101
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Uncoupling Stress-Inducible Phosphorylation of Heat Shock Factor 1 from Its Activation. Mol Cell Biol 2015; 35:2530-40. [PMID: 25963659 DOI: 10.1128/mcb.00816-14] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2014] [Accepted: 05/04/2015] [Indexed: 12/31/2022] Open
Abstract
In mammals the stress-inducible expression of genes encoding heat shock proteins is under the control of the heat shock transcription factor 1 (HSF1). Activation of HSF1 is a multistep process, involving trimerization, acquisition of DNA-binding and transcriptional activities, which coincide with several posttranslational modifications. Stress-inducible phosphorylation of HSF1, or hyperphosphorylation, which occurs mainly within the regulatory domain (RD), has been proposed as a requirement for HSF-driven transcription and is widely used for assessing HSF1 activation. Nonetheless, the contribution of hyperphosphorylation to the activity of HSF1 remains unknown. In this study, we generated a phosphorylation-deficient HSF1 mutant (HSF1Δ∼PRD), where the 15 known phosphorylation sites within the RD were disrupted. Our results show that the phosphorylation status of the RD does not affect the subcellular localization and DNA-binding activity of HSF1. Surprisingly, under stress conditions, HSF1Δ∼PRD is a potent transactivator of both endogenous targets and a reporter gene, and HSF1Δ∼PRD has a reduced activation threshold. Our results provide the first direct evidence for uncoupling stress-inducible phosphorylation of HSF1 from its activation, and we propose that the phosphorylation signature alone is not an appropriate marker for HSF1 activity.
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102
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Kourtis N, Moubarak RS, Aranda-Orgilles B, Lui K, Aydin IT, Trimarchi T, Darvishian F, Salvaggio C, Zhong J, Bhatt K, Chen EI, Celebi JT, Lazaris C, Tsirigos A, Osman I, Hernando E, Aifantis I. FBXW7 modulates cellular stress response and metastatic potential through HSF1 post-translational modification. Nat Cell Biol 2015; 17:322-332. [PMID: 25720964 PMCID: PMC4401662 DOI: 10.1038/ncb3121] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Accepted: 01/20/2015] [Indexed: 12/30/2022]
Abstract
Heat-shock factor 1 (HSF1) orchestrates the heat-shock response in eukaryotes. Although this pathway has been evolved to help cells adapt in the presence of challenging conditions, it is co-opted in cancer to support malignancy. However, the mechanisms that regulate HSF1 and thus cellular stress response are poorly understood. Here we show that the ubiquitin ligase FBXW7 α interacts with HSF1 through a conserved motif phosphorylated by GSK3β and ERK1. FBXW7α ubiquitylates HSF1 and loss of FBXW7α results in impaired degradation of nuclear HSF1 and defective heat-shock response attenuation. FBXW7α is either mutated or transcriptionally downregulated in melanoma and HSF1 nuclear stabilization correlates with increased metastatic potential and disease progression. FBXW7α deficiency and subsequent HSF1 accumulation activates an invasion-supportive transcriptional program and enhances the metastatic potential of human melanoma cells. These findings identify a post-translational mechanism of regulation of the HSF1 transcriptional program both in the presence of exogenous stress and in cancer.
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Affiliation(s)
- Nikos Kourtis
- Howard Hughes Medical Institute and Department of Pathology, NYU School of Medicine, New York, NY 10016, USA.,NYU Cancer Institute and Helen L. and Martin S. Kimmel Center for Stem Cell Biology, NYU School of Medicine, New York, NY 10016, USA
| | - Rana S Moubarak
- Department of Pathology, NYU School of Medicine, New York, NY 10016, USA.,Interdisciplinary Melanoma Cooperative Group, NYU Cancer Institute, New York, NY 10016, USA
| | - Beatriz Aranda-Orgilles
- Howard Hughes Medical Institute and Department of Pathology, NYU School of Medicine, New York, NY 10016, USA.,NYU Cancer Institute and Helen L. and Martin S. Kimmel Center for Stem Cell Biology, NYU School of Medicine, New York, NY 10016, USA
| | - Kevin Lui
- Interdisciplinary Melanoma Cooperative Group, NYU Cancer Institute, New York, NY 10016, USA.,Ronald O. Perelman Department of Dermatology, NYU School of Medicine, New York, New York, NY 10016, USA
| | - Iraz T Aydin
- Departments of Pathology and Dermatology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Thomas Trimarchi
- Howard Hughes Medical Institute and Department of Pathology, NYU School of Medicine, New York, NY 10016, USA.,NYU Cancer Institute and Helen L. and Martin S. Kimmel Center for Stem Cell Biology, NYU School of Medicine, New York, NY 10016, USA
| | - Farbod Darvishian
- Department of Pathology, NYU School of Medicine, New York, NY 10016, USA.,Interdisciplinary Melanoma Cooperative Group, NYU Cancer Institute, New York, NY 10016, USA
| | - Christine Salvaggio
- Interdisciplinary Melanoma Cooperative Group, NYU Cancer Institute, New York, NY 10016, USA.,Ronald O. Perelman Department of Dermatology, NYU School of Medicine, New York, New York, NY 10016, USA
| | - Judy Zhong
- Interdisciplinary Melanoma Cooperative Group, NYU Cancer Institute, New York, NY 10016, USA.,Department of Population Health, New York University School of Medicine, New York, New York.,Department of Environmental Medicine, New York University School of Medicine, New York, New York
| | - Kamala Bhatt
- Howard Hughes Medical Institute and Department of Pathology, NYU School of Medicine, New York, NY 10016, USA.,NYU Cancer Institute and Helen L. and Martin S. Kimmel Center for Stem Cell Biology, NYU School of Medicine, New York, NY 10016, USA
| | - Emily I Chen
- The Herbert Irving Comprehensive Cancer Center, Department of Pharmacology, Columbia University Medical Center, New York, NY 10032, USA
| | - Julide T Celebi
- Departments of Pathology and Dermatology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Charalampos Lazaris
- Howard Hughes Medical Institute and Department of Pathology, NYU School of Medicine, New York, NY 10016, USA.,NYU Cancer Institute and Helen L. and Martin S. Kimmel Center for Stem Cell Biology, NYU School of Medicine, New York, NY 10016, USA.,Center for Health Informatics and Bioinformatics, NYU School of Medicine, NY 10016, USA
| | - Aristotelis Tsirigos
- Howard Hughes Medical Institute and Department of Pathology, NYU School of Medicine, New York, NY 10016, USA.,Center for Health Informatics and Bioinformatics, NYU School of Medicine, NY 10016, USA
| | - Iman Osman
- Interdisciplinary Melanoma Cooperative Group, NYU Cancer Institute, New York, NY 10016, USA.,Ronald O. Perelman Department of Dermatology, NYU School of Medicine, New York, New York, NY 10016, USA
| | - Eva Hernando
- Department of Pathology, NYU School of Medicine, New York, NY 10016, USA.,Interdisciplinary Melanoma Cooperative Group, NYU Cancer Institute, New York, NY 10016, USA
| | - Iannis Aifantis
- Howard Hughes Medical Institute and Department of Pathology, NYU School of Medicine, New York, NY 10016, USA.,NYU Cancer Institute and Helen L. and Martin S. Kimmel Center for Stem Cell Biology, NYU School of Medicine, New York, NY 10016, USA
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103
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Transcriptional Response to Acute Thermal Exposure in Juvenile Chinook Salmon Determined by RNAseq. G3-GENES GENOMES GENETICS 2015; 5:1335-49. [PMID: 25911227 PMCID: PMC4502368 DOI: 10.1534/g3.115.017699] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Thermal exposure is a serious and growing challenge facing fish species worldwide. Chinook salmon (Oncorhynchus tshawytscha) living in the southern portion of their native range are particularly likely to encounter warmer water due to a confluence of factors. River alterations have increased the likelihood that juveniles will be exposed to warm water temperatures during their freshwater life stage, which can negatively impact survival, growth, and development and pose a threat to dwindling salmon populations. To better understand how acute thermal exposure affects the biology of salmon, we performed a transcriptional analysis of gill tissue from Chinook salmon juveniles reared at 12° and exposed acutely to water temperatures ranging from ideal to potentially lethal (12° to 25°). Reverse-transcribed RNA libraries were sequenced on the Illumina HiSeq2000 platform and a de novo reference transcriptome was created. Differentially expressed transcripts were annotated using Blast2GO and relevant gene clusters were identified. In addition to a high degree of downregulation of a wide range of genes, we found upregulation of genes involved in protein folding/rescue, protein degradation, cell death, oxidative stress, metabolism, inflammation/immunity, transcription/translation, ion transport, cell cycle/growth, cell signaling, cellular trafficking, and structure/cytoskeleton. These results demonstrate the complex multi-modal cellular response to thermal stress in juvenile salmon.
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104
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Targeting Human Long Noncoding Transcripts by Endoribonuclease-Prepared siRNAs. ACTA ACUST UNITED AC 2015; 20:1018-26. [DOI: 10.1177/1087057115583448] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 03/24/2015] [Indexed: 11/15/2022]
Abstract
Broad sequencing enterprises such as the FANTOM or ENCODE projects have substantially extended our knowledge of the human transcriptome. They have revealed that a large portion of genomic DNA is actively transcribed and have identified a plethora of novel transcripts. Many newly identified transcripts belong to the class of long noncoding RNAs (lncRNAs), which range from a few hundred bases to multiple kilobases in length and harbor no protein-coding potential. Although the biological activity of some lncRNAs is understood, the functions of most lncRNAs remain elusive. Tools that allow rapid and cost-effective access to functional data of lncRNAs are therefore essential. Here, we describe the construction and validation of an endoribonuclease-prepared siRNA (esiRNA) library designed to target 1779 individual human lncRNAs by RNA interference. We present a compendium of lncRNA expression data for 11 human cancer cell lines. Furthermore, we show that the resource is suitable for combined knockdown and localization analysis. We discuss challenges in sequence annotation of lncRNAs with respect to their often low and cell type–specific expression and specify esiRNAs that are suitable for targeting lncRNAs in commonly used human cell lines.
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105
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Raychaudhuri S, Banerjee R, Mukhopadhyay S, Bhattacharyya NP. Conserved C-terminal nascent peptide binding domain of HYPK facilitates its chaperone-like activity. J Biosci 2015; 39:659-72. [PMID: 25116620 DOI: 10.1007/s12038-014-9442-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Human HYPK (Huntingtin Yeast-two-hybrid Protein K) is an intrinsically unstructured chaperone-like protein with no sequence homology to known chaperones. HYPK is also known to be a part of ribosome-associated protein complex and present in polysomes. The objective of the present study was to investigate the evolutionary influence on HYPK primary structure and its impact on the protein's function. Amino acid sequence analysis revealed 105 orthologs of human HYPK from plants, lower invertebrates to mammals. C-terminal part of HYPK was found to be particularly conserved and to contain nascent polypeptide-associated alpha subunit (NPAA) domain. This region experiences highest selection pressure, signifying its importance in the structural and functional evolution. NPAA domain of human HYPK has unique amino acid composition preferring glutamic acid and happens to be more stable from a conformational point of view having higher content of a-helices than the rest. Cell biology studies indicate that overexpressed C-terminal human HYPK can interact with nascent proteins, co-localizes with huntingtin, increases cell viability and decreases caspase activities in Huntington's disease (HD) cell culture model. This domain is found to be required for the chaperone-like activity of HYPK in vivo. Our study suggested that by virtue of its flexibility and nascent peptide binding activity, HYPK may play an important role in assisting protein (re)folding.
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Affiliation(s)
- Swasti Raychaudhuri
- Crystallography and Molecular Biology Division, Saha Institute of Nuclear Physics, Kolkata 700 064, India,
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106
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El Fatimy R, Miozzo F, Le Mouël A, Abane R, Schwendimann L, Sabéran-Djoneidi D, de Thonel A, Massaoudi I, Paslaru L, Hashimoto-Torii K, Christians E, Rakic P, Gressens P, Mezger V. Heat shock factor 2 is a stress-responsive mediator of neuronal migration defects in models of fetal alcohol syndrome. EMBO Mol Med 2015; 6:1043-61. [PMID: 25027850 PMCID: PMC4154132 DOI: 10.15252/emmm.201303311] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Fetal alcohol spectrum disorder (FASD) is a frequent cause of mental retardation. However, the molecular mechanisms underlying brain development defects induced by maternal alcohol consumption during pregnancy are unclear. We used normal and Hsf2-deficient mice and cell systems to uncover a pivotal role for heat shock factor 2 (HSF2) in radial neuronal migration defects in the cortex, a hallmark of fetal alcohol exposure. Upon fetal alcohol exposure, HSF2 is essential for the triggering of HSF1 activation, which is accompanied by distinctive post-translational modifications, and HSF2 steers the formation of atypical alcohol-specific HSF1-HSF2 heterocomplexes. This perturbs the in vivo binding of HSF2 to heat shock elements (HSEs) in genes that control neuronal migration in normal conditions, such as p35 or the MAPs (microtubule-associated proteins, such as Dclk1 and Dcx), and alters their expression. In the absence of HSF2, migration defects as well as alterations in gene expression are reduced. Thus, HSF2, as a sensor for alcohol stress in the fetal brain, acts as a mediator of the neuronal migration defects associated with FASD.
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Affiliation(s)
- Rachid El Fatimy
- CNRS UMR7216 Épigénétique et Destin Cellulaire, Paris Cedex 13, France Univ Paris Diderot Sorbonne Paris Cité, Paris Cedex 13, France ED 387 iViv UPMC Univ Paris 06, Paris, France Univ Paris Diderot, Paris Cedex 13, France
| | - Federico Miozzo
- CNRS UMR7216 Épigénétique et Destin Cellulaire, Paris Cedex 13, France Univ Paris Diderot Sorbonne Paris Cité, Paris Cedex 13, France ED 387 iViv UPMC Univ Paris 06, Paris, France Univ Paris Diderot, Paris Cedex 13, France
| | - Anne Le Mouël
- CNRS UMR7216 Épigénétique et Destin Cellulaire, Paris Cedex 13, France Univ Paris Diderot Sorbonne Paris Cité, Paris Cedex 13, France
| | - Ryma Abane
- CNRS UMR7216 Épigénétique et Destin Cellulaire, Paris Cedex 13, France Univ Paris Diderot Sorbonne Paris Cité, Paris Cedex 13, France ED 387 iViv UPMC Univ Paris 06, Paris, France Univ Paris Diderot, Paris Cedex 13, France
| | - Leslie Schwendimann
- INSERM U1141, Hôpital Robert Debré, Paris, France Faculté de Médecine Denis Diderot, Univ Paris Diderot Sorbonne Paris Cité, Paris, France
| | - Délara Sabéran-Djoneidi
- CNRS UMR7216 Épigénétique et Destin Cellulaire, Paris Cedex 13, France Univ Paris Diderot Sorbonne Paris Cité, Paris Cedex 13, France
| | - Aurélie de Thonel
- INSERM UMR 866, Dijon, France Faculty of Medicine and Pharmacy, Univ Burgundy, Dijon, France
| | - Illiasse Massaoudi
- CNRS UMR7216 Épigénétique et Destin Cellulaire, Paris Cedex 13, France Univ Paris Diderot Sorbonne Paris Cité, Paris Cedex 13, France
| | - Liliana Paslaru
- Carol Davila University of Medicine and Pharmacy Fundeni Hospital, Bucharest, Romania
| | - Kazue Hashimoto-Torii
- Department of Neurobiology and Kavli Institute for Neuroscience, Yale University School of Medicine, New Haven, CT, USA
| | - Elisabeth Christians
- Laboratoire de Biologie du Développement de Villefranche-sur-mer, Observatoire Océanologique, CNRS, Villefranche-sur-mer, France Sorbonne Universités UPMC Univ Paris 06, Villefranche-sur-mer, France
| | - Pasko Rakic
- Department of Neurobiology and Kavli Institute for Neuroscience, Yale University School of Medicine, New Haven, CT, USA
| | - Pierre Gressens
- INSERM U1141, Hôpital Robert Debré, Paris, France Faculté de Médecine Denis Diderot, Univ Paris Diderot Sorbonne Paris Cité, Paris, France
| | - Valérie Mezger
- CNRS UMR7216 Épigénétique et Destin Cellulaire, Paris Cedex 13, France Univ Paris Diderot Sorbonne Paris Cité, Paris Cedex 13, France
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107
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Abstract
Loss of protein homeostasis (proteostasis) is a common feature of aging and disease that is characterized by the appearance of nonnative protein aggregates in various tissues. Protein aggregation is routinely suppressed by the proteostasis network (PN), a collection of macromolecular machines that operate in diverse ways to maintain proteome integrity across subcellular compartments and between tissues to ensure a healthy life span. Here, we review the composition, function, and organizational properties of the PN in the context of individual cells and entire organisms and discuss the mechanisms by which disruption of the PN, and related stress response pathways, contributes to the initiation and progression of disease. We explore emerging evidence that disease susceptibility arises from early changes in the composition and activity of the PN and propose that a more complete understanding of the temporal and spatial properties of the PN will enhance our ability to develop effective treatments for protein conformational diseases.
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Affiliation(s)
- Johnathan Labbadia
- Department of Molecular Biosciences, Rice Institute for Biomedical Research, Northwestern University, Evanston, Illinois 60208;
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108
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Lysine deacetylases regulate the heat shock response including the age-associated impairment of HSF1. J Mol Biol 2015; 427:1644-54. [PMID: 25688804 DOI: 10.1016/j.jmb.2015.02.010] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 02/09/2015] [Accepted: 02/09/2015] [Indexed: 11/22/2022]
Abstract
Heat shock factor 1 (HSF1) is critical for defending cells from both acute and chronic stresses. In aging cells, the DNA binding activity of HSF1 deteriorates correlating with the onset of pathological events including neurodegeneration and heart disease. We find that DNA binding by HSF1 is controlled by lysine deacetylases with HDAC7, HDAC9, and SIRT1 distinctly increasing the magnitude and length of a heat shock response (HSR). In contrast, HDAC1 inhibits HSF1 in a deacetylase-independent manner. In aging cells, the levels of HDAC1 are elevated and the HSR is impaired, yet reduction of HDAC1 in aged cells restores the HSR. Our results provide a mechanistic basis for the age-associated regulation of the HSR. Besides HSF1, the deacetylases differentially modulate the activities of unrelated DNA binding proteins. Taken together, our data further support the model that lysine deacetylases are selective regulators of DNA binding proteins.
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109
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Dayalan Naidu S, Kostov RV, Dinkova-Kostova AT. Transcription factors Hsf1 and Nrf2 engage in crosstalk for cytoprotection. Trends Pharmacol Sci 2014; 36:6-14. [PMID: 25465722 DOI: 10.1016/j.tips.2014.10.011] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Revised: 10/22/2014] [Accepted: 10/24/2014] [Indexed: 12/30/2022]
Abstract
Transcription factors heat shock factor (Hsf)1 and nuclear factor-erythroid 2 p45-related factor (Nrf)2 are critical for adaptation and survival. Each is maintained at low basal levels, but is robustly activated by various stimuli, including cysteine-reactive small molecules (inducers). Although each is regulated by distinct mechanisms, it is emerging that these transcription factors engage in crosstalk by sharing overlapping transcriptional targets, such as heat shock protein (HSP)70, p62, and activating transcription factor (ATF)3, and in certain cases, compensating for each other. Critically, activation of Hsf1 or Nrf2 affects the cellular redox balance by promoting the reduced state. Conversely, deletion of Hsf1 or Nrf2 is associated with oxidative stress and impaired mitochondrial function. Transient activation of Hsf1 and Nrf2 is cytoprotective, but their persistent upregulation may be detrimental, causing cardiomyopathy or accelerating carcinogenesis, and should be considered when designing strategies for disease prevention and treatment.
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Affiliation(s)
- Sharadha Dayalan Naidu
- Jacqui Wood Cancer Centre, Division of Cancer Research, Medical Research Institute, University of Dundee, Dundee, Scotland, UK
| | - Rumen V Kostov
- Jacqui Wood Cancer Centre, Division of Cancer Research, Medical Research Institute, University of Dundee, Dundee, Scotland, UK
| | - Albena T Dinkova-Kostova
- Jacqui Wood Cancer Centre, Division of Cancer Research, Medical Research Institute, University of Dundee, Dundee, Scotland, UK; Departments of Medicine and Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
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110
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Roth DM, Hutt DM, Tong J, Bouchecareilh M, Wang N, Seeley T, Dekkers JF, Beekman JM, Garza D, Drew L, Masliah E, Morimoto RI, Balch WE. Modulation of the maladaptive stress response to manage diseases of protein folding. PLoS Biol 2014; 12:e1001998. [PMID: 25406061 PMCID: PMC4236052 DOI: 10.1371/journal.pbio.1001998] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 10/07/2014] [Indexed: 12/31/2022] Open
Abstract
Diseases of protein folding arise because of the inability of an altered peptide sequence to properly engage protein homeostasis components that direct protein folding and function. To identify global principles of misfolding disease pathology we examined the impact of the local folding environment in alpha-1-antitrypsin deficiency (AATD), Niemann-Pick type C1 disease (NPC1), Alzheimer's disease (AD), and cystic fibrosis (CF). Using distinct models, including patient-derived cell lines and primary epithelium, mouse brain tissue, and Caenorhabditis elegans, we found that chronic expression of misfolded proteins not only triggers the sustained activation of the heat shock response (HSR) pathway, but that this sustained activation is maladaptive. In diseased cells, maladaptation alters protein structure-function relationships, impacts protein folding in the cytosol, and further exacerbates the disease state. We show that down-regulation of this maladaptive stress response (MSR), through silencing of HSF1, the master regulator of the HSR, restores cellular protein folding and improves the disease phenotype. We propose that restoration of a more physiological proteostatic environment will strongly impact the management and progression of loss-of-function and gain-of-toxic-function phenotypes common in human disease.
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Affiliation(s)
- Daniela Martino Roth
- Department of Cell Biology, The Scripps Research Institute, La Jolla, California, United States of America
| | - Darren M. Hutt
- Department of Cell Biology, The Scripps Research Institute, La Jolla, California, United States of America
| | - Jiansong Tong
- Department of Cell Biology, The Scripps Research Institute, La Jolla, California, United States of America
| | - Marion Bouchecareilh
- Department of Cell Biology, The Scripps Research Institute, La Jolla, California, United States of America
| | - Ning Wang
- Department of Molecular Biosciences, Rice Institute for Biomedical Research, Northwestern University, Evanston, Illinois, United States of America
| | - Theo Seeley
- Department of Cell Biology, The Scripps Research Institute, La Jolla, California, United States of America
| | - Johanna F. Dekkers
- Department of Pediatric Pulmonology, Wilhelmina Children's Hospital, University Medical Centre, Utrecht, The Netherlands
- Laboratory of Translational Immunology, Wilhelmina Children's Hospital, University Medical Centre, Utrecht, The Netherlands
| | - Jeffrey M. Beekman
- Department of Pediatric Pulmonology, Wilhelmina Children's Hospital, University Medical Centre, Utrecht, The Netherlands
- Laboratory of Translational Immunology, Wilhelmina Children's Hospital, University Medical Centre, Utrecht, The Netherlands
| | - Dan Garza
- Proteostasis Therapeutics Inc., Cambridge, Massachusetts, United States of America
| | - Lawrence Drew
- Proteostasis Therapeutics Inc., Cambridge, Massachusetts, United States of America
| | - Eliezer Masliah
- Department of Neurosciences, University of California, San Diego, La Jolla, California, United States of America
| | - Richard I. Morimoto
- Department of Molecular Biosciences, Rice Institute for Biomedical Research, Northwestern University, Evanston, Illinois, United States of America
| | - William E. Balch
- Department of Cell Biology, The Scripps Research Institute, La Jolla, California, United States of America
- The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, California, United States of America
- Department of Chemical Physiology, The Scripps Research Institute, La Jolla, California, United States of America
- The Institute for Childhood and Neglected Diseases, The Scripps Research Institute, La Jolla, California, United States of America
- * E-mail:
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111
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ATF1 modulates the heat shock response by regulating the stress-inducible heat shock factor 1 transcription complex. Mol Cell Biol 2014; 35:11-25. [PMID: 25312646 DOI: 10.1128/mcb.00754-14] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The heat shock response is an evolutionally conserved adaptive response to high temperatures that controls proteostasis capacity and is regulated mainly by an ancient heat shock factor (HSF). However, the regulation of target genes by the stress-inducible HSF1 transcription complex has not yet been examined in detail in mammalian cells. In the present study, we demonstrated that HSF1 interacted with members of the ATF1/CREB family involved in metabolic homeostasis and recruited them on the HSP70 promoter in response to heat shock. The HSF1 transcription complex, including the chromatin-remodeling factor BRG1 and lysine acetyltransferases p300 and CREB-binding protein (CBP), was formed in a manner that was dependent on the phosphorylation of ATF1. ATF1-BRG1 promoted the establishment of an active chromatin state and HSP70 expression during heat shock, whereas ATF1-p300/CBP accelerated the shutdown of HSF1 DNA-binding activity during recovery from acute stress, possibly through the acetylation of HSF1. Furthermore, ATF1 markedly affected the resistance to heat shock. These results revealed the unanticipated complexity of the primitive heat shock response mechanism, which is connected to metabolic adaptation.
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112
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Hipp MS, Park SH, Hartl FU. Proteostasis impairment in protein-misfolding and -aggregation diseases. Trends Cell Biol 2014; 24:506-14. [DOI: 10.1016/j.tcb.2014.05.003] [Citation(s) in RCA: 449] [Impact Index Per Article: 44.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Revised: 05/19/2014] [Accepted: 05/20/2014] [Indexed: 12/27/2022]
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113
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The systemic amyloid precursor transthyretin (TTR) behaves as a neuronal stress protein regulated by HSF1 in SH-SY5Y human neuroblastoma cells and APP23 Alzheimer's disease model mice. J Neurosci 2014; 34:7253-65. [PMID: 24849358 DOI: 10.1523/jneurosci.4936-13.2014] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Increased neuronal synthesis of transthyretin (TTR) may favorably impact on Alzheimer's disease (AD) because TTR has been shown to inhibit Aβ aggregation and detoxify cell-damaging conformers. The mechanism whereby hippocampal and cortical neurons from AD patients and APP23 AD model mice produce more TTR is unknown. We now show that TTR expression in SH-SY5Y human neuroblastoma cells, primary hippocampal neurons and the hippocampus of APP23 mice, is significantly enhanced by heat shock factor 1 (HSF1). Chromatin immunoprecipitation (ChIP) assays demonstrated occupation of TTR promoter heat shock elements by HSF1 in APP23 hippocampi, primary murine hippocampal neurons, and SH-SY5Y cells, but not in mouse liver, cultured human hepatoma (HepG2) cells, or AC16 cultured human cardiomyocytes. Treating SH-SY5Y human neuroblastoma cells with heat shock or the HSF1 stimulator celastrol increased TTR transcription in parallel with that of HSP40, HSP70, and HSP90. With both treatments, ChIP showed increased occupancy of heat shock elements in the TTR promoter by HSF1. In vivo celastrol increased the HSF1 ChIP signal in hippocampus but not in liver. Transfection of a human HSF1 construct into SH-SY5Y cells increased TTR transcription and protein production, which could be blocked by shHSF1 antisense. The effect is neuron specific. In cultured HepG2 cells, HSF1 was either suppressive or had no effect on TTR expression confirming the differential effects of HSF1 on TTR transcription in different cell types.
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114
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Ryno LM, Genereux J, Naito T, Morimoto RI, Powers ET, Shoulders MD, Wiseman RL. Characterizing the altered cellular proteome induced by the stress-independent activation of heat shock factor 1. ACS Chem Biol 2014; 9:1273-83. [PMID: 24689980 PMCID: PMC4076015 DOI: 10.1021/cb500062n] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2014] [Accepted: 04/01/2014] [Indexed: 01/18/2023]
Abstract
The heat shock response is an evolutionarily conserved, stress-responsive signaling pathway that adapts cellular proteostasis in response to pathologic insult. In metazoans, the heat shock response primarily functions through the posttranslational activation of heat shock factor 1 (HSF1), a stress-responsive transcription factor that induces the expression of cytosolic proteostasis factors including chaperones, cochaperones, and folding enzymes. HSF1 is a potentially attractive therapeutic target to ameliorate pathologic imbalances in cellular proteostasis associated with human disease, although the underlying impact of stress-independent HSF1 activation on cellular proteome composition remains to be defined. Here, we employ a highly controllable, ligand-regulated HSF1 that activates HSF1 to levels compatible with those that could be achieved using selective small molecule HSF1 activators. Using a combination of RNAseq and quantitative proteomics, we define the impact of stress-independent HSF1 activation on the composition of the cellular proteome. We show that stress-independent HSF1 activation selectively remodels cytosolic proteostasis pathways without globally influencing the composition of the cellular proteome. Furthermore, we show that stress-independent HSF1 activation decreases intracellular aggregation of a model polyglutamine-containing protein and reduces the cellular toxicity of environmental toxins like arsenite that disrupt cytosolic proteostasis. Collectively, our results reveal a proteome-level view of stress-independent HSF1 activation, providing a framework to establish therapeutic approaches to correct pathologic imbalances in cellular proteostasis through the selective targeting of HSF1.
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Affiliation(s)
- Lisa M. Ryno
- Department
of Molecular & Experimental Medicine, Department of Chemical Physiology, The Scripps Research Institute, La Jolla, California 92037, United States
| | - Joseph
C. Genereux
- Department
of Molecular & Experimental Medicine, Department of Chemical Physiology, The Scripps Research Institute, La Jolla, California 92037, United States
| | - Tadasuke Naito
- Department
of Molecular Biosciences, Rice Institute for Biomedical Research, Northwestern University, Evanston, Illinois 60208, United States
| | - Richard I. Morimoto
- Department
of Molecular Biosciences, Rice Institute for Biomedical Research, Northwestern University, Evanston, Illinois 60208, United States
| | - Evan T. Powers
- Department
of Chemistry, The Scripps Research Institute, La Jolla, California 92037, United States
| | - Matthew D. Shoulders
- Department
of Molecular & Experimental Medicine, Department of Chemical Physiology, The Scripps Research Institute, La Jolla, California 92037, United States
- Department
of Chemistry, Massachusetts Institute of
Technology, Cambridge, Massachusetts 02139, United States
| | - R. Luke Wiseman
- Department
of Molecular & Experimental Medicine, Department of Chemical Physiology, The Scripps Research Institute, La Jolla, California 92037, United States
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115
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Neueder A, Achilli F, Moussaoui S, Bates GP. Novel isoforms of heat shock transcription factor 1, HSF1γα and HSF1γβ, regulate chaperone protein gene transcription. J Biol Chem 2014; 289:19894-906. [PMID: 24855652 PMCID: PMC4106310 DOI: 10.1074/jbc.m114.570739] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The heat shock response, resulting in the production of heat shock proteins or molecular chaperones, is triggered by elevated temperature and a variety of other stressors. Its master regulator is heat shock transcription factor 1 (HSF1). Heat shock factors generally exist in multiple isoforms. The two known isoforms of HSF1 differ in the inclusion (HSF1α) or exclusion (HSF1β) of exon 11. Although there are some data concerning the differential expression patterns and transcriptional activities of HSF2 isoforms during development, little is known about the distinct properties of the HSF1 isoforms. Here we present evidence for two novel HSF1 isoforms termed HSF1γα and HSF1γβ, and we show that the HSF1 isoform ratio differentially regulates heat shock protein gene transcription. Hsf1γ isoforms are expressed in various mouse tissues and are translated into protein. Furthermore, after heat shock, HSF1γ isoforms are exported from the nucleus more rapidly or degraded more quickly than HSF1α or HSF1β. We also show that each individual HSF1 isoform is sufficient to induce the heat shock response and that expression of combinations of HSF1 isoforms, in particular HSF1α and HSF1β, results in a synergistic enhancement of the transcriptional response. In addition, HSF1γ isoforms potentially suppress the synergistic effect of HSF1α and HSF1β co-expression. Collectively, our observations suggest that the expression of HSF1 isoforms in a specific ratio provides an additional layer in the regulation of heat shock protein gene transcription.
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Affiliation(s)
- Andreas Neueder
- From the Department of Medical and Molecular Genetics, King's College London, London SE1 9RT, United Kingdom and
| | - Francesca Achilli
- From the Department of Medical and Molecular Genetics, King's College London, London SE1 9RT, United Kingdom and
| | - Saliha Moussaoui
- Neuroscience Discovery, Novartis Institute for Biomedical Research, CH-4002 Basel, Switzerland
| | - Gillian P Bates
- From the Department of Medical and Molecular Genetics, King's College London, London SE1 9RT, United Kingdom and
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