1
|
Liu A, Li X, Zhou L, Yan X, Xia N, Song Z, Cao J, Hao Z, Zhang Z, Liang R, Zhang H. BPDE-DNA adduct formation and alterations of mRNA, protein, and DNA methylation of CYP1A1, GSTP1, and GSTM1 induced by benzo[a]pyrene and the intervention of aspirin in mice. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:106549-106561. [PMID: 37730975 DOI: 10.1007/s11356-023-29878-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2023] [Accepted: 09/10/2023] [Indexed: 09/22/2023]
Abstract
Benzo[a]pyrene (B[a]P), one typical environmental pollutant, the toxicity mechanisms, and potential prevention remain perplexing. Available evidence suggests cytochrome P450 1A1 (CYP1A1) and glutathione S-transferases (GSTs) metabolize B[a]P, resulting in metabolic activation and detoxification of B[a]P. This study aimed to reveal the impact of B[a]P exposure on trans-7,8-diol-anti-9,10-epoxide DNA (BPDE-DNA) adduct formation, level of CYP1A1, glutathione S-transferase pi (GSTP1) and glutathione S-transferase mu1 (GSTM1) mRNA, protein and DNA methylation in mice, and the potential prevention of aspirin (ASP). This study firstly determined the BPDE-DNA adduct formation in an acute toxicity test of a large dose in mice induced by B[a]P, which subsequently detected CYP1A1, GSTP1, and GSTM1 at levels of mRNA, protein, and DNA methylation in the organs of mice in a subacute toxicity test at appropriate doses and the potential prevention of ASP, using the methods of real-time quantitative PCR (QPCR), western blotting, and real-time methylation-specific PCR (MSP), respectively. The results verified that B[a]P induced the formation of BPDE-DNA adduct in all the organs of mice in an acute toxicity test, and the order of concentration of which was lung > kidney > liver > brain. In a subacute toxicity test, following B[a]P treatment, mice showed a dose-dependent slowdown in body weight gain and abnormalities in behavioral and cognitive function and which were alleviated by ASP co-treatment. Compared to the controls, following B[a]P treatment, CYP1A1 was significantly induced in all organs in mice at mRNA level (P < 0.05), was suppressed in the lung and cerebrum of mice at protein level, and inhibited at DNA methylation level in the liver, lung, and cerebrum, whereas GSTP1 and GSTM1 at mRNA, protein, and DNA methylation levels showed organ-specific changes in mice following B[a]P treatment, which was generally alleviated by ASP intervention. In conclusion, B[a]P induced BPDE-DNA adduct formation in all organs in mice and altered the mRNA, protein, and DNA methylation levels in CYP1A1, GSTP1, and GSTM1 in an organ-dependent pattern, which could be related to the organ toxicity and mechanism of B[a]P. ASP intervention may be an effective measure to prevent B[a]P toxicity. The findings provide scientific evidence for further study on the organ toxicity and mechanisms of B[a]P.
Collapse
Affiliation(s)
- Aixiang Liu
- Department of Environmental Health, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001, Shanxi, China
- Department of Health Information Management, Shanxi Medical University Fenyang College, Fenyang, 032200, Shanxi, China
| | - Xin Li
- Center of Disease Control and Prevention, Taiyuan Iron and Steel Co Ltd, Taiyuan, 030003, Shanxi, China
| | - Lisha Zhou
- Department of Environmental Health, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001, Shanxi, China
| | - Xiaoqing Yan
- Department of Environmental Health, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001, Shanxi, China
| | - Na Xia
- Department of Environmental Health, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001, Shanxi, China
- Key Laboratory of Coal Environmental Pathogenicity and Prevention, Ministry of Education, Taiyuan, 030001, Shanxi, China
| | - Zhanfei Song
- Department of Environmental Health, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001, Shanxi, China
| | - Jingjing Cao
- Department of Environmental Health, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001, Shanxi, China
| | - Zhongsuo Hao
- Department of Environmental Health, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001, Shanxi, China
| | - Zhihong Zhang
- Department of Environmental Health, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001, Shanxi, China
| | - Ruifeng Liang
- Department of Environmental Health, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001, Shanxi, China
| | - Hongmei Zhang
- Department of Environmental Health, School of Public Health, Shanxi Medical University, 56 Xinjian South Road, Taiyuan, 030001, Shanxi, China.
| |
Collapse
|
2
|
Jung R, Lechler MC, Fernandez-Villegas A, Chung CW, Jones HC, Choi YH, Thompson MA, Rödelsperger C, Röseler W, Kaminski Schierle GS, Sommer RJ, David DC. A safety mechanism enables tissue-specific resistance to protein aggregation during aging in C. elegans. PLoS Biol 2023; 21:e3002284. [PMID: 37708127 PMCID: PMC10501630 DOI: 10.1371/journal.pbio.3002284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 08/01/2023] [Indexed: 09/16/2023] Open
Abstract
During aging, proteostasis capacity declines and distinct proteins become unstable and can accumulate as protein aggregates inside and outside of cells. Both in disease and during aging, proteins selectively aggregate in certain tissues and not others. Yet, tissue-specific regulation of cytoplasmic protein aggregation remains poorly understood. Surprisingly, we found that the inhibition of 3 core protein quality control systems, namely chaperones, the proteasome, and macroautophagy, leads to lower levels of age-dependent protein aggregation in Caenorhabditis elegans pharyngeal muscles, but higher levels in body-wall muscles. We describe a novel safety mechanism that selectively targets newly synthesized proteins to suppress their aggregation and associated proteotoxicity. The safety mechanism relies on macroautophagy-independent lysosomal degradation and involves several previously uncharacterized components of the intracellular pathogen response (IPR). We propose that this protective mechanism engages an anti-aggregation machinery targeting aggregating proteins for lysosomal degradation.
Collapse
Affiliation(s)
- Raimund Jung
- German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | - Marie C. Lechler
- German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
- Graduate Training Centre of Neuroscience, International Max Planck Research School, Tübingen, Germany
| | - Ana Fernandez-Villegas
- Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, United Kingdom
| | - Chyi Wei Chung
- Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, United Kingdom
| | - Harry C. Jones
- The Babraham Institute, Signalling Program, Cambridge, United Kingdom
| | - Yoon Hee Choi
- The Babraham Institute, Signalling Program, Cambridge, United Kingdom
| | | | - Christian Rödelsperger
- Max Planck Institute for Developmental Biology, Department for Integrative Evolutionary Biology, Tübingen, Germany
| | - Waltraud Röseler
- Max Planck Institute for Developmental Biology, Department for Integrative Evolutionary Biology, Tübingen, Germany
| | | | - Ralf J. Sommer
- Max Planck Institute for Developmental Biology, Department for Integrative Evolutionary Biology, Tübingen, Germany
| | - Della C. David
- German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
- The Babraham Institute, Signalling Program, Cambridge, United Kingdom
- Interfaculty Institute of Biochemistry, University of Tübingen, Tübingen, Germany
| |
Collapse
|
3
|
Tardigrade small heat shock proteins can limit desiccation-induced protein aggregation. Commun Biol 2023; 6:121. [PMID: 36717706 PMCID: PMC9887055 DOI: 10.1038/s42003-023-04512-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 01/20/2023] [Indexed: 01/31/2023] Open
Abstract
Small heat shock proteins (sHSPs) are chaperones with well-characterized roles in heat stress, but potential roles for sHSPs in desiccation tolerance have not been as thoroughly explored. We identified nine sHSPs from the tardigrade Hypsibius exemplaris, each containing a conserved alpha-crystallin domain flanked by disordered regions. Many of these sHSPs are highly expressed. Multiple tardigrade and human sHSPs could improve desiccation tolerance of E. coli, suggesting that the capacity to contribute to desicco-protection is a conserved property of some sHSPs. Purification and subsequent analysis of two tardigrade sHSPs, HSP21 and HSP24.6, revealed that these proteins can oligomerize in vitro. These proteins limited heat-induced aggregation of the model enzyme citrate synthase. Heterologous expression of HSP24.6 improved bacterial heat shock survival, and the protein significantly reduced heat-induced aggregation of soluble bacterial protein. Thus, HSP24.6 likely chaperones against protein aggregation to promote heat tolerance. Furthermore, HSP21 and HSP24.6 limited desiccation-induced aggregation and loss of function of citrate synthase. This suggests a mechanism by which tardigrade sHSPs promote desiccation tolerance, by limiting desiccation-induced protein aggregation, thereby maintaining proteostasis and supporting survival. These results suggest that sHSPs provide a mechanism of general stress resistance that can also be deployed to support survival during anhydrobiosis.
Collapse
|
4
|
Frankowska N, Lisowska K, Witkowski JM. Proteolysis dysfunction in the process of aging and age-related diseases. FRONTIERS IN AGING 2022; 3:927630. [PMID: 35958270 PMCID: PMC9361021 DOI: 10.3389/fragi.2022.927630] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2022] [Accepted: 06/30/2022] [Indexed: 12/20/2022]
Abstract
In this review, we discuss in detail the most relevant proteolytic systems that together with chaperones contribute to creating the proteostasis network that is kept in dynamic balance to maintain overall functionality of cellular proteomes. Data accumulated over decades demonstrate that the effectiveness of elements of the proteostasis network declines with age. In this scenario, failure to degrade misfolded or faulty proteins increases the risk of protein aggregation, chronic inflammation, and the development of age-related diseases. This is especially important in the context of aging-related modification of functions of the immune system.
Collapse
Affiliation(s)
- Natalia Frankowska
- Department of Physiopathology, Faculty of Medicine, Medical University of Gdansk, Gdańsk, Poland
| | - Katarzyna Lisowska
- Department of Physiopathology, Faculty of Medicine, Medical University of Gdansk, Gdańsk, Poland
| | - Jacek M Witkowski
- Department of Physiopathology, Faculty of Medicine, Medical University of Gdansk, Gdańsk, Poland
| |
Collapse
|
5
|
Differential regulation of degradation and immune pathways underlies adaptation of the ectosymbiotic nematode Laxus oneistus to oxic-anoxic interfaces. Sci Rep 2022; 12:9725. [PMID: 35697683 PMCID: PMC9192688 DOI: 10.1038/s41598-022-13235-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 05/13/2022] [Indexed: 11/09/2022] Open
Abstract
Eukaryotes may experience oxygen deprivation under both physiological and pathological conditions. Because oxygen shortage leads to a reduction in cellular energy production, all eukaryotes studied so far conserve energy by suppressing their metabolism. However, the molecular physiology of animals that naturally and repeatedly experience anoxia is underexplored. One such animal is the marine nematode Laxus oneistus. It thrives, invariably coated by its sulfur-oxidizing symbiont Candidatus Thiosymbion oneisti, in anoxic sulfidic or hypoxic sand. Here, transcriptomics and proteomics showed that, whether in anoxia or not, L. oneistus mostly expressed genes involved in ubiquitination, energy generation, oxidative stress response, immune response, development, and translation. Importantly, ubiquitination genes were also highly expressed when the nematode was subjected to anoxic sulfidic conditions, together with genes involved in autophagy, detoxification and ribosome biogenesis. We hypothesize that these degradation pathways were induced to recycle damaged cellular components (mitochondria) and misfolded proteins into nutrients. Remarkably, when L. oneistus was subjected to anoxic sulfidic conditions, lectin and mucin genes were also upregulated, potentially to promote the attachment of its thiotrophic symbiont. Furthermore, the nematode appeared to survive oxygen deprivation by using an alternative electron carrier (rhodoquinone) and acceptor (fumarate), to rewire the electron transfer chain. On the other hand, under hypoxia, genes involved in costly processes (e.g., amino acid biosynthesis, development, feeding, mating) were upregulated, together with the worm's Toll-like innate immunity pathway and several immune effectors (e.g., bactericidal/permeability-increasing proteins, fungicides). In conclusion, we hypothesize that, in anoxic sulfidic sand, L. oneistus upregulates degradation processes, rewires the oxidative phosphorylation and reinforces its coat of bacterial sulfur-oxidizers. In upper sand layers, instead, it appears to produce broad-range antimicrobials and to exploit oxygen for biosynthesis and development.
Collapse
|
6
|
Nisaa K, Ben-Zvi A. HLH-1 Modulates Muscle Proteostasis During Caenorhabditis elegans Larval Development. Front Cell Dev Biol 2022; 10:920569. [PMID: 35733850 PMCID: PMC9207508 DOI: 10.3389/fcell.2022.920569] [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: 04/14/2022] [Accepted: 05/18/2022] [Indexed: 11/13/2022] Open
Abstract
Muscle proteostasis is shaped by the myogenic transcription factor MyoD which regulates the expression of chaperones during muscle differentiation. Whether MyoD can also modulate chaperone expression in terminally differentiated muscle cells remains open. Here we utilized a temperature-sensitive (ts) conditional knockdown nonsense mutation in MyoD ortholog in C. elegans, HLH-1, to ask whether MyoD plays a role in maintaining muscle proteostasis post myogenesis. We showed that hlh-1 is expressed during larval development and that hlh-1 knockdown at the first, second, or third larval stages resulted in severe defects in motility and muscle organization. Motility defects and myofilament organization were rescued when the clearance of hlh-1(ts) mRNA was inhibited, and hlh-1 mRNA levels were restored. Moreover, hlh-1 knockdown modulated the expression of chaperones with putative HLH-1 binding sites in their promoters, supporting HLH-1 role in muscle maintenance during larval development. Finally, mild disruption of hlh-1 expression during development resulted in earlier dysregulation of muscle maintenance and function during adulthood. We propose that the differentiation transcription factor, HLH-1, contributes to muscle maintenance and regulates cell-specific chaperone expression post differentiation. HLH-1 may thus impact muscle proteostasis and potentially the onset and manifestation of sarcopenia.
Collapse
|
7
|
Neuropeptide signaling and SKN-1 orchestrate differential responses of the proteostasis network to dissimilar proteotoxic insults. Cell Rep 2022; 38:110350. [PMID: 35139369 DOI: 10.1016/j.celrep.2022.110350] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 11/15/2021] [Accepted: 01/19/2022] [Indexed: 01/01/2023] Open
Abstract
The protein homeostasis (proteostasis) network (PN) encompasses mechanisms that maintain proteome integrity by controlling various biological functions. Loss of proteostasis leads to toxic protein aggregation (proteotoxicity), which underlies the manifestation of neurodegeneration. How the PN responds to dissimilar proteotoxic challenges and how these responses are regulated at the organismal level are largely unknown. Here, we report that, while torsin chaperones protect from the toxicity of neurodegeneration-causing polyglutamine stretches, they exacerbate the toxicity of the Alzheimer's disease-causing Aβ peptide in neurons and muscles. These opposing effects are accompanied by differential modulations of gene expression, including that of three neuropeptides that are involved in tailoring the organismal response to dissimilar proteotoxic insults. This mechanism is regulated by insulin/IGF signaling and the transcription factor SKN-1/NRF. Our work delineates a mechanism by which the PN orchestrates differential responses to dissimilar proteotoxic challenges and points at potential targets for therapeutic interventions.
Collapse
|
8
|
Nisaa K, Ben-Zvi A. Chaperone networks are shaped by cellular differentiation and identity. Trends Cell Biol 2021; 32:470-474. [PMID: 34863585 DOI: 10.1016/j.tcb.2021.11.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 10/29/2021] [Accepted: 11/03/2021] [Indexed: 11/30/2022]
Abstract
Chaperone expression is developmentally regulated, establishing tissue-specific networks. However, the molecular basis underlying this specificity is mainly unknown. Recent evidence suggests that chaperone network rewiring is mediated, in part, by differentiation transcription factors to fit the proteome folding demands, with implications for the tissue-specific manifestation of protein misfolding diseases.
Collapse
Affiliation(s)
- Khairun Nisaa
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Anat Ben-Zvi
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel.
| |
Collapse
|
9
|
Tiago T, Hummel B, Morelli FF, Basile V, Vinet J, Galli V, Mediani L, Antoniani F, Pomella S, Cassandri M, Garone MG, Silvestri B, Cimino M, Cenacchi G, Costa R, Mouly V, Poser I, Yeger-Lotem E, Rosa A, Alberti S, Rota R, Ben-Zvi A, Sawarkar R, Carra S. Small heat-shock protein HSPB3 promotes myogenesis by regulating the lamin B receptor. Cell Death Dis 2021; 12:452. [PMID: 33958580 PMCID: PMC8102500 DOI: 10.1038/s41419-021-03737-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 04/16/2021] [Accepted: 04/19/2021] [Indexed: 02/03/2023]
Abstract
One of the critical events that regulates muscle cell differentiation is the replacement of the lamin B receptor (LBR)-tether with the lamin A/C (LMNA)-tether to remodel transcription and induce differentiation-specific genes. Here, we report that localization and activity of the LBR-tether are crucially dependent on the muscle-specific chaperone HSPB3 and that depletion of HSPB3 prevents muscle cell differentiation. We further show that HSPB3 binds to LBR in the nucleoplasm and maintains it in a dynamic state, thus promoting the transcription of myogenic genes, including the genes to remodel the extracellular matrix. Remarkably, HSPB3 overexpression alone is sufficient to induce the differentiation of two human muscle cell lines, LHCNM2 cells, and rhabdomyosarcoma cells. We also show that mutant R116P-HSPB3 from a myopathy patient with chromatin alterations and muscle fiber disorganization, forms nuclear aggregates that immobilize LBR. We find that R116P-HSPB3 is unable to induce myoblast differentiation and instead activates the unfolded protein response. We propose that HSPB3 is a specialized chaperone engaged in muscle cell differentiation and that dysfunctional HSPB3 causes neuromuscular disease by deregulating LBR.
Collapse
Affiliation(s)
- Tatiana Tiago
- Centre for Neuroscience and Nanotechnology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, 41125, Modena, Italy
| | - Barbara Hummel
- Max Planck Institute of Immunobiology and Epigenetics, 79108, Freiburg, Germany
| | - Federica F Morelli
- Centre for Neuroscience and Nanotechnology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, 41125, Modena, Italy
| | - Valentina Basile
- Centre for Neuroscience and Nanotechnology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, 41125, Modena, Italy
| | - Jonathan Vinet
- Centre for Neuroscience and Nanotechnology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, 41125, Modena, Italy
| | - Veronica Galli
- Centre for Neuroscience and Nanotechnology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, 41125, Modena, Italy
| | - Laura Mediani
- Centre for Neuroscience and Nanotechnology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, 41125, Modena, Italy
| | - Francesco Antoniani
- Centre for Neuroscience and Nanotechnology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, 41125, Modena, Italy
| | - Silvia Pomella
- Department of Oncohematology, Bambino Gesù Children's Hospital, IRCCS, 00165, Rome, Italy
| | - Matteo Cassandri
- Department of Oncohematology, Bambino Gesù Children's Hospital, IRCCS, 00165, Rome, Italy
| | - Maria Giovanna Garone
- Department of Biology and Biotechnologies "Charles Darwin", Sapienza University of Rome, 00185, Rome, Italy
| | - Beatrice Silvestri
- Department of Biology and Biotechnologies "Charles Darwin", Sapienza University of Rome, 00185, Rome, Italy
- Center for Life Nano- & Neuro-Science, Fondazione Istituto Italiano di Tecnologia (IIT), 00161, Rome, Italy
| | - Marco Cimino
- Centre for Neuroscience and Nanotechnology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, 41125, Modena, Italy
| | - Giovanna Cenacchi
- Department of Biomedical and Neuromotor Sciences DIBINEM, University of Bologna, Bologna, Italy; Centre for Applied Biomedical Research - CRBA, University of Bologna, IRCCS St. Orsola Hospital, Bologna, Italy
| | - Roberta Costa
- Department of Biomedical and Neuromotor Sciences DIBINEM, University of Bologna, Bologna, Italy; Centre for Applied Biomedical Research - CRBA, University of Bologna, IRCCS St. Orsola Hospital, Bologna, Italy
| | - Vincent Mouly
- Centre de Recherche en Myologie, Sorbonne Université, Inserm, Institut de Myologie, F-75013, Paris, France
| | - Ina Poser
- Max Planck Institute of Molecular Cell Biology and Genetics, 01307, Dresden, Germany
- Dewpoint Therapeutics GmbH, Tatzberg 47, 01307, Dresden, Germany
| | - Esti Yeger-Lotem
- Department of Clinical Biochemistry and Pharmacology and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva, 84105, Israel
| | - Alessandro Rosa
- Department of Biology and Biotechnologies "Charles Darwin", Sapienza University of Rome, 00185, Rome, Italy
- Center for Life Nano- & Neuro-Science, Fondazione Istituto Italiano di Tecnologia (IIT), 00161, Rome, Italy
| | - Simon Alberti
- Biotechnology Center (BIOTEC), Center for Molecular and Cellular Bioengineering (CMCB), Technische Universität Dresden, Tatzberg 47/49, 01307, Dresden, Germany
| | - Rossella Rota
- Department of Oncohematology, Bambino Gesù Children's Hospital, IRCCS, 00165, Rome, Italy
| | - Anat Ben-Zvi
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer Sheva, 84105, Israel
| | - Ritwick Sawarkar
- Max Planck Institute of Immunobiology and Epigenetics, 79108, Freiburg, Germany
- Medical Research Council (MRC), University of Cambridge, Cambridge, CB2 1QR, UK
| | - Serena Carra
- Centre for Neuroscience and Nanotechnology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, 41125, Modena, Italy.
| |
Collapse
|
10
|
Fauvet B, Finka A, Castanié-Cornet MP, Cirinesi AM, Genevaux P, Quadroni M, Goloubinoff P. Bacterial Hsp90 Facilitates the Degradation of Aggregation-Prone Hsp70-Hsp40 Substrates. Front Mol Biosci 2021; 8:653073. [PMID: 33937334 PMCID: PMC8082187 DOI: 10.3389/fmolb.2021.653073] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 03/17/2021] [Indexed: 01/27/2023] Open
Abstract
In eukaryotes, the 90-kDa heat shock proteins (Hsp90s) are profusely studied chaperones that, together with 70-kDa heat shock proteins (Hsp70s), control protein homeostasis. In bacteria, however, the function of Hsp90 (HtpG) and its collaboration with Hsp70 (DnaK) remains poorly characterized. To uncover physiological processes that depend on HtpG and DnaK, we performed comparative quantitative proteomic analyses of insoluble and total protein fractions from unstressed wild-type (WT) Escherichia coli and from knockout mutants ΔdnaKdnaJ (ΔKJ), ΔhtpG (ΔG), and ΔdnaKdnaJΔhtpG (ΔKJG). Whereas the ΔG mutant showed no detectable proteomic differences with wild-type, ΔKJ expressed more chaperones, proteases and ribosomes and expressed dramatically less metabolic and respiratory enzymes. Unexpectedly, we found that the triple mutant ΔKJG showed higher levels of metabolic and respiratory enzymes than ΔKJ, suggesting that bacterial Hsp90 mediates the degradation of aggregation-prone Hsp70-Hsp40 substrates. Further in vivo experiments suggest that such Hsp90-mediated degradation possibly occurs through the HslUV protease.
Collapse
Affiliation(s)
- Bruno Fauvet
- Department of Plant Molecular Biology (DBMV), University of Lausanne, Lausanne, Switzerland
| | - Andrija Finka
- Department of Ecology, Agronomy and Aquaculture, University of Zadar, Zadar, Croatia
| | - Marie-Pierre Castanié-Cornet
- Laboratoire de Microbiologie et de Génétique Moléculaires, Center de Biologie Intégrative, CNRS, Université de Toulouse, Toulouse, France
| | - Anne-Marie Cirinesi
- Laboratoire de Microbiologie et de Génétique Moléculaires, Center de Biologie Intégrative, CNRS, Université de Toulouse, Toulouse, France
| | - Pierre Genevaux
- Laboratoire de Microbiologie et de Génétique Moléculaires, Center de Biologie Intégrative, CNRS, Université de Toulouse, Toulouse, France
| | - Manfredo Quadroni
- Protein Analysis Facility, University of Lausanne, Lausanne, Switzerland
| | - Pierre Goloubinoff
- Department of Plant Molecular Biology (DBMV), University of Lausanne, Lausanne, Switzerland
| |
Collapse
|
11
|
Jud MC, Lowry J, Padilla T, Clifford E, Yang Y, Fennell F, Miller AK, Hamill D, Harvey AM, Avila-Zavala M, Shao H, Nguyen Tran N, Bao Z, Bowerman B. A genetic screen for temperature-sensitive morphogenesis-defective Caenorhabditis elegans mutants. G3-GENES GENOMES GENETICS 2021; 11:6169531. [PMID: 33713117 PMCID: PMC8133775 DOI: 10.1093/g3journal/jkab026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 01/18/2021] [Indexed: 11/21/2022]
Abstract
Morphogenesis involves coordinated cell migrations and cell shape changes that generate tissues and organs, and organize the body plan. Cell adhesion and the cytoskeleton are important for executing morphogenesis, but their regulation remains poorly understood. As genes required for embryonic morphogenesis may have earlier roles in development, temperature-sensitive embryonic-lethal mutations are useful tools for investigating this process. From a collection of ∼200 such Caenorhabditis elegans mutants, we have identified 17 that have highly penetrant embryonic morphogenesis defects after upshifts from the permissive to the restrictive temperature, just prior to the cell shape changes that mediate elongation of the ovoid embryo into a vermiform larva. Using whole genome sequencing, we identified the causal mutations in seven affected genes. These include three genes that have roles in producing the extracellular matrix, which is known to affect the morphogenesis of epithelial tissues in multicellular organisms: the rib-1 and rib-2 genes encode glycosyltransferases, and the emb-9 gene encodes a collagen subunit. We also used live imaging to characterize epidermal cell shape dynamics in one mutant, or1219ts, and observed cell elongation defects during dorsal intercalation and ventral enclosure that may be responsible for the body elongation defects. These results indicate that our screen has identified factors that influence morphogenesis and provides a platform for advancing our understanding of this fundamental biological process.
Collapse
Affiliation(s)
- Molly C Jud
- Institute of Molecular Biology, University of Oregon, Eugene, OR, 97402, USA
| | - Josh Lowry
- Institute of Molecular Biology, University of Oregon, Eugene, OR, 97402, USA
| | - Thalia Padilla
- Institute of Molecular Biology, University of Oregon, Eugene, OR, 97402, USA
| | - Erin Clifford
- Institute of Molecular Biology, University of Oregon, Eugene, OR, 97402, USA
| | - Yuqi Yang
- Institute of Molecular Biology, University of Oregon, Eugene, OR, 97402, USA
| | - Francesca Fennell
- Institute of Molecular Biology, University of Oregon, Eugene, OR, 97402, USA
| | - Alexander K Miller
- Institute of Molecular Biology, University of Oregon, Eugene, OR, 97402, USA
| | - Danielle Hamill
- Department of Zoology, Ohio Wesleyan University, Delaware, OH, 43015, USA
| | - Austin M Harvey
- Institute of Molecular Biology, University of Oregon, Eugene, OR, 97402, USA
| | - Martha Avila-Zavala
- Institute of Molecular Biology, University of Oregon, Eugene, OR, 97402, USA
| | - Hong Shao
- Developmental Biology Program, Sloan Kettering Institute, New York, NY, 10065, USA
| | - Nhan Nguyen Tran
- Developmental Biology Program, Sloan Kettering Institute, New York, NY, 10065, USA
| | - Zhirong Bao
- Developmental Biology Program, Sloan Kettering Institute, New York, NY, 10065, USA
| | - Bruce Bowerman
- Institute of Molecular Biology, University of Oregon, Eugene, OR, 97402, USA
| |
Collapse
|
12
|
Shemesh N, Jubran J, Dror S, Simonovsky E, Basha O, Argov C, Hekselman I, Abu-Qarn M, Vinogradov E, Mauer O, Tiago T, Carra S, Ben-Zvi A, Yeger-Lotem E. The landscape of molecular chaperones across human tissues reveals a layered architecture of core and variable chaperones. Nat Commun 2021; 12:2180. [PMID: 33846299 PMCID: PMC8042005 DOI: 10.1038/s41467-021-22369-9] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 02/23/2021] [Indexed: 12/13/2022] Open
Abstract
The sensitivity of the protein-folding environment to chaperone disruption can be highly tissue-specific. Yet, the organization of the chaperone system across physiological human tissues has received little attention. Through computational analyses of large-scale tissue transcriptomes, we unveil that the chaperone system is composed of core elements that are uniformly expressed across tissues, and variable elements that are differentially expressed to fit with tissue-specific requirements. We demonstrate via a proteomic analysis that the muscle-specific signature is functional and conserved. Core chaperones are significantly more abundant across tissues and more important for cell survival than variable chaperones. Together with variable chaperones, they form tissue-specific functional networks. Analysis of human organ development and aging brain transcriptomes reveals that these functional networks are established in development and decline with age. In this work, we expand the known functional organization of de novo versus stress-inducible eukaryotic chaperones into a layered core-variable architecture in multi-cellular organisms.
Collapse
Affiliation(s)
- Netta Shemesh
- Department of Clinical Biochemistry and Pharmacology and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva, Israel.,Department of Life Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Juman Jubran
- Department of Clinical Biochemistry and Pharmacology and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Shiran Dror
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Eyal Simonovsky
- Department of Clinical Biochemistry and Pharmacology and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Omer Basha
- Department of Clinical Biochemistry and Pharmacology and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Chanan Argov
- Department of Clinical Biochemistry and Pharmacology and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Idan Hekselman
- Department of Clinical Biochemistry and Pharmacology and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Mehtap Abu-Qarn
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Ekaterina Vinogradov
- Department of Clinical Biochemistry and Pharmacology and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Omry Mauer
- Department of Clinical Biochemistry and Pharmacology and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Tatiana Tiago
- Centre for Neuroscience and Nanotechnology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Serena Carra
- Centre for Neuroscience and Nanotechnology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Anat Ben-Zvi
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel.
| | - Esti Yeger-Lotem
- Department of Clinical Biochemistry and Pharmacology and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva, Israel.
| |
Collapse
|
13
|
Fauvet B, Finka A, Castanié-Cornet MP, Cirinesi AM, Genevaux P, Quadroni M, Goloubinoff P. Bacterial Hsp90 Facilitates the Degradation of Aggregation-Prone Hsp70-Hsp40 Substrates. Front Mol Biosci 2021. [PMID: 33937334 DOI: 10.1101/451989] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023] Open
Abstract
In eukaryotes, the 90-kDa heat shock proteins (Hsp90s) are profusely studied chaperones that, together with 70-kDa heat shock proteins (Hsp70s), control protein homeostasis. In bacteria, however, the function of Hsp90 (HtpG) and its collaboration with Hsp70 (DnaK) remains poorly characterized. To uncover physiological processes that depend on HtpG and DnaK, we performed comparative quantitative proteomic analyses of insoluble and total protein fractions from unstressed wild-type (WT) Escherichia coli and from knockout mutants ΔdnaKdnaJ (ΔKJ), ΔhtpG (ΔG), and ΔdnaKdnaJΔhtpG (ΔKJG). Whereas the ΔG mutant showed no detectable proteomic differences with wild-type, ΔKJ expressed more chaperones, proteases and ribosomes and expressed dramatically less metabolic and respiratory enzymes. Unexpectedly, we found that the triple mutant ΔKJG showed higher levels of metabolic and respiratory enzymes than ΔKJ, suggesting that bacterial Hsp90 mediates the degradation of aggregation-prone Hsp70-Hsp40 substrates. Further in vivo experiments suggest that such Hsp90-mediated degradation possibly occurs through the HslUV protease.
Collapse
Affiliation(s)
- Bruno Fauvet
- Department of Plant Molecular Biology (DBMV), University of Lausanne, Lausanne, Switzerland
| | - Andrija Finka
- Department of Ecology, Agronomy and Aquaculture, University of Zadar, Zadar, Croatia
| | - Marie-Pierre Castanié-Cornet
- Laboratoire de Microbiologie et de Génétique Moléculaires, Center de Biologie Intégrative, CNRS, Université de Toulouse, Toulouse, France
| | - Anne-Marie Cirinesi
- Laboratoire de Microbiologie et de Génétique Moléculaires, Center de Biologie Intégrative, CNRS, Université de Toulouse, Toulouse, France
| | - Pierre Genevaux
- Laboratoire de Microbiologie et de Génétique Moléculaires, Center de Biologie Intégrative, CNRS, Université de Toulouse, Toulouse, France
| | - Manfredo Quadroni
- Protein Analysis Facility, University of Lausanne, Lausanne, Switzerland
| | - Pierre Goloubinoff
- Department of Plant Molecular Biology (DBMV), University of Lausanne, Lausanne, Switzerland
| |
Collapse
|
14
|
Ewe CK, Alok G, Rothman JH. Stressful development: integrating endoderm development, stress, and longevity. Dev Biol 2020; 471:34-48. [PMID: 33307045 DOI: 10.1016/j.ydbio.2020.12.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2020] [Revised: 12/02/2020] [Accepted: 12/03/2020] [Indexed: 10/22/2022]
Abstract
In addition to performing digestion and nutrient absorption, the intestine serves as one of the first barriers to the external environment, crucial for protecting the host from environmental toxins, pathogenic invaders, and other stress inducers. The gene regulatory network (GRN) governing embryonic development of the endoderm and subsequent differentiation and maintenance of the intestine has been well-documented in C. elegans. A key regulatory input that initiates activation of the embryonic GRN for endoderm and mesoderm in this animal is the maternally provided SKN-1 transcription factor, an ortholog of the vertebrate Nrf1 and 2, which, like C. elegans SKN-1, perform conserved regulatory roles in mediating a variety of stress responses across metazoan phylogeny. Other key regulatory factors in early gut development also participate in stress response as well as in innate immunity and aging and longevity. In this review, we discuss the intersection between genetic nodes that mediate endoderm/intestine differentiation and regulation of stress and homeostasis. We also consider how direct signaling from the intestine to the germline, in some cases involving SKN-1, facilitates heritable epigenetic changes, allowing transmission of adaptive stress responses across multiple generations. These connections between regulation of endoderm/intestine development and stress response mechanisms suggest that varying selective pressure exerted on the stress response pathways may influence the architecture of the endoderm GRN, thereby leading to genetic and epigenetic variation in early embryonic GRN regulatory events.
Collapse
Affiliation(s)
- Chee Kiang Ewe
- Department of MCD Biology and Neuroscience Research Institute, University of California Santa Barbara, Santa Barbara, CA, USA.
| | - Geneva Alok
- Department of MCD Biology and Neuroscience Research Institute, University of California Santa Barbara, Santa Barbara, CA, USA.
| | - Joel H Rothman
- Department of MCD Biology and Neuroscience Research Institute, University of California Santa Barbara, Santa Barbara, CA, USA.
| |
Collapse
|
15
|
Guan G, Fang M, Wong MK, Ho VWS, An X, Tang C, Huang X, Zhao Z. Multilevel regulation of muscle-specific transcription factor hlh-1 during Caenorhabditis elegans embryogenesis. Dev Genes Evol 2020; 230:265-278. [PMID: 32556563 PMCID: PMC7371654 DOI: 10.1007/s00427-020-00662-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Accepted: 05/31/2020] [Indexed: 11/29/2022]
Abstract
hlh-1 is a myogenic transcription factor required for body-wall muscle specification during embryogenesis in Caenorhabditis elegans. Despite its well-known role in muscle specification, comprehensive regulatory control upstream of hlh-1 remains poorly defined. Here, we first established a statistical reference for the spatiotemporal expression of hlh-1 at single-cell resolution up to the second last round of divisions for most of the cell lineages (from 4- to 350-cell stage) using 13 wild-type embryos. We next generated lineal expression of hlh-1 after RNA interference (RNAi) perturbation of 65 genes, which were selected based on their degree of conservation, mutant phenotypes, and known roles in development. We then compared the expression profiles between wild-type and RNAi embryos by clustering according to their lineal expression patterns using mean-shift and density-based clustering algorithms, which not only confirmed the roles of existing genes but also uncovered the potential functions of novel genes in muscle specification at multiple levels, including cellular, lineal, and embryonic levels. By combining the public data on protein-protein interactions, protein-DNA interactions, and genetic interactions with our RNAi data, we inferred regulatory pathways upstream of hlh-1 that function globally or locally. This work not only revealed diverse and multilevel regulatory mechanisms coordinating muscle differentiation during C. elegans embryogenesis but also laid a foundation for further characterizing the regulatory pathways controlling muscle specification at the cellular, lineal (local), or embryonic (global) level.
Collapse
Affiliation(s)
- Guoye Guan
- Center for Quantitative Biology, Peking University, Beijing, 100871, China
| | - Meichen Fang
- School of Life Sciences, Peking University, Beijing, 100871, China
| | - Ming-Kin Wong
- Department of Biology, Hong Kong Baptist University, Hong Kong, 999077, China
| | - Vincy Wing Sze Ho
- Department of Biology, Hong Kong Baptist University, Hong Kong, 999077, China
| | - Xiaomeng An
- Department of Biology, Hong Kong Baptist University, Hong Kong, 999077, China
| | - Chao Tang
- Center for Quantitative Biology, Peking University, Beijing, 100871, China
- Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100871, China
- School of Physics, Peking University, Beijing, 100871, China
| | - Xiaotai Huang
- School of Computer Science and Technology, Xidian University, Xi'an, 710126, Shaanxi, China.
| | - Zhongying Zhao
- Department of Biology, Hong Kong Baptist University, Hong Kong, 999077, China.
- State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Hong Kong, 999077, China.
| |
Collapse
|
16
|
Morimoto RI. Cell-Nonautonomous Regulation of Proteostasis in Aging and Disease. Cold Spring Harb Perspect Biol 2020; 12:cshperspect.a034074. [PMID: 30962274 DOI: 10.1101/cshperspect.a034074] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The functional health of the proteome is determined by properties of the proteostasis network (PN) that regulates protein synthesis, folding, macromolecular assembly, translocation, and degradation. In eukaryotes, the PN also integrates protein biogenesis across compartments within the cell and between tissues of metazoans for organismal health and longevity. Additionally, in metazoans, proteome stability and the functional health of proteins is optimized for development and yet declines throughout aging, accelerating the risk for misfolding, aggregation, and cellular dysfunction. Here, I describe the cell-nonautonomous regulation of organismal PN by tissue communication and cell stress-response pathways. These systems are robust from development through reproductive maturity and are genetically programmed to decline abruptly in early adulthood by repression of the heat shock response and other cell-protective stress responses, thus compromising the ability of cells and tissues to properly buffer against the cumulative stress of protein damage during aging. While the failure of multiple protein quality control processes during aging challenges cellular function and tissue health, genetic studies, and the identification of small-molecule proteostasis regulators suggests strategies that can be employed to reset the PN with potential benefit on cellular health and organismal longevity.
Collapse
Affiliation(s)
- Richard I Morimoto
- Department of Molecular Biosciences, Rice Institute for Biomedical Research, Northwestern University, Evanston, Illinois 60208
| |
Collapse
|
17
|
Galai G, Ben-David H, Levin L, Orth MF, Grünewald TGP, Pilosof S, Bershtein S, Rotblat B. Pan-Cancer Analysis of Mitochondria Chaperone-Client Co-Expression Reveals Chaperone Functional Partitioning. Cancers (Basel) 2020; 12:cancers12040825. [PMID: 32235444 PMCID: PMC7226338 DOI: 10.3390/cancers12040825] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 03/20/2020] [Accepted: 03/25/2020] [Indexed: 12/26/2022] Open
Abstract
Metabolic reprogramming is a hallmark of cancer. Such reprogramming entails the up-regulation of the expression of specific mitochondrial proteins, thus increasing the burden on the mitochondrial protein quality control. However, very little is known about the specificity of interactions between mitochondrial chaperones and their clients, or to what extent the mitochondrial chaperone–client co-expression is coordinated. We hypothesized that a physical interaction between a chaperone and its client in mitochondria ought to be manifested in the co-expression pattern of both transcripts. Using The Cancer Genome Atlas (TCGA) gene expression data from 13 tumor entities, we constructed the mitochondrial chaperone-client co-expression network. We determined that the network is comprised of three distinct modules, each populated with unique chaperone-clients co-expression pairs belonging to distinct functional groups. Surprisingly, chaperonins HSPD1 and HSPE1, which are known to comprise a functional complex, each occupied a different module: HSPD1 co-expressed with tricarboxylic acid cycle cycle enzymes, while HSPE1 co-expressed with proteins involved in oxidative phosphorylation. Importantly, we found that the genes in each module were enriched for discrete transcription factor binding sites, suggesting the mechanism for the coordinated co-expression. We propose that our mitochondrial chaperone–client interactome can facilitate the identification of chaperones supporting specific mitochondrial pathways and bring forth a fundamental principle in metabolic adaptation.
Collapse
Affiliation(s)
- Geut Galai
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer Sheva 8410501, Israel; (G.G.); (S.P.)
- The National Institute for Biotechnology in the Negev, Beer Sheva 8410501, Israel;
| | - Hila Ben-David
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer Sheva 8410501, Israel; (G.G.); (S.P.)
- The National Institute for Biotechnology in the Negev, Beer Sheva 8410501, Israel;
| | - Liron Levin
- The National Institute for Biotechnology in the Negev, Beer Sheva 8410501, Israel;
| | - Martin F. Orth
- Max-Eder Research Group for Pediatric Sarcoma Biology, Institute of Pathology of the LMU Munich, 80337 Munich, Germany; (M.F.O.); (T.G.P.G.)
| | - Thomas G. P. Grünewald
- Max-Eder Research Group for Pediatric Sarcoma Biology, Institute of Pathology of the LMU Munich, 80337 Munich, Germany; (M.F.O.); (T.G.P.G.)
- Institute of Pathology of the LMU Munich, 80337 Munich, Germany
- Division of Translational Pediatric Sarcoma Research, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
- Hopp Children’s Cancer Center Heidelberg (KiTZ), 69120 Heidelberg, Germany
- German Cancer Consortium (DKTK), 69120 Heidelberg, Germany
| | - Shai Pilosof
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer Sheva 8410501, Israel; (G.G.); (S.P.)
| | - Shimon Bershtein
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer Sheva 8410501, Israel; (G.G.); (S.P.)
- Correspondence: (S.B.); (B.R.)
| | - Barak Rotblat
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer Sheva 8410501, Israel; (G.G.); (S.P.)
- The National Institute for Biotechnology in the Negev, Beer Sheva 8410501, Israel;
- Correspondence: (S.B.); (B.R.)
| |
Collapse
|
18
|
O'Brien D, Jones LM, Good S, Miles J, Vijayabaskar MS, Aston R, Smith CE, Westhead DR, van Oosten-Hawle P. A PQM-1-Mediated Response Triggers Transcellular Chaperone Signaling and Regulates Organismal Proteostasis. Cell Rep 2019; 23:3905-3919. [PMID: 29949773 PMCID: PMC6045774 DOI: 10.1016/j.celrep.2018.05.093] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 05/04/2018] [Accepted: 05/30/2018] [Indexed: 12/12/2022] Open
Abstract
In metazoans, tissues experiencing proteotoxic stress induce "transcellular chaperone signaling" (TCS) that activates molecular chaperones, such as hsp-90, in distal tissues. How this form of inter-tissue communication is mediated to upregulate systemic chaperone expression and whether it can be utilized to protect against protein misfolding diseases remain open questions. Using C. elegans, we identified key components of a systemic stress signaling pathway that links the innate immune response with proteostasis maintenance. We show that mild perturbation of proteostasis in the neurons or the intestine activates TCS via the GATA zinc-finger transcription factor PQM-1. PQM-1 coordinates neuron-activated TCS via the innate immunity-associated transmembrane protein CLEC-41, whereas intestine-activated TCS depends on the aspartic protease ASP-12. Both TCS pathways can induce hsp-90 in muscle cells and facilitate amelioration of Aβ3-42-associated toxicity. This may have powerful implications for the treatment of diseases related to proteostasis dysfunction.
Collapse
Affiliation(s)
- Daniel O'Brien
- School of Molecular and Cell Biology and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, UK
| | - Laura M Jones
- School of Molecular and Cell Biology and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, UK
| | - Sarah Good
- School of Molecular and Cell Biology and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, UK
| | - Jo Miles
- School of Molecular and Cell Biology and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, UK
| | - M S Vijayabaskar
- School of Molecular and Cell Biology and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, UK
| | - Rebecca Aston
- School of Molecular and Cell Biology and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, UK
| | - Catrin E Smith
- School of Molecular and Cell Biology and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, UK
| | - David R Westhead
- School of Molecular and Cell Biology and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, UK
| | - Patricija van Oosten-Hawle
- School of Molecular and Cell Biology and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, UK.
| |
Collapse
|
19
|
Boczek E, Gaglia G, Olshina M, Sarraf S. The first Autumn School on Proteostasis: from molecular mechanisms to organismal consequences. Cell Stress Chaperones 2019; 24:481-492. [PMID: 31073902 PMCID: PMC6527634 DOI: 10.1007/s12192-019-00998-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/15/2019] [Indexed: 12/12/2022] Open
Abstract
The first Autumn School on Proteostasis was held at the Mediterranean Institute for Life Sciences (MedILS) in Split, Croatia, from November 12th-16th, 2018, bringing together 44 graduate students and postdoctoral fellows and 22 principal investigators from around the world. This meeting was geared towards providing students with an in-depth understanding of the field of proteostasis, with the aim of broadening their perspectives of the field. Session topics covered multiple aspects of cellular and organismal proteostasis, including fundamental principles, responses to heat shock, aging and disease, and protein folding, misfolding, and degradation. The structure of the meeting and the restricted number of participants afforded the students and postdocs the opportunity to interact with principal investigators to discuss not only their latest research, but also their career prospects and progression in a close, supportive environment.
Collapse
Affiliation(s)
- Edgar Boczek
- Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany
| | - Giorgio Gaglia
- Brigham Women’s Hospital, Harvard Medical School, Boston, MA USA
| | - Maya Olshina
- Department of Biomolecular Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Shireen Sarraf
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD USA
| |
Collapse
|
20
|
Shpigel N, Shemesh N, Kishner M, Ben-Zvi A. Dietary restriction and gonadal signaling differentially regulate post-development quality control functions in Caenorhabditis elegans. Aging Cell 2019; 18:e12891. [PMID: 30648346 PMCID: PMC6413660 DOI: 10.1111/acel.12891] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Revised: 09/27/2018] [Accepted: 11/03/2018] [Indexed: 01/03/2023] Open
Abstract
Protein homeostasis is remodeled early in Caenorhabditis elegans adulthood, resulting in a sharp decline in folding capacity and reduced ability to cope with chronic and acute stress. Endocrine signals from the reproductive system can ameliorate this proteostatic collapse and reshape the quality control network. Given that environmental conditions, such as food availability, impact reproductive success, we asked whether conditions of dietary restriction (DR) can also reverse the decline in quality control function at the transition to adulthood, and if so, whether gonadal signaling and dietary signaling remodel the quality control network in a similar or different manner. For this, we employed the eat-2 genetic model and bacterial deprivation protocol. We found that animals under DR maintained heat shock response activation and high protein folding capacity during adulthood. However, while gonadal signaling required DAF-16, DR-associated rescue of quality control functions required the antagonistic transcription factor, PQM-1. Bioinformatic analyses supported a role for DAF-16 in acute stress responses and a role for PQM-1 in cellular maintenance and chronic stress. Comparing the stress activation and folding capacities of dietary- and gonadal-signaling mutant animals confirmed this prediction and demonstrated that each differentially impacts cellular quality control capabilities. These data suggest that the functional mode of cellular quality control networks can be differentially remodeled, affecting an organism's ability to respond to acute and chronic stresses during adulthood.
Collapse
Affiliation(s)
- Nufar Shpigel
- Department of Life Sciences, The National Institute for Biotechnology in the Negev; Ben-Gurion University of the Negev; Beer Sheva Israel
| | - Netta Shemesh
- Department of Life Sciences, The National Institute for Biotechnology in the Negev; Ben-Gurion University of the Negev; Beer Sheva Israel
| | - Mor Kishner
- Department of Life Sciences, The National Institute for Biotechnology in the Negev; Ben-Gurion University of the Negev; Beer Sheva Israel
| | - Anat Ben-Zvi
- Department of Life Sciences, The National Institute for Biotechnology in the Negev; Ben-Gurion University of the Negev; Beer Sheva Israel
| |
Collapse
|
21
|
Zha J, Ying M, Alexander-Floyd J, Gidalevitz T. HSP-4/BiP expression in secretory cells is regulated by a developmental program and not by the unfolded protein response. PLoS Biol 2019; 17:e3000196. [PMID: 30908491 PMCID: PMC6448932 DOI: 10.1371/journal.pbio.3000196] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 04/04/2019] [Accepted: 03/11/2019] [Indexed: 12/18/2022] Open
Abstract
Differentiation of secretory cells leads to sharp increases in protein synthesis, challenging endoplasmic reticulum (ER) proteostasis. Anticipatory activation of the unfolded protein response (UPR) prepares cells for the onset of secretory function by expanding the ER size and folding capacity. How cells ensure that the repertoire of induced chaperones matches their postdifferentiation folding needs is not well understood. We find that during differentiation of stem-like seam cells, a typical UPR target, the Caenorhabditis elegans immunoglobulin heavy chain-binding protein (BiP) homologue Heat-Shock Protein 4 (HSP-4), is selectively induced in alae-secreting daughter cells but is repressed in hypodermal daughter cells. Surprisingly, this lineage-dependent induction bypasses the requirement for UPR signaling. Instead, its induction in alae-secreting cells is controlled by a specific developmental program, while its repression in the hypodermal-fated cells requires a transcriptional regulator B-Lymphocyte–Induced Maturation Protein 1 (BLMP-1/BLIMP1), involved in differentiation of mammalian secretory cells. The HSP-4 induction is anticipatory and is required for the integrity of secreted alae. Thus, differentiation programs can directly control a broad-specificity chaperone that is normally stress dependent to ensure the integrity of secreted proteins. A study in the nematode Caenorhabditis elegans shows that dedicated developmental programs can bypass the requirements for the unfolded protein response during the differentiation of secretory cells, anticipating their future high folding needs. During differentiation, cells that specialize in secretion of proteins, such as antibody-secreting B cells, prepare for the onset of secretory function by expanding the size of the major secretory organelle, the endoplasmic reticulum (ER), and by increasing the expression of molecular chaperones and folding enzymes. This pre-emptive expansion of the ER depends on activation of the ER stress response pathways and is required for the secretory phenotype. In addition, cells may also need to up-regulate a selected subset of chaperones because different secreted proteins may require different chaperones for their folding and secretion. Except in specialized cases, how this selective up-regulation is achieved, and whether it depends on the ER stress pathways, is not well understood. Using Caenorhabditis elegans, we find that a chaperone BiP/HSP-4, which is usually induced in most cells by stress, is selectively induced during differentiation of stem cells into the alae-secreting cells while being repressed in their sister lineage, the hypodermal cells. We find that induction of this chaperone is independent of the known ER stress pathways, while its repression requires a known regulator of development in mammals, BLIMP1/BLMP-1. The pre-emptive induction of BiP/HSP-4 is important for the integrity of secreted alae and cuticle, suggesting that a general molecular chaperone that is a canonical target of ER stress pathways can be selectively regulated by development to ensure the quality of secreted proteome and functionality of the cells postdifferentiation.
Collapse
Affiliation(s)
- Ji Zha
- Biology Department, Drexel University, Philadelphia, Pennsylvania, United States of America
| | - Mingjie Ying
- Biology Department, Drexel University, Philadelphia, Pennsylvania, United States of America
| | | | - Tali Gidalevitz
- Biology Department, Drexel University, Philadelphia, Pennsylvania, United States of America
- * E-mail:
| |
Collapse
|
22
|
Pradhan A, Olsson PE, Jass J. Di(2-ethylhexyl) phthalate and diethyl phthalate disrupt lipid metabolism, reduce fecundity and shortens lifespan of Caenorhabditis elegans. CHEMOSPHERE 2018; 190:375-382. [PMID: 29020644 DOI: 10.1016/j.chemosphere.2017.09.123] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 09/13/2017] [Accepted: 09/26/2017] [Indexed: 05/22/2023]
Abstract
The widespread use of phthalates is of major concern as they have adverse effects on many different physiological functions, including reproduction, metabolism and cell differentiation. The aim of this study was to compare the toxicity of the widely-used di (2-ethydlhexyl) phthalate (DEHP) with its substitute, diethyl phthalate (DEP). We analyzed the toxicity of these two phthalates using Caenorhabditis elegans as a model system. Gene expression analysis following exposure during the L1 to young adult stage showed that DEHP and DEP alter the expression of genes involved in lipid metabolism and stress response. Genes associated with lipid metabolism, including fasn-1, pod-2, fat-5, acs-6 and sbp-1, and vitellogenin were upregulated. Among the stress response genes, ced-1 wah-1, daf-21 and gst-4 were upregulated, while ctl-1, cdf-2 and the heat shock proteins (hsp-16.1, hsp-16.48 and sip-1) were downregulated. Lipid staining revealed that DEHP significantly increased lipid content following 1 μM exposure, however, DEP required 10 μM exposure to elicit an effect. Both DEHP and DEP reduced the fecundity at 1 μM concentration. Lifespan analysis indicated that DEHP and DEP reduced the average lifespan from 14 days in unexposed worms to 13 and 12 days, respectively. Expression of lifespan associated genes showed a correlation to shortened lifespan in the exposed groups. As reported previously, our data also indicates that the banned DEHP is toxic to C. elegans, however its substitute DEP has not been previously tested in this model organism and our data revealed that DEP is equally potent as DEHP in regulating C. elegans physiological functions.
Collapse
Affiliation(s)
- Ajay Pradhan
- Biology, the Life Science Center, School of Science and Technology, Örebro University, SE-701 82 Örebro, Sweden.
| | - Per-Erik Olsson
- Biology, the Life Science Center, School of Science and Technology, Örebro University, SE-701 82 Örebro, Sweden
| | - Jana Jass
- Biology, the Life Science Center, School of Science and Technology, Örebro University, SE-701 82 Örebro, Sweden
| |
Collapse
|
23
|
Hsp90-downregulation influences the heat-shock response, innate immune response and onset of oocyte development in nematodes. PLoS One 2017; 12:e0186386. [PMID: 29078207 PMCID: PMC5659845 DOI: 10.1371/journal.pone.0186386] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Accepted: 09/30/2017] [Indexed: 01/21/2023] Open
Abstract
Hsp90 is a molecular chaperone involved in the regulation and maturation of kinases and transcription factors. In Caenorhabditis elegans, it contributes to the development of fertility, maintenance of muscle structure, the regulation of heat-shock response and dauer state. To understand the consequences of Hsp90-depletion, we studied Hsp90 RNAi-treated nematodes by DNA microarrays and mass spectrometry. We find that upon development of phenotypes the levels of chaperones and Hsp90 cofactors are increased, while specific proteins related to the innate immune response are depleted. In microarrays, we further find many differentially expressed genes related to gonad and larval development. These genes form an expression cluster that is regulated independently from the immune response implying separate pathways of Hsp90-involvement. Using fluorescent reporter strains for the differentially expressed immune response genes skr-5, dod-24 and clec-60 we observe that their activity in intestinal tissues is influenced by Hsp90-depletion. Instead, effects on the development are evident in both gonad arms. After Hsp90-depletion, changes can be observed in early embryos and adults containing fluorescence-tagged versions of SEPA-1, CAV-1 or PUD-1, all of which are downregulated after Hsp90-depletion. Our observations identify molecular events for Hsp90-RNAi induced phenotypes during development and immune responses, which may help to separately investigate independent Hsp90-influenced processes that are relevant during the nematode’s life and development.
Collapse
|
24
|
Shemesh N, Meshnik L, Shpigel N, Ben-Zvi A. Dietary-Induced Signals That Activate the Gonadal Longevity Pathway during Development Regulate a Proteostasis Switch in Caenorhabditis elegans Adulthood. Front Mol Neurosci 2017; 10:254. [PMID: 28848390 PMCID: PMC5552676 DOI: 10.3389/fnmol.2017.00254] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 07/27/2017] [Indexed: 12/13/2022] Open
Abstract
Cell-non-autonomous signals dictate the functional state of cellular quality control systems, remodeling the ability of cells to cope with stress and maintain protein homeostasis (proteostasis). One highly regulated cell-non-autonomous switch controls proteostatic capacity in Caenorhabditis elegans adulthood. Signals from the reproductive system down-regulate cyto-protective pathways, unless countered by signals reporting on germline proliferation disruption. Here, we utilized dihomo-γ-linolenic acid (DGLA) that depletes the C. elegans germline to ask when cell-non-autonomous signals from the reproductive system determine somatic proteostasis and whether such regulation is reversible. We found that diet supplementation of DGLA resulted in the maintenance of somatic proteostasis after the onset of reproduction. DGLA-dependent proteostasis remodeling was only effective if animals were exposed to DGLA during larval development. A short exposure of 16 h during the second to fourth larval stages was sufficient and required to maintain somatic proteostasis in adulthood but not to extend lifespan. The reproductive system was required for DGLA-dependent remodeling of proteostasis in adulthood, likely via DGLA-dependent disruption of germline stem cells. However, arachidonic acid (AA), a somatic regulator of this pathway that does not require the reproductive system, presented similar regulatory timing. Finally, we showed that DGLA- and AA-supplementation led to activation of the gonadal longevity pathway but presented differential regulatory timing. Proteostasis and stress response regulators, including hsf-1 and daf-16, were only activated if exposed to DGLA and AA during development, while other gonadal longevity factors did not show this regulatory timing. We propose that C. elegans determines its proteostatic fate during development and is committed to either reproduction, and thus present restricted proteostasis, or survival, and thus present robust proteostasis. Given the critical role of proteostatic networks in the onset and progression of many aging-related diseases, such a choice could impact susceptibility to protein misfolding diseases later in life.
Collapse
Affiliation(s)
- Netta Shemesh
- Department of Life Sciences, The National Institute for Biotechnology in the NegevBen-Gurion University of the Negev, Beer Sheva, Israel
| | - Lana Meshnik
- Department of Life Sciences, The National Institute for Biotechnology in the NegevBen-Gurion University of the Negev, Beer Sheva, Israel
| | - Nufar Shpigel
- Department of Life Sciences, The National Institute for Biotechnology in the NegevBen-Gurion University of the Negev, Beer Sheva, Israel
| | - Anat Ben-Zvi
- Department of Life Sciences, The National Institute for Biotechnology in the NegevBen-Gurion University of the Negev, Beer Sheva, Israel
| |
Collapse
|
25
|
Shemesh N, Shai N, Meshnik L, Katalan R, Ben-Zvi A. Uncoupling the Trade-Off between Somatic Proteostasis and Reproduction in Caenorhabditis elegans Models of Polyglutamine Diseases. Front Mol Neurosci 2017; 10:101. [PMID: 28503130 PMCID: PMC5409330 DOI: 10.3389/fnmol.2017.00101] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Accepted: 03/24/2017] [Indexed: 12/17/2022] Open
Abstract
Caenorhabditis elegans somatic protein homeostasis (proteostasis) is actively remodeled at the onset of reproduction. This proteostatic collapse is regulated cell-nonautonomously by signals from the reproductive system that transmit the commitment to reproduction to somatic cells. Here, we asked whether the link between the reproductive system and somatic proteostasis could be uncoupled by activating downstream effectors in the gonadal longevity cascade. Specifically, we examined whether over-expression of lipl-4 (lipl-4(oe)), a target gene of the gonadal longevity pathway, or increase in arachidonic acid (AA) levels, associated with lipl-4(oe), modulated proteostasis and reproduction. We found that lipl-4(oe) rescued somatic proteostasis and postponed the onset of aggregation and toxicity in C. elegans models of polyglutamine (polyQ) diseases. However, lipl-4(oe) also disrupted fatty acid transport into developing oocytes and reduced reproductive success. In contrast, diet supplementation of AA recapitulated lipl-4(oe)-mediated proteostasis enhancement in wild type animals but did not affect the reproductive system. Thus, the gonadal longevity pathway mediates a trade-off between somatic maintenance and reproduction, in part by regulating the expression of genes, such as lipl-4, with inverse effects on somatic maintenance and reproduction. We propose that AA could uncouple such germline to soma crosstalk, with beneficial implications protein misfolding diseases.
Collapse
Affiliation(s)
- Netta Shemesh
- Department of Life Sciences, The National Institute for Biotechnology in the Negev, Ben-Gurion University of the NegevBeer Sheva, Israel
| | - Nadav Shai
- Department of Life Sciences, The National Institute for Biotechnology in the Negev, Ben-Gurion University of the NegevBeer Sheva, Israel
| | - Lana Meshnik
- Department of Life Sciences, The National Institute for Biotechnology in the Negev, Ben-Gurion University of the NegevBeer Sheva, Israel
| | - Rotem Katalan
- Department of Life Sciences, The National Institute for Biotechnology in the Negev, Ben-Gurion University of the NegevBeer Sheva, Israel
| | - Anat Ben-Zvi
- Department of Life Sciences, The National Institute for Biotechnology in the Negev, Ben-Gurion University of the NegevBeer Sheva, Israel
| |
Collapse
|
26
|
Sala AJ, Bott LC, Morimoto RI. Shaping proteostasis at the cellular, tissue, and organismal level. J Cell Biol 2017; 216:1231-1241. [PMID: 28400444 PMCID: PMC5412572 DOI: 10.1083/jcb.201612111] [Citation(s) in RCA: 157] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 03/20/2017] [Accepted: 03/20/2017] [Indexed: 01/22/2023] Open
Abstract
The proteostasis network (PN) regulates protein synthesis, folding, transport, and degradation to maintain proteome integrity and limit the accumulation of protein aggregates, a hallmark of aging and degenerative diseases. In multicellular organisms, the PN is regulated at the cellular, tissue, and systemic level to ensure organismal health and longevity. Here we review these three layers of PN regulation and examine how they collectively maintain cellular homeostasis, achieve cell type-specific proteomes, and coordinate proteostasis across tissues. A precise understanding of these layers of control has important implications for organismal health and could offer new therapeutic approaches for neurodegenerative diseases and other chronic disorders related to PN dysfunction.
Collapse
Affiliation(s)
- Ambre J Sala
- Department of Molecular Biosciences, Rice Institute for Biomedical Research, Northwestern University, Evanston, IL 60208
| | - Laura C Bott
- Department of Molecular Biosciences, Rice Institute for Biomedical Research, Northwestern University, Evanston, IL 60208
| | - Richard I Morimoto
- Department of Molecular Biosciences, Rice Institute for Biomedical Research, Northwestern University, Evanston, IL 60208
| |
Collapse
|