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Zhang Y, Luo X, Zhu M, Wu Y. Evaluation the role of insulin signaling pathway in reproductive toxicity of dispersed diesel particulate extract under environmental conditions. Comp Biochem Physiol C Toxicol Pharmacol 2024; 283:109959. [PMID: 38866378 DOI: 10.1016/j.cbpc.2024.109959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 04/27/2024] [Accepted: 06/09/2024] [Indexed: 06/14/2024]
Abstract
Diesel particulate extract (DPE), which is a significant constituent of airborne particle pollution, has a strong association with the development of cancer and respiratory diseases. Fulvic acid (FA), a plentiful organic macromolecule found in water, has the capability to modify particle surface charge and adsorption capacity when combined with minerals. Nevertheless, there is a scarcity of data regarding the influence of their interaction on DPE toxicity. To examine the impact of environmental factor on the toxic effects of DPE, we used the Caenorhabditis elegans (C. elegans) model to investigate the reproductive toxicity of DPE and FA on insulin signaling pathway. C. elegans were subjected to a semi-fluid medium (NGG) containing different concentrations of DPE or DPE + FA in order to assess germline apoptosis and the expression of important genes in the insulin signaling pathway. Through several mutant strains, we found that daf-2, age-1, pdk-1, akt-1 and daf-16 were involved in DPE-induced apoptosis. Furthermore, and the expression levels of these genes significantly altered. The ratio of daf-16 translocation to nucleation, as well as the amount of reactive oxygen species (ROS), exhibited a dose-response relationship, however, the presence of FA could altered these effects. The results revealed that the insulin signaling pathway plays a vital role in mediating the harmful effects caused by DPE, whereas environmental factors have a substantial impact on its toxicity. Moreover, it was noted that semi-fluid medium could effectively replicate three-dimensional exposure circumstances closely resembling those observed in actual situations.
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Affiliation(s)
- Yajun Zhang
- Key Laboratory of Industrial Dust Prevention and Control & Occupational Health and Safety, Ministry of Education, Anhui University of Science & Technology, Huainan 232001, China; School of Public Health, Anhui University of Science & Technology, Hefei 231131, China.
| | - Xun Luo
- School of Biological Engineering, Huainan Normal University, Huainan 232038, China.
| | - Mengyun Zhu
- School of Biological Engineering, Huainan Normal University, Huainan 232038, China
| | - Yu Wu
- School of Biological Engineering, Huainan Normal University, Huainan 232038, China
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2
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Dubey AA, Sarkar A, Milcz K, Szulc NA, Thapa P, Piechota M, Serwa RA, Pokrzywa W. Floxuridine supports UPS independent of germline signaling and proteostasis regulators via involvement of detoxification in C. elegans. PLoS Genet 2024; 20:e1011371. [PMID: 39083540 DOI: 10.1371/journal.pgen.1011371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Accepted: 07/15/2024] [Indexed: 08/02/2024] Open
Abstract
The ubiquitin-proteasome system (UPS) is critical for maintaining proteostasis, influencing stress resilience, lifespan, and thermal adaptability in organisms. In Caenorhabditis elegans, specific proteasome subunits and activators, such as RPN-6, PBS-6, and PSME-3, are associated with heat resistance, survival at cold (4°C), and enhanced longevity at moderate temperatures (15°C). Previously linked to improving proteostasis, we investigated the impact of sterility-inducing floxuridine (FUdR) on UPS functionality under proteasome dysfunction and its potential to improve cold survival. Our findings reveal that FUdR significantly enhances UPS activity and resilience during proteasome inhibition or subunit deficiency, supporting worms' normal lifespan and adaptation to cold. Importantly, FUdR effect on UPS activity occurs independently of major proteostasis regulators and does not rely on the germ cells proliferation or spermatogenesis. Instead, FUdR activates a distinct detoxification pathway that supports UPS function, with GST-24 appearing to be one of the factors contributing to the enhanced activity of the UPS upon knockdown of the SKN-1-mediated proteasome surveillance pathway. Our study highlights FUdR unique role in the UPS modulation and its crucial contribution to enhancing survival under low-temperature stress, providing new insights into its mechanisms of action and potential therapeutic applications.
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Affiliation(s)
- Abhishek Anil Dubey
- Laboratory of Protein Metabolism, International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland
| | - Anwesha Sarkar
- Laboratory of Protein Metabolism, International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland
| | - Karolina Milcz
- Laboratory of Protein Metabolism, International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland
| | - Natalia A Szulc
- Laboratory of Protein Metabolism, International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland
| | - Pankaj Thapa
- Laboratory of Protein Metabolism, International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland
| | - Małgorzata Piechota
- Laboratory of Protein Metabolism, International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland
| | | | - Wojciech Pokrzywa
- Laboratory of Protein Metabolism, International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland
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3
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Traa A, Tamez González AA, Van Raamsdonk JM. Developmental disruption of the mitochondrial fission gene drp-1 extends the longevity of daf-2 insulin/IGF-1 receptor mutant. GeroScience 2024:10.1007/s11357-024-01276-z. [PMID: 39028454 DOI: 10.1007/s11357-024-01276-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Accepted: 06/27/2024] [Indexed: 07/20/2024] Open
Abstract
The dynamic nature of the mitochondrial network is regulated by mitochondrial fission and fusion, allowing for re-organization of mitochondria to adapt to the cell's ever-changing needs. As organisms age, mitochondrial fission and fusion become dysregulated and mitochondrial networks become increasingly fragmented. Modulation of mitochondrial dynamics has been shown to affect longevity in fungi, yeast, Drosophila and C. elegans. Disruption of the mitochondrial fission gene drp-1 drastically increases the already long lifespan of daf-2 insulin/IGF-1 signaling (IIS) mutants. In this work, we determined the conditions required for drp-1 disruption to extend daf-2 longevity and explored the molecular mechanisms involved. We found that knockdown of drp-1 during development is sufficient to extend daf-2 lifespan, while tissue-specific knockdown of drp-1 in neurons, intestine or muscle failed to increase daf-2 longevity. Disruption of other genes involved in mitochondrial fission also increased daf-2 lifespan as did treatment with RNA interference clones that decrease mitochondrial fragmentation. In exploring potential mechanisms involved, we found that deletion of drp-1 increases resistance to chronic stresses. In addition, we found that disruption of drp-1 increased mitochondrial and peroxisomal connectedness in daf-2 worms, increased oxidative phosphorylation and ATP levels, and increased mitophagy in daf-2 worms, but did not affect their ROS levels, food consumption or mitochondrial membrane potential. Disruption of mitophagy through RNA interference targeting pink-1 decreased the lifespan of daf-2;drp-1 worms suggesting that increased mitophagy contributes to their extended lifespan. Overall, this work defined the conditions under which drp-1 disruption increases daf-2 lifespan and has identified multiple changes in daf-2;drp-1 mutants that may contribute to their lifespan extension.
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Affiliation(s)
- Annika Traa
- Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
- Metabolic Disorders and Complications Program, Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
- Brain Repair and Integrative Neuroscience Program, Research Institute of the McGill University Health Centre, Montreal, QC, Canada
| | - Aura A Tamez González
- Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
- Metabolic Disorders and Complications Program, Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
- Brain Repair and Integrative Neuroscience Program, Research Institute of the McGill University Health Centre, Montreal, QC, Canada
| | - Jeremy M Van Raamsdonk
- Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada.
- Metabolic Disorders and Complications Program, Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada.
- Brain Repair and Integrative Neuroscience Program, Research Institute of the McGill University Health Centre, Montreal, QC, Canada.
- Division of Experimental Medicine, Department of Medicine, McGill University, Montreal, Quebec, Canada.
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4
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Bardan Sarmiento M, Gang SS, van Oosten-Hawle P, Troemel ER. CUL-6/cullin ubiquitin ligase-mediated degradation of HSP-90 by intestinal lysosomes promotes thermotolerance. Cell Rep 2024; 43:114279. [PMID: 38795346 PMCID: PMC11238739 DOI: 10.1016/j.celrep.2024.114279] [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: 12/11/2023] [Revised: 04/10/2024] [Accepted: 05/10/2024] [Indexed: 05/27/2024] Open
Abstract
Heat shock can be a lethal stressor. Previously, we described a CUL-6/cullin-ring ubiquitin ligase complex in the nematode Caenorhabditis elegans that is induced by intracellular intestinal infection and proteotoxic stress and that promotes improved survival upon heat shock (thermotolerance). Here, we show that CUL-6 promotes thermotolerance by targeting the heat shock protein HSP-90 for degradation. We show that CUL-6-mediated lowering of HSP-90 protein levels, specifically in the intestine, improves thermotolerance. Furthermore, we show that lysosomal function is required for CUL-6-mediated promotion of thermotolerance and that CUL-6 directs HSP-90 to lysosome-related organelles upon heat shock. Altogether, these results indicate that a CUL-6 ubiquitin ligase promotes organismal survival upon heat shock by promoting HSP-90 degradation in intestinal lysosomes. Thus, HSP-90, a protein commonly associated with protection against heat shock and promoting degradation of other proteins, is itself degraded to protect against heat shock.
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Affiliation(s)
| | - Spencer S Gang
- School of Biological Sciences, University of California, San Diego, La Jolla, CA, USA
| | | | - Emily R Troemel
- School of Biological Sciences, University of California, San Diego, La Jolla, CA, USA.
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5
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Rothi MH, Haddad JA, Sarkar GC, Mitchell W, Ying K, Pohl N, Sotomayor R, Natale J, Dellacono S, Gladyshev VN, Greer EL. The 18S rRNA Methyltransferase DIMT-1 Regulates Lifespan in the Germline Later in Life. RESEARCH SQUARE 2024:rs.3.rs-4421268. [PMID: 38946979 PMCID: PMC11213213 DOI: 10.21203/rs.3.rs-4421268/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/02/2024]
Abstract
Ribosome heterogeneity has emerged as an important regulatory control feature for determining which proteins are synthesized, however, the influence of age on ribosome heterogeneity is not fully understood. Whether mRNA transcripts are selectively translated in young versus old cells and whether dysregulation of this process drives organismal aging is unknown. Here we examined the role of ribosomal RNA (rRNA) methylation in maintaining appropriate translation as organisms age. In a directed RNAi screen, we identified the 18S rRNA N6'-dimethyl adenosine (m6,2A) methyltransferase, dimt-1, as a regulator of C. elegans lifespan and stress resistance. Lifespan extension induced by dimt-1 deficiency required a functional germline and was dependent on the known regulator of protein translation, the Rag GTPase, raga-1, which links amino acid sensing to the mechanistic target of rapamycin complex (mTORC)1. Using an auxin-inducible degron tagged version of dimt-1, we demonstrate that DIMT-1 functions in the germline after mid-life to regulate lifespan. We further found that knock-down of dimt-1 leads to selective translation of transcripts important for stress resistance and lifespan regulation in the C. elegans germline in mid-life including the cytochrome P450 daf-9, which synthesizes a steroid that signals from the germline to the soma to regulate lifespan. We found that dimt-1 induced lifespan extension was dependent on the daf-9 signaling pathway. This finding reveals a new layer of proteome dysfunction, beyond protein synthesis and degradation, as an important regulator of aging. Our findings highlight a new role for ribosome heterogeneity, and specific rRNA modifications, in maintaining appropriate translation later in life to promote healthy aging.
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Affiliation(s)
- M. Hafiz Rothi
- Department of Pediatrics, HMS Initiative for RNA Medicine, Harvard Medical School, Boston MA, USA
- Division of Newborn Medicine, Boston Children’s Hospital, Boston MA, USA
| | - Joseph Al Haddad
- Division of Newborn Medicine, Boston Children’s Hospital, Boston MA, USA
| | - Gautam Chandra Sarkar
- Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA
- Department of Genetics, Washington University School of Medicine, St. Louis, MO, USA
| | - Wayne Mitchell
- Division of Genetics, Department of Medicine, Brigham & Women’s Hospital, Harvard Medical School, Boston MA 02115, USA
| | - Kejun Ying
- Division of Newborn Medicine, Boston Children’s Hospital, Boston MA, USA
| | - Nancy Pohl
- Division of Newborn Medicine, Boston Children’s Hospital, Boston MA, USA
| | - Roberto Sotomayor
- Division of Newborn Medicine, Boston Children’s Hospital, Boston MA, USA
| | - Julia Natale
- Division of Newborn Medicine, Boston Children’s Hospital, Boston MA, USA
| | - Scarlett Dellacono
- Department of Pediatrics, HMS Initiative for RNA Medicine, Harvard Medical School, Boston MA, USA
- Division of Newborn Medicine, Boston Children’s Hospital, Boston MA, USA
| | - Vadim N. Gladyshev
- Division of Genetics, Department of Medicine, Brigham & Women’s Hospital, Harvard Medical School, Boston MA 02115, USA
| | - Eric Lieberman Greer
- Department of Pediatrics, HMS Initiative for RNA Medicine, Harvard Medical School, Boston MA, USA
- Division of Newborn Medicine, Boston Children’s Hospital, Boston MA, USA
- Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA
- Department of Genetics, Washington University School of Medicine, St. Louis, MO, USA
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6
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Molière A, Park JYC, Goyala A, Vayndorf EM, Zhang B, Hsiung KC, Jung Y, Kwon S, Statzer C, Meyer D, Nguyen R, Chadwick J, Thompson MA, Schumacher B, Lee SJV, Essmann CL, MacArthur MR, Kaeberlein M, David D, Gems D, Ewald CY. Improved resilience and proteostasis mediate longevity upon DAF-2 degradation in old age. GeroScience 2024:10.1007/s11357-024-01232-x. [PMID: 38900346 DOI: 10.1007/s11357-024-01232-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Accepted: 05/29/2024] [Indexed: 06/21/2024] Open
Abstract
Little is known about the possibility of reversing age-related biological changes when they have already occurred. To explore this, we have characterized the effects of reducing insulin/IGF-1 signaling (IIS) during old age. Reduction of IIS throughout life slows age-related decline in diverse species, most strikingly in the nematode Caenorhabditis elegans. Here we show that even at advanced ages, auxin-induced degradation of DAF-2 in single tissues, including neurons and the intestine, is still able to markedly increase C. elegans lifespan. We describe how reversibility varies among senescent changes. While senescent pathologies that develop in mid-life were not reversed, there was a rejuvenation of the proteostasis network, manifesting as a restoration of the capacity to eliminate otherwise intractable protein aggregates that accumulate with age. Moreover, resistance to several stressors was restored. These results support several new conclusions. (1) Loss of resilience is not solely a consequence of pathologies that develop in earlier life. (2) Restoration of proteostasis and resilience by inhibiting IIS is a plausible cause of the increase in lifespan. And (3), most interestingly, some aspects of the age-related transition from resilience to frailty can be reversed to a certain extent. This raises the possibility that the effect of IIS and related pathways on resilience and frailty during aging in higher animals might possess some degree of reversibility.
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Affiliation(s)
- Adrian Molière
- Laboratory of Extracellular Matrix Regeneration, Institute of Translational Medicine, Department of Health Sciences and Technology, ETH Zürich, CH-8603, Schwerzenbach, Switzerland
| | - Ji Young Cecilia Park
- Laboratory of Extracellular Matrix Regeneration, Institute of Translational Medicine, Department of Health Sciences and Technology, ETH Zürich, CH-8603, Schwerzenbach, Switzerland
| | - Anita Goyala
- Laboratory of Extracellular Matrix Regeneration, Institute of Translational Medicine, Department of Health Sciences and Technology, ETH Zürich, CH-8603, Schwerzenbach, Switzerland
| | - Elena M Vayndorf
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA, 98195-7470, USA
| | - Bruce Zhang
- Institute of Healthy Ageing, and Research Department of Genetics, Evolution and Environment, University College London, London, UK
| | - Kuei Ching Hsiung
- Institute of Healthy Ageing, and Research Department of Genetics, Evolution and Environment, University College London, London, UK
| | - Yoonji Jung
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, South Korea
| | - Sujeong Kwon
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, South Korea
| | - Cyril Statzer
- Laboratory of Extracellular Matrix Regeneration, Institute of Translational Medicine, Department of Health Sciences and Technology, ETH Zürich, CH-8603, Schwerzenbach, Switzerland
| | - David Meyer
- Institute for Genome Stability in Aging and Disease, Medical Faculty, University Hospital and University of Cologne, Joseph-Stelzmann-Str. 26, 50931, Cologne, Germany
- Cologne Excellence Cluster for Cellular Stress Responses in Aging-Associated Diseases (CECAD), Center for Molecular Medicine Cologne (CMMC), University of Cologne, Joseph-Stelzmann-Str. 26, 50931, Cologne, Germany
| | - Richard Nguyen
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA, 98195-7470, USA
| | | | | | - Björn Schumacher
- Institute for Genome Stability in Aging and Disease, Medical Faculty, University Hospital and University of Cologne, Joseph-Stelzmann-Str. 26, 50931, Cologne, Germany
- Cologne Excellence Cluster for Cellular Stress Responses in Aging-Associated Diseases (CECAD), Center for Molecular Medicine Cologne (CMMC), University of Cologne, Joseph-Stelzmann-Str. 26, 50931, Cologne, Germany
| | - Seung-Jae V Lee
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, South Korea
| | - Clara L Essmann
- Bioinformatics and Molecular Genetics, Institute of Biology III, Faculty of Biology, Albert-Ludwigs-University Freiburg, 79108, Freiburg, Germany
| | - Michael R MacArthur
- Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, NJ, 08540, USA
| | - Matt Kaeberlein
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA, 98195-7470, USA
| | | | - David Gems
- Institute of Healthy Ageing, and Research Department of Genetics, Evolution and Environment, University College London, London, UK
| | - Collin Y Ewald
- Laboratory of Extracellular Matrix Regeneration, Institute of Translational Medicine, Department of Health Sciences and Technology, ETH Zürich, CH-8603, Schwerzenbach, Switzerland.
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7
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Kovács D, Biró JB, Ahmed S, Kovács M, Sigmond T, Hotzi B, Varga M, Vincze VV, Mohammad U, Vellai T, Barna J. Age-dependent heat shock hormesis to HSF-1 deficiency suggests a compensatory mechanism mediated by the unfolded protein response and innate immunity in young Caenorhabditis elegans. Aging Cell 2024:e14246. [PMID: 38895933 DOI: 10.1111/acel.14246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 05/31/2024] [Accepted: 06/04/2024] [Indexed: 06/21/2024] Open
Abstract
The transcription factor HSF-1 (heat shock factor 1) acts as a master regulator of heat shock response in eukaryotic cells to maintain cellular proteostasis. The protein has a protective role in preventing cells from undergoing ageing, and neurodegeneration, and also mediates tumorigenesis. Thus, modulating HSF-1 activity in humans has a promising therapeutic potential for treating these pathologies. Loss of HSF-1 function is usually associated with impaired stress tolerance. Contrary to this conventional knowledge, we show here that inactivation of HSF-1 in the nematode Caenorhabditis elegans results in increased thermotolerance at young adult stages, whereas HSF-1 deficiency in animals passing early adult stages indeed leads to decreased thermotolerance, as compared to wild-type. Furthermore, a gene expression analysis supports that in young adults, distinct cellular stress response and immunity-related signaling pathways become induced upon HSF-1 deficiency. We also demonstrate that increased tolerance to proteotoxic stress in HSF-1-depleted young worms requires the activity of the unfolded protein response of the endoplasmic reticulum and the SKN-1/Nrf2-mediated oxidative stress response pathway, as well as an innate immunity-related pathway, suggesting a mutual compensatory interaction between HSF-1 and these conserved stress response systems. A similar compensatory molecular network is likely to also operate in higher animal taxa, raising the possibility of an unexpected outcome when HSF-1 activity is manipulated in humans.
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Affiliation(s)
- Dániel Kovács
- Department of Genetics, ELTE Eötvös Loránd University, Budapest, Hungary
| | | | - Saqib Ahmed
- Department of Genetics, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Márton Kovács
- Department of Genetics, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Tímea Sigmond
- Department of Genetics, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Bernadette Hotzi
- Department of Genetics, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Máté Varga
- Department of Genetics, ELTE Eötvös Loránd University, Budapest, Hungary
| | | | - Umar Mohammad
- Department of Genetics, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Tibor Vellai
- Department of Genetics, ELTE Eötvös Loránd University, Budapest, Hungary
- HUN-REN-ELTE Genetics Research Group, Eötvös Loránd University, Budapest, Hungary
| | - János Barna
- Department of Genetics, ELTE Eötvös Loránd University, Budapest, Hungary
- HUN-REN-ELTE Genetics Research Group, Eötvös Loránd University, Budapest, Hungary
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8
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Hafiz Rothi M, Sarkar GC, Haddad JA, Mitchell W, Ying K, Pohl N, Sotomayor-Mena RG, Natale J, Dellacono S, Gladyshev VN, Lieberman Greer E. The 18S rRNA Methyltransferase DIMT-1 Regulates Lifespan in the Germline Later in Life. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.05.14.594211. [PMID: 38798397 PMCID: PMC11118296 DOI: 10.1101/2024.05.14.594211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
Ribosome heterogeneity has emerged as an important regulatory control feature for determining which proteins are synthesized, however, the influence of age on ribosome heterogeneity is not fully understood. Whether mRNA transcripts are selectively translated in young versus old cells and whether dysregulation of this process drives organismal aging is unknown. Here we examined the role of ribosomal RNA (rRNA) methylation in maintaining appropriate translation as organisms age. In a directed RNAi screen, we identified the 18S rRNA N6'-dimethyl adenosine (m6,2A) methyltransferase, dimt-1, as a regulator of C. elegans lifespan and stress resistance. Lifespan extension induced by dimt-1 deficiency required a functional germline and was dependent on the known regulator of protein translation, the Rag GTPase, raga-1, which links amino acid sensing to the mechanistic target of rapamycin complex (mTORC)1. Using an auxin-inducible degron tagged version of dimt-1, we demonstrate that DIMT-1 functions in the germline after mid-life to regulate lifespan. We further found that knock-down of dimt-1 leads to selective translation of transcripts important for stress resistance and lifespan regulation in the C. elegans germline in mid-life including the cytochrome P450 daf-9, which synthesizes a steroid that signals from the germline to the soma to regulate lifespan. We found that dimt-1 induced lifespan extension was dependent on the daf-9 signaling pathway. This finding reveals a new layer of proteome dysfunction, beyond protein synthesis and degradation, as an important regulator of aging. Our findings highlight a new role for ribosome heterogeneity, and specific rRNA modifications, in maintaining appropriate translation later in life to promote healthy aging.
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Affiliation(s)
- M. Hafiz Rothi
- Department of Pediatrics, HMS Initiative for RNA Medicine, Harvard Medical School, Boston MA, USA
- Division of Newborn Medicine, Boston Children’s Hospital, Boston MA, USA
| | - Gautam Chandra Sarkar
- Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA
- Department of Genetics, Washington University School of Medicine, St. Louis, MO, USA
| | - Joseph Al Haddad
- Division of Newborn Medicine, Boston Children’s Hospital, Boston MA, USA
| | - Wayne Mitchell
- Division of Genetics, Department of Medicine, Brigham & Women’s Hospital, Harvard Medical School, Boston MA 02115, USA
| | - Kejun Ying
- Department of Pediatrics, HMS Initiative for RNA Medicine, Harvard Medical School, Boston MA, USA
- Division of Newborn Medicine, Boston Children’s Hospital, Boston MA, USA
| | - Nancy Pohl
- Department of Pediatrics, HMS Initiative for RNA Medicine, Harvard Medical School, Boston MA, USA
- Division of Newborn Medicine, Boston Children’s Hospital, Boston MA, USA
| | - Roberto G. Sotomayor-Mena
- Department of Pediatrics, HMS Initiative for RNA Medicine, Harvard Medical School, Boston MA, USA
- Division of Newborn Medicine, Boston Children’s Hospital, Boston MA, USA
| | - Julia Natale
- Division of Newborn Medicine, Boston Children’s Hospital, Boston MA, USA
| | - Scarlett Dellacono
- Department of Pediatrics, HMS Initiative for RNA Medicine, Harvard Medical School, Boston MA, USA
- Division of Newborn Medicine, Boston Children’s Hospital, Boston MA, USA
| | - Vadim N. Gladyshev
- Division of Genetics, Department of Medicine, Brigham & Women’s Hospital, Harvard Medical School, Boston MA 02115, USA
| | - Eric Lieberman Greer
- Department of Pediatrics, HMS Initiative for RNA Medicine, Harvard Medical School, Boston MA, USA
- Division of Newborn Medicine, Boston Children’s Hospital, Boston MA, USA
- Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA
- Department of Genetics, Washington University School of Medicine, St. Louis, MO, USA
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9
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Hua X, Wang D. Exposure to 6-PPD Quinone at Environmentally Relevant Concentrations Inhibits Both Lifespan and Healthspan in C. elegans. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:19295-19303. [PMID: 37938123 DOI: 10.1021/acs.est.3c05325] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2023]
Abstract
N-(1,3-Dimethylbutyl)-N'-phenyl-p-phenylenediamine (6-PPD), one of the most common additives used in rubber, enters the environment due to significant emissions of tire wear particles. 6-PPD quinone (6-PPDQ) is an important derivative of 6-PPD after ozonization. With concentrations ranging from nanograms per liter to μg/L, 6-PPDQ has so far been identified in a series of water samples. Acute lethality of 6-PPDQ in coho salmon (LC50 < 1 μg/L) was lower than environmental concentrations of 6-PPDQ, highlighting the environment exposure risks of 6-PPDQ. It is becoming increasingly necessary to investigate the potential toxicity of 6-PPDQ at environmental concentrations. Here, we examined the effect of 6-PPDQ exposure on lifespan and healthspan and the underlying mechanism in Caenorhabditis elegans. Exposure to 6-PPDQ (1 and 10 μg/L) shortened the lifespan. Meanwhile, during the aging process, 6-PPDQ (0.1-10 μg/L) could decrease both pumping rate and locomotion behavior, suggesting the 6-PPDQ toxicity on healthspan. For the underlying molecular mechanism, the dysregulation in the insulin signaling pathway was linked to toxicity of 6-PPDQ on lifespan and healthspan. In the insulin signaling pathway, DAF-2 restricted the function of DAF-16 to activate downstream targets (SOD-3 and HSP-6), which in turn controlled the toxicity of 6-PPDQ on lifespan and healthspan. Additionally, in response to 6-PPDQ toxicity, insulin peptides (INS-6, INS-7, and DAF-28) could activate the corresponding receptor DAF-2. Therefore, exposure to 6-PPDQ at environmentally relevant concentrations potentially causes damage to both lifespan and healthspan by activating insulin signaling in organisms.
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Affiliation(s)
- Xin Hua
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, Medical School, Southeast University, Nanjing 210009, China
| | - Dayong Wang
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, Medical School, Southeast University, Nanjing 210009, China
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10
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The Thermal Stress Coping Network of the Nematode Caenorhabditis elegans. Int J Mol Sci 2022; 23:ijms232314907. [PMID: 36499234 PMCID: PMC9737000 DOI: 10.3390/ijms232314907] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 11/11/2022] [Accepted: 11/24/2022] [Indexed: 11/30/2022] Open
Abstract
Response to hyperthermia, highly conserved from bacteria to humans, involves transcriptional upregulation of genes involved in battling the cytotoxicity caused by misfolded and denatured proteins, with the aim of proteostasis restoration. C. elegans senses and responds to changes in growth temperature or noxious thermal stress by well-defined signaling pathways. Under adverse conditions, regulation of the heat shock response (HSR) in C. elegans is controlled by a single transcription factor, heat-shock factor 1 (HSF-1). HSR and HSF-1 in particular are proven to be central to survival under proteotoxic stress, with additional roles in normal physiological processes. For years, it was a common belief that upregulation of heat shock proteins (HSPs) by HSF-1 was the main and most important step toward thermotolerance. However, an ever-growing number of studies have shown that targets of HSF-1 involved in cytoskeletal and exoskeletal integrity preservation as well as other HSF-1 dependent and independent pathways are equally important. In this review, we follow the thermal stimulus from reception by the nematode nerve endings till the activation of cellular response programs. We analyze the different HSF-1 functions in HSR as well as all the recently discovered mechanisms that add to the knowledge of the heat stress coping network of C. elegans.
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11
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Lazaro-Pena MI, Ward ZC, Yang S, Strohm A, Merrill AK, Soto CA, Samuelson AV. HSF-1: Guardian of the Proteome Through Integration of Longevity Signals to the Proteostatic Network. FRONTIERS IN AGING 2022; 3:861686. [PMID: 35874276 PMCID: PMC9304931 DOI: 10.3389/fragi.2022.861686] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 06/13/2022] [Indexed: 12/15/2022]
Abstract
Discoveries made in the nematode Caenorhabditis elegans revealed that aging is under genetic control. Since these transformative initial studies, C. elegans has become a premier model system for aging research. Critically, the genes, pathways, and processes that have fundamental roles in organismal aging are deeply conserved throughout evolution. This conservation has led to a wealth of knowledge regarding both the processes that influence aging and the identification of molecular and cellular hallmarks that play a causative role in the physiological decline of organisms. One key feature of age-associated decline is the failure of mechanisms that maintain proper function of the proteome (proteostasis). Here we highlight components of the proteostatic network that act to maintain the proteome and how this network integrates into major longevity signaling pathways. We focus in depth on the heat shock transcription factor 1 (HSF1), the central regulator of gene expression for proteins that maintain the cytosolic and nuclear proteomes, and a key effector of longevity signals.
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Affiliation(s)
- Maria I. Lazaro-Pena
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, NY, United States
| | - Zachary C. Ward
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, NY, United States
| | - Sifan Yang
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, NY, United States
- Department of Biology, University of Rochester, Rochester, NY, United States
| | - Alexandra Strohm
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, NY, United States
- Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, United States
- Toxicology Training Program, University of Rochester Medical Center, Rochester, NY, United States
| | - Alyssa K. Merrill
- Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, United States
- Toxicology Training Program, University of Rochester Medical Center, Rochester, NY, United States
| | - Celia A. Soto
- Department of Pathology, University of Rochester Medical Center, Rochester, NY, United States
- Cell Biology of Disease Graduate Program, University of Rochester Medical Center, Rochester, NY, United States
| | - Andrew V. Samuelson
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, NY, United States
- *Correspondence: Andrew V. Samuelson,
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12
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Andersen N, Veuthey T, Blanco MG, Silbestri GF, Rayes D, De Rosa MJ. 1-Mesityl-3-(3-Sulfonatopropyl) Imidazolium Protects Against Oxidative Stress and Delays Proteotoxicity in C. elegans. Front Pharmacol 2022; 13:908696. [PMID: 35685626 PMCID: PMC9171001 DOI: 10.3389/fphar.2022.908696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 04/28/2022] [Indexed: 11/20/2022] Open
Abstract
Due to the increase in life expectancy worldwide, age-related disorders such as neurodegenerative diseases (NDs) have become more prevalent. Conventional treatments comprise drugs that only attenuate some of the symptoms, but fail to arrest or delay neuronal proteotoxicity that characterizes these diseases. Due to their diverse biological activities, imidazole rings are intensively explored as powerful scaffolds for the development of new bioactive molecules. By using C. elegans, our work aims to explore novel biological roles for these compounds. To this end, we have tested the in vivo anti-proteotoxic effects of imidazolium salts. Since NDs have been largely linked to impaired antioxidant defense mechanisms, we focused on 1-Mesityl-3-(3-sulfonatopropyl) imidazolium (MSI), one of the imidazolium salts that we identified as capable of improving iron-induced oxidative stress resistance in wild-type animals. By combining mutant and gene expression analysis we have determined that this protective effect depends on the activation of the Heat Shock Transcription Factor (HSF-1), whereas it is independent of other canonical cytoprotective molecules such as abnormal Dauer Formation-16 (DAF-16/FOXO) and Skinhead-1 (SKN-1/Nrf2). To delve deeper into the biological roles of MSI, we analyzed the impact of this compound on previously established C. elegans models of protein aggregation. We found that MSI ameliorates β-amyloid-induced paralysis in worms expressing the pathological protein involved in Alzheimer’s Disease. Moreover, this compound also delays age-related locomotion decline in other proteotoxic C. elegans models, suggesting a broad protective effect. Taken together, our results point to MSI as a promising anti-proteotoxic compound and provide proof of concept of the potential of imidazole derivatives in the development of novel therapies to retard age-related proteotoxic diseases.
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Affiliation(s)
- Natalia Andersen
- Instituto de Investigaciones Bioquímicas de Bahía Blanca (INIBIBB) CCT UNS-CONICET, Bahía Blanca, Argentina
- Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional Del Sur (UNS), Bahía Blanca, Argentina
| | - Tania Veuthey
- Instituto de Investigaciones Bioquímicas de Bahía Blanca (INIBIBB) CCT UNS-CONICET, Bahía Blanca, Argentina
- Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional Del Sur (UNS), Bahía Blanca, Argentina
| | - María Gabriela Blanco
- Instituto de Investigaciones Bioquímicas de Bahía Blanca (INIBIBB) CCT UNS-CONICET, Bahía Blanca, Argentina
- Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional Del Sur (UNS), Bahía Blanca, Argentina
| | - Gustavo Fabian Silbestri
- Departamento de Química, INQUISUR, Universidad Nacional Del Sur, UNS-CONICET, Bahía Blanca, Argentina
| | - Diego Rayes
- Instituto de Investigaciones Bioquímicas de Bahía Blanca (INIBIBB) CCT UNS-CONICET, Bahía Blanca, Argentina
- Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional Del Sur (UNS), Bahía Blanca, Argentina
- *Correspondence: Diego Rayes, ; María José De Rosa,
| | - María José De Rosa
- Instituto de Investigaciones Bioquímicas de Bahía Blanca (INIBIBB) CCT UNS-CONICET, Bahía Blanca, Argentina
- Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional Del Sur (UNS), Bahía Blanca, Argentina
- *Correspondence: Diego Rayes, ; María José De Rosa,
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13
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Dutta N, Garcia G, Higuchi-Sanabria R. Hijacking Cellular Stress Responses to Promote Lifespan. FRONTIERS IN AGING 2022; 3:860404. [PMID: 35821861 PMCID: PMC9261414 DOI: 10.3389/fragi.2022.860404] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Accepted: 02/23/2022] [Indexed: 01/21/2023]
Abstract
Organisms are constantly exposed to stress both from the external environment and internally within the cell. To maintain cellular homeostasis under different environmental and physiological conditions, cell have adapted various stress response signaling pathways, such as the heat shock response (HSR), unfolded protein responses of the mitochondria (UPRMT), and the unfolded protein response of the endoplasmic reticulum (UPRER). As cells grow older, all cellular stress responses have been shown to deteriorate, which is a major cause for the physiological consequences of aging and the development of numerous age-associated diseases. In contrast, elevated stress responses are often associated with lifespan extension and amelioration of degenerative diseases in different model organisms, including C. elegans. Activating cellular stress response pathways could be considered as an effective intervention to alleviate the burden of aging by restoring function of essential damage-clearing machinery, including the ubiquitin-proteosome system, chaperones, and autophagy. Here, we provide an overview of newly emerging concepts of these stress response pathways in healthy aging and longevity with a focus on the model organism, C. elegans.
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14
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Das S, Min S, Prahlad V. Gene bookmarking by the heat shock transcription factor programs the insulin-like signaling pathway. Mol Cell 2021; 81:4843-4860.e8. [PMID: 34648748 PMCID: PMC8642288 DOI: 10.1016/j.molcel.2021.09.022] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 08/09/2021] [Accepted: 09/17/2021] [Indexed: 12/13/2022]
Abstract
Maternal stress can have long-lasting epigenetic effects on offspring. To examine how epigenetic changes are triggered by stress, we examined the effects of activating the universal stress-responsive heat shock transcription factor HSF-1 in the germline of Caenorhabditis elegans. We show that, when activated in germ cells, HSF-1 recruits MET-2, the putative histone 3 lysine 9 (H3K9) methyltransferase responsible for repressive H3K9me2 (H3K9 dimethyl) marks in chromatin, and negatively bookmarks the insulin receptor daf-2 and other HSF-1 target genes. Increased H3K9me2 at these genes persists in adult progeny and shifts their stress response strategy away from inducible chaperone expression as a mechanism to survive stress and instead rely on decreased insulin/insulin growth factor (IGF-1)-like signaling (IIS). Depending on the duration of maternal heat stress exposure, this epigenetic memory is inherited by the next generation. Thus, paradoxically, HSF-1 recruits the germline machinery normally responsible for erasing transcriptional memory but, instead, establishes a heritable epigenetic memory of prior stress exposure.
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Affiliation(s)
- Srijit Das
- Department of Biology, Aging Mind and Brain Initiative, 143 Biology Building, Iowa City, IA 52242-1324, USA
| | - Sehee Min
- Department of Biology, Aging Mind and Brain Initiative, 143 Biology Building, Iowa City, IA 52242-1324, USA
| | - Veena Prahlad
- Department of Biology, Aging Mind and Brain Initiative, 143 Biology Building, Iowa City, IA 52242-1324, USA; Department of Biology, 143 Biology Building, Iowa City, IA 52242-1324, USA; Iowa Neuroscience Institute, 169 Newton Road, 2312 Pappajohn Biomedical Discovery Building, Iowa City, IA 52242, USA.
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15
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Biglou SG, Bendena WG, Chin-Sang I. An overview of the insulin signaling pathway in model organisms Drosophila melanogaster and Caenorhabditis elegans. Peptides 2021; 145:170640. [PMID: 34450203 DOI: 10.1016/j.peptides.2021.170640] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 08/01/2021] [Accepted: 08/20/2021] [Indexed: 12/12/2022]
Abstract
The insulin/insulin-like growth factor signaling pathway is an evolutionary conserved pathway across metazoans and is required for development, metabolism and behavior. This pathway is associated with various human metabolic disorders and cancers. Thus, model organisms including Drosophila melanogaster and Caenorhabditis elegans provide excellent opportunities to examine the structure and function of this pathway and its influence on cellular metabolism and proliferation. In this review, we will provide an overview of human insulin and the human insulin signaling pathway and explore the recent discoveries in model organisms Drosophila melanogaster and Caenorhabditis elegans. Our review will provide information regarding the various insulin-like peptides in model organisms as well as the conserved functions of insulin signaling pathways. Further investigation of the insulin signaling pathway in model organisms could provide a promising opportunity to develop novel therapies for various metabolic disorders and insulin-mediated cancers.
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Affiliation(s)
- Sanaz G Biglou
- Department of Biology, Queen's University Kingston, ON, K7L3N6, Canada
| | - William G Bendena
- Department of Biology, Queen's University Kingston, ON, K7L3N6, Canada; Centre for Neuroscience, Queen's University, Kingston, ON, K7L3N6, Canada.
| | - Ian Chin-Sang
- Department of Biology, Queen's University Kingston, ON, K7L3N6, Canada
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16
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Luo A, Jing H, Yuan L, Wang Y, Xiao H, Zheng Q. Loss of Function of Scavenger Receptor SCAV-5 Protects C. elegans Against Pathogenic Bacteria. Front Cell Infect Microbiol 2021; 11:593745. [PMID: 34414127 PMCID: PMC8370389 DOI: 10.3389/fcimb.2021.593745] [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: 10/09/2020] [Accepted: 07/08/2021] [Indexed: 11/13/2022] Open
Abstract
Scavenger receptors play a critical role in innate immunity by acting as the pattern-recognition receptors. There are six class B scavenger receptors homologs in C. elegans. However, it remains unclear whether they are required for host defense against bacterial pathogens. Here, we show that, of the six SCAV proteins, only loss of function scav-5 protect C. elegans against pathogenic bacteria S. typhimurium SL1344 and P. aeruginosa PA14 by different mechanism. scav-5 mutants are resistant to S. typhimurium SL1344 due to dietary restriction. While scav-5 acts upstream of or in parallel to tir-1 in conserved PMK-1 p38 MAPK pathway to upregulate the innate immune response to defend worms against P. aeruginosa PA14. This is the first demonstration of a role for SCAV-5 in host defense against pathogenic bacteria. Our results provide an important basis for further elucidating the underlying molecular mechanism by which scav-5 regulates innate immune responses.
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Affiliation(s)
- Aixiao Luo
- Key Laboratory of the Ministry of Education for Medicinal Plant Resources and Natural Pharmaceutical Chemistry, National Engineering Laboratory for Resource Development of Endangered Crude Drugs in the Northwest of China, College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Huiru Jing
- Key Laboratory of the Ministry of Education for Medicinal Plant Resources and Natural Pharmaceutical Chemistry, National Engineering Laboratory for Resource Development of Endangered Crude Drugs in the Northwest of China, College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Lei Yuan
- Key Laboratory of the Ministry of Education for Medicinal Plant Resources and Natural Pharmaceutical Chemistry, National Engineering Laboratory for Resource Development of Endangered Crude Drugs in the Northwest of China, College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Yanzhe Wang
- Key Laboratory of the Ministry of Education for Medicinal Plant Resources and Natural Pharmaceutical Chemistry, National Engineering Laboratory for Resource Development of Endangered Crude Drugs in the Northwest of China, College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Hui Xiao
- Key Laboratory of the Ministry of Education for Medicinal Plant Resources and Natural Pharmaceutical Chemistry, National Engineering Laboratory for Resource Development of Endangered Crude Drugs in the Northwest of China, College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Qian Zheng
- Key Laboratory of the Ministry of Education for Medicinal Plant Resources and Natural Pharmaceutical Chemistry, National Engineering Laboratory for Resource Development of Endangered Crude Drugs in the Northwest of China, College of Life Sciences, Shaanxi Normal University, Xi'an, China
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17
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Derisbourg MJ, Wester LE, Baddi R, Denzel MS. Mutagenesis screen uncovers lifespan extension through integrated stress response inhibition without reduced mRNA translation. Nat Commun 2021; 12:1678. [PMID: 33723245 PMCID: PMC7960713 DOI: 10.1038/s41467-021-21743-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 01/29/2021] [Indexed: 12/12/2022] Open
Abstract
Protein homeostasis is modulated by stress response pathways and its deficiency is a hallmark of aging. The integrated stress response (ISR) is a conserved stress-signaling pathway that tunes mRNA translation via phosphorylation of the translation initiation factor eIF2. ISR activation and translation initiation are finely balanced by eIF2 kinases and by the eIF2 guanine nucleotide exchange factor eIF2B. However, the role of the ISR during aging remains poorly understood. Using a genomic mutagenesis screen for longevity in Caenorhabditis elegans, we define a role of eIF2 modulation in aging. By inhibiting the ISR, dominant mutations in eIF2B enhance protein homeostasis and increase lifespan. Consistently, full ISR inhibition using phosphorylation-defective eIF2α or pharmacological ISR inhibition prolong lifespan. Lifespan extension through impeding the ISR occurs without a reduction in overall protein synthesis. Instead, we observe changes in the translational efficiency of a subset of mRNAs, of which the putative kinase kin-35 is required for lifespan extension. Evidently, lifespan is limited by the ISR and its inhibition may provide an intervention in aging.
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Affiliation(s)
| | - Laura E Wester
- Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Ruth Baddi
- Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Martin S Denzel
- Max Planck Institute for Biology of Ageing, Cologne, Germany.
- CECAD - Cluster of Excellence, University of Cologne, Cologne, Germany.
- Center for Molecular Medicine Cologne (CMMC), University of Cologne, Cologne, Germany.
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18
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Hwang HY, Dankovich L, Wang J. Thermotolerance of tax-2 Is Uncoupled From Life Span Extension and Influenced by Temperature During Development in C. elegans. Front Genet 2020; 11:566948. [PMID: 33133151 PMCID: PMC7573314 DOI: 10.3389/fgene.2020.566948] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 09/04/2020] [Indexed: 11/13/2022] Open
Abstract
Thermotolerance of an organism is a complex trait that is influenced by a multitude of genetic and environmental factors. Many factors controlling thermotolerance in Caenorhabditis elegans are known to extend life. To understand the regulation of thermotolerance, we performed a genetic screen for mutants with better survival at warm temperature. Here we identified by dauer survival a tax-2 mutation and several mutations disrupting an insulin signaling pathway including the daf-2 gene. While the tax-2 mutant has improved thermotolerance and long life span, the newly identified daf-2 and other insulin signaling mutants, unlike the canonical daf-2(e1370), do not show improved thermotolerance despite being long-lived. Examination of tax-2 mutations and their mutant phenotypes suggest that the control of thermotolerance is not coupled with the control of life span or dauer survival. With genetic interaction studies, we concluded that tax-2 has complex roles in life span and dauer survival and that tax-2 is a negative regulator of thermotolerance independent of other known thermotolerance genes including those in the insulin signaling pathway. Moreover, cold growth temperature during development weakens the improved thermotolerance associated with tax-2 and other thermotolerance-inducing mutations. Together, this study reveals previously unknown genetic and environmental factors controlling thermotolerance and their complex relationship with life span regulation.
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Affiliation(s)
- Ho-Yon Hwang
- Department of Biochemistry and Molecular Biology, Johns Hopkins University, Baltimore, MD, United States
- Department of Neuroscience, Johns Hopkins University, Baltimore, MD, United States
| | - Laura Dankovich
- Department of Biochemistry and Molecular Biology, Johns Hopkins University, Baltimore, MD, United States
- Department of Neuroscience, Johns Hopkins University, Baltimore, MD, United States
| | - Jiou Wang
- Department of Biochemistry and Molecular Biology, Johns Hopkins University, Baltimore, MD, United States
- Department of Neuroscience, Johns Hopkins University, Baltimore, MD, United States
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19
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Lan J, Rollins JA, Zang X, Wu D, Zou L, Wang Z, Ye C, Wu Z, Kapahi P, Rogers AN, Chen D. Translational Regulation of Non-autonomous Mitochondrial Stress Response Promotes Longevity. Cell Rep 2020; 28:1050-1062.e6. [PMID: 31340143 PMCID: PMC6684276 DOI: 10.1016/j.celrep.2019.06.078] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 06/04/2019] [Accepted: 06/21/2019] [Indexed: 01/12/2023] Open
Abstract
Reduced mRNA translation delays aging, but the underlying mechanisms remain underexplored. Mutations in both DAF-2 (IGF-1 receptor) and RSKS-1 (ribosomal S6 kinase/S6K) cause synergistic lifespan extension in C. elegans. To understand the roles of translational regulation in this process, we performed polysomal profiling and identified translationally regulated ribosomal and cytochrome c (CYC-2.1) genes as key mediators of longevity. cyc-2.1 knockdown significantly extends lifespan by activating the intestinal mitochondrial unfolded protein response (UPRmt), mitochondrial fission, and AMP-activated kinase (AMPK). The germline serves as the key tissue for cyc-2.1 to regulate lifespan, and germline-specific cyc-2.1 knockdown non-autonomously activates intestinal UPRmt and AMPK. Furthermore, the RNA-binding protein GLD-1-mediated translational repression of cyc-2.1 in the germline is important for the non-autonomous activation of UPRmt and synergistic longevity of the daf-2 rsks-1 mutant. Altogether, these results illustrate a translationally regulated non-autonomous mitochondrial stress response mechanism in the modulation of lifespan by insulin-like signaling and S6K. To understand how reduced translation delays aging, Lan et al. perform translational profiling in C. elegans and propose that, in the significantly long-lived daf-2 rsks-1 mutant, serial translational regulation leads to reduced cytochrome c in the germline, which non-autonomously activates UPRmt and AMPK in the metabolic tissue to ensure longevity.
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Affiliation(s)
- Jianfeng Lan
- State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center, Institute for Brain Sciences, Nanjing University, 12 Xuefu Rd, Pukou, Nanjing, Jiangsu 210061, China
| | - Jarod A Rollins
- MDI Biological Laboratory, 159 Old Bar Harbor Rd., Salisbury Cove, ME 04672, USA
| | - Xiao Zang
- State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center, Institute for Brain Sciences, Nanjing University, 12 Xuefu Rd, Pukou, Nanjing, Jiangsu 210061, China
| | - Di Wu
- State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center, Institute for Brain Sciences, Nanjing University, 12 Xuefu Rd, Pukou, Nanjing, Jiangsu 210061, China
| | - Lina Zou
- State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center, Institute for Brain Sciences, Nanjing University, 12 Xuefu Rd, Pukou, Nanjing, Jiangsu 210061, China
| | - Zi Wang
- State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center, Institute for Brain Sciences, Nanjing University, 12 Xuefu Rd, Pukou, Nanjing, Jiangsu 210061, China
| | - Chang Ye
- State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center, Institute for Brain Sciences, Nanjing University, 12 Xuefu Rd, Pukou, Nanjing, Jiangsu 210061, China
| | - Zixing Wu
- State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center, Institute for Brain Sciences, Nanjing University, 12 Xuefu Rd, Pukou, Nanjing, Jiangsu 210061, China
| | - Pankaj Kapahi
- Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945, USA.
| | - Aric N Rogers
- MDI Biological Laboratory, 159 Old Bar Harbor Rd., Salisbury Cove, ME 04672, USA.
| | - Di Chen
- State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center, Institute for Brain Sciences, Nanjing University, 12 Xuefu Rd, Pukou, Nanjing, Jiangsu 210061, China.
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20
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Jenkins NL, James SA, Salim A, Sumardy F, Speed TP, Conrad M, Richardson DR, Bush AI, McColl G. Changes in ferrous iron and glutathione promote ferroptosis and frailty in aging Caenorhabditis elegans. eLife 2020; 9:e56580. [PMID: 32690135 PMCID: PMC7373428 DOI: 10.7554/elife.56580] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Accepted: 07/06/2020] [Indexed: 12/16/2022] Open
Abstract
All eukaryotes require iron. Replication, detoxification, and a cancer-protective form of regulated cell death termed ferroptosis, all depend on iron metabolism. Ferrous iron accumulates over adult lifetime in Caenorhabditis elegans. Here, we show that glutathione depletion is coupled to ferrous iron elevation in these animals, and that both occur in late life to prime cells for ferroptosis. We demonstrate that blocking ferroptosis, either by inhibition of lipid peroxidation or by limiting iron retention, mitigates age-related cell death and markedly increases lifespan and healthspan. Temporal scaling of lifespan is not evident when ferroptosis is inhibited, consistent with this cell death process acting at specific life phases to induce organismal frailty, rather than contributing to a constant aging rate. Because excess age-related iron elevation in somatic tissue, particularly in brain, is thought to contribute to degenerative disease, post-developmental interventions to limit ferroptosis may promote healthy aging.
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Affiliation(s)
- Nicole L Jenkins
- Melbourne Dementia Research Centre, Florey Institute of Neuroscience and Mental Health and University of MelbourneParkvilleAustralia
| | | | - Agus Salim
- Department of Mathematics and Statistics, La Trobe UniversityBundooraAustralia
- Bioinformatics Division, Walter and Eliza Hall Institute of Medical ResearchParkvilleAustralia
- Melbourne School of Population and Global Health, and School of Mathematics and Statistics, University of MelbourneMelbourneAustralia
| | - Fransisca Sumardy
- Melbourne Dementia Research Centre, Florey Institute of Neuroscience and Mental Health and University of MelbourneParkvilleAustralia
| | - Terence P Speed
- Bioinformatics Division, Walter and Eliza Hall Institute of Medical ResearchParkvilleAustralia
- Department of Mathematics and Statistics, University of MelbourneMelbourneAustralia
| | - Marcus Conrad
- Helmholtz Zentrum München, Institute of Metabolism and Cell DeathNeuherbergGermany
| | - Des R Richardson
- Department of Pathology and Bosch Institute, University of SydneySydneyAustralia
| | - Ashley I Bush
- Melbourne Dementia Research Centre, Florey Institute of Neuroscience and Mental Health and University of MelbourneParkvilleAustralia
| | - Gawain McColl
- Melbourne Dementia Research Centre, Florey Institute of Neuroscience and Mental Health and University of MelbourneParkvilleAustralia
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21
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HSPA1A Protects Cells from Thermal Stress by Impeding ESCRT-0-Mediated Autophagic Flux in Epidermal Thermoresistance. J Invest Dermatol 2020; 141:48-58.e3. [PMID: 32533962 DOI: 10.1016/j.jid.2020.05.105] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Revised: 05/19/2020] [Accepted: 05/19/2020] [Indexed: 01/30/2023]
Abstract
Thermoresistance is a physiological phenomenon relevant to noninvasive laser treatments for skin esthetics and tumor removal, although the underlying mechanism remains elusive. We hypothesized that HSPA1A may regulate autophagy by reducing ESCRT-0 and/or STAM2 levels, which could lead to thermal protection from cell death. In this study, we showed that thermoresistance was induced in mouse epidermal tissue and HaCaT cells by heating at 45 °C for 10 minutes. Moreover, HSPA1A levels were increased in thermoresistant mouse epidermis and HaCaT cells. HSPA1A was highly involved in protecting cells from thermal cytotoxicity, as evidenced by the knockdown or overexpression assays of the HSPA1A gene. In addition, ESCRT-0 and STAM2 levels were dramatically decreased in thermoresistant cells, which was mediated by HSPA1A binding to STAM2, particularly through HSPA1A amino acids 395‒509. Furthermore, the loss of ESCRT-0 and/or STAM2 in response to HSPA1A-STAM2 binding regulated autophagy by impeding autophagosome‒lysosome fusion and abolishing autophagic flux in cellular thermoresistance, significantly reducing thermal cytotoxicity and promoting cell survival. To our knowledge, it is previously unreported that HSPA1A-ESCRT-0 and/or STAM2 modulates heat-induced resistance by inhibiting autophagic flux. In summary, the results of this study demonstrate that the mechanisms of thermoresistance may have clinical relevance for noninvasive or minimally invasive thermal therapeutics.
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Wang S, You M, Wang C, Zhang Y, Fan C, Yan S. Heat shock pretreatment induced cadmium resistance in the nematode Caenorhabditis elegans is depend on transcription factors DAF-16 and HSF-1. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 261:114081. [PMID: 32062098 DOI: 10.1016/j.envpol.2020.114081] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 01/24/2020] [Accepted: 01/26/2020] [Indexed: 06/10/2023]
Abstract
Cadmium (Cd) exposure poses a serious environmental problem due to the metal's bioaccumulation and difficult to eliminate from body. Understanding the mechanisms of Cd detoxification and resistance can provide insights into methods to protect against the damaging effects of the heavy metal. In the present study, we found that heat shock (HS) pretreatment increased Cd resistance of the nematode Caenorhabditis elegans by reducing the bagging phenotype and protecting the integrity of the intestinal barrier. HS pretreatment increased the expression of heat shock protein-16.2 (HSP-16.2) prior to Cd exposure, and HS-induced Cd resistance was absent in worms with hsp-16.2 loss-of-function mutation. Worm strain with daf-2(e1370) mutation presented enhanced HS-induced Cd resistance, which was eliminated in worm strains of daf-16(mu86) and hsf-1(sy441). HS pretreatment increased DAF-16 nuclear localization and HSF-1 granule formation prior to Cd exposure. DAF-16 and HSF-1 was essential in reducing bagging formation and protecting the integrity of intestinal barrier after HS pretreatment. In conclusion, the present study demonstrated that HS-induced Cd resistance in C. elegans is regulated by the DAF-16/FOXO and HSF-1 pathways through regulation of HSP-16.2 expression.
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Affiliation(s)
- Shunchang Wang
- School of Bioengineering, Huainan Normal University, Huainan, 232038, China; Key Laboratory of Bioresource and Environmental Biotechnology of Anhui Higher Education Institutes, Huainan Normal University, Huainan, 232038, China.
| | - Mu You
- School of Bioengineering, Huainan Normal University, Huainan, 232038, China; Key Laboratory of Bioresource and Environmental Biotechnology of Anhui Higher Education Institutes, Huainan Normal University, Huainan, 232038, China
| | - Chengrun Wang
- School of Bioengineering, Huainan Normal University, Huainan, 232038, China; Key Laboratory of Bioresource and Environmental Biotechnology of Anhui Higher Education Institutes, Huainan Normal University, Huainan, 232038, China
| | - Yuecheng Zhang
- School of Bioengineering, Huainan Normal University, Huainan, 232038, China
| | - Caiqi Fan
- School of Bioengineering, Huainan Normal University, Huainan, 232038, China
| | - Shoubao Yan
- School of Bioengineering, Huainan Normal University, Huainan, 232038, China; Key Laboratory of Bioresource and Environmental Biotechnology of Anhui Higher Education Institutes, Huainan Normal University, Huainan, 232038, China
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Liberman N, O’Brown ZK, Earl AS, Boulias K, Gerashchenko MV, Wang SY, Fritsche C, Fady PE, Dong A, Gladyshev VN, Greer EL. N6-adenosine methylation of ribosomal RNA affects lipid oxidation and stress resistance. SCIENCE ADVANCES 2020; 6:eaaz4370. [PMID: 32494643 PMCID: PMC7176415 DOI: 10.1126/sciadv.aaz4370] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 01/27/2020] [Indexed: 05/26/2023]
Abstract
During stress, global translation is reduced, but specific transcripts are actively translated. How stress-responsive mRNAs are selectively translated is unknown. We show that METL-5 methylates adenosine 1717 on 18S ribosomal RNA in C. elegans, enhancing selective ribosomal binding and translation of specific mRNAs. One of these mRNAs, CYP-29A3, oxidizes the omega-3 polyunsaturated fatty acid eicosapentaenoic acid to eicosanoids, key stress signaling molecules. While metl-5-deficient animals grow normally under homeostatic conditions, they are resistant to a variety of stresses. metl-5 mutant worms also show reduced bioactive lipid eicosanoids and dietary supplementation of eicosanoid products of CYP-29A3 restores stress sensitivity of metl-5 mutant worms. Thus, methylation of a specific residue of 18S rRNA by METL-5 selectively enhances translation of cyp-29A3 to increase production of eicosanoids, and blocking this pathway increases stress resistance. This study suggests that ribosome methylation can facilitate selective translation, providing another layer of regulation of the stress response.
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Affiliation(s)
- Noa Liberman
- Division of Newborn Medicine, Boston Children’s Hospital, 300 Longwood Avenue, Boston, MA 02115, USA
- Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA
| | - Zach K. O’Brown
- Division of Newborn Medicine, Boston Children’s Hospital, 300 Longwood Avenue, Boston, MA 02115, USA
- Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA
| | - Andrew Scott Earl
- Division of Newborn Medicine, Boston Children’s Hospital, 300 Longwood Avenue, Boston, MA 02115, USA
- Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA
| | - Konstantinos Boulias
- Division of Newborn Medicine, Boston Children’s Hospital, 300 Longwood Avenue, Boston, MA 02115, USA
- Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA
| | - Maxim V. Gerashchenko
- Division of Genetics, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Simon Yuan Wang
- Division of Newborn Medicine, Boston Children’s Hospital, 300 Longwood Avenue, Boston, MA 02115, USA
- Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA
| | - Colette Fritsche
- Division of Newborn Medicine, Boston Children’s Hospital, 300 Longwood Avenue, Boston, MA 02115, USA
| | - Paul-Enguerrand Fady
- Division of Newborn Medicine, Boston Children’s Hospital, 300 Longwood Avenue, Boston, MA 02115, USA
| | - Anna Dong
- Division of Newborn Medicine, Boston Children’s Hospital, 300 Longwood Avenue, Boston, MA 02115, USA
| | - Vadim N. Gladyshev
- Division of Genetics, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Eric Lieberman Greer
- Division of Newborn Medicine, Boston Children’s Hospital, 300 Longwood Avenue, Boston, MA 02115, USA
- Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA
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The heat shock transcription factor HSF-1 protects Caenorhabditis elegans from peroxide stress. TRANSLATIONAL MEDICINE OF AGING 2020. [DOI: 10.1016/j.tma.2020.07.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Kumar S, Egan BM, Kocsisova Z, Schneider DL, Murphy JT, Diwan A, Kornfeld K. Lifespan Extension in C. elegans Caused by Bacterial Colonization of the Intestine and Subsequent Activation of an Innate Immune Response. Dev Cell 2019; 49:100-117.e6. [PMID: 30965033 DOI: 10.1016/j.devcel.2019.03.010] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 02/04/2019] [Accepted: 03/12/2019] [Indexed: 10/27/2022]
Abstract
Mechanisms that control aging are important yet poorly defined. To discover longevity control genes, we performed a forward genetic screen for delayed reproductive aging in C. elegans. Here, we show that am117 is a nonsense mutation in the phm-2 gene, which encodes a protein homologous to human scaffold attachment factor B. phm-2(lf) mutant worms have an abnormal pharynx grinder, which allows live bacteria to accumulate in the intestine. This defect shortens lifespan on highly pathogenic bacteria but extends lifespan and health span on the standard E. coli diet by activating innate immunity pathways that lead to bacterial avoidance behavior and dietary restriction. eat-2(lf) mutants displayed a similar phenotype, indicating accumulation of live bacteria also triggers extended longevity in this mutant. The analysis of phm-2 elucidates connections between pathogen response and aging by defining a mechanism of longevity extension in C. elegans-bacterial colonization, innate immune activation, and bacterial avoidance behavior.
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Affiliation(s)
- Sandeep Kumar
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO 63110, USA; Division of Bone & Mineral Diseases, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Brian M Egan
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Zuzana Kocsisova
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Daniel L Schneider
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - John T Murphy
- Center for Cardiovascular Research and Division of Cardiology, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Abhinav Diwan
- Center for Cardiovascular Research and Division of Cardiology, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Kerry Kornfeld
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO 63110, USA.
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Rollins JA, Shaffer D, Snow SS, Kapahi P, Rogers AN. Dietary restriction induces posttranscriptional regulation of longevity genes. Life Sci Alliance 2019; 2:2/4/e201800281. [PMID: 31253655 PMCID: PMC6600014 DOI: 10.26508/lsa.201800281] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2018] [Revised: 06/19/2019] [Accepted: 06/20/2019] [Indexed: 12/12/2022] Open
Abstract
Dietary restriction (DR) increases life span through adaptive changes in gene expression. To understand more about these changes, we analyzed the transcriptome and translatome of Caenorhabditis elegans subjected to DR. Transcription of muscle regulatory and structural genes increased, whereas increased expression of amino acid metabolism and neuropeptide signaling genes was controlled at the level of translation. Evaluation of posttranscriptional regulation identified putative roles for RNA-binding proteins, RNA editing, miRNA, alternative splicing, and nonsense-mediated decay in response to nutrient limitation. Using RNA interference, we discovered several differentially expressed genes that regulate life span. We also found a compensatory role for translational regulation, which offsets dampened expression of a large subset of transcriptionally down-regulated genes. Furthermore, 3' UTR editing and intron retention increase under DR and correlate with diminished translation, whereas trans-spliced genes are refractory to reduced translation efficiency compared with messages with the native 5' UTR. Finally, we find that smg-6 and smg-7, which are genes governing selection and turnover of nonsense-mediated decay targets, are required for increased life span under DR.
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Affiliation(s)
- Jarod A Rollins
- Mount Desert Island Biological Laboratory, Salisbury Cove, ME, USA
| | - Dan Shaffer
- Mount Desert Island Biological Laboratory, Salisbury Cove, ME, USA
| | - Santina S Snow
- Mount Desert Island Biological Laboratory, Salisbury Cove, ME, USA
| | - Pankaj Kapahi
- Buck Institute for Research on Aging, Novato, CA, USA
| | - Aric N Rogers
- Mount Desert Island Biological Laboratory, Salisbury Cove, ME, USA
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Kaplan REW, Webster AK, Chitrakar R, Dent JA, Baugh LR. Food perception without ingestion leads to metabolic changes and irreversible developmental arrest in C. elegans. BMC Biol 2018; 16:112. [PMID: 30296941 PMCID: PMC6176503 DOI: 10.1186/s12915-018-0579-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 09/24/2018] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Developmental physiology is very sensitive to nutrient availability. For instance, in the nematode Caenorhabditis elegans, newly hatched L1-stage larvae require food to initiate postembryonic development. In addition, larvae arrested in the dauer diapause, a non-feeding state of developmental arrest that occurs during the L3 stage, initiate recovery when exposed to food. Despite the essential role of food in C. elegans development, the contribution of food perception versus ingestion on physiology has not been delineated. RESULTS We used a pharmacological approach to uncouple the effects of food (bacteria) perception and ingestion in C. elegans. Perception was not sufficient to promote postembryonic development in L1-stage larvae. However, L1 larvae exposed to food without ingestion failed to develop upon return to normal culture conditions, instead displaying an irreversible arrest phenotype. Inhibition of gene expression during perception rescued subsequent development, demonstrating that the response to perception without feeding is deleterious. Perception altered DAF-16/FOXO subcellular localization, reflecting activation of insulin/IGF signaling (IIS). The insulin-like peptide daf-28 was specifically required, suggesting perception in chemosensory neurons, where it is expressed, regulates peptide synthesis and possibly secretion. However, genetic manipulation of IIS did not modify the irreversible arrest phenotype caused by food perception, revealing that wild-type function of the IIS pathway is not required to produce this phenotype and that other pathways affected by perception of food in the absence of its ingestion are likely to be involved. Gene expression and Nile red staining showed that food perception could alter lipid metabolism and storage. We found that starved larvae sense environmental polypeptides, with similar molecular and developmental effects as perception of bacteria. Environmental polypeptides also promoted recovery from dauer diapause, suggesting that perception of polypeptides plays an important role in the life history of free-living nematodes. CONCLUSIONS We conclude that actual ingestion of food is required to initiate postembryonic development in C. elegans. We also conclude that polypeptides are perceived as a food-associated cue in this and likely other animals, initiating a signaling and gene regulatory cascade that alters metabolism in anticipation of feeding and development, but that this response is detrimental if feeding does not occur.
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Affiliation(s)
- Rebecca E W Kaplan
- Department of Biology, Duke University, Box 90338, Durham, NC, 27708-0338, USA
| | - Amy K Webster
- Department of Biology, Duke University, Box 90338, Durham, NC, 27708-0338, USA
| | - Rojin Chitrakar
- Department of Biology, Duke University, Box 90338, Durham, NC, 27708-0338, USA
| | - Joseph A Dent
- Department of Biology, McGill University, Montreal, QC, H3A 1B1, Canada
| | - L Ryan Baugh
- Department of Biology, Duke University, Box 90338, Durham, NC, 27708-0338, USA.
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28
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Denzel MS, Lapierre LR, Mack HID. Emerging topics in C. elegans aging research: Transcriptional regulation, stress response and epigenetics. Mech Ageing Dev 2018; 177:4-21. [PMID: 30134144 PMCID: PMC6696993 DOI: 10.1016/j.mad.2018.08.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Revised: 08/09/2018] [Accepted: 08/10/2018] [Indexed: 12/13/2022]
Abstract
Key discoveries in aging research have been made possible with the use of model organisms. Caenorhabditis elegans is a short-lived nematode that has become a well-established system to study aging. The practicality and powerful genetic manipulations associated with this metazoan have revolutionized our ability to understand how organisms age. 25 years after the publication of the discovery of the daf-2 gene as a genetic modifier of lifespan, C. elegans remains as relevant as ever in the quest to understand the process of aging. Nematode aging research has proven useful in identifying transcriptional regulators, small molecule signals, cellular mechanisms, epigenetic modifications associated with stress resistance and longevity, and lifespan-extending compounds. Here, we review recent discoveries and selected topics that have emerged in aging research using this incredible little worm.
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Affiliation(s)
- Martin S Denzel
- Max Planck Institute for Biology of Ageing, Cologne, Germany.
| | - Louis R Lapierre
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI, USA.
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29
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Hansen M, Rubinsztein DC, Walker DW. Autophagy as a promoter of longevity: insights from model organisms. Nat Rev Mol Cell Biol 2018; 19:579-593. [PMID: 30006559 DOI: 10.1038/s41580-018-0033-y] [Citation(s) in RCA: 463] [Impact Index Per Article: 77.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Autophagy is a conserved process that catabolizes intracellular components to maintain energy homeostasis and to protect cells against stress. Autophagy has crucial roles during development and disease, and evidence accumulated over the past decade indicates that autophagy also has a direct role in modulating ageing. In particular, elegant studies using yeasts, worms, flies and mice have demonstrated a broad requirement for autophagy-related genes in the lifespan extension observed in a number of conserved longevity paradigms. Moreover, several new and interesting concepts relevant to autophagy and its role in modulating longevity have emerged. First, select tissues may require or benefit from autophagy activation in longevity paradigms, as tissue-specific overexpression of single autophagy genes is sufficient to extend lifespan. Second, selective types of autophagy may be crucial for longevity by specifically targeting dysfunctional cellular components and preventing their accumulation. And third, autophagy can influence organismal health and ageing even non-cell autonomously, and thus, autophagy stimulation in select tissues can have beneficial, systemic effects on lifespan. Understanding these mechanisms will be important for the development of approaches to improve human healthspan that are based on the modulation of autophagy.
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Affiliation(s)
- Malene Hansen
- Sanford Burnham Prebys Medical Discovery Institute, Program of Development, Aging and Regeneration, La Jolla, CA, USA.
| | - David C Rubinsztein
- Cambridge Institute for Medical Research, Department of Medical Genetics, Cambridge, UK. .,UK Dementia Research Institute, University of Cambridge, Cambridge, UK.
| | - David W Walker
- Department of Integrative Biology and Physiology, University of California, Los Angeles, CA, USA. .,Molecular Biology Institute, University of California, Los Angeles, CA, USA.
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Higuchi-Sanabria R, Frankino PA, Paul JW, Tronnes SU, Dillin A. A Futile Battle? Protein Quality Control and the Stress of Aging. Dev Cell 2018; 44:139-163. [PMID: 29401418 PMCID: PMC5896312 DOI: 10.1016/j.devcel.2017.12.020] [Citation(s) in RCA: 92] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 11/30/2017] [Accepted: 12/20/2017] [Indexed: 12/15/2022]
Abstract
There exists a phenomenon in aging research whereby early life stress can have positive impacts on longevity. The mechanisms underlying these observations suggest a robust, long-lasting induction of cellular defense mechanisms. These include the various unfolded protein responses of the endoplasmic reticulum (ER), cytosol, and mitochondria. Indeed, ectopic induction of these pathways, in the absence of stress, is sufficient to increase lifespan in organisms as diverse as yeast, worms, and flies. Here, we provide an overview of the protein quality control mechanisms that operate in the cytosol, mitochondria, and ER and discuss how they affect cellular health and viability during stress and aging.
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Affiliation(s)
- Ryo Higuchi-Sanabria
- Department of Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Phillip Andrew Frankino
- Department of Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Joseph West Paul
- Department of Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Sarah Uhlein Tronnes
- Department of Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Andrew Dillin
- Department of Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA; The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720, USA.
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31
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Dues DJ, Andrews EK, Schaar CE, Bergsma AL, Senchuk MM, Van Raamsdonk JM. Aging causes decreased resistance to multiple stresses and a failure to activate specific stress response pathways. Aging (Albany NY) 2017; 8:777-95. [PMID: 27053445 PMCID: PMC4925828 DOI: 10.18632/aging.100939] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 03/17/2016] [Indexed: 12/14/2022]
Abstract
In this work, we examine the relationship between stress resistance and aging. We find that resistance to multiple types of stress peaks during early adulthood and then declines with age. To dissect the underlying mechanisms, we use C. elegans transcriptional reporter strains that measure the activation of different stress responses including: the heat shock response, mitochondrial unfolded protein response, endoplasmic reticulum unfolded protein response, hypoxia response, SKN-1-mediated oxidative stress response, and the DAF-16-mediated stress response. We find that the decline in stress resistance with age is at least partially due to a decreased ability to activate protective mechanisms in response to stress. In contrast, we find that any baseline increase in stress caused by the advancing age is too mild to detectably upregulate any of the stress response pathways. Further exploration of how worms respond to stress with increasing age revealed that the ability to mount a hormetic response to heat stress is also lost with increasing age. Overall, this work demonstrates that resistance to all types of stress declines with age. Based on our data, we speculate that the decrease in stress resistance with advancing age results from a genetically-programmed inactivation of stress response pathways, not accumulation of damage.
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Affiliation(s)
- Dylan J Dues
- Laboratory of Aging and Neurodegenerative Disease, Center for Neurodegenerative Science, Van Andel Research Institute, Grand Rapids, MI 49503, USA
| | - Emily K Andrews
- Laboratory of Aging and Neurodegenerative Disease, Center for Neurodegenerative Science, Van Andel Research Institute, Grand Rapids, MI 49503, USA
| | - Claire E Schaar
- Laboratory of Aging and Neurodegenerative Disease, Center for Neurodegenerative Science, Van Andel Research Institute, Grand Rapids, MI 49503, USA
| | - Alexis L Bergsma
- Laboratory of Aging and Neurodegenerative Disease, Center for Neurodegenerative Science, Van Andel Research Institute, Grand Rapids, MI 49503, USA
| | - Megan M Senchuk
- Laboratory of Aging and Neurodegenerative Disease, Center for Neurodegenerative Science, Van Andel Research Institute, Grand Rapids, MI 49503, USA
| | - Jeremy M Van Raamsdonk
- Laboratory of Aging and Neurodegenerative Disease, Center for Neurodegenerative Science, Van Andel Research Institute, Grand Rapids, MI 49503, USA.,Department of Translational Science and Molecular Medicine, Michigan State University, Grand Rapids, MI 49503, USA.,Department of Genetics, Michigan State University, East Lansing, MI 48824, USA
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Das R, Melo JA, Thondamal M, Morton EA, Cornwell AB, Crick B, Kim JH, Swartz EW, Lamitina T, Douglas PM, Samuelson AV. The homeodomain-interacting protein kinase HPK-1 preserves protein homeostasis and longevity through master regulatory control of the HSF-1 chaperone network and TORC1-restricted autophagy in Caenorhabditis elegans. PLoS Genet 2017; 13:e1007038. [PMID: 29036198 PMCID: PMC5658188 DOI: 10.1371/journal.pgen.1007038] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 10/26/2017] [Accepted: 09/20/2017] [Indexed: 12/11/2022] Open
Abstract
An extensive proteostatic network comprised of molecular chaperones and protein clearance mechanisms functions collectively to preserve the integrity and resiliency of the proteome. The efficacy of this network deteriorates during aging, coinciding with many clinical manifestations, including protein aggregation diseases of the nervous system. A decline in proteostasis can be delayed through the activation of cytoprotective transcriptional responses, which are sensitive to environmental stress and internal metabolic and physiological cues. The homeodomain-interacting protein kinase (hipk) family members are conserved transcriptional co-factors that have been implicated in both genotoxic and metabolic stress responses from yeast to mammals. We demonstrate that constitutive expression of the sole Caenorhabditis elegans Hipk homolog, hpk-1, is sufficient to delay aging, preserve proteostasis, and promote stress resistance, while loss of hpk-1 is deleterious to these phenotypes. We show that HPK-1 preserves proteostasis and extends longevity through distinct but complementary genetic pathways defined by the heat shock transcription factor (HSF-1), and the target of rapamycin complex 1 (TORC1). We demonstrate that HPK-1 antagonizes sumoylation of HSF-1, a post-translational modification associated with reduced transcriptional activity in mammals. We show that inhibition of sumoylation by RNAi enhances HSF-1-dependent transcriptional induction of chaperones in response to heat shock. We find that hpk-1 is required for HSF-1 to induce molecular chaperones after thermal stress and enhances hormetic extension of longevity. We also show that HPK-1 is required in conjunction with HSF-1 for maintenance of proteostasis in the absence of thermal stress, protecting against the formation of polyglutamine (Q35::YFP) protein aggregates and associated locomotory toxicity. These functions of HPK-1/HSF-1 undergo rapid down-regulation once animals reach reproductive maturity. We show that HPK-1 fortifies proteostasis and extends longevity by an additional independent mechanism: induction of autophagy. HPK-1 is necessary for induction of autophagosome formation and autophagy gene expression in response to dietary restriction (DR) or inactivation of TORC1. The autophagy-stimulating transcription factors pha-4/FoxA and mxl-2/Mlx, but not hlh-30/TFEB or the nuclear hormone receptor nhr-62, are necessary for extended longevity resulting from HPK-1 overexpression. HPK-1 expression is itself induced by transcriptional mechanisms after nutritional stress, and post-transcriptional mechanisms in response to thermal stress. Collectively our results position HPK-1 at a central regulatory node upstream of the greater proteostatic network, acting at the transcriptional level by promoting protein folding via chaperone expression, and protein turnover via expression of autophagy genes. HPK-1 therefore provides a promising intervention point for pharmacological agents targeting the protein homeostasis system as a means of preserving robust longevity. Aging is the gradual and progressive decline of vitality. A hallmark of aging is the decay of protective mechanisms that normally preserve the robustness and resiliency of cells and tissues. Proteostasis is the term that applies specifically to those mechanisms that promote stability of the proteome, the collection of polypeptides that cells produce, by a combination of chaperone-assisted folding and degradation of misfolded or extraneous proteins. We have identified hpk-1 (encoding a homeodomain-interacting protein kinase) in the nematode C. elegans as an important transcriptional regulatory component of the proteostasis machinery. HPK-1 promotes proteostasis by linking two distinct mechanisms: first by stimulating chaperone gene expression via the heat shock transcription factor (HSF-1), and second by stimulating autophagy gene expression in opposition to the target of rapamycin (TOR) kinase signaling pathway. HPK-1 therefore provides an attractive target for interventions to preserve physiological resiliency during aging by preserving the overall health of the proteome.
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Affiliation(s)
- Ritika Das
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, New York, United States of America
- Department of Biology, University of Rochester, Rochester, New York, United States of America
| | - Justine A. Melo
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, New York, United States of America
| | - Manjunatha Thondamal
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, New York, United States of America
| | - Elizabeth A. Morton
- Department of Genome Sciences, University of Washington, Seattle, Washington, United States of America
| | - Adam B. Cornwell
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, New York, United States of America
| | - Beresford Crick
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, New York, United States of America
| | - Joung Heon Kim
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, New York, United States of America
| | - Elliot W. Swartz
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, New York, United States of America
| | - Todd Lamitina
- Department of Cell Biology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Peter M. Douglas
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, UT Southwestern Medical Center, Dallas, Texas, United States of America
| | - Andrew V. Samuelson
- Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, New York, United States of America
- * E-mail:
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Shilovsky GA, Putyatina TS, Lysenkov SN, Ashapkin VV, Luchkina OS, Markov AV, Skulachev VP. Is It Possible to Prove the Existence of an Aging Program by Quantitative Analysis of Mortality Dynamics? BIOCHEMISTRY (MOSCOW) 2017; 81:1461-1476. [PMID: 28259123 DOI: 10.1134/s0006297916120075] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Accumulation of various types of lesions in the course of aging increases an organism's vulnerability and results in a monotonous elevation of mortality rate, irrespective of the position of a species on the evolutionary tree. Stroustrup et al. (Nature, 530, 103-107) [1] showed in 2016 that in the nematode Caenorhabditis elegans, longevity-altering factors (e.g. oxidative stress, temperature, or diet) do not change the shape of the survival curve, but either stretch or shrink it along the time axis, which the authors attributed to the existence of an "aging program". Modification of the accelerated failure time model by Stroustrup et al. uses temporal scaling as a basic approach for distinguishing between quantitative and qualitative changes in aging dynamics. Thus we analyzed data on the effects of various longevity-increasing genetic manipulations in flies, worms, and mice and used several models to choose a theory that would best fit the experimental results. The possibility to identify the moment of switch from a mortality-governing pathway to some other pathways might be useful for testing geroprotective drugs. In this work, we discuss this and other aspects of temporal scaling.
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Affiliation(s)
- G A Shilovsky
- Lomonosov Moscow State University, Belozersky Institute of Physico-Chemical Biology, Moscow, 119991, Russia.
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Seah NE, de Magalhaes Filho CD, Petrashen AP, Henderson HR, Laguer J, Gonzalez J, Dillin A, Hansen M, Lapierre LR. Autophagy-mediated longevity is modulated by lipoprotein biogenesis. Autophagy 2016; 12:261-72. [PMID: 26671266 PMCID: PMC4836030 DOI: 10.1080/15548627.2015.1127464] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Autophagy-dependent longevity models in C. elegans display altered lipid storage profiles, but the contribution of lipid distribution to life-span extension is not fully understood. Here we report that lipoprotein production, autophagy and lysosomal lipolysis are linked to modulate life span in a conserved fashion. We find that overexpression of the yolk lipoprotein VIT/vitellogenin reduces the life span of long-lived animals by impairing the induction of autophagy-related and lysosomal genes necessary for longevity. Accordingly, reducing vitellogenesis increases life span via induction of autophagy and lysosomal lipolysis. Life-span extension due to reduced vitellogenesis or enhanced lysosomal lipolysis requires nuclear hormone receptors (NHRs) NHR-49 and NHR-80, highlighting novel roles for these NHRs in lysosomal lipid signaling. In dietary-restricted worms and mice, expression of VIT and hepatic APOB (apolipoprotein B), respectively, are significantly reduced, suggesting a conserved longevity mechanism. Altogether, our study demonstrates that lipoprotein biogenesis is an important mechanism that modulates aging by impairing autophagy and lysosomal lipolysis.
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Affiliation(s)
- Nicole E Seah
- a Department of Molecular Biology , Cell Biology and Biochemistry, Brown University , Providence , RI , USA
| | - C Daniel de Magalhaes Filho
- b The Howard Hughes Medical Institute, The Glenn Center for Aging Research, The Salk Institute for Biological Studies , La Jolla , CA , USA.,c The Howard Hughes Medical Institute, Molecular and Cell Biology Department, Li Ka Shing Center, University of California Berkeley , Berkeley , CA , USA
| | - Anna P Petrashen
- a Department of Molecular Biology , Cell Biology and Biochemistry, Brown University , Providence , RI , USA
| | - Hope R Henderson
- c The Howard Hughes Medical Institute, Molecular and Cell Biology Department, Li Ka Shing Center, University of California Berkeley , Berkeley , CA , USA.,d Del E. Webb Neuroscience , Aging and Stem Cell Research Center, Program of Development and Aging, Sanford-Burnham Medical Research Institute , La Jolla , CA , USA
| | - Jade Laguer
- d Del E. Webb Neuroscience , Aging and Stem Cell Research Center, Program of Development and Aging, Sanford-Burnham Medical Research Institute , La Jolla , CA , USA
| | - Julissa Gonzalez
- d Del E. Webb Neuroscience , Aging and Stem Cell Research Center, Program of Development and Aging, Sanford-Burnham Medical Research Institute , La Jolla , CA , USA
| | - Andrew Dillin
- b The Howard Hughes Medical Institute, The Glenn Center for Aging Research, The Salk Institute for Biological Studies , La Jolla , CA , USA.,c The Howard Hughes Medical Institute, Molecular and Cell Biology Department, Li Ka Shing Center, University of California Berkeley , Berkeley , CA , USA
| | - Malene Hansen
- d Del E. Webb Neuroscience , Aging and Stem Cell Research Center, Program of Development and Aging, Sanford-Burnham Medical Research Institute , La Jolla , CA , USA
| | - Louis R Lapierre
- a Department of Molecular Biology , Cell Biology and Biochemistry, Brown University , Providence , RI , USA.,d Del E. Webb Neuroscience , Aging and Stem Cell Research Center, Program of Development and Aging, Sanford-Burnham Medical Research Institute , La Jolla , CA , USA
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Altintas O, Park S, Lee SJV. The role of insulin/IGF-1 signaling in the longevity of model invertebrates, C. elegans and D. melanogaster. BMB Rep 2016; 49:81-92. [PMID: 26698870 PMCID: PMC4915121 DOI: 10.5483/bmbrep.2016.49.2.261] [Citation(s) in RCA: 130] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Indexed: 01/08/2023] Open
Abstract
Insulin/insulin-like growth factor (IGF)-1 signaling (IIS) pathway regulates
aging in many organisms, ranging from simple invertebrates to mammals, including
humans. Many seminal discoveries regarding the roles of IIS in aging and
longevity have been made by using the roundworm Caenorhabditis
elegans and the fruit fly Drosophila melanogaster. In this
review, we describe the mechanisms by which various IIS components regulate
aging in C. elegans and D. melanogaster. We
also cover systemic and tissue-specific effects of the IIS components on the
regulation of lifespan. We further discuss IIS-mediated physiological processes
other than aging and their effects on human disease models focusing on
C. elegans studies. As both C. elegans and
D. melanogaster have been essential for key findings
regarding the effects of IIS on organismal aging in general, these invertebrate
models will continue to serve as workhorses to help our understanding of
mammalian aging. [BMB Reports 2016; 49(2): 81-92]
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Affiliation(s)
- Ozlem Altintas
- School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology, Pohang 37673, Korea
| | - Sangsoon Park
- Department of Life Sciences, Pohang University of Science and Technology, Pohang 37673, Korea
| | - Seung-Jae V Lee
- School of Interdisciplinary Bioscience and Bioengineering, Department of Life Sciences, and Information Technology Convergence Engineering, Pohang University of Science and Technology, Pohang 37673, Korea
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Cattie DJ, Richardson CE, Reddy KC, Ness-Cohn EM, Droste R, Thompson MK, Gilbert WV, Kim DH. Mutations in Nonessential eIF3k and eIF3l Genes Confer Lifespan Extension and Enhanced Resistance to ER Stress in Caenorhabditis elegans. PLoS Genet 2016; 12:e1006326. [PMID: 27690135 PMCID: PMC5045169 DOI: 10.1371/journal.pgen.1006326] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 08/26/2016] [Indexed: 11/18/2022] Open
Abstract
The translation initiation factor eIF3 is a multi-subunit protein complex that coordinates the assembly of the 43S pre-initiation complex in eukaryotes. Prior studies have demonstrated that not all subunits of eIF3 are essential for the initiation of translation, suggesting that some subunits may serve regulatory roles. Here, we show that loss-of-function mutations in the genes encoding the conserved eIF3k and eIF3l subunits of the translation initiation complex eIF3 result in a 40% extension in lifespan and enhanced resistance to endoplasmic reticulum (ER) stress in Caenorhabditis elegans. In contrast to previously described mutations in genes encoding translation initiation components that confer lifespan extension in C. elegans, loss-of-function mutations in eif-3.K or eif-3.L are viable, and mutants show normal rates of growth and development, and have wild-type levels of bulk protein synthesis. Lifespan extension resulting from EIF-3.K or EIF-3.L deficiency is suppressed by a mutation in the Forkhead family transcription factor DAF-16. Mutations in eif-3.K or eif-3.L also confer enhanced resistance to ER stress, independent of IRE-1-XBP-1, ATF-6, and PEK-1, and independent of DAF-16. Our data suggest a pivotal functional role for conserved eIF3k and eIF3l accessory subunits of eIF3 in the regulation of cellular and organismal responses to ER stress and aging.
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Affiliation(s)
- Douglas J. Cattie
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Claire E. Richardson
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Kirthi C. Reddy
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Elan M. Ness-Cohn
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Rita Droste
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- Howard Hughes Medical Institute, McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Mary K. Thompson
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Wendy V. Gilbert
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Dennis H. Kim
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- * E-mail:
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37
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Donovan MR, Marr MT. dFOXO Activates Large and Small Heat Shock Protein Genes in Response to Oxidative Stress to Maintain Proteostasis in Drosophila. J Biol Chem 2016; 291:19042-50. [PMID: 27435672 DOI: 10.1074/jbc.m116.723049] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Indexed: 12/11/2022] Open
Abstract
Maintaining protein homeostasis is critical for survival at the cellular and organismal level (Morimoto, R. I. (2011) Cold Spring Harb. Symp. Quant. Biol. 76, 91-99). Cells express a family of molecular chaperones, the heat shock proteins, during times of oxidative stress to protect against proteotoxicity. We have identified a second stress responsive transcription factor, dFOXO, that works alongside the heat shock transcription factor to activate transcription of both the small heat shock protein and the large heat shock protein genes. This expression likely protects cells from protein misfolding associated with oxidative stress. Here we identify the regions of the Hsp70 promoter essential for FOXO-dependent transcription using in vitro methods and find a physiological role for FOXO-dependent expression of heat shock proteins in vivo.
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Affiliation(s)
- Marissa R Donovan
- From the Department of Biology and Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, Massachusetts 02453
| | - Michael T Marr
- From the Department of Biology and Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, Massachusetts 02453
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Prithika U, Deepa V, Balamurugan K. External induction of heat shock stimulates the immune response and longevity of Caenorhabditis elegans towards pathogen exposure. Innate Immun 2016; 22:466-78. [PMID: 27317398 DOI: 10.1177/1753425916654557] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Accepted: 05/11/2016] [Indexed: 12/12/2022] Open
Abstract
Heat shock proteins (HSPs) are highly chaperonic molecules that give immediate response during any stress, tissue damage or bacterial infections. In the present study, the role of HSPs upon bacterial encounter is studied by applying external heat induction to live Caenorhabditis elegans Heat shock was observed to increase the life span of wild type C. elegans upon pathogenic encounter, indicating a role of HSPs in bacterial infection and immunity. Similar increase in resistance towards pathogenesis observed in long-lived C. elegans daf-2 mutants and the increase in the lifespan indicated a role for the insulin/IGF-1 signaling (IIS) pathway in HSP-mediated pathogenic resistance. The microscopic observation of C. elegans after external heat induction and sequential exposure of pathogens indicated reduction of egg viability. Results of Real-time PCR and immunoblotting analysis of candidate genes revealed that heat shock and IIS pathways collaborate in the observed pathogenic resistance and further suggested SGK-1 to be the possible factor linking both these pathways. In addition, survival assays carried out using mutants equips us with supporting evidence that HSP and HSF-1 are necessary for the accelerated lifespan of C. elegans Our findings thus confirm that crosstalk between HSPs and SGK-1 influences C. elegans longevity.
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Affiliation(s)
- Udayakumar Prithika
- Department of Biotechnology, Science Campus, Alagappa University, Tamil Nadu, India
| | - Veerappan Deepa
- Department of Biotechnology, Science Campus, Alagappa University, Tamil Nadu, India
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Lapierre LR, Kumsta C, Sandri M, Ballabio A, Hansen M. Transcriptional and epigenetic regulation of autophagy in aging. Autophagy 2016; 11:867-80. [PMID: 25836756 DOI: 10.1080/15548627.2015.1034410] [Citation(s) in RCA: 240] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Macroautophagy is a major intracellular degradation process recognized as playing a central role in cell survival and longevity. This multistep process is extensively regulated at several levels, including post-translationally through the action of conserved longevity factors such as the nutrient sensor TOR. More recently, transcriptional regulation of autophagy genes has emerged as an important mechanism for ensuring the somatic maintenance and homeostasis necessary for a long life span. Autophagy is increased in many long-lived model organisms and contributes significantly to their longevity. In turn, conserved transcription factors, particularly the helix-loop-helix transcription factor TFEB and the forkhead transcription factor FOXO, control the expression of many autophagy-related genes and are important for life-span extension. In this review, we discuss recent progress in understanding the contribution of these transcription factors to macroautophagy regulation in the context of aging. We also review current research on epigenetic changes, such as histone modification by the deacetylase SIRT1, that influence autophagy-related gene expression and additionally affect aging. Understanding the molecular regulation of macroautophagy in relation to aging may offer new avenues for the treatment of age-related diseases.
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Key Words
- AMPK, AMP-activated protein kinase
- Atg, autophagy related
- BNIP3, BCL2/adenovirus E1B 19kDa interacting protein 3
- CaN, calcineurin; HDAC, histone deacetylase
- FOXO
- HAT, histone acetyltransferase
- LC3, microtubule-associated protein 1 light chain 3
- MITF, microphthalmia-associated transcription factor
- PDPK1/2, 3-phosphoinositide dependent kinase 1/2
- PtdIns3K, phosphatidylinositol 3-kinase
- PtdIns3P, phosphatidylinositol 3-phosphate
- SIRT1
- TFEB
- TFEB, transcription factor EB
- TOR, target of rapamycin
- TSC, tuberous sclerosis complex
- UVRAG, UV radiation resistance associated.
- acetyl-CoA, acetyl coenzyme A
- autophagy
- epigenetics
- longevity
- miRNA
- transcription.
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Affiliation(s)
- Louis R Lapierre
- a Development, Aging and Regeneration Program; Sanford-Burnham Medical Research Institute ; La Jolla , CA USA
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40
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Furuhashi T, Matsunaga M, Asahara Y, Sakamoto K. L-arginine, an active component of salmon milt nucleoprotein, promotes thermotolerance via Sirtuin in Caenorhabditis elegans. Biochem Biophys Res Commun 2016; 472:287-91. [PMID: 26934207 DOI: 10.1016/j.bbrc.2016.02.114] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 02/27/2016] [Indexed: 01/06/2023]
Abstract
We previously showed that salmon milt nucleoprotein (NP) promotes thermotolerance in Caenorhabditis elegans; however, the active component and physiological mechanism of this effect has remained unclear. l-arginine (AR) is a major component of protamine and thus it has been proposed as the possible active component of NP. In this study, the viability of C. elegans treated with AR under heat stress was assessed and AR was shown to extend the survival term of the heat-stressed organisms. Additionally, AR was shown to restore the thrashing movement of the worms that is suppressed by heat stress. Treatment with AR was furthermore shown to promote thermotolerance in a DAF-16- and SIR-2.1-dependent manner, where DAF-16 and SIR-2.1 are homologs of FoxO and SirT1, respectively. Taken together, these data suggest that AR is one of the active components of NP and promotes thermotolerance via the activation of DAF-16 and SIR-2.1.
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Affiliation(s)
- Tsubasa Furuhashi
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8572, Japan
| | - Masaji Matsunaga
- Gene Trophology Institute Co., 3-1-3 Megumino Kita, Eniwa, Hokkaido 061-1374, Japan
| | - Yuji Asahara
- Nissan Chemical Industries, Co., Ltd., 3-7-1 Kanda-Nishikicho, Chiyoda, Tokyo 101-0054, Japan
| | - Kazuichi Sakamoto
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8572, Japan.
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41
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Kumar S, Dietrich N, Kornfeld K. Angiotensin Converting Enzyme (ACE) Inhibitor Extends Caenorhabditis elegans Life Span. PLoS Genet 2016; 12:e1005866. [PMID: 26918946 PMCID: PMC4769152 DOI: 10.1371/journal.pgen.1005866] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 01/23/2016] [Indexed: 01/23/2023] Open
Abstract
Animal aging is characterized by progressive, degenerative changes in many organ systems. Because age-related degeneration is a major contributor to disability and death in humans, treatments that delay age-related degeneration are desirable. However, no drugs that delay normal human aging are currently available. To identify drugs that delay age-related degeneration, we used the powerful Caenorhabditis elegans model system to screen for FDA-approved drugs that can extend the adult lifespan of worms. Here we show that captopril extended mean lifespan. Captopril is an angiotensin-converting enzyme (ACE) inhibitor used to treat high blood pressure in humans. To explore the mechanism of captopril, we analyzed the acn-1 gene that encodes the C. elegans homolog of ACE. Reducing the activity of acn-1 extended the mean life span. Furthermore, reducing the activity of acn-1 delayed age-related degenerative changes and increased stress resistance, indicating that acn-1 influences aging. Captopril could not further extend the lifespan of animals with reduced acn-1, suggesting they function in the same pathway; we propose that captopril inhibits acn-1 to extend lifespan. To define the relationship with previously characterized longevity pathways, we analyzed mutant animals. The lifespan extension caused by reducing the activity of acn-1 was additive with caloric restriction and mitochondrial insufficiency, and did not require sir-2.1, hsf-1 or rict-1, suggesting that acn-1 functions by a distinct mechanism. The interactions with the insulin/IGF-1 pathway were complex, since the lifespan extensions caused by captopril and reducing acn-1 activity were additive with daf-2 and age-1 but required daf-16. Captopril treatment and reducing acn-1 activity caused similar effects in a wide range of genetic backgrounds, consistent with the model that they act by the same mechanism. These results identify a new drug and a new gene that can extend the lifespan of worms and suggest new therapeutic strategies for addressing age-related degenerative changes.
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Affiliation(s)
- Sandeep Kumar
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Nicholas Dietrich
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Kerry Kornfeld
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, Missouri, United States of America
- * E-mail:
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42
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Furuhashi T, Sakamoto K. Central nervous system promotes thermotolerance via FoxO/DAF-16 activation through octopamine and acetylcholine signaling in Caenorhabditis elegans. Biochem Biophys Res Commun 2016; 472:114-7. [PMID: 26903298 DOI: 10.1016/j.bbrc.2016.02.076] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 02/18/2016] [Indexed: 10/22/2022]
Abstract
The autonomic nervous system (ANS) responds to many kinds of stressors to maintain homeostasis. Although the ANS is believed to regulate stress tolerance, the exact mechanism underlying this is not well understood. To understand this, we focused on longevity genes, which have functions such as lifespan extension and promotion of stress tolerance. To understand the relationship between ANS and longevity genes, we analyzed stress tolerance of Caenorhabditis elegans treated with octopamine, which has an affinity to noradrenaline in insects, and acetylcholine. Octopamine and acetylcholine did not show resistance against H2O2, but the neurotransmitters promoted thermotolerance via DAF-16. However, chronic treatment with octopamine and acetylcholine did not extend the lifespan, although DAF-16 plays an important role in longevity. In conclusion, our results show that octopamine and acetylcholine activate DAF-16 in response to stress, but chronic induction of octopamine and acetylcholine is not beneficial for increasing longevity.
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Affiliation(s)
- Tsubasa Furuhashi
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Japan
| | - Kazuichi Sakamoto
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Japan.
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43
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Stroustrup N, Anthony WE, Nash ZM, Gowda V, Gomez A, López-Moyado IF, Apfeld J, Fontana W. The temporal scaling of Caenorhabditis elegans ageing. Nature 2016; 530:103-7. [PMID: 26814965 PMCID: PMC4828198 DOI: 10.1038/nature16550] [Citation(s) in RCA: 118] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 12/18/2015] [Indexed: 12/22/2022]
Abstract
The process of ageing makes death increasingly likely, involving a random aspect that produces a wide distribution of lifespan even in homogeneous populations. The study of this stochastic behaviour may link molecular mechanisms to the ageing process that determines lifespan. Here, by collecting high-precision mortality statistics from large populations, we observe that interventions as diverse as changes in diet, temperature, exposure to oxidative stress, and disruption of genes including the heat shock factor hsf-1, the hypoxia-inducible factor hif-1, and the insulin/IGF-1 pathway components daf-2, age-1, and daf-16 all alter lifespan distributions by an apparent stretching or shrinking of time. To produce such temporal scaling, each intervention must alter to the same extent throughout adult life all physiological determinants of the risk of death. Organismic ageing in Caenorhabditis elegans therefore appears to involve aspects of physiology that respond in concert to a diverse set of interventions. In this way, temporal scaling identifies a novel state variable, r(t), that governs the risk of death and whose average decay dynamics involves a single effective rate constant of ageing, kr. Interventions that produce temporal scaling influence lifespan exclusively by altering kr. Such interventions, when applied transiently even in early adulthood, temporarily alter kr with an attendant transient increase or decrease in the rate of change in r and a permanent effect on remaining lifespan. The existence of an organismal ageing dynamics that is invariant across genetic and environmental contexts provides the basis for a new, quantitative framework for evaluating the manner and extent to which specific molecular processes contribute to the aspect of ageing that determines lifespan.
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Affiliation(s)
- Nicholas Stroustrup
- Department of Systems Biology, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Winston E Anthony
- Department of Systems Biology, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Zachary M Nash
- Department of Systems Biology, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Vivek Gowda
- Department of Systems Biology, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Adam Gomez
- Department of Systems Biology, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Isaac F López-Moyado
- Department of Systems Biology, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Javier Apfeld
- Department of Systems Biology, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Walter Fontana
- Department of Systems Biology, Harvard Medical School, Boston, Massachusetts 02115, USA
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44
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Cornes E, Porta-De-La-Riva M, Aristizábal-Corrales D, Brokate-Llanos AM, García-Rodríguez FJ, Ertl I, Díaz M, Fontrodona L, Reis K, Johnsen R, Baillie D, Muñoz MJ, Sarov M, Dupuy D, Cerón J. Cytoplasmic LSM-1 protein regulates stress responses through the insulin/IGF-1 signaling pathway in Caenorhabditis elegans. RNA (NEW YORK, N.Y.) 2015; 21:1544-53. [PMID: 26150554 PMCID: PMC4536316 DOI: 10.1261/rna.052324.115] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Accepted: 06/06/2015] [Indexed: 05/04/2023]
Abstract
Genes coding for members of the Sm-like (LSm) protein family are conserved through evolution from prokaryotes to humans. These proteins have been described as forming homo- or heterocomplexes implicated in a broad range of RNA-related functions. To date, the nuclear LSm2-8 and the cytoplasmic LSm1-7 heteroheptamers are the best characterized complexes in eukaryotes. Through a comprehensive functional study of the LSm family members, we found that lsm-1 and lsm-3 are not essential for C. elegans viability, but their perturbation, by RNAi or mutations, produces defects in development, reproduction, and motility. We further investigated the function of lsm-1, which encodes the distinctive protein of the cytoplasmic complex. RNA-seq analysis of lsm-1 mutants suggests that they have impaired Insulin/IGF-1 signaling (IIS), which is conserved in metazoans and involved in the response to various types of stress through the action of the FOXO transcription factor DAF-16. Further analysis using a DAF-16::GFP reporter indicated that heat stress-induced translocation of DAF-16 to the nuclei is dependent on lsm-1. Consistent with this, we observed that lsm-1 mutants display heightened sensitivity to thermal stress and starvation, while overexpression of lsm-1 has the opposite effect. We also observed that under stress, cytoplasmic LSm proteins aggregate into granules in an LSM-1-dependent manner. Moreover, we found that lsm-1 and lsm-3 are required for other processes regulated by the IIS pathway, such as aging and pathogen resistance.
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Affiliation(s)
- Eric Cornes
- Cancer and Human Molecular Genetics, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet de Llobregat, Barcelona 08908, Spain Université Bordeaux, IECB, Laboratoire ARNA, F-33600 Pessac, France INSERM, U869, Laboratoire ARNA, F-33000 Bordeaux, France
| | - Montserrat Porta-De-La-Riva
- Cancer and Human Molecular Genetics, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet de Llobregat, Barcelona 08908, Spain C. elegans Core Facility, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet de Llobregat, Barcelona 08908, Spain
| | - David Aristizábal-Corrales
- Cancer and Human Molecular Genetics, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet de Llobregat, Barcelona 08908, Spain
| | - Ana María Brokate-Llanos
- Centro Andaluz de Biología del Desarrollo (CABD), CSIC - UPO - Junta de Andalucía, Sevilla 41013, Spain
| | - Francisco Javier García-Rodríguez
- Cancer and Human Molecular Genetics, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet de Llobregat, Barcelona 08908, Spain
| | - Iris Ertl
- Cancer and Human Molecular Genetics, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet de Llobregat, Barcelona 08908, Spain
| | - Mònica Díaz
- Drug Delivery and Targeting, CIBBIM-Nanomedicine, Vall d'Hebron Research Institute, Universidad Autónoma de Barcelona, Barcelona 08035, Spain
| | - Laura Fontrodona
- Cancer and Human Molecular Genetics, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet de Llobregat, Barcelona 08908, Spain
| | - Kadri Reis
- Cancer and Human Molecular Genetics, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet de Llobregat, Barcelona 08908, Spain
| | - Robert Johnsen
- Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - David Baillie
- Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - Manuel J Muñoz
- Centro Andaluz de Biología del Desarrollo (CABD), CSIC - UPO - Junta de Andalucía, Sevilla 41013, Spain
| | - Mihail Sarov
- TransgeneOmics Unit, Max Planck Institute of Molecular Cell Biology and Genetics, Dresden 01307, Germany
| | - Denis Dupuy
- Université Bordeaux, IECB, Laboratoire ARNA, F-33600 Pessac, France INSERM, U869, Laboratoire ARNA, F-33000 Bordeaux, France
| | - Julián Cerón
- Cancer and Human Molecular Genetics, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet de Llobregat, Barcelona 08908, Spain
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Protein synthesis as an integral quality control mechanism during ageing. Ageing Res Rev 2015; 23:75-89. [PMID: 25555680 DOI: 10.1016/j.arr.2014.12.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 12/18/2014] [Accepted: 12/22/2014] [Indexed: 01/17/2023]
Abstract
Ageing is manifested as functional and structural deterioration that affects cell and tissue physiology. mRNA translation is a central cellular process, supplying cells with newly synthesized proteins. Accumulating evidence suggests that alterations in protein synthesis are not merely a corollary but rather a critical factor for the progression of ageing. Here, we survey protein synthesis regulatory mechanisms and focus on the pre-translational regulation of the process exerted by non-coding RNA species, RNA binding proteins and alterations of intrinsic RNA properties. In addition, we discuss the tight relationship between mRNA translation and two central pathways that modulate ageing, namely the insulin/IGF-1 and TOR signalling cascades. A thorough understanding of the complex interplay between protein synthesis regulation and ageing will provide critical insights into the pathogenesis of age-related disorders, associated with impaired proteostasis and protein quality control.
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Douglas PM, Baird NA, Simic MS, Uhlein S, McCormick MA, Wolff SC, Kennedy BK, Dillin A. Heterotypic Signals from Neural HSF-1 Separate Thermotolerance from Longevity. Cell Rep 2015; 12:1196-1204. [PMID: 26257177 DOI: 10.1016/j.celrep.2015.07.026] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Revised: 06/05/2015] [Accepted: 07/13/2015] [Indexed: 10/23/2022] Open
Abstract
Integrating stress responses across tissues is essential for the survival of multicellular organisms. The metazoan nervous system can sense protein-misfolding stress arising in different subcellular compartments and initiate cytoprotective transcriptional responses in the periphery. Several subcellular compartments possess a homotypic signal whereby the respective compartment relies on a single signaling mechanism to convey information within the affected cell to the same stress-responsive pathway in peripheral tissues. In contrast, we find that the heat shock transcription factor, HSF-1, specifies its mode of transcellular protection via two distinct signaling pathways. Upon thermal stress, neural HSF-1 primes peripheral tissues through the thermosensory neural circuit to mount a heat shock response. Independent of this thermosensory circuit, neural HSF-1 activates the FOXO transcription factor, DAF-16, in the periphery and prolongs lifespan. Thus a single transcription factor can coordinate different stress response pathways to specify its mode of protection against changing environmental conditions.
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Affiliation(s)
- Peter M Douglas
- Howard Hughes Medical Institute, University of California, Berkeley CA 94720, USA
| | - Nathan A Baird
- Howard Hughes Medical Institute, University of California, Berkeley CA 94720, USA
| | - Milos S Simic
- Howard Hughes Medical Institute, University of California, Berkeley CA 94720, USA
| | - Sarah Uhlein
- Howard Hughes Medical Institute, University of California, Berkeley CA 94720, USA
| | | | - Suzanne C Wolff
- Howard Hughes Medical Institute, University of California, Berkeley CA 94720, USA
| | - Brian K Kennedy
- The Buck Institute for Research on Aging, Novato CA 94945 USA.,Department of Biochemistry, University of Washington, Seattle WA 98195, USA
| | - Andrew Dillin
- Howard Hughes Medical Institute, University of California, Berkeley CA 94720, USA
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Zhang Y, Lv T, Li M, Xue T, Liu H, Zhang W, Ding X, Zhuang Z. Anti-aging effect of polysaccharide from Bletilla striata on nematode Caenorhabditis elegans. Pharmacogn Mag 2015; 11:449-54. [PMID: 26246718 PMCID: PMC4522829 DOI: 10.4103/0973-1296.160447] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Revised: 06/19/2014] [Accepted: 07/10/2015] [Indexed: 01/24/2023] Open
Abstract
BACKGROUND Polysaccharide isolated from Bletilla striata, a well-known traditional Chinese medicine (Bletilla striata polysaccharide [BSP]) has been found to play important roles in endothelial cells proliferation, inducible nitric oxide stimulation, wound healing acceleration and other processes. Recent studies found that B. striata has anti-oxidative properties, however, potential anti-aging effects of BSP in whole organisms has not been characterized. OBJECTIVE To investigate whether BSP has anti-aging effects on Caenorhabditis elegans. MATERIALS AND METHODS After treatment with BSP, the lifespan, locomotion ability, and stress resistance of C. elegans was determined. To provide insight into the underlying mechanism for the anti-aging effect of BSP, we measured its effect on bacterial growth, brood size of C. elegans, and the insulin/insulin-like growth factor (IGF) signaling pathway. RESULTS After BSP treatment, the lifespan of C. elegans was extended, and its locomotion ability and stress resistance were increased. BSP was found to have no effect on bacterial growth or on reproduction of C. elegans, However, mRNA levels of age-1 and hcf-1 were reduced after BSP treatment. Additionally, we observed that BSP did not extend the lifespan of daf-16 mutant animals. CONCLUSION BSP produces an anti-aging effect on C. elegans through the insulin/IGF signaling pathway and holds promise for future development as a functional food.
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Affiliation(s)
- Yusi Zhang
- College of Life Sciences, Nanjing Normal University, Nanjing, 210046, China
| | - Ting Lv
- College of Life Sciences, Nanjing Normal University, Nanjing, 210046, China
| | - Min Li
- School of Pharmaceutical Engineering and Life Sciences, Changzhou University, Changzhou, 213164, China
| | - Ting Xue
- School of Pharmaceutical Engineering and Life Sciences, Changzhou University, Changzhou, 213164, China
| | - Hui Liu
- School of Pharmaceutical Engineering and Life Sciences, Changzhou University, Changzhou, 213164, China
| | - Weiming Zhang
- College of Life Sciences, Nanjing Normal University, Nanjing, 210046, China
| | - Xiaoyu Ding
- College of Life Sciences, Nanjing Normal University, Nanjing, 210046, China
| | - Ziheng Zhuang
- School of Pharmaceutical Engineering and Life Sciences, Changzhou University, Changzhou, 213164, China
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Abstract
FoxO transcription factors promote longevity across taxa. How they do so is poorly understood. In the nematode Caenorhabditis elegans, the A- and F-isoforms of the FoxO transcription factor DAF-16 extend life span in the context of reduced DAF-2 insulin-like growth factor receptor (IGFR) signaling. To elucidate the mechanistic basis for DAF-16/FoxO-dependent life span extension, we performed an integrative analysis of isoform-specific daf-16/FoxO mutants. In contrast to previous studies suggesting that DAF-16F plays a more prominent role in life span control than DAF-16A, isoform-specific daf-16/FoxO mutant phenotypes and whole transcriptome profiling revealed a predominant role for DAF-16A over DAF-16F in life span control, stress resistance, and target gene regulation. Integration of these datasets enabled the prioritization of a subset of 92 DAF-16/FoxO target genes for functional interrogation. Among 29 genes tested, two DAF-16A-specific target genes significantly influenced longevity. A loss-of-function mutation in the conserved gene gst-20, which is induced by DAF-16A, reduced life span extension in the context of daf-2/IGFR RNAi without influencing longevity in animals subjected to control RNAi. Therefore, gst-20 promotes DAF-16/FoxO-dependent longevity. Conversely, a loss-of-function mutation in srr-4, a gene encoding a seven-transmembrane-domain receptor family member that is repressed by DAF-16A, extended life span in control animals, indicating that DAF-16/FoxO may extend life span at least in part by reducing srr-4 expression. Our discovery of new longevity genes underscores the efficacy of our integrative strategy while providing a general framework for identifying specific downstream gene regulatory events that contribute substantially to transcription factor functions. As FoxO transcription factors have conserved functions in promoting longevity and may be dysregulated in aging-related diseases, these findings promise to illuminate fundamental principles underlying aging in animals.
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Heat shock factor 1 prevents the reduction in thrashing due to heat shock in Caenorhabditis elegans. Biochem Biophys Res Commun 2015; 462:190-4. [DOI: 10.1016/j.bbrc.2015.04.086] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Accepted: 04/17/2015] [Indexed: 12/11/2022]
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50
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James SA, Roberts BR, Hare DJ, de Jonge MD, Birchall IE, Jenkins NL, Cherny RA, Bush AI, McColl G. Direct in vivo imaging of ferrous iron dyshomeostasis in ageing Caenorhabditis elegans. Chem Sci 2015; 6:2952-2962. [PMID: 28706676 PMCID: PMC5490054 DOI: 10.1039/c5sc00233h] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Accepted: 03/03/2015] [Indexed: 01/09/2023] Open
Abstract
Iron is essential for eukaryotic biochemistry. Systematic trafficking and storage is required to maintain supply of iron while preventing it from catalysing unwanted reactions, particularly the generation of oxidising reactive species. Iron dyshomeostasis has been implicated in major age-associated diseases including cancers, neurodegeneration and heart disease. Here, we employ population-level X-ray fluorescence imaging and native-metalloproteomic analysis to determine that altered iron coordination and distribution is a pathological imperative of ageing in the nematode, Caenorhabditis elegans. Our approach provides a method to simultaneously study iron metabolism across different scales of biological organisation, from populations to cells. Here we report how and where iron homeostasis is lost during C. elegans ageing, and its relationship to the age-related elevation of damaging reactive oxygen species. We find that wild types utilise ferritin to sustain longevity, buffering against exogenous iron and showing rapid ageing if ferritin is ablated. After reproduction, escape of iron from safe-storage in ferritin raised cellular Fe2+ load in the ageing C. elegans, and increased generation of reactive species. These findings support the hypothesis that iron-mediated processes drive senescence. We propose that loss of iron homeostasis may be a fundamental and inescapable consequence of ageing that could represent a critical target for therapeutic strategies to improve health outcomes in ageing.
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Affiliation(s)
- Simon A James
- Australian Synchrotron , Clayton , Victoria , Australia
- Commonwealth Scientific and Industrial Research Organisation , Clayton , Victoria , Australia
- The Florey Institute of Neuroscience and Mental Health , The University of Melbourne , Kenneth Myer Building, 30 Royal Parade , Parkville , Victoria , Australia 3052 . ; ; Tel: +61 3 9035 6608
| | - Blaine R Roberts
- The Florey Institute of Neuroscience and Mental Health , The University of Melbourne , Kenneth Myer Building, 30 Royal Parade , Parkville , Victoria , Australia 3052 . ; ; Tel: +61 3 9035 6608
| | - Dominic J Hare
- The Florey Institute of Neuroscience and Mental Health , The University of Melbourne , Kenneth Myer Building, 30 Royal Parade , Parkville , Victoria , Australia 3052 . ; ; Tel: +61 3 9035 6608
- Elemental Bio-imaging Facility , University of Technology Sydney , Broadway , New South Wales , Australia
- Exposure Biology Laboratory , Lautenberg Environment Health Sciences Laboratory , Department of Preventive Medicine , Icahn School of Medicine at Mount Sinai , New York , New York , USA
| | | | - Ian E Birchall
- The Florey Institute of Neuroscience and Mental Health , The University of Melbourne , Kenneth Myer Building, 30 Royal Parade , Parkville , Victoria , Australia 3052 . ; ; Tel: +61 3 9035 6608
| | - Nicole L Jenkins
- The Florey Institute of Neuroscience and Mental Health , The University of Melbourne , Kenneth Myer Building, 30 Royal Parade , Parkville , Victoria , Australia 3052 . ; ; Tel: +61 3 9035 6608
| | - Robert A Cherny
- The Florey Institute of Neuroscience and Mental Health , The University of Melbourne , Kenneth Myer Building, 30 Royal Parade , Parkville , Victoria , Australia 3052 . ; ; Tel: +61 3 9035 6608
| | - Ashley I Bush
- The Florey Institute of Neuroscience and Mental Health , The University of Melbourne , Kenneth Myer Building, 30 Royal Parade , Parkville , Victoria , Australia 3052 . ; ; Tel: +61 3 9035 6608
| | - Gawain McColl
- The Florey Institute of Neuroscience and Mental Health , The University of Melbourne , Kenneth Myer Building, 30 Royal Parade , Parkville , Victoria , Australia 3052 . ; ; Tel: +61 3 9035 6608
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