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Tse-Kang S, Wani KA, Peterson ND, Page A, Pukkila-Worley R. Activation of intestinal immunity by pathogen effector-triggered aggregation of lysosomal TIR-1/SARM1. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2023.12.04.569946. [PMID: 38106043 PMCID: PMC10723332 DOI: 10.1101/2023.12.04.569946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2023]
Abstract
TIR-domain proteins with enzymatic activity are essential for immunity in plants, animals, and bacteria. However, it is not known how these proteins function in pathogen sensing in animals. We discovered that a TIR-domain protein (TIR-1/SARM1) is strategically expressed on the membranes of a lysosomal sub-compartment, which enables intestinal epithelial cells in the nematode C. elegans to survey for pathogen effector-triggered host damage. We showed that a redox active virulence effector secreted by the bacterial pathogen Pseudomonas aeruginosa alkalinized and condensed a specific subset of lysosomes by inducing intracellular oxidative stress. Concentration of TIR-1/SARM1 on the surface of these organelles triggered its multimerization, which engages its intrinsic NADase activity, to activate the p38 innate immune pathway and protect the host against microbial intoxication. Thus, lysosomal TIR-1/SARM1 is a sensor for oxidative stress induced by pathogenic bacteria to activate metazoan intestinal immunity.
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2
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Chen Y, Abbass M, Brock T, Hobbs G, Ciufo LA, Hopkins C, Arlt VM, Stürzenbaum SR. Environmental carcinogen benzo[a]pyrene alters neutral lipid storage via a cyp-35A2 mediated pathway in Caenorhabditis elegans. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 339:122731. [PMID: 37839680 DOI: 10.1016/j.envpol.2023.122731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 09/28/2023] [Accepted: 10/11/2023] [Indexed: 10/17/2023]
Abstract
Polycyclic aromatic hydrocarbons (PAHs), in particular benzo [a]pyrene (BaP), have been identified as carcinogenic components of tobacco smoke. In mammals, the toxicological response to BaP-diol-epoxide is driven by cytochrome P450 (CYP1A1), a pathway which is absent in Caenorhabditis elegans. In contrast, in worms prominently the CYP-35 enzyme family seems to be induced after BaP exposure. In C. elegans, BaP exposure reduces the accumulation of lysosomal neutral lipids in a dose dependent manner and the deletion of cyp-35A2 results in a significant elevation of neutral lipid metabolism. A cyp-35A2:mCherry;unc-47:GFP dual-labelled reporter strain facilitated the identification of three potential upstream regulators that drive BaP metabolism in worms, namely elt-2, nhr-49 and fos-1. This newly described reporter line is a powerful resource for future large-scale RNAi regarding toxicology and lipid metabolism screens.
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Affiliation(s)
- Yuzhi Chen
- King's College London, Faculty of Life Sciences and Medicine, Analytical, Environmental and Forensic Sciences Department, London, SE1 9NH, UK
| | - Mustafa Abbass
- King's College London, Faculty of Life Sciences and Medicine, Analytical, Environmental and Forensic Sciences Department, London, SE1 9NH, UK
| | | | - Gian Hobbs
- King's College London, Faculty of Life Sciences and Medicine, Analytical, Environmental and Forensic Sciences Department, London, SE1 9NH, UK
| | - Leonardo A Ciufo
- King's College London, Faculty of Life Sciences and Medicine, Analytical, Environmental and Forensic Sciences Department, London, SE1 9NH, UK
| | | | - Volker M Arlt
- King's College London, Faculty of Life Sciences and Medicine, Analytical, Environmental and Forensic Sciences Department, London, SE1 9NH, UK; Toxicology Department, GAB Consulting GmbH, 69126 Heidelberg, Germany
| | - Stephen R Stürzenbaum
- King's College London, Faculty of Life Sciences and Medicine, Analytical, Environmental and Forensic Sciences Department, London, SE1 9NH, UK.
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3
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Hajdú G, Somogyvári M, Csermely P, Sőti C. Lysosome-related organelles promote stress and immune responses in C. elegans. Commun Biol 2023; 6:936. [PMID: 37704756 PMCID: PMC10499889 DOI: 10.1038/s42003-023-05246-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 08/15/2023] [Indexed: 09/15/2023] Open
Abstract
Lysosome-related organelles (LROs) play diverse roles and their dysfunction causes immunodeficiency. However, their primordial functions remain unclear. Here, we report that C. elegans LROs (gut granules) promote organismal defenses against various stresses. We find that toxic benzaldehyde exposure induces LRO autofluorescence, stimulates the expression of LRO-specific genes and enhances LRO transport capacity as well as increases tolerance to benzaldehyde, heat and oxidative stresses, while these responses are impaired in glo-1/Rab32 and pgp-2 ABC transporter LRO biogenesis mutants. Benzaldehyde upregulates glo-1- and pgp-2-dependent expression of heat shock, detoxification and antimicrobial effector genes, which requires daf-16/FOXO and/or pmk-1/p38MAPK. Finally, benzaldehyde preconditioning increases resistance against Pseudomonas aeruginosa PA14 in a glo-1- and pgp-2-dependent manner, and PA14 infection leads to the deposition of fluorescent metabolites in LROs and induction of LRO genes. Our study suggests that LROs may play a role in systemic responses to stresses and in pathogen resistance.
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Affiliation(s)
- Gábor Hajdú
- Department of Molecular Biology, Semmelweis University, Budapest, Hungary
| | - Milán Somogyvári
- Department of Molecular Biology, Semmelweis University, Budapest, Hungary
| | - Péter Csermely
- Department of Molecular Biology, Semmelweis University, Budapest, Hungary
| | - Csaba Sőti
- Department of Molecular Biology, Semmelweis University, Budapest, Hungary.
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4
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Zhang M, Chen S, Dai Y, Duan T, Xu Y, Li X, Yang J, Zhu X. Aspartame and sucralose extend the lifespan and improve the health status of C. elegans. Food Funct 2021; 12:9912-9921. [PMID: 34486601 DOI: 10.1039/d1fo01579f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Aspartame (ASP) and sucralose (SUC) are non-nutritive sweeteners which are widely consumed worldwide. They are considered safe for human consumption, but their effects on certain physiological aspects, such as the lifespan or health status, of the organism have not yet been studied in depth and only limited data are available in the literature. The objectives of this study were to evaluate the effects of ASP and SUC on the lifespan and health indexes using Caenorhabditis elegans (C. elegans) as a model system. Interestingly, it was shown that at the concentrations tested, ASP (0.03-3 mg mL-1) showed an increasing trend of the mean lifespan of C. elegans, with a significant increase of 27.6% compared to the control at 3 mg mL-1. Similarly, SUC (ranging from 0.03 to 10 mg mL-1) also significantly increased the mean lifespan by 20.3% and 22.3% at 0.03 and 0.3 mg mL-1, respectively. However, 10 mg mL-1 SUC had a negative effect on the lifespan, though it did not reach a statistically significant level. In addition, ASP and SUC decreased lipofuscin accumulation and transiently improved motility, indicating improved health status. Nonetheless, they had different effects on food intake and intestinal fat deposition (IFD) at different intervals of time. Taken together, our findings revealed that ASP and SUC can prolong the lifespan and improve the health status of C. elegans.
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Affiliation(s)
- Mohan Zhang
- Wenzhou Center for Disease Control and Prevention, Wenzhou, Zhejiang 325000, China.,Department of Toxicology, Zhejiang University School of Public Health, Hangzhou, Zhejiang 310058, China
| | - Shuai Chen
- Wenzhou Center for Disease Control and Prevention, Wenzhou, Zhejiang 325000, China
| | - Yuhua Dai
- The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, Zhejiang 322000, China.
| | - Ting Duan
- Department of Toxicology, Zhejiang University School of Public Health, Hangzhou, Zhejiang 310058, China
| | - Yuying Xu
- Department of Toxicology, Zhejiang University School of Public Health, Hangzhou, Zhejiang 310058, China
| | - Xiaolin Li
- Technical Center for Animal, Plant and Food Inspection and Quarantine of Shanghai Customs district, Shanghai 200135, China
| | - Jun Yang
- Department of Toxicology, Hangzhou Normal University School of Medicine, Hangzhou, Zhejiang 311121, China. .,Zhejiang Provincial Center for Uterine Cancer Diagnosis and Therapy Research, The Affiliated Women's Hospital, Zhejiang University, Hangzhou, Zhejiang 310006, China
| | - Xinqiang Zhu
- The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, Zhejiang 322000, China. .,Department of Toxicology, Zhejiang University School of Public Health, Hangzhou, Zhejiang 310058, China
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5
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Chakraborty K, Anees P, Surana S, Martin S, Aburas J, Moutel S, Perez F, Koushika SP, Kratsios P, Krishnan Y. Tissue-specific targeting of DNA nanodevices in a multicellular living organism. eLife 2021; 10:67830. [PMID: 34318748 PMCID: PMC8360651 DOI: 10.7554/elife.67830] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 07/26/2021] [Indexed: 12/21/2022] Open
Abstract
Nucleic acid nanodevices present great potential as agents for logic-based therapeutic intervention as well as in basic biology. Often, however, the disease targets that need corrective action are localized in specific organs, and thus realizing the full potential of DNA nanodevices also requires ways to target them to specific cell types in vivo. Here, we show that by exploiting either endogenous or synthetic receptor-ligand interactions and leveraging the biological barriers presented by the organism, we can target extraneously introduced DNA nanodevices to specific cell types in Caenorhabditis elegans, with subcellular precision. The amenability of DNA nanostructures to tissue-specific targeting in vivo significantly expands their utility in biomedical applications and discovery biology.
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Affiliation(s)
- Kasturi Chakraborty
- Department of Chemistry, The University of Chicago, Chicago, United States.,Grossman Institute of Neuroscience, Quantitative Biology and Human Behavior, The University of Chicago, Chicago, United States
| | - Palapuravan Anees
- Department of Chemistry, The University of Chicago, Chicago, United States.,Grossman Institute of Neuroscience, Quantitative Biology and Human Behavior, The University of Chicago, Chicago, United States
| | - Sunaina Surana
- Department of Chemistry, The University of Chicago, Chicago, United States.,Grossman Institute of Neuroscience, Quantitative Biology and Human Behavior, The University of Chicago, Chicago, United States
| | - Simona Martin
- Department of Chemistry, The University of Chicago, Chicago, United States.,Grossman Institute of Neuroscience, Quantitative Biology and Human Behavior, The University of Chicago, Chicago, United States
| | - Jihad Aburas
- Department of Neurobiology, The University of Chicago, Chicago, United States
| | - Sandrine Moutel
- Recombinant Antibody Platform (TAb-IP), Institut Curie, PSL Research University, CNRS UMR144, Paris, France.,Cell Biology and Cancer Unit, Institut Curie, PSL Research University, CNRS UMR144, Paris, France
| | - Franck Perez
- Cell Biology and Cancer Unit, Institut Curie, PSL Research University, CNRS UMR144, Paris, France
| | - Sandhya P Koushika
- Department of Biological Sciences, Tata Institute of Fundamental Research, Mumbai, India
| | - Paschalis Kratsios
- Grossman Institute of Neuroscience, Quantitative Biology and Human Behavior, The University of Chicago, Chicago, United States.,Department of Neurobiology, The University of Chicago, Chicago, United States
| | - Yamuna Krishnan
- Department of Chemistry, The University of Chicago, Chicago, United States.,Grossman Institute of Neuroscience, Quantitative Biology and Human Behavior, The University of Chicago, Chicago, United States
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6
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Li Y, Ding W, Li CY, Liu Y. HLH-11 modulates lipid metabolism in response to nutrient availability. Nat Commun 2020; 11:5959. [PMID: 33235199 PMCID: PMC7686365 DOI: 10.1038/s41467-020-19754-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Accepted: 10/27/2020] [Indexed: 02/06/2023] Open
Abstract
The ability of organisms to sense nutrient availability and tailor their metabolic states to withstand nutrient deficiency is critical for survival. To identify previously unknown regulators that couple nutrient deficiency to body fat utilization, we performed a cherry-picked RNAi screen in C. elegans and found that the transcription factor HLH-11 regulates lipid metabolism in response to food availability. In well-fed worms, HLH-11 suppresses transcription of lipid catabolism genes. Upon fasting, the HLH-11 protein level is reduced through lysosome- and proteasome-mediated degradation, thus alleviating the inhibitory effect of HLH-11, activating the transcription of lipid catabolism genes, and utilizing fat. Additionally, lipid profiling revealed that reduction in the HLH-11 protein level remodels the lipid landscape in C. elegans. Moreover, TFAP4, the mammalian homolog of HLH-11, plays an evolutionarily conserved role in regulating lipid metabolism in response to starvation. Thus, TFAP4 may represent a potential therapeutic target for lipid storage disorders. Organismal metabolism fluctuates depending on nutritional conditions. Here, the authors show that, in C. elegans, HLH-11 negatively regulates lipid metabolism genes in the presence of nutrients and that its abundance decreased in response to starvation, thereby promoting fat utilization.
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Affiliation(s)
- Yi Li
- State Key Laboratory of Membrane Biology, Institute of Molecular Medicine, Peking University, 100871, Beijing, China.,Peking-Tsinghua Center for Life Sciences, Peking University, 100871, Beijing, China.,Academy for Advanced Interdisciplinary Studies, Peking University, 100871, Beijing, China
| | - Wanqiu Ding
- Laboratory of Bioinformatics and Genomic Medicine, Institute of Molecular Medicine, Peking University, 100871, Beijing, China
| | - Chuan-Yun Li
- Laboratory of Bioinformatics and Genomic Medicine, Institute of Molecular Medicine, Peking University, 100871, Beijing, China
| | - Ying Liu
- State Key Laboratory of Membrane Biology, Institute of Molecular Medicine, Peking University, 100871, Beijing, China. .,Peking-Tsinghua Center for Life Sciences, Peking University, 100871, Beijing, China. .,Beijing Advanced Innovation Center for Genomics, Peking University, 100871, Beijing, China.
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7
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Genetic Variation in Complex Traits in Transgenic α-Synuclein Strains of Caenorhabditis elegans. Genes (Basel) 2020; 11:genes11070778. [PMID: 32664512 PMCID: PMC7397059 DOI: 10.3390/genes11070778] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 07/07/2020] [Accepted: 07/08/2020] [Indexed: 11/16/2022] Open
Abstract
Different genetic backgrounds can modify the effect of mutated genes. Human α-synuclein (SNCA) gene encodes α-synuclein, and its oligomeric complexes accumulate with age and mediate the disruption of cellular homeostasis, resulting in the neuronal death that is characteristic of Parkinson’s Disease. Polymorphic variants modulate this complex pathologic mechanism. Previously, we constructed five transgenic introgression lines of a Caenorhabditis elegans model of α-synuclein using genetic backgrounds that are genetically diverse from the canonical wild-type Bristol N2. A gene expression analysis revealed that the α-synuclein transgene differentially affects genome-wide transcription due to background modifiers. To further investigate how complex traits are affected in these transgenic lines, we measured the α-synuclein transgene expression, the overall accumulation of the fusion protein of α-synuclein and yellow fluorescent protein (YFP), the lysosome-related organelles, and the body size. By using quantitative PCR (qPCR), we demonstrated stable and similar expression levels of the α-synuclein transgene in different genetic backgrounds. Strikingly, we observed that the levels of the a-synuclein:YFP fusion protein vary in different genetic backgrounds by using the COPAS™ biosorter. The quantification of the Nile Red staining assay demonstrates that α-synuclein also affects lysosome-related organelles and body size. Our results show that the same α-synuclein introgression in different C. elegans backgrounds can produces differing effects on complex traits due to background modifiers.
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8
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Higuchi-Sanabria R, Shen K, Kelet N, Frankino PA, Durieux J, Bar-Ziv R, Sing CN, Garcia EJ, Homentcovschi S, Sanchez M, Wu R, Tronnes SU, Joe L, Webster B, Ahilon-Jeronimo A, Monshietehadi S, Dallarda S, Pender C, Pon LA, Zoncu R, Dillin A. Lysosomal recycling of amino acids affects ER quality control. SCIENCE ADVANCES 2020; 6:eaaz9805. [PMID: 32637599 PMCID: PMC7319768 DOI: 10.1126/sciadv.aaz9805] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 05/13/2020] [Indexed: 06/11/2023]
Abstract
Recent work has highlighted the fact that lysosomes are a critical signaling hub of metabolic processes, providing fundamental building blocks crucial for anabolic functions. How lysosomal functions affect other cellular compartments is not fully understood. Here, we find that lysosomal recycling of the amino acids lysine and arginine is essential for proper ER quality control through the UPRER. Specifically, loss of the lysine and arginine amino acid transporter LAAT-1 results in increased sensitivity to proteotoxic stress in the ER and decreased animal physiology. We find that these LAAT-1-dependent effects are linked to glycine metabolism and transport and that the loss of function of the glycine transporter SKAT-1 also increases sensitivity to ER stress. Direct lysine and arginine supplementation, or glycine supplementation alone, can ameliorate increased ER stress sensitivity found in laat-1 mutants. These data implicate a crucial role in recycling lysine, arginine, and glycine in communication between the lysosome and ER.
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Affiliation(s)
- Ryo Higuchi-Sanabria
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Koning Shen
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Naame Kelet
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Phillip A. Frankino
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Jenni Durieux
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Raz Bar-Ziv
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Cierra N. Sing
- Department of Pathology and Cell Biology, Columbia University, New York, NY 10032, USA
| | - Enrique J. Garcia
- Department of Pathology and Cell Biology, Columbia University, New York, NY 10032, USA
| | - Stefan Homentcovschi
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Melissa Sanchez
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Rui Wu
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Sarah U. Tronnes
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Larry Joe
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Brant Webster
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Alex Ahilon-Jeronimo
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Samira Monshietehadi
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Sofia Dallarda
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Corinne Pender
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Liza A. Pon
- Department of Pathology and Cell Biology, Columbia University, New York, NY 10032, USA
| | - Roberto Zoncu
- Department of Biochemistry, Biophysics, and Structural Biology, University of California, Berkeley, Berkeley, CA 94720-3370, USA
| | - Andrew Dillin
- Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720-3370, USA
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9
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Wong SQ, Kumar AV, Mills J, Lapierre LR. C. elegans to model autophagy-related human disorders. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2020; 172:325-373. [PMID: 32620247 DOI: 10.1016/bs.pmbts.2020.01.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Autophagy is a highly conserved degradation process that clears damaged intracellular macromolecules and organelles in order to maintain cellular health. Dysfunctional autophagy is fundamentally linked to the development of various human disorders and pathologies. The use of the nematode Caenorhabditis elegans as a model system to study autophagy has improved our understanding of its regulation and function in organismal physiology. Here, we review the genetic, functional, and regulatory conservation of the autophagy pathway in C. elegans and we describe tools to quantify and study the autophagy process in this incredibly useful model organism. We further discuss how these nematodes have been modified to model autophagy-related human diseases and underscore the important insights obtained from such models. Altogether, we highlight the strengths of C. elegans as an exceptional tool to understand the genetic and molecular foundations underlying autophagy-related human diseases.
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Affiliation(s)
- Shi Quan Wong
- Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI, United States
| | - Anita V Kumar
- Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI, United States
| | - Joslyn Mills
- Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI, United States
| | - Louis R Lapierre
- Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI, United States.
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10
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Xia Q, Wu X, Rong K, Zhou Z, Li X, Fei T, Yin X. Lysosomal autophagy promotes recovery in rats with acute knee injury through TFEB mediation. J Orthop Surg Res 2020; 15:66. [PMID: 32085781 PMCID: PMC7035773 DOI: 10.1186/s13018-020-1573-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 01/23/2020] [Indexed: 02/07/2023] Open
Abstract
Background To study the role of lysosomal decomposition and elimination of old bone matrix, as well as the mechanism of promoting chondrocyte growth and bone recovery through the perspective of TFEB-mediated lysosomal autophagy. Methods Rat models of acute knee injury were designed, and autophagy flow was detected by injection of autophagy inhibitors 3-methyladenine. Autophagy flow was detected by RFP-GFP-LC3 double fluorescence molecule. The expression of TFEB, DRAM, MAPLC3, and MITF were analyzed by Western blot, and the expression of genes NITF, Bcl2, and TYR in rat cartilage tissues were detected by RT-PCR. Results The number of autophagosomes was increasing in the auto group compared with the inhibitor-auto group and normal group. There was a significant difference of LC3 levels in the auto group and inhibitor-auto group compared with the normal control. The expression of TFEB, DRAM, MAPLC3, and MITF proteins by Western blot analysis were significantly increased in the auto group and decreased in the inhibitor-auto group. The expression of NITF, Bcl2, and TYR by RT-PCR determination were higher in the auto group and inhibitor-auto group than the normal group. Conclusions Autophagy can inhibit apoptosis, promote chondrocyte growth and bone regeneration, and restore knee joint injury of rats. The main mechanism is to promote the effect of TFEB-mediated lysosomal autophagy.
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Affiliation(s)
- Qingquan Xia
- Department of Orthopedic, Minhang Hospital, Fudan University, No.39 Xinling Road, Minhang District, Shanghai, 201100, China
| | - Xuhua Wu
- Department of Orthopedic, Minhang Hospital, Fudan University, No.39 Xinling Road, Minhang District, Shanghai, 201100, China
| | - Ke Rong
- Department of Orthopedic, Minhang Hospital, Fudan University, No.39 Xinling Road, Minhang District, Shanghai, 201100, China.
| | - Zhenyu Zhou
- Department of Orthopedic, Minhang Hospital, Fudan University, No.39 Xinling Road, Minhang District, Shanghai, 201100, China
| | - Xujun Li
- Department of Orthopedic, Minhang Hospital, Fudan University, No.39 Xinling Road, Minhang District, Shanghai, 201100, China
| | - Teng Fei
- Department of Orthopedic, Minhang Hospital, Fudan University, No.39 Xinling Road, Minhang District, Shanghai, 201100, China
| | - Xiaofan Yin
- Department of Orthopedic, Minhang Hospital, Fudan University, No.39 Xinling Road, Minhang District, Shanghai, 201100, China
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11
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Pino EC, Soukas AA. Quantitative Profiling of Lipid Species in Caenorhabditis elegans with Gas Chromatography-Mass Spectrometry. Methods Mol Biol 2020; 2144:111-123. [PMID: 32410029 DOI: 10.1007/978-1-0716-0592-9_10] [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] [Indexed: 03/25/2024]
Abstract
Gas chromatography-mass spectrometry (GC-MS) enables sensitive detection and relative quantification of fatty acids. In Caenorhabditis elegans, the use of GC-MS can corroborate findings from common staining methodologies, providing great resolution on the lipid species altered in abundance in aging, genetic mutants, or with dietary or pharmacologic manipulation. Here we describe a method to quantitate relative abundance of fatty acids in total worm lipid extracts, as well as a method that quantitates fatty acids following separation into neutral lipid pools (triacylglycerols and cholesteryl esters) versus more polar lipids (phospholipids) by solid-phase extraction (SPE).
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Affiliation(s)
- Elizabeth C Pino
- Center for Translational Epidemiology and Comparative Effectiveness Research, Boston University School of Medicine, Boston, MA, USA
| | - Alexander A Soukas
- Department of Medicine, Endocrine Division, and Diabetes Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
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12
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Blackwell TK, Sewell AK, Wu Z, Han M. TOR Signaling in Caenorhabditis elegans Development, Metabolism, and Aging. Genetics 2019; 213:329-360. [PMID: 31594908 PMCID: PMC6781902 DOI: 10.1534/genetics.119.302504] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Accepted: 07/18/2019] [Indexed: 12/30/2022] Open
Abstract
The Target of Rapamycin (TOR or mTOR) is a serine/threonine kinase that regulates growth, development, and behaviors by modulating protein synthesis, autophagy, and multiple other cellular processes in response to changes in nutrients and other cues. Over recent years, TOR has been studied intensively in mammalian cell culture and genetic systems because of its importance in growth, metabolism, cancer, and aging. Through its advantages for unbiased, and high-throughput, genetic and in vivo studies, Caenorhabditis elegans has made major contributions to our understanding of TOR biology. Genetic analyses in the worm have revealed unexpected aspects of TOR functions and regulation, and have the potential to further expand our understanding of how growth and metabolic regulation influence development. In the aging field, C. elegans has played a leading role in revealing the promise of TOR inhibition as a strategy for extending life span, and identifying mechanisms that function upstream and downstream of TOR to influence aging. Here, we review the state of the TOR field in C. elegans, and focus on what we have learned about its functions in development, metabolism, and aging. We discuss knowledge gaps, including the potential pitfalls in translating findings back and forth across organisms, but also describe how TOR is important for C. elegans biology, and how C. elegans work has developed paradigms of great importance for the broader TOR field.
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Affiliation(s)
- T Keith Blackwell
- Research Division, Joslin Diabetes Center, Department of Genetics, Harvard Medical School, Harvard Stem Cell Institute, Boston, Massachusetts
| | - Aileen K Sewell
- Department of MCDB, University of Colorado at Boulder, and
- Howard Hughes Medical Institute, Boulder, Colorado
| | - Ziyun Wu
- Research Division, Joslin Diabetes Center, Department of Genetics, Harvard Medical School, Harvard Stem Cell Institute, Boston, Massachusetts
| | - Min Han
- Department of MCDB, University of Colorado at Boulder, and
- Howard Hughes Medical Institute, Boulder, Colorado
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13
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Zhang M, Yang X, Xu W, Cai X, Wang M, Xu Y, Yu P, Zhang J, Zheng Y, Chen J, Yang J, Zhu X. Evaluation of the effects of three sulfa sweeteners on the lifespan and intestinal fat deposition in C. elegans. Food Res Int 2019; 122:66-76. [PMID: 31229125 DOI: 10.1016/j.foodres.2019.03.028] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 02/22/2019] [Accepted: 03/12/2019] [Indexed: 02/01/2023]
Abstract
High sugar content in beverage or food can affect the aging process, and thus natural/artificial sweeteners are widely used as substitutes. However, whether sweeteners have such adverse effects as sugar remains to be clarified. Therefore, in the current study, three sulfa sweeteners, namely, saccharin sodium salt hydrate (SAC2), sodium cyclamate (CYC3) and acesulfame potassium (AceK4) were evaluated for their effects on the lifespan, deposition of lipofuscin, exercise activity, food intake, and intestinal fat deposition (IFD5) of Caenorhabditis elegans (C. elegans6). It was shown that SAC at 0.3 and 10 mg/mL shortened the lifespan of C. elegans and impaired the exercise capacity, while at other concentrations no significant effects were observed. In contrast, CYC at 0.1, 1 and 10 mg/mL prolonged the lifespan of C. elegans. On the other hand, AceK at 1 mg/mL increased the lifespan of C. elegans, and could decrease both lipofuscin deposition and IFD in a dose-dependent manner. Taken together, these results indicated that although SAC, CYC, and AceK all belong to the sulfa sweeteners, each has distinct effects on different physiological activities associated with aging, at least in C. elegans.
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Affiliation(s)
- Mohan Zhang
- Department of Toxicology, Zhejiang University School of Public Health, Hangzhou, Zhejiang 310058, China; Wenzhou Center for Disease Control and Prevention, Wenzhou, Zhejiang 325000, China
| | - Xin Yang
- Department of Toxicology, Zhejiang University School of Public Health, Hangzhou, Zhejiang 310058, China
| | - Wan Xu
- Department of Toxicology, Zhejiang University School of Public Health, Hangzhou, Zhejiang 310058, China
| | - Xiaobo Cai
- Department of Toxicology, Zhejiang University School of Public Health, Hangzhou, Zhejiang 310058, China
| | - Mingxiang Wang
- Department of Toxicology, Zhejiang University School of Public Health, Hangzhou, Zhejiang 310058, China
| | - Yuying Xu
- Department of Toxicology, Zhejiang University School of Public Health, Hangzhou, Zhejiang 310058, China
| | - Peilin Yu
- Department of Toxicology, Zhejiang University School of Public Health, Hangzhou, Zhejiang 310058, China
| | - Jun Zhang
- Department of Toxicology, Zhejiang University School of Public Health, Hangzhou, Zhejiang 310058, China
| | - Yifan Zheng
- Department of Toxicology, Zhejiang University School of Public Health, Hangzhou, Zhejiang 310058, China
| | - Jiang Chen
- Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou, Zhejiang 310051, China.
| | - Jun Yang
- Department of Toxicology, Hangzhou Normal University School of Medicine, Hangzhou, Zhejiang 311121, China.; Zhejiang Provincial Center for Uterine Cancer Diagnosis and Therapy Research, Hangzhou, Zhejiang 310006, China.
| | - Xinqiang Zhu
- Department of Toxicology, Zhejiang University School of Public Health, Hangzhou, Zhejiang 310058, China; The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, Zhejiang 322000, China.
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14
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Hühne R, Kessler V, Fürstberger A, Kühlwein S, Platzer M, Sühnel J, Lausser L, Kestler HA. 3D Network exploration and visualisation for lifespan data. BMC Bioinformatics 2018; 19:390. [PMID: 30352578 PMCID: PMC6199797 DOI: 10.1186/s12859-018-2393-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 09/25/2018] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND The Ageing Factor Database AgeFactDB contains a large number of lifespan observations for ageing-related factors like genes, chemical compounds, and other factors such as dietary restriction in different organisms. These data provide quantitative information on the effect of ageing factors from genetic interventions or manipulations of lifespan. Analysis strategies beyond common static database queries are highly desirable for the inspection of complex relationships between AgeFactDB data sets. 3D visualisation can be extremely valuable for advanced data exploration. RESULTS Different types of networks and visualisation strategies are proposed, ranging from basic networks of individual ageing factors for a single species to complex multi-species networks. The augmentation of lifespan observation networks by annotation nodes, like gene ontology terms, is shown to facilitate and speed up data analysis. We developed a new Javascript 3D network viewer JANet that provides the proposed visualisation strategies and has a customised interface for AgeFactDB data. It enables the analysis of gene lists in combination with AgeFactDB data and the interactive visualisation of the results. CONCLUSION Interactive 3D network visualisation allows to supplement complex database queries by a visually guided exploration process. The JANet interface allows gaining deeper insights into lifespan data patterns not accessible by common database queries alone. These concepts can be utilised in many other research fields.
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Affiliation(s)
- Rolf Hühne
- Institute of Medical Systems Biology - Ulm University, Albert-Einstein-Allee 11, Ulm, 89081 Germany
- Leibniz Institute on Aging - Fritz Lipmann Institute, Beutenbergstr. 11, Jena, 07745 Germany
| | - Viktor Kessler
- Institute of Medical Systems Biology - Ulm University, Albert-Einstein-Allee 11, Ulm, 89081 Germany
- Institute of Neural Information Processing - Ulm University, Albert-Einstein-Allee 11, Ulm, 89081 Germany
| | - Axel Fürstberger
- Institute of Medical Systems Biology - Ulm University, Albert-Einstein-Allee 11, Ulm, 89081 Germany
| | - Silke Kühlwein
- Institute of Medical Systems Biology - Ulm University, Albert-Einstein-Allee 11, Ulm, 89081 Germany
| | - Matthias Platzer
- Leibniz Institute on Aging - Fritz Lipmann Institute, Beutenbergstr. 11, Jena, 07745 Germany
| | - Jürgen Sühnel
- Leibniz Institute on Aging - Fritz Lipmann Institute, Beutenbergstr. 11, Jena, 07745 Germany
| | - Ludwig Lausser
- Institute of Medical Systems Biology - Ulm University, Albert-Einstein-Allee 11, Ulm, 89081 Germany
| | - Hans A. Kestler
- Institute of Medical Systems Biology - Ulm University, Albert-Einstein-Allee 11, Ulm, 89081 Germany
- Leibniz Institute on Aging - Fritz Lipmann Institute, Beutenbergstr. 11, Jena, 07745 Germany
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15
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Baxi K, Ghavidel A, Waddell B, Harkness TA, de Carvalho CE. Regulation of Lysosomal Function by the DAF-16 Forkhead Transcription Factor Couples Reproduction to Aging in Caenorhabditis elegans. Genetics 2017; 207:83-101. [PMID: 28696216 PMCID: PMC5586388 DOI: 10.1534/genetics.117.204222] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 07/03/2017] [Indexed: 02/06/2023] Open
Abstract
Aging in eukaryotes is accompanied by widespread deterioration of the somatic tissue. Yet, abolishing germ cells delays the age-dependent somatic decline in Caenorhabditis elegans In adult worms lacking germ cells, the activation of the DAF-9/DAF-12 steroid signaling pathway in the gonad recruits DAF-16 activity in the intestine to promote longevity-associated phenotypes. However, the impact of this pathway on the fitness of normally reproducing animals is less clear. Here, we explore the link between progeny production and somatic aging and identify the loss of lysosomal acidity-a critical regulator of the proteolytic output of these organelles-as a novel biomarker of aging in C. elegans The increase in lysosomal pH in older worms is not a passive consequence of aging, but instead is timed with the cessation of reproduction, and correlates with the reduction in proteostasis in early adult life. Our results further implicate the steroid signaling pathway and DAF-16 in dynamically regulating lysosomal pH in the intestine of wild-type worms in response to the reproductive cycle. In the intestine of reproducing worms, DAF-16 promotes acidic lysosomes by upregulating the expression of v-ATPase genes. These findings support a model in which protein clearance in the soma is linked to reproduction in the gonad via the active regulation of lysosomal acidification.
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Affiliation(s)
- Kunal Baxi
- Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan S7N5E2, Canada
| | - Ata Ghavidel
- Department of Anatomy and Cell Biology, University of Saskatchewan, Saskatoon, Saskatchewan S7N5E2, Canada
| | - Brandon Waddell
- Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan S7N5E2, Canada
| | - Troy A Harkness
- Department of Anatomy and Cell Biology, University of Saskatchewan, Saskatoon, Saskatchewan S7N5E2, Canada
| | - Carlos E de Carvalho
- Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan S7N5E2, Canada
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16
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Panda O, Akagi AE, Artyukhin AB, Judkins JC, Le HH, Mahanti P, Cohen SM, Sternberg PW, Schroeder FC. Biosynthesis of Modular Ascarosides in
C. elegans. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Oishika Panda
- Boyce Thompson Institute and Department of Chemistry and Chemical Biology Cornell University Ithaca NY USA
| | - Allison E. Akagi
- Howard Hughes Medical Institute and Division of Biology and Biological Engineering California Institute of Technology Pasadena CA USA
| | - Alexander B. Artyukhin
- Boyce Thompson Institute and Department of Chemistry and Chemical Biology Cornell University Ithaca NY USA
| | - Joshua C. Judkins
- Boyce Thompson Institute and Department of Chemistry and Chemical Biology Cornell University Ithaca NY USA
| | - Henry H. Le
- Boyce Thompson Institute and Department of Chemistry and Chemical Biology Cornell University Ithaca NY USA
| | - Parag Mahanti
- Boyce Thompson Institute and Department of Chemistry and Chemical Biology Cornell University Ithaca NY USA
| | - Sarah M. Cohen
- Boyce Thompson Institute and Department of Chemistry and Chemical Biology Cornell University Ithaca NY USA
- Howard Hughes Medical Institute and Division of Biology and Biological Engineering California Institute of Technology Pasadena CA USA
| | - Paul W. Sternberg
- Howard Hughes Medical Institute and Division of Biology and Biological Engineering California Institute of Technology Pasadena CA USA
| | - Frank C. Schroeder
- Boyce Thompson Institute and Department of Chemistry and Chemical Biology Cornell University Ithaca NY USA
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17
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Panda O, Akagi AE, Artyukhin AB, Judkins JC, Le HH, Mahanti P, Cohen SM, Sternberg PW, Schroeder FC. Biosynthesis of Modular Ascarosides in C. elegans. Angew Chem Int Ed Engl 2017; 56:4729-4733. [PMID: 28371259 DOI: 10.1002/anie.201700103] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 02/20/2017] [Indexed: 11/11/2022]
Abstract
The nematode Caenorhabditis elegans uses simple building blocks from primary metabolism and a strategy of modular assembly to build a great diversity of signaling molecules, the ascarosides, which function as a chemical language in this model organism. In the ascarosides, the dideoxysugar ascarylose serves as a scaffold to which diverse moieties from lipid, amino acid, neurotransmitter, and nucleoside metabolism are attached. However, the mechanisms that underlie the highly specific assembly of ascarosides are not understood. We show that the acyl-CoA synthetase ACS-7, which localizes to lysosome-related organelles, is specifically required for the attachment of different building blocks to the 4'-position of ascr#9. We further show that mutants lacking lysosome-related organelles are defective in the production of all 4'-modified ascarosides, thus identifying the waste disposal system of the cell as a hotspot for ascaroside biosynthesis.
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Affiliation(s)
- Oishika Panda
- Boyce Thompson Institute and Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, USA
| | - Allison E Akagi
- Howard Hughes Medical Institute and Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Alexander B Artyukhin
- Boyce Thompson Institute and Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, USA
| | - Joshua C Judkins
- Boyce Thompson Institute and Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, USA
| | - Henry H Le
- Boyce Thompson Institute and Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, USA
| | - Parag Mahanti
- Boyce Thompson Institute and Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, USA
| | - Sarah M Cohen
- Boyce Thompson Institute and Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, USA.,Howard Hughes Medical Institute and Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Paul W Sternberg
- Howard Hughes Medical Institute and Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Frank C Schroeder
- Boyce Thompson Institute and Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, USA
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18
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Abstract
Determination of cellular neutral lipid levels in yeast is important for both the biotechnology industry and biomedical research. However, many of the currently available methods are labor intensive and time consuming. Here we describe a rapid and repeatable method for the detection of neutral lipids, which can be utilized in both oleaginous and non-oleaginous yeast species. The method utilizes the fluorescent dye, Nile red, which enables neutral lipid levels to either be visualized via microscopy or quantified using a 96-well plate assay.
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Affiliation(s)
- Kerry Ann Rostron
- School of Pharmacy and Biomedical Sciences, University of Central Lancashire, Preston, Lancashire, UK
- School of Biological Sciences, University of Reading, Reading, Berkshire, UK
| | - Clare Louise Lawrence
- School of Pharmacy and Biomedical Sciences, University of Central Lancashire, Preston, Lancashire, PR1 2HE, UK.
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19
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A Genetic Screen for Mutants with Supersized Lipid Droplets in Caenorhabditis elegans. G3-GENES GENOMES GENETICS 2016; 6:2407-19. [PMID: 27261001 PMCID: PMC4978895 DOI: 10.1534/g3.116.030866] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
To identify genes that regulate the dynamics of lipid droplet (LD) size, we have used the genetically tractable model organism Caenorhabditis elegans, whose wild-type LD population displays a steady state of size with an upper limit of 3 μm in diameter. From a saturated forward genetic screen of 6.7 × 105 mutagenized haploid genomes, we isolated 118 mutants with supersized intestinal LDs often reaching 10 μm. These mutants define nine novel complementation groups, in addition to four known genes (maoc-1, dhs-28, daf-22, and prx-10). The nine groups are named drop (lipid droplet abnormal) and categorized into four classes. Class I mutants drop-5 and drop-9, similar to prx-10, are up-regulated in ACS-22-DGAT-2-dependent LD growth, resistant to LD hydrolysis, and defective in peroxisome import. Class II mutants drop-2, drop-3, drop-6, and drop-7 are up-regulated in LD growth, are resistant to LD hydrolysis, but are not defective in peroxisome import. Class III mutants drop-1 and drop-8 are neither up-regulated in LD growth nor resistant to LD hydrolysis, but seemingly up-regulated in LD fusion. Class IV mutant drop-4 is cloned as sams-1 and, different to the other three classes, is ACS-22-independent and hydrolysis-resistant. These four classes of supersized LD mutants should be valuable for mechanistic studies of LD cellular processes including growth, hydrolysis, and fusion.
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20
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Martorell P, Llopis S, Gonzalez N, Ramón D, Serrano G, Torrens A, Serrano JM, Navarro M, Genovés S. A nutritional supplement containing lactoferrin stimulates the immune system, extends lifespan, and reduces amyloid β peptide toxicity in Caenorhabditis elegans. Food Sci Nutr 2016; 5:255-265. [PMID: 28265360 PMCID: PMC5332254 DOI: 10.1002/fsn3.388] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 04/06/2016] [Accepted: 04/21/2016] [Indexed: 11/23/2022] Open
Abstract
Lactoferrin is a highly multifunctional glycoprotein involved in many physiological functions, including regulation of iron absorption and immune responses. Moreover, there is increasing evidence for neuroprotective effects of lactoferrin. We used Caenorhabditis elegans as a model to test the protective effects, both on phenotype and transcriptome, of a nutraceutical product based on lactoferrin liposomes. In a dose‐dependent manner, the lactoferrin‐based product protected against acute oxidative stress and extended lifespan of C. elegans N2. Furthermore, Paralysis of the transgenic C. elegans strain CL4176, caused by Aβ1‐42 aggregates, was clearly ameliorated by treatment. Transcriptome analysis in treated nematodes indicated immune system stimulation, together with enhancement of processes involved in the oxidative stress response. The lactoferrin‐based product also improved the protein homeostasis processes, cellular adhesion processes, and neurogenesis in the nematode. In summary, the tested product exerts protection against aging and neurodegeneration, modulating processes involved in oxidative stress response, protein homeostasis, synaptic function, and xenobiotic metabolism. This lactoferrin‐based product is also able to stimulate the immune system, as well as improving reproductive status and energy metabolism. These findings suggest that oral supplementation with this lactoferrin‐based product could improve the immune system and antioxidant capacity. Further studies to understand the molecular mechanisms related with neuronal function would be of interest.
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Affiliation(s)
- Patricia Martorell
- Cell Biology Laboratory Food Biotechnology Department Biópolis SL Paterna, Valencia 46980 Spain
| | - Silvia Llopis
- Cell Biology Laboratory Food Biotechnology Department Biópolis SL Paterna, Valencia 46980 Spain
| | - Nuria Gonzalez
- Cell Biology Laboratory Food Biotechnology Department Biópolis SL Paterna, Valencia 46980 Spain
| | - Daniel Ramón
- Cell Biology Laboratory Food Biotechnology Department Biópolis SL Paterna, Valencia 46980 Spain
| | - Gabriel Serrano
- Research and Development Department Sesderma Laboratories Rafelbuñol, Valencia 46138 Spain
| | - Ana Torrens
- Research and Development Department Sesderma Laboratories Rafelbuñol, Valencia 46138 Spain
| | - Juan M Serrano
- Research and Development Department Sesderma Laboratories Rafelbuñol, Valencia 46138 Spain
| | - Maria Navarro
- Research and Development Department Sesderma Laboratories Rafelbuñol, Valencia 46138 Spain
| | - Salvador Genovés
- Cell Biology Laboratory Food Biotechnology Department Biópolis SL Paterna, Valencia 46980 Spain
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21
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Yu CW, How CM, Liao VHC. Arsenite exposure accelerates aging process regulated by the transcription factor DAF-16/FOXO in Caenorhabditis elegans. CHEMOSPHERE 2016; 150:632-638. [PMID: 26796881 DOI: 10.1016/j.chemosphere.2016.01.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2015] [Revised: 01/01/2016] [Accepted: 01/04/2016] [Indexed: 06/05/2023]
Abstract
Arsenic is a known human carcinogen and high levels of arsenic contamination in food, soils, water, and air are of toxicology concerns. Nowadays, arsenic is still a contaminant of emerging interest, yet the effects of arsenic on aging process have received little attention. In this study, we investigated the effects and the underlying mechanisms of chronic arsenite exposure on the aging process in Caenorhabditis elegans. The results showed that prolonged arsenite exposure caused significantly decreased lifespan compared to non-exposed ones. In addition, arsenite exposure (100 μM) caused significant changes of age-dependent biomarkers, including a decrease of defecation frequency, accumulations of intestinal lipofuscin and lipid peroxidation in an age-dependent manner in C. elegans. Further evidence revealed that intracellular reactive oxygen species (ROS) level was significantly increased in an age-dependent manner upon 100 μM arsenite exposure. Moreover, the mRNA levels of transcriptional makers of aging (hsp-16.1, hsp-16.49, and hsp-70) were increased in aged worms under arsenite exposure (100 μM). Finally, we showed that daf-16 mutant worms were more sensitive to arsenite exposure (100 μM) on lifespan and failed to induce the expression of its target gene sod-3 in aged daf-16 mutant under arsenite exposure (100 μM). Our study demonstrated that chronic arsenite exposure resulted in accelerated aging process in C. elegans. The overproduction of intracellular ROS and the transcription factor DAF-16/FOXO play roles in mediating the accelerated aging process by arsenite exposure in C. elegans. This study implicates a potential ecotoxicological and health risk of arsenic in the environment.
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Affiliation(s)
- Chan-Wei Yu
- Department of Bioenvironmental Systems Engineering, National Taiwan University, No. 1 Roosevelt Road, Sec. 4, Taipei 106, Taiwan
| | - Chun Ming How
- Department of Bioenvironmental Systems Engineering, National Taiwan University, No. 1 Roosevelt Road, Sec. 4, Taipei 106, Taiwan
| | - Vivian Hsiu-Chuan Liao
- Department of Bioenvironmental Systems Engineering, National Taiwan University, No. 1 Roosevelt Road, Sec. 4, Taipei 106, Taiwan.
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22
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Abstract
The compact nervous system of Caenorhabditis elegans and its genetic tractability are features that make this organism highly suitable for investigating energy balance in an animal system. Here, we focus on molecular components and organizational principles emerging from the investigation of pathways that largely originate in the nervous system and regulate feeding behavior but also peripheral fat regulation through neuroendocrine signaling. We provide an overview of studies aimed at understanding how C. elegans integrate internal and external cues in feeding behavior. We highlight some of the similarities and differences in energy balance between C. elegans and mammals. We also provide our perspective on unresolved issues, both conceptual and technical, that we believe have hampered critical evaluation of findings relevant to fat regulation in C. elegans.
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Affiliation(s)
- George A Lemieux
- Department of Physiology, University of California, San Francisco, California 94158;
| | - Kaveh Ashrafi
- Department of Physiology, University of California, San Francisco, California 94158;
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23
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Carqueja (Baccharis trimera) Protects against Oxidative Stress and β-Amyloid-Induced Toxicity in Caenorhabditis elegans. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2015:740162. [PMID: 26236426 PMCID: PMC4508469 DOI: 10.1155/2015/740162] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Revised: 01/19/2015] [Accepted: 02/02/2015] [Indexed: 11/23/2022]
Abstract
Carqueja (Baccharis trimera) is a native plant found throughout South America. Several studies have shown that Carqueja has antioxidant activity in vitro, as well as anti-inflammatory, antidiabetic, analgesic, antihepatotoxic, and antimutagenic properties. However, studies regarding its antioxidant potential in vivo are limited. In this study, we used Caenorhabditis elegans as a model to examine the antioxidant effects of a Carqueja hydroalcoholic extract (CHE) on stress resistance and lifespan and to investigate whether CHE has a protective effect in a C. elegans model for Alzheimer's disease. Here, we show for the first time, using in vivo assays, that CHE treatment improved oxidative stress resistance by increasing survival rate and by reducing ROS levels under oxidative stress conditions independently of the stress-related signaling pathways (p38, JNK, and ERK) and transcription factors (SKN-1/Nrf and DAF-16/Foxo) tested here. CHE treatment also increased the defenses against β-amyloid toxicity in C. elegans, in part by increasing proteasome activity and the expression of two heat shock protein genes. Our findings suggest a potential neuroprotective use for Carqueja, supporting the idea that dietary antioxidants are a promising approach to boost the defensive systems against stress and neurodegeneration.
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24
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Bisphenol A exposure accelerated the aging process in the nematode Caenorhabditis elegans. Toxicol Lett 2015; 235:75-83. [DOI: 10.1016/j.toxlet.2015.03.010] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Revised: 03/20/2015] [Accepted: 03/23/2015] [Indexed: 11/19/2022]
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