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Obrador E, Salvador-Palmer R, López-Blanch R, Oriol-Caballo M, Moreno-Murciano P, Estrela JM. Survival Mechanisms of Metastatic Melanoma Cells: The Link between Glucocorticoids and the Nrf2-Dependent Antioxidant Defense System. Cells 2023; 12:cells12030418. [PMID: 36766760 PMCID: PMC9913432 DOI: 10.3390/cells12030418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 01/11/2023] [Accepted: 01/23/2023] [Indexed: 01/28/2023] Open
Abstract
Circulating glucocorticoids increase during stress. Chronic stress, characterized by a sustained increase in serum levels of cortisol, has been associated in different cases with an increased risk of cancer and a worse prognosis. Glucocorticoids can promote gluconeogenesis, mobilization of amino acids, fat breakdown, and impair the body's immune response. Therefore, conditions that may favor cancer growth and the acquisition of radio- and chemo-resistance. We found that glucocorticoid receptor knockdown diminishes the antioxidant protection of murine B16-F10 (highly metastatic) melanoma cells, thus leading to a drastic decrease in their survival during interaction with the vascular endothelium. The BRAFV600E mutation is the most commonly observed in melanoma patients. Recent studies revealed that VMF/PLX40-32 (vemurafenib, a selective inhibitor of mutant BRAFV600E) increases mitochondrial respiration and reactive oxygen species (ROS) production in BRAFV600E human melanoma cell lines. Early-stage cancer cells lacking Nrf2 generate high ROS levels and exhibit a senescence-like growth arrest. Thus, it is likely that a glucocorticoid receptor antagonist (RU486) could increase the efficacy of BRAF-related therapy in BRAFV600E-mutated melanoma. In fact, during early progression of skin melanoma metastases, RU486 and VMF induced metastases regression. However, treatment at an advanced stage of growth found resistance to RU486 and VMF. This resistance was mechanistically linked to overexpression of proteins of the Bcl-2 family (Bcl-xL and Mcl-1 in different human models). Moreover, melanoma resistance was decreased if AKT and NF-κB signaling pathways were blocked. These findings highlight mechanisms by which metastatic melanoma cells adapt to survive and could help in the development of most effective therapeutic strategies.
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Affiliation(s)
- Elena Obrador
- Cell Pathophysiology Unit (UFC), Department of Physiology, Faculty of Medicine and Odontology, University of Valencia, 46010 Valencia, Spain
- Scientia BioTech S.L., 46002 Valencia, Spain
- Correspondence: (E.O.); (J.M.E.); Tel.: +34-963864646 (J.M.E.)
| | - Rosario Salvador-Palmer
- Cell Pathophysiology Unit (UFC), Department of Physiology, Faculty of Medicine and Odontology, University of Valencia, 46010 Valencia, Spain
| | - Rafael López-Blanch
- Cell Pathophysiology Unit (UFC), Department of Physiology, Faculty of Medicine and Odontology, University of Valencia, 46010 Valencia, Spain
- Scientia BioTech S.L., 46002 Valencia, Spain
| | - María Oriol-Caballo
- Cell Pathophysiology Unit (UFC), Department of Physiology, Faculty of Medicine and Odontology, University of Valencia, 46010 Valencia, Spain
- Scientia BioTech S.L., 46002 Valencia, Spain
| | | | - José M. Estrela
- Cell Pathophysiology Unit (UFC), Department of Physiology, Faculty of Medicine and Odontology, University of Valencia, 46010 Valencia, Spain
- Scientia BioTech S.L., 46002 Valencia, Spain
- Department of Physiology, Faculty of Pharmacy, University of Valencia, 46100 Burjassot, Spain
- Correspondence: (E.O.); (J.M.E.); Tel.: +34-963864646 (J.M.E.)
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Friedman Y, Hizi A, Avni D, Bakhanashvili M. Mitochondrial matrix-localized p53 participates in degradation of mitochondrial RNAs. Mitochondrion 2021; 58:200-212. [PMID: 33775872 DOI: 10.1016/j.mito.2021.03.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 03/11/2021] [Accepted: 03/22/2021] [Indexed: 11/18/2022]
Abstract
Mitochondrial RNA degradation plays an important role in maintenance of the mitochondria genetic integrity. Mitochondrial localization of p53 was observed in non-stressed and stressed cells. p53, as an RNA-binding protein, exerts 3'→5' exoribonuclease activity. The data suggest that in non-stressed cells, mitochondrial matrix-localized p53, with exoribonuclease activity, may play a housekeeping positive role. p53, through restriction the formation of new RNA/DNA hybrid and processing R-loop, might serve as mitochondrial R-loop suppressor. Conversely, stress-induced matrix-p53 decreases the amount of mitochondrial single-stranded RNA transcripts (including polyA- and non-polyA RNAs), thereby leading to the decline in the amount of mitochondria-encoded oxidative phosphorylation components.
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Affiliation(s)
- Yael Friedman
- Infectious Diseases Unit, Sheba Medical Center, Tel-Hashomer 5265601, Israel
| | - Amnon Hizi
- Department of Cellular and Developmental Biology, Sackler School of Medicine, Tel-Aviv University, Tel Aviv, Israel
| | - Dror Avni
- Lab. Mol. Cell Biology, Center for Cancer Research & Dep. of Medicine C, Sheba Medical Center, Tel Hashomer, Israel
| | - Mary Bakhanashvili
- Infectious Diseases Unit, Sheba Medical Center, Tel-Hashomer 5265601, Israel; The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel.
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Derech-Haim S, Friedman Y, Hizi A, Bakhanashvili M. p53 regulates its own expression by an intrinsic exoribonuclease activity through AU-rich elements. J Mol Med (Berl) 2020; 98:437-449. [PMID: 32016559 DOI: 10.1007/s00109-020-01884-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 12/26/2019] [Accepted: 01/28/2020] [Indexed: 11/25/2022]
Abstract
The onco-suppressor p53 protein plays also an important role in the control of various aspects of health and disease. p53 levels are low in normal cells and elevated under stress conditions. While low levels of p53 promote tumor formation, overactive p53 leads to premature aging and cell death. RNA degradation is a critical level of regulation contributing to the control of gene expression. p53, as an RNA-binding protein, exerts 3' → 5' exoribonuclease activity, mediating degradation of adenylate/uridylate-rich elements (ARE)-containing ssRNAs. The 3'-UTR of p53-mRNA, which is a target of p53 itself, harbors cis-acting AREs. Our results suggest that p53 controls its own expression through murine double-minute 2 (mdm2)-independent "RNA decay" function in cytoplasm. We demonstrate that p53 expresses an exoribonuclease activity through the binding to ARE sequences of p53-mRNA via translation-independent and translation-dependent polysome-associated pathways. Antagonistic interplay was detected between p53 levels and execution of its exoribonuclease function mirrored in low p53 levels in normal cells, due to the efficient exoribonuclease activity, and in the accumulation of p53 in cells exposed to p53-activating drugs in accordance with the reduced exoribonuclease activity. Apparently, p53, via control of its own mRNA stability and/or translation in cytoplasm, might act as a negative regulator of p53-mRNA levels. The observed connection between exoribonuclease activity and p53 abundance highlights the importance of this function affecting p53 expression, imperative for multiple functions, with implications for the steady-state levels of protein and for the p53 stress response. The modulation in expression of exoribonuclease activity would be translated into the alterations in p53 level. KEY MESSAGES: p53 controls its own expression through mdm2-independent "RNA decay" function in cytoplasm. p53 expresses an exoribonuclease activity through the binding to ARE sequences of p53-mRNA. Antagonistic interplay exists between stress-induced p53 and execution of its exoribonuclease function.
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Affiliation(s)
- Sanaz Derech-Haim
- Infectious Diseases Unit, Sheba Medical Center, 5265601, Tel-Hashomer, Israel
| | - Yael Friedman
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, 5290002, Ramat-Gan, Israel
| | - Amnon Hizi
- Department of Cellular and Developmental Biology, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Mary Bakhanashvili
- Infectious Diseases Unit, Sheba Medical Center, 5265601, Tel-Hashomer, Israel.
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, 5290002, Ramat-Gan, Israel.
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Marcel V, Nguyen Van Long F, Diaz JJ. 40 Years of Research Put p53 in Translation. Cancers (Basel) 2018; 10:E152. [PMID: 29883412 PMCID: PMC5977125 DOI: 10.3390/cancers10050152] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 05/15/2018] [Accepted: 05/18/2018] [Indexed: 12/18/2022] Open
Abstract
Since its discovery in 1979, p53 has shown multiple facets. Initially the tumor suppressor p53 protein was considered as a stress sensor able to maintain the genome integrity by regulating transcription of genes involved in cell cycle arrest, apoptosis and DNA repair. However, it rapidly came into light that p53 regulates gene expression to control a wider range of biological processes allowing rapid cell adaptation to environmental context. Among them, those related to cancer have been extensively documented. In addition to its role as transcription factor, scattered studies reported that p53 regulates miRNA processing, modulates protein activity by direct interaction or exhibits RNA-binding activity, thus suggesting a role of p53 in regulating several layers of gene expression not restricted to transcription. After 40 years of research, it appears more and more clearly that p53 is strongly implicated in translational regulation as well as in the control of the production and activity of the translational machinery. Translation control of specific mRNAs could provide yet unsuspected capabilities to this well-known guardian of the genome.
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Affiliation(s)
- Virginie Marcel
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM 1052, CNRS 5286, Centre Léon Bérard, Centre de Recherche en Cancérologie de Lyon, 69008 Lyon, France.
| | - Flora Nguyen Van Long
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM 1052, CNRS 5286, Centre Léon Bérard, Centre de Recherche en Cancérologie de Lyon, 69008 Lyon, France.
| | - Jean-Jacques Diaz
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM 1052, CNRS 5286, Centre Léon Bérard, Centre de Recherche en Cancérologie de Lyon, 69008 Lyon, France.
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Miyahara H, Itonaga T, Maeda T, Izumi T, Ihara K. Overexpression of p53 but not Rb in the cytoplasm of neurons and small vessels in an autopsy of a patient with Cockayne syndrome. Neuropathology 2014; 35:266-72. [DOI: 10.1111/neup.12183] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2014] [Revised: 10/20/2014] [Accepted: 10/21/2014] [Indexed: 12/17/2022]
Affiliation(s)
- Hiroaki Miyahara
- Department of Pediatrics; Oita University Faculty of Medicine; Oita Japan
| | - Tomoyo Itonaga
- Department of Pediatrics; Oita University Faculty of Medicine; Oita Japan
| | - Tomoki Maeda
- Department of Pediatrics; Oita University Faculty of Medicine; Oita Japan
| | - Tatsuro Izumi
- Department of Pediatrics; Oita University Faculty of Medicine; Oita Japan
| | - Kenji Ihara
- Department of Pediatrics; Oita University Faculty of Medicine; Oita Japan
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