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Knopf P, Pacheco-Torres J, Zizmare L, Mori N, Wildes F, Zhou B, Krishnamachary B, Mironchik Y, Kneilling M, Trautwein C, Pichler BJ, Bhujwalla ZM. Metabolic fingerprinting by nuclear magnetic resonance of hepatocellular carcinoma cells during p53 reactivation-induced senescence. NMR IN BIOMEDICINE 2024; 37:e5157. [PMID: 38589764 DOI: 10.1002/nbm.5157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Revised: 03/06/2024] [Accepted: 03/06/2024] [Indexed: 04/10/2024]
Abstract
Cellular senescence is characterized by stable cell cycle arrest. Senescent cells exhibit a senescence-associated secretory phenotype that can promote tumor progression. The aim of our study was to identify specific nuclear magnetic resonance (NMR) spectroscopy-based markers of cancer cell senescence. For metabolic studies, we employed murine liver carcinoma Harvey Rat Sarcoma Virus (H-Ras) cells, in which reactivation of p53 expression induces senescence. Senescent and nonsenescent cell extracts were subjected to high-resolution proton (1H)-NMR spectroscopy-based metabolomics, and dynamic metabolic changes during senescence were analyzed using a magnetic resonance spectroscopy (MRS)-compatible cell perfusion system. Additionally, the ability of intact senescent cells to degrade the extracellular matrix (ECM) was quantified in the cell perfusion system. Analysis of senescent H-Ras cell extracts revealed elevated sn-glycero-3-phosphocholine, myoinositol, taurine, and creatine levels, with decreases in glycine, o-phosphocholine, threonine, and valine. These metabolic findings were accompanied by a greater degradation index of the ECM in senescent H-Ras cells than in control H-Ras cells. MRS studies with the cell perfusion system revealed elevated creatine levels in senescent cells on Day 4, confirming the 1H-NMR results. These senescence-associated changes in metabolism and ECM degradation strongly impact growth and redox metabolism and reveal potential MRS signals for detecting senescent cancer cells in vivo.
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Affiliation(s)
- Philipp Knopf
- Werner Siemens Imaging Center, Department of Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Tübingen, Germany
- Division of Cancer Imaging Research, The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, School of Medicine, Baltimore, Maryland, USA
| | - Jesus Pacheco-Torres
- Division of Cancer Imaging Research, The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, School of Medicine, Baltimore, Maryland, USA
| | - Laimdota Zizmare
- Werner Siemens Imaging Center, Department of Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Tübingen, Germany
- Cluster of Excellence iFIT (EXC2180) "Image-Guided and Functionally Instructed Tumor Therapies", University of Tübingen, Tübingen, Germany
| | - Noriko Mori
- Division of Cancer Imaging Research, The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, School of Medicine, Baltimore, Maryland, USA
| | - Flonne Wildes
- Division of Cancer Imaging Research, The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, School of Medicine, Baltimore, Maryland, USA
| | - Benyuan Zhou
- Werner Siemens Imaging Center, Department of Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Tübingen, Germany
| | - Balaji Krishnamachary
- Division of Cancer Imaging Research, The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, School of Medicine, Baltimore, Maryland, USA
| | - Yelena Mironchik
- Division of Cancer Imaging Research, The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, School of Medicine, Baltimore, Maryland, USA
| | - Manfred Kneilling
- Werner Siemens Imaging Center, Department of Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Tübingen, Germany
- Cluster of Excellence iFIT (EXC2180) "Image-Guided and Functionally Instructed Tumor Therapies", University of Tübingen, Tübingen, Germany
- Department of Dermatology, Eberhard Karls University Tübingen, Tübingen, Germany
| | - Christoph Trautwein
- Werner Siemens Imaging Center, Department of Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Tübingen, Germany
- Cluster of Excellence iFIT (EXC2180) "Image-Guided and Functionally Instructed Tumor Therapies", University of Tübingen, Tübingen, Germany
| | - Bernd J Pichler
- Werner Siemens Imaging Center, Department of Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Tübingen, Germany
- Cluster of Excellence iFIT (EXC2180) "Image-Guided and Functionally Instructed Tumor Therapies", University of Tübingen, Tübingen, Germany
- German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ) partner site Tübingen, Tübingen, Germany
| | - Zaver M Bhujwalla
- Division of Cancer Imaging Research, The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, School of Medicine, Baltimore, Maryland, USA
- Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University, School of Medicine, Baltimore, Maryland, USA
- Department of Radiation Oncology and Molecular Radiation Sciences, The Johns Hopkins University, School of Medicine, Baltimore, Maryland, USA
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2
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Moustafa TE, Belote RL, Polanco ER, Judson-Torres RL, Zangle TA. Quadrant darkfield (QDF) for label-free imaging of intracellular puncta. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.08.05.606686. [PMID: 39149239 PMCID: PMC11326191 DOI: 10.1101/2024.08.05.606686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/17/2024]
Abstract
Significance Measuring changes in cellular structure and organelles is crucial for understanding disease progression and cellular responses to treatments. A label-free imaging method can aid in advancing biomedical research and therapeutic strategies. Aim This study introduces a computational darkfield imaging approach named quadrant darkfield (QDF) to separate smaller cellular features from large structures, enabling label-free imaging of cell organelles and structures in living cells. Approach Using a programmable LED array as illumination source, we vary the direction of illumination to encode additional information about the feature size within cells. This is possible due to the varying level of directional scattering produced by features based on their sizes relative to the wavelength of light used. Results QDF successfully resolved small cellular features without interference from larger structures. QDF signal is more consistent during cell shape changes than traditional darkfield. QDF signals correlate with flow cytometry side scatter measurements, effectively differentiating cells by organelle content. Conclusions QDF imaging enhances the study of subcellular structures in living cells, offering improved quantification of organelle content compared to darkfield without labels. This method can be simultaneously performed with other techniques such as quantitative phase imaging to generate a multidimensional picture of living cells in real-time.
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Affiliation(s)
- Tarek E Moustafa
- University of Utah, Department of Chemical Engineering, Salt Lake City, Utah, United States
| | - Rachel L Belote
- University of Utah, Huntsman Cancer Institute, Salt Lake City, Utah, United States
- The Ohio State University, Department of Molecular Genetics, Columbus, Ohio, United States
| | - Edward R Polanco
- University of Utah, Department of Chemical Engineering, Salt Lake City, Utah, United States
| | - Robert L Judson-Torres
- University of Utah, Huntsman Cancer Institute, Salt Lake City, Utah, United States
- University of Utah, Department of Dermatology, Salt Lake City, Utah, United States
- University of Utah, Department of Oncological Sciences, Salt Lake City, Utah, United States
| | - Thomas A Zangle
- University of Utah, Department of Chemical Engineering, Salt Lake City, Utah, United States
- University of Utah, Huntsman Cancer Institute, Salt Lake City, Utah, United States
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3
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Wu J, Wang C, Sun S, Ren T, Pan L, Liu H, Hou S, Wu S, Yan X, Zhang J, Zhao X, Liu W, Zhu S, Wei S, Zhang C, Jia X, Zhang Q, Yu Z, Zhuo Y, Zhao Q, Yang C, Wang N. Single-cell transcriptomic Atlas of aging macaque ocular outflow tissues. Protein Cell 2024; 15:594-611. [PMID: 38366188 PMCID: PMC11259549 DOI: 10.1093/procel/pwad067] [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: 07/24/2023] [Accepted: 11/24/2023] [Indexed: 02/18/2024] Open
Abstract
The progressive degradation in the trabecular meshwork (TM) is related to age-related ocular diseases like primary open-angle glaucoma. However, the molecular basis and biological significance of the aging process in TM have not been fully elucidated. Here, we established a dynamic single-cell transcriptomic landscape of aged macaque TM, wherein we classified the outflow tissue into 12 cell subtypes and identified mitochondrial dysfunction as a prominent feature of TM aging. Furthermore, we divided TM cells into 13 clusters and performed an in-depth analysis on cluster 0, which had the highest aging score and the most significant changes in cell proportions between the two groups. Ultimately, we found that the APOE gene was an important differentially expressed gene in cluster 0 during the aging process, highlighting the close relationship between cell migration and extracellular matrix regulation, and TM function. Our work further demonstrated that silencing the APOE gene could increase migration and reduce apoptosis by releasing the inhibition on the PI3K-AKT pathway and downregulating the expression of extracellular matrix components, thereby increasing the aqueous outflow rate and maintaining intraocular pressure within the normal range. Our work provides valuable insights for future clinical diagnosis and treatment of glaucoma.
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Affiliation(s)
- Jian Wu
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou 510060, China
| | - Chaoye Wang
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou 510060, China
| | - Shuhui Sun
- State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
- Beijing Institute for Stem Cell and Regenerative Medicine, Beijing 100101, China
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing 100101, China
| | - Tianmin Ren
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
| | - Lijie Pan
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
| | - Hongyi Liu
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
| | - Simeng Hou
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
| | - Shen Wu
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
| | - Xuejing Yan
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
| | - Jingxue Zhang
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
| | - Xiaofang Zhao
- Department of Neurosurgery, Peking University Third Hospital, Center for Precision Neurosurgery and Oncology of Peking University Health Science Center, Beijing 100191, China
| | - Weihai Liu
- Department of Neurosurgery, Peking University Third Hospital, Center for Precision Neurosurgery and Oncology of Peking University Health Science Center, Beijing 100191, China
| | - Sirui Zhu
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
| | - Shuwen Wei
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
| | - Chi Zhang
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
| | - Xu Jia
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou 510060, China
| | - Qi Zhang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou 510060, China
| | - Ziyu Yu
- Spencer Center for Vision Research, Byers Eye Institute, School of Medicine, Stanford University, Palo Alto, CA 94304, USA
| | - Yehong Zhuo
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou 510060, China
| | - Qi Zhao
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou 510060, China
| | - Chenlong Yang
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing 100101, China
- Department of Neurosurgery, Peking University Third Hospital, Center for Precision Neurosurgery and Oncology of Peking University Health Science Center, Beijing 100191, China
| | - Ningli Wang
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
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4
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Manohar SM. Shedding Light on Intracellular Proteins using Flow Cytometry. Cell Biochem Biophys 2024:10.1007/s12013-024-01338-1. [PMID: 38831173 DOI: 10.1007/s12013-024-01338-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/24/2024] [Indexed: 06/05/2024]
Abstract
Intracellular protein abundance is routinely measured in mammalian cells using population-based techniques such as western blotting which fail to capture single cell protein levels or using fluorescence microscopy which is although suitable for single cell protein detection but not for rapid analysis of large no. of cells. Flow cytometry offers rapid, high-throughput, multiparameter-based analysis of intracellular protein expression in statistically significant no. of cells at single cell resolution. In past few decades, customized assays have been developed for flow cytometric detection of specific intracellular proteins. This review discusses the scope of flow cytometry for intracellular protein detection in mammalian cells along with specific applications. Technological advancements to overcome the limitations of traditional flow cytometry for the same are also discussed.
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Affiliation(s)
- Sonal M Manohar
- Department of Biological Sciences, Sunandan Divatia School of Science, SVKM's NMIMS (Deemed-to-be) University, Vile Parle (West), Mumbai, 400056, India.
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5
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Chauvin SD, Ando S, Holley JA, Sugie A, Zhao FR, Poddar S, Kato R, Miner CA, Nitta Y, Krishnamurthy SR, Saito R, Ning Y, Hatano Y, Kitahara S, Koide S, Stinson WA, Fu J, Surve N, Kumble L, Qian W, Polishchuk O, Andhey PS, Chiang C, Liu G, Colombeau L, Rodriguez R, Manel N, Kakita A, Artyomov MN, Schultz DC, Coates PT, Roberson EDO, Belkaid Y, Greenberg RA, Cherry S, Gack MU, Hardy T, Onodera O, Kato T, Miner JJ. Inherited C-terminal TREX1 variants disrupt homology-directed repair to cause senescence and DNA damage phenotypes in Drosophila, mice, and humans. Nat Commun 2024; 15:4696. [PMID: 38824133 PMCID: PMC11144269 DOI: 10.1038/s41467-024-49066-7] [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: 11/03/2023] [Accepted: 05/22/2024] [Indexed: 06/03/2024] Open
Abstract
Age-related microangiopathy, also known as small vessel disease (SVD), causes damage to the brain, retina, liver, and kidney. Based on the DNA damage theory of aging, we reasoned that genomic instability may underlie an SVD caused by dominant C-terminal variants in TREX1, the most abundant 3'-5' DNA exonuclease in mammals. C-terminal TREX1 variants cause an adult-onset SVD known as retinal vasculopathy with cerebral leukoencephalopathy (RVCL or RVCL-S). In RVCL, an aberrant, C-terminally truncated TREX1 mislocalizes to the nucleus due to deletion of its ER-anchoring domain. Since RVCL pathology mimics that of radiation injury, we reasoned that nuclear TREX1 would cause DNA damage. Here, we show that RVCL-associated TREX1 variants trigger DNA damage in humans, mice, and Drosophila, and that cells expressing RVCL mutant TREX1 are more vulnerable to DNA damage induced by chemotherapy and cytokines that up-regulate TREX1, leading to depletion of TREX1-high cells in RVCL mice. RVCL-associated TREX1 mutants inhibit homology-directed repair (HDR), causing DNA deletions and vulnerablility to PARP inhibitors. In women with RVCL, we observe early-onset breast cancer, similar to patients with BRCA1/2 variants. Our results provide a mechanistic basis linking aberrant TREX1 activity to the DNA damage theory of aging, premature senescence, and microvascular disease.
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Affiliation(s)
- Samuel D Chauvin
- Division of Rheumatology, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
- RVCL Research Center, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Shoichiro Ando
- Department of Neurology, Clinical Neuroscience Branch, Brain Research Institute, Niigata University, Niigata, Japan
| | - Joe A Holley
- Division of Rheumatology, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
- RVCL Research Center, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Atsushi Sugie
- Department of Neuroscience of Disease, Brain Research Institute, Niigata University, Niigata, Japan
| | - Fang R Zhao
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, USA
| | - Subhajit Poddar
- Division of Rheumatology, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
- RVCL Research Center, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Rei Kato
- Department of Neurology, Clinical Neuroscience Branch, Brain Research Institute, Niigata University, Niigata, Japan
| | - Cathrine A Miner
- Division of Rheumatology, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
- RVCL Research Center, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Yohei Nitta
- Department of Neuroscience of Disease, Brain Research Institute, Niigata University, Niigata, Japan
| | - Siddharth R Krishnamurthy
- Metaorganism Immunity Section, Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
- NIAID Microbiome Program, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Rie Saito
- Department of Pathology, Clinical Neuroscience Branch, Brain Research Institute, Niigata University, Niigata, Japan
| | - Yue Ning
- Division of Rheumatology, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
- RVCL Research Center, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Yuya Hatano
- Department of Neurology, Clinical Neuroscience Branch, Brain Research Institute, Niigata University, Niigata, Japan
| | - Sho Kitahara
- Department of Neurology, Clinical Neuroscience Branch, Brain Research Institute, Niigata University, Niigata, Japan
| | - Shin Koide
- Department of Neurology, Clinical Neuroscience Branch, Brain Research Institute, Niigata University, Niigata, Japan
| | - W Alexander Stinson
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, USA
| | - Jiayuan Fu
- Division of Rheumatology, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
- RVCL Research Center, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Nehalee Surve
- Division of Rheumatology, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
- RVCL Research Center, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Lindsay Kumble
- Division of Rheumatology, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
- RVCL Research Center, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Wei Qian
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, USA
| | - Oleksiy Polishchuk
- Division of Rheumatology, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
- RVCL Research Center, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Prabhakar S Andhey
- Department of Pathology and Immunology, Washington University in Saint Louis, Saint Louis, MO, USA
| | - Cindy Chiang
- Department of Microbiology, The University of Chicago, Chicago, IL, USA
- Florida Research and Innovation Center, Cleveland Clinic, Port Saint Lucie, FL, USA
| | - Guanqun Liu
- Department of Microbiology, The University of Chicago, Chicago, IL, USA
- Florida Research and Innovation Center, Cleveland Clinic, Port Saint Lucie, FL, USA
| | - Ludovic Colombeau
- Equipe Labellisée Ligue Contre le Cancer, Institut Curie, CNRS, INSERM, PSL Research University, Paris, France
| | - Raphaël Rodriguez
- Equipe Labellisée Ligue Contre le Cancer, Institut Curie, CNRS, INSERM, PSL Research University, Paris, France
| | - Nicolas Manel
- INSERM U932, Institut Curie, PSL Research University, Paris, France
| | - Akiyoshi Kakita
- Department of Pathology, Clinical Neuroscience Branch, Brain Research Institute, Niigata University, Niigata, Japan
| | - Maxim N Artyomov
- Department of Pathology and Immunology, Washington University in Saint Louis, Saint Louis, MO, USA
| | - David C Schultz
- High-throughput Screening Core, University of Pennsylvania, Philadelphia, PA, USA
| | - P Toby Coates
- Central and Northern Adelaide Renal and Transplantation Service (CNARTS), The Royal Adelaide Hospital, Adelaide, South Australia, Australia
- School of Medicine, Faculty of Health Sciences, University of Adelaide, Adelaide, South Australia, Australia
| | - Elisha D O Roberson
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, USA
| | - Yasmine Belkaid
- Metaorganism Immunity Section, Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
- NIAID Microbiome Program, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
- Institut Pasteur, Paris, France
| | - Roger A Greenberg
- Department of Cancer Biology, Penn Center for Genome Integrity, Basser Center for BRCA, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Sara Cherry
- Institute for Immunology and Immune Health, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
- Department of Pathology and Laboratory Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Michaela U Gack
- Department of Microbiology, The University of Chicago, Chicago, IL, USA
- Florida Research and Innovation Center, Cleveland Clinic, Port Saint Lucie, FL, USA
| | - Tristan Hardy
- Genetics, Repromed, Monash IVF, Dulwich, South Australia, Australia
- Genetics and Molecular Pathology, SA Pathology, Adelaide, Australia
| | - Osamu Onodera
- Department of Neurology, Clinical Neuroscience Branch, Brain Research Institute, Niigata University, Niigata, Japan
- Department of Molecular Neuroscience, Brain Science Branch, Brain Research Institute, Niigata University, Niigata, Japan
| | - Taisuke Kato
- Department of Molecular Neuroscience, Brain Science Branch, Brain Research Institute, Niigata University, Niigata, Japan.
| | - Jonathan J Miner
- Division of Rheumatology, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA.
- RVCL Research Center, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA.
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, USA.
- Institute for Immunology and Immune Health, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA.
- Department of Microbiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA.
- Penn Colton Center for Autoimmunity, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA.
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6
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Welter EM, Benavides S, Archer TK, Kosyk O, Zannas AS. Machine learning-based morphological quantification of replicative senescence in human fibroblasts. GeroScience 2024; 46:2425-2439. [PMID: 37985642 PMCID: PMC10828145 DOI: 10.1007/s11357-023-01007-w] [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: 04/27/2023] [Accepted: 10/28/2023] [Indexed: 11/22/2023] Open
Abstract
Although aging has been investigated extensively at the organismal and cellular level, the morphological changes that individual cells undergo along their replicative lifespan have not been precisely quantified. Here, we present the results of a readily accessible machine learning-based pipeline that uses standard fluorescence microscope and open access software to quantify the minute morphological changes that human fibroblasts undergo during their replicative lifespan in culture. Applying this pipeline in a widely used fibroblast cell line (IMR-90), we find that advanced replicative age robustly increases (+28-79%) cell surface area, perimeter, number and total length of pseudopodia, and nuclear surface area, while decreasing cell circularity, with phenotypic changes largely occurring as replicative senescence is reached. These senescence-related morphological changes are recapitulated, albeit to a variable extent, in primary dermal fibroblasts derived from human donors of different ancestry, age, and sex groups. By performing integrative analysis of single-cell morphology, our pipeline further classifies senescent-like cells and quantifies how their numbers increase with replicative senescence in IMR-90 cells and in dermal fibroblasts across all tested donors. These findings provide quantitative insights into replicative senescence, while demonstrating applicability of a readily accessible computational pipeline for high-throughput cell phenotyping in aging research.
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Affiliation(s)
- Emma M Welter
- Department of Psychiatry, University of North Carolina at Chapel Hill, 438 Taylor Hall, 109 Mason Farm Road, Chapel Hill, NC, 27599, USA
| | - Sofia Benavides
- Department of Psychiatry, University of North Carolina at Chapel Hill, 438 Taylor Hall, 109 Mason Farm Road, Chapel Hill, NC, 27599, USA
| | - Trevor K Archer
- Chromatin and Gene Expression Section, Epigenetics and Stem Cell Biology Laboratory, National Institute of Environmental Health Sciences, Durham, NC, 27709, USA
| | - Oksana Kosyk
- Department of Psychiatry, University of North Carolina at Chapel Hill, 438 Taylor Hall, 109 Mason Farm Road, Chapel Hill, NC, 27599, USA
| | - Anthony S Zannas
- Department of Psychiatry, University of North Carolina at Chapel Hill, 438 Taylor Hall, 109 Mason Farm Road, Chapel Hill, NC, 27599, USA.
- Department of Genetics, University of North Carolina at Chapel Hill, 438 Taylor Hall, 109 Mason Farm Road, Chapel Hill, NC, 27599, USA.
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7
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Woronzow V, Möhner J, Remane D, Zischler H. Generation of somatic de novo structural variation as a hallmark of cellular senescence in human lung fibroblasts. Front Cell Dev Biol 2023; 11:1274807. [PMID: 38152346 PMCID: PMC10751365 DOI: 10.3389/fcell.2023.1274807] [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: 08/08/2023] [Accepted: 11/29/2023] [Indexed: 12/29/2023] Open
Abstract
Cellular senescence is characterized by replication arrest in response to stress stimuli. Senescent cells accumulate in aging tissues and can trigger organ-specific and possibly systemic dysfunction. Although senescent cell populations are heterogeneous, a key feature is that they exhibit epigenetic changes. Epigenetic changes such as loss of repressive constitutive heterochromatin could lead to subsequent LINE-1 derepression, a phenomenon often described in the context of senescence or somatic evolution. LINE-1 elements decode the retroposition machinery and reverse transcription generates cDNA from autonomous and non-autonomous TEs that can potentially reintegrate into genomes and cause structural variants. Another feature of cellular senescence is mitochondrial dysfunction caused by mitochondrial damage. In combination with impaired mitophagy, which is characteristic of senescent cells, this could lead to cytosolic mtDNA accumulation and, as a genomic consequence, integrations of mtDNA into nuclear DNA (nDNA), resulting in mitochondrial pseudogenes called numts. Thus, both phenomena could cause structural variants in aging genomes that go beyond epigenetic changes. We therefore compared proliferating and senescent IMR-90 cells in terms of somatic de novo numts and integrations of a non-autonomous composite retrotransposons - the so-called SVA elements-that hijack the retropositional machinery of LINE-1. We applied a subtractive and kinetic enrichment technique using proliferating cell DNA as a driver and senescent genomes as a tester for the detection of nuclear flanks of de novo SVA integrations. Coupled with deep sequencing we obtained a genomic readout for SVA retrotransposition possibly linked to cellular senescence in the IMR-90 model. Furthermore, we compared the genomes of proliferative and senescent IMR-90 cells by deep sequencing or after enrichment of nuclear DNA using AluScan technology. A total of 1,695 de novo SVA integrations were detected in senescent IMR-90 cells, of which 333 were unique. Moreover, we identified a total of 81 de novo numts with perfect identity to both mtDNA and nuclear hg38 flanks. In summary, we present evidence for possible age-dependent structural genomic changes by paralogization that go beyond epigenetic modifications. We hypothesize, that the structural variants we observe potentially impact processes associated with replicative aging of IMR-90 cells.
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Affiliation(s)
- Valentina Woronzow
- Division of Anthropology, Institute of Organismic and Molecular Evolution, Faculty of Biology, Johannes Gutenberg University Mainz, Mainz, Germany
| | - Jonas Möhner
- Division of Anthropology, Institute of Organismic and Molecular Evolution, Faculty of Biology, Johannes Gutenberg University Mainz, Mainz, Germany
| | - Daniel Remane
- Division of Anthropology, Institute of Organismic and Molecular Evolution, Faculty of Biology, Johannes Gutenberg University Mainz, Mainz, Germany
- HOX Life Science GmbH, Frankfurt, Hessen, Germany
| | - Hans Zischler
- Division of Anthropology, Institute of Organismic and Molecular Evolution, Faculty of Biology, Johannes Gutenberg University Mainz, Mainz, Germany
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8
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Zhao W, Shen B, Cheng Q, Zhou Y, Chen K. Roles of TSP1-CD47 signaling pathway in senescence of endothelial cells: cell cycle, inflammation and metabolism. Mol Biol Rep 2023; 50:4579-4585. [PMID: 36897523 DOI: 10.1007/s11033-023-08357-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 02/23/2023] [Indexed: 03/11/2023]
Abstract
Endothelial cells (ECs) serve as a barrier with forming a monolayer lining in the surface of vascular system. Many mature cell types are post-mitotic like neurons, but ECs have the ability to grow during angiogenesis. Vascular endothelial growth factor (VEGF) stimulates growth of vascular ECs derived from arteries, veins, and lymphatics and induces angiogenesis. Senescence of ECs is regarded as a key contributor in aging-induced vascular dysfunction via evoking increase of ECs permeability, impairment of angiogenesis and vascular repair. Several genomics and proteomics studies on ECs senescence reported changes in gene and protein expression that directly correlate with vascular systemic disorder. CD47 functions as a signaling receptor for secreted matricellular protein thrombospondin-1 (TSP1) and plays an important role in several fundamental cellular functions, including proliferation, apoptosis, inflammation, and atherosclerotic response. TSP1-CD47 signaling is upregulated with age in ECs, concurrent with suppression of key self-renewal genes. Recent studies indicate that CD47 is involved in regulation of senescence, self-renewal and inflammation. In this review, we highlight the functions of CD47 in senescent ECs, including modulation of cell cycle, mediation of inflammation and metabolism by the experimental studies, which may provide CD47 as a potential therapeutic target for aging-associated vascular dysfunction.
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Affiliation(s)
- Wei Zhao
- Department of Cardiology, The First Hospital of Jilin University, Changchun, China
| | - Botao Shen
- Department of Cardiology, The First Hospital of Jilin University, Changchun, China
| | - Quanli Cheng
- Department of Cardiology, The First Hospital of Jilin University, Changchun, China
| | - Yangyang Zhou
- Department of Neurology, The First Hospital of Jilin University, Changchun, China.
| | - Kexin Chen
- Institute of Translational Medicine, The First Hospital of Jilin University, Changchun, China.
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9
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Ligasová A, Frydrych I, Koberna K. Basic Methods of Cell Cycle Analysis. Int J Mol Sci 2023; 24:ijms24043674. [PMID: 36835083 PMCID: PMC9963451 DOI: 10.3390/ijms24043674] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 02/07/2023] [Accepted: 02/08/2023] [Indexed: 02/16/2023] Open
Abstract
Cellular growth and the preparation of cells for division between two successive cell divisions is called the cell cycle. The cell cycle is divided into several phases; the length of these particular cell cycle phases is an important characteristic of cell life. The progression of cells through these phases is a highly orchestrated process governed by endogenous and exogenous factors. For the elucidation of the role of these factors, including pathological aspects, various methods have been developed. Among these methods, those focused on the analysis of the duration of distinct cell cycle phases play important role. The main aim of this review is to guide the readers through the basic methods of the determination of cell cycle phases and estimation of their length, with a focus on the effectiveness and reproducibility of the described methods.
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10
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Zhang N, Shang M, Li H, Wu L, Dong M, Huang B, Lu J, Zhang Y. Dual Inhibition of H3K9me2 and H3K27me3 Promotes Tumor Cell Senescence without Triggering the Secretion of SASP. Int J Mol Sci 2022; 23:ijms23073911. [PMID: 35409271 PMCID: PMC8999616 DOI: 10.3390/ijms23073911] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 03/26/2022] [Accepted: 03/28/2022] [Indexed: 01/10/2023] Open
Abstract
Chemotherapy remains the most common cancer treatment. Although chemotherapeutic drugs induce tumor cell senescence, they are often associated with post-therapy tumor recurrence by inducing the senescence-associated secretory phenotype (SASP). Therefore, it is important to identify effective strategies to induce tumor cell senescence without triggering SASP. In this study, we used the small molecule inhibitors, UNC0642 (G9a inhibitor) and UNC1999 (EZH2 inhibitor) alone or in combination, to inhibit H3K9 and H3K27 methylation in different cancer cells. Dual inhibition of H3K9me2 and H3K27me3 in highly metastatic tumor cells had a stronger pro-senescence effect than either inhibitor alone and did not trigger SASP in tumor cells. Dual inhibition of H3K9me2 and H3K27me3 suppressed the formation of cytosolic chromatin fragments, which inhibited the cGAS-STING-SASP pathway. Collectively, these data suggested that dual inhibition of H3K9 and H3K27 methylation induced senescence of highly metastatic tumor cells without triggering SASP by inhibiting the cGAS-STING-SASP pathway, providing a new mechanism for the epigenetics-based therapy targeting H3K9 and H3K27 methylation.
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Affiliation(s)
- Na Zhang
- The Key Laboratory of Molecular Epigenetics of Ministry of Education (MOE), Northeast Normal University, Changchun 130024, China; (N.Z.); (H.L.); (M.D.); (B.H.)
| | - Mengjie Shang
- The Institute of Genetics and Cytology, Northeast Normal University, Changchun 130024, China; (M.S.); (L.W.); (J.L.)
| | - Hongxin Li
- The Key Laboratory of Molecular Epigenetics of Ministry of Education (MOE), Northeast Normal University, Changchun 130024, China; (N.Z.); (H.L.); (M.D.); (B.H.)
| | - Lan Wu
- The Institute of Genetics and Cytology, Northeast Normal University, Changchun 130024, China; (M.S.); (L.W.); (J.L.)
| | - Meichen Dong
- The Key Laboratory of Molecular Epigenetics of Ministry of Education (MOE), Northeast Normal University, Changchun 130024, China; (N.Z.); (H.L.); (M.D.); (B.H.)
| | - Baiqu Huang
- The Key Laboratory of Molecular Epigenetics of Ministry of Education (MOE), Northeast Normal University, Changchun 130024, China; (N.Z.); (H.L.); (M.D.); (B.H.)
| | - Jun Lu
- The Institute of Genetics and Cytology, Northeast Normal University, Changchun 130024, China; (M.S.); (L.W.); (J.L.)
| | - Yu Zhang
- The Key Laboratory of Molecular Epigenetics of Ministry of Education (MOE), Northeast Normal University, Changchun 130024, China; (N.Z.); (H.L.); (M.D.); (B.H.)
- Correspondence: ; Tel.: +86-431-8509-9798
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11
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In Vitro Characterization of Doxorubicin-Mediated Stress-Induced Premature Senescence in Human Chondrocytes. Cells 2022; 11:cells11071106. [PMID: 35406671 PMCID: PMC8998002 DOI: 10.3390/cells11071106] [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: 03/01/2022] [Revised: 03/17/2022] [Accepted: 03/23/2022] [Indexed: 02/07/2023] Open
Abstract
Accumulation of senescent chondrocytes is thought to drive inflammatory processes and subsequent cartilage degeneration in age-related as well as posttraumatic osteoarthritis (OA). However, the underlying mechanisms of senescence and consequences on cartilage homeostasis are not completely understood so far. Therefore, suitable in vitro models are needed to study chondrocyte senescence. In this study, we established and evaluated a doxorubicin (Doxo)-based model of stress-induced premature senescence (SIPS) in human articular chondrocytes (hAC). Cellular senescence was determined by the investigation of various senescence associated (SA) hallmarks including β-galactosidase activity, expression of p16, p21, and SA secretory phenotype (SASP) markers (IL-6, IL-8, MMP-13), the presence of urokinase-type plasminogen activator receptor (uPAR), and cell cycle arrest. After seven days, Doxo-treated hAC displayed a SIPS-like phenotype, characterized by excessive secretion of SASP factors, enhanced uPAR-positivity, decreased proliferation rate, and increased β-galactosidase activity. This phenotype was proven to be stable seven days after the removal of Doxo. Moreover, Doxo-treated hAC exhibited increased granularity and flattened or fibroblast-like morphology. Further analysis implies that Doxo-mediated SIPS was driven by oxidative stress as demonstrated by increased ROS levels and NO release. Overall, we provide novel insights into chondrocyte senescence and present a suitable in vitro model for further studies.
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12
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Ghadaouia S, Olivier MA, Martinez A, Kientega T, Qin J, Lambert-Lanteigne P, Cardin GB, Autexier C, Malaquin N, Rodier F. Homologous recombination-mediated irreversible genome damage underlies telomere-induced senescence. Nucleic Acids Res 2021; 49:11690-11707. [PMID: 34725692 PMCID: PMC8599762 DOI: 10.1093/nar/gkab965] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 09/28/2021] [Accepted: 10/12/2021] [Indexed: 12/12/2022] Open
Abstract
Loss of telomeric DNA leads to telomere uncapping, which triggers a persistent, p53-centric DNA damage response that sustains a stable senescence-associated proliferation arrest. Here, we show that in normal cells telomere uncapping triggers a focal telomeric DNA damage response accompanied by a transient cell cycle arrest. Subsequent cell division with dysfunctional telomeres resulted in sporadic telomeric sister chromatid fusions that gave rise to next-mitosis genome instability, including non-telomeric DNA lesions responsible for a stable, p53-mediated, senescence-associated proliferation arrest. Unexpectedly, the blocking of Rad51/RPA-mediated homologous recombination, but not non-homologous end joining (NHEJ), prevented senescence despite multiple dysfunctional telomeres. When cells approached natural replicative senescence, interphase senescent cells displayed genome instability, whereas near-senescent cells that underwent mitosis despite the presence of uncapped telomeres did not. This suggests that these near-senescent cells had not yet acquired irreversible telomeric fusions. We propose a new model for telomere-initiated senescence where tolerance of telomere uncapping eventually results in irreversible non-telomeric DNA lesions leading to stable senescence. Paradoxically, our work reveals that senescence-associated tumor suppression from telomere shortening requires irreversible genome instability at the single-cell level, which suggests that interventions to repair telomeres in the pre-senescent state could prevent senescence and genome instability.
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Affiliation(s)
- Sabrina Ghadaouia
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, QC, H2X 0A9, Canada.,Institut du cancer de Montréal, Montreal, QC, H2X 0A9, Canada
| | - Marc-Alexandre Olivier
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, QC, H2X 0A9, Canada.,Institut du cancer de Montréal, Montreal, QC, H2X 0A9, Canada
| | - Aurélie Martinez
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, QC, H2X 0A9, Canada.,Institut du cancer de Montréal, Montreal, QC, H2X 0A9, Canada
| | - Tibila Kientega
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, QC, H2X 0A9, Canada.,Institut du cancer de Montréal, Montreal, QC, H2X 0A9, Canada
| | - Jian Qin
- Department of Anatomy and Cell Biology, McGill University, Montreal, QC, H3A 0C7, Canada.,Jewish General Hospital, Lady Davis Institute, Montreal, QC, H3T 1E2, Canada
| | | | - Guillaume B Cardin
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, QC, H2X 0A9, Canada.,Institut du cancer de Montréal, Montreal, QC, H2X 0A9, Canada
| | - Chantal Autexier
- Department of Anatomy and Cell Biology, McGill University, Montreal, QC, H3A 0C7, Canada.,Jewish General Hospital, Lady Davis Institute, Montreal, QC, H3T 1E2, Canada
| | - Nicolas Malaquin
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, QC, H2X 0A9, Canada.,Institut du cancer de Montréal, Montreal, QC, H2X 0A9, Canada
| | - Francis Rodier
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, QC, H2X 0A9, Canada.,Institut du cancer de Montréal, Montreal, QC, H2X 0A9, Canada.,Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montreal, QC, H3T 1J4, Canada
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13
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Abstract
Cell cycle involves a series of changes that lead to cell growth and division. Cell cycle analysis is crucial to understand cellular responses to changing environmental conditions. Since its inception, flow cytometry has been particularly useful for cell cycle analysis at single cell level due to its speed and precision. Previously, flow cytometric cell cycle analysis relied solely on the measurement of cellular DNA content. Later, methods were developed for multiparametric analysis. This review explains the journey of flow cytometry to understand different molecular and cellular events underlying cell cycle using various protocols. Recent advances in the field that overcome the shortcomings of traditional flow cytometry and expand its scope for cell cycle studies are also discussed.
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14
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Faragher RGA. Simple Detection Methods for Senescent Cells: Opportunities and Challenges. FRONTIERS IN AGING 2021; 2:686382. [PMID: 35822046 PMCID: PMC9261409 DOI: 10.3389/fragi.2021.686382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 05/26/2021] [Indexed: 12/20/2022]
Abstract
Cellular senescence, the irreversible growth arrest of cells from conditional renewal populations combined with a radical shift in their phenotype, is a hallmark of ageing in some mammalian species. In the light of this, interest in the detection of senescent cells in different tissues and different species is increasing. However much of the prior work in this area is heavily slanted towards studies conducted in humans and rodents; and in these species most studies concern primary fibroblasts or cancer cell lines rendered senescent through exposure to a variety of stressors. Complex techniques are now available for the detailed analysis of senescence in these systems. But, rather than focussing on these methods this review instead examines techniques for the simple and reproducible detection of senescent cells. Intended primary for the non-specialist who wishes to quickly detect senescent cells in tissues or species which may lack a significant evidence base on the phenomenon it emphasises the power of the original techniques used to demonstrate the senescence of cells, their interrelationship with other markers and their potential to inform on the senescent state in new species and archival specimens.
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15
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Pawge G, Khatik GL. p53 regulated senescence mechanism and role of its modulators in age-related disorders. Biochem Pharmacol 2021; 190:114651. [PMID: 34118220 DOI: 10.1016/j.bcp.2021.114651] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 06/05/2021] [Accepted: 06/08/2021] [Indexed: 10/21/2022]
Abstract
Multiple co-morbidities are associated with age, and there is a need for the broad-spectrum drug to prevent multiple regimens that may cause an adverse effect in the geriatric population. Cellular senescence is a primary mechanism for ageing in various tissues. p53, a tumor suppressor protein, plays a significant role in forming DNA damage foci and post different stress responses. DNA damage foci can be transient or persistent that can progress to DNA-SCARS inducing senescence. p53 also plays a role in apoptosis and negative regulation of SASP. Few upstream targets like FOXO4, MDM2, MDM4, USP7 control the availability of p53 for apoptosis. Hence, the senolytic therapies, modulating p53 upstream targets, can be a good approach for preventing age-related disorders. This review discusses the insights on the role of p53 in the formation of DNA-SCARS, various upstream target proteins, and pathways involved in p53 regulation. Further, the review aimed to include recently discovered small molecules acting on these upstream targets, and those can be modified using medicinal chemistry approaches to give successful senotherapeutics.
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Affiliation(s)
- Girija Pawge
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research- Raebareli, New Transit Campus, Bijnor-Sisendi Road, Sarojini Nagar, Near CRPF Base Camp, Lucknow, Uttar Pradesh 226301, India
| | - Gopal L Khatik
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research- Raebareli, New Transit Campus, Bijnor-Sisendi Road, Sarojini Nagar, Near CRPF Base Camp, Lucknow, Uttar Pradesh 226301, India.
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16
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Mehta IS, Riyahi K, Pereira RT, Meaburn KJ, Figgitt M, Kill IR, Eskiw CH, Bridger JM. Interphase Chromosomes in Replicative Senescence: Chromosome Positioning as a Senescence Biomarker and the Lack of Nuclear Motor-Driven Chromosome Repositioning in Senescent Cells. Front Cell Dev Biol 2021; 9:640200. [PMID: 34113611 PMCID: PMC8185894 DOI: 10.3389/fcell.2021.640200] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 02/25/2021] [Indexed: 01/10/2023] Open
Abstract
This study demonstrates, and confirms, that chromosome territory positioning is altered in primary senescent human dermal fibroblasts (HDFs). The chromosome territory positioning pattern is very similar to that found in HDFs made quiescent either by serum starvation or confluence; but not completely. A few chromosomes are found in different locations. One chromosome in particular stands out, chromosome 10, which is located in an intermediate location in young proliferating HDFs, but is found at the nuclear periphery in quiescent cells and in an opposing location of the nuclear interior in senescent HDFs. We have previously demonstrated that individual chromosome territories can be actively and rapidly relocated, with 15 min, after removal of serum from the culture media. These chromosome relocations require nuclear motor activity through the presence of nuclear myosin 1β (NM1β). We now also demonstrate rapid chromosome movement in HDFs after heat-shock at 42°C. Others have shown that heat shock genes are actively relocated using nuclear motor protein activity via actin or NM1β (Khanna et al., 2014; Pradhan et al., 2020). However, this current study reveals, that in senescent HDFs, chromosomes can no longer be relocated to expected nuclear locations upon these two types of stimuli. This coincides with a entirely different organisation and distribution of NM1β within senescent HDFs.
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Affiliation(s)
- Ishita S Mehta
- Centre for Genome Engineering and Maintenance, Division of Biosciences, Department of Life Sciences, College of Health, Medicine and Life Sciences, Kingston Lane, Brunel University London, Uxbridge, United Kingdom.,Tata Institute of Fundamental Research, Mumbai, India
| | - Kumars Riyahi
- Centre for Genome Engineering and Maintenance, Division of Biosciences, Department of Life Sciences, College of Health, Medicine and Life Sciences, Kingston Lane, Brunel University London, Uxbridge, United Kingdom
| | - Rita Torres Pereira
- Centre for Genome Engineering and Maintenance, Division of Biosciences, Department of Life Sciences, College of Health, Medicine and Life Sciences, Kingston Lane, Brunel University London, Uxbridge, United Kingdom
| | - Karen J Meaburn
- Centre for Genome Engineering and Maintenance, Division of Biosciences, Department of Life Sciences, College of Health, Medicine and Life Sciences, Kingston Lane, Brunel University London, Uxbridge, United Kingdom
| | - Martin Figgitt
- Centre for Genome Engineering and Maintenance, Division of Biosciences, Department of Life Sciences, College of Health, Medicine and Life Sciences, Kingston Lane, Brunel University London, Uxbridge, United Kingdom.,Department of Life Sciences, Birmingham City University, Birmingham, United Kingdom
| | - Ian R Kill
- Centre for Genome Engineering and Maintenance, Division of Biosciences, Department of Life Sciences, College of Health, Medicine and Life Sciences, Kingston Lane, Brunel University London, Uxbridge, United Kingdom
| | - Christopher H Eskiw
- Department of Food and Bioproduct Sciences, University of Saskatchewan, Saskatoon, SK, Canada
| | - Joanna M Bridger
- Centre for Genome Engineering and Maintenance, Division of Biosciences, Department of Life Sciences, College of Health, Medicine and Life Sciences, Kingston Lane, Brunel University London, Uxbridge, United Kingdom
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17
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Chee WY, Kurahashi Y, Kim J, Miura K, Okuzaki D, Ishitani T, Kajiwara K, Nada S, Okano H, Okada M. β-catenin-promoted cholesterol metabolism protects against cellular senescence in naked mole-rat cells. Commun Biol 2021; 4:357. [PMID: 33742113 PMCID: PMC7979689 DOI: 10.1038/s42003-021-01879-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 02/19/2021] [Indexed: 02/01/2023] Open
Abstract
The naked mole-rat (NMR; Heterocephalus glaber) exhibits cancer resistance and an exceptionally long lifespan of approximately 30 years, but the mechanism(s) underlying increased longevity in NMRs remains unclear. In the present study, we report unique mechanisms underlying cholesterol metabolism in NMR cells, which may be responsible for their anti-senescent properties. NMR fibroblasts expressed β-catenin abundantly; this high expression was linked to increased accumulation of cholesterol-enriched lipid droplets. Ablation of β-catenin or inhibition of cholesterol synthesis abolished lipid droplet formation and induced senescence-like phenotypes accompanied by increased oxidative stress. β-catenin ablation downregulated apolipoprotein F and the LXR/RXR pathway, which are involved in cholesterol transport and biogenesis. Apolipoprotein F ablation also suppressed lipid droplet accumulation and promoted cellular senescence, indicating that apolipoprotein F mediates β-catenin signaling in NMR cells. Thus, we suggest that β-catenin in NMRs functions to offset senescence by regulating cholesterol metabolism, which may contribute to increased longevity in NMRs.
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Affiliation(s)
- Woei-Yaw Chee
- grid.136593.b0000 0004 0373 3971Department of Oncogene Research, Research for Microbial Disease, Osaka University, Suita, Osaka Japan
| | - Yuriko Kurahashi
- grid.136593.b0000 0004 0373 3971Department of Oncogene Research, Research for Microbial Disease, Osaka University, Suita, Osaka Japan
| | - Junhyeong Kim
- grid.136593.b0000 0004 0373 3971Department of Oncogene Research, Research for Microbial Disease, Osaka University, Suita, Osaka Japan
| | - Kyoko Miura
- grid.274841.c0000 0001 0660 6749Department of Aging and Longevity Research, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
| | - Daisuke Okuzaki
- grid.136593.b0000 0004 0373 3971Genome Information Research Center, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan ,grid.136593.b0000 0004 0373 3971Human Immunology Lab, WPI Immunology Frontier Research Center, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Osaka, Japan
| | - Tohru Ishitani
- grid.136593.b0000 0004 0373 3971Department of Homeostatic Regulation, Research for Microbial Disease, Osaka University, Suita, Osaka Japan
| | - Kentaro Kajiwara
- grid.136593.b0000 0004 0373 3971Department of Oncogene Research, Research for Microbial Disease, Osaka University, Suita, Osaka Japan
| | - Shigeyuki Nada
- grid.136593.b0000 0004 0373 3971Department of Oncogene Research, Research for Microbial Disease, Osaka University, Suita, Osaka Japan
| | - Hideyuki Okano
- grid.26091.3c0000 0004 1936 9959Department of Physiology, Keio University School of Medicine, Shinjuku-ku, Tokyo Japan
| | - Masato Okada
- grid.136593.b0000 0004 0373 3971Department of Oncogene Research, Research for Microbial Disease, Osaka University, Suita, Osaka Japan
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18
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Ernst P, Heidel FH. Molecular Mechanisms of Senescence and Implications for the Treatment of Myeloid Malignancies. Cancers (Basel) 2021; 13:612. [PMID: 33557090 PMCID: PMC7913823 DOI: 10.3390/cancers13040612] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 01/30/2021] [Accepted: 02/01/2021] [Indexed: 01/07/2023] Open
Abstract
Senescence is a cellular state that is involved in aging-associated diseases but may also prohibit the development of pre-cancerous lesions and tumor growth. Senescent cells are actively secreting chemo- and cytokines, and this senescence-associated secretory phenotype (SASP) can contribute to both early anti-tumorigenic and long-term pro-tumorigenic effects. Recently, complex mechanisms of cellular senescence and their influence on cellular processes have been defined in more detail and, therefore, facilitate translational development of targeted therapies. In this review, we aim to discuss major molecular pathways involved in cellular senescence and potential therapeutic strategies, with a specific focus on myeloid malignancies.
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Affiliation(s)
- Philipp Ernst
- Internal Medicine 2, Hematology and Oncology, Jena University Hospital, 07747 Jena, Germany;
- Research Program “Else Kröner-Forschungskolleg AntiAge“, Jena University Hospital, 07747 Jena, Germany
| | - Florian H. Heidel
- Internal Medicine C, Hematology and Oncology, Stem Cell Transplantation and Palliative Care, Greifswald University Medicine, 17475 Greifswald, Germany
- Leibniz Institute on Aging, Fritz-Lipmann Institute, 07745 Jena, Germany
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19
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Dipeptidyl Peptidase-4 Inhibitor Decreases Allograft Vasculopathy Via Regulating the Functions of Endothelial Progenitor Cells in Normoglycemic Rats. Cardiovasc Drugs Ther 2020; 35:1111-1127. [PMID: 32623597 DOI: 10.1007/s10557-020-07013-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
PURPOSE Chronic rejection induces the occurrence of orthotopic allograft transplantation (OAT) vasculopathy, which results in failure of the donor organ. Numerous studies have demonstrated that in addition to regulating blood sugar homeostasis, dipeptidyl peptidase-4 (DPP-4) inhibitors can also provide efficacious therapeutic and protective effects against cardiovascular diseases. However, their effects on OAT-induced vasculopathy remain unknown. Thus, the aim of this study was to investigate the direct effects of sitagliptin on OAT vasculopathy in vivo and in vitro. METHODS The PVG/Seac rat thoracic aorta graft to ACI/NKyo rat abdominal aorta model was used to explore the effects of sitagliptin on vasculopathy. Human endothelial progenitor cells (EPCs) were used to investigate the possible underlying mechanisms. RESULTS We demonstrated that sitagliptin decreases vasculopathy in OAT ACI/NKyo rats. Treatment with sitagliptin decreased BNP and HMGB1 levels, increased GLP-1 activity and stromal cell-derived factor 1α (SDF-1α) expression, elevated the number of circulating EPCs, and improved the differentiation possibility of mononuclear cells to EPCs ex vivo. However, in vitro studies showed that recombinant B-type natriuretic peptide (BNP) and high mobility group box 1 (HMGB1) impaired EPC function, whereas these phenomena were reversed by glucagon-like peptide 1 (GLP-1) receptor agonist treatment. CONCLUSIONS We suggest that the mechanisms underlying sitagliptin-mediated inhibition of OAT vasculopathy probably occur through a direct increase in GLP-1 activity. In addition to the GLP-1-dependent pathway, sitagliptin may regulate SDF-1α levels and EPC function to reduce OAT-induced vascular injury. This study may provide new prevention and treatment strategies for DPP-4 inhibitors in chronic rejection-induced vasculopathy.
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20
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Azarm K, Bhardwaj A, Kim E, Smith S. Persistent telomere cohesion protects aged cells from premature senescence. Nat Commun 2020; 11:3321. [PMID: 32620872 PMCID: PMC7335080 DOI: 10.1038/s41467-020-17133-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Accepted: 06/05/2020] [Indexed: 01/29/2023] Open
Abstract
Human telomeres are bound by the telomere repeat binding proteins TRF1 and TRF2. Telomere shortening in human cells leads to a DNA damage response that signals replicative senescence. While insufficient loading of TRF2 at shortened telomeres contributes to the DNA damage response in senescence, the contribution of TRF1 to senescence induction has not been determined. Here we show that counter to TRF2 deficiency-mediated induction of DNA damage, TRF1 deficiency serves a protective role to limit induction of DNA damage induced by subtelomere recombination. Shortened telomeres recruit insufficient TRF1 and as a consequence inadequate tankyrase 1 to resolve sister telomere cohesion. Our findings suggest that the persistent cohesion protects short telomeres from inappropriate recombination. Ultimately, in the final division, telomeres are no longer able to maintain cohesion and subtelomere copying ensues. Thus, the gradual loss of TRF1 and concomitant persistent cohesion that occurs with telomere shortening ensures a measured approach to replicative senescence.
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Affiliation(s)
- Kameron Azarm
- Kimmel Center for Biology and Medicine at the Skirball Institute, Department of Pathology, New York University School of Medicine, New York, NY, 10016, USA
| | - Amit Bhardwaj
- Kimmel Center for Biology and Medicine at the Skirball Institute, Department of Pathology, New York University School of Medicine, New York, NY, 10016, USA
| | - Eugenie Kim
- Kimmel Center for Biology and Medicine at the Skirball Institute, Department of Pathology, New York University School of Medicine, New York, NY, 10016, USA
| | - Susan Smith
- Kimmel Center for Biology and Medicine at the Skirball Institute, Department of Pathology, New York University School of Medicine, New York, NY, 10016, USA.
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21
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Abdisalaam S, Bhattacharya S, Mukherjee S, Sinha D, Srinivasan K, Zhu M, Akbay EA, Sadek HA, Shay JW, Asaithamby A. Dysfunctional telomeres trigger cellular senescence mediated by cyclic GMP-AMP synthase. J Biol Chem 2020; 295:11144-11160. [PMID: 32540968 DOI: 10.1074/jbc.ra120.012962] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 06/11/2020] [Indexed: 12/14/2022] Open
Abstract
Defective DNA damage response (DDR) signaling is a common mechanism that initiates and maintains the cellular senescence phenotype. Dysfunctional telomeres activate DDR signaling, genomic instability, and cellular senescence, but the links among these events remains unclear. Here, using an array of biochemical and imaging techniques, including a highly regulatable CRISPR/Cas9 strategy to induce DNA double strand breaks specifically in the telomeres, ChIP, telomere immunofluorescence, fluorescence in situ hybridization (FISH), micronuclei imaging, and the telomere shortest length assay (TeSLA), we show that chromosome mis-segregation due to imperfect DDR signaling in response to dysfunctional telomeres creates a preponderance of chromatin fragments in the cytosol, which leads to a premature senescence phenotype. We found that this phenomenon is caused not by telomere shortening, but by cyclic GMP-AMP synthase (cGAS) recognizing cytosolic chromatin fragments and then activating the stimulator of interferon genes (STING) cytosolic DNA-sensing pathway and downstream interferon signaling. Significantly, genetic and pharmacological manipulation of cGAS not only attenuated immune signaling, but also prevented premature cellular senescence in response to dysfunctional telomeres. The findings of our study uncover a cellular intrinsic mechanism involving the cGAS-mediated cytosolic self-DNA-sensing pathway that initiates premature senescence independently of telomere shortening.
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Affiliation(s)
- Salim Abdisalaam
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Souparno Bhattacharya
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Shibani Mukherjee
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Debapriya Sinha
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Kalayarasan Srinivasan
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Mingrui Zhu
- Department of Pathology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Esra A Akbay
- Department of Pathology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Hesham A Sadek
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Jerry W Shay
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Aroumougame Asaithamby
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
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22
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Jaafar F, Durani LW, Makpol S. Chlorella vulgaris modulates the expression of senescence-associated genes in replicative senescence of human diploid fibroblasts. Mol Biol Rep 2019; 47:369-379. [PMID: 31642042 DOI: 10.1007/s11033-019-05140-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Accepted: 10/12/2019] [Indexed: 12/27/2022]
Abstract
Human diploid fibroblasts (HDFs) cultured in vitro have limited capacity to proliferate after population doubling is repeated several times, and they enter into a state known as replicative senescence or cellular senescence. This study aimed to investigate the effect of Chlorella vulgaris on the replicative senescence of HDFs by determining the expression of senescence-associated genes. Young and senescent HDFs were divided into untreated control and C. vulgaris-treated groups. A senescence-associated gene transcription analysis was carried out with qRT-PCR. Treatment of young HDFs with C. vulgaris reduced the expression of SOD1, CAT and CCS (p < 0.05). In addition, the expression of the SOD2 gene was increased with C. vulgaris treatment in young, pre-senescent and senescent HDFs (p < 0.05). Treatment of senescent HDFs with C. vulgaris resulted in the downregulation of TP53 gene expression. The expression of the CDKN2A gene was significantly decreased upon C. vulgaris treatment in young and senescent HDFs. C. vulgaris treatment was also found to significantly upregulate the expression of the MAPK14 gene in pre-senescent HDFs. In addition, the expression of MAPK14 was significantly upregulated compared to that in the untreated senescent HDFs (p < 0.05). In summary, the expression of senescence-associated genes related to antioxidants and the insulin/insulin-like growth factor-1 signalling, DNA damage-associated signalling, cell differentiation and cell proliferation pathways was modulated by C. vulgaris during replicative senescence of human diploid fibroblasts.
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Affiliation(s)
- Faizul Jaafar
- Department of Biochemistry, Faculty of Medicine, Level 17, Preclinical Building, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaakob Latif, Bandar Tun Razak, Cheras, 56000, Kuala Lumpur, Malaysia
| | - Lina Wati Durani
- Department of Biochemistry, Faculty of Medicine, Level 17, Preclinical Building, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaakob Latif, Bandar Tun Razak, Cheras, 56000, Kuala Lumpur, Malaysia
| | - Suzana Makpol
- Department of Biochemistry, Faculty of Medicine, Level 17, Preclinical Building, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaakob Latif, Bandar Tun Razak, Cheras, 56000, Kuala Lumpur, Malaysia.
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23
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A direct comparison of interphase FISH versus low-coverage single cell sequencing to detect aneuploidy reveals respective strengths and weaknesses. Sci Rep 2019; 9:10508. [PMID: 31324840 PMCID: PMC6642082 DOI: 10.1038/s41598-019-46606-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 06/21/2019] [Indexed: 01/09/2023] Open
Abstract
Aneuploidy has been reported to occur at remarkably high levels in normal somatic tissues using Fluorescence In Situ Hybridization (FISH). Recently, these reports were contradicted by single-cell low-coverage whole genome sequencing (scL-WGS) analyses, which showed aneuploidy frequencies at least an order of magnitude lower. To explain these seemingly contradictory findings, we used both techniques to analyze artificially generated mock aneuploid cells and cells with natural random aneuploidy. Our data indicate that while FISH tended to over-report aneuploidies, a modified 2-probe approach can accurately detect low levels of aneuploidy. Further, scL-WGS tends to underestimate aneuploidy levels, especially in a polyploid background.
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24
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Mitchell R, Mellows B, Sheard J, Antonioli M, Kretz O, Chambers D, Zeuner MT, Tomkins JE, Denecke B, Musante L, Joch B, Debacq-Chainiaux F, Holthofer H, Ray S, Huber TB, Dengjel J, De Coppi P, Widera D, Patel K. Secretome of adipose-derived mesenchymal stem cells promotes skeletal muscle regeneration through synergistic action of extracellular vesicle cargo and soluble proteins. Stem Cell Res Ther 2019; 10:116. [PMID: 30953537 PMCID: PMC6451311 DOI: 10.1186/s13287-019-1213-1] [Citation(s) in RCA: 115] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 02/12/2019] [Accepted: 03/13/2019] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND The mechanisms underpinning the regenerative capabilities of mesenchymal stem cells (MSC) were originally thought to reside in their ability to recognise damaged tissue and to differentiate into specific cell types that would replace defective cells. However, recent work has shown that molecules produced by MSCs (secretome), particularly those packaged in extracellular vesicles (EVs), rather than the cells themselves are responsible for tissue repair. METHODS Here we have produced a secretome from adipose-derived mesenchymal stem cells (ADSC) that is free of exogenous molecules by incubation within a saline solution. Various in vitro models were used to evaluate the effects of the secretome on cellular processes that promote tissue regeneration. A cardiotoxin-induced skeletal muscle injury model was used to test the regenerative effects of the whole secretome or isolated extracellular vesicle fraction in vivo. This was followed by bioinformatic analysis of the components of the protein and miRNA content of the secretome and finally compared to a secretome generated from a secondary stem cell source. RESULTS Here we have demonstrated that the secretome from adipose-derived mesenchymal stem cells shows robust effects on cellular processes that promote tissue regeneration. Furthermore, we show that the whole ADSC secretome is capable of enhancing the rate of skeletal muscle regeneration following acute damage. We assessed the efficacy of the total secretome compared with the extracellular vesicle fraction on a number of assays that inform on tissue regeneration and demonstrate that both fractions affect different aspects of the process in vitro and in vivo. Our in vitro, in vivo, and bioinformatic results show that factors that promote regeneration are distributed both within extracellular vesicles and the soluble fraction of the secretome. CONCLUSIONS Taken together, our study implies that extracellular vesicles and soluble molecules within ADSC secretome act in a synergistic manner to promote muscle generation.
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Affiliation(s)
- Robert Mitchell
- School of Biological Sciences, University of Reading, Reading, UK
| | - Ben Mellows
- School of Biological Sciences, University of Reading, Reading, UK
| | - Jonathan Sheard
- Stem Cell Biology and Regenerative Biology Group, School of Pharmacy, University of Reading, Reading, UK
- Sheard BioTech Ltd, 20-22 Wenlock Road, London, N1 7GU UK
| | | | - Oliver Kretz
- Department of Medicine III, Faculty of Medicine University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Renal Division, Medical Centre, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - David Chambers
- Wolfson Centre for Age-Related Diseases, King’s College, London, UK
| | - Marie-Theres Zeuner
- Stem Cell Biology and Regenerative Biology Group, School of Pharmacy, University of Reading, Reading, UK
| | - James E. Tomkins
- Stem Cell Biology and Regenerative Biology Group, School of Pharmacy, University of Reading, Reading, UK
| | - Bernd Denecke
- Interdisciplinary Centre for Clinical Research Aachen, RWTH Aachen University, Aachen, Germany
| | - Luca Musante
- Centre for Bioanalytical Sciences (CBAS), Dublin City University, Dublin, Ireland
| | - Barbara Joch
- Department of Neuroanatomy, Institute for Anatomy and Cell Biology, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | | | - Harry Holthofer
- Centre for Bioanalytical Sciences (CBAS), Dublin City University, Dublin, Ireland
- FRIAS Freiburg Institute for Advanced Studies, University of Freiburg, Freiburg, Germany
| | - Steve Ray
- Micregen, Alderley Edge, Manchester, UK
| | - Tobias B. Huber
- Department of Medicine III, Faculty of Medicine University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Renal Division, Medical Centre, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- FRIAS Freiburg Institute for Advanced Studies, University of Freiburg, Freiburg, Germany
- BIOSS Centre for Biological Signalling Studies and Centre for Systems Biology (ZBSA), Albert-Ludwigs-University, Freiburg, Germany
| | - Joern Dengjel
- FRIAS Freiburg Institute for Advanced Studies, University of Freiburg, Freiburg, Germany
- Department of Biology, University of Fribourg, Fribourg, Switzerland
| | - Paolo De Coppi
- Stem Cells & Regenerative Medicine Section, UCL Great Ormond Street Institute of Child Health, London, UK
| | - Darius Widera
- Stem Cell Biology and Regenerative Biology Group, School of Pharmacy, University of Reading, Reading, UK
| | - Ketan Patel
- School of Biological Sciences, University of Reading, Reading, UK
- FRIAS Freiburg Institute for Advanced Studies, University of Freiburg, Freiburg, Germany
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25
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Nassrally MS, Lau A, Wise K, John N, Kotecha S, Lee KL, Brooks RF. Cell cycle arrest in replicative senescence is not an immediate consequence of telomere dysfunction. Mech Ageing Dev 2019; 179:11-22. [PMID: 30710559 DOI: 10.1016/j.mad.2019.01.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 12/19/2018] [Accepted: 01/28/2019] [Indexed: 11/15/2022]
Abstract
In replicative senescence, cells with critically-short telomeres activate a DNA-damage response leading to cell-cycle arrest, while those without telomere dysfunction would be expected to cycle normally. However, population growth declines more gradually than such a simple binary switch between cycling and non-cycling states would predict. We show here that late-passage cultures of human fibroblasts are not a simple mixture of cycling and non-cycling cells. Rather, although some cells had short cycle times comparable to those of younger cells, others continued to divide but with greatly extended cycle times, indicating a more-gradual approach to permanent arrest. Remarkably, in late passage cells, the majority showed prominent DNA-damage foci positive for 53BP1, yet many continued to divide. Evidently, the DNA-damage-response elicited by critically-short telomeres is not initially strong enough for complete cell-cycle arrest. A similar continuation of the cell cycle in the face of an active DNA-damage response was also seen in cells treated with a low dose of doxorubicin sufficient to produce multiple 53BP1 foci in all nuclei. Cell cycle checkpoint engagement in response to DNA damage is thus weaker than generally supposed, explaining why an accumulation of dysfunctional telomeres is needed before marked cell cycle elongation or permanent arrest is achieved.
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Affiliation(s)
- M Shamim Nassrally
- King's College London, Faculty of Life Sciences & Medicine, Department of Anatomy, Guy's Campus, LONDON SE1 1UL, UK
| | - Ashley Lau
- King's College London, Faculty of Life Sciences & Medicine, Department of Anatomy, Guy's Campus, LONDON SE1 1UL, UK
| | - Katherine Wise
- King's College London, Faculty of Life Sciences & Medicine, Department of Anatomy, Guy's Campus, LONDON SE1 1UL, UK
| | - Noah John
- King's College London, Faculty of Life Sciences & Medicine, Department of Anatomy, Guy's Campus, LONDON SE1 1UL, UK
| | - Sanjeev Kotecha
- King's College London, Faculty of Life Sciences & Medicine, Department of Anatomy, Guy's Campus, LONDON SE1 1UL, UK
| | - Kar Lai Lee
- King's College London, Faculty of Life Sciences & Medicine, Department of Anatomy, Guy's Campus, LONDON SE1 1UL, UK
| | - Robert F Brooks
- King's College London, Faculty of Life Sciences & Medicine, Department of Anatomy, Guy's Campus, LONDON SE1 1UL, UK; St George's, University of London, Molecular and Clinical Sciences Research Institute, Mailpoint J2A, Cranmer Terrace, London, SW17 0RE, UK.
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26
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Bertschmann J, Thalappilly S, Riabowol K. The ING1a model of rapid cell senescence. Mech Ageing Dev 2019; 177:109-117. [DOI: 10.1016/j.mad.2018.06.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Revised: 05/21/2018] [Accepted: 06/16/2018] [Indexed: 12/17/2022]
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27
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Yang W, Han GH, Shin HY, Lee EJ, Cho H, Chay DB, Kim JH. Combined treatment with modulated electro-hyperthermia and an autophagy inhibitor effectively inhibit ovarian and cervical cancer growth. Int J Hyperthermia 2018; 36:9-20. [PMID: 30428738 DOI: 10.1080/02656736.2018.1528390] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
PURPOSE Modulated electro-hyperthermia (mEHT), known as oncothermia, is an anticancer therapy that induces radiofrequency thermal damage to the cancer tissues. This study aimed to evaluate the potential effectiveness of mEHT as a therapeutic tool in ovarian and cervical cancer. MATERIALS AND METHODS We used both tumor-bearing mice and ovarian and cervical OVCAR-3, SK-OV-3, HeLa and SNU-17 cancer cell lines to investigate the effects of mEHT in vivo and in vitro, respectively, and determine whether it was enhanced by cotreatment with an autophagy inhibitor. RESULTS We discovered that phosphorylation of p38, a stress-dependent kinase, was induced at the Thr180/Tyr182 residue in cancer cells exposed to mEHT. Apoptotic markers such as cleaved caspase-3 and poly-ADP ribose polymerase (PARP) were increased in OVCAR-3 and SNU-17 cells. Fluorescence-activated cell sorting (FACS) analysis showed a significant increase in the population of sub-G1 mEHT-exposed cells, which are dying and apoptotic cells. mEHT also reduced both weight and volume of xenograft tumors in mice transplanted with ovarian and cervical cancer cells and patient-derived cancer tissues. We determined that mEHT-induced cellular damage recovery was mediated by autophagy and, therefore, expectedly, cotreatment with mEHT and 3-methyladenine (3-MA), an autophagy inhibitor, more effectively inhibited cancer cell growth than individual treatment did. CONCLUSIONS mEHT treatment alone was sufficient to inhibit cancer growth, while a combined treatment with mEHT and an autophagy inhibitor amplified this inhibition effect.
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Affiliation(s)
- Wookyeom Yang
- a Department of Obstetrics and Gynecology, Gangnam Severance Hospital , Yonsei University College of Medicine , Seoul , Republic of Korea
| | - Gwan Hee Han
- a Department of Obstetrics and Gynecology, Gangnam Severance Hospital , Yonsei University College of Medicine , Seoul , Republic of Korea
| | - Ha-Yeon Shin
- a Department of Obstetrics and Gynecology, Gangnam Severance Hospital , Yonsei University College of Medicine , Seoul , Republic of Korea
| | - Eun-Ju Lee
- a Department of Obstetrics and Gynecology, Gangnam Severance Hospital , Yonsei University College of Medicine , Seoul , Republic of Korea
| | - Hanbyoul Cho
- a Department of Obstetrics and Gynecology, Gangnam Severance Hospital , Yonsei University College of Medicine , Seoul , Republic of Korea
| | - Doo Byung Chay
- a Department of Obstetrics and Gynecology, Gangnam Severance Hospital , Yonsei University College of Medicine , Seoul , Republic of Korea
| | - Jae-Hoon Kim
- a Department of Obstetrics and Gynecology, Gangnam Severance Hospital , Yonsei University College of Medicine , Seoul , Republic of Korea
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28
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Rivera-Mulia JC, Schwerer H, Besnard E, Desprat R, Trevilla-Garcia C, Sima J, Bensadoun P, Zouaoui A, Gilbert DM, Lemaitre JM. Cellular senescence induces replication stress with almost no affect on DNA replication timing. Cell Cycle 2018; 17:1667-1681. [PMID: 29963964 DOI: 10.1080/15384101.2018.1491235] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Organismal aging entails a gradual decline of normal physiological functions and a major contributor to this decline is withdrawal of the cell cycle, known as senescence. Senescence can result from telomere diminution leading to a finite number of population doublings, known as replicative senescence (RS), or from oncogene overexpression, as a protective mechanism against cancer. Senescence is associated with large-scale chromatin re-organization and changes in gene expression. Replication stress is a complex phenomenon, defined as the slowing or stalling of replication fork progression and/or DNA synthesis, which has serious implications for genome stability, and consequently in human diseases. Aberrant replication fork structures activate the replication stress response leading to the activation of dormant origins, which is thought to be a safeguard mechanism to complete DNA replication on time. However, the relationship between replicative stress and the changes in the spatiotemporal program of DNA replication in senescence progression remains unclear. Here, we studied the DNA replication program during senescence progression in proliferative and pre-senescent cells from donors of various ages by single DNA fiber combing of replicated DNA, origin mapping by sequencing short nascent strands and genome-wide profiling of replication timing (TRT). We demonstrate that, progression into RS leads to reduced replication fork rates and activation of dormant origins, which are the hallmarks of replication stress. However, with the exception of a delay in RT of the CREB5 gene in all pre-senescent cells, RT was globally unaffected by replication stress during entry into either oncogene-induced or RS. Consequently, we conclude that RT alterations associated with physiological and accelerated aging, do not result from senescence progression. Our results clarify the interplay between senescence, aging and replication programs and demonstrate that RT is largely resistant to replication stress.
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Affiliation(s)
| | - Hélène Schwerer
- b Laboratory of Genome and Stem Cell Plasticity in Development and Aging , Institute of Regenerative Medicine, U1183, Université de Montpellier , Montpellier Cedex , France
| | - Emilie Besnard
- b Laboratory of Genome and Stem Cell Plasticity in Development and Aging , Institute of Regenerative Medicine, U1183, Université de Montpellier , Montpellier Cedex , France
| | - Romain Desprat
- c Stem cell Core Facility SAFE-iPS INGESTEM , CHU Montpellier, Saint Eloi Hospital , Montpellier Cedex , France
| | | | - Jiao Sima
- a Department of Biological Science , Florida State University , Tallahassee , FL , USA
| | - Paul Bensadoun
- b Laboratory of Genome and Stem Cell Plasticity in Development and Aging , Institute of Regenerative Medicine, U1183, Université de Montpellier , Montpellier Cedex , France
| | - Anissa Zouaoui
- c Stem cell Core Facility SAFE-iPS INGESTEM , CHU Montpellier, Saint Eloi Hospital , Montpellier Cedex , France
| | - David M Gilbert
- a Department of Biological Science , Florida State University , Tallahassee , FL , USA.,d Center for Genomics and Personalized Medicine , Florida State University , Tallahassee , FL , USA
| | - Jean-Marc Lemaitre
- b Laboratory of Genome and Stem Cell Plasticity in Development and Aging , Institute of Regenerative Medicine, U1183, Université de Montpellier , Montpellier Cedex , France.,c Stem cell Core Facility SAFE-iPS INGESTEM , CHU Montpellier, Saint Eloi Hospital , Montpellier Cedex , France
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29
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Gadd45b deficiency promotes premature senescence and skin aging. Oncotarget 2017; 7:26935-48. [PMID: 27105496 PMCID: PMC5053623 DOI: 10.18632/oncotarget.8854] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Accepted: 04/12/2016] [Indexed: 12/14/2022] Open
Abstract
The GADD45 family of proteins functions as stress sensors in response to various physiological and environmental stressors. Here we show that primary mouse embryo fibroblasts (MEFs) from Gadd45b null mice proliferate slowly, accumulate increased levels of DNA damage, and senesce prematurely. The impaired proliferation and increased senescence in Gadd45b null MEFs is partially reversed by culturing at physiological oxygen levels, indicating that Gadd45b deficiency leads to decreased ability to cope with oxidative stress. Interestingly, Gadd45b null MEFs arrest at the G2/M phase of cell cycle, in contrast to other senescent MEFs, which arrest at G1. FACS analysis of phospho-histone H3 staining showed that Gadd45b null MEFs are arrested in G2 phase rather than M phase. H2O2 and UV irradiation, known to increase oxidative stress, also triggered increased senescence in Gadd45b null MEFs compared to wild type MEFs. In vivo evidence for increased senescence in Gadd45b null mice includes the observation that embryos from Gadd45b null mice exhibit increased senescence staining compared to wild type embryos. Furthermore, it is shown that Gadd45b deficiency promotes senescence and aging phenotypes in mouse skin. Together, these results highlight a novel role for Gadd45b in stress-induced senescence and in tissue aging.
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30
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Peng Y, Zhang R, Kong L, Shen Y, Xu D, Zheng F, Liu J, Wu Q, Jia B, Zhang J. Ginsenoside Rg3 inhibits the senescence of prostate stromal cells through down-regulation of interleukin 8 expression. Oncotarget 2017; 8:64779-64792. [PMID: 29029391 PMCID: PMC5630291 DOI: 10.18632/oncotarget.17616] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Accepted: 04/18/2017] [Indexed: 02/07/2023] Open
Abstract
Senescent stromal cells support the development of prostate cancer and are considered potential therapeutic targets. This research evaluated the regulatory effects of ginsenoside Rg3 on the senescence of prostatic stromal cells pre-incubated in medium supplemented with 0.5% fetal bovine serum. The results revealed that ginsenoside Rg3 decreased the number of stromal cells positively stained with a senescent cell marker (senescence-associated β-galactosidase). Ginsenoside Rg3 also increased the viability of stromal cells and promoted cell cycle transition from G0/G1 to S phase, as well as inhibited the carcinoma-associated fibroblast-like phenotype in prostate stromal cells, through the up-regulation of smooth muscle cell markers SM22 and smooth muscle myosin heavy chain. Conditioned medium collected from stromal cells treated with ginsenoside Rg3 exhibited an attenuated effect on the promotion of prostate cancer cell migration compared with conditioned medium from stromal cells without Rg3 treatment. Down-regulation of interleukin 8 (IL-8) in a dose- and time-dependent manner was observed in ginsenoside Rg3-treated stromal cells, and over-expression or addition of IL-8 reversed the anti-senescence role of Rg3 in prostate stromal cells. Furthermore, ginsenoside Rg3 down-regulated IL-8 expression by decreasing the reactive oxygen species level in prostatic stromal cells and reducing the transcriptional activity of IL-8 promoter by damping the transcription factors C/EBP β and p65 binding to IL-8 promoter. Our research revealed that ginsenoside Rg3 was able to inhibit prostate stromal cell senescence by down-regulating IL-8 expression. The results suggest a potential value for ginsenoside Rg3 in prostate cancer treatment through the targeting of pro-carcinogenic senescent stromal cells.
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Affiliation(s)
- Yanfei Peng
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Ran Zhang
- Department of Biochemistry and Molecular Biology, College of Life Science, Bioactive Materials Key Lab of Ministry of Education, Nankai University, Tianjin, China
| | - Lingfei Kong
- Department of Biochemistry and Molecular Biology, College of Life Science, Bioactive Materials Key Lab of Ministry of Education, Nankai University, Tianjin, China
| | - Yongmei Shen
- Department of Biochemistry and Molecular Biology, College of Life Science, Bioactive Materials Key Lab of Ministry of Education, Nankai University, Tianjin, China
| | - Da Xu
- Department of Pharmaceutics, School of Pharmacy, Rutgers University, New Brunswick, New Jersey, USA
| | - Fang Zheng
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Jianwei Liu
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Qian Wu
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Bona Jia
- Department of Biochemistry and Molecular Biology, College of Life Science, Bioactive Materials Key Lab of Ministry of Education, Nankai University, Tianjin, China
| | - Ju Zhang
- Department of Biochemistry and Molecular Biology, College of Life Science, Bioactive Materials Key Lab of Ministry of Education, Nankai University, Tianjin, China
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Shan X, Roberts C, Kim EJ, Brenner A, Grant G, Percec I. Transcriptional and Cell Cycle Alterations Mark Aging of Primary Human Adipose-Derived Stem Cells. Stem Cells 2017; 35:1392-1401. [PMID: 28211118 DOI: 10.1002/stem.2592] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Revised: 01/22/2017] [Accepted: 01/29/2017] [Indexed: 01/14/2023]
Abstract
Adult stem cells play a critical role in the maintenance of tissue homeostasis and prevention of aging. While the regenerative potential of stem cells with low cellular turnover, such as adipose-derived stem cells (ASCs), is increasingly recognized, the study of chronological aging in ASCs is technically difficult and remains poorly understood. Here, we use our model of chronological aging in primary human ASCs to examine genome-wide transcriptional networks. We demonstrate first that the transcriptome of aging ASCs is distinctly more stable than that of age-matched fibroblasts, and further, that age-dependent modifications in cell cycle progression and translation initiation specifically characterize aging ASCs in conjunction with increased nascent protein synthesis and a distinctly shortened G1 phase. Our results reveal novel chronological aging mechanisms in ASCs that are inherently different from differentiated cells and that may reflect an organismal attempt to meet the increased demands of tissue and organ homeostasis during aging. Stem Cells 2017;35:1392-1401.
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Affiliation(s)
- Xiaoyin Shan
- Department of Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Cleresa Roberts
- Department of Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Eun Ji Kim
- The Institute for Translational Medicine and Therapeutics, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Ariana Brenner
- Department of Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Gregory Grant
- The Institute for Translational Medicine and Therapeutics, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA.,Department of Genetics, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Ivona Percec
- Department of Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
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32
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Abstract
Usually, cells balance their growth with their division. Coordinating growth inputs with cell division ensures the proper timing of division when sufficient cell material is available and affects the overall rate of cell proliferation. At a very fundamental level, cellular replicative lifespan-defined as the number of times a cell can divide, is a manifestation of cell cycle control. Hence, control of mitotic cell divisions, especially when the commitment is made to a new round of cell division, is intimately linked to replicative aging of cells. In this chapter, we review our current understanding, and its shortcomings, of how unbalanced growth and division, can dramatically influence the proliferative potential of cells, often leading to cellular and organismal aging phenotypes. The interplay between growth and division also underpins cellular senescence (i.e., inability to divide) and quiescence, when cells exit the cell cycle but still retain their ability to divide.
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33
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Byun HO, Lee YK, Kim JM, Yoon G. Erratum to: From cell senescence to age-related diseases: differential mechanisms of action of senescence-associated secretory phenotypes. BMB Rep 2016; 49:641-650. [PMID: 27881217 DOI: 10.5483/bmbrep.2016.49.11.122] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Indexed: 01/14/2023] Open
Affiliation(s)
- Hae-Ok Byun
- Department of Biochemistry, Ajou University School of Medicine; Department of Biomedical Science, Graduate School Suwon 16499, Korea
| | - Young-Kyoung Lee
- Department of Biochemistry, Ajou University School of Medicine; Department of Biomedical Science, Graduate School Suwon 16499, Korea
| | - Jeong-Min Kim
- Department of Biochemistry, Ajou University School of Medicine; College of Natural Sciences, Ajou University, Suwon 16499, Korea
| | - Gyesoon Yoon
- Department of Biochemistry, Ajou University School of Medicine; Department of Biomedical Science, Graduate School Suwon 16499, Korea
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Wang T, Notta F, Navab R, Joseph J, Ibrahimov E, Xu J, Zhu CQ, Borgida A, Gallinger S, Tsao MS. Senescent Carcinoma-Associated Fibroblasts Upregulate IL8 to Enhance Prometastatic Phenotypes. Mol Cancer Res 2016; 15:3-14. [PMID: 27678171 DOI: 10.1158/1541-7786.mcr-16-0192] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 08/30/2016] [Accepted: 09/14/2016] [Indexed: 11/16/2022]
Abstract
Carcinoma-associated fibroblasts (CAF) represent a significant component of pancreatic cancer stroma and are biologically implicated in tumor progression. However, evidence of both cancer-promoting and -restraining properties amongst CAFs suggests the possibility of multiple phenotypic subtypes. Here, it is demonstrated that senescent CAFs promote pancreatic cancer invasion and metastasis compared with nonsenescent control CAFs using in vitro Transwell invasion models and in vivo xenograft mouse models. Screening by gene expression microarray and cytokine ELISA assays revealed IL8 to be upregulated in senescent CAFs. Experimental modulation through IL8 overexpression or receptor inhibition implicates the IL8 pathway as a mediator of the proinvasive effects of senescent CAFs. In a cohort of human pancreatic cancer cases, more abundant stromal senescence as indicated by p16 immunohistochemistry correlated with decreased survival in patients with early-stage disease. These data support senescent fibroblasts as a pathologically and clinically relevant feature of pancreatic cancer. The inhibition of senescent stroma-cancer signaling pathways has the potential to restrain pancreatic cancer progression. IMPLICATIONS Findings show that senescent cancer-associated fibroblasts secret excess IL8 to promote pancreatic cancer invasion and metastasis; thus, senescent CAFs represent a phenotypic subtype, challenging conventional assumptions that CAFs are a homogeneous population. Mol Cancer Res; 15(1); 3-14. ©2016 AACR.
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Affiliation(s)
- Tao Wang
- Princess Margaret Cancer Centre, University Health Network, Toronto, Canada.,Department of Pathology, University Health Network, Toronto, Canada.,Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada
| | - Faiyaz Notta
- Ontario Institute for Cancer Research, Toronto, Canada
| | - Roya Navab
- Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - Joella Joseph
- Princess Margaret Cancer Centre, University Health Network, Toronto, Canada.,Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada
| | - Emin Ibrahimov
- Princess Margaret Cancer Centre, University Health Network, Toronto, Canada.,Ontario Institute for Cancer Research, Toronto, Canada
| | - Jing Xu
- Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - Chang-Qi Zhu
- Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - Ayelet Borgida
- Zane Cohen Centre for Digestive Diseases, Mount Sinai Hospital, Toronto, Canada
| | - Steven Gallinger
- Department of General Surgery, University Health Network, Toronto, Canada.,Department of Surgery, University of Toronto, Toronto, Canada
| | - Ming-Sound Tsao
- Princess Margaret Cancer Centre, University Health Network, Toronto, Canada. .,Department of Pathology, University Health Network, Toronto, Canada.,Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada
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35
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Banasavadi-Siddegowda YK, Russell L, Frair E, Karkhanis VA, Relation T, Yoo JY, Zhang J, Sif S, Imitola J, Baiocchi R, Kaur B. PRMT5-PTEN molecular pathway regulates senescence and self-renewal of primary glioblastoma neurosphere cells. Oncogene 2016; 36:263-274. [PMID: 27292259 DOI: 10.1038/onc.2016.199] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Revised: 04/08/2016] [Accepted: 04/26/2016] [Indexed: 02/06/2023]
Abstract
Glioblastoma (GBM) represents the most common and aggressive histologic subtype among malignant astrocytoma and is associated with poor outcomes because of heterogeneous tumour cell population including mature non-stem-like cell and immature stem-like cells within the tumour. Thus, it is critical to find new target-specific therapeutic modalities. Protein arginine methyltransferase enzyme 5 (PRMT5) regulates many cellular processes through its methylation activity and its overexpression in GBM is associated with more aggressive disease. Previously, we have shown that silencing of PRMT5 expression in differentiated GBM cell lines results in apoptosis and reduced tumour growth in mice. Here, we report the critical role of PRMT5 in GBM differentiated cells (GBMDC) grown in serum and GBM neurospheres (GBMNS) grown as neurospheres in vitro. Our results uncover a very significant role for PRMT5 in GBMNS self-renewal capacity and proliferation. PRMT5 knockdown in GBMDC led to apoptosis, knockdown in GBMNS led to G1 cell cycle arrest through upregulation of p27 and hypophoshorylation of retinoblastoma protein, leading to senescence. Comparison of impact of PRMT5 on cellular signalling by the Human Phospho-Kinase Array and chromatin immunoprecipitation-PCR revealed that unlike GBMDC, PRMT5 regulates PTEN expression and controls Akt and ERk activity in GBMNS. In vivo transient depletion of PRMT5 decreased intracranial tumour size and growth rate in mice implanted with both primary tumour-derived GBMNS and GBMDC. This is the first study to identify PTEN as a potential downstream target of PRMT5 and PRMT5 is vital to support both mature and immature GBM tumour cell populations.
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Affiliation(s)
- Y K Banasavadi-Siddegowda
- Department of Neurological Surgery, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - L Russell
- Department of Neurological Surgery, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - E Frair
- Department of Neurological Surgery, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - V A Karkhanis
- Division of Hematology, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - T Relation
- Department of Neurological Surgery, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - J Y Yoo
- Department of Neurological Surgery, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - J Zhang
- Department of Biomedical Informatics, Center for Biostatistics, Columbus, OH, USA
| | - S Sif
- Department of Biological and Environmental Sciences, College of Arts and Sciences, Qatar University, Doha, Qatar
| | - J Imitola
- Laboratory for Neural Stem Cells and Functional Neurogenetics, Division of Neuroimmunology and Multiple Sclerosis, Departments of Neurology and Neuroscience, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - R Baiocchi
- Division of Hematology, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - B Kaur
- Department of Neurological Surgery, College of Medicine, The Ohio State University, Columbus, OH, USA
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The dual function of PRMT1 in modulating epithelial-mesenchymal transition and cellular senescence in breast cancer cells through regulation of ZEB1. Sci Rep 2016; 6:19874. [PMID: 26813495 PMCID: PMC4728496 DOI: 10.1038/srep19874] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 12/18/2015] [Indexed: 12/31/2022] Open
Abstract
Although the involvement of protein arginine methyltransferase 1 (PRMT1) in tumorigenesis has been reported, its roles in breast cancer progression and metastasis has not been elucidated. Here we identified PRMT1 as a key regulator of the epithelial-mesenchymal transition (EMT) in breast cancer. We showed that the EMT program induced by PRMT1 endowed the human mammary epithelial cells with cancer stem cell properties. Moreover, PRMT1 promoted the migratory and invasive behaviors in breast cancer cells. We also demonstrated that abrogation of PRMT1 expression in breast cancer cells abated metastasis in vivo in mouse model. In addition, knockdown of PRMT1 arrested cell growth in G1 tetraploidy and induced cellular senescence. Mechanistically, PRMT1 impacted EMT process and cellular senescence by mediating the asymmetric dimethylation of arginine 3 of histone H4 (H4R3me2as) at the ZEB1 promoter to activate its transcription, indicating the essential roles of this epigenetic control both in EMT and in senescence. Thus, we unraveled a dual function of PRMT1 in modulation of both EMT and senescence via regulating ZEB1. This finding points to the potent value of PRMT1 as a dual therapeutic target for preventing metastasis and for inhibiting cancer cell growth in malignant breast cancer patients.
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37
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Babizhayev MA, Yegorov YE. Tissue formation and tissue engineering through host cell recruitment or a potential injectable cell-based biocomposite with replicative potential: Molecular mechanisms controlling cellular senescence and the involvement of controlled transient telomerase activation therapies. J Biomed Mater Res A 2015; 103:3993-4023. [PMID: 26034007 DOI: 10.1002/jbm.a.35515] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2015] [Accepted: 05/18/2015] [Indexed: 01/04/2023]
Abstract
Accumulated data indicate that wound-care products should have a composition equivalent to that of the skin: a combination of particular growth factors and extracellular matrix (ECM) proteins endogenous to the skin, together with viable epithelial cells, fibroblasts, and mesenchymal stem cells (MSCs). Strategies consisting of bioengineered dressings and cell-based products have emerged for widespread clinical use; however, their performance is not optimal because chronic wounds persist as a serious unmet medical need. Telomerase, the ribonucleoprotein complex that adds telomeric repeats to the ends of chromosomes, is responsible for telomere maintenance, and its expression is associated with cell immortalization and, in certain cases, cancerogenesis. Telomerase contains a catalytic subunit, the telomerase reverse transcriptase (hTERT). Introduction of TERT into human cells extends both their lifespan and their telomeres to lengths typical of young cells. The regulation of TERT involves transcriptional and posttranscriptional molecular biology mechanisms. The manipulation, regulation of telomerase is multifactorial in mammalian cells, involving overall telomerase gene expression, post-translational protein-protein interactions, and protein phosphorylation. Reactive oxygen species (ROS) have been implicated in aging, apoptosis, and necrosis of cells in numerous diseases. Upon production of high levels of ROS from exogenous or endogenous generators, the redox balance is perturbed and cells are shifted into a state of oxidative stress, which subsequently leads to modifications of intracellular proteins and membrane lipid peroxidation and to direct DNA damage. When the oxidative stress is severe, survival of the cell is dependent on the repair or replacement of damaged molecules, which can result in induction of apoptosis in the injured with ROS cells. ROS-mediated oxidative stress induces the depletion of hTERT from the nucleus via export through the nuclear pores. Nuclear export is initiated by ROS-induced phosphorylation of tyrosine 707 within hTERT by the Src kinase family. It might be presumed that protection of mitochondria against oxidative stress is an important telomere length-independent function for telomerase in cell survival. Biotechnology companies are focused on development of therapeutic telomerase vaccines, telomerase inhibitors, and telomerase promoter-driven cell killing in oncology, have a telomerase antagonist in late preclinical studies. Anti-aging medicine-oriented groups have intervened on the market with products working on telomerase activation for a broad range of degenerative diseases in which replicative senescence or telomere dysfunction may play an important role. Since oxidative damage has been shown to shorten telomeres in tissue culture models, the adequate topical, transdermal, or systemic administration of antioxidants (such as, patented ocular administration of 1% N-acetylcarnosine lubricant eye drops in the treatment of cataracts) may be beneficial at preserving telomere lengths and delaying the onset or in treatment of disease in susceptible individuals. Therapeutic strategies toward controlled transient activation of telomerase are targeted to cells and replicative potential in cell-based therapies, tissue engineering and regenerative medicine.
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Affiliation(s)
- Mark A Babizhayev
- Innovative Vision Products, Inc., 3511 Silverside Road, Suite 105, County of New Castle, Delaware, 19810
| | - Yegor E Yegorov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, 32 Vavilov Street, Moscow, 119991, Russian Federation
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38
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Abstract
'Cellular senescence', a term originally defining the characteristics of cultured cells that exceed their replicative limit, has been broadened to describe durable states of proliferative arrest induced by disparate stress factors. Proposed relationships between cellular senescence, tumour suppression, loss of tissue regenerative capacity and ageing suffer from lack of uniform definition and consistently applied criteria. Here, we highlight caveats in interpreting the importance of suboptimal senescence-associated biomarkers, expressed either alone or in combination. We advocate that more-specific descriptors be substituted for the now broadly applied umbrella term 'senescence' in defining the suite of diverse physiological responses to cellular stress.
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Affiliation(s)
- Norman E Sharpless
- Department of Medicine and Genetics and The Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599-7295, USA
| | - Charles J Sherr
- Department of Tumor Cell Biology and The Howard Hughes Medical Institute, St. Jude Children's Research Hospital, Memphis, Tennessee 38105-2794, USA
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39
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Morgan JT, Raghunathan VK, Chang YR, Murphy CJ, Russell P. The intrinsic stiffness of human trabecular meshwork cells increases with senescence. Oncotarget 2015; 6:15362-74. [PMID: 25915531 PMCID: PMC4558157 DOI: 10.18632/oncotarget.3798] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2015] [Accepted: 03/20/2015] [Indexed: 12/26/2022] Open
Abstract
Dysfunction of the human trabecular meshwork (HTM) plays a central role in the age-associated disease glaucoma, a leading cause of irreversible blindness. The etiology remains poorly understood but cellular senescence, increased stiffness of the tissue, and the expression of Wnt antagonists such as secreted frizzled related protein-1 (SFRP1) have been implicated. However, it is not known if senescence is causally linked to either stiffness or SFRP1 expression. In this study, we utilized in vitro HTM senescence to determine the effect on cellular stiffening and SFRP1 expression. Stiffness of cultured cells was measured using atomic force microscopy and the morphology of the cytoskeleton was determined using immunofluorescent analysis. SFRP1 expression was measured using qPCR and immunofluorescent analysis. Senescent cell stiffness increased 1.88±0.14 or 2.57±0.14 fold in the presence or absence of serum, respectively. This was accompanied by increased vimentin expression, stress fiber formation, and SFRP1 expression. In aggregate, these data demonstrate that senescence may be a causal factor in HTM stiffening and elevated SFRP1 expression, and contribute towards disease progression. These findings provide insight into the etiology of glaucoma and, more broadly, suggest a causal link between senescence and altered tissue biomechanics in aging-associated diseases.
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Affiliation(s)
- Joshua T. Morgan
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, USA
| | - Vijay Krishna Raghunathan
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, USA
| | - Yow-Ren Chang
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, USA
| | - Christopher J. Murphy
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, USA
- Department of Ophthalmology &; Vision Science, School of Medicine, University of California, Davis, CA, USA
| | - Paul Russell
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, USA
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40
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Sidler C, Woycicki R, Li D, Wang B, Kovalchuk I, Kovalchuk O. A role for SUV39H1-mediated H3K9 trimethylation in the control of genome stability and senescence in WI38 human diploid lung fibroblasts. Aging (Albany NY) 2015; 6:545-63. [PMID: 25063769 PMCID: PMC4153622 DOI: 10.18632/aging.100678] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Cellular senescence has been associated with the age-dependent decline in tissue repair and regeneration, the increasing deterioration of the immune system, and the age-dependent increase in the incidence of cancer. Here, we show that senescence of human lung fibroblast WI-38 cells is associated with extensive changes to the gene expression profile, including the differential expression of transcriptional and epigenetic regulators. Among those, SUV39H1 was downregulated in senescent cells, correlated with a decrease in global H3K9 trimethylation, reduced H3K9me3 levels in repetitive DNA sequence regions such as satellites and transposable elements, and increased transcription of these repetitive DNA sequences. This indicates that SUV39H1 plays a role in limiting genomic instability in dividing cells and suggests that SUV39H1 downregulation may contribute to the establishment of senescence by increasing genomic instability. Additionally, the manipulation of SUV39H1 expression levels resulted in altered cell cycle distribution, suggesting a causal role of SUV39H1 in the establishment of cellular senescence. Thus, based on our findings and the results from previous reports, we propose a model in which SUV39H1 downregulation promotes the establishment of cellular senescence.
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Affiliation(s)
- Corinne Sidler
- Department of Biological Sciences, University of Lethbridge, Lethbridge, AB, T1K 3M4, Canada
| | - Rafal Woycicki
- Department of Biological Sciences, University of Lethbridge, Lethbridge, AB, T1K 3M4, Canada
| | - Dongping Li
- Department of Biological Sciences, University of Lethbridge, Lethbridge, AB, T1K 3M4, Canada
| | - Bo Wang
- Department of Biological Sciences, University of Lethbridge, Lethbridge, AB, T1K 3M4, Canada
| | - Igor Kovalchuk
- Department of Biological Sciences, University of Lethbridge, Lethbridge, AB, T1K 3M4, Canada
| | - Olga Kovalchuk
- Department of Biological Sciences, University of Lethbridge, Lethbridge, AB, T1K 3M4, Canada
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41
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Walen KH. Wound Healing Is a First Response in a Cancerous Pathway: Hyperplasia Developments to 4n Cell Cycling in Dysplasia Linked to Rb-Inactivation. ACTA ACUST UNITED AC 2015. [DOI: 10.4236/jct.2015.610099] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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42
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The mitochondrial genome in aging and senescence. Ageing Res Rev 2014; 18:1-15. [PMID: 25042573 DOI: 10.1016/j.arr.2014.07.001] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 07/07/2014] [Accepted: 07/09/2014] [Indexed: 12/15/2022]
Abstract
Aging is characterized by a progressive decline in organism functions due to the impairment of all organs. The deterioration of both proliferative tissues in liver, skin and the vascular system, as well as of largely post-mitotic organs, such as the heart and brain could be attributed at least in part to cell senescence. In this review we examine the role of mitochondrial dysfunction and mtDNA mutations in cell aging and senescence. Specifically, we address how p53 and telomerase reverse transcriptase (TERT) activity switch their roles from cytoprotective to detrimental and also examine the role of microRNAs in cell aging. The proposed role of Reactive Oxygen Species (ROS), both as mutating agents and as signalling molecules, underlying these processes is also described.
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43
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Lee T, Di Paola D, Malina A, Mills JR, Kreps A, Grosse F, Tang H, Zannis-Hadjopoulos M, Larsson O, Pelletier J. Suppression of the DHX9 helicase induces premature senescence in human diploid fibroblasts in a p53-dependent manner. J Biol Chem 2014; 289:22798-22814. [PMID: 24990949 PMCID: PMC4132785 DOI: 10.1074/jbc.m114.568535] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Revised: 07/02/2014] [Indexed: 12/28/2022] Open
Abstract
DHX9 is an ATP-dependent DEXH box helicase with a multitude of cellular functions. Its ability to unwind both DNA and RNA, as well as aberrant, noncanonical polynucleotide structures, has implicated it in transcriptional and translational regulation, DNA replication and repair, and maintenance of genome stability. We report that loss of DHX9 in primary human fibroblasts results in premature senescence, a state of irreversible growth arrest. This is accompanied by morphological defects, elevation of senescence-associated β-galactosidase levels, and changes in gene expression closely resembling those encountered during replicative (telomere-dependent) senescence. Activation of the p53 signaling pathway was found to be essential to this process. ChIP analysis and investigation of nascent DNA levels revealed that DHX9 is associated with origins of replication and that its suppression leads to a reduction of DNA replication. Our results demonstrate an essential role of DHX9 in DNA replication and normal cell cycle progression.
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Affiliation(s)
- Teresa Lee
- Department of Biochemistry, McGill University, Montreal, Quebec H3G 1Y6, Canada
| | - Domenic Di Paola
- Department of Biochemistry, McGill University, Montreal, Quebec H3G 1Y6, Canada
| | - Abba Malina
- Department of Biochemistry, McGill University, Montreal, Quebec H3G 1Y6, Canada
| | - John R Mills
- Department of Biochemistry, McGill University, Montreal, Quebec H3G 1Y6, Canada
| | - Amina Kreps
- Department of Biochemistry, McGill University, Montreal, Quebec H3G 1Y6, Canada
| | - Frank Grosse
- Leibniz Institute for Age Research, Fritz Lipmann Institute, Jena D-07745, Germany
| | - Hengli Tang
- Department of Biological Science, Florida State University, Tallahassee, Florida 32306
| | - Maria Zannis-Hadjopoulos
- Department of Biochemistry, McGill University, Montreal, Quebec H3G 1Y6, Canada,; Department of Oncology, McGill University, Montreal, Quebec H3A 1A3, Canada; The Rosalind and Morris Goodman Cancer Research Center, McGill University, Montreal, Quebec H3A 1A3, Canada, and
| | - Ola Larsson
- Department of Oncology-Pathology, Karolinska Institute, Stockholm 171 77, Sweden
| | - Jerry Pelletier
- Department of Biochemistry, McGill University, Montreal, Quebec H3G 1Y6, Canada,; Department of Oncology, McGill University, Montreal, Quebec H3A 1A3, Canada; The Rosalind and Morris Goodman Cancer Research Center, McGill University, Montreal, Quebec H3A 1A3, Canada, and.
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44
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Senescence induced by RECQL4 dysfunction contributes to Rothmund-Thomson syndrome features in mice. Cell Death Dis 2014; 5:e1226. [PMID: 24832598 PMCID: PMC4047874 DOI: 10.1038/cddis.2014.168] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 02/27/2014] [Accepted: 03/05/2014] [Indexed: 02/07/2023]
Abstract
Cellular senescence refers to irreversible growth arrest of primary eukaryotic cells, a process thought to contribute to aging-related degeneration and disease. Deficiency of RecQ helicase RECQL4 leads to Rothmund–Thomson syndrome (RTS), and we have investigated whether senescence is involved using cellular approaches and a mouse model. We first systematically investigated whether depletion of RECQL4 and the other four human RecQ helicases, BLM, WRN, RECQL1 and RECQL5, impacts the proliferative potential of human primary fibroblasts. BLM-, WRN- and RECQL4-depleted cells display increased staining of senescence-associated β-galactosidase (SA-β-gal), higher expression of p16INK4a or/and p21WAF1 and accumulated persistent DNA damage foci. These features were less frequent in RECQL1- and RECQL5-depleted cells. We have mapped the region in RECQL4 that prevents cellular senescence to its N-terminal region and helicase domain. We further investigated senescence features in an RTS mouse model, Recql4-deficient mice (Recql4HD). Tail fibroblasts from Recql4HD showed increased SA-β-gal staining and increased DNA damage foci. We also identified sparser tail hair and fewer blood cells in Recql4HD mice accompanied with increased senescence in tail hair follicles and in bone marrow cells. In conclusion, dysfunction of RECQL4 increases DNA damage and triggers premature senescence in both human and mouse cells, which may contribute to symptoms in RTS patients.
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45
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The higher-order structure in the cells nucleus as the structural basis of the post-mitotic state. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2014; 114:137-45. [DOI: 10.1016/j.pbiomolbio.2014.02.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Accepted: 02/09/2014] [Indexed: 11/19/2022]
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46
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Sidler C, Wóycicki R, Ilnytskyy Y, Metz G, Kovalchuk I, Kovalchuk O. Immunosenescence is associated with altered gene expression and epigenetic regulation in primary and secondary immune organs. Front Genet 2013; 4:211. [PMID: 24151501 PMCID: PMC3798808 DOI: 10.3389/fgene.2013.00211] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Accepted: 10/01/2013] [Indexed: 01/14/2023] Open
Abstract
Deterioration of the immune system (immunosenescence) with age is associated with an increased susceptibility to infection, autoimmune disease and cancer, and reduced responsiveness to vaccination. Immunosenescence entails a reduced supply of naïve T cells from the thymus and increased specialization of peripheral T cell clones. Both thymic involution and peripheral T cell homeostasis are thought to involve cellular senescence. In order to analyze this at the molecular level, we studied gene expression profiles, epigenetic status, and genome stability in the thymus and spleen of 1-, 4-, and 18-month-old Long Evans rats. In the thymus, altered gene expression, DNA and histone H3K9 hypomethylation, increased genome instability, and apoptosis were observed in 18-month-old animals compared to 1- and 4-month-old animals. In the spleen, alterations in gene expression and epigenetic regulation occurred already by the age of 4 months compared to 1 month and persisted in 18-month-old compared to 1-month-old rats. In both organs, these changes were accompanied by the altered composition of resident T cell populations. Our study suggests that both senescence and apoptosis may be involved in altered organ function.
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Affiliation(s)
- Corinne Sidler
- Department of Biological Sciences, University of Lethbridge Lethbridge, AB, Canada
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Palumbo E, Tosoni E, Russo A. General and specific replication profiles are detected in normal human cells by genome-wide and single-locus molecular combing. Exp Cell Res 2013; 319:3081-93. [PMID: 24126019 DOI: 10.1016/j.yexcr.2013.10.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 09/24/2013] [Accepted: 10/01/2013] [Indexed: 01/04/2023]
Abstract
Mammalian genomes are replicated under a flexible program, with random use of origins and variable fork rates, and many details of the process must be still unraveled. Molecular combing provides a set of direct data regarding the replication profile of eukaryotic cells: fork rates; organization of the replication clusters; proportion of unidirectional forks; and fork dynamics. In this study the replication profiles of different primary and immortalized non-cancer human cells (lymphocytes, lymphoblastoid cells, fibroblasts) were evaluated at the whole-genome level or within reference genomic regions harboring coding genes. It emerged that these different cell types are characterized by specific replication profiles. In primary fibroblasts, a remarkable fraction of the mammalian genome was found to be replicated by unidirectional forks, and interestingly, the proportion of unidirectional forks further increased in the replicating genome along the population divisions. A second difference concerned in the proportion of paused replication forks, again more frequent in primary fibroblasts than in PBL/lymphoblastoid cells. We concluded that these patterns, whose relevance could escape when genomic methods are applied, represent normal replication features. In single-locus analyses, unidirectional and paused replication forks were highly represented in all genomic regions considered with respect to the average estimates referring to the whole-genome. In addition, fork rates were significantly lower than whole-genome estimates. Instead, when considering the specificities of each genomic region investigated (early to late replication, normal or fragile site) no further differentiating features of replication profiles were detected. These data, representing the integration of genome-wide and single-locus analyses, highlight a large heterogeneity of replication profiles among cell types and within the genome, which should be considered for the correct use of replication datasets.
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Affiliation(s)
- Elisa Palumbo
- Department of Biology, University of Padova, Via U. Bassi 58/b, 35131 Padova, Italy.
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Whitfield MJ, Lee WCJ, Van Vliet KJ. Onset of heterogeneity in culture-expanded bone marrow stromal cells. Stem Cell Res 2013; 11:1365-77. [PMID: 24103495 DOI: 10.1016/j.scr.2013.09.004] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 09/10/2013] [Accepted: 09/11/2013] [Indexed: 01/14/2023] Open
Abstract
Inconsistencies among in vitro and in vivo experiments using adult mesenchymal stem cells (MSCs) confound development of therapeutic, regenerative medicine applications, and in vitro expansion is typically required to achieve sufficient cell numbers for basic research or clinical trials. Though heterogeneity in both morphology and differentiation capacity of culture-expanded cells is noted, sources and consequences are not well understood. Here, we endeavored to observe the onset of population heterogeneity by conducting long-term continuous in vitro observation of human adult bone marrow stromal cell (BMSC) populations, a subset of which has been shown to be stem cells (also known as bone marrow-derived MSCs). Semi-automated identification and tracking of cell division and migration enabled construction of cell lineage maps that incorporated cell morphology. We found that all BMSCs steadily grew larger over time; this growth was interrupted only when a cell divided, producing two equally sized, morphologically similar daughter cells. However, a finite probability existed that one or both of these daughters then continued to increase in size without dividing, apparently exiting the cell cycle. Thus, larger BMSCs are those cells that have exited the normal cell cycle. These results hold important implications for MSC in vitro culture expansion and biophysical sorting strategies.
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Affiliation(s)
- Matthew J Whitfield
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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Ahlf DR, Thomas PM, Kelleher NL. Developing top down proteomics to maximize proteome and sequence coverage from cells and tissues. Curr Opin Chem Biol 2013; 17:787-94. [PMID: 23988518 DOI: 10.1016/j.cbpa.2013.07.028] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Revised: 07/01/2013] [Accepted: 07/29/2013] [Indexed: 12/25/2022]
Abstract
Mass spectrometry based proteomics generally seeks to identify and characterize protein molecules with high accuracy and throughput. Recent speed and quality improvements to the independent steps of integrated platforms have removed many limitations to the robust implementation of top down proteomics (TDP) for proteins below 70 kDa. Improved intact protein separations coupled to high-performance instruments have increased the quality and number of protein and proteoform identifications. To date, TDP applications have shown >1000 protein identifications, expanding to an average of ∼3-4 more proteoforms for each protein detected. In the near future, increased fractionation power, new mass spectrometers and improvements in proteoform scoring will combine to accelerate the application and impact of TDP to this century's biomedical problems.
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Affiliation(s)
- Dorothy R Ahlf
- Department of Chemistry and Biochemistry and the Harper Cancer Institute, University of Notre Dame, Notre Dame, IN, United States
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Martien S, Pluquet O, Vercamer C, Malaquin N, Martin N, Gosselin K, Pourtier A, Abbadie C. Cellular senescence involves an intracrine prostaglandin E2 pathway in human fibroblasts. Biochim Biophys Acta Mol Cell Biol Lipids 2013; 1831:1217-27. [DOI: 10.1016/j.bbalip.2013.04.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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