401
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Wei H, Liu L, Chen Q. Selective removal of mitochondria via mitophagy: distinct pathways for different mitochondrial stresses. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1853:2784-90. [PMID: 25840011 DOI: 10.1016/j.bbamcr.2015.03.013] [Citation(s) in RCA: 203] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Revised: 03/17/2015] [Accepted: 03/25/2015] [Indexed: 11/29/2022]
Abstract
The efficient and selective elimination of damaged or excessive mitochondria in response to bioenergetic and environmental cues is critical for maintaining a healthy and appropriate population of mitochondria. Mitophagy is considered to be the central mechanism of mitochondrial quality and quantity control. Atg32, a mitophagy receptor in yeast, recruits mitochondria targeted for degradation into the isolation membrane via both direct and indirect interactions with Atg8. In mammals, different mitophagy effectors, including the mitophagy receptors NIX, BNIP3 and FUDNC1 and the PINK1/Parkin pathway, have been identified to participate in the selective clearance of mitochondria. One common feature of mitophagy receptors is that they harbor an LC3-interacting region (LIR) that interacts with LC3, thus promoting the sequestration of mitochondria into the isolation membrane. Additionally, both receptor- and Parkin/PINK1-mediated mitophagy have been found to be regulated by reversible phosphorylation. Here, we review the recent progress in the understanding of the molecular mechanisms involved in selective mitophagy at multiple levels. We also discuss different mitophagy receptors from an evolutionary perspective and highlight the specific functions of and possible cooperation between distinct mechanisms of mitophagy.
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Affiliation(s)
- Huifang Wei
- State Key Laboratory of Biomembrane and Membrane Biotechnology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lei Liu
- State Key Laboratory of Biomembrane and Membrane Biotechnology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Quan Chen
- State Key Laboratory of Biomembrane and Membrane Biotechnology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China; Tianjin Key Laboratory of Protein Science, College of Life Sciences, Nankai University, Tianjin 300071, China.
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402
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Abstract
Mitophagy is a selective form of macro-autophagy in which mitochondria are selectively targeted for degradation in autophagolysosomes. Mitophagy can have the beneficial effect of eliminating old and/or damaged mitochondria, thus maintaining the integrity of the mitochondrial pool. However, mitophagy is not only limited to the turnover of dysfunctional mitochondria but also promotes reduction of overall mitochondrial mass in response to certain stresses, such as hypoxia and nutrient starvation. This prevents generation of reactive oxygen species and conserves valuable nutrients (such as oxygen) from being consumed inefficiently, thereby promoting cellular survival under conditions of energetic stress. The failure to properly modulate mitochondrial turnover in response to oncogenic stresses has been implicated both positively and negatively in tumorigenesis, while the potential of targeting mitophagy specifically as opposed to autophagy in general as a therapeutic strategy remains to be explored. The challenges and opportunities that come with our heightened understanding of the role of mitophagy in cancer are reviewed here.
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Affiliation(s)
- Aparajita H Chourasia
- The Ben May Department for Cancer Research, The University of Chicago, 929 East 57th Street, Chicago, IL 60637 USA ; The Committee on Cancer Biology, The University of Chicago, 929 East 57th Street, Chicago, IL 60637 USA
| | - Michelle L Boland
- The Ben May Department for Cancer Research, The University of Chicago, 929 East 57th Street, Chicago, IL 60637 USA ; The Committee on Molecular Metabolism & Nutrition, 929 East 57th Street, Chicago, IL 60637 USA
| | - Kay F Macleod
- The Ben May Department for Cancer Research, The University of Chicago, 929 East 57th Street, Chicago, IL 60637 USA ; The Committee on Cancer Biology, The University of Chicago, 929 East 57th Street, Chicago, IL 60637 USA ; The Committee on Molecular Metabolism & Nutrition, 929 East 57th Street, Chicago, IL 60637 USA ; The Ben May Department for Cancer Research, The University of Chicago Comprehensive Cancer Center, The Gordon Center for Integrative Sciences, W338 929 East 57th Street, Chicago, IL 60637 USA
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403
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Mechanisms by which different functional states of mitochondria define yeast longevity. Int J Mol Sci 2015; 16:5528-54. [PMID: 25768339 PMCID: PMC4394491 DOI: 10.3390/ijms16035528] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 03/05/2015] [Accepted: 03/05/2015] [Indexed: 12/17/2022] Open
Abstract
Mitochondrial functionality is vital to organismal physiology. A body of evidence supports the notion that an age-related progressive decline in mitochondrial function is a hallmark of cellular and organismal aging in evolutionarily distant eukaryotes. Studies of the baker’s yeast Saccharomyces cerevisiae, a unicellular eukaryote, have led to discoveries of genes, signaling pathways and chemical compounds that modulate longevity-defining cellular processes in eukaryotic organisms across phyla. These studies have provided deep insights into mechanistic links that exist between different traits of mitochondrial functionality and cellular aging. The molecular mechanisms underlying the essential role of mitochondria as signaling organelles in yeast aging have begun to emerge. In this review, we discuss recent progress in understanding mechanisms by which different functional states of mitochondria define yeast longevity, outline the most important unanswered questions and suggest directions for future research.
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404
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Müller M, Lu K, Reichert AS. Mitophagy and mitochondrial dynamics in Saccharomyces cerevisiae. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1853:2766-74. [PMID: 25753536 DOI: 10.1016/j.bbamcr.2015.02.024] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Revised: 02/10/2015] [Accepted: 02/27/2015] [Indexed: 12/13/2022]
Abstract
Mitochondria fulfill central cellular functions including energy metabolism, iron-sulfur biogenesis, and regulation of apoptosis and calcium homeostasis. Accumulation of dysfunctional mitochondria is observed in ageing and many human diseases such as cancer and various neurodegenerative disorders. Appropriate quality control of mitochondria is important for cell survival in most eukaryotic cells. One important pathway in this respect is mitophagy, a selective form of autophagy which removes excess and dysfunctional mitochondria. In the past decades a series of essential factors for mitophagy have been identified and characterized. However, little is known about the molecular mechanisms regulating mitophagy. The role of mitochondrial dynamics in mitophagy is controversially discussed. Here we will review recent advances in this context promoting our understanding on the molecular regulation of mitophagy in Saccharomyces cerevisiae and on the role of mitochondrial dynamics in mitochondrial quality control.
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Affiliation(s)
- Matthias Müller
- Mitochondrial Biology, Buchmann Institute for Molecular Life Sciences, Goethe University Frankfurt am Main, Germany; Mitochondrial Biology, Medical School, Goethe University Frankfurt am Main, Germany
| | - Kaihui Lu
- Institute of Biochemistry and Molecular Biology I, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
| | - Andreas S Reichert
- Mitochondrial Biology, Buchmann Institute for Molecular Life Sciences, Goethe University Frankfurt am Main, Germany; Mitochondrial Biology, Medical School, Goethe University Frankfurt am Main, Germany; Institute of Biochemistry and Molecular Biology I, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany.
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405
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Ney PA. Mitochondrial autophagy: Origins, significance, and role of BNIP3 and NIX. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1853:2775-83. [PMID: 25753537 DOI: 10.1016/j.bbamcr.2015.02.022] [Citation(s) in RCA: 234] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2014] [Revised: 01/24/2015] [Accepted: 02/26/2015] [Indexed: 12/24/2022]
Abstract
Mitochondrial autophagy (mitophagy) is a core cellular activity. In this review, we consider mitophagy and related cellular processes and discuss their significance for human disease. Strong parallels exist between mitophagy and xenophagy employed in host defense. These mechanisms converge on receptors in the innate immune system in clinically relevant scenarios. Mitophagy is part of a cellular quality control mechanism, which is implicated in degenerative disease, especially neurodegenerative disease. Furthermore, mitophagy is an aspect of cellular remodeling, which is employed during development. BNIP3 and NIX are related multi-functional outer mitochondrial membrane proteins. BNIP3 regulates mitophagy during hypoxia, whereas NIX is required for mitophagy during development of the erythroid lineage. Recent advances in the field of BNIP3- and NIX-mediated mitophagy are discussed.
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Affiliation(s)
- Paul A Ney
- Department of Cell & Molecular Biology, Lindsley F. Kimball Research Institute, New York Blood Center, 310 East 67 Street, New York, NY 10065-6275, USA.
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406
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Panda PK, Mukhopadhyay S, Das DN, Sinha N, Naik PP, Bhutia SK. Mechanism of autophagic regulation in carcinogenesis and cancer therapeutics. Semin Cell Dev Biol 2015; 39:43-55. [PMID: 25724561 DOI: 10.1016/j.semcdb.2015.02.013] [Citation(s) in RCA: 107] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Revised: 02/12/2015] [Accepted: 02/19/2015] [Indexed: 12/15/2022]
Abstract
Autophagy in cancer is an intensely debated concept in the field of translational research. The dual nature of autophagy implies that it can potentially modulate the pro-survival and pro-death mechanisms in tumor initiation and progression. There is a prospective molecular relationship between defective autophagy and tumorigenesis that involves the accumulation of damaged mitochondria and protein aggregates, which leads to the production of reactive oxygen species (ROS) and ultimately causes DNA damage that can lead to genomic instability. Moreover, autophagy regulates necrosis and is followed by inflammation, which limits tumor metastasis. On the other hand, autophagy provides a survival advantage to detached, dormant metastatic cells through nutrient fueling by tumor-associated stromal cells. Manipulating autophagy for induction of cell death, inhibition of protective autophagy at tissue-and context-dependent for apoptosis modulation has therapeutic implications. This review presents a comprehensive overview of the present state of knowledge regarding autophagy as a new approach to treat cancer.
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Affiliation(s)
- Prashanta Kumar Panda
- Department of Life Science, National Institute of Technology Rourkela, Odisha, India
| | - Subhadip Mukhopadhyay
- Department of Life Science, National Institute of Technology Rourkela, Odisha, India
| | - Durgesh Nandini Das
- Department of Life Science, National Institute of Technology Rourkela, Odisha, India
| | - Niharika Sinha
- Department of Life Science, National Institute of Technology Rourkela, Odisha, India
| | - Prajna Paramita Naik
- Department of Life Science, National Institute of Technology Rourkela, Odisha, India
| | - Sujit K Bhutia
- Department of Life Science, National Institute of Technology Rourkela, Odisha, India.
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407
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Müller M, Kötter P, Behrendt C, Walter E, Scheckhuber CQ, Entian KD, Reichert AS. Synthetic quantitative array technology identifies the Ubp3-Bre5 deubiquitinase complex as a negative regulator of mitophagy. Cell Rep 2015; 10:1215-25. [PMID: 25704822 DOI: 10.1016/j.celrep.2015.01.044] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 12/16/2014] [Accepted: 01/16/2015] [Indexed: 12/18/2022] Open
Abstract
Mitophagy is crucial to ensuring mitochondrial quality control. However, the molecular mechanism and regulation of mitophagy are still not fully understood. Here, we developed a quantitative methodology termed synthetic quantitative array (SQA) technology, which allowed us to perform a genome-wide screen for modulators of rapamycin-induced mitophagy in S. cerevisiae. SQA technology can be easily employed for other enzyme-based reporter systems and widely applied in yeast research. We identified 86 positive and 10 negative regulators of mitophagy. Moreover, SQA-based analysis of non-selective autophagy revealed that 63 of these regulators are specific for mitophagy and 33 regulate autophagy in general. The Ubp3-Bre5 deubiquitination complex was found to inhibit mitophagy but, conversely, to promote other types of autophagy, including ribophagy. This complex translocates dynamically to mitochondria upon induction of mitophagy. These findings point to a role of ubiquitination in mitophagy in yeast and suggest a reciprocal regulation of distinct autophagy pathways.
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Affiliation(s)
- Matthias Müller
- Mitochondrial Biology, Buchmann Institute for Molecular Life Sciences and Zentrum für Molekulare Medizin, Goethe University, Max-von-Laue-Straße 15, 60438 Frankfurt am Main, Germany
| | - Peter Kötter
- Institut für Molekulare Biowissenschaften, Goethe University, Max-von-Laue-Straße 9, 60438 Frankfurt am Main, Germany
| | - Christina Behrendt
- Mitochondrial Biology, Buchmann Institute for Molecular Life Sciences and Zentrum für Molekulare Medizin, Goethe University, Max-von-Laue-Straße 15, 60438 Frankfurt am Main, Germany; Institute of Biochemistry and Molecular Biology I, Medical Faculty, Heinrich Heine University, Universitätsstraße 1, 40225 Düsseldorf, Germany
| | - Elena Walter
- Mitochondrial Biology, Buchmann Institute for Molecular Life Sciences and Zentrum für Molekulare Medizin, Goethe University, Max-von-Laue-Straße 15, 60438 Frankfurt am Main, Germany
| | - Christian Q Scheckhuber
- Mitochondrial Biology, Buchmann Institute for Molecular Life Sciences and Zentrum für Molekulare Medizin, Goethe University, Max-von-Laue-Straße 15, 60438 Frankfurt am Main, Germany
| | - Karl-Dieter Entian
- Institut für Molekulare Biowissenschaften, Goethe University, Max-von-Laue-Straße 9, 60438 Frankfurt am Main, Germany
| | - Andreas S Reichert
- Mitochondrial Biology, Buchmann Institute for Molecular Life Sciences and Zentrum für Molekulare Medizin, Goethe University, Max-von-Laue-Straße 15, 60438 Frankfurt am Main, Germany; Institute of Biochemistry and Molecular Biology I, Medical Faculty, Heinrich Heine University, Universitätsstraße 1, 40225 Düsseldorf, Germany.
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408
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Burnett SF, Farré JC, Nazarko TY, Subramani S. Peroxisomal Pex3 activates selective autophagy of peroxisomes via interaction with the pexophagy receptor Atg30. J Biol Chem 2015; 290:8623-31. [PMID: 25694426 DOI: 10.1074/jbc.m114.619338] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Pexophagy is a process that selectively degrades peroxisomes by autophagy. The Pichia pastoris pexophagy receptor Atg30 is recruited to peroxisomes under peroxisome proliferation conditions. During pexophagy, Atg30 undergoes phosphorylation, a prerequisite for its interactions with the autophagy scaffold protein Atg11 and the ubiquitin-like protein Atg8. Atg30 is subsequently shuttled to the vacuole along with the targeted peroxisome for degradation. Here, we defined the binding site for Atg30 on the peroxisomal membrane protein Pex3 and uncovered a role for Pex3 in the activation of Atg30 via phosphorylation and in the recruitment of Atg11 to the receptor protein complex. Pex3 is classically a docking protein for other proteins that affect peroxisome biogenesis, division, and segregation. We conclude that Pex3 has a role beyond simple docking of Atg30 and that its interaction with Atg30 regulates pexophagy in the yeast P. pastoris.
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Affiliation(s)
- Sarah F Burnett
- From the Section of Molecular Biology, Division of Biological Sciences, University of California, San Diego, La Jolla, California 92093-0322
| | - Jean-Claude Farré
- From the Section of Molecular Biology, Division of Biological Sciences, University of California, San Diego, La Jolla, California 92093-0322
| | - Taras Y Nazarko
- From the Section of Molecular Biology, Division of Biological Sciences, University of California, San Diego, La Jolla, California 92093-0322
| | - Suresh Subramani
- From the Section of Molecular Biology, Division of Biological Sciences, University of California, San Diego, La Jolla, California 92093-0322
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409
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Peng W, DU T, Zhang Z, DU F, Jin J, Gong A. Knockdown of autophagy-related gene LC3 enhances the sensitivity of HepG 2 cells to epirubicin. Exp Ther Med 2015; 9:1271-1276. [PMID: 25780421 PMCID: PMC4353791 DOI: 10.3892/etm.2015.2266] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Accepted: 01/14/2015] [Indexed: 12/22/2022] Open
Abstract
Hepatocellular carcinoma (HCC) is a major public health problem. Despite new chemotherapeutic treatments, drug resistance remains a major clinical obstacle to successful treatment in HCC patients. Therefore, novel therapeutic targets and new modalities of treatment are urgently required. In this study, tetracycline-inducible lentivirus-mediated RNA interference (RNAi) was employed to knock down microtubule-associated protein 1 light chain 3 (LC3) gene, which encodes a key protein in the induction of autophagy, to study the protective function of autophagy in liver cancer tolerant to epirubicin. The effect of combined treatment with lentiviral shLC3 and epirubicin on cell growth and chemosensitivity to epirubicin in the HCC cell line HepG2 were also investigated. The results demonstrated that lentivirus-mediated LC3 silencing significantly inhibited cell proliferation. In addition, combined treatment with lentiviral shLC3 and epirubicin significantly decreased the survival rate of HepG2 cells, compared with that following treatment with either agent alone. Overall, the results from this study suggest for the first time, to the best of our knowledge, that LC3 plays a key role in HCC tumorigenesis, and is a novel therapeutic target for HCC.
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Affiliation(s)
- Wanxin Peng
- School of Medical Sciences and Laboratory Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China
| | - Tong DU
- School of Medical Sciences and Laboratory Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China
| | - Zihao Zhang
- School of Medical Sciences and Laboratory Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China
| | - Fengyi DU
- School of Medical Sciences and Laboratory Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China
| | - Jie Jin
- School of Medical Sciences and Laboratory Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China
| | - Aihua Gong
- School of Medical Sciences and Laboratory Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China
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410
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Dany M, Ogretmen B. Ceramide induced mitophagy and tumor suppression. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1853:2834-45. [PMID: 25634657 DOI: 10.1016/j.bbamcr.2014.12.039] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Revised: 12/09/2014] [Accepted: 12/25/2014] [Indexed: 12/11/2022]
Abstract
Sphingolipids are bioactive lipid effectors, which are involved in the regulation of various cellular signaling pathways. Sphingolipids play essential roles in controlling cell inflammation, proliferation, death, migration, senescence, metastasis and autophagy. Alterations in sphingolipid metabolism have been also implicated in many human cancers. Macroautophagy (referred to here as autophagy) is a form of nonselective sequestering of cytosolic materials by double membrane structures, autophagosomes, which can be either protective or lethal for cells. Ceramide, a central molecule of sphingolipid metabolism is involved in the regulation of autophagy at various levels, including the induction of lethal mitophagy, a selective autophagy process to target and eliminate damaged mitochondria. In this review, we focused on recent studies with regard to the regulation of autophagy, in particular lethal mitophagy, by ceramide, and aimed at providing discussion points for various context-dependent roles and mechanisms of action of ceramide in controlling mitophagy.
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Affiliation(s)
- Mohammed Dany
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, USA; Hollings Cancer Center, Medical University of South Carolina, 86 Jonathan Lucas Street, Charleston, SC 29425, USA
| | - Besim Ogretmen
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, USA; Hollings Cancer Center, Medical University of South Carolina, 86 Jonathan Lucas Street, Charleston, SC 29425, USA.
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411
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Kanki T, Furukawa K, Yamashita SI. Mitophagy in yeast: Molecular mechanisms and physiological role. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1853:2756-65. [PMID: 25603537 DOI: 10.1016/j.bbamcr.2015.01.005] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 12/24/2014] [Accepted: 01/08/2015] [Indexed: 01/19/2023]
Abstract
Mitochondria autophagy (mitophagy) is a process that selectively degrades mitochondria via autophagy. Recently, there has been significant progress in the understanding of mitophagy in yeast. Atg32, a mitochondrial outer membrane receptor, is indispensable for mitophagy. Phosphorylation of Atg32 is an initial cue for selective mitochondrial degradation. Atg32 expression and phosphorylation regulate the induction and efficiency of mitophagy. In addition to Atg32-related processes, recent studies have revealed that mitochondrial fission and the mitochondria-endoplasmic reticulum (ER) contact site may play important roles in mitophagy. Mitochondrial fission is required to regulate mitochondrial size. Mitochondria-ER contact is mediated by the ER-mitochondria encounter structure and is important to supply lipids from the ER for autophagosome biogenesis for mitophagy. Mitophagy is physiologically important for regulating the number of mitochondria, diminishing mitochondrial production of reactive oxygen species, and extending chronological lifespan under caloric restriction. These findings suggest that mitophagy contributes to maintain mitochondrial homeostasis. However, whether mitophagy selectively degrades damaged or dysfunctional mitochondria in yeast is unknown.
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Affiliation(s)
- Tomotake Kanki
- Laboratory of Biosignaling, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata 951-8510, Japan.
| | - Kentaro Furukawa
- Laboratory of Biosignaling, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata 951-8510, Japan
| | - Shun-ichi Yamashita
- Laboratory of Biosignaling, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata 951-8510, Japan
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412
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Randow F, Youle RJ. Self and nonself: how autophagy targets mitochondria and bacteria. Cell Host Microbe 2015; 15:403-11. [PMID: 24721569 DOI: 10.1016/j.chom.2014.03.012] [Citation(s) in RCA: 226] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Autophagy is an evolutionarily conserved pathway that transports cytoplasmic components for degradation into lysosomes. Selective autophagy can capture physically large objects, including cell-invading pathogens and damaged or superfluous organelles. Selectivity is achieved by cargo receptors that detect substrate-associated "eat-me" signals. In this Review, we discuss basic principles of selective autophagy and compare the "eat-me" signals and cargo receptors that mediate autophagy of bacteria and bacteria-derived endosymbionts-i.e., mitochondria.
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Affiliation(s)
- Felix Randow
- MRC Laboratory of Molecular Biology, Division of Protein and Nucleic Acid Chemistry, Francis Crick Avenue, Cambridge CB2 0QH, UK; University of Cambridge, Department of Medicine, Addenbrooke's Hospital, Cambridge CB2 0QQ, UK.
| | - Richard J Youle
- Surgical Neurology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health Bethesda, MD 20892, USA.
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413
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The role of autophagic degradation in the heart. J Mol Cell Cardiol 2015; 78:73-9. [DOI: 10.1016/j.yjmcc.2014.09.029] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Revised: 09/26/2014] [Accepted: 09/29/2014] [Indexed: 12/12/2022]
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414
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415
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Delorme-Axford E, Guimaraes RS, Reggiori F, Klionsky DJ. The yeast Saccharomyces cerevisiae: an overview of methods to study autophagy progression. Methods 2014; 75:3-12. [PMID: 25526918 DOI: 10.1016/j.ymeth.2014.12.008] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Revised: 11/26/2014] [Accepted: 12/04/2014] [Indexed: 12/15/2022] Open
Abstract
Macroautophagy (hereafter autophagy) is a highly evolutionarily conserved process essential for sustaining cellular integrity, homeostasis, and survival. Most eukaryotic cells constitutively undergo autophagy at a low basal level. However, various stimuli, including starvation, organelle deterioration, stress, and pathogen infection, potently upregulate autophagy. The hallmark morphological feature of autophagy is the formation of the double-membrane vesicle known as the autophagosome. In yeast, flux through the pathway culminates in autophagosome-vacuole fusion, and the subsequent degradation of the resulting autophagic bodies and cargo by vacuolar hydrolases, followed by efflux of the breakdown products. Importantly, aberrant autophagy is associated with diverse human pathologies. Thus, there is a need for ongoing work in this area to further understand the cellular factors regulating this process. The field of autophagy research has grown exponentially in recent years, and although numerous model organisms are being used to investigate autophagy, the baker's yeast Saccharomyces cerevisiae remains highly relevant, as there are significant and unique benefits to working with this organism. In this review, we will focus on the current methods available to evaluate and monitor autophagy in S. cerevisiae, which in several cases have also been subsequently exploited in higher eukaryotes.
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Affiliation(s)
| | - Rodrigo Soares Guimaraes
- Department of Cell Biology, Center for Molecular Medicine, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands; Department of Cell Biology, University Medical Center Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Fulvio Reggiori
- Department of Cell Biology, Center for Molecular Medicine, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands; Department of Cell Biology, University Medical Center Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Daniel J Klionsky
- Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109, United States.
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416
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Baker MJ, Palmer CS, Stojanovski D. Mitochondrial protein quality control in health and disease. Br J Pharmacol 2014; 171:1870-89. [PMID: 24117041 DOI: 10.1111/bph.12430] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2013] [Revised: 08/28/2013] [Accepted: 09/01/2013] [Indexed: 12/13/2022] Open
Abstract
Progressive mitochondrial dysfunction is linked with the onset of many age-related pathologies and neurological disorders. Mitochondrial damage can come in many forms and be induced by a variety of cellular insults. To preserve organelle function during biogenesis or times of stress, multiple surveillance systems work to ensure the persistence of a functional mitochondrial network. This review provides an overview of these processes, which collectively contribute to the maintenance of a healthy mitochondrial population, which is critical for cell physiology and survival.
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Affiliation(s)
- Michael J Baker
- Department of Biochemistry and Molecular Biology and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Melbourne, VIC, Australia; ARC Centre of Excellence for Coherent X-ray Science, Melbourne, VIC, Australia
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417
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Abstract
During nitrogen starvation, a nonselective bulk degradation of cytosolic proteins and organelles including ribosomes, termed macro‐autophagy (hereafter termed autophagy), is induced. The precise mechanism of RNA degradation by this pathway has not been yet elucidated. In this issue of the The EMBO Journal, Huang et al characterize an autophagy‐dependent RNA catabolism in yeast and identify the enzymes responsible for the degradation process.
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Affiliation(s)
- Evelyn Welter
- Department of Biological Chemistry, The Weizmann Institute of Science, Rehovot, Israel
| | - Zvulun Elazar
- Department of Biological Chemistry, The Weizmann Institute of Science, Rehovot, Israel
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418
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Guimaraes RS, Delorme-Axford E, Klionsky DJ, Reggiori F. Assays for the biochemical and ultrastructural measurement of selective and nonselective types of autophagy in the yeast Saccharomyces cerevisiae. Methods 2014; 75:141-50. [PMID: 25484341 DOI: 10.1016/j.ymeth.2014.11.023] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Revised: 11/25/2014] [Accepted: 11/27/2014] [Indexed: 10/24/2022] Open
Abstract
Autophagy is a conserved intracellular catabolic pathway that degrades unnecessary or dysfunctional cellular components. Components destined for degradation are sequestered into double-membrane vesicles called autophagosomes, which subsequently fuse with the vacuole/lysosome delivering their cargo into the interior of this organelle for turnover. Autophagosomes are generated through the concerted action of the autophagy-related (Atg) proteins. The yeast Saccharomyces cerevisiae has been key in the identification of the corresponding genes and their characterization, and it remains one of the leading model systems for the investigation of the molecular mechanism and functions of autophagy. In particular, it is still pivotal for the study of selective types of autophagy. The objective of this review is to present detailed protocols of the methods available to monitor the progression of both nonselective and selective types of autophagy, and to discuss their advantages and disadvantages. The ultimate aim is to provide researchers with the information necessary to select the optimal approach to address their biological question.
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Affiliation(s)
- Rodrigo Soares Guimaraes
- Department of Cell Biology, Center for Molecular Medicine, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands; Department of Cell Biology, Center for Molecular Medicine, University Medical Center Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Elizabeth Delorme-Axford
- Life Sciences Institute, University of Michigan, 210 Washtenaw Avenue, Ann Arbor, MI 48109-2216, USA
| | - Daniel J Klionsky
- Life Sciences Institute, University of Michigan, 210 Washtenaw Avenue, Ann Arbor, MI 48109-2216, USA
| | - Fulvio Reggiori
- Department of Cell Biology, Center for Molecular Medicine, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands; Department of Cell Biology, Center for Molecular Medicine, University Medical Center Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands.
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419
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Huang H, Kawamata T, Horie T, Tsugawa H, Nakayama Y, Ohsumi Y, Fukusaki E. Bulk RNA degradation by nitrogen starvation-induced autophagy in yeast. EMBO J 2014; 34:154-68. [PMID: 25468960 DOI: 10.15252/embj.201489083] [Citation(s) in RCA: 103] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Autophagy is a catabolic process conserved among eukaryotes. Under nutrient starvation, a portion of the cytoplasm is non-selectively sequestered into autophagosomes. Consequently, ribosomes are delivered to the vacuole/lysosome for destruction, but the precise mechanism of autophagic RNA degradation and its physiological implications for cellular metabolism remain unknown. We characterized autophagy-dependent RNA catabolism using a combination of metabolome and molecular biological analyses in yeast. RNA delivered to the vacuole was processed by Rny1, a T2-type ribonuclease, generating 3'-NMPs that were immediately converted to nucleosides by the vacuolar non-specific phosphatase Pho8. In the cytoplasm, these nucleosides were broken down by the nucleosidases Pnp1 and Urh1. Most of the resultant bases were not re-assimilated, but excreted from the cell. Bulk non-selective autophagy causes drastic perturbation of metabolism, which must be minimized to maintain intracellular homeostasis.
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Affiliation(s)
- Hanghang Huang
- Department of Biotechnology, Osaka University, Suita Osaka, Japan
| | - Tomoko Kawamata
- Frontier Research Center, Tokyo Institute of Technology, Midori-ku Yokohama, Japan
| | - Tetsuro Horie
- Frontier Research Center, Tokyo Institute of Technology, Midori-ku Yokohama, Japan
| | - Hiroshi Tsugawa
- Department of Biotechnology, Osaka University, Suita Osaka, Japan
| | | | - Yoshinori Ohsumi
- Frontier Research Center, Tokyo Institute of Technology, Midori-ku Yokohama, Japan
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420
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Cenci S. Autophagy, a new determinant of plasma cell differentiation and antibody responses. Mol Immunol 2014; 62:289-95. [DOI: 10.1016/j.molimm.2014.02.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Revised: 02/07/2014] [Accepted: 02/07/2014] [Indexed: 01/25/2023]
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421
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Bozaykut P, Ozer NK, Karademir B. Regulation of protein turnover by heat shock proteins. Free Radic Biol Med 2014; 77:195-209. [PMID: 25236750 DOI: 10.1016/j.freeradbiomed.2014.08.012] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Revised: 08/11/2014] [Accepted: 08/11/2014] [Indexed: 12/19/2022]
Abstract
Protein turnover reflects the balance between synthesis and degradation of proteins, and it is a crucial process for the maintenance of the cellular protein pool. The folding of proteins, refolding of misfolded proteins, and also degradation of misfolded and damaged proteins are involved in the protein quality control (PQC) system. Correct protein folding and degradation are controlled by many different factors, one of the most important of which is the heat shock protein family. Heat shock proteins (HSPs) are in the class of molecular chaperones, which may prevent the inappropriate interaction of proteins and induce correct folding. On the other hand, these proteins play significant roles in the degradation pathways, including endoplasmic reticulum-associated degradation (ERAD), the ubiquitin-proteasome system, and autophagy. This review focuses on the emerging role of HSPs in the regulation of protein turnover; the effects of HSPs on the degradation machineries ERAD, autophagy, and proteasome; as well as the role of posttranslational modifications in the PQC system.
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Affiliation(s)
- Perinur Bozaykut
- Genetic and Metabolic Diseases Research and Investigation Center, Department of Biochemistry, Faculty of Medicine, Marmara University, 34854 Maltepe, Istanbul, Turkey
| | - Nesrin Kartal Ozer
- Genetic and Metabolic Diseases Research and Investigation Center, Department of Biochemistry, Faculty of Medicine, Marmara University, 34854 Maltepe, Istanbul, Turkey
| | - Betul Karademir
- Genetic and Metabolic Diseases Research and Investigation Center, Department of Biochemistry, Faculty of Medicine, Marmara University, 34854 Maltepe, Istanbul, Turkey.
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422
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Park S, Choi SG, Yoo SM, Son JH, Jung YK. Choline dehydrogenase interacts with SQSTM1/p62 to recruit LC3 and stimulate mitophagy. Autophagy 2014; 10:1906-20. [PMID: 25483962 DOI: 10.4161/auto.32177] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
CHDH (choline dehydrogenase) is an enzyme catalyzing the dehydrogenation of choline to betaine aldehyde in mitochondria. Apart from this well-known activity, we report here a pivotal role of CHDH in mitophagy. Knockdown of CHDH expression impairs CCCP-induced mitophagy and PARK2/parkin-mediated clearance of mitochondria in mammalian cells, including HeLa cells and SN4741 dopaminergic neuronal cells. Conversely, overexpression of CHDH accelerates PARK2-mediated mitophagy. CHDH is found on both the outer and inner membranes of mitochondria in resting cells. Interestingly, upon induction of mitophagy, CHDH accumulates on the outer membrane in a mitochondrial potential-dependent manner. We found that CHDH is not a substrate of PARK2 but interacts with SQSTM1 independently of PARK2 to recruit SQSTM1 into depolarized mitochondria. The FB1 domain of CHDH is exposed to the cytosol and is required for the interaction with SQSTM1, and overexpression of the FB1 domain only in cytosol reduces CCCP-induced mitochondrial degradation via competitive interaction with SQSTM1. In addition, CHDH, but not the CHDH FB1 deletion mutant, forms a ternary protein complex with SQSTM1 and MAP1LC3 (LC3), leading to loading of LC3 onto the damaged mitochondria via SQSTM1. Further, CHDH is crucial to the mitophagy induced by MPP+ in SN4741 cells. Overall, our results suggest that CHDH is required for PARK2-mediated mitophagy for the recruitment of SQSTM1 and LC3 onto the mitochondria for cargo recognition.
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Key Words
- ANT, adenine nucleotide translocator
- Baf, bafilomycin A1
- CCCP, carbonyl cyanide m-chlorophenylhydrazone
- CHX, cycloheximide
- FB1, FAD/NAD (P)-binding domain 1
- FB2, FAD/NAD (P)-binding domain 2
- IM, inner membrane
- IMS, inter-membrane space
- LC3
- MPP+, 1-methyl-4-phenylpyridinium
- MTS, mitochondrial targeting sequence
- Mat, matrix
- OM, outer membrane
- PARK2/parkin
- PB1, Phox and Bem 1 domain
- PD, Parkinson disease
- PK, proteinase K
- RD, FAD-linked reductase domain
- SQSTM1/p62
- choline dehydrogenase
- mitophagy
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Affiliation(s)
- Sungwoo Park
- a Global Research Laboratory; School of Biological Science/Bio-MAX Institute ; Seoul National University ; Seoul , Korea
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423
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424
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Dolman NJ, Chambers KM, Mandavilli B, Batchelor RH, Janes MS. Tools and techniques to measure mitophagy using fluorescence microscopy. Autophagy 2014; 9:1653-62. [DOI: 10.4161/auto.24001] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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425
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He Y, Deng YZ, Naqvi NI. Atg24-assisted mitophagy in the foot cells is necessary for proper asexual differentiation inMagnaporthe oryzae. Autophagy 2014; 9:1818-27. [DOI: 10.4161/auto.26057] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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426
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Tanaka C, Tan LJ, Mochida K, Kirisako H, Koizumi M, Asai E, Sakoh-Nakatogawa M, Ohsumi Y, Nakatogawa H. Hrr25 triggers selective autophagy-related pathways by phosphorylating receptor proteins. ACTA ACUST UNITED AC 2014; 207:91-105. [PMID: 25287303 PMCID: PMC4195827 DOI: 10.1083/jcb.201402128] [Citation(s) in RCA: 101] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The budding yeast kinase Hrr25 regulates two selective autophagy–related pathways by phosphorylating degradation target receptors and thereby promoting their interaction with Atg11 and the formation of autophagosomal membrane. In selective autophagy, degradation targets are specifically recognized, sequestered by the autophagosome, and transported into the lysosome or vacuole. Previous studies delineated the molecular basis by which the autophagy machinery recognizes those targets, but the regulation of this process is still poorly understood. In this paper, we find that the highly conserved multifunctional kinase Hrr25 regulates two distinct selective autophagy–related pathways in Saccharomyces cerevisiae. Hrr25 is responsible for the phosphorylation of two receptor proteins: Atg19, which recognizes the assembly of vacuolar enzymes in the cytoplasm-to-vacuole targeting pathway, and Atg36, which recognizes superfluous peroxisomes in pexophagy. Hrr25-mediated phosphorylation enhances the interactions of these receptors with the common adaptor Atg11, which recruits the core autophagy-related proteins that mediate the formation of the autophagosomal membrane. Thus, this study introduces regulation of selective autophagy as a new role of Hrr25 and, together with other recent studies, reveals that different selective autophagy–related pathways are regulated by a uniform mechanism: phosphoregulation of the receptor–adaptor interaction.
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Affiliation(s)
- Chikara Tanaka
- Frontier Research Center and Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
| | - Li-Jing Tan
- Frontier Research Center and Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
| | - Keisuke Mochida
- Frontier Research Center and Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
| | - Hiromi Kirisako
- Frontier Research Center and Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
| | - Michiko Koizumi
- Frontier Research Center and Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
| | - Eri Asai
- Frontier Research Center and Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
| | - Machiko Sakoh-Nakatogawa
- Frontier Research Center and Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
| | - Yoshinori Ohsumi
- Frontier Research Center and Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
| | - Hitoshi Nakatogawa
- Frontier Research Center and Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan Frontier Research Center and Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
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427
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Mochida K, Ohsumi Y, Nakatogawa H. Hrr25 phosphorylates the autophagic receptor Atg34 to promote vacuolar transport of α-mannosidase under nitrogen starvation conditions. FEBS Lett 2014; 588:3862-9. [PMID: 25281559 DOI: 10.1016/j.febslet.2014.09.032] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Revised: 09/17/2014] [Accepted: 09/17/2014] [Indexed: 01/08/2023]
Abstract
In Saccharomyces cerevisiae, under nitrogen-starvation conditions, the α-mannosidase Ams1 is recognized by the autophagic receptor Atg34 and transported into the vacuole, where it functions as an active enzyme. In this study, we identified Hrr25 as the kinase that phosphorylates Atg34 under these conditions. Hrr25-mediated phosphorylation does not affect the interaction of Atg34 with Ams1, but instead promotes Atg34 binding to the adaptor protein Atg11, which recruits the autophagy machinery to the Ams1-Atg34 complex, resulting in activation of the vacuolar transport of Ams1. Our findings reveal the regulatory mechanism of a biosynthetic pathway mediated by the autophagy machinery.
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Affiliation(s)
- Keisuke Mochida
- Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Japan
| | | | - Hitoshi Nakatogawa
- Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Japan; Frontier Research Center, Tokyo Institute of Technology, Japan.
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428
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Zemljic M, Pejkovic B, Krajnc I, Lipovsek S. Biological pathways involved in the development of inflammatory bowel disease. Wien Klin Wochenschr 2014; 126:626-33. [PMID: 25256178 DOI: 10.1007/s00508-014-0592-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Accepted: 08/09/2014] [Indexed: 02/07/2023]
Abstract
Apoptosis, autophagy and necrosis are three distinct functional types of the mammalian cell death network. All of them are characterized by a number of cell's morphological changes. The inappropriate induction of cell death is involved in the pathogenesis of a number of diseases.Pathogenesis of inflammatory bowel diseases (ulcerative colitis, Crohn's disease) includes an abnormal immunological response to disturbed intestinal microflora. One of the most important reason in pathogenesis of chronic inflammatory disease and subsequent multiple organ pathology is a barrier function of the gut, regulating cellular viability. Recent findings have begun to explain the mechanisms by which intestinal epithelial cells are able to survive in such an environment and how loss of normal regulatory processes may lead to inflammatory bowel disease (IBD).This review focuses on the regulation of biological pathways in development and homeostasis in IBD. Better understanding of the physiological functions of biological pathways and their influence on inflammation, immunity, and barrier function will simplify our expertice of homeostasis in the gastrointestinal tract and in upgrading diagnosis and treatment.
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Affiliation(s)
- Mateja Zemljic
- Institute of Anatomy, Histology and Embryology, Faculty of Medicine, University of Maribor, Ljubljanska 5, 2000, Maribor, Slovenia,
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429
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Okamoto K. Organellophagy: eliminating cellular building blocks via selective autophagy. ACTA ACUST UNITED AC 2014; 205:435-45. [PMID: 24862571 PMCID: PMC4033777 DOI: 10.1083/jcb.201402054] [Citation(s) in RCA: 173] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Maintenance of organellar quality and quantity is critical for cellular homeostasis and adaptation to variable environments. Emerging evidence demonstrates that this kind of control is achieved by selective elimination of organelles via autophagy, termed organellophagy. Organellophagy consists of three key steps: induction, cargo tagging, and sequestration, which involve signaling pathways, organellar landmark molecules, and core autophagy-related proteins, respectively. In addition, posttranslational modifications such as phosphorylation and ubiquitination play important roles in recruiting and tailoring the autophagy machinery to each organelle. The basic principles underlying organellophagy are conserved from yeast to mammals, highlighting its biological relevance in eukaryotic cells.
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Affiliation(s)
- Koji Okamoto
- Graduate School of Frontier Biosciences, Osaka University, Suita, Osaka 565-0871, Japan
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430
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Mishra P, Chan DC. Mitochondrial dynamics and inheritance during cell division, development and disease. Nat Rev Mol Cell Biol 2014; 15:634-46. [PMID: 25237825 DOI: 10.1038/nrm3877] [Citation(s) in RCA: 771] [Impact Index Per Article: 70.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
During cell division, it is critical to properly partition functional sets of organelles to each daughter cell. The partitioning of mitochondria shares some common features with that of other organelles, particularly in the use of interactions with cytoskeletal elements to facilitate delivery to the daughter cells. However, mitochondria have unique features - including their own genome and a maternal mode of germline transmission - that place additional demands on this process. Consequently, mechanisms have evolved to regulate mitochondrial segregation during cell division, oogenesis, fertilization and tissue development, as well as to ensure the integrity of these organelles and their DNA, including fusion-fission dynamics, organelle transport, mitophagy and genetic selection of functional genomes. Defects in these processes can lead to cell and tissue pathologies.
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Affiliation(s)
- Prashant Mishra
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, California 91125, USA
| | - David C Chan
- 1] Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, California 91125, USA. [2] Howard Hughes Medical Institute, California Institute of Technology, Pasadena, California 91125, USA
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431
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AMBRA1 is able to induce mitophagy via LC3 binding, regardless of PARKIN and p62/SQSTM1. Cell Death Differ 2014; 22:419-32. [PMID: 25215947 PMCID: PMC4326570 DOI: 10.1038/cdd.2014.139] [Citation(s) in RCA: 271] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Revised: 07/30/2014] [Accepted: 07/31/2014] [Indexed: 12/20/2022] Open
Abstract
Damaged mitochondria are eliminated by mitophagy, a selective form of autophagy whose dysfunction associates with neurodegenerative diseases. PINK1, PARKIN and p62/SQTMS1 have been shown to regulate mitophagy, leaving hitherto ill-defined the contribution by key players in 'general' autophagy. In basal conditions, a pool of AMBRA1 - an upstream autophagy regulator and a PARKIN interactor - is present at the mitochondria, where its pro-autophagic activity is inhibited by Bcl-2. Here we show that, upon mitophagy induction, AMBRA1 binds the autophagosome adapter LC3 through a LIR (LC3 interacting region) motif, this interaction being crucial for regulating both canonical PARKIN-dependent and -independent mitochondrial clearance. Moreover, forcing AMBRA1 localization to the outer mitochondrial membrane unleashes a massive PARKIN- and p62-independent but LC3-dependent mitophagy. These results highlight a novel role for AMBRA1 as a powerful mitophagy regulator, through both canonical or noncanonical pathways.
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432
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Wei X, Qi Y, Zhang X, Qiu Q, Gu X, Tao C, Huang D, Zhang Y. Cadmium induces mitophagy through ROS-mediated PINK1/Parkin pathway. Toxicol Mech Methods 2014; 24:504-11. [DOI: 10.3109/15376516.2014.943444] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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433
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Mandell MA, Jain A, Arko-Mensah J, Chauhan S, Kimura T, Dinkins C, Silvestri G, Münch J, Kirchhoff F, Simonsen A, Wei Y, Levine B, Johansen T, Deretic V. TRIM proteins regulate autophagy and can target autophagic substrates by direct recognition. Dev Cell 2014; 30:394-409. [PMID: 25127057 DOI: 10.1016/j.devcel.2014.06.013] [Citation(s) in RCA: 262] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Revised: 05/11/2014] [Accepted: 06/17/2014] [Indexed: 12/22/2022]
Abstract
Autophagy, a homeostatic process whereby eukaryotic cells target cytoplasmic cargo for degradation, plays a broad role in health and disease states. Here we screened the TRIM family for roles in autophagy and found that half of TRIMs modulated autophagy. In mechanistic studies, we show that TRIMs associate with autophagy factors and act as platforms assembling ULK1 and Beclin 1 in their activated states. Furthermore, TRIM5α acts as a selective autophagy receptor. Based on direct sequence-specific recognition, TRIM5α delivered its cognate cytosolic target, a viral capsid protein, for autophagic degradation. Thus, our study establishes that TRIMs can function both as regulators of autophagy and as autophagic cargo receptors, and reveals a basis for selective autophagy in mammalian cells.
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Affiliation(s)
- Michael A Mandell
- Department of Molecular Genetics and Microbiology, University of New Mexico Health Sciences Center, 915 Camino de Salud NE, Albuquerque, NM 87131, USA
| | - Ashish Jain
- Molecular Cancer Research Group, Institute of Medical Biology, University of Tromsø-The Arctic University of Norway, 9037 Tromsø, Norway
| | - John Arko-Mensah
- Department of Molecular Genetics and Microbiology, University of New Mexico Health Sciences Center, 915 Camino de Salud NE, Albuquerque, NM 87131, USA
| | - Santosh Chauhan
- Department of Molecular Genetics and Microbiology, University of New Mexico Health Sciences Center, 915 Camino de Salud NE, Albuquerque, NM 87131, USA
| | - Tomonori Kimura
- Department of Molecular Genetics and Microbiology, University of New Mexico Health Sciences Center, 915 Camino de Salud NE, Albuquerque, NM 87131, USA
| | - Christina Dinkins
- Department of Molecular Genetics and Microbiology, University of New Mexico Health Sciences Center, 915 Camino de Salud NE, Albuquerque, NM 87131, USA
| | - Guido Silvestri
- Yerkes National Primate Research Center, Emory University, 3014 Yerkes, 954 Gatewood Road NE, Atlanta, GA 30329, USA
| | - Jan Münch
- Institute of Molecular Virology, Ulm University Medical Center, Meyerhofstrasse 1, 89081 Ulm, Germany
| | - Frank Kirchhoff
- Institute of Molecular Virology, Ulm University Medical Center, Meyerhofstrasse 1, 89081 Ulm, Germany
| | - Anne Simonsen
- Department of Biochemistry, Institute of Basic Medical Sciences, University of Oslo, 0317 Oslo, Norway
| | - Yongjie Wei
- Center for Autophagy Research and Howard Hughes Medical Institute, UT Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA
| | - Beth Levine
- Center for Autophagy Research and Howard Hughes Medical Institute, UT Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA
| | - Terje Johansen
- Molecular Cancer Research Group, Institute of Medical Biology, University of Tromsø-The Arctic University of Norway, 9037 Tromsø, Norway
| | - Vojo Deretic
- Department of Molecular Genetics and Microbiology, University of New Mexico Health Sciences Center, 915 Camino de Salud NE, Albuquerque, NM 87131, USA.
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434
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Redmann M, Dodson M, Boyer-Guittaut M, Darley-Usmar V, Zhang J. Mitophagy mechanisms and role in human diseases. Int J Biochem Cell Biol 2014; 53:127-33. [PMID: 24842106 PMCID: PMC4111979 DOI: 10.1016/j.biocel.2014.05.010] [Citation(s) in RCA: 107] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2013] [Revised: 04/10/2014] [Accepted: 05/11/2014] [Indexed: 11/21/2022]
Abstract
Mitophagy is a process of mitochondrial turnover through lysosomal mediated autophagy activities. This review will highlight recent studies that have identified mediators of mitophagy in response to starvation, loss of mitochondrial membrane potential or perturbation of mitochondrial integrity. Furthermore, we will review evidence of mitophagy dysfunction in various human diseases and discuss the potential for therapeutic interventions that target mitophagy processes.
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Affiliation(s)
- Matthew Redmann
- Center for Free Radical Biology, University of Alabama at Birmingham, USA; Department of Pathology, University of Alabama at Birmingham, USA
| | - Matthew Dodson
- Center for Free Radical Biology, University of Alabama at Birmingham, USA; Department of Pathology, University of Alabama at Birmingham, USA
| | - Michaël Boyer-Guittaut
- Université de Franche-Comté, Laboratoire de Biochimie, EA3922, SFR IBCT FED4234, Sciences et Techniques, 16 route de Gray, 25030 Besançon Cedex, France
| | - Victor Darley-Usmar
- Center for Free Radical Biology, University of Alabama at Birmingham, USA; Department of Pathology, University of Alabama at Birmingham, USA
| | - Jianhua Zhang
- Center for Free Radical Biology, University of Alabama at Birmingham, USA; Department of Pathology, University of Alabama at Birmingham, USA; Department of Veterans Affairs, Birmingham VA Medical Center, AL 35294, USA.
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435
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Pfaffenwimmer T, Reiter W, Brach T, Nogellova V, Papinski D, Schuschnig M, Abert C, Ammerer G, Martens S, Kraft C. Hrr25 kinase promotes selective autophagy by phosphorylating the cargo receptor Atg19. EMBO Rep 2014; 15:862-70. [PMID: 24968893 PMCID: PMC4197043 DOI: 10.15252/embr.201438932] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 05/30/2014] [Accepted: 06/10/2014] [Indexed: 01/08/2023] Open
Abstract
Autophagy is the major pathway for the delivery of cytoplasmic material to the vacuole or lysosome. Selective autophagy is mediated by cargo receptors, which link the cargo to the scaffold protein Atg11 and to Atg8 family proteins on the forming autophagosomal membrane. We show that the essential kinase Hrr25 activates the cargo receptor Atg19 by phosphorylation, which is required to link cargo to the Atg11 scaffold, allowing selective autophagy to proceed. We also find that the Atg34 cargo receptor is regulated in a similar manner, suggesting a conserved mechanism.
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Affiliation(s)
| | - Wolfgang Reiter
- Max F. Perutz Laboratories, University of Vienna, Vienna, Austria
| | - Thorsten Brach
- Max F. Perutz Laboratories, University of Vienna, Vienna, Austria
| | | | - Daniel Papinski
- Max F. Perutz Laboratories, University of Vienna, Vienna, Austria
| | | | - Christine Abert
- Max F. Perutz Laboratories, University of Vienna, Vienna, Austria
| | - Gustav Ammerer
- Max F. Perutz Laboratories, University of Vienna, Vienna, Austria
| | - Sascha Martens
- Max F. Perutz Laboratories, University of Vienna, Vienna, Austria
| | - Claudine Kraft
- Max F. Perutz Laboratories, University of Vienna, Vienna, Austria
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436
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Abstract
Selective autophagy is a quality control pathway through which cellular components are sequestered into double-membrane vesicles and delivered to specific intracellular compartments. This process requires autophagy receptors that link cargo to growing autophagosomal membranes. Selective autophagy is also implicated in various membrane trafficking events. Here we discuss the current view on how cargo selection and transport are achieved during selective autophagy, and point out molecular mechanisms that are congruent between autophagy and vesicle trafficking pathways.
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437
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Wu H, Xue D, Chen G, Han Z, Huang L, Zhu C, Wang X, Jin H, Wang J, Zhu Y, Liu L, Chen Q. The BCL2L1 and PGAM5 axis defines hypoxia-induced receptor-mediated mitophagy. Autophagy 2014; 10:1712-25. [PMID: 25126723 DOI: 10.4161/auto.29568] [Citation(s) in RCA: 143] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Receptor-mediated mitophagy is one of the major mechanisms of mitochondrial quality control essential for cell survival. We previously have identified FUNDC1 as a mitophagy receptor for selectively removing damaged mitochondria in mammalian systems. A critical unanswered question is how receptor-mediated mitophagy is regulated in response to cellular and environmental cues. Here, we report the striking finding that BCL2L1/Bcl-xL, but not BCL2, suppresses mitophagy mediated by FUNDC1 through its BH3 domain. Mechanistically, we demonstrate that BCL2L1, but not BCL2, interacts with and inhibits PGAM5, a mitochondrially localized phosphatase, to prevent the dephosphorylation of FUNDC1 at serine 13 (Ser13), which activates hypoxia-induced mitophagy. Our results showed that the BCL2L1-PGAM5-FUNDC1 axis is critical for receptor-mediated mitophagy in response to hypoxia and that BCL2L1 possesses unique functions distinct from BCL2.
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Affiliation(s)
- Hao Wu
- State Key Laboratory of Biomembrane and Membrane Biotechnology; Institute of Zoology; Chinese Academy of Sciences; Beijing, China; University of Chinese Academy of Sciences; Beijing, China
| | - Danfeng Xue
- State Key Laboratory of Biomembrane and Membrane Biotechnology; Institute of Zoology; Chinese Academy of Sciences; Beijing, China; School of Life Science; Anhui University; Hefei, Anhui China
| | - Guo Chen
- Tianjin Key Laboratory of Protein Science; College of Life Sciences; Nankai University; Tianjin, China
| | - Zhe Han
- Tianjin Key Laboratory of Protein Science; College of Life Sciences; Nankai University; Tianjin, China
| | - Li Huang
- State Key Laboratory of Biomembrane and Membrane Biotechnology; Institute of Zoology; Chinese Academy of Sciences; Beijing, China; University of Chinese Academy of Sciences; Beijing, China
| | - Chongzhuo Zhu
- State Key Laboratory of Biomembrane and Membrane Biotechnology; Institute of Zoology; Chinese Academy of Sciences; Beijing, China; University of Chinese Academy of Sciences; Beijing, China
| | - Xiaohui Wang
- State Key Laboratory of Biomembrane and Membrane Biotechnology; Institute of Zoology; Chinese Academy of Sciences; Beijing, China
| | - Haijing Jin
- State Key Laboratory of Biomembrane and Membrane Biotechnology; Institute of Zoology; Chinese Academy of Sciences; Beijing, China
| | - Jun Wang
- State Key Laboratory of Biomembrane and Membrane Biotechnology; Institute of Zoology; Chinese Academy of Sciences; Beijing, China
| | - Yushan Zhu
- Tianjin Key Laboratory of Protein Science; College of Life Sciences; Nankai University; Tianjin, China
| | - Lei Liu
- State Key Laboratory of Biomembrane and Membrane Biotechnology; Institute of Zoology; Chinese Academy of Sciences; Beijing, China; University of Chinese Academy of Sciences; Beijing, China
| | - Quan Chen
- State Key Laboratory of Biomembrane and Membrane Biotechnology; Institute of Zoology; Chinese Academy of Sciences; Beijing, China; University of Chinese Academy of Sciences; Beijing, China; Tianjin Key Laboratory of Protein Science; College of Life Sciences; Nankai University; Tianjin, China
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438
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Involvement of mitochondrial dynamics in the segregation of mitochondrial matrix proteins during stationary phase mitophagy. Nat Commun 2014; 4:2789. [PMID: 24240771 PMCID: PMC3909740 DOI: 10.1038/ncomms3789] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Accepted: 10/17/2013] [Indexed: 12/17/2022] Open
Abstract
Mitophagy, the autophagic degradation of mitochondria, is an important housekeeping function in eukaryotic cells and defects in mitophagy correlate with ageing phenomena and with several neurodegenerative disorders. A central mechanistic question regarding mitophagy is whether mitochondria are consumed en masse, or whether an active process segregates defective molecules from functional ones within the mitochondrial network, thus allowing a more efficient culling mechanism. Here, we combine a proteomic study with a molecular genetic and cell biology approach to determine whether such a segregation process occurs in yeast mitochondria. We find that different mitochondrial matrix proteins undergo mitophagic degradation at distinctly different rates, supporting the active segregation hypothesis. These differential degradation rates depend on mitochondrial dynamics, suggesting a mechanism coupling weak physical segregation with mitochondrial dynamics to achieve a distillation-like effect. In agreement, the rates of mitophagic degradation strongly correlate with the degree of physical segregation of specific matrix proteins.
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439
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Mitochondrial function and mitochondrial DNA maintenance with advancing age. Biogerontology 2014; 15:417-38. [PMID: 25015781 DOI: 10.1007/s10522-014-9515-2] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2014] [Accepted: 07/01/2014] [Indexed: 12/24/2022]
Abstract
We review the impact of mitochondrial DNA (mtDNA) maintenance and mitochondrial function on the aging process. Mitochondrial function and mtDNA integrity are closely related. In order to create a protective barrier against reactive oxygen and nitrogen species (RONS) attacks and ensure mtDNA integrity, multiple cellular mtDNA copies are packaged together with various proteins in nucleoids. Regulation of antioxidant and RONS balance, DNA base excision repair, and selective degradation of damaged mtDNA copies preserves normal mtDNA quantities. Oxidative damage to mtDNA molecules does not substantially contribute to increased mtDNA mutation frequency; rather, mtDNA replication errors of DNA PolG are the main source of mtDNA mutations. Mitochondrial turnover is the major contributor to maintenance of mtDNA and functionally active mitochondria. Mitochondrial turnover involves mitochondrial biogenesis, mitochondrial dynamics, and selective autophagic removal of dysfunctional mitochondria (i.e., mitophagy). All of these processes exhibit decreased activity during aging and fall under greater nuclear genome control, possibly coincident with the emergence of nuclear genome instability. We suggest that the age-dependent accumulation of mutated mtDNA copies and dysfunctional mitochondria is associated primarily with decreased cellular autophagic and mitophagic activity.
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440
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Zhu H, Foretz M, Xie Z, Zhang M, Zhu Z, Xing J, Leclerc J, Gaudry M, Viollet B, Zou MH. PRKAA1/AMPKα1 is required for autophagy-dependent mitochondrial clearance during erythrocyte maturation. Autophagy 2014; 10:1522-34. [PMID: 24988326 DOI: 10.4161/auto.29197] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
AMP-activated protein kinase α1 knockout (prkaa1(-/-)) mice manifest splenomegaly and anemia. The underlying molecular mechanisms, however, remain to be established. In this study, we tested the hypothesis that defective autophagy-dependent mitochondrial clearance in prkaa1(-/-) mice exacerbates oxidative stress, thereby enhancing erythrocyte destruction. The levels of ULK1 phosphorylation, autophagical flux, mitochondrial contents, and reactive oxygen species (ROS) were examined in human erythroleukemia cell line, K562 cells, as well as prkaa1(-/-) mouse embryonic fibroblasts and erythrocytes. Deletion of Prkaa1 resulted in the inhibition of ULK1 phosphorylation at Ser555, prevented the formation of ULK1 and BECN1- PtdIns3K complexes, and reduced autophagy capacity. The suppression of autophagy was associated with enhanced damaged mitochondrial accumulation and ROS production. Compared with wild-type (WT) mice, prkaa1(-/-) mice exhibited a shortened erythrocyte life span, hemolytic destruction of erythrocytes, splenomegaly, and anemia, all of which were alleviated by the administration of either rapamycin to activate autophagy or Mito-tempol, a mitochondria-targeted antioxidant, to scavenge mitochondrial ROS. Furthermore, transplantation of WT bone marrow into prkaa1(-/-) mice restored mitochondrial removal, reduced intracellular ROS levels, and normalized hematologic parameters and spleen size. Conversely, transplantation of prkaa1 (-/-) bone marrow into WT mice recapitulated the prkaa1(-/-) mouse phenotypes. We conclude that PRKAA1-dependent autophagy-mediated clearance of damaged mitochondria is required for erythrocyte maturation and homeostasis.
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Affiliation(s)
- Huaiping Zhu
- Section of Molecular Medicine; Department of Medicine; University of Oklahoma Health Sciences Center; Oklahoma City, OK USA
| | - Marc Foretz
- Inserm; U1016; Institut Cochin; Paris, France; CNRS; UMR8104; Institut Cochin; Paris, France; Université Paris Descartes; Sorbonne Paris; Paris, France
| | - Zhonglin Xie
- Section of Molecular Medicine; Department of Medicine; University of Oklahoma Health Sciences Center; Oklahoma City, OK USA
| | - Miao Zhang
- Section of Molecular Medicine; Department of Medicine; University of Oklahoma Health Sciences Center; Oklahoma City, OK USA
| | - Zhiren Zhu
- Department of Biology; University of North Carolina at Chapel Hill; Chapel Hill, NC USA
| | - Junjie Xing
- Section of Molecular Medicine; Department of Medicine; University of Oklahoma Health Sciences Center; Oklahoma City, OK USA
| | - Jocelyne Leclerc
- Inserm; U1016; Institut Cochin; Paris, France; CNRS; UMR8104; Institut Cochin; Paris, France; Université Paris Descartes; Sorbonne Paris; Paris, France
| | - Murielle Gaudry
- Inserm; U1016; Institut Cochin; Paris, France; CNRS; UMR8104; Institut Cochin; Paris, France; Université Paris Descartes; Sorbonne Paris; Paris, France
| | - Benoit Viollet
- Inserm; U1016; Institut Cochin; Paris, France; CNRS; UMR8104; Institut Cochin; Paris, France; Université Paris Descartes; Sorbonne Paris; Paris, France
| | - Ming-Hui Zou
- Section of Molecular Medicine; Department of Medicine; University of Oklahoma Health Sciences Center; Oklahoma City, OK USA
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441
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Dynamic regulation of macroautophagy by distinctive ubiquitin-like proteins. Nat Struct Mol Biol 2014; 21:336-45. [PMID: 24699082 DOI: 10.1038/nsmb.2787] [Citation(s) in RCA: 219] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Accepted: 01/10/2014] [Indexed: 12/20/2022]
Abstract
Autophagy complements the ubiquitin-proteasome system in mediating protein turnover. Whereas the proteasome degrades individual proteins modified with ubiquitin chains, autophagy degrades many proteins and organelles en masse. Macromolecules destined for autophagic degradation are 'selected' through sequestration within a specialized double-membrane compartment termed the phagophore, the precursor to an autophagosome, and then are hydrolyzed in a lysosome- or vacuole-dependent manner. Notably, a pair of distinctive ubiquitin-like proteins (UBLs), Atg8 and Atg12, regulate degradation by autophagy in unique ways by controlling autophagosome biogenesis and recruitment of specific cargos during selective autophagy. Here we review structural mechanisms underlying the functions and conjugation of these UBLs that are specialized to provide interaction platforms linked to phagophore membranes.
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442
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Liu L, Sakakibara K, Chen Q, Okamoto K. Receptor-mediated mitophagy in yeast and mammalian systems. Cell Res 2014; 24:787-95. [PMID: 24903109 PMCID: PMC4085769 DOI: 10.1038/cr.2014.75] [Citation(s) in RCA: 321] [Impact Index Per Article: 29.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Mitophagy, or mitochondria autophagy, plays a critical role in selective removal of damaged or unwanted mitochondria. Several protein receptors, including Atg32 in yeast, NIX/BNIP3L, BNIP3 and FUNDC1 in mammalian systems, directly act in mitophagy. Atg32 interacts with Atg8 and Atg11 on the surface of mitochondria, promoting core Atg protein assembly for mitophagy. NIX/BNIP3L, BNIP3 and FUNDC1 also have a classic motif to directly bind LC3 (Atg8 homolog in mammals) for activation of mitophagy. Recent studies have shown that receptor-mediated mitophagy is regulated by reversible protein phosphorylation. Casein kinase 2 (CK2) phosphorylates Atg32 and activates mitophagy in yeast. In contrast, in mammalian cells Src kinase and CK2 phosphorylate FUNDC1 to prevent mitophagy. Notably, in response to hypoxia and FCCP treatment, the mitochondrial phosphatase PGAM5 dephosphorylates FUNDC1 to activate mitophagy. Here, we mainly focus on recent advances in our understanding of the molecular mechanisms underlying the activation of receptor-mediated mitophagy and the implications of this catabolic process in health and disease.
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Affiliation(s)
- Lei Liu
- State Key Laboratory of Biomembrane and Membrane Biotechnology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Kaori Sakakibara
- Laboratory of Mitochondrial Dynamics, Graduate School of Frontier Biosciences, Osaka University, Suita, Osaka 565-0871, Japan
| | - Quan Chen
- State Key Laboratory of Biomembrane and Membrane Biotechnology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Koji Okamoto
- Laboratory of Mitochondrial Dynamics, Graduate School of Frontier Biosciences, Osaka University, Suita, Osaka 565-0871, Japan
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443
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Rivalin R, Lepinoux-Chambaud C, Eyer J, Savagner F. The NFL-TBS.40-63 anti-glioblastoma peptide disrupts microtubule and mitochondrial networks in the T98G glioma cell line. PLoS One 2014; 9:e98473. [PMID: 24896268 PMCID: PMC4045719 DOI: 10.1371/journal.pone.0098473] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Accepted: 05/02/2014] [Indexed: 11/18/2022] Open
Abstract
Despite aggressive therapies, including combinations of surgery, radiotherapy and chemotherapy, glioblastoma remains a highly aggressive brain cancer with the worst prognosis of any central nervous system disease. We have previously identified a neurofilament-derived cell-penetrating peptide, NFL-TBS.40-63, that specifically enters by endocytosis in glioblastoma cells, where it induces microtubule destruction and inhibits cell proliferation. Here, we explore the impact of NFL-TBS.40-63 peptide on the mitochondrial network and its functions by using global cell respiration, quantitative PCR analysis of the main actors directing mitochondrial biogenesis, western blot analysis of the oxidative phosphorylation (OXPHOS) subunits and confocal microscopy. We show that the internalized peptide disturbs mitochondrial and microtubule networks, interferes with mitochondrial dynamics and induces a rapid depletion of global cell respiration. This effect may be related to reduced expression of the NRF-1 transcription factor and of specific miRNAs, which may impact mitochondrial biogenesis, in regard to default mitochondrial mobility.
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Affiliation(s)
- Romain Rivalin
- Université d'Angers, Angers, France
- Laboratoire Neurobiologie & Transgenese, LNBT, UPRES EA-3143, Université d'Angers, Bâtiment IBS-IRIS, Angers, France
| | - Claire Lepinoux-Chambaud
- Université d'Angers, Angers, France
- Laboratoire Neurobiologie & Transgenese, LNBT, UPRES EA-3143, Université d'Angers, Bâtiment IBS-IRIS, Angers, France
| | - Joël Eyer
- Université d'Angers, Angers, France
- Laboratoire Neurobiologie & Transgenese, LNBT, UPRES EA-3143, Université d'Angers, Bâtiment IBS-IRIS, Angers, France
| | - Frédérique Savagner
- Université d'Angers, Angers, France
- Laboratoire Neurobiologie & Transgenese, LNBT, UPRES EA-3143, Université d'Angers, Bâtiment IBS-IRIS, Angers, France
- CHU Angers, Laboratoire de Biochimie, Angers, France
- * E-mail:
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444
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Birgisdottir ÅB, Lamark T, Johansen T. The LIR motif - crucial for selective autophagy. J Cell Sci 2014; 126:3237-47. [PMID: 23908376 DOI: 10.1242/jcs.126128] [Citation(s) in RCA: 677] [Impact Index Per Article: 61.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
(Macro)autophagy is a fundamental degradation process for macromolecules and organelles of vital importance for cell and tissue homeostasis. Autophagy research has gained a strong momentum in recent years because of its relevance to cancer, neurodegenerative diseases, muscular dystrophy, lipid storage disorders, development, ageing and innate immunity. Autophagy has traditionally been thought of as a bulk degradation process that is mobilized upon nutritional starvation to replenish the cell with building blocks and keep up with the energy demand. This view has recently changed dramatically following an array of papers describing various forms of selective autophagy. A main driving force has been the discovery of specific autophagy receptors that sequester cargo into forming autophagosomes (phagophores). At the heart of this selectivity lies the LC3-interacting region (LIR) motif, which ensures the targeting of autophagy receptors to LC3 (or other ATG8 family proteins) anchored in the phagophore membrane. LIR-containing proteins include cargo receptors, members of the basal autophagy apparatus, proteins associated with vesicles and of their transport, Rab GTPase-activating proteins (GAPs) and specific signaling proteins that are degraded by selective autophagy. Here, we comment on these new insights and focus on the interactions of LIR-containing proteins with members of the ATG8 protein family.
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Affiliation(s)
- Åsa Birna Birgisdottir
- Molecular Cancer Research Group, Institute of Medical Biology, University of Tromsø, 9037 Tromsø, Norway
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445
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Aihara M, Jin X, Kurihara Y, Yoshida Y, Matsushima Y, Oku M, Hirota Y, Saigusa T, Aoki Y, Uchiumi T, Yamamoto T, Sakai Y, Kang D, Kanki T. Tor and the Sin3-Rpd3 complex regulate expression of the mitophagy receptor protein Atg32 in yeast. J Cell Sci 2014; 127:3184-96. [PMID: 24838945 DOI: 10.1242/jcs.153254] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
When mitophagy is induced in Saccharomyces cerevisiae, the mitochondrial outer membrane protein ScAtg32 interacts with the cytosolic adaptor protein ScAtg11. ScAtg11 then delivers the mitochondria to the pre-autophagosomal structure for autophagic degradation. Despite the importance of ScAtg32 for mitophagy, the expression and functional regulation of ScAtg32 are poorly understood. In this study, we identified and characterized the ScAtg32 homolog in Pichia pastoris (PpAtg32). Interestingly, we found that PpAtg32 was barely expressed before induction of mitophagy and was rapidly expressed after induction of mitophagy by starvation. Additionally, PpAtg32 was phosphorylated when mitophagy was induced. We found that PpAtg32 expression was suppressed by Tor and the downstream PpSin3-PpRpd3 complex. Inhibition of Tor by rapamycin induced PpAtg32 expression, but could neither phosphorylate PpAtg32 nor induce mitophagy. Based on these findings, we conclude that the Tor and PpSin3-PpRpd3 pathway regulates PpAtg32 expression, but not PpAtg32 phosphorylation.
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Affiliation(s)
- Masamune Aihara
- Department of Clinical Chemistry and Laboratory Medicine, Kyushu University Graduate School of Medical Sciences, Fukuoka 812-8582, Japan
| | - Xiulian Jin
- Laboratory of Biosignaling, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan
| | - Yusuke Kurihara
- Department of Clinical Chemistry and Laboratory Medicine, Kyushu University Graduate School of Medical Sciences, Fukuoka 812-8582, Japan Laboratory of Biosignaling, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan
| | - Yutaka Yoshida
- Department of Structural Pathology, Institute of Nephrology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Japan
| | - Yuichi Matsushima
- Department of Clinical Chemistry and Laboratory Medicine, Kyushu University Graduate School of Medical Sciences, Fukuoka 812-8582, Japan
| | - Masahide Oku
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Yuko Hirota
- Laboratory of Biosignaling, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan
| | - Tetsu Saigusa
- Laboratory of Biosignaling, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan
| | - Yoshimasa Aoki
- Department of Clinical Chemistry and Laboratory Medicine, Kyushu University Graduate School of Medical Sciences, Fukuoka 812-8582, Japan
| | - Takeshi Uchiumi
- Department of Clinical Chemistry and Laboratory Medicine, Kyushu University Graduate School of Medical Sciences, Fukuoka 812-8582, Japan
| | - Tadashi Yamamoto
- Department of Structural Pathology, Institute of Nephrology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Japan
| | - Yasuyoshi Sakai
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Dongchon Kang
- Department of Clinical Chemistry and Laboratory Medicine, Kyushu University Graduate School of Medical Sciences, Fukuoka 812-8582, Japan
| | - Tomotake Kanki
- Laboratory of Biosignaling, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan
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446
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Degradation of organelles or specific organelle components via selective autophagy in plant cells. Int J Mol Sci 2014; 15:7624-38. [PMID: 24802874 PMCID: PMC4057695 DOI: 10.3390/ijms15057624] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2014] [Revised: 03/31/2014] [Accepted: 04/16/2014] [Indexed: 12/13/2022] Open
Abstract
Macroautophagy (hereafter referred to as autophagy) is a cellular mechanism dedicated to the degradation and recycling of unnecessary cytosolic components by their removal to the lytic compartment of the cell (the vacuole in plants). Autophagy is generally induced by stresses causing energy deprivation and its operation occurs by special vesicles, termed autophagosomes. Autophagy also operates in a selective manner, recycling specific components, such as organelles, protein aggregates or even specific proteins, and selective autophagy is implicated in both cellular housekeeping and response to stresses. In plants, selective autophagy has recently been shown to degrade mitochondria, plastids and peroxisomes, or organelle components such as the endoplasmic-reticulum (ER) membrane and chloroplast-derived proteins such as Rubisco. This ability places selective-autophagy as a major factor in cellular steady-state maintenance, both under stress and favorable environmental conditions. Here we review the recent advances documented in plants for this cellular process and further discuss its impact on plant physiology.
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447
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Xia M, Gonzalez P, Li C, Meng G, Jiang A, Wang H, Gao Q, Debatin KM, Beltinger C, Wei J. Mitophagy enhances oncolytic measles virus replication by mitigating DDX58/RIG-I-like receptor signaling. J Virol 2014; 88:5152-64. [PMID: 24574393 PMCID: PMC3993837 DOI: 10.1128/jvi.03851-13] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2013] [Accepted: 02/16/2014] [Indexed: 02/06/2023] Open
Abstract
UNLABELLED The success of future clinical trials with oncolytic viruses depends on the identification and the control of mechanisms that modulate their therapeutic efficacy. In particular, little is known about the role of autophagy in infection by attenuated measles virus of the Edmonston strain (MV-Edm). We investigated the interaction between autophagy, innate immune response, and oncolytic activity of MV-Edm, since the antiviral immune response is a known factor limiting virotherapies. We report that MV-Edm exploits selective autophagy to mitigate the innate immune response mediated by DDX58/RIG-I like receptors (RLRs) in non-small cell lung cancer (NSCLC) cells. Both RNA interference (RNAi) and overexpression approaches demonstrate that autophagy enhances viral replication and inhibits the production of type I interferons regulated by RLRs. We show that MV-Edm unexpectedly triggers SQSTM1/p62-mediated mitophagy, resulting in decreased mitochondrion-tethered mitochondrial antiviral signaling protein (MAVS) and subsequently weakening the innate immune response. These results unveil a novel infectious strategy based on the usurpation of mitophagy leading to mitigation of the innate immune response. This finding provides a rationale to modulate autophagy in oncolytic virotherapy. IMPORTANCE In vitro studies, preclinical experiments in vivo, and clinical trials with humans all indicate that oncolytic viruses hold promise for cancer therapy. Measles virus of the Edmonston strain (MV-Edm), which is an attenuated virus derived from the common wild-type measles virus, is paradigmatic for therapeutic oncolytic viruses. MV-Edm replicates preferentially in and kills cancer cells. The efficiency of MV-Edm is limited by the immune response of the host against viruses. In our study, we revealed that MV-Edm usurps a homeostatic mechanism of intracellular degradation of mitochondria, coined mitophagy, to attenuate the innate immune response in cancer cells. This strategy might provide a replicative advantage for the virus against the development of antiviral immune responses by the host. These findings are important since they may not only indicate that inducers of autophagy could enhance the efficacy of oncolytic therapies but also provide clues for antiviral therapy by targeting SQSTM1/p62-mediated mitophagy.
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Affiliation(s)
- Mao Xia
- Jiangsu Key Laboratory of Molecular Medicine, Medical School and State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China
| | - Patrick Gonzalez
- Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, Ulm, Germany
- CNRS UPR4301 Centre de Biophysique Moléculaire, Orléans, France
| | - Chunyan Li
- Jiangsu Key Laboratory of Molecular Medicine, Medical School and State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China
| | - Gang Meng
- Jiangsu Key Laboratory of Molecular Medicine, Medical School and State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China
| | - Aiqin Jiang
- Jiangsu Key Laboratory of Molecular Medicine, Medical School and State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China
| | - Hongwei Wang
- Jiangsu Key Laboratory of Molecular Medicine, Medical School and State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China
| | - Qian Gao
- Jiangsu Key Laboratory of Molecular Medicine, Medical School and State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China
| | - Klaus-Michael Debatin
- Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, Ulm, Germany
| | - Christian Beltinger
- Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, Ulm, Germany
| | - Jiwu Wei
- Jiangsu Key Laboratory of Molecular Medicine, Medical School and State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China
- Nanjing University High-Tech Institute at Suzhou, Suzhou, China
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448
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Abstract
During the last decade it has become evident that autophagy is not simply a non-selective bulk degradation pathway for intracellular components. On the contrary, the discovery and characterization of autophagy receptors which target specific cargo for lysosomal degradation by interaction with ATG8 (autophagy-related protein 8)/LC3 (light-chain 3) has accelerated our understanding of selective autophagy. A number of autophagy receptors have been identified which specifically mediate the selective autophagosomal degradation of a variety of cargoes including protein aggregates, signalling complexes, midbody rings, mitochondria and bacterial pathogens. In the present chapter, we discuss these autophagy receptors, their binding to ATG8/LC3 proteins and how they act in ubiquitin-mediated selective autophagy of intracellular bacteria (xenophagy) and protein aggregates (aggrephagy).
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449
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A regulatory signaling loop comprising the PGAM5 phosphatase and CK2 controls receptor-mediated mitophagy. Mol Cell 2014; 54:362-77. [PMID: 24746696 DOI: 10.1016/j.molcel.2014.02.034] [Citation(s) in RCA: 447] [Impact Index Per Article: 40.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Revised: 12/13/2013] [Accepted: 02/14/2014] [Indexed: 11/21/2022]
Abstract
Mitochondrial autophagy, or mitophagy, is a major mechanism involved in mitochondrial quality control via selectively removing damaged or unwanted mitochondria. Interactions between LC3 and mitophagy receptors such as FUNDC1, which harbors an LC3-interacting region (LIR), are essential for this selective process. However, how mitochondrial stresses are sensed to activate receptor-mediated mitophagy remains poorly defined. Here, we identify that the mitochondrially localized PGAM5 phosphatase interacts with and dephosphorylates FUNDC1 at serine 13 (Ser-13) upon hypoxia or carbonylcyanide p-trifluoromethoxyphenylhydrazone (FCCP) treatment. Dephosphorylation of FUNDC1 catalyzed by PGAM5 enhances its interaction with LC3, which is abrogated following knockdown of PGAM5 or the introduction of a cell-permeable unphosphorylated peptide encompassing the Ser-13 and LIR of FUNDC1. We further observed that CK2 phosphorylates FUNDC1 to reverse the effect of PGAM5 in mitophagy activation. Our results reveal a mechanistic signaling pathway linking mitochondria-damaging signals to the dephosphorylation of FUNDC1 by PGAM5, which ultimately induces mitophagy.
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450
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Rogov V, Dötsch V, Johansen T, Kirkin V. Interactions between autophagy receptors and ubiquitin-like proteins form the molecular basis for selective autophagy. Mol Cell 2014; 53:167-78. [PMID: 24462201 DOI: 10.1016/j.molcel.2013.12.014] [Citation(s) in RCA: 796] [Impact Index Per Article: 72.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Selective autophagy ensures recognition and removal of various cytosolic cargoes. Hence, aggregated proteins, damaged organelles, or pathogens are enclosed into the double-membrane vesicle, the autophagosome, and delivered to the lysosome for degradation. This process is mediated by selective autophagy receptors, such as p62/SQSTM1. These proteins recognize autophagic cargo and, via binding to small ubiquitin-like modifiers (UBLs)--Atg8/LC3/GABARAPs and ATG5--mediate formation of selective autophagosomes. Recently, it was found that UBLs can directly engage the autophagosome nucleation machinery. Here, we review recent findings on selective autophagy and propose a model for selective autophagosome formation in close proximity to cargo.
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Affiliation(s)
- Vladimir Rogov
- Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, Marie Curie Strasse 9, 60439 Frankfurt am Main, Germany
| | - Volker Dötsch
- Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, Marie Curie Strasse 9, 60439 Frankfurt am Main, Germany
| | - Terje Johansen
- Molecular Cancer Research Group, Institute of Medical Biology, University of Tromsø, 9037 Tromsø, Norway
| | - Vladimir Kirkin
- Merck KGaA, Frankfurter Strasse 250, 64293 Darmstadt, Germany.
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