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Paredes F, Williams HC, Liu X, Holden C, Bogan B, Wang Y, Crotty KM, Yeligar SM, Elorza AA, Lin Z, Rezvan A, San Martin A. The mitochondrial protease ClpP is a druggable target that controls VSMC phenotype by a SIRT1-dependent mechanism. Redox Biol 2024; 73:103203. [PMID: 38823208 DOI: 10.1016/j.redox.2024.103203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 05/12/2024] [Accepted: 05/20/2024] [Indexed: 06/03/2024] Open
Abstract
Vascular smooth muscle cells (VSMCs), known for their remarkable lifelong phenotypic plasticity, play a pivotal role in vascular pathologies through their ability to transition between different phenotypes. Our group discovered that the deficiency of the mitochondrial protein Poldip2 induces VSMC differentiation both in vivo and in vitro. Further comprehensive biochemical investigations revealed Poldip2's specific interaction with the mitochondrial ATPase caseinolytic protease chaperone subunit X (CLPX), which is the regulatory subunit for the caseinolytic protease proteolytic subunit (ClpP) that forms part of the ClpXP complex - a proteasome-like protease evolutionarily conserved from bacteria to humans. This interaction limits the protease's activity, and reduced Poldip2 levels lead to ClpXP complex activation. This finding prompted the hypothesis that ClpXP complex activity within the mitochondria may regulate the VSMC phenotype. Employing gain-of-function and loss-of-function strategies, we demonstrated that ClpXP activity significantly influences the VSMC phenotype. Notably, both genetic and pharmacological activation of ClpXP inhibits VSMC plasticity and fosters a quiescent, differentiated, and anti-inflammatory VSMC phenotype. The pharmacological activation of ClpP using TIC10, currently in phase III clinical trials for cancer, successfully replicates this phenotype both in vitro and in vivo and markedly reduces aneurysm development in a mouse model of elastase-induced aortic aneurysms. Our mechanistic exploration indicates that ClpP activation regulates the VSMC phenotype by modifying the cellular NAD+/NADH ratio and activating Sirtuin 1. Our findings reveal the crucial role of mitochondrial proteostasis in the regulation of the VSMC phenotype and propose the ClpP protease as a novel, actionable target for manipulating the VSMC phenotype.
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Affiliation(s)
- Felipe Paredes
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, GA, United States
| | - Holly C Williams
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, GA, United States
| | - Xuesong Liu
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, GA, United States; Department of Cardiology, The First Affiliated Hospital of Kunming Medical University, Kunming, China
| | - Claire Holden
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, GA, United States
| | - Bethany Bogan
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, GA, United States
| | - Yu Wang
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, GA, United States
| | - Kathryn M Crotty
- Department of Medicine, Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, Emory University, Atlanta, GA, United States; Atlanta Veterans Affairs Health Care System, Decatur, GA, United States
| | - Samantha M Yeligar
- Department of Medicine, Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, Emory University, Atlanta, GA, United States; Atlanta Veterans Affairs Health Care System, Decatur, GA, United States
| | - Alvaro A Elorza
- Institute of Biomedical Sciences, Faculty of Medicine and Faculty of Life Sciences, Universidad Andres Bello, Santiago, Chile
| | - Zhiyong Lin
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, GA, United States
| | - Amir Rezvan
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, GA, United States
| | - Alejandra San Martin
- Department of Medicine, Division of Cardiology, Emory University, Atlanta, GA, United States; Institute of Biomedical Sciences, Faculty of Medicine and Faculty of Life Sciences, Universidad Andres Bello, Santiago, Chile.
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2
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Key J, Gispert S, Kandi AR, Heinz D, Hamann A, Osiewacz HD, Meierhofer D, Auburger G. CLPP-Null Eukaryotes with Excess Heme Biosynthesis Show Reduced L-arginine Levels, Probably via CLPX-Mediated OAT Activation. Biomolecules 2024; 14:241. [PMID: 38397478 PMCID: PMC10886707 DOI: 10.3390/biom14020241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 02/12/2024] [Accepted: 02/16/2024] [Indexed: 02/25/2024] Open
Abstract
The serine peptidase CLPP is conserved among bacteria, chloroplasts, and mitochondria. In humans and mice, its loss causes Perrault syndrome, which presents with growth deficits, infertility, deafness, and ataxia. In the filamentous fungus Podospora anserina, CLPP loss leads to longevity. CLPP substrates are selected by CLPX, an AAA+ unfoldase. CLPX is known to target delta-aminolevulinic acid synthase (ALAS) to promote pyridoxal phosphate (PLP) binding. CLPX may also influence cofactor association with other enzymes. Here, the evaluation of P. anserina metabolomics highlighted a reduction in arginine/histidine levels. In Mus musculus cerebellum, reductions in arginine/histidine and citrulline occurred with a concomitant accumulation of the heme precursor protoporphyrin IX. This suggests that the increased biosynthesis of 5-carbon (C5) chain deltaALA consumes not only C4 succinyl-CoA and C1 glycine but also specific C5 delta amino acids. As enzymes responsible for these effects, the elevated abundance of CLPX and ALAS is paralleled by increased OAT (PLP-dependent, ornithine delta-aminotransferase) levels. Possibly as a consequence of altered C1 metabolism, the proteome profiles of P. anserina CLPP-null cells showed strong accumulation of a methyltransferase and two mitoribosomal large subunit factors. The reduced histidine levels may explain the previously observed metal interaction problems. As the main nitrogen-storing metabolite, a deficiency in arginine would affect the urea cycle and polyamine synthesis. Supplementation of arginine and histidine might rescue the growth deficits of CLPP-mutant patients.
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Affiliation(s)
- Jana Key
- Goethe University Frankfurt, University Hospital, Clinic of Neurology, Experimental Neurology, Heinrich Hoffmann Str. 7, 60590 Frankfurt am Main, Germany; (J.K.); (S.G.); (A.R.K.)
| | - Suzana Gispert
- Goethe University Frankfurt, University Hospital, Clinic of Neurology, Experimental Neurology, Heinrich Hoffmann Str. 7, 60590 Frankfurt am Main, Germany; (J.K.); (S.G.); (A.R.K.)
| | - Arvind Reddy Kandi
- Goethe University Frankfurt, University Hospital, Clinic of Neurology, Experimental Neurology, Heinrich Hoffmann Str. 7, 60590 Frankfurt am Main, Germany; (J.K.); (S.G.); (A.R.K.)
| | - Daniela Heinz
- Institute of Molecular Biosciences, Faculty of Biosciences, Goethe-University Frankfurt, 60438 Frankfurt am Main, Germany; (D.H.); (A.H.); (H.D.O.)
| | - Andrea Hamann
- Institute of Molecular Biosciences, Faculty of Biosciences, Goethe-University Frankfurt, 60438 Frankfurt am Main, Germany; (D.H.); (A.H.); (H.D.O.)
| | - Heinz D. Osiewacz
- Institute of Molecular Biosciences, Faculty of Biosciences, Goethe-University Frankfurt, 60438 Frankfurt am Main, Germany; (D.H.); (A.H.); (H.D.O.)
| | - David Meierhofer
- Max Planck Institute for Molecular Genetics, Ihnestraße 63-73, 14195 Berlin, Germany;
| | - Georg Auburger
- Goethe University Frankfurt, University Hospital, Clinic of Neurology, Experimental Neurology, Heinrich Hoffmann Str. 7, 60590 Frankfurt am Main, Germany; (J.K.); (S.G.); (A.R.K.)
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Cozzolino M, Ergun Y, Ristori E, Garg A, Imamoglu G, Seli E. Disruption of mitochondrial unfolded protein response results in telomere shortening in mouse oocytes and somatic cells. Aging (Albany NY) 2024; 16:2047-2060. [PMID: 38349865 PMCID: PMC10911389 DOI: 10.18632/aging.205543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 12/01/2023] [Indexed: 02/15/2024]
Abstract
Caseinolytic peptidase P (CLPP) plays a central role in mitochondrial unfolded protein response (mtUPR) by promoting the breakdown of misfolded proteins and setting in motion a cascade of reactions to re-establish protein homeostasis. Global germline deletion of Clpp in mice results in female infertility and accelerated follicular depletion. Telomeres are tandem repeats of 5'-TTAGGG-3' sequences found at the ends of the chromosomes. Telomeres are essential for maintaining chromosome stability during somatic cell division and their shortening is associated with cellular senescence and aging. In this study, we asked whether the infertility and ovarian aging phenotype caused by global germline deletion of Clpp is associated with somatic aging, and tested telomere length in tissues of young and aging mice. We found that impaired mtUPR caused by the lack of CLPP is associated with accelerated telomere shortening in both oocytes and somatic cells of aging mice. In addition, expression of several genes that maintain telomere integrity was decreased, and double-strand DNA breaks were increased in telomeric regions. Our results highlight how impaired mtUPR can affect telomere integrity and demonstrate a link between loss of mitochondrial protein hemostasis, infertility, and somatic aging.
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Affiliation(s)
- Mauro Cozzolino
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale School of Medicine, New Haven, CT 06510, USA
- IVIRMA Global Research Alliance, IVIRMA Roma, Rome, Italy
- IVIRMA Global Research Alliance, Fundacion IVI-IIS la Fe, Valencia, Spain
| | - Yagmur Ergun
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale School of Medicine, New Haven, CT 06510, USA
- IVIRMA Global Research Alliance, IVIRMA New Jersey, Marlton, NJ 08053, USA
| | - Emma Ristori
- Department of Genetics, Yale School of Medicine, New Haven, CT 06510, USA
| | - Akanksha Garg
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale School of Medicine, New Haven, CT 06510, USA
- Department of Metabolism, Digestion and Reproduction, Imperial College London, London, United Kingdom
| | - Gizem Imamoglu
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale School of Medicine, New Haven, CT 06510, USA
| | - Emre Seli
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale School of Medicine, New Haven, CT 06510, USA
- IVIRMA Global Research Alliance, IVIRMA New Jersey, Basking Ridge, NJ 07920, USA
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Zhaliazka K, Ali A, Kurouski D. Phospholipids and Cholesterol Determine Molecular Mechanisms of Cytotoxicity of α-Synuclein Oligomers and Fibrils. ACS Chem Neurosci 2024; 15:371-381. [PMID: 38166409 DOI: 10.1021/acschemneuro.3c00671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2024] Open
Abstract
Progressive loss of dopaminergic (DA) neurons in the substantia nigra pars compacta, hypothalamus, and thalamus is a hallmark of Parkinson's disease. Neuronal death is linked to the abrupt aggregation of α-synuclein (α-Syn), a small membrane protein that regulates cell vesicle trafficking. α-Syn aggregation rate, as well as the secondary structure and toxicity of α-Syn fibrils, could be uniquely altered by lipids. However, molecular mechanisms that determine such a remarkable difference in the toxicity of α-Syn fibrils formed in the presence of lipids remain unclear. In this study, we used a set of molecular assays to determine the molecular mechanism by which α-Syn fibrils formed in the presence of phosphatidylcholine (PC), cardiolipin (CL), and cholesterol (Cho) exert cell toxicity. We found that rat dopaminergic cells exposed to α-Syn fibrils formed in the presence of different lipids exert drastically different magnitudes and dynamics of unfolded protein response (UPR) in the endoplasmic reticulum (ER) and mitochondria (MT). Specifically, α-Syn:CL were found to cause the strongest, whereas α-Syn fibrils formed in the absence of lipids had the lowest magnitude of the UPR cell response. We also found the opposite dynamics of the ER- and MT-UPR responses in rat dopaminergic cells exposed to protein aggregates. These results could suggest that facing severe ER stress, dopaminergic cells suppress MT-UPR response, enabling the maximal ATP production to restore their normal physiological function. These findings help to better understand complex mechanisms of cell toxicity of amyloid aggregates and ultimately find neuroprotective drug candidates that will be able to suppress the spread of Parkinson's disease.
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Affiliation(s)
- Kiryl Zhaliazka
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843, United States
| | - Abid Ali
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843, United States
| | - Dmitry Kurouski
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843, United States
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas 77843, United States
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5
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Yin Y, Wu C, Zhou Y, Zhang M, Mai S, Chen M, Wang HY. Ezetimibe Induces Paraptosis through Niemann-Pick C1-like 1 Inhibition of Mammalian-Target-of-Rapamycin Signaling in Hepatocellular Carcinoma Cells. Genes (Basel) 2023; 15:4. [PMID: 38275586 PMCID: PMC10815321 DOI: 10.3390/genes15010004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 11/29/2023] [Accepted: 12/06/2023] [Indexed: 01/27/2024] Open
Abstract
Currently, hepatocellular carcinoma (HCC) is characterized by its unfavorable prognosis and resistance to conventional chemotherapy and radiotherapy. Drug repositioning, an approach aimed at identifying novel therapeutic applications for existing drugs, presents a cost-effective strategy for developing new anticancer agents. We explored the anticancer properties of Ezetimibe, a widely used oral lipid-lowering drug, in the context of HCC. Our findings demonstrate that Ezetimibe effectively suppresses HCC cell proliferation through paraptosis, an apoptotic-independent cell death pathway. The examination of HCC cells lines treated with Ezetimibe using light microscopy and transmission electron microscopy (TEM) showed cytoplasmic vacuolation in the perinuclear region. Notably, the nuclear membrane remained intact in both Ezetimibe-treated and untreated HCC cell lines. Probe staining assays confirmed that the cytoplasmic vacuoles originated from dilated endoplasmic reticulum (ER) compartments rather than mitochondria. Furthermore, a dose-dependent accumulation of reactive oxygen species (ROS) was observed in Ezetimibe-treated HCC cell lines. Co-treatment with the general antioxidant NAC attenuated vacuolation and improved cell viability in Ezetimibe-treated HCC cells. Moreover, Ezetimibe induced paraptosis through proteasome activity inhibition and initiation of the unfolded protein response (UPR) in HCC cell lines. In our in vivo experiment, Ezetimibe significantly impeded the growth of HCC tumors. Furthermore, when combined with Sorafenib, Ezetimibe exhibited a synergistic antitumor effect on HCC cell lines. Mechanistically, Ezetimibe induced paraptosis by targeting NPC1L1 to inhibit the PI3K/AKT/mTOR signaling pathway. In conclusion, our study highlights the potential of Ezetimibe as an anticancer agent by triggering paraptosis in HCC cells.
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Affiliation(s)
- Yuting Yin
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China; (Y.Y.); (C.W.); (Y.Z.); (M.Z.); (S.M.)
- Guangdong Provincial Clinical Research Center for Cancer, Sun Yat-Sen University Cancer Center, Guangzhou 510060, China
| | - Chun Wu
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China; (Y.Y.); (C.W.); (Y.Z.); (M.Z.); (S.M.)
- Guangdong Provincial Clinical Research Center for Cancer, Sun Yat-Sen University Cancer Center, Guangzhou 510060, China
| | - Yufeng Zhou
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China; (Y.Y.); (C.W.); (Y.Z.); (M.Z.); (S.M.)
- Guangdong Provincial Clinical Research Center for Cancer, Sun Yat-Sen University Cancer Center, Guangzhou 510060, China
| | - Meiyin Zhang
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China; (Y.Y.); (C.W.); (Y.Z.); (M.Z.); (S.M.)
- Guangdong Provincial Clinical Research Center for Cancer, Sun Yat-Sen University Cancer Center, Guangzhou 510060, China
| | - Shijuan Mai
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China; (Y.Y.); (C.W.); (Y.Z.); (M.Z.); (S.M.)
- Guangdong Provincial Clinical Research Center for Cancer, Sun Yat-Sen University Cancer Center, Guangzhou 510060, China
| | - Minshan Chen
- Department of Liver Surgery, Sun Yat-Sen University Cancer Center, Guangzhou 510060, China;
| | - Hui-Yun Wang
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China; (Y.Y.); (C.W.); (Y.Z.); (M.Z.); (S.M.)
- Guangdong Provincial Clinical Research Center for Cancer, Sun Yat-Sen University Cancer Center, Guangzhou 510060, China
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6
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Cilleros-Holgado P, Gómez-Fernández D, Piñero-Pérez R, Romero-Domínguez JM, Reche-López D, López-Cabrera A, Álvarez-Córdoba M, Munuera-Cabeza M, Talaverón-Rey M, Suárez-Carrillo A, Romero-González A, Sánchez-Alcázar JA. Mitochondrial Quality Control via Mitochondrial Unfolded Protein Response (mtUPR) in Ageing and Neurodegenerative Diseases. Biomolecules 2023; 13:1789. [PMID: 38136659 PMCID: PMC10741690 DOI: 10.3390/biom13121789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2023] [Revised: 12/07/2023] [Accepted: 12/11/2023] [Indexed: 12/24/2023] Open
Abstract
Mitochondria play a key role in cellular functions, including energy production and oxidative stress regulation. For this reason, maintaining mitochondrial homeostasis and proteostasis (homeostasis of the proteome) is essential for cellular health. Therefore, there are different mitochondrial quality control mechanisms, such as mitochondrial biogenesis, mitochondrial dynamics, mitochondrial-derived vesicles (MDVs), mitophagy, or mitochondrial unfolded protein response (mtUPR). The last item is a stress response that occurs when stress is present within mitochondria and, especially, when the accumulation of unfolded and misfolded proteins in the mitochondrial matrix surpasses the folding capacity of the mitochondrion. In response to this, molecular chaperones and proteases as well as the mitochondrial antioxidant system are activated to restore mitochondrial proteostasis and cellular function. In disease contexts, mtUPR modulation holds therapeutic potential by mitigating mitochondrial dysfunction. In particular, in the case of neurodegenerative diseases, such as primary mitochondrial diseases, Alzheimer's disease (AD), Parkinson's disease (PD), Huntington's disease (HD), Amyotrophic Lateral Sclerosis (ALS), or Friedreich's Ataxia (FA), there is a wealth of evidence demonstrating that the modulation of mtUPR helps to reduce neurodegeneration and its associated symptoms in various cellular and animal models. These findings underscore mtUPR's role as a promising therapeutic target in combating these devastating disorders.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - Jose Antonio Sánchez-Alcázar
- Centro Andaluz de Biología del Desarrollo (CABD-CSIC-Universidad Pablo de Olavide), 41013 Sevilla, Spain; (P.C.-H.); (D.G.-F.); (R.P.-P.); (J.M.R.-D.); (D.R.-L.); (A.L.-C.); (M.Á.-C.); (M.M.-C.); (M.T.-R.); (A.S.-C.); (A.R.-G.)
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7
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Suzuki K, Kubota Y, Kaneko K, Kamata CC, Furuyama K. CLPX regulates mitochondrial fatty acid β-oxidation in liver cells. J Biol Chem 2023; 299:105210. [PMID: 37660922 PMCID: PMC10556790 DOI: 10.1016/j.jbc.2023.105210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2022] [Revised: 08/10/2023] [Accepted: 08/23/2023] [Indexed: 09/05/2023] Open
Abstract
Mitochondrial fatty acid oxidation (β-oxidation) is an essential metabolic process for energy production in eukaryotic cells, but the regulatory mechanisms of this pathway are largely unknown. In the present study, we found that several enzymes involved in β-oxidation are associated with CLPX, the AAA+ unfoldase that is a component of the mitochondrial matrix protease ClpXP. The suppression of CLPX expression increased β-oxidation activity in the HepG2 cell line and in primary human hepatocytes without glucagon treatment. However, the protein levels of enzymes involved in β-oxidation did not significantly increase in CLPX-deleted HepG2 cells (CLPX-KO cells). Coimmunoprecipitation experiments revealed that the protein level in the immunoprecipitates of each antibody changed after the treatment of WT cells with glucagon, and a part of these changes was also observed in the comparison of WT and CLPX-KO cells without glucagon treatment. Although the exogenous expression of WT or ATP-hydrolysis mutant CLPX suppressed β-oxidation activity in CLPX-KO cells, glucagon treatment induced β-oxidation activity only in CLPX-KO cells expressing WT CLPX. These results suggest that the dissociation of CLPX from its target proteins is essential for the induction of β-oxidation in HepG2 cells. Moreover, specific phosphorylation of AMP-activated protein kinase and a decrease in the expression of acetyl-CoA carboxylase 2 were observed in CLPX-KO cells, suggesting that CLPX might participate in the regulation of the cytosolic signaling pathway for β-oxidation. The mechanism for AMP-activated protein kinase phosphorylation remains elusive; however, our results uncovered the hitherto unknown role of CLPX in mitochondrial β-oxidation in human liver cells.
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Affiliation(s)
- Ko Suzuki
- Department of Molecular Biochemistry, Iwate Medical University, Yahaba, Iwate, Japan
| | - Yoshiko Kubota
- Department of Molecular Biochemistry, Iwate Medical University, Yahaba, Iwate, Japan
| | - Kiriko Kaneko
- Department of Molecular Biochemistry, Iwate Medical University, Yahaba, Iwate, Japan
| | | | - Kazumichi Furuyama
- Department of Molecular Biochemistry, Iwate Medical University, Yahaba, Iwate, Japan.
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8
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Li Y, Huang D, Jia L, Shangguan F, Gong S, Lan L, Song Z, Xu J, Yan C, Chen T, Tan Y, Liu Y, Huang X, Suzuki CK, Yang Z, Yang G, Lu B. LonP1 Links Mitochondria-ER Interaction to Regulate Heart Function. RESEARCH (WASHINGTON, D.C.) 2023; 6:0175. [PMID: 37333972 PMCID: PMC10275618 DOI: 10.34133/research.0175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 05/29/2023] [Indexed: 06/20/2023]
Abstract
Interorganelle contacts and communications are increasingly recognized to play a vital role in cellular function and homeostasis. In particular, the mitochondria-endoplasmic reticulum (ER) membrane contact site (MAM) is known to regulate ion and lipid transfer, as well as signaling and organelle dynamics. However, the regulatory mechanisms of MAM formation and their function are still elusive. Here, we identify mitochondrial Lon protease (LonP1), a highly conserved mitochondrial matrix protease, as a new MAM tethering protein. The removal of LonP1 substantially reduces MAM formation and causes mitochondrial fragmentation. Furthermore, deletion of LonP1 in the cardiomyocytes of mouse heart impairs MAM integrity and mitochondrial fusion and activates the unfolded protein response within the ER (UPRER). Consequently, cardiac-specific LonP1 deficiency causes aberrant metabolic reprogramming and pathological heart remodeling. These findings demonstrate that LonP1 is a novel MAM-localized protein orchestrating MAM integrity, mitochondrial dynamics, and UPRER, offering exciting new insights into the potential therapeutic strategy for heart failure.
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Affiliation(s)
- Yujie Li
- The Affiliated Nanhua Hospital and School of Basic Medical Sciences, Hengyang Medical School,
University of South China, Hengyang, Hunan 421001, China
- School of Laboratory Medicine and Life Sciences,
Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
- National Health Commission Key Laboratory of Birth Defect Research and Prevention,
Hunan Provincial Maternal and Child Health Care Hospital, Changsha, Hunan 410008, China
| | - Dawei Huang
- School of Laboratory Medicine and Life Sciences,
Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Lianqun Jia
- Key Laboratory of Ministry of Education for TCM Viscera-State Theory and Applications, Ministry of Education of China,
Liaoning University of Traditional Chinese Medicine, Shenyang, Liaoning 110847, China
| | - Fugen Shangguan
- School of Laboratory Medicine and Life Sciences,
Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province,
The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Shiwei Gong
- School of Laboratory Medicine and Life Sciences,
Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Linhua Lan
- School of Laboratory Medicine and Life Sciences,
Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province,
The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Zhiyin Song
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences,
Wuhan University, Wuhan, Hubei 430072, China
| | - Juan Xu
- Nanjing Maternity and Child Health Care Hospital,
Obstetrics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing 210004, China
| | - Chaojun Yan
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences,
Wuhan University, Wuhan, Hubei 430072, China
| | - Tongke Chen
- Animal Center,
Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Yin Tan
- Department of Cardiology,
The First Affiliated Hospital of University of South China, Hengyang, Hunan, China
| | - Yongzhang Liu
- School of Laboratory Medicine and Life Sciences,
Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Xingxu Huang
- School of Life Science and Technology,
Shanghai Tech University, Shanghai 201210, China
| | - Carolyn K. Suzuki
- Department of Microbiology, Biochemistry and Molecular Genetics, New Jersey Medical School-Rutgers,
The State University of New Jersey, Newark, NJ, USA
| | - Zhongzhou Yang
- State Key Laboratory of Pharmaceutical Biotechnology, Department of Cardiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School and MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center,
Nanjing University, Nanjing 210061, China
| | - Guanlin Yang
- Key Laboratory of Ministry of Education for TCM Viscera-State Theory and Applications, Ministry of Education of China,
Liaoning University of Traditional Chinese Medicine, Shenyang, Liaoning 110847, China
| | - Bin Lu
- The Affiliated Nanhua Hospital and School of Basic Medical Sciences, Hengyang Medical School,
University of South China, Hengyang, Hunan 421001, China
- School of Laboratory Medicine and Life Sciences,
Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
- National Health Commission Key Laboratory of Birth Defect Research and Prevention,
Hunan Provincial Maternal and Child Health Care Hospital, Changsha, Hunan 410008, China
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9
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Exercise Induces an Augmented Skeletal Muscle Mitochondrial Unfolded Protein Response in a Mouse Model of Obesity Produced by a High-Fat Diet. Int J Mol Sci 2023; 24:ijms24065654. [PMID: 36982728 PMCID: PMC10051316 DOI: 10.3390/ijms24065654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 03/06/2023] [Accepted: 03/10/2023] [Indexed: 03/18/2023] Open
Abstract
Increase in body fat contributes to loss of function and changes in skeletal muscle, accelerating sarcopenia, a phenomenon known as sarco-obesity or sarcopenic obesity. Studies suggest that obesity decreases the skeletal muscle (SM)’s ability to oxidize glucose, increases fatty acid oxidation and reactive oxygen species production, due to mitochondrial dysfunction. Exercise improves mitochondrial dysfunction in obesity; however, it is not known if exercise regulates the mitochondrial unfolded protein response (UPRmt) in the SM. Our study aimed to determine the mito-nuclear UPRmt in response to exercise in a model of obesity, and how this response is associated with the improvement in SM functioning after exercise training. C57BL/6 mice were fed a normal diet and high-fat diet (HFD) for 12 weeks. After 8 weeks, animals were subdivided into sedentary and exercised for the remaining 4 weeks. Grip strength and maximal velocity of mice submitted to HFD improved after training. Our results show an increase in the activation of UPRmt after exercise while in obese mice, proteostasis is basally decreased but shows a more pronounced increase with exercise. These results correlate with improvement in the circulating triglycerides, suggesting mitochondrial proteostasis could be protective and could be related to mitochondrial fuel utilization in SM.
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10
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Zhang J, Qiao W, Luo Y. Mitochondrial quality control proteases and their modulation for cancer therapy. Med Res Rev 2023; 43:399-436. [PMID: 36208112 DOI: 10.1002/med.21929] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Revised: 09/04/2022] [Accepted: 09/26/2022] [Indexed: 02/05/2023]
Abstract
Mitochondria, the main provider of energy in eukaryotic cells, contains more than 1000 different proteins and is closely related to the development of cells. However, damaged proteins impair mitochondrial function, further contributing to several human diseases. Evidence shows mitochondrial proteases are critically important for protein maintenance. Most importantly, quality control enzymes exert a crucial role in the modulation of mitochondrial functions by degrading misfolded, aged, or superfluous proteins. Interestingly, cancer cells thrive under stress conditions that damage proteins, so targeting mitochondrial quality control proteases serves as a novel regulator for cancer cells. Not only that, mitochondrial quality control proteases have been shown to affect mitochondrial dynamics by regulating the morphology of optic atrophy 1 (OPA1), which is closely related to the occurrence and progression of cancer. In this review, we introduce mitochondrial quality control proteases as promising targets and related modulators in cancer therapy with a focus on caseinolytic protease P (ClpP), Lon protease (LonP1), high-temperature requirement protein A2 (HrtA2), and OMA-1. Further, we summarize our current knowledge of the advances in clinical trials for modulators of mitochondrial quality control proteases. Overall, the content proposed above serves to suggest directions for the development of novel antitumor drugs.
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Affiliation(s)
- Jiangnan Zhang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, China
| | - Wenliang Qiao
- Lung Cancer Center, Laboratory of Lung Cancer, Western China Hospital of Sichuan University, Chengdu, China
| | - Youfu Luo
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, China
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11
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Mabanglo MF, Wong KS, Barghash MM, Leung E, Chuang SHW, Ardalan A, Majaesic EM, Wong CJ, Zhang S, Lang H, Karanewsky DS, Iwanowicz AA, Graves LM, Iwanowicz EJ, Gingras AC, Houry WA. Potent ClpP agonists with anticancer properties bind with improved structural complementarity and alter the mitochondrial N-terminome. Structure 2023; 31:185-200.e10. [PMID: 36586405 PMCID: PMC9898158 DOI: 10.1016/j.str.2022.12.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 11/01/2022] [Accepted: 11/29/2022] [Indexed: 12/31/2022]
Abstract
The mitochondrial ClpP protease is responsible for mitochondrial protein quality control through specific degradation of proteins involved in several metabolic processes. ClpP overexpression is also required in many cancer cells to eliminate reactive oxygen species (ROS)-damaged proteins and to sustain oncogenesis. Targeting ClpP to dysregulate its function using small-molecule agonists is a recent strategy in cancer therapy. Here, we synthesized imipridone-derived compounds and related chemicals, which we characterized using biochemical, biophysical, and cellular studies. Using X-ray crystallography, we found that these compounds have enhanced binding affinities due to their greater shape and charge complementarity with the surface hydrophobic pockets of ClpP. N-terminome profiling of cancer cells upon treatment with one of these compounds revealed the global proteomic changes that arise and identified the structural motifs preferred for protein cleavage by compound-activated ClpP. Together, our studies provide the structural and molecular basis by which dysregulated ClpP affects cancer cell viability and proliferation.
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Affiliation(s)
- Mark F Mabanglo
- Department of Biochemistry, University of Toronto, Toronto, ON M5G 1M1, Canada
| | - Keith S Wong
- Department of Biochemistry, University of Toronto, Toronto, ON M5G 1M1, Canada
| | - Marim M Barghash
- Department of Biochemistry, University of Toronto, Toronto, ON M5G 1M1, Canada
| | - Elisa Leung
- Department of Biochemistry, University of Toronto, Toronto, ON M5G 1M1, Canada
| | | | - Afshan Ardalan
- Department of Biochemistry, University of Toronto, Toronto, ON M5G 1M1, Canada
| | - Emily M Majaesic
- Department of Chemistry, University of Toronto, Toronto, ON M5S 3H6, Canada
| | - Cassandra J Wong
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Sinai Health, Toronto, ON M5G 1X5, Canada
| | - Shen Zhang
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Sinai Health, Toronto, ON M5G 1X5, Canada; Clinical Research Center for Reproduction and Genetics in Hunan Province, Reproductive and Genetic Hospital of CITIC-XIANGYA, Changsha, Hunan 410008, China
| | - Henk Lang
- Madera Therapeutics LLC, Cary, NC 27513, USA
| | | | | | - Lee M Graves
- Department of Pharmacology and the Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | | | - Anne-Claude Gingras
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Sinai Health, Toronto, ON M5G 1X5, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Walid A Houry
- Department of Biochemistry, University of Toronto, Toronto, ON M5G 1M1, Canada; Department of Chemistry, University of Toronto, Toronto, ON M5S 3H6, Canada.
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Sun GW, Ding TY, Wang M, Hu CL, Gu JJ, Li J, Qiu T. Honokiol Reduces Mitochondrial Dysfunction and Inhibits Apoptosis of Nerve Cells in Rats with Traumatic Brain Injury by Activating the Mitochondrial Unfolded Protein Response. J Mol Neurosci 2022; 72:2464-2472. [PMID: 36508141 DOI: 10.1007/s12031-022-02089-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 11/25/2022] [Indexed: 12/15/2022]
Abstract
This study was designed to determine the effects and underlying mechanism of honokiol (HNK) on traumatic brain injury (TBI). A rat TBI model was constructed using the modified Feeney free-fall percussion method and treatment with HNK via intraperitoneal injection. The brain tissues of the rats in each group were assessed using the terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL) assay to detect the level of neuronal apoptosis. Western blots were used to detect the expression levels of apoptosis-related proteins (Bcl-2 and Bax), and ELISAs were used to measure the levels of pro-inflammatory cytokines (IL-18 and IL-1β) and the activity of caspase-1. In addition, the mitochondrial membrane potential, reactive oxygen species (ROS), and adenosine 5'-triphosphate (ATP) were also measured. Western blots and qRT-PCRs were used to determine the relative expression levels of the mitochondrial unfolded protein response (UPRmt)-related proteins and mRNAs. Based on the experimental results, treatment with HNK was associated with a decrease in the number of TUNEL-positive cells, downregulated Bax expression levels, elevated Bcl-2 expression levels, and inhibition of neuronal apoptosis in the brain tissue of TBI rats. HNK also suppressed neuroinflammation by decreasing IL-1β and IL-18 levels and caspase-1 activity. Additionally, HNK lowered the mitochondrial membrane potential and ROS levels, increased ATP levels, and improved mitochondrial dysfunction in neural cells. Furthermore, in the investigation of the mechanism of HNK on TBI, we observed that HNK could activate UPRmt by upregulating the mRNA and protein expression levels of HSPA9, CLPP, and HSP60 in the brain tissues of TBI rats. Collectively, HNK reduced mitochondrial dysfunction, inhibited the apoptosis of nerve cells, and attenuated inflammation in the brains of TBI rats. The protective effect of HNK may be achieved through the activation of UPRmt.
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Affiliation(s)
- Guang-Wei Sun
- Department of Neurosurgery, The People's Hospital of Danyang, Affiliated Danyang Hospital of Nantong University, Danyang, 212300, Jiangsu, China
| | - Tian-Yi Ding
- Department of Imaging, The People's Hospital of Danyang, Affiliated Danyang Hospital of Nantong University, Danyang, 212300, Jiangsu, China
| | - Meng Wang
- Department of Neurosurgery, The People's Hospital of Danyang, Affiliated Danyang Hospital of Nantong University, Danyang, 212300, Jiangsu, China
| | - Chang-Long Hu
- Department of Neurosurgery, The People's Hospital of Danyang, Affiliated Danyang Hospital of Nantong University, Danyang, 212300, Jiangsu, China
| | - Jiang-Jiang Gu
- Department of Orthopedics, The People's Hospital of Danyang, Affiliated Danyang Hospital of Nantong University, Danyang, 212300, Jiangsu, China
| | - Jie Li
- Department of Neurosurgery, The People's Hospital of Danyang, Affiliated Danyang Hospital of Nantong University, Danyang, 212300, Jiangsu, China.
| | - Tao Qiu
- Department of Neurosurgery, The People's Hospital of Danyang, Affiliated Danyang Hospital of Nantong University, Danyang, 212300, Jiangsu, China.
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13
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The mitochondrial unfolded protein response (UPR mt) protects against osteoarthritis. Exp Mol Med 2022; 54:1979-1990. [PMID: 36380018 PMCID: PMC9723171 DOI: 10.1038/s12276-022-00885-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 08/30/2022] [Accepted: 09/13/2022] [Indexed: 11/16/2022] Open
Abstract
The mitochondrial unfolded protein response (UPRmt) is a mitochondrial-to-nuclear signaling pathway that is activated to maintain mitochondrial function when there is an accumulation of misfolded proteins within mitochondria. Mitochondrial function is essential for chondrocyte homeostasis, and mitochondrial dysfunction is a characteristic of osteoarthritis (OA). However, the role of the UPRmt in OA remains unclear. In the present study, the level of the UPRmt was examined in primary mouse chondrocytes subjected to different stresses and in the articular cartilage of OA model mice and OA patients. The relationship between UPRmt activation and OA progression was studied. The UPRmt was induced in primary mouse chondrocytes subjected to diverse stresses and in the cartilage of OA mice. Enhancement of the UPRmt with nicotinamide riboside (NR) significantly improved mitochondrial function, reduced chondrocyte death, attenuated OA pain, and ameliorated OA progression, and the protective effects decreased significantly in chondrocyte-specific Atf5 knockout (ATF5f/fCol2a1-CreERT2) mice. UPRmt induction was also identified in the articular cartilage of OA patients and was associated with reduced chondrocyte death, less severe hip pain, and lower levels of inflammation in synovial fluid. These findings identify the induction of the UPRmt in primary mouse chondrocytes exposed to pathological stresses and in the articular cartilage of OA model mice and OA patients. Enhancement of the UPRmt ameliorates OA progression, suggesting that the UPRmt exerts a protective effect against OA and may be a potential diagnostic and therapeutic strategy for OA.
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Zhou Z, Fan Y, Zong R, Tan K. The mitochondrial unfolded protein response: A multitasking giant in the fight against human diseases. Ageing Res Rev 2022; 81:101702. [PMID: 35908669 DOI: 10.1016/j.arr.2022.101702] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 07/15/2022] [Accepted: 07/26/2022] [Indexed: 02/06/2023]
Abstract
Mitochondria, which serve as the energy factories of cells, are involved in cell differentiation, calcium homeostasis, amino acid and fatty acid metabolism and apoptosis. In response to environmental stresses, mitochondrial homeostasis is regulated at both the organelle and molecular levels to effectively maintain the number and function of mitochondria. The mitochondrial unfolded protein response (UPRmt) is an adaptive intracellular stress mechanism that responds to stress signals by promoting the transcription of genes encoding mitochondrial chaperones and proteases. The mechanism of the UPRmt in Caenorhabditis elegans (C. elegans) has been clarified over time, and the main regulatory factors include ATFS-1, UBL-5 and DVE-1. In mammals, the activation of the UPRmt involves eIF2α phosphorylation and the uORF-regulated expression of CHOP, ATF4 and ATF5. Several additional factors, such as SIRT3 and HSF1, are also involved in regulating the UPRmt. A deep and comprehensive exploration of the UPRmt can provide new directions and strategies for the treatment of human diseases, including aging, neurodegenerative diseases, cardiovascular diseases and diabetes. In this review, we mainly discuss the function of UPRmt, describe the regulatory mechanisms of UPRmt in C. elegans and mammals, and summarize the relationship between UPRmt and various human diseases.
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Affiliation(s)
- Zixin Zhou
- Key Laboratory of Molecular and Cellular Biology of Ministry of Education, Hebei Province Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei 050024, China; State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, University of Chinese Academy of Sciences, Beijing, China
| | - Yumei Fan
- Key Laboratory of Molecular and Cellular Biology of Ministry of Education, Hebei Province Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei 050024, China
| | - Ruikai Zong
- Key Laboratory of Molecular and Cellular Biology of Ministry of Education, Hebei Province Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei 050024, China
| | - Ke Tan
- Key Laboratory of Molecular and Cellular Biology of Ministry of Education, Hebei Province Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei 050024, China.
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15
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Abstract
The brain is one of the most energetically demanding tissues in the human body, and mitochondrial pathology is strongly implicated in chronic neurodegenerative diseases. In contrast to acute brain injuries in which bioenergetics and cell death play dominant roles, studies modeling familial neurodegeneration implicate a more complex and nuanced relationship involving the entire mitochondrial life cycle. Recent literature on mitochondrial mechanisms in Parkinson's disease, Alzheimer's disease, frontotemporal dementia, Huntington's disease, and amyotrophic lateral sclerosis is reviewed with an emphasis on mitochondrial quality control, transport and synaptodendritic calcium homeostasis. Potential neuroprotective interventions include targeting the mitochondrial kinase PTEN-induced kinase 1 (PINK1), which plays a role in regulating not only multiple facets of mitochondrial biology, but also neuronal morphogenesis and dendritic arborization.
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Affiliation(s)
- Charleen T Chu
- Departments of Pathology and Ophthalmology, Pittsburgh Institute for Neurodegenerative Diseases, McGowan Institute for Regenerative Medicine, Center for Protein Conformational Diseases, Center for Neuroscience at the University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
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Wang G, Fan Y, Cao P, Tan K. Insight into the mitochondrial unfolded protein response and cancer: opportunities and challenges. Cell Biosci 2022; 12:18. [PMID: 35180892 PMCID: PMC8857832 DOI: 10.1186/s13578-022-00747-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 01/18/2022] [Indexed: 02/08/2023] Open
Abstract
The mitochondrial unfolded protein response (UPRmt) is an evolutionarily conserved protective transcriptional response that maintains mitochondrial proteostasis by inducing the expression of mitochondrial chaperones and proteases in response to various stresses. The UPRmt-mediated transcriptional program requires the participation of various upstream signaling pathways and molecules. The factors regulating the UPRmt in Caenorhabditis elegans (C. elegans) and mammals are both similar and different. Cancer cells, as malignant cells with uncontrolled proliferation, are exposed to various challenges from endogenous and exogenous stresses. Therefore, in cancer cells, the UPRmt is hijacked and exploited for the repair of mitochondria and the promotion of tumor growth, invasion and metastasis. In this review, we systematically introduce the inducers of UPRmt, the biological processes in which UPRmt participates, the mechanisms regulating the UPRmt in C. elegans and mammals, cross-tissue signal transduction of the UPRmt and the roles of the UPRmt in promoting cancer initiation and progression. Disrupting proteostasis in cancer cells by targeting UPRmt constitutes a novel anticancer therapeutic strategy.
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Affiliation(s)
- Ge Wang
- Key Laboratory of Molecular and Cellular Biology of Ministry of Education, Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, Hebei, 050024, China.,Department of Human Anatomy, Histology and Embryology, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing, 100191, China
| | - Yumei Fan
- Key Laboratory of Molecular and Cellular Biology of Ministry of Education, Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, Hebei, 050024, China
| | - Pengxiu Cao
- Key Laboratory of Molecular and Cellular Biology of Ministry of Education, Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, Hebei, 050024, China
| | - Ke Tan
- Key Laboratory of Molecular and Cellular Biology of Ministry of Education, Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, Hebei, 050024, China.
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17
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Honokiol improves cognitive impairment in APP/PS1 mice through activating mitophagy and mitochondrial unfolded protein response. Chem Biol Interact 2022; 351:109741. [PMID: 34752757 DOI: 10.1016/j.cbi.2021.109741] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Revised: 10/28/2021] [Accepted: 11/03/2021] [Indexed: 12/15/2022]
Abstract
Activated mitophagy and mitochondrial unfolded protein response (UPRmt) has been reported to protect against mitochondrial dysfunction, which is closely related to the onset of Alzheimer's disease (AD). Honokiol (HKL, C18H18O2) is a kind of natural extraction from bark of Magnolia officinalis with anti-AD effect, and our study aims to explore the effect of HKL on mitophagy and UPRmt in AD. Briefly, male APP/PS1 mice and Aβ oligmer (AβO)-treated primary hippocampal neurons were respectively used to mimic AD in vivo and in vitro. It was determined that HKL significantly ameliorated cognitive impairment and synaptic damages in APP/PS1 mice. Besides, the activated mitophagy and UPRmt together with inhibited oxidative stress and improved mitochondrial dynamic disorder were further validated in hippocampus of HKL-treated APP/PS1 mice. Meanwhile, HKL-treated mice displayed much higher hippocampal expression and activity of mitochondrial sirtuin 3 (SIRT3). Therefore, SIRT3 knockdown was further achieved in primary hippocampal neurons by effective shRNA, and we determined that HKL improved synaptic damage, mitochondrial dysfunction, mitophagy and UPRmt in AβO-treated primary hippocampal neurons in a SIRT3-dependent manner. In summary, our study validates the protective effect of HKL on AD, and highlights that HKL exerts anti-AD effect by activating mitophagy and UPRmt.
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18
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Inactivity of Peptidase ClpP Causes Primary Accumulation of Mitochondrial Disaggregase ClpX with Its Interacting Nucleoid Proteins, and of mtDNA. Cells 2021; 10:cells10123354. [PMID: 34943861 PMCID: PMC8699119 DOI: 10.3390/cells10123354] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 11/20/2021] [Accepted: 11/25/2021] [Indexed: 12/19/2022] Open
Abstract
Biallelic pathogenic variants in CLPP, encoding mitochondrial matrix peptidase ClpP, cause a rare autosomal recessive condition, Perrault syndrome type 3 (PRLTS3). It is characterized by primary ovarian insufficiency and early sensorineural hearing loss, often associated with progressive neurological deficits. Mouse models showed that accumulations of (i) its main protein interactor, the substrate-selecting AAA+ ATPase ClpX, (ii) mitoribosomes, and (iii) mtDNA nucleoids are the main cellular consequences of ClpP absence. However, the sequence of these events and their validity in human remain unclear. Here, we studied global proteome profiles to define ClpP substrates among mitochondrial ClpX interactors, which accumulated consistently in ClpP-null mouse embryonal fibroblasts and brains. Validation work included novel ClpP-mutant patient fibroblast proteomics. ClpX co-accumulated in mitochondria with the nucleoid component POLDIP2, the mitochondrial poly(A) mRNA granule element LRPPRC, and tRNA processing factor GFM1 (in mouse, also GRSF1). Only in mouse did accumulated ClpX, GFM1, and GRSF1 appear in nuclear fractions. Mitoribosomal accumulation was minor. Consistent accumulations in murine and human fibroblasts also affected multimerizing factors not known as ClpX interactors, namely, OAT, ASS1, ACADVL, STOM, PRDX3, PC, MUT, ALDH2, PMPCB, UQCRC2, and ACADSB, but the impact on downstream metabolites was marginal. Our data demonstrate the primary impact of ClpXP on the assembly of proteins with nucleic acids and show nucleoid enlargement in human as a key consequence.
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Illigmann A, Thoma Y, Pan S, Reinhardt L, Brötz-Oesterhelt H. Contribution of the Clp Protease to Bacterial Survival and Mitochondrial Homoeostasis. Microb Physiol 2021; 31:260-279. [PMID: 34438398 DOI: 10.1159/000517718] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 06/07/2021] [Indexed: 11/19/2022]
Abstract
Fast adaptation to environmental changes ensures bacterial survival, and proteolysis represents a key cellular process in adaptation. The Clp protease system is a multi-component machinery responsible for protein homoeostasis, protein quality control, and targeted proteolysis of transcriptional regulators in prokaryotic cells and prokaryote-derived organelles of eukaryotic cells. A functional Clp protease complex consists of the tetradecameric proteolytic core ClpP and a hexameric ATP-consuming Clp-ATPase, several of which can associate with the same proteolytic core. Clp-ATPases confer substrate specificity by recognising specific degradation tags, and further selectivity is conferred by adaptor proteins, together allowing for a fine-tuned degradation process embedded in elaborate regulatory networks. This review focuses on the contribution of the Clp protease system to prokaryotic survival and summarises the current state of knowledge for exemplary bacteria in an increasing degree of interaction with eukaryotic cells. Starting from free-living bacteria as exemplified by a non-pathogenic and a pathogenic member of the Firmicutes, i.e., Bacillus subtilis and Staphylococcus aureus, respectively, we turn our attention to facultative and obligate intracellular bacterial pathogens, i.e., Mycobacterium tuberculosis, Listeria monocytogenes, and Chlamydia trachomatis, and conclude with mitochondria. Under stress conditions, the Clp protease system exerts its pivotal role in the degradation of damaged proteins and controls the timing and extent of the heat-shock response by regulatory proteolysis. Key regulators of developmental programmes like natural competence, motility, and sporulation are also under Clp proteolytic control. In many pathogenic species, the Clp system is required for the expression of virulence factors and essential for colonising the host. In accordance with its evolutionary origin, the human mitochondrial Clp protease strongly resembles its bacterial counterparts, taking a central role in protein quality control and homoeostasis, energy metabolism, and apoptosis in eukaryotic cells, and several cancer cell types depend on it for proliferation.
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Affiliation(s)
- Astrid Illigmann
- Department of Microbial Bioactive Compounds, Interfaculty Institute of Microbiology and Infection Medicine, University of Tübingen, Tübingen, Germany
| | - Yvonne Thoma
- Department of Microbial Bioactive Compounds, Interfaculty Institute of Microbiology and Infection Medicine, University of Tübingen, Tübingen, Germany
| | - Stefan Pan
- Department of Microbial Bioactive Compounds, Interfaculty Institute of Microbiology and Infection Medicine, University of Tübingen, Tübingen, Germany
| | - Laura Reinhardt
- Department of Microbial Bioactive Compounds, Interfaculty Institute of Microbiology and Infection Medicine, University of Tübingen, Tübingen, Germany
| | - Heike Brötz-Oesterhelt
- Department of Microbial Bioactive Compounds, Interfaculty Institute of Microbiology and Infection Medicine, University of Tübingen, Tübingen, Germany.,Cluster of Excellence Controlling Microbes to Fight Infection, University of Tübingen, Tübingen, Germany
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20
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Mabanglo MF, Bhandari V, Houry WA. Substrates and interactors of the ClpP protease in the mitochondria. Curr Opin Chem Biol 2021; 66:102078. [PMID: 34446368 DOI: 10.1016/j.cbpa.2021.07.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 07/19/2021] [Accepted: 07/21/2021] [Indexed: 12/21/2022]
Abstract
The ClpP protease is found across eukaryotic and prokaryotic organisms. It is well-characterized in bacteria where its function is important in maintaining protein homeostasis. Along with its ATPase partners, it has been shown to play critical roles in the regulation of enzymes involved in important cellular pathways. In eukaryotes, ClpP is found within cellular organelles. Proteomic studies have begun to characterize the role of this protease in the mitochondria through its interactions. Here, we discuss the proteomic techniques used to identify its interactors and present an atlas of mitochondrial ClpP substrates. The ClpP substrate pool is extensive and consists of proteins involved in essential mitochondrial processes such as the Krebs cycle, oxidative phosphorylation, translation, fatty acid metabolism, and amino acid metabolism. Discoveries of these associations have begun to illustrate the functional significance of ClpP in human health and disease.
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Affiliation(s)
- Mark F Mabanglo
- Department of Biochemistry, University of Toronto, Toronto, Ontario, M5G 1M1, Canada
| | - Vaibhav Bhandari
- Department of Biochemistry, University of Toronto, Toronto, Ontario, M5G 1M1, Canada
| | - Walid A Houry
- Department of Biochemistry, University of Toronto, Toronto, Ontario, M5G 1M1, Canada; Department of Chemistry, University of Toronto, Toronto, Ontario, M5S 3H6, Canada.
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21
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Dai CH, Zhu LR, Wang Y, Tang XP, Du YJ, Chen YC, Li J. Celastrol acts synergistically with afatinib to suppress non-small cell lung cancer cell proliferation by inducing paraptosis. J Cell Physiol 2021; 236:4538-4554. [PMID: 33230821 DOI: 10.1002/jcp.30172] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Revised: 10/31/2020] [Accepted: 11/10/2020] [Indexed: 12/12/2022]
Abstract
Non-small cell lung cancer (NSCLC) with wild-type epidermal growth factor receptor (EGFR) is intrinsic resistance to EGFR-tyrosine kinase inhibitors (TKIs), such as afatinib. Celastrol, a natural compound with antitumor activity, was reported to induce paraptosis in cancer cells. In this study, intrinsic EGFR-TKI-resistant NSCLC cell lines H23 (EGFR wild-type and KRAS mutation) and H292 (EGFR wild-type and overexpression) were used to test whether celastrol could overcome primary afatinib resistance through paraptosis induction. The synergistic effect of celastrol and afatinib on survival inhibition of the NSCLC cells was evaluated by CCK-8 assay and isobologram analysis. The paraptosis and its modulation were assessed by light and electron microscopy, Western blot analysis, and immunofluorescence. Xenografts models were established to investigate the inhibitory effect of celastrol plus afatinib on the growth of the NSCLC tumors in vivo. Results showed that celastrol acted synergistically with afatinib to suppress the survival of H23 and H292 cells by inducing paraptosis characterized by extensive cytoplasmic vacuolation. This process was independent of apoptosis and not associated with autophagy induction. Afatinib plus celastrol-induced cytoplasmic vacuolation was preceded by endoplasmic reticulum stress and unfolded protein response. Accumulation of intracellular reactive oxygen species and mitochondrial Ca2+ overload may be initiating factors of celastrol/afatinib-induced paraptosis and subsequent cell death. Furthermore, Celastrol and afatinib synergistically suppressed the growth of H23 cell xenograft tumors in vivo. The data indicate that a combination of afatinib and celastrol may be a promising therapeutic strategy to surmount intrinsic afatinib resistance in NSCLC cells.
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Affiliation(s)
- Chun-Hau Dai
- Department of Radiation Oncology, Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Li-Rong Zhu
- Department of Pulmonary Medicine, Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Yi Wang
- Center of Medical Experiment, Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Xing-Ping Tang
- Department of Pulmonary Medicine, Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Yong-Jie Du
- Department of Pulmonary Medicine, Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Yong-Chang Chen
- Department of Physiology, Institute of Medical Science, Jiangsu University, Zhenjiang, China
| | - Jian Li
- Department of Pulmonary Medicine, Affiliated Hospital of Jiangsu University, Zhenjiang, China
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22
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Li XQ, Ren J, Wang Y, Su JY, Zhu YM, Chen CG, Long WG, Jiang Q, Li J. Synergistic killing effect of paclitaxel and honokiol in non-small cell lung cancer cells through paraptosis induction. Cell Oncol (Dordr) 2021; 44:135-150. [PMID: 32936421 DOI: 10.1007/s13402-020-00557-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 08/20/2020] [Accepted: 08/26/2020] [Indexed: 12/13/2022] Open
Abstract
PURPOSE Paclitaxel is an anticancer drug for the treatment of non-small cell lung cancer (NSCLC). However, drug-resistance remains a major problem. Honokiol is a natural component which has been found to exhibit anti-tumor activity. Paclitaxel and honokiol have been reported to be able to induce paraptosis. The aim of this study was to investigate whether honokiol can reverse paclitaxel resistance by inducing paraptosis in NSCLC cells. METHODS NSCLC cell lines H1650 (paclitaxel-sensitive), H1299 and H1650/PTX (intrinsic and acquired paclitaxel-resistant, respectively) were used to assess the cytotoxic effects of paclitaxel and honokiol. Light and transmission electron microscopy were performed to detect cytoplasmic vacuolation. In vitro cell viability and clonogenic survival assays, as well as in vivo xenograft assays were conducted to test synergistic killing effects of paclitaxel and honokiol on NSCLC cells. Western blotting, flow cytometry and immunofluorescence were performed to evaluate paraptosis-regulating mechanisms. RESULTS We found that combination treatment with paclitaxel and honokiol synergistically killed H1650, H1299 and H1650/PTX cells by inducing paraptosis, which is characterized by cytoplasmic vacuolation. Moreover, paclitaxel/honokiol treatment resulted in a significant growth delay in H1299 xenograft tumors that showed extensive cytoplasmic vacuolation. Mechanistically, proteasomal inhibition-mediated endoplasmic reticulum (ER) stress and unfolded protein responses leading to ER dilation, and the disruption of intracellular Ca2+ homeostasis and mitochondrial Ca2+ overload resulting in mitochondrial disfunction, were found to be involved in paclitaxel/honokiol-induced paraptosis. Cellular protein light chain 3 (LC3) may play an important role in paclitaxel/honokiol induced cytoplasmic vacuolation and NSCLC cell death. CONCLUSIONS Combination of honokiol and paclitaxel may represent a novel strategy for the treatment of paclitaxel-resistant NSCLC.
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Affiliation(s)
- Xiao-Qin Li
- Department of Medical Oncology, Affiliated Hospital of Jiangsu University, Zhenjiang, 212001, Jiangsu, China
| | - Jing Ren
- Department of Medical Oncology, Affiliated Hospital of Jiangsu University, Zhenjiang, 212001, Jiangsu, China
| | - Yi Wang
- Center of Experimental Medicine, Affiliated Hospital of Jiangsu University, Zhenjiang, 212001, Jiangsu, China
| | - Jin-Yu Su
- Department of Pulmonary Medicine, Affiliated Hospital of Jiangsu University, Zhenjiang, 212001, Jiangsu, China
| | - Yu-Min Zhu
- Department of Pulmonary Medicine, Affiliated Hospital of Jiangsu University, Zhenjiang, 212001, Jiangsu, China
| | - Chen-Guo Chen
- Department of Pulmonary Medicine, Affiliated Hospital of Jiangsu University, Zhenjiang, 212001, Jiangsu, China
| | - Wei-Guo Long
- Department of Pathology, Affiliated Hospital of Jiangsu University, Zhenjiang, 212001, Jiangsu, China
| | - Qian Jiang
- Center of Experimental Medicine, Affiliated Hospital of Jiangsu University, Zhenjiang, 212001, Jiangsu, China
| | - Jian Li
- Department of Pulmonary Medicine, Affiliated Hospital of Jiangsu University, Zhenjiang, 212001, Jiangsu, China.
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Smyrnias I. The mitochondrial unfolded protein response and its diverse roles in cellular stress. Int J Biochem Cell Biol 2021; 133:105934. [PMID: 33529716 DOI: 10.1016/j.biocel.2021.105934] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 01/03/2021] [Accepted: 01/12/2021] [Indexed: 12/12/2022]
Abstract
Mitochondrial function is centrally involved in many cellular processes, such as energy production, metabolism of nucleotides, amino acids, and lipids, calcium buffering, and regulation of cell death. Multiple mechanisms are engaged under conditions of mitochondrial dysfunction to restore cellular and, subsequently, systemic functions. The mitochondrial unfolded protein response is a homeostatic mechanism that has attracted a lot of interest recently and has been described in several organisms, including humans. The mitochondrial unfolded protein response serves as a first-line-of-defence mechanism against stress to restore mitochondrial proteostasis and functions. Here, we discuss the canonical mechanisms via which the mitochondrial unfolded protein response is activated under stress and examine recent evidence that links the response with other processes that promote survival and the recovery of the mitochondrial network (i.e. the integrated stress response and mitophagy).
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Affiliation(s)
- Ioannis Smyrnias
- Faculty of Health and Medical Sciences, University of Surrey, Guildford, GU2 7AL, United Kingdom.
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24
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Ould Amer Y, Hebert-Chatelain E. Insight into the Interactome of Intramitochondrial PKA Using Biotinylation-Proximity Labeling. Int J Mol Sci 2020; 21:ijms21218283. [PMID: 33167377 PMCID: PMC7663848 DOI: 10.3390/ijms21218283] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 10/30/2020] [Accepted: 11/02/2020] [Indexed: 12/14/2022] Open
Abstract
Mitochondria are fully integrated in cell signaling. Reversible phosphorylation is involved in adjusting mitochondrial physiology to the cellular needs. Protein kinase A (PKA) phosphorylates several substrates present at the external surface of mitochondria to maintain cellular homeostasis. However, few targets of PKA located inside the organelle are known. The aim of this work was to characterize the impact and the interactome of PKA located inside mitochondria. Our results show that the overexpression of intramitochondrial PKA decreases cellular respiration and increases superoxide levels. Using proximity-dependent biotinylation, followed by LC-MS/MS analysis and in silico phospho-site prediction, we identified 21 mitochondrial proteins potentially targeted by PKA. We confirmed the interaction of PKA with TIM44 using coimmunoprecipitation and observed that TIM44-S80 is a key residue for the interaction between the protein and the kinase. These findings provide insights into the interactome of intramitochondrial PKA and suggest new potential mechanisms in the regulation of mitochondrial functions.
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Affiliation(s)
- Yasmine Ould Amer
- Department of Biology, University of Moncton, Moncton, NB E1A 3E9, Canada;
- Canada Research Chair in Mitochondrial Signaling and Physiopathology, University of Moncton, Moncton, NB E1A 3E9, Canada
| | - Etienne Hebert-Chatelain
- Department of Biology, University of Moncton, Moncton, NB E1A 3E9, Canada;
- Canada Research Chair in Mitochondrial Signaling and Physiopathology, University of Moncton, Moncton, NB E1A 3E9, Canada
- Correspondence:
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25
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Urbina-Varela R, Castillo N, Videla LA, del Campo A. Impact of Mitophagy and Mitochondrial Unfolded Protein Response as New Adaptive Mechanisms Underlying Old Pathologies: Sarcopenia and Non-Alcoholic Fatty Liver Disease. Int J Mol Sci 2020; 21:E7704. [PMID: 33081022 PMCID: PMC7589512 DOI: 10.3390/ijms21207704] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 10/08/2020] [Accepted: 10/12/2020] [Indexed: 12/12/2022] Open
Abstract
Mitochondria are the first-line defense of the cell in the presence of stressing processes that can induce mitochondrial dysfunction. Under these conditions, the activation of two axes is accomplished, namely, (i) the mitochondrial unfolded protein response (UPRmt) to promote cell recovery and survival of the mitochondrial network; (ii) the mitophagy process to eliminate altered or dysfunctional mitochondria. For these purposes, the former response induces the expression of chaperones, proteases, antioxidant components and protein import and assembly factors, whereas the latter is signaled through the activation of the PINK1/Parkin and BNIP3/NIX pathways. These adaptive mechanisms may be compromised during aging, leading to the development of several pathologies including sarcopenia, defined as the loss of skeletal muscle mass and performance; and non-alcoholic fatty liver disease (NAFLD). These age-associated diseases are characterized by the progressive loss of organ function due to the accumulation of reactive oxygen species (ROS)-induced damage to biomolecules, since the ability to counteract the continuous and large generation of ROS becomes increasingly inefficient with aging, resulting in mitochondrial dysfunction as a central pathogenic mechanism. Nevertheless, the role of the integrated stress response (ISR) involving UPRmt and mitophagy in the development and progression of these illnesses is still a matter of debate, considering that some studies indicate that the prolonged exposure to low levels of stress may trigger these mechanisms to maintain mitohormesis, whereas others sustain that chronic activation of them could lead to cell death. In this review, we discuss the available research that contributes to unveil the role of the mitochondrial UPR in the development of sarcopenia, in an attempt to describe changes prior to the manifestation of severe symptoms; and in NAFLD, in order to prevent or reverse fat accumulation and its progression by means of suitable protocols to be addressed in future studies.
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Affiliation(s)
- Rodrigo Urbina-Varela
- Laboratorio de Fisiología y Bioenergética Celular, Departamento de Farmacia, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7810000, Chile; (R.U.-V.); (N.C.)
| | - Nataly Castillo
- Laboratorio de Fisiología y Bioenergética Celular, Departamento de Farmacia, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7810000, Chile; (R.U.-V.); (N.C.)
| | - Luis A. Videla
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago 8380453, Chile;
| | - Andrea del Campo
- Laboratorio de Fisiología y Bioenergética Celular, Departamento de Farmacia, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7810000, Chile; (R.U.-V.); (N.C.)
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Muñoz-Carvajal F, Sanhueza M. The Mitochondrial Unfolded Protein Response: A Hinge Between Healthy and Pathological Aging. Front Aging Neurosci 2020; 12:581849. [PMID: 33061907 PMCID: PMC7518384 DOI: 10.3389/fnagi.2020.581849] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 08/24/2020] [Indexed: 12/12/2022] Open
Abstract
Aging is the time-dependent functional decline that increases the vulnerability to different forms of stress, constituting the major risk factor for the development of neurodegenerative diseases. Dysfunctional mitochondria significantly contribute to aging phenotypes, accumulating particularly in post-mitotic cells, including neurons. To cope with deleterious effects, mitochondria feature different mechanisms for quality control. One such mechanism is the mitochondrial unfolded protein response (UPRMT), which corresponds to the transcriptional activation of mitochondrial chaperones, proteases, and antioxidant enzymes to repair defective mitochondria. Transcription of target UPRMT genes is epigenetically regulated by Histone 3-specific methylation. Age-dependency of this regulation could explain a differential UPRMT activity in early developmental stages or aged organisms. At the same time, precise tuning of mitochondrial stress responses is crucial for maintaining neuronal homeostasis. However, compared to other mitochondrial and stress response programs, the role of UPRMT in neurodegenerative disease is barely understood and studies in this topic are just emerging. In this review, we document the reported evidence characterizing the evolutionarily conserved regulation of the UPRMT and summarize the recent advances in understanding the role of the pathway in neurodegenerative diseases and aging.
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Affiliation(s)
- Francisco Muñoz-Carvajal
- Center for Integrative Biology, Facultad de Ciencias, Universidad Mayor, Santiago, Chile
- Escuela de Biotecnología, Facultad de Ciencias, Universidad Mayor, Santiago, Chile
- Fondap Geroscience Center for Brain Health and Metabolism, Santiago, Chile
| | - Mario Sanhueza
- Center for Integrative Biology, Facultad de Ciencias, Universidad Mayor, Santiago, Chile
- Escuela de Biotecnología, Facultad de Ciencias, Universidad Mayor, Santiago, Chile
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Bornstein R, Gonzalez B, Johnson SC. Mitochondrial pathways in human health and aging. Mitochondrion 2020; 54:72-84. [PMID: 32738358 PMCID: PMC7508824 DOI: 10.1016/j.mito.2020.07.007] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 07/20/2020] [Accepted: 07/27/2020] [Indexed: 12/27/2022]
Abstract
Mitochondria are eukaryotic organelles known best for their roles in energy production and metabolism. While often thought of as simply the 'powerhouse of the cell,' these organelles participate in a variety of critical cellular processes including reactive oxygen species (ROS) production, regulation of programmed cell death, modulation of inter- and intracellular nutrient signaling pathways, and maintenance of cellular proteostasis. Disrupted mitochondrial function is a hallmark of eukaryotic aging, and mitochondrial dysfunction has been reported to play a role in many aging-related diseases. While mitochondria are major players in human diseases, significant questions remain regarding their precise mechanistic role. In this review, we detail mechanisms by which mitochondrial dysfunction participate in disease and aging based on findings from model organisms and human genetics studies.
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Affiliation(s)
| | - Brenda Gonzalez
- Department of Genetics, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Simon C Johnson
- Department of Neurology, University of Washington, Seattle, WA, USA; Department of Anesthesiology and Pain Medicine, University of Washington, Seattle, WA, USA; Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, WA, USA.
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28
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Mitochondrial dynamics and quality control are altered in a hepatic cell culture model of cancer cachexia. Mol Cell Biochem 2020; 476:23-34. [PMID: 32797334 DOI: 10.1007/s11010-020-03882-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 08/07/2020] [Indexed: 01/06/2023]
Abstract
Hepatic mitochondrial function loss is associated with cancer cachexia pathology in vivo. Here, we examined if hepatic mitochondrial defects observed in vivo in the cachexic liver also recapitulate during the in vitro treatment of mouse hepatocytes with tumor conditioned media. In vitro experiments were combined with proteome-wide expression analysis of cachexic liver tissue curated for mitochondrial dynamics and quality control proteins, to determine the fidelity of hepatic mitochondrial maladaptation in cancer cachexia pathology. AML12 hepatocytes were exposed to colon-26 (C26) and Lewis lung carcinoma (LLC) conditioned media for 6-72 h and assayed for cell viability, membrane potential, respiratory function, H2O2 production, total ROS/RNS, and mitochondrial dynamics and quality control proteins by immunoblotting. Liver tissue from cachexic C26 mice was analyzed by TMT-based quantitative proteomics for in vivo comparison. Cell viability, membrane potential, H2O2 production, total ROS/RNS, and respiration were decreased 48-72 h after exposure to C26 and/or LLC. Protein expression of treated hepatocytes and cachexic liver tissue showed altered mitochondrial dynamics and quality control, in a manner that suggests limited fusion and content mixing, but also impaired ability to fragment and clear damaged mitochondria. Two strategies to maintain mitochondrial health, therefore, may not be functioning sufficiently in the cachexic liver. Together these findings imply adverse effects of C26 and LLC exposure on hepatocyte health, due to impaired mitochondrial function and remodeling. Exposure of mouse hepatocytes to tumor conditioned media models aspects of cachexic liver mitochondria dysfunction in vivo and validates the importance of hepatic mitochondrial maladaptation in cancer cachexia pathology.
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29
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Kalvala AK, Khan I, Gundu C, Kumar A. An Overview on ATP Dependent and Independent Proteases Including an Anterograde to Retrograde Control on Mitochondrial Function; Focus on Diabetes and Diabetic Complications. Curr Pharm Des 2020; 25:2584-2594. [PMID: 31317835 DOI: 10.2174/1381612825666190718153901] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 07/12/2019] [Indexed: 12/17/2022]
Abstract
Mitochondria are the central power stations of the cell involved with a myriad of cell signalling pathways that contribute for whole health status of the cell. It is a well known fact that not only mitochondrial genome encodes for mitochondrial proteins but there are several other mitochondrial specific proteins encoded by nuclear genome which regulate plethora of cell catabolic and anabolic process. Anterograde pathways include nuclear gene encoded proteins and their specific transport into the mitochondria and regulation of mitochondrial homeostasis. The retrograde pathways include crosstalk between the mitochondria and cytoplasmic proteins. Indeed, ATP dependent and independent proteases are identified to be very critical in balancing anterograde to retrograde signalling and vice versa to maintain the cell viability or cell death. Different experimental studies conducted on silencing the genes of these proteases have shown embryonic lethality, cancer cells death, increased hepatic glucose output, insulin tolerance, increased protein exclusion bodies, mitochondrial dysfunction, and defect in mitochondrial biogenesis, increased inflammation, Apoptosis etc. These experimental studies included from eubacteria to eukaryotes. Hence, many lines of theories proposed these proteases are conservative from eubacteria to eukaryotes. However, the regulation of these proteases at gene level is not clearly understood and still research is warranted. In this review, we articulated the origin and regulation of these proteases and the cross talk between the nucleus and mitochondria vice versa, and highlighted the role of these proteases in diabetes and diabetic complications in human diseases.
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Affiliation(s)
- Anil Kumar Kalvala
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER)-Hyderabad, Bala Nagar, India
| | - Islauddin Khan
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER)-Hyderabad, Bala Nagar, India
| | - Chayanika Gundu
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER)-Hyderabad, Bala Nagar, India
| | - Ashutosh Kumar
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER)-Hyderabad, Bala Nagar, India
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30
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Gupta A, Ökesli-Armlovich A, Morgens D, Bassik MC, Khosla C. A genome-wide analysis of targets of macrolide antibiotics in mammalian cells. J Biol Chem 2020; 295:2057-2067. [PMID: 31915244 DOI: 10.1074/jbc.ra119.010770] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 01/05/2020] [Indexed: 01/04/2023] Open
Abstract
Macrolide antibiotics, such as erythromycin and josamycin, are natural polyketide products harboring 14- to 16-membered macrocyclic lactone rings to which various sugars are attached. These antibiotics are used extensively in the clinic because of their ability to inhibit bacterial protein synthesis. More recently, some macrolides have been shown to also possess anti-inflammatory and other therapeutic activities in mammalian cells. To better understand the targets and effects of this drug class in mammalian cells, we used a genome-wide shRNA screen in K562 cancer cells to identify genes that modulate cellular sensitivity to josamycin. Among the most sensitizing hits were proteins involved in mitochondrial translation and the mitochondrial unfolded protein response, glycolysis, and the mitogen-activated protein kinase signaling cascade. Further analysis revealed that cells treated with josamycin or other antibacterial agents exhibited impaired oxidative phosphorylation and metabolic shifts to glycolysis. Interestingly, we observed that knockdown of the mitogen-activated protein kinase kinase kinase 4 (MAP3K4) gene, which contributes to p38 mitogen-activated protein kinase signaling, sensitized cells only to josamycin but not to other antibacterial agents. There is a growing interest in better characterizing the therapeutic effects and toxicities of antibiotics in mammalian cells to guide new applications in both cellular and clinical studies. To our knowledge, this is the first report of an unbiased genome-wide screen to investigate the effects of a clinically used antibiotic on human cells.
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Affiliation(s)
- Amita Gupta
- Department of Chemical Engineering, Stanford University, Stanford, California 94305; Stanford Chemistry, Engineering and Medicine for Human Health (ChEM-H), Stanford University, Stanford, California 94305
| | - Aye Ökesli-Armlovich
- Stanford Chemistry, Engineering and Medicine for Human Health (ChEM-H), Stanford University, Stanford, California 94305; Department of Chemistry, Stanford University, Stanford, California 94305
| | - David Morgens
- Department of Genetics, Stanford University, Stanford, California 94305
| | - Michael C Bassik
- Stanford Chemistry, Engineering and Medicine for Human Health (ChEM-H), Stanford University, Stanford, California 94305; Department of Genetics, Stanford University, Stanford, California 94305
| | - Chaitan Khosla
- Department of Chemical Engineering, Stanford University, Stanford, California 94305; Stanford Chemistry, Engineering and Medicine for Human Health (ChEM-H), Stanford University, Stanford, California 94305; Department of Chemistry, Stanford University, Stanford, California 94305; Department of Biochemistry, Stanford University, Stanford, California 94305.
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31
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Key J, Kohli A, Bárcena C, López-Otín C, Heidler J, Wittig I, Auburger G. Global Proteome of LonP1+/- Mouse Embryonal Fibroblasts Reveals Impact on Respiratory Chain, but No Interdependence between Eral1 and Mitoribosomes. Int J Mol Sci 2019; 20:E4523. [PMID: 31547314 PMCID: PMC6770551 DOI: 10.3390/ijms20184523] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 09/02/2019] [Accepted: 09/09/2019] [Indexed: 12/11/2022] Open
Abstract
Research on healthy aging shows that lifespan reductions are often caused by mitochondrial dysfunction. Thus, it is very interesting that the deletion of mitochondrial matrix peptidase LonP1 was observed to abolish embryogenesis, while deletion of the mitochondrial matrix peptidase Caseinolytic Mitochondrial Matrix Peptidase Proteolytic Subunit (ClpP) prolonged survival. To unveil the targets of each enzyme, we documented the global proteome of LonP1+/- mouse embryonal fibroblasts (MEF), for comparison with ClpP-/- depletion. Proteomic profiles of LonP1+/- MEF generated by label-free mass spectrometry were further processed with the STRING (Search tool for the retrieval of interacting genes) webserver Heidelberg for protein interactions. ClpP was previously reported to degrade Eral1 as a chaperone involved in mitoribosome assembly, so ClpP deficiency triggers the accumulation of mitoribosomal subunits and inefficient translation. LonP1+/- MEF also showed Eral1 accumulation, but no systematic effect on mitoribosomal subunits. In contrast to ClpP-/- profiles, several components of the respiratory complex-I membrane arm, of the glutathione pathway and of lysosomes were accumulated, whereas the upregulation of numerous innate immune defense components was similar. Overall, LonP1, as opposed to ClpP, appears to have no effect on translational machinery, instead it shows enhanced respiratory dysfunction; this agrees with reports on the human CODAS syndrome (syndrome with cerebral, ocular, dental, auricular, and skeletal anomalies) caused by LonP1 mutations.
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Affiliation(s)
- Jana Key
- Experimental Neurology, Goethe University Medical School, 60590 Frankfurt am Main, Germany.
| | - Aneesha Kohli
- Experimental Neurology, Goethe University Medical School, 60590 Frankfurt am Main, Germany.
| | - Clea Bárcena
- Departamento de Bioquimica y Biologia Molecular, Facultad de Medicina, Instituto Universitario de Oncologia (IUOPA), Universidad de Oviedo, 33006 Oviedo, Spain.
| | - Carlos López-Otín
- Departamento de Bioquimica y Biologia Molecular, Facultad de Medicina, Instituto Universitario de Oncologia (IUOPA), Universidad de Oviedo, 33006 Oviedo, Spain.
| | - Juliana Heidler
- Functional Proteomics Group, Goethe-University Hospital, 60590 Frankfurt am Main, Germany.
| | - Ilka Wittig
- Functional Proteomics Group, Goethe-University Hospital, 60590 Frankfurt am Main, Germany.
| | - Georg Auburger
- Experimental Neurology, Goethe University Medical School, 60590 Frankfurt am Main, Germany.
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32
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Wu G, Xiong Q, Wei X, Wang Y, Hu X, He G, Liu L, Lai Q, Dai Z, Anushesh D, Xu Y. Mitochondrial unfolded protein response gene CLPP changes mitochondrial dynamics and affects mitochondrial function. PeerJ 2019; 7:e7209. [PMID: 31304066 PMCID: PMC6611452 DOI: 10.7717/peerj.7209] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 05/29/2019] [Indexed: 12/12/2022] Open
Abstract
Mitochondrial dynamics is associated with mitochondrial function, which is associated with diabetes. Although an important indicator of the mitochondrial unfolded protein response, to the best of our knowledge, CLPP and its effects on mitochondrial dynamics in islet cells have not been studied to date. We analyzed the effects of CLPP on mitochondrial dynamics and mitochondrial function in the mice islet β-cell line Min6 under high glucose and high fat conditions. Min6 cells were assigned to: Normal, HG, HG+NC, HG+siCLPP, HF, HF+NC and HF+ siCLPP groups. High glucose and high fat can promote the mRNA and protein expression of CLPP in mitochondria. The increase of mitochondrial fission, the decrese of mitochondrial fusion, and the damage of mintocondrial ultrastructure were significant in the siCLPP cell groups as compared to no-siCLPP treated groups. Meanwhile, mitochondrial functions of MIN6 cells treated with siCLPP were impaired, such as ATP decreased, ROS increased, mitochondrial membrane potential decreased. In addition, cell insulin secretion decreased and cell apoptosis rate increased in siCLPP groups. These results revealed that mitochondrial unfolded protein response geneCLPP alleviated high glucose and high fat-induced mitochondrial dynamics imbalance and mitochondrial dysfunction.
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Affiliation(s)
- GuiJun Wu
- Department of Endocrinology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Qing Xiong
- Department of Endocrinology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - XiaoJun Wei
- Emergency Centre, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Ye Wang
- Department of Endocrinology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - XueMei Hu
- Department of Endocrinology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - GuangZhen He
- Department of Endocrinology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - LinJie Liu
- Department of Endocrinology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - QianHui Lai
- Department of Endocrinology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Zhe Dai
- Department of Endocrinology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Dhakal Anushesh
- Department of Endocrinology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Yancheng Xu
- Department of Endocrinology, Zhongnan Hospital of Wuhan University, Wuhan, China
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Gambogic acid triggers vacuolization-associated cell death in cancer cells via disruption of thiol proteostasis. Cell Death Dis 2019; 10:187. [PMID: 30796201 PMCID: PMC6385239 DOI: 10.1038/s41419-019-1360-4] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 12/25/2018] [Accepted: 01/09/2019] [Indexed: 11/08/2022]
Abstract
Gambogic acid (GA), a xanthonoid extracted from the resin of the tree, Garcinia hanburyi, was recently shown to exert anticancer activity in multiple studies, but the underlying action mechanism remains unclear. Here, we show that GA induces cancer cell death accompanied by vacuolation in vitro and in vivo. This GA-induced vacuolation in various cancer cells was derived from dilation of the endoplasmic reticulum (ER) and mitochondria, and was blocked by cycloheximide. These findings suggest that GA kills cancer cells by inducing paraptosis, a vacuolization-associated cell death. We found that megamitochondria formation, which arose from the fusion of swollen mitochondria, preceded the fusion of ER-derived vacuoles. GA-induced proteasomal inhibition was found to contribute to the ER dilation and ER stress seen in treated cancer cells, and megamitochondria formation was followed by mitochondrial membrane depolarization. Interestingly, GA-induced paraptosis was effectively blocked by various thiol-containing antioxidants, and this effect was independent of ROS generation. We observed that GA can react with cysteinyl thiol to form Michael adducts, suggesting that the ability of GA to covalently modify the nucleophilic cysteinyl groups of proteins may cause protein misfolding and subsequent accumulation of misfolded proteins within the ER and mitochondria. Collectively, our findings show that disruption of thiol proteostasis and subsequent paraptosis may critically contribute to the anti-cancer effects of GA.
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Wong KS, Houry WA. Recent Advances in Targeting Human Mitochondrial AAA+ Proteases to Develop Novel Cancer Therapeutics. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1158:119-142. [PMID: 31452139 DOI: 10.1007/978-981-13-8367-0_8] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The mitochondrion is a vital organelle that performs diverse cellular functions. In this regard, the cell has evolved various mechanisms dedicated to the maintenance of the mitochondrial proteome. Among them, AAA+ ATPase-associated proteases (AAA+ proteases) such as the Lon protease (LonP1), ClpXP complex, and the membrane-bound i-AAA, m-AAA and paraplegin facilitate the clearance of misfolded mitochondrial proteins to prevent the accumulation of cytotoxic protein aggregates. Furthermore, these proteases have additional regulatory functions in multiple biological processes that include amino acid metabolism, mitochondria DNA transcription, metabolite and cofactor biosynthesis, maturation and turnover of specific respiratory and metabolic proteins, and modulation of apoptosis, among others. In cancer cells, the increase in intracellular ROS levels promotes tumorigenic phenotypes and increases the frequency of protein oxidation and misfolding, which is compensated by the increased expression of specific AAA+ proteases as part of the adaptation mechanism. The targeting of AAA+ proteases has led to the discovery and development of novel anti-cancer compounds. Here, we provide an overview of the molecular characteristics and functions of the major mitochondrial AAA+ proteases and summarize recent research efforts in the development of compounds that target these proteases.
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Affiliation(s)
- Keith S Wong
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Walid A Houry
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada. .,Department of Chemistry, University of Toronto, Toronto, ON, Canada.
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35
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Ogorodnikov A, Levin M, Tattikota S, Tokalov S, Hoque M, Scherzinger D, Marini F, Poetsch A, Binder H, Macher-Göppinger S, Probst HC, Tian B, Schaefer M, Lackner KJ, Westermann F, Danckwardt S. Transcriptome 3'end organization by PCF11 links alternative polyadenylation to formation and neuronal differentiation of neuroblastoma. Nat Commun 2018; 9:5331. [PMID: 30552333 PMCID: PMC6294251 DOI: 10.1038/s41467-018-07580-5] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 11/08/2018] [Indexed: 12/12/2022] Open
Abstract
Diversification at the transcriptome 3'end is an important and evolutionarily conserved layer of gene regulation associated with differentiation and dedifferentiation processes. Here, we identify extensive transcriptome 3'end-alterations in neuroblastoma, a tumour entity with a paucity of recurrent somatic mutations and an unusually high frequency of spontaneous regression. Utilising extensive RNAi-screening we reveal the landscape and drivers of transcriptome 3'end-diversification, discovering PCF11 as critical regulator, directing alternative polyadenylation (APA) of hundreds of transcripts including a differentiation RNA-operon. PCF11 shapes inputs converging on WNT-signalling, and governs cell cycle, proliferation, apoptosis and neurodifferentiation. Postnatal PCF11 down-regulation induces a neurodifferentiation program, and low-level PCF11 in neuroblastoma associates with favourable outcome and spontaneous tumour regression. Our findings document a critical role for APA in tumorigenesis and describe a novel mechanism for cell fate reprogramming in neuroblastoma with potentially important clinical implications. We provide an interactive data repository of transcriptome-wide APA covering > 170 RNAis, and an APA-network map with regulatory hubs.
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Affiliation(s)
- Anton Ogorodnikov
- Posttranscriptional Gene Regulation, Cancer Research and Experimental Haemostasis, University Medical Centre Mainz, Mainz, 55131, Germany
- Institute for Clinical Chemistry and Laboratory Medicine, University Medical Centre Mainz, Mainz, 55131, Germany
- Centre for Thrombosis and Haemostasis (CTH), University Medical Centre Mainz, Mainz, 55131, Germany
- McManus Laboratory, University of California San Francisco (UCSF), San Francisco, CA, 94143, USA
| | - Michal Levin
- Posttranscriptional Gene Regulation, Cancer Research and Experimental Haemostasis, University Medical Centre Mainz, Mainz, 55131, Germany
- Institute for Clinical Chemistry and Laboratory Medicine, University Medical Centre Mainz, Mainz, 55131, Germany
- Centre for Thrombosis and Haemostasis (CTH), University Medical Centre Mainz, Mainz, 55131, Germany
| | - Surendra Tattikota
- Posttranscriptional Gene Regulation, Cancer Research and Experimental Haemostasis, University Medical Centre Mainz, Mainz, 55131, Germany
- Institute for Clinical Chemistry and Laboratory Medicine, University Medical Centre Mainz, Mainz, 55131, Germany
- Centre for Thrombosis and Haemostasis (CTH), University Medical Centre Mainz, Mainz, 55131, Germany
| | - Sergey Tokalov
- Posttranscriptional Gene Regulation, Cancer Research and Experimental Haemostasis, University Medical Centre Mainz, Mainz, 55131, Germany
- Institute for Clinical Chemistry and Laboratory Medicine, University Medical Centre Mainz, Mainz, 55131, Germany
- Centre for Thrombosis and Haemostasis (CTH), University Medical Centre Mainz, Mainz, 55131, Germany
| | - Mainul Hoque
- Rutgers New Jersey Medical School, Newark, NJ, 07103, USA
| | - Denise Scherzinger
- Institute of Medical Biostatistics, Epidemiology and Informatics, University Medical Centre Mainz, Mainz, 55131, Germany
| | - Federico Marini
- Centre for Thrombosis and Haemostasis (CTH), University Medical Centre Mainz, Mainz, 55131, Germany
- Institute of Medical Biostatistics, Epidemiology and Informatics, University Medical Centre Mainz, Mainz, 55131, Germany
| | - Ansgar Poetsch
- Max-Planck-Institute for Heart and Lung Research, Bad Nauheim, 61231, Germany
- Institute for Plant Biochemistry, Ruhr-University Bochum, Bochum, 44801, Germany
- School of Biomedical & Healthcare Sciences, Plymouth University, Plymouth, PL4 8AA, United Kingdom
| | - Harald Binder
- Institute of Medical Biometry and Statistics, Faculty of Medicine and Medical Center-University of Freiburg, Freiburg, 79104, Germany
| | | | - Hans Christian Probst
- Institute for Immunology, University Medical Centre Mainz, Mainz, 55131, Germany
- Research Center for Immunotherapy (FZI), University Medical Centre Mainz, Mainz, 55131, Germany
| | - Bin Tian
- Rutgers New Jersey Medical School, Newark, NJ, 07103, USA
| | - Michael Schaefer
- Department of Anaesthesiology and Research Centre Translational Neurosciences, University Medical Centre Mainz, Mainz, 55131, Germany
| | - Karl J Lackner
- Institute for Clinical Chemistry and Laboratory Medicine, University Medical Centre Mainz, Mainz, 55131, Germany
| | - Frank Westermann
- Division of Neuroblastoma Genomics, German Cancer Research Centre (DKFZ), Heidelberg, 69120, Germany
| | - Sven Danckwardt
- Posttranscriptional Gene Regulation, Cancer Research and Experimental Haemostasis, University Medical Centre Mainz, Mainz, 55131, Germany.
- Institute for Clinical Chemistry and Laboratory Medicine, University Medical Centre Mainz, Mainz, 55131, Germany.
- Centre for Thrombosis and Haemostasis (CTH), University Medical Centre Mainz, Mainz, 55131, Germany.
- German Centre for Cardiovascular Research (DZHK), Mainz, 55131, Germany.
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Abstract
Mitochondria are sensitive to numerous environmental stresses, which can lead to activation of mitochondrial stress responses (MSRs). Of particular recent interest has been the mitochondrial unfolded protein response (UPRmt), activated to restore protein homeostasis (proteostasis) upon mitochondrial protein misfolding. Several axes of the UPRmt have been described, creating some confusion as to the nature of the different responses. While distinct molecularly, these different axes are likely mutually beneficial and activated in parallel. This review aims at describing and distinguishing the different mammalian MSR/UPRmt axes to define key processes and members and to examine the involvement of protein misfolding.
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Affiliation(s)
- Christian Münch
- Institute of Biochemistry II, Goethe University - Medical Faculty, University Hospital, Frankfurt am Main, Germany.
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Kumari P, Popescu D, Yue S, Bober E, Ianni A, Braun T. Sirt7 inhibits Sirt1-mediated activation of Suv39h1. Cell Cycle 2018; 17:1403-1412. [PMID: 29963979 PMCID: PMC6132954 DOI: 10.1080/15384101.2018.1486166] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Sirtuins regulate a variety of cellular processes through protein deacetylation. The best-known member of mammalian sirtuin family, Sirt1, plays important roles in the maintenance of cellular homeostasis by regulating cell metabolism, differentiation and stress responses, among others. Sirt1 activity requires tight regulation to meet specific cellular requirements, which is achieved at different levels and by specific mechanisms. Recently, a regulatory loop between Sirt1 and another sirtuin, Sirt7, was identified. Sirt7 inhibits Sirt1 autodeacetylation at K230 and activation thereby preventing Sirt1-mediated repression of adipocyte differentiation by inhibition of the PPARγ gene. Here, we extend the regulatory complexity of Sirt7-dependent restriction of Sirt1 activity by demonstrating that Sirt7 reduces activation of a previously described prominent Sirt1 target, the histone methyltransferase Suv39h1. We show that removal of the acetyl-group at K230 in Sirt1 due to the absence of Sirt7 leads to hyperactivation of Sirt1 and thereby to constantly increased activity of Suv39h1.
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Affiliation(s)
- Poonam Kumari
- a Department of Cardiac Development and Remodeling , Max-Planck-Institute for Heart and Lung Research , Bad Nauheim , Germany
| | - Daniela Popescu
- a Department of Cardiac Development and Remodeling , Max-Planck-Institute for Heart and Lung Research , Bad Nauheim , Germany
| | - Shijing Yue
- b The State Key Laboratory of Medicinal Chemical Biology, School of Medicine , Nankai University , Tianjin , China.,c The State International Science & Technology Cooperation Base of Tumor Immunology and Biological Vaccines , Nankai University , Tianjin , China
| | - Eva Bober
- a Department of Cardiac Development and Remodeling , Max-Planck-Institute for Heart and Lung Research , Bad Nauheim , Germany
| | - Alessandro Ianni
- a Department of Cardiac Development and Remodeling , Max-Planck-Institute for Heart and Lung Research , Bad Nauheim , Germany
| | - Thomas Braun
- a Department of Cardiac Development and Remodeling , Max-Planck-Institute for Heart and Lung Research , Bad Nauheim , Germany
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38
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Eremina L, Pashintseva N, Kovalev L, Kovaleva M, Shishkin S. Proteomics of mammalian mitochondria in health and malignancy: From protein identification to function. Anal Biochem 2018; 552:4-18. [DOI: 10.1016/j.ab.2017.03.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 03/07/2017] [Accepted: 03/23/2017] [Indexed: 12/28/2022]
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Heine T, Zimmerling J, Ballmann A, Kleeberg SB, Rückert C, Busche T, Winkler A, Kalinowski J, Poetsch A, Scholtissek A, Oelschlägel M, Schmidt G, Tischler D. On the Enigma of Glutathione-Dependent Styrene Degradation in Gordonia rubripertincta CWB2. Appl Environ Microbiol 2018; 84:e00154-18. [PMID: 29475871 PMCID: PMC5930330 DOI: 10.1128/aem.00154-18] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 02/19/2018] [Indexed: 02/05/2023] Open
Abstract
Among bacteria, only a single styrene-specific degradation pathway has been reported so far. It comprises the activity of styrene monooxygenase, styrene oxide isomerase, and phenylacetaldehyde dehydrogenase, yielding phenylacetic acid as the central metabolite. The alternative route comprises ring-hydroxylating enzymes and yields vinyl catechol as central metabolite, which undergoes meta-cleavage. This was reported to be unspecific and also allows the degradation of benzene derivatives. However, some bacteria had been described to degrade styrene but do not employ one of those routes or only parts of them. Here, we describe a novel "hybrid" degradation pathway for styrene located on a plasmid of foreign origin. As putatively also unspecific, it allows metabolizing chemically analogous compounds (e.g., halogenated and/or alkylated styrene derivatives). Gordonia rubripertincta CWB2 was isolated with styrene as the sole source of carbon and energy. It employs an assembled route of the styrene side-chain degradation and isoprene degradation pathways that also funnels into phenylacetic acid as the central metabolite. Metabolites, enzyme activity, genome, transcriptome, and proteome data reinforce this observation and allow us to understand this biotechnologically relevant pathway, which can be used for the production of ibuprofen.IMPORTANCE The degradation of xenobiotics by bacteria is not only important for bioremediation but also because the involved enzymes are potential catalysts in biotechnological applications. This study reveals a novel degradation pathway for the hazardous organic compound styrene in Gordonia rubripertincta CWB2. This study provides an impressive illustration of horizontal gene transfer, which enables novel metabolic capabilities. This study presents glutathione-dependent styrene metabolization in an (actino-)bacterium. Further, the genomic background of the ability of strain CWB2 to produce ibuprofen is demonstrated.
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Affiliation(s)
- Thomas Heine
- Institute of Biosciences, TU Bergakademie Freiberg, Freiberg, Germany
| | | | - Anne Ballmann
- Institute of Biosciences, TU Bergakademie Freiberg, Freiberg, Germany
| | | | - Christian Rückert
- Technologieplattform Genomik, Centrum für Biotechnologie (CeBiTec), Universität Bielefeld, Bielefeld, Germany
| | - Tobias Busche
- Technologieplattform Genomik, Centrum für Biotechnologie (CeBiTec), Universität Bielefeld, Bielefeld, Germany
| | - Anika Winkler
- Technologieplattform Genomik, Centrum für Biotechnologie (CeBiTec), Universität Bielefeld, Bielefeld, Germany
| | - Jörn Kalinowski
- Technologieplattform Genomik, Centrum für Biotechnologie (CeBiTec), Universität Bielefeld, Bielefeld, Germany
| | - Ansgar Poetsch
- Plant Biochemistry, Ruhr University Bochum, Bochum, Germany
- School of Biomedical and Healthcare Sciences, Plymouth University, Plymouth, United Kingdom
| | - Anika Scholtissek
- Institute of Biosciences, TU Bergakademie Freiberg, Freiberg, Germany
| | | | - Gert Schmidt
- Institut für Keramik, Glas- und Baustofftechnik, TU Bergakademie Freiberg, Freiberg, Germany
| | - Dirk Tischler
- Institute of Biosciences, TU Bergakademie Freiberg, Freiberg, Germany
- Microbial Biotechnology, Ruhr University Bochum, Bochum, Germany
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40
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Callegari S, Dennerlein S. Sensing the Stress: A Role for the UPR mt and UPR am in the Quality Control of Mitochondria. Front Cell Dev Biol 2018; 6:31. [PMID: 29644217 PMCID: PMC5882792 DOI: 10.3389/fcell.2018.00031] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 03/12/2018] [Indexed: 01/01/2023] Open
Abstract
Mitochondria exist as compartmentalized units, surrounded by a selectively permeable double membrane. Within is contained the mitochondrial genome and protein synthesis machinery, required for the synthesis of OXPHOS components and ultimately, ATP production. Despite their physical barrier, mitochondria are tightly integrated into the cellular environment. A constant flow of information must be maintained to and from the mitochondria and the nucleus, to ensure mitochondria are amenable to cell metabolic requirements and also to feedback on their functional state. This review highlights the pathways by which mitochondrial stress is signaled to the nucleus, with a particular focus on the mitochondrial unfolded protein response (UPRmt) and the unfolded protein response activated by the mistargeting of proteins (UPRam). Although these pathways were originally discovered to alleviate proteotoxic stress from the accumulation of mitochondrial-targeted proteins that are misfolded or unimported, we review recent findings indicating that the UPRmt can also sense defects in mitochondrial translation. We further discuss the regulation of OXPHOS assembly and speculate on a possible role for mitochondrial stress pathways in sensing OXPHOS biogenesis.
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Affiliation(s)
- Sylvie Callegari
- Department of Cellular Biochemistry, University Medical Center Göttingen, Göttingen, Germany
| | - Sven Dennerlein
- Department of Cellular Biochemistry, University Medical Center Göttingen, Göttingen, Germany
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41
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Castro JP, Wardelmann K, Grune T, Kleinridders A. Mitochondrial Chaperones in the Brain: Safeguarding Brain Health and Metabolism? Front Endocrinol (Lausanne) 2018; 9:196. [PMID: 29755410 PMCID: PMC5932182 DOI: 10.3389/fendo.2018.00196] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Accepted: 04/10/2018] [Indexed: 12/31/2022] Open
Abstract
The brain orchestrates organ function and regulates whole body metabolism by the concerted action of neurons and glia cells in the central nervous system. To do so, the brain has tremendously high energy consumption and relies mainly on glucose utilization and mitochondrial function in order to exert its function. As a consequence of high rate metabolism, mitochondria in the brain accumulate errors over time, such as mitochondrial DNA (mtDNA) mutations, reactive oxygen species, and misfolded and aggregated proteins. Thus, mitochondria need to employ specific mechanisms to avoid or ameliorate the rise of damaged proteins that contribute to aberrant mitochondrial function and oxidative stress. To maintain mitochondria homeostasis (mitostasis), cells evolved molecular chaperones that shuttle, refold, or in coordination with proteolytic systems, help to maintain a low steady-state level of misfolded/aggregated proteins. Their importance is exemplified by the occurrence of various brain diseases which exhibit reduced action of chaperones. Chaperone loss (expression and/or function) has been observed during aging, metabolic diseases such as type 2 diabetes and in neurodegenerative diseases such as Alzheimer's (AD), Parkinson's (PD) or even Huntington's (HD) diseases, where the accumulation of damage proteins is evidenced. Within this perspective, we propose that proper brain function is maintained by the joint action of mitochondrial chaperones to ensure and maintain mitostasis contributing to brain health, and that upon failure, alter brain function which can cause metabolic diseases.
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Affiliation(s)
- José Pedro Castro
- Department of Molecular Toxicology, German Institute of Human Nutrition (DIfE), Potsdam-Rehbruecke, Germany
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany
- *Correspondence: José Pedro Castro, ; André Kleinridders,
| | - Kristina Wardelmann
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany
- Central Regulation of Metabolism, German Institute of Human Nutrition (DIfE), Potsdam-Rehbruecke, Germany
| | - Tilman Grune
- Department of Molecular Toxicology, German Institute of Human Nutrition (DIfE), Potsdam-Rehbruecke, Germany
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany
- German Center for Cardiovascular Research (DZHK), Berlin, Germany
- Institute of Nutritional Science, University of Potsdam, Nuthetal, Germany
| | - André Kleinridders
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany
- Central Regulation of Metabolism, German Institute of Human Nutrition (DIfE), Potsdam-Rehbruecke, Germany
- *Correspondence: José Pedro Castro, ; André Kleinridders,
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42
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Ianni A, Hoelper S, Krueger M, Braun T, Bober E. Sirt7 stabilizes rDNA heterochromatin through recruitment of DNMT1 and Sirt1. Biochem Biophys Res Commun 2017; 492:434-440. [PMID: 28842251 DOI: 10.1016/j.bbrc.2017.08.081] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Accepted: 08/21/2017] [Indexed: 12/24/2022]
Abstract
Maintenance of highly compact heterochromatin at ribosomal DNA (rDNA) segments is essential to prevent homologous recombination between rDNA repeats and for preserving genomic stability and nucleolar architecture. Here, we investigated the role of Sirtuin 7 (Sirt7) in the regulation of rDNA chromatin structure, rDNA repeat stability and nucleolar organization. We found that Sirt7 mediates heterochromatin formation at rRNA genes through recruitment of DNA methyltransferase 1 and another member of the sirtuin family, Sirt1. Lack of Sirt7 leads to nucleolar fragmentation associated with hypomethylation of rDNA and hyperacetylation of histones at rDNA loci resulting in rDNA and genomic instability. Our findings suggest a novel role of Sirt7 in preventing cellular transformation by mediating maintenance of rDNA repeats and nucleolar integrity.
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Affiliation(s)
- Alessandro Ianni
- Max-Planck-Institute for Heart and Lung Research, Department of Cardiac Development and Remodeling, Ludwigstrasse 43, 61231 Bad Nauheim, Germany
| | - Soraya Hoelper
- Max-Planck-Institute for Heart and Lung Research, Department of Cardiac Development and Remodeling, Ludwigstrasse 43, 61231 Bad Nauheim, Germany
| | - Marcus Krueger
- Max-Planck-Institute for Heart and Lung Research, Department of Cardiac Development and Remodeling, Ludwigstrasse 43, 61231 Bad Nauheim, Germany
| | - Thomas Braun
- Max-Planck-Institute for Heart and Lung Research, Department of Cardiac Development and Remodeling, Ludwigstrasse 43, 61231 Bad Nauheim, Germany.
| | - Eva Bober
- Max-Planck-Institute for Heart and Lung Research, Department of Cardiac Development and Remodeling, Ludwigstrasse 43, 61231 Bad Nauheim, Germany.
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43
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Drosophila protease ClpXP specifically degrades DmLRPPRC1 controlling mitochondrial mRNA and translation. Sci Rep 2017; 7:8315. [PMID: 28814717 PMCID: PMC5559520 DOI: 10.1038/s41598-017-08088-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 07/06/2017] [Indexed: 12/21/2022] Open
Abstract
ClpXP is the major protease in the mitochondrial matrix in eukaryotes, and is well conserved among species. ClpXP is composed of a proteolytic subunit, ClpP, and a chaperone-like subunit, ClpX. Although it has been proposed that ClpXP is required for the mitochondrial unfolded protein response, additional roles for ClpXP in mitochondrial biogenesis are unclear. Here, we found that Drosophila leucine-rich pentatricopeptide repeat domain-containing protein 1 (DmLRPPRC1) is a specific substrate of ClpXP. Depletion or introduction of catalytically inactive mutation of ClpP increases DmLRPPRC1 and causes non-uniform increases of mitochondrial mRNAs, accumulation of some unprocessed mitochondrial transcripts, and modest repression of mitochondrial translation in Drosophila Schneider S2 cells. Moreover, DmLRPPRC1 over-expression induces the phenotypes similar to those observed when ClpP is depleted. Taken together, ClpXP regulates mitochondrial gene expression by changing the protein level of DmLRPPRC1 in Drosophila Schneider S2 cells.
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44
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Lee DM, Kim IY, Seo MJ, Kwon MR, Choi KS. Nutlin-3 enhances the bortezomib sensitivity of p53-defective cancer cells by inducing paraptosis. Exp Mol Med 2017; 49:e365. [PMID: 28798402 PMCID: PMC5579507 DOI: 10.1038/emm.2017.112] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Revised: 01/13/2017] [Accepted: 03/05/2017] [Indexed: 01/01/2023] Open
Abstract
The proteasome inhibitor, bortezomib, is ineffective against many solid tumors. Nutlin-3 is a potent antagonist of human homolog of murine double minute 2/p53 interaction exhibiting promising therapeutic anti-cancer activity. In this study, we show that treatment of various p53-defective bortezomib-resistant solid tumor cells with bortezomib plus nutlin-3 induces paraptosis, which is a cell death mode accompanied by dilation of the endoplasmic reticulum (ER) and mitochondria. Bortezomib alone did not markedly alter cellular morphology, and nutlin-3 alone induced only a transient mitochondrial dilation. However, bortezomib/nutlin-3 co-treatment triggered the progressive fusion of swollen ER and the formation of megamitochondria, leading to cell death. Mechanistically, proteasomal-impairment-induced ER stress, CHOP upregulation and disruption of Ca2+ homeostasis were found to be critically involved in the bortezomib/nutlin-3-induced dilation of the ER. Our results further suggest that mitochondrial unfolded protein stress may play an important role in the mitochondrial dilation observed during bortezomib/nutlin-3-induced cell death. Collectively, these findings suggest that bortezomib/nutlin-3 perturbs proteostasis, triggering ER/mitochondria stress and irrecoverable impairments in their structure and function, ultimately leading to paraptotic cell death.
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Affiliation(s)
- Dong Min Lee
- Department of Biochemistry, Ajou University School of Medicine, Suwon, Korea.,BK21 Plus Program, Department of Biomedical Sciences, Ajou University School of Medicine, Suwon, Korea
| | - In Young Kim
- Department of Biochemistry, Ajou University School of Medicine, Suwon, Korea.,BK21 Plus Program, Department of Biomedical Sciences, Ajou University School of Medicine, Suwon, Korea
| | - Min Ji Seo
- Department of Biochemistry, Ajou University School of Medicine, Suwon, Korea.,BK21 Plus Program, Department of Biomedical Sciences, Ajou University School of Medicine, Suwon, Korea
| | - Mi Ri Kwon
- Department of Biochemistry, Ajou University School of Medicine, Suwon, Korea.,BK21 Plus Program, Department of Biomedical Sciences, Ajou University School of Medicine, Suwon, Korea
| | - Kyeong Sook Choi
- Department of Biochemistry, Ajou University School of Medicine, Suwon, Korea.,BK21 Plus Program, Department of Biomedical Sciences, Ajou University School of Medicine, Suwon, Korea
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45
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Knuppertz L, Osiewacz HD. Autophagy compensates impaired energy metabolism in CLPXP-deficient Podospora anserina strains and extends healthspan. Aging Cell 2017; 16:704-715. [PMID: 28449241 PMCID: PMC5506401 DOI: 10.1111/acel.12600] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/09/2017] [Indexed: 01/22/2023] Open
Abstract
The degradation of nonfunctional mitochondrial proteins is of fundamental relevance for maintenance of cellular homeostasis. The heteromeric CLPXP protein complex in the mitochondrial matrix is part of this process. In the fungal aging model Podospora anserina, ablation of CLPXP leads to an increase in healthy lifespan. Here, we report that this counterintuitive increase depends on a functional autophagy machinery. In PaClpXP mutants, autophagy is involved in energy conservation and the compensation of impairments in respiration. Strikingly, despite the impact on mitochondrial function, it is not mitophagy but general autophagy that is constitutively induced and required for longevity. In contrast, in another long‐lived mutant ablated for the mitochondrial PaIAP protease, autophagy is neither induced nor required for lifespan extension. Our data provide novel mechanistic insights into the capacity of different forms of autophagy to compensate impairments of specific components of the complex mitochondrial quality control network and about the biological role of mitochondrial CLPXP in the control of cellular energy metabolism.
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Affiliation(s)
- Laura Knuppertz
- Institute of Molecular Biosciences and Cluster of Excellence ‘Macromolecular Complexes’; Department of Biosciences; J. W. Goethe University; Frankfurt Germany
| | - Heinz D. Osiewacz
- Institute of Molecular Biosciences and Cluster of Excellence ‘Macromolecular Complexes’; Department of Biosciences; J. W. Goethe University; Frankfurt Germany
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Protein quality control at the mitochondrion. Essays Biochem 2017; 60:213-225. [PMID: 27744337 DOI: 10.1042/ebc20160009] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 05/31/2016] [Indexed: 12/17/2022]
Abstract
Mitochondria are essential constituents of a eukaryotic cell by supplying ATP and contributing to many mayor metabolic processes. As endosymbiotic organelles, they represent a cellular subcompartment exhibiting many autonomous functions, most importantly containing a complete endogenous machinery responsible for protein expression, folding and degradation. This article summarizes the biochemical processes and the enzymatic components that are responsible for maintaining mitochondrial protein homoeostasis. As mitochondria lack a large part of the required genetic information, most proteins are synthesized in the cytosol and imported into the organelle. After reaching their destination, polypeptides must fold and assemble into active proteins. Under pathological conditions, mitochondrial proteins become misfolded or damaged and need to be repaired with the help of molecular chaperones or eventually removed by specific proteases. Failure of these protein quality control mechanisms results in loss of mitochondrial function and structural integrity. Recently, novel mechanisms have been identified that support mitochondrial quality on the organellar level. A mitochondrial unfolded protein response allows the adaptation of chaperone and protease activities. Terminally damaged mitochondria may be removed by a variation of autophagy, termed mitophagy. An understanding of the role of protein quality control in mitochondria is highly relevant for many human pathologies, in particular neurodegenerative diseases.
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47
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Lindholm D, Korhonen L, Eriksson O, Kõks S. Recent Insights into the Role of Unfolded Protein Response in ER Stress in Health and Disease. Front Cell Dev Biol 2017; 5:48. [PMID: 28540288 PMCID: PMC5423914 DOI: 10.3389/fcell.2017.00048] [Citation(s) in RCA: 141] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Accepted: 04/13/2017] [Indexed: 12/20/2022] Open
Abstract
Unfolded stress response (UPR) is a conserved cellular pathway involved in protein quality control to maintain homeostasis under different conditions and disease states characterized by cell stress. Although three general schemes of and genes induced by UPR are rather well-established, open questions remain including the precise role of UPR in human diseases and the interactions between different sensor systems during cell stress signaling. Particularly, the issue how the normally adaptive and pro-survival UPR pathway turns into a deleterious process causing sustained endoplasmic reticulum (ER) stress and cell death requires more studies. UPR is also named a friend with multiple personalities that we need to understand better to fully recognize its role in normal physiology and in disease pathology. UPR interacts with other organelles including mitochondria, and with cell stress signals and degradation pathways such as autophagy and the ubiquitin proteasome system. Here we review current concepts and mechanisms of UPR as studied in different cells and model systems and highlight the relevance of UPR and related stress signals in various human diseases.
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Affiliation(s)
- Dan Lindholm
- Medicum, Department of Biochemistry and Developmental Biology, Faculty of Medicine, University of HelsinkiHelsinki, Finland.,Minerva Foundation Institute for Medical ResearchHelsinki, Finland
| | - Laura Korhonen
- Minerva Foundation Institute for Medical ResearchHelsinki, Finland.,Division of Child Psychiatry, Helsinki University Central HospitalHelsinki, Finland
| | - Ove Eriksson
- Medicum, Department of Biochemistry and Developmental Biology, Faculty of Medicine, University of HelsinkiHelsinki, Finland
| | - Sulev Kõks
- Department of Pathophysiology, University of TartuTartu, Estonia.,Department of Reproductive Biology, Estonian University of Life SciencesTartu, Estonia
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48
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Wasilewski M, Chojnacka K, Chacinska A. Protein trafficking at the crossroads to mitochondria. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2016; 1864:125-137. [PMID: 27810356 DOI: 10.1016/j.bbamcr.2016.10.019] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 10/25/2016] [Accepted: 10/27/2016] [Indexed: 12/14/2022]
Abstract
Mitochondria are central power stations in the cell, which additionally serve as metabolic hubs for a plethora of anabolic and catabolic processes. The sustained function of mitochondria requires the precisely controlled biogenesis and expression coordination of proteins that originate from the nuclear and mitochondrial genomes. Accuracy of targeting, transport and assembly of mitochondrial proteins is also needed to avoid deleterious effects on protein homeostasis in the cell. Checkpoints of mitochondrial protein transport can serve as signals that provide information about the functional status of the organelles. In this review, we summarize recent advances in our understanding of mitochondrial protein transport and discuss examples that involve communication with the nucleus and cytosol.
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Affiliation(s)
- Michal Wasilewski
- International Institute of Molecular and Cell Biology in Warsaw, Poland.
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49
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Seo JH, Rivadeneira DB, Caino MC, Chae YC, Speicher DW, Tang HY, Vaira V, Bosari S, Palleschi A, Rampini P, Kossenkov AV, Languino LR, Altieri DC. The Mitochondrial Unfoldase-Peptidase Complex ClpXP Controls Bioenergetics Stress and Metastasis. PLoS Biol 2016; 14:e1002507. [PMID: 27389535 PMCID: PMC4936714 DOI: 10.1371/journal.pbio.1002507] [Citation(s) in RCA: 109] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 06/10/2016] [Indexed: 12/21/2022] Open
Abstract
Mitochondria must buffer the risk of proteotoxic stress to preserve bioenergetics, but the role of these mechanisms in disease is poorly understood. Using a proteomics screen, we now show that the mitochondrial unfoldase-peptidase complex ClpXP associates with the oncoprotein survivin and the respiratory chain Complex II subunit succinate dehydrogenase B (SDHB) in mitochondria of tumor cells. Knockdown of ClpXP subunits ClpP or ClpX induces the accumulation of misfolded SDHB, impairing oxidative phosphorylation and ATP production while activating "stress" signals of 5' adenosine monophosphate-activated protein kinase (AMPK) phosphorylation and autophagy. Deregulated mitochondrial respiration induced by ClpXP targeting causes oxidative stress, which in turn reduces tumor cell proliferation, suppresses cell motility, and abolishes metastatic dissemination in vivo. ClpP is universally overexpressed in primary and metastatic human cancer, correlating with shortened patient survival. Therefore, tumors exploit ClpXP-directed proteostasis to maintain mitochondrial bioenergetics, buffer oxidative stress, and enable metastatic competence. This pathway may provide a "drugable" therapeutic target in cancer.
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Affiliation(s)
- Jae Ho Seo
- Prostate Cancer Discovery and Development Program, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
- Tumor Microenvironment and Metastasis Program, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
| | - Dayana B. Rivadeneira
- Prostate Cancer Discovery and Development Program, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
- Tumor Microenvironment and Metastasis Program, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
| | - M. Cecilia Caino
- Prostate Cancer Discovery and Development Program, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
- Tumor Microenvironment and Metastasis Program, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
| | - Young Chan Chae
- Prostate Cancer Discovery and Development Program, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
- Tumor Microenvironment and Metastasis Program, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
| | - David W. Speicher
- Prostate Cancer Discovery and Development Program, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
- Molecular and Cellular Oncogenesis Program, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
- Center for Systems and Computational Biology, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
| | - Hsin-Yao Tang
- Center for Systems and Computational Biology, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
| | - Valentina Vaira
- Division of Pathology, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - Silvano Bosari
- Division of Pathology, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - Alessandro Palleschi
- Division of Thoracic Surgery, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Paolo Rampini
- Division of Neurosurgery, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Andrew V. Kossenkov
- Center for Systems and Computational Biology, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
| | - Lucia R. Languino
- Prostate Cancer Discovery and Development Program, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
- Department of Cancer Biology and Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
| | - Dario C. Altieri
- Prostate Cancer Discovery and Development Program, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
- Tumor Microenvironment and Metastasis Program, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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50
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Memme JM, Oliveira AN, Hood DA. Chronology of UPR activation in skeletal muscle adaptations to chronic contractile activity. Am J Physiol Cell Physiol 2016; 310:C1024-36. [PMID: 27122157 DOI: 10.1152/ajpcell.00009.2016] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Accepted: 04/27/2016] [Indexed: 12/29/2022]
Abstract
The mitochondrial and endoplasmic reticulum unfolded protein responses (UPR(mt) and UPR(ER)) are important for cellular homeostasis during stimulus-induced increases in protein synthesis. Exercise triggers the synthesis of mitochondrial proteins, regulated in part by peroxisome proliferator activator receptor-γ coactivator 1α (PGC-1α). To investigate the role of the UPR in exercise-induced adaptations, we subjected rats to 3 h of chronic contractile activity (CCA) for 1, 2, 3, 5, or 7 days followed by 3 h of recovery. Mitochondrial biogenesis signaling, through PGC-1α mRNA, increased 14-fold after 1 day of CCA. This resulted in 10-32% increases in cytochrome c oxidase activity, indicative of mitochondrial content, between days 3 and 7, as well as increases in the autophagic degradation of p62 and microtubule-associated proteins 1A/1B light chain 3A (LC3)-II protein. Before these adaptations, the UPR(ER) transcripts activating transcription factor-4, spliced X-box-binding protein 1, and binding immunoglobulin protein were elevated (1.3- to 3.8-fold) at days 1-3, while CCAAT/enhancer-binding protein homologous protein (CHOP) and chaperones binding immunoglobulin protein and heat shock protein (HSP) 70 were elevated at mRNA and protein levels (1.5- to 3.9-fold) at days 1-7 of CCA. The mitochondrial chaperones 10-kDa chaperonin, HSP60, and 75-kDa mitochondrial HSP, the protease ATP-dependent Clp protease proteolytic subunit, and the regulatory protein sirtuin-3 of the UPR(mt) were concurrently induced 10-80% between days 1 and 7 To test the role of the UPR in CCA-induced remodeling, we treated animals with the endoplasmic reticulum stress suppressor tauroursodeoxycholic acid and subjected them to 2 or 7 days of CCA. Tauroursodeoxycholic acid attenuated CHOP and HSP70 protein induction; however, this failed to impact mitochondrial remodeling. Our data indicate that signaling to the UPR is rapidly activated following acute contractile activity, that this is attenuated with repeated bouts, and that the UPR is involved in chronic adaptations to CCA; however, this appears to be independent of CHOP signaling.
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Affiliation(s)
- Jonathan M Memme
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada
| | - Ashley N Oliveira
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada
| | - David A Hood
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada
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