Damage Response in DU-145 Prostate Cancer Cells. Cells 2023; 12:cells12020256. [PMID: 36672191 PMCID: PMC9856815 DOI: 10.3390/cells12020256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 12/08/2022] [Accepted: 12/22/2022] [Indexed: 01/10/2023] Open
Abstract
NEK6 is a central kinase in developing castration-resistant prostate cancer (CRPC). However, the pathways regulated by NEK6 in CRPC are still unclear. Cancer cells have high reactive oxygen species (ROS) levels and easily adapt to this circumstance and avoid cell death by increasing antioxidant defenses. We knocked out the NEK6 gene and evaluated the redox state and DNA damage response in DU-145 cells. The knockout of NEK6 decreases the clonogenic capacity, proliferation, cell viability, and mitochondrial activity. Targeting the NEK6 gene increases the level of intracellular ROS; decreases the expression of antioxidant defenses (SOD1, SOD2, and PRDX3); increases JNK phosphorylation, a stress-responsive kinase; and increases DNA damage markers (p-ATM and γH2AX). The exogenous overexpression of NEK6 also increases the expression of these same antioxidant defenses and decreases γH2AX. The depletion of NEK6 also induces cell death by apoptosis and reduces the antiapoptotic Bcl-2 protein. NEK6-lacking cells have more sensitivity to cisplatin. Additionally, NEK6 regulates the nuclear localization of NF-κB2, suggesting NEK6 may regulate NF-κB2 activity. Therefore, NEK6 alters the redox balance, regulates the expression of antioxidant proteins and DNA damage, and its absence induces the death of DU-145 cells. NEK6 inhibition may be a new strategy for CRPC therapy.
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Hormesis and Oxidative Distress: Pathophysiology of Reactive Oxygen Species and the Open Question of Antioxidant Modulation and Supplementation. Antioxidants (Basel) 2022; 11:antiox11081613. [PMID: 36009331 PMCID: PMC9405171 DOI: 10.3390/antiox11081613] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 08/14/2022] [Accepted: 08/17/2022] [Indexed: 11/24/2022] Open
Abstract
Alterations of redox homeostasis leads to a condition of resilience known as hormesis that is due to the activation of redox-sensitive pathways stimulating cell proliferation, growth, differentiation, and angiogenesis. Instead, supraphysiological production of reactive oxygen species (ROS) exceeds antioxidant defence and leads to oxidative distress. This condition induces damage to biomolecules and is responsible or co-responsible for the onset of several chronic pathologies. Thus, a dietary antioxidant supplementation has been proposed in order to prevent aging, cardiovascular and degenerative diseases as well as carcinogenesis. However, this approach has failed to demonstrate efficacy, often leading to harmful side effects, in particular in patients affected by cancer. In this latter case, an approach based on endogenous antioxidant depletion, leading to ROS overproduction, has shown an interesting potential for enhancing susceptibility of patients to anticancer therapies. Therefore, a deep investigation of molecular pathways involved in redox balance is crucial in order to identify new molecular targets useful for the development of more effective therapeutic approaches. The review herein provides an overview of the pathophysiological role of ROS and focuses the attention on positive and negative aspects of antioxidant modulation with the intent to find new insights for a successful clinical application.
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5
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Monteleone L, Marengo B, Musumeci F, Grossi G, Carbone A, Valenti GE, Domenicotti C, Schenone S. Anti-Survival Effect of SI306 and Its Derivatives on Human Glioblastoma Cells. Pharmaceutics 2022; 14:pharmaceutics14071399. [PMID: 35890294 PMCID: PMC9318396 DOI: 10.3390/pharmaceutics14071399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 06/29/2022] [Accepted: 06/30/2022] [Indexed: 02/04/2023] Open
Abstract
Glioblastoma (GBM) is the most common adult brain tumor and, although many efforts have been made to find valid therapies, the onset of resistance is the main cause of recurrence. Therefore, it is crucial to identify and target the molecular mediators responsible for GBM malignancy. In this context, the use of Src inhibitors such as SI306 (C1) and its prodrug (C2) showed promising results, suggesting that SI306 could be the lead compound useful to derivate new anti-GBM drugs. Therefore, a new prodrug of SI306 (C3) was synthesized and tested on CAS-1 and U87 human GBM cells by comparing its effect to that of C1 and C2. All compounds were more effective on CAS-1 than U87 cells, while C2 was the most active on both cell lines. Moreover, the anti-survival effect was associated with a reduction in the expression of epidermal growth factor receptor (EGFR)WT and EGFR-vIII in U87 and CAS-1 cells, respectively. Collectively, our findings demonstrate that all tested compounds are able to counteract GBM survival, further supporting the role of SI306 as progenitor of promising new drugs to treat malignant GBM.
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Affiliation(s)
- Lorenzo Monteleone
- Department of Experimental Medicine (DIMES), General Pathology Section, University of Genoa, 16132 Genoa, Italy; (L.M.); (B.M.); (G.E.V.)
| | - Barbara Marengo
- Department of Experimental Medicine (DIMES), General Pathology Section, University of Genoa, 16132 Genoa, Italy; (L.M.); (B.M.); (G.E.V.)
- Inter-University Center for the Promotion of the 3Rs Principles in Teaching & Research (Centro 3R), 56122 Pisa, Italy
| | - Francesca Musumeci
- Department of Pharmacy, University of Genoa, 16132 Genoa, Italy; (F.M.); (G.G.); (A.C.); (S.S.)
| | - Giancarlo Grossi
- Department of Pharmacy, University of Genoa, 16132 Genoa, Italy; (F.M.); (G.G.); (A.C.); (S.S.)
| | - Anna Carbone
- Department of Pharmacy, University of Genoa, 16132 Genoa, Italy; (F.M.); (G.G.); (A.C.); (S.S.)
| | - Giulia E. Valenti
- Department of Experimental Medicine (DIMES), General Pathology Section, University of Genoa, 16132 Genoa, Italy; (L.M.); (B.M.); (G.E.V.)
| | - Cinzia Domenicotti
- Department of Experimental Medicine (DIMES), General Pathology Section, University of Genoa, 16132 Genoa, Italy; (L.M.); (B.M.); (G.E.V.)
- Inter-University Center for the Promotion of the 3Rs Principles in Teaching & Research (Centro 3R), 56122 Pisa, Italy
- Correspondence: ; Tel.: +39-010-353-8830
| | - Silvia Schenone
- Department of Pharmacy, University of Genoa, 16132 Genoa, Italy; (F.M.); (G.G.); (A.C.); (S.S.)
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PKCα Inhibition as a Strategy to Sensitize Neuroblastoma Stem Cells to Etoposide by Stimulating Ferroptosis. Antioxidants (Basel) 2021; 10:antiox10050691. [PMID: 33924765 PMCID: PMC8145544 DOI: 10.3390/antiox10050691] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 04/19/2021] [Accepted: 04/24/2021] [Indexed: 12/18/2022] Open
Abstract
Cancer stem cells (CSCs) are a limited cell population inside a tumor bulk characterized by high levels of glutathione (GSH), the most important antioxidant thiol of which cysteine is the limiting amino acid for GSH biosynthesis. In fact, CSCs over-express xCT, a cystine transporter stabilized on cell membrane through interaction with CD44, a stemness marker whose expression is modulated by protein kinase Cα (PKCα). Since many chemotherapeutic drugs, such as Etoposide, exert their cytotoxic action by increasing reactive oxygen species (ROS) production, the presence of high antioxidant defenses confers to CSCs a crucial role in chemoresistance. In this study, Etoposide-sensitive and -resistant neuroblastoma CSCs were chronically treated with Etoposide, given alone or in combination with Sulfasalazine (SSZ) or with an inhibitor of PKCα (C2-4), which target xCT directly or indirectly, respectively. Both combined approaches are able to sensitize CSCs to Etoposide by decreasing intracellular GSH levels, inducing a metabolic switch from OXPHOS to aerobic glycolysis, down-regulating glutathione-peroxidase-4 activity and stimulating lipid peroxidation, thus leading to ferroptosis. Our results suggest, for the first time, that PKCα inhibition inducing ferroptosis might be a useful strategy with which to fight CSC chemoresistance.
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7
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Biological evaluation of pyrazolyl-urea and dihydro-imidazo-pyrazolyl-urea derivatives as potential anti-angiogenetic agents in the treatment of neuroblastoma. Oncotarget 2020; 11:3459-3472. [PMID: 32973970 PMCID: PMC7500105 DOI: 10.18632/oncotarget.27733] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 08/11/2020] [Indexed: 12/05/2022] Open
Abstract
Pyrazolyl-urea and dihydro-imidazo-pyrazolyl-urea compounds (STIRUR 13, STIRUR 41 and BUR 12) have been demonstrated to exert a strong inhibitory effect on interleukin 8 or N-formyl-methionyl-leucyl-phenylalanine-induced chemotaxis of human neutrophils. Since the migration of cancer cells is comparable to that of neutrophils, the purpose of this study is to evaluate the biological effect of STIRUR 13, STIRUR 41 and BUR 12 on ACN and HTLA-230, two neuroblastoma (NB) cell lines with different degree of malignancy. HTLA-230 cells, stage-IV NB cells, have high plasticity and can serve as progenitors of endothelial cells. The results herein reported show that the three tested compounds were not cytotoxic for both NB cells and did not alter their clonogenic potential. However, all compounds were able to inhibit the ability of HTLA-230 to form vascular-like structures. On the basis of these findings, pyrazolyl-urea and dihydro-imidazo-pyrazolyl-urea derivatives could be proposed as agents potentially effective in counteracting NB malignancy by inhibiting cell migration and tumor angiogenesis which represent important hallmarks responsible for cancer survival and progression.
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8
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Lenkavska L, Tomkova S, Horvath D, Huntosova V. Searching for combination therapy by clustering methods: Stimulation of PKC in Golgi apparatus combined with hypericin induced PDT. Photodiagnosis Photodyn Ther 2020; 31:101813. [PMID: 32442674 DOI: 10.1016/j.pdpdt.2020.101813] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 04/28/2020] [Accepted: 05/04/2020] [Indexed: 02/07/2023]
Abstract
Cancer cell metabolism is a very attractive target for anticancer treatments. This work focuses on protein kinase C (PKC) signaling in the U87 MG glioma. By means of western blot, fluorescence and time-resolved fluorescence microscopy the correlation between the Golgi apparatus (GA), lysosomes and mitochondria were evaluated. The known regulators of PKC were applied to cancer cells. Phorbol myristate acetate (PMA) was chosen as the activator of PKC. Gö6976, hypericin and rottlerin, the inhibitors of PKCα and PKCδ were selected as well. Stabilization, destabilization processes occurring in cells allow classification of observations into several groups. Multiple versions of hierarchical cluster analysis have been applied and similarities have been found between organelles and PKC regulators. The method identified GA as an extraordinary organelle whose functionality is significantly influenced by PKC regulators as well as oxidative stress. Therefore, combination therapy has been designed according to the results of the cluster analysis. Furthermore, the efficacy of photodynamic therapy mediated by hypericin, and the consequent apoptosis, was significantly increased during the treatment. To our knowledge, this is the first demonstration of the effectiveness of the clustering in the given area.
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Affiliation(s)
- Lenka Lenkavska
- Department of Biophysics, Faculty of Science, P. J. Safarik University in Kosice, 041 54, Kosice, Slovakia.
| | - Silvia Tomkova
- Department of Biophysics, Faculty of Science, P. J. Safarik University in Kosice, 041 54, Kosice, Slovakia.
| | - Denis Horvath
- Center for Interdisciplinary Biosciences, Technology and Innovation Park, P.J. Safarik University in Kosice, 041 54, Kosice, Slovakia.
| | - Veronika Huntosova
- Center for Interdisciplinary Biosciences, Technology and Innovation Park, P.J. Safarik University in Kosice, 041 54, Kosice, Slovakia.
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9
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MYC Expression and Metabolic Redox Changes in Cancer Cells: A Synergy Able to Induce Chemoresistance. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:7346492. [PMID: 31341534 PMCID: PMC6614970 DOI: 10.1155/2019/7346492] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 06/10/2019] [Accepted: 06/17/2019] [Indexed: 12/26/2022]
Abstract
Chemoresistance is due to multiple factors including the induction of a metabolic adaptation of tumor cells. In fact, in these cells, stress conditions induced by therapies stimulate a metabolic reprogramming which involves the strengthening of various pathways such as glycolysis, glutaminolysis and the pentose phosphate pathway. This metabolic reprogramming is the result of a complex network of mechanisms that, through the activation of oncogenes (i.e., MYC, HIF1, and PI3K) or the downregulation of tumor suppressors (i.e., TP53), induces an increased expression of glucose and/or glutamine transporters and of glycolytic enzymes. Therefore, in order to overcome chemoresistance, it is necessary to develop combined therapies which are able to selectively and simultaneously act on the multiple molecular targets responsible for this adaptation. This review is focused on highlighting the role of MYC in modulating the epigenetic redox changes which are crucial in the acquisition of therapy resistance.
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10
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Zhang J, Geng H, Liu L, Zhang H. Synergistic cytotoxicity of homoharringtonine and etoposide in acute myeloid leukemia cells involves disrupted antioxidant defense. Cancer Manag Res 2019; 11:1023-1032. [PMID: 30774430 PMCID: PMC6349074 DOI: 10.2147/cmar.s187597] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Background/Aims Cytotoxicity induced by reactive oxygen species (ROS) is critical for the effectiveness of chemotherapeutic drugs used in the treatment of acute myeloid leukemia (AML). This study aimed to investigate whether ROS contributes to cytotoxicity in AML cells when treated with homoharringtonine (HHT) and etoposide (ETP) in combination. Methods AML cell lines THP1 and HL60 and primary AML cells from patients were treated with HHT and ETP alone or in combination, and cell viability was determined by trypan blue exclusion test, and apoptosis was analyzed by annexin-V/propidium iodide double staining as well as Western blot for measuring expression of cleaved caspase-9 and cleaved caspase-3. Intracellular ROS level was detected by DCFH-DA fluorescence assay, and N-Acetyl-L-cysteine (NAC) was used to scavenge intracellular ROS. Retroviral infection was applied to mediate stable overexpression in AML cells. Results We show that HHT and ETP exhibit synergistic cytotoxicity in AML cell lines and primary AML cells in vitro, and meanwhile, HHT causes elevated ROS generation in ETP-treated AML cells. We next reveal that the elevated ROS is a critical factor for the synergistic cytotoxicity, since ROS scavenge by NAC remarkably diminishes this effect. Mechanistically, we demonstrate that HHT causes elevated ROS generation by disabling thioredoxin-mediated antioxidant defense. Finally, similar to HHT treatment, depletion of thioredoxin sensitizes AML to ETP treatment. Conclusion These results provide the foundation for augmenting the efficacy of ETP in treating AML with HHT, and also highlight the importance of targeting ROS in improving treatment outcome in AML.
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Affiliation(s)
- Jingjing Zhang
- Department of Hematology, Affiliated Hospital of Jining Medical University, Jining 272029, Shandong Province, China,
| | - Huayun Geng
- Department of Hematology, Dongchangfu People's Hospital of Liaocheng, Liaocheng 252000, Shandong Province, China
| | - Ling Liu
- Department of Hematology, Affiliated Hospital of Jining Medical University, Jining 272029, Shandong Province, China,
| | - Hao Zhang
- Department of Hematology, Affiliated Hospital of Jining Medical University, Jining 272029, Shandong Province, China,
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Colla R, Izzotti A, De Ciucis C, Fenoglio D, Ravera S, Speciale A, Ricciarelli R, Furfaro AL, Pulliero A, Passalacqua M, Traverso N, Pronzato MA, Domenicotti C, Marengo B. Glutathione-mediated antioxidant response and aerobic metabolism: two crucial factors involved in determining the multi-drug resistance of high-risk neuroblastoma. Oncotarget 2018; 7:70715-70737. [PMID: 27683112 PMCID: PMC5342585 DOI: 10.18632/oncotarget.12209] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Accepted: 09/13/2016] [Indexed: 12/24/2022] Open
Abstract
Neuroblastoma, a paediatric malignant tumor, is initially sensitive to etoposide, a drug to which many patients develop chemoresistance. In order to investigate the molecular mechanisms responsible for etoposide chemoresistance, HTLA-230, a human MYCN-amplified neuroblastoma cell line, was chronically treated with etoposide at a concentration that in vitro mimics the clinically-used dose. The selected cells (HTLA-Chr) acquire multi-drug resistance (MDR), becoming less sensitive than parental cells to high doses of etoposide or doxorubicin. MDR is due to several mechanisms that together contribute to maintaining non-toxic levels of H2O2. In fact, HTLA-Chr cells, while having an efficient aerobic metabolism, are also characterized by an up-regulation of catalase activity and higher levels of reduced glutathione (GSH), a thiol antioxidant compound. The combination of such mechanisms contributes to prevent membrane lipoperoxidation and cell death. Treatment of HTLA-Chr cells with L-Buthionine-sulfoximine, an inhibitor of GSH biosynthesis, markedly reduces their tumorigenic potential that is instead enhanced by the exposure to N-Acetylcysteine, able to promote GSH synthesis. Collectively, these results demonstrate that GSH and GSH-related responses play a crucial role in the acquisition of MDR and suggest that GSH level monitoring is an efficient strategy to early identify the onset of drug resistance and to control the patient's response to therapy.
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Affiliation(s)
- Renata Colla
- Department of Experimental Medicine, University of Genova, Genova, Italy
| | - Alberto Izzotti
- Department of Health Sciences, University of Genova, Genova, Italy.,IRCCS AOU San Martino IST Genova, Genova, Italy
| | - Chiara De Ciucis
- Department of Experimental Medicine, University of Genova, Genova, Italy
| | - Daniela Fenoglio
- Center of Excellence for Biomedical Research, Department of Internal Medicine, University of Genova, Genova, Italy
| | - Silvia Ravera
- Department of Pharmacy, University of Genova, Genova, Italy
| | - Andrea Speciale
- Department of Experimental Medicine, University of Genova, Genova, Italy
| | | | | | | | - Mario Passalacqua
- Department of Experimental Medicine, University of Genova, Genova, Italy
| | - Nicola Traverso
- Department of Experimental Medicine, University of Genova, Genova, Italy
| | | | - Cinzia Domenicotti
- Department of Experimental Medicine, University of Genova, Genova, Italy
| | - Barbara Marengo
- Department of Experimental Medicine, University of Genova, Genova, Italy
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12
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Marengo B, Speciale A, Senatore L, Garibaldi S, Musumeci F, Nieddu E, Pollarolo B, Pronzato MA, Schenone S, Mazzei M, Domenicotti C. Matrine in association with FD‑2 stimulates F508del‑cystic fibrosis transmembrane conductance regulator activity in the presence of corrector VX809. Mol Med Rep 2017; 16:8849-8853. [PMID: 29039559 PMCID: PMC5779973 DOI: 10.3892/mmr.2017.7736] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Accepted: 07/27/2017] [Indexed: 01/12/2023] Open
Abstract
Cystic fibrosis is caused by mutations of the cystic fibrosis transmembrane conductance regulator (CFTR) gene, and the predominant mutation is termed Phe508del (F508del). Therapy for F508del‑CFTR patients is based on the use of Orkambi®, a combination of VX809 and VX770. However, though Orkambi leads to an improvement in the lung function of patients, a progressive reduction in its efficacy has been observed. In order to overcome this effect, the aim of the present study was to investigate the role of matrine and the in‑house compound FD‑2 in increasing the action of VX809 and VX770. Fischer rat thyroid cells overexpressing F508del‑CFTR were treated with matrine, VX809 (corrector) and/or with a number of potentiators (VX770, FD‑1 and FD‑2). The results demonstrated that matrine was able to stimulate CFTR activity and, in association with FD‑2, increased the functionality of the channel in the presence of VX809. Based on these results, it may be hypothesized that FD‑2 may be a novel and more effective potentiator compared with VX770.
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Affiliation(s)
- Barbara Marengo
- Department of Experimental Medicine, University of Genoa, I‑16132 Genoa, Italy
| | - Andrea Speciale
- Department of Experimental Medicine, University of Genoa, I‑16132 Genoa, Italy
| | - Lisa Senatore
- Department of Experimental Medicine, University of Genoa, I‑16132 Genoa, Italy
| | - Silvano Garibaldi
- Division of Cardiology, IRCCS University Hospital San Martino, Research Centre of Cardiovascular Biology, University of Genoa, I‑16132 Genoa, Italy
| | | | - Erika Nieddu
- Department of Pharmacy, University of Genoa, I‑16132 Genoa, Italy
| | | | | | - Silvia Schenone
- Department of Pharmacy, University of Genoa, I‑16132 Genoa, Italy
| | - Mauro Mazzei
- Department of Pharmacy, University of Genoa, I‑16132 Genoa, Italy
| | - Cinzia Domenicotti
- Department of Experimental Medicine, University of Genoa, I‑16132 Genoa, Italy
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Ndombera FT. Anti-cancer agents and reactive oxygen species modulators that target cancer cell metabolism. PURE APPL CHEM 2017. [DOI: 10.1515/pac-2016-1219] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
AbstractTraditionally the perspective on reactive oxygen species (ROS) has centered on the role they play as carcinogenic or cancer-causing radicals. Over the years, characterization and functional studies have revealed the complexity of ROS as signaling molecules that regulate various physiological cellular responses or whose levels are altered in various diseases. Cancer cells often maintain high basal level of ROS and are vulnerable to any further increase in ROS levels beyond a certain protective threshold. Consequently, ROS-modulation has emerged as an anticancer strategy with synthesis of various ROS-inducing or responsive agents that target cancer cells. Of note, an increased carbohydrate uptake and/or induction of death receptors of cancer cells was exploited to develop glycoconjugates that potentially induce cellular stress, ROS and apoptosis. This mini review highlights the development of compounds that target cancer cells by taking advantage of redox or metabolic alteration in cancer cells.
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3-bromopyruvate and buthionine sulfoximine effectively kill anoikis-resistant hepatocellular carcinoma cells. PLoS One 2017; 12:e0174271. [PMID: 28362858 PMCID: PMC5376082 DOI: 10.1371/journal.pone.0174271] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 03/06/2017] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND & AIMS Acquisition of anoikis resistance is a prerequisite for metastasis in hepatocellular carcinoma (HCC). However, little is known about how energy metabolism and antioxidant systems are altered in anoikis-resistant (AR) HCC cells. We evaluated anti-tumor effects of a combination treatment of 3-bromopyruvate (3-BP) and buthionine sulfoximine (BSO) in AR HCC cells. METHODS We compared glycolysis, reactive oxygen species (ROS) production, and chemoresistance among Huh-BAT, HepG2 HCC cells, and the corresponding AR cells. Expression of hexokinase II, gamma-glutamylcysteine synthetase (rGCS), and epithelial-mesenchymal transition (EMT) markers in AR cells was assessed. Anti-tumor effects of a combination treatment of 3-BP and BSO were evaluated in AR cells and an HCC xenograft mouse model. RESULTS AR HCC cells showed significantly higher chemoresistance, glycolysis and lower ROS production than attached cells. Expression of hexokinase II, rGCS, and EMT markers was higher in AR HCC cells than attached cells. A combination treatment of 3-BP/BSO effectively suppressed proliferation of AR HCC cells through apoptosis by blocking glycolysis and enhancing ROS levels. In xenograft mouse models, tumor growth derived from AR HCC cells was significantly suppressed in the group treated with 3-BP/BSO compared to the group treated with 3-BP or sorafenib. CONCLUSIONS These results demonstrated that a combination treatment of 3-BP/BSO had a synergistic anti-tumor effect in an AR HCC model. This strategy may be an effective adjuvant therapy for patients with sorafenib-resistant HCC.
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Lee KI, Su CC, Yang CY, Hung DZ, Lin CT, Lu TH, Liu SH, Huang CF. Etoposide induces pancreatic β-cells cytotoxicity via the JNK/ERK/GSK-3 signaling-mediated mitochondria-dependent apoptosis pathway. Toxicol In Vitro 2016; 36:142-152. [PMID: 27473919 DOI: 10.1016/j.tiv.2016.07.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 04/18/2016] [Accepted: 07/25/2016] [Indexed: 01/10/2023]
Abstract
Etoposide is widely used in the treatment of the different types of tumors such as pancreatic cancer. However, etoposide also causes several unwanted side-effects in normal viable cells, including pancreatic β-cells, which are vulnerable to chemical-induced injuries, and the molecular mechanisms underlying etoposide-induced apoptosis are still unclear. Here, the results showed that in RIN-m5F cells (a β-cell-derived cell line), the number of viable cells was significantly decreased after 24h of etoposide treatment and underwent mitochondria-dependent apoptotic signals accompanied by mitochondrial dysfunction, and increases in the population of sub-G1 hypodiploid cells and apoptotic cells, caspase-3 activity, and the activation of caspase cascades. Etoposide also increased the phosphorylation levels of glycogen synthase kinase (GSK)-3α/β in treated RIN-m5F cells. Pretreatment with LiCl, a GSK-3 inhibitor, prevented etoposide-induced mitochondria-dependent apoptosis and GSK-3 protein phosphorylation in RIN-m5F cells. Furthermore, exposure of the cells to etoposide induced the phosphorylation of c-Jun N-terminal kinase (JNK) and extracellular signal-related kinase (ERK)1/2 but not p38-MAPK, which was suppressed by the specific JNK inhibitor (SP600125) and ERK1/2 inhibitor (PD98059), respectively. Additionally, pretreatment with both SP600125 and PD98059 effectively suppressed etoposide-induced β-cell cytotoxicity, apoptosis, and GSK-3 protein phosphorylation; however, LiCl did not reverse JNK and ERK1/2 phosphorylation. Taken together, these results suggest that etoposide is capable of causing cytotoxicity on pancreatic β-cells by inducing apoptosis through the JNK/ERK-mediated GSK-3 downstream-triggered mitochondria-dependent signaling pathway.
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Affiliation(s)
- Kuan-I Lee
- Department of Emergency, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung 427, Taiwan
| | - Chin-Chuan Su
- Graduate Institute of Basic Medical Science, College of Medicine, China Medical University, Taichung 404, Taiwan; Department of Otorhinolaryngology, Head and Neck Surgery, Changhua Christian Hospital, Changhua County 500, Taiwan
| | - Ching-Yao Yang
- Department of Surgery, National Taiwan University Hospital, Taipei 100, Taiwan; Department of Surgery, College of Medicine, National Taiwan University, Taipei 100, Taiwan
| | - Dong-Zong Hung
- Division of Toxicology, Trauma & Emergency Center, China Medical University Hospital, Taichung 404, Taiwan
| | - Ching-Ting Lin
- School of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung 404, Taiwan
| | - Tien-Hui Lu
- Department of Physiology, and Graduate Institute of Basic Medical Science, College of Medicine, China Medical University, Taichung 404, Taiwan
| | - Shing-Hwa Liu
- Institute of Toxicology, College of Medicine, National Taiwan University, Taipei 100, Taiwan.
| | - Chun-Fa Huang
- School of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung 404, Taiwan; Department of Nursing, College of Medical and Health Science, Asia University, Taichung 413, Taiwan.
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Redox Homeostasis and Cellular Antioxidant Systems: Crucial Players in Cancer Growth and Therapy. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2016; 2016:6235641. [PMID: 27418953 PMCID: PMC4932173 DOI: 10.1155/2016/6235641] [Citation(s) in RCA: 184] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Accepted: 05/18/2016] [Indexed: 02/07/2023]
Abstract
Reactive oxygen species (ROS) and their products are components of cell signaling pathways and play important roles in cellular physiology and pathophysiology. Under physiological conditions, cells control ROS levels by the use of scavenging systems such as superoxide dismutases, peroxiredoxins, and glutathione that balance ROS generation and elimination. Under oxidative stress conditions, excessive ROS can damage cellular proteins, lipids, and DNA, leading to cell damage that may contribute to carcinogenesis. Several studies have shown that cancer cells display an adaptive response to oxidative stress by increasing expression of antioxidant enzymes and molecules. As a double-edged sword, ROS influence signaling pathways determining beneficial or detrimental outcomes in cancer therapy. In this review, we address the role of redox homeostasis in cancer growth and therapy and examine the current literature regarding the redox regulatory systems that become upregulated in cancer and their role in promoting tumor progression and resistance to chemotherapy.
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Roth SA, Knutsen E, Fiskaa T, Utnes P, Bhavsar S, Hald ØH, Løkke C, Mestdagh P, Johansen SD, Flægstad T, Einvik C. Next generation sequencing of microRNAs from isogenic neuroblastoma cell lines isolated before and after treatment. Cancer Lett 2015; 372:128-36. [PMID: 26708804 DOI: 10.1016/j.canlet.2015.11.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Revised: 11/16/2015] [Accepted: 11/17/2015] [Indexed: 10/22/2022]
Abstract
Neuroblastoma is a pediatric cancer of the developing sympathetic nervous system. High risk neuroblastoma patients typically undergo an initial remission in response to treatment, followed by recurrence of aggressive tumors that have become refractory to further treatment. Recent works have underlined the involvement of microRNAs (miRNAs) in neuroblastoma development and evolution of drug resistance. In this study we have used deep sequencing technology to identify miRNAs differentially expressed in neuroblastoma cell lines isolated from 6 patients at diagnosis and at relapse after intensive treatments. This approach revealed a panel of 42 differentially expressed miRNAs, 8 of which were upregulated and 34 were downregulated. Most strikingly, the 14q32 miRNA clusters encode 22 of the downregulated miRNAs. Reduced expression of 14q32 miRNAs in tumors associated with poor prognosis factors was confirmed in a cohort consisting of 226 primary neuroblastomas. In order to gain insight into the nature of the genes that may be affected by the differentially expressed miRNAs we utilized Ingenuity Pathway Analysis (IPA). This analysis revealed several biological functions and canonical pathways associated with cancer progression and drug resistance. The results of this study contribute to the identification of miRNAs involved in the complex processes of surviving therapeutic treatment and developing drug resistance in neuroblastoma.
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Affiliation(s)
- Sarah Andrea Roth
- Pediatric Research Group, Department of Clinical Medicine, Faculty of Health Science, The Arctic University of Norway - UiT, NO-9037 Tromsø, Norway
| | - Erik Knutsen
- RNA and Molecular Pathology (RAMP), Department of Medical Biology, Faculty of Health Sciences, The Arctic University of Norway - UiT, NO-9037 Tromsø, Norway
| | - Tonje Fiskaa
- RNA and Molecular Pathology (RAMP), Department of Medical Biology, Faculty of Health Sciences, The Arctic University of Norway - UiT, NO-9037 Tromsø, Norway
| | - Peter Utnes
- Department of Pediatrics, Division of Child and Adolescent Health, UNN - University Hospital of North-Norway, NO-9038 Tromsø, Norway
| | - Swapnil Bhavsar
- Pediatric Research Group, Department of Clinical Medicine, Faculty of Health Science, The Arctic University of Norway - UiT, NO-9037 Tromsø, Norway
| | - Øyvind H Hald
- Department of Pediatrics, Division of Child and Adolescent Health, UNN - University Hospital of North-Norway, NO-9038 Tromsø, Norway
| | - Cecilie Løkke
- Pediatric Research Group, Department of Clinical Medicine, Faculty of Health Science, The Arctic University of Norway - UiT, NO-9037 Tromsø, Norway
| | - Pieter Mestdagh
- Center for Medical Genetics Ghent, Ghent University, Ghent, Belgium
| | - Steinar D Johansen
- RNA and Molecular Pathology (RAMP), Department of Medical Biology, Faculty of Health Sciences, The Arctic University of Norway - UiT, NO-9037 Tromsø, Norway; Marine Genomics Group, Faculty of Biosciences and Aquaculture, University of Nordland, Bodø, Norway
| | - Trond Flægstad
- Pediatric Research Group, Department of Clinical Medicine, Faculty of Health Science, The Arctic University of Norway - UiT, NO-9037 Tromsø, Norway; Department of Pediatrics, Division of Child and Adolescent Health, UNN - University Hospital of North-Norway, NO-9038 Tromsø, Norway
| | - Christer Einvik
- Pediatric Research Group, Department of Clinical Medicine, Faculty of Health Science, The Arctic University of Norway - UiT, NO-9037 Tromsø, Norway; Department of Pediatrics, Division of Child and Adolescent Health, UNN - University Hospital of North-Norway, NO-9038 Tromsø, Norway.
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Shin EJ, Nam Y, Tu THT, Lim YK, Wie MB, Kim DJ, Jeong JH, Kim HC. Protein kinase Cδ mediates trimethyltin-induced neurotoxicity in mice in vivo via inhibition of glutathione defense mechanism. Arch Toxicol 2015; 90:937-53. [PMID: 25895139 DOI: 10.1007/s00204-015-1516-7] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2014] [Accepted: 03/31/2015] [Indexed: 12/11/2022]
Abstract
We investigated whether protein kinase C (PKC) is involved in trimethyltin (TMT)-induced neurotoxicity. TMT treatment (2.8 mg/kg, i.p.) significantly increased PKCδ expression out of PKC isozymes (i.e., α, βI, βII, δ, and ς) in the hippocampus of wild-type (WT) mice. Consistently, treatment with TMT resulted in significant increases in cleaved PKCδ expression. Genetic or pharmacological inhibition (PKCδ knockout or rottlerin) was less susceptible to TMT-induced seizures than WT mice. TMT treatment increased glutathione oxidation, lipid peroxidation, protein oxidation, and levels of reactive oxygen species. These effects were more pronounced in the WT mice than in PKCδ knockout mice. In addition, the ability of TMT to induce nuclear translocation of Nrf2, Nrf2 DNA-binding activity, and upregulation of γ-glutamylcysteine ligase was significantly increased in the PKCδ knockout mice and rottlerin (10 or 20 mg/kg, p.o. × 6)-treated WT mice. Furthermore, neuronal degeneration (as shown by nuclear chromatin clumping and TUNEL staining) in WT mice was most pronounced 2 days after TMT. At the same time, TMT-induced inhibition of phosphoinositol 3-kinase (PI3K)/Akt signaling was evident, thereby decreasing phospho-Bad, expression of Bcl-xL and Bcl-2, and the interaction between phospho-Bad and 14-3-3 protein, and increasing Bax expression and caspase-3 cleavage were observed. Rottlerin or PKCδ knockout significantly protected these changes in anti- and pro-apoptotic factors. Importantly, treatment of the PI3K inhibitor LY294002 (0.8 or 1.6 µg, i.c.v.) 4 h before TMT counteracted protective effects (i.e., Nrf-2-dependent glutathione induction and pro-survival phenomenon) of rottlerin. Therefore, our results suggest that down-regulation of PKCδ and up-regulations of Nrf2-dependent glutathione defense mechanism and PI3K/Akt signaling are critical for attenuating TMT neurotoxicity.
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Affiliation(s)
- Eun-Joo Shin
- Neuropsychopharmacology and Toxicology Program, College of Pharmacy, Kangwon National University, Chunchon, 200-701, Republic of Korea
| | - Yunsung Nam
- Neuropsychopharmacology and Toxicology Program, College of Pharmacy, Kangwon National University, Chunchon, 200-701, Republic of Korea
| | - Thu-Hien Thi Tu
- Neuropsychopharmacology and Toxicology Program, College of Pharmacy, Kangwon National University, Chunchon, 200-701, Republic of Korea
| | - Yong Kwang Lim
- Neuropsychopharmacology and Toxicology Program, College of Pharmacy, Kangwon National University, Chunchon, 200-701, Republic of Korea
| | - Myung-Bok Wie
- School of Veterinary Medicine, Kangwon National University, Chunchon, 200-701, Republic of Korea
| | - Dae-Joong Kim
- Department of Anatomy and Cell Biology, Medical School, Kangwon National University, Chunchon, 200-701, Republic of Korea
| | - Ji Hoon Jeong
- Department of Pharmacology, College of Medicine, Chung-Ang University, Seoul, 156-756, Republic of Korea
| | - Hyoung-Chun Kim
- Neuropsychopharmacology and Toxicology Program, College of Pharmacy, Kangwon National University, Chunchon, 200-701, Republic of Korea.
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Role of glutathione in cancer progression and chemoresistance. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2013; 2013:972913. [PMID: 23766865 PMCID: PMC3673338 DOI: 10.1155/2013/972913] [Citation(s) in RCA: 741] [Impact Index Per Article: 67.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Revised: 04/26/2013] [Accepted: 04/29/2013] [Indexed: 01/19/2023]
Abstract
Glutathione (GSH) plays an important role in a multitude of cellular processes, including cell differentiation, proliferation, and apoptosis, and disturbances in GSH homeostasis are involved in the etiology and progression of many human diseases including cancer. While GSH deficiency, or a decrease in the GSH/glutathione disulphide (GSSG) ratio, leads to an increased susceptibility to oxidative stress implicated in the progression of cancer, elevated GSH levels increase the antioxidant capacity and the resistance to oxidative stress as observed in many cancer cells. The present review highlights the role of GSH and related cytoprotective effects in the susceptibility to carcinogenesis and in the sensitivity of tumors to the cytotoxic effects of anticancer agents.
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Kobori T, Harada S, Nakamoto K, Tokuyama S. Time-Dependent Changes in the Activation of RhoA/ROCK and ERM/p-ERM in the Increased Expression of Intestinal P-Glycoprotein by Repeated Oral Treatment with Etoposide. J Pharm Sci 2013; 102:1670-82. [DOI: 10.1002/jps.23503] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2012] [Revised: 01/30/2013] [Accepted: 02/19/2013] [Indexed: 11/12/2022]
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Marengo B, De Ciucis CG, Ricciarelli R, Furfaro AL, Colla R, Canepa E, Traverso N, Marinari UM, Pronzato MA, Domenicotti C. p38MAPK inhibition: a new combined approach to reduce neuroblastoma resistance under etoposide treatment. Cell Death Dis 2013; 4:e589. [PMID: 23579276 PMCID: PMC3641341 DOI: 10.1038/cddis.2013.118] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Neuroblastoma (NB) is the second most common solid pediatric tumor and is characterized by clinical and biological heterogeneity, and stage-IV of the disease represents 50% of all cases. Considering the limited success of present chemotherapy treatment, it has become necessary to find new and effective therapies. In this context, our approach consists of identifying and targeting key molecular pathways associated with NB chemoresistance. This study has been carried out on three stage-IV NB cell lines with different status of MYCN amplification. Cells were exposed to a standard chemotherapy agent, namely etoposide, either alone or in combination with particular drugs, which target intracellular signaling pathways. Etoposide alone induced a concentration-dependent reduction of cell viability and, at very high doses, totally counteracted cell tumorigenicity and neurosphere formation. In addition, etoposide activated p38 mitogen-activated protein kinase (MAPK), AKT and c-Jun N-terminal kinase. Pre-treatment with SB203580, a p38MAPK inhibitor, dramatically sensibilized NB cells to etoposide, strongly reducing the dosage needed to inhibit tumorigenicity and neurosphere formation. Importantly, SB203580–etoposide cotreatment also reduced cell migration and invasion by affecting cyclooxygenase-2, intercellular adhesion molecule-1, C–X–C chemokine receptor-4 and matrix metalloprotease-9. Collectively, our results suggest that p38MAPK inhibition, in combination with standard chemotherapy, could represent an effective strategy to counteract NB resistance in stage-IV patients.
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Affiliation(s)
- B Marengo
- Department of Experimental Medicine, University of Genoa, Genoa, Italy
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do Carmo A, Balça-Silva J, Matias D, Lopes MC. PKC signaling in glioblastoma. Cancer Biol Ther 2013; 14:287-94. [PMID: 23358475 PMCID: PMC3667867 DOI: 10.4161/cbt.23615] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Revised: 01/14/2013] [Accepted: 01/15/2013] [Indexed: 01/11/2023] Open
Abstract
Glioblastoma Multiforme (GBM) is the most aggressive brain tumor characterized by intratumoral heterogeneity at cytopathological, genomic and transcriptional levels. Despite the efforts to develop new therapeutic strategies the median survival of GBM patients is 12-14 months. Results from large-scale gene expression profile studies confirmed that the genetic alterations in GBM affect pathways controlling cell cycle progression, cellular proliferation and survival and invasion ability, which may explain the difficulty to treat GBM patients. One of the signaling pathways that contribute to the aggressive behavior of glioma cells is the protein kinase C (PKC) pathway. PKC is a family of serine/threonine-specific protein kinases organized into three groups according the activating domains. Due to the variability of actions controlled by PKC isoforms, its contribution to the development of GBM is poorly understood. This review intends to highlight the contribution of PKC isoforms to proliferation, survival and invasive ability of glioma cells.
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Affiliation(s)
- Anália do Carmo
- Centre for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal.
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