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Moreno-Blas D, Gorostieta-Salas E, Castro-Obregón S. Connecting chaperone-mediated autophagy dysfunction to cellular senescence. Ageing Res Rev 2018; 41:34-41. [PMID: 29113832 DOI: 10.1016/j.arr.2017.11.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 10/26/2017] [Accepted: 11/03/2017] [Indexed: 12/20/2022]
Abstract
Chaperone-mediated autophagy (CMA) is one of the main pathways of the lysosome-autophagy proteolytic system. It regulates different cellular process through the selective degradation of cytosolic proteins. In ageing, the function of CMA is impaired causing an inefficient stress response and the accumulation of damaged, oxidized or misfolded proteins, which is associated with numerous age-related diseases. Deficient protein degradation alters cellular proteostasis and activates signaling pathways that culminate in the induction of cellular senescence, whose accumulation is a typical feature of ageing. However, the relationship between CMA activity and cellular senescence has been poorly studied. Here, we review and integrate evidence showing that CMA dysfunction correlates with the acquisition of many hallmarks of cellular senescence and propose that loss of CMA function during aging promotes cellular senescence.
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Affiliation(s)
- Daniel Moreno-Blas
- Department of Neurodevelopment and Physiology, Institute of Cellular Physiology, National Autonomous University of México (UNAM), Mexico City, Mexico.
| | - Elisa Gorostieta-Salas
- Department of Neurodevelopment and Physiology, Institute of Cellular Physiology, National Autonomous University of México (UNAM), Mexico City, Mexico.
| | - Susana Castro-Obregón
- Department of Neurodevelopment and Physiology, Institute of Cellular Physiology, National Autonomous University of México (UNAM), Mexico City, Mexico.
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52
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Saitou M, Lizardo DY, Taskent RO, Millner A, Gokcumen O, Atilla-Gokcumen GE. An evolutionary transcriptomics approach links CD36 to membrane remodeling in replicative senescence. Mol Omics 2018; 14:237-246. [DOI: 10.1039/c8mo00099a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
CD36 was identified as a core replicative senescence gene and a potential mediator of this process through membrane remodeling.
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Affiliation(s)
- Marie Saitou
- Department of Biological Sciences
- University at Buffalo
- The State University of New York
- Buffalo
- USA
| | - Darleny Y. Lizardo
- Department of Chemistry
- University at Buffalo
- The State University of New York
- Buffalo
- USA
| | - Recep Ozgur Taskent
- Department of Biological Sciences
- University at Buffalo
- The State University of New York
- Buffalo
- USA
| | - Alec Millner
- Department of Chemistry
- University at Buffalo
- The State University of New York
- Buffalo
- USA
| | - Omer Gokcumen
- Department of Biological Sciences
- University at Buffalo
- The State University of New York
- Buffalo
- USA
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53
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Li N, Sancak Y, Frasor J, Atilla-Gokcumen GE. A Protective Role for Triacylglycerols during Apoptosis. Biochemistry 2017; 57:72-80. [PMID: 29188717 DOI: 10.1021/acs.biochem.7b00975] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Triacylglycerols (TAGs) are one of the major constituents of the glycerolipid family. Their main role in cells is to store excess fatty acids, and they are mostly found within lipid droplets. TAGs contain acyl chains that vary in length and degree of unsaturation, resulting in hundreds of chemically distinct species. We have previously reported that TAGs containing polyunsaturated fatty acyl chains (PUFA-TAGs) accumulate via activation of diacylglycerol acyltransferases during apoptosis. In this work, we show that accumulation of PUFA-TAGs is a general phenomenon during this process. We further show that the accumulated PUFA-TAGs are stored in lipid droplets. Because membrane-residing PUFA phospholipids can undergo oxidation and form reactive species under increased levels of oxidative stress, we hypothesized that incorporation of PUFAs into PUFA-TAGs and their localization within lipid droplets during apoptosis limit the toxicity during this process. Indeed, exogenous delivery of a polyunsaturated fatty acid resulted in a profound accumulation of PUFA phospholipids and rendered cells more sensitive to oxidative stress, causing reduced viability. Overall, our results support the concept that activation of TAG biosynthesis protects cells from lipid peroxide-induced membrane damage under increased levels of oxidative stress during apoptosis. As such, targeting triacylglycerol biosynthesis in cancer cells might represent a new approach to promoting cell death during apoptosis.
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Affiliation(s)
- Nasi Li
- Department of Chemistry, University at Buffalo, The State University of New York (SUNY) , Buffalo, New York 14260, United States
| | - Yasemin Sancak
- Department of Pharmacology, University of Washington , Seattle, Washington 98195, United States
| | - Jonna Frasor
- Department of Physiology and Biophysics, University of Illinois at Chicago , Chicago, Illinois 60612, United States
| | - G Ekin Atilla-Gokcumen
- Department of Chemistry, University at Buffalo, The State University of New York (SUNY) , Buffalo, New York 14260, United States
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54
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Saison-Ridinger M, DelGiorno KE, Zhang T, Kraus A, French R, Jaquish D, Tsui C, Erikson G, Spike BT, Shokhirev MN, Liddle C, Yu RT, Downes M, Evans RM, Saghatelian A, Lowy AM, Wahl GM. Reprogramming pancreatic stellate cells via p53 activation: A putative target for pancreatic cancer therapy. PLoS One 2017; 12:e0189051. [PMID: 29211796 PMCID: PMC5718507 DOI: 10.1371/journal.pone.0189051] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 11/19/2017] [Indexed: 12/18/2022] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is characterized by an extremely dense fibrotic stroma, which contributes to tumor growth, metastasis, and drug resistance. During tumorigenesis, quiescent pancreatic stellate cells (PSCs) are activated and become major contributors to fibrosis, by increasing growth factor signaling and extracellular matrix deposition. The p53 tumor suppressor is known to restrict tumor initiation and progression through cell autonomous mechanisms including apoptosis, cell cycle arrest, and senescence. There is growing evidence that stromal p53 also exerts anti-tumor activity by paracrine mechanisms, though a role for stromal p53 in PDAC has not yet been described. Here, we demonstrate that activation of stromal p53 exerts anti-tumor effects in PDAC. We show that primary cancer-associated PSCs (caPSCs) isolated from human PDAC express wild-type p53, which can be activated by the Mdm2 antagonist Nutlin-3a. Our work reveals that p53 acts as a major regulator of PSC activation and as a modulator of PDAC fibrosis. In vitro, p53 activation by Nutlin-3a induces profound transcriptional changes, which reprogram activated PSCs to quiescence. Using immunofluorescence and lipidomics, we have also found that p53 activation induces lipid droplet accumulation in both normal and tumor-associated fibroblasts, revealing a previously undescribed role for p53 in lipid storage. In vivo, treatment of tumor-bearing mice with the clinical form of Nutlin-3a induces stromal p53 activation, reverses caPSCs activation, and decreases fibrosis. All together our work uncovers new functions for stromal p53 in PDAC.
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Affiliation(s)
- Maya Saison-Ridinger
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, California, United States of America
| | - Kathleen E. DelGiorno
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, California, United States of America
| | - Tejia Zhang
- Clayton Foundation Peptide Biology Lab, Helmsley Center for Genomic Medicine, Salk Institute for Biological Studies, La Jolla, California, United States of America
| | - Annabelle Kraus
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, California, United States of America
| | - Randall French
- Department of Surgery, Division of Surgical Oncology, Moores Cancer Center, University of California, San Diego, La Jolla, California, United States of America
| | - Dawn Jaquish
- Department of Surgery, Division of Surgical Oncology, Moores Cancer Center, University of California, San Diego, La Jolla, California, United States of America
| | - Crystal Tsui
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, California, United States of America
| | - Galina Erikson
- Integrative Genomics and Bioinformatics Core, Salk Institute for Biological Studies, La Jolla, California, United States of America
| | - Benjamin T. Spike
- Huntsman Cancer Institute, Department of Oncologic Sciences, University of Utah, Salt Lake City Utah, United States of America
| | - Maxim N. Shokhirev
- Integrative Genomics and Bioinformatics Core, Salk Institute for Biological Studies, La Jolla, California, United States of America
| | - Christopher Liddle
- Storr Liver Centre, Westmead Institute for Medical Research and Sydney Medical School, University of Sydney, Westmead Hospital, Westmead, New South Wales, Australia
| | - Ruth T. Yu
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, California, United States of America
| | - Michael Downes
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, California, United States of America
| | - Ronald M. Evans
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, California, United States of America
| | - Alan Saghatelian
- Clayton Foundation Peptide Biology Lab, Helmsley Center for Genomic Medicine, Salk Institute for Biological Studies, La Jolla, California, United States of America
| | - Andrew M. Lowy
- Department of Surgery, Division of Surgical Oncology, Moores Cancer Center, University of California, San Diego, La Jolla, California, United States of America
| | - Geoffrey M. Wahl
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, California, United States of America
- * E-mail:
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55
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Ademowo OS, Dias HKI, Burton DGA, Griffiths HR. Lipid (per) oxidation in mitochondria: an emerging target in the ageing process? Biogerontology 2017; 18:859-879. [PMID: 28540446 PMCID: PMC5684309 DOI: 10.1007/s10522-017-9710-z] [Citation(s) in RCA: 110] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Accepted: 05/09/2017] [Indexed: 12/11/2022]
Abstract
Lipids are essential for physiological processes such as maintaining membrane integrity, providing a source of energy and acting as signalling molecules to control processes including cell proliferation, metabolism, inflammation and apoptosis. Disruption of lipid homeostasis can promote pathological changes that contribute towards biological ageing and age-related diseases. Several age-related diseases have been associated with altered lipid metabolism and an elevation in highly damaging lipid peroxidation products; the latter has been ascribed, at least in part, to mitochondrial dysfunction and elevated ROS formation. In addition, senescent cells, which are known to contribute significantly to age-related pathologies, are also associated with impaired mitochondrial function and changes in lipid metabolism. Therapeutic targeting of dysfunctional mitochondrial and pathological lipid metabolism is an emerging strategy for alleviating their negative impact during ageing and the progression to age-related diseases. Such therapies could include the use of drugs that prevent mitochondrial uncoupling, inhibit inflammatory lipid synthesis, modulate lipid transport or storage, reduce mitochondrial oxidative stress and eliminate senescent cells from tissues. In this review, we provide an overview of lipid structure and function, with emphasis on mitochondrial lipids and their potential for therapeutic targeting during ageing and age-related disease.
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Affiliation(s)
- O S Ademowo
- Life & Health Sciences, Aston University, Birmingham, UK
| | - H K I Dias
- Life & Health Sciences, Aston University, Birmingham, UK
| | - D G A Burton
- Life & Health Sciences, Aston University, Birmingham, UK
| | - H R Griffiths
- Life & Health Sciences, Aston University, Birmingham, UK.
- Health and Medical Sciences, University of Surrey, Guildford, UK.
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56
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Lizardo DY, Parisi LR, Li N, Atilla-Gokcumen GE. Noncanonical Roles of Lipids in Different Cellular Fates. Biochemistry 2017; 57:22-29. [DOI: 10.1021/acs.biochem.7b00862] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Darleny Y. Lizardo
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Laura R. Parisi
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Nasi Li
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - G. Ekin Atilla-Gokcumen
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
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57
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Zhang H, Gao Y, Sun J, Fan S, Yao X, Ran X, Zheng C, Huang M, Bi H. Optimization of lipid extraction and analytical protocols for UHPLC-ESI-HRMS-based lipidomic analysis of adherent mammalian cancer cells. Anal Bioanal Chem 2017; 409:5349-5358. [PMID: 28717896 DOI: 10.1007/s00216-017-0483-7] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 06/10/2017] [Accepted: 06/21/2017] [Indexed: 12/12/2022]
Abstract
Lipidomics, which reveals comprehensive characterization of molecular lipids, is a rapidly growing technology used in biomedical research. Lipid extraction is a critical step in lipidomic analysis. However, the effectiveness of different lipid extract solvent systems from cellular samples still remains unclear. In the current study, the protocol of reverse-phase liquid chromatography mass spectrometry (LC/MS)-based lipidomics was optimized for extraction and detection of lipids from human pancreatic cancer cell line PANC-1. Four different extraction methods were compared, including methanol/methyl-tert-butyl ether (MTBE)/H2O, methanol/chloroform, methanol/MTBE/chloroform, and hexane/isopropanol. Data were acquired using high-resolution mass spectrometry in positive and negative ion modes respectively. The number of total detected and identified lipids was assessed with the aid of automated lipid identification software LipidSearch. Results demonstrated that methanol/MTBE/H2O provided a better extraction efficiency for different lipid classes, which was chosen as the optimized extraction solvent system. This validated method enables highly sensitive and reproducible analysis for a variety of cellular lipids, which was further applied to an untargeted lipidomic study on human pancreatic cancer PANC-1 cell lines. Moreover, this optimized extraction solvent system can be further applied to other cancer cell lines with similar chemical and physical properties. Graphical abstract Optimized UHPLC-ESI-HRMS-based lipidomic analysis of cancer cells.
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Affiliation(s)
- Huizhen Zhang
- School of Pharmaceutical Sciences, Sun Yat-sen University, 132# Waihuandong Road, Guangzhou University City, Guangzhou, 510006, China
| | - Yue Gao
- School of Pharmaceutical Sciences, Sun Yat-sen University, 132# Waihuandong Road, Guangzhou University City, Guangzhou, 510006, China
| | - Jiahong Sun
- School of Pharmaceutical Sciences, Sun Yat-sen University, 132# Waihuandong Road, Guangzhou University City, Guangzhou, 510006, China
| | - Shicheng Fan
- School of Pharmaceutical Sciences, Sun Yat-sen University, 132# Waihuandong Road, Guangzhou University City, Guangzhou, 510006, China
| | - Xinpeng Yao
- School of Pharmaceutical Sciences, Sun Yat-sen University, 132# Waihuandong Road, Guangzhou University City, Guangzhou, 510006, China
| | | | | | - Min Huang
- School of Pharmaceutical Sciences, Sun Yat-sen University, 132# Waihuandong Road, Guangzhou University City, Guangzhou, 510006, China
| | - Huichang Bi
- School of Pharmaceutical Sciences, Sun Yat-sen University, 132# Waihuandong Road, Guangzhou University City, Guangzhou, 510006, China.
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