201
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Defective endoplasmic reticulum-mitochondria contacts and bioenergetics in SEPN1-related myopathy. Cell Death Differ 2020; 28:123-138. [PMID: 32661288 PMCID: PMC7853070 DOI: 10.1038/s41418-020-0587-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 06/11/2020] [Accepted: 06/25/2020] [Indexed: 01/19/2023] Open
Abstract
SEPN1-related myopathy (SEPN1-RM) is a muscle disorder due to mutations of the SEPN1 gene, which is characterized by muscle weakness and fatigue leading to scoliosis and life-threatening respiratory failure. Core lesions, focal areas of mitochondria depletion in skeletal muscle fibers, are the most common histopathological lesion. SEPN1-RM underlying mechanisms and the precise role of SEPN1 in muscle remained incompletely understood, hindering the development of biomarkers and therapies for this untreatable disease. To investigate the pathophysiological pathways in SEPN1-RM, we performed metabolic studies, calcium and ATP measurements, super-resolution and electron microscopy on in vivo and in vitro models of SEPN1 deficiency as well as muscle biopsies from SEPN1-RM patients. Mouse models of SEPN1 deficiency showed marked alterations in mitochondrial physiology and energy metabolism, suggesting that SEPN1 controls mitochondrial bioenergetics. Moreover, we found that SEPN1 was enriched at the mitochondria-associated membranes (MAM), and was needed for calcium transients between ER and mitochondria, as well as for the integrity of ER-mitochondria contacts. Consistently, loss of SEPN1 in patients was associated with alterations in body composition which correlated with the severity of muscle weakness, and with impaired ER-mitochondria contacts and low ATP levels. Our results indicate a role of SEPN1 as a novel MAM protein involved in mitochondrial bioenergetics. They also identify a systemic bioenergetic component in SEPN1-RM and establish mitochondria as a novel therapeutic target. This role of SEPN1 contributes to explain the fatigue and core lesions in skeletal muscle as well as the body composition abnormalities identified as part of the SEPN1-RM phenotype. Finally, these results point out to an unrecognized interplay between mitochondrial bioenergetics and ER homeostasis in skeletal muscle. They could therefore pave the way to the identification of biomarkers and therapeutic drugs for SEPN1-RM and for other disorders in which muscle ER-mitochondria cross-talk are impaired.
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202
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Agarwal S, Ganesh S. Perinuclear mitochondrial clustering, increased ROS levels, and HIF1 are required for the activation of HSF1 by heat stress. J Cell Sci 2020; 133:jcs245589. [PMID: 32503939 DOI: 10.1242/jcs.245589] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 05/19/2020] [Indexed: 08/31/2023] Open
Abstract
The heat shock response (HSR) is a conserved cellular defensive response against stresses such as temperature, oxidative stress and heavy metals. A significant group of players in the HSR is the set of molecular chaperones known as heat shock proteins (HSPs), which assist in the refolding of unfolded proteins and prevent the accumulation of damaged proteins. HSP genes are activated by the HSF1 transcription factor, a master regulator of the HSR pathway. A variety of stressors activate HSF1, but the key molecular players and the processes that directly contribute to HSF1 activation remain unclear. In this study, we show that heat shock induces perinuclear clustering of mitochondria in mammalian cells, and this clustering is essential for activation of the HSR. We also show that this perinuclear clustering of mitochondria results in increased levels of reactive oxygen species in the nucleus, leading to the activation of hypoxia-inducible factor-1α (HIF-1α). To conclude, we provide evidence to suggest that HIF-1α is one of the crucial regulators of HSF1 and that HIF-1α is essential for activation of the HSR during heat shock.
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Affiliation(s)
- Saloni Agarwal
- Department of Biological Sciences and Bioengineering, Indian Institute of Technology, Kanpur 208016, India
| | - Subramaniam Ganesh
- Department of Biological Sciences and Bioengineering, Indian Institute of Technology, Kanpur 208016, India
- The Mehta Family Centre for Engineering in Medicine, Indian Institute of Technology, Kanpur 208016, India
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203
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Magalhães Rebelo AP, Dal Bello F, Knedlik T, Kaar N, Volpin F, Shin SH, Giacomello M. Chemical Modulation of Mitochondria-Endoplasmic Reticulum Contact Sites. Cells 2020; 9:cells9071637. [PMID: 32646031 PMCID: PMC7408517 DOI: 10.3390/cells9071637] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 06/23/2020] [Accepted: 07/02/2020] [Indexed: 12/13/2022] Open
Abstract
Contact sites between mitochondria and endoplasmic reticulum (ER) are points in which the two organelles are in close proximity. Due to their structural and functional complexity, their exploitation as pharmacological targets has never been considered so far. Notwithstanding, the number of compounds described to target proteins residing at these interfaces either directly or indirectly is rising. Here we provide original insight into mitochondria–ER contact sites (MERCs), with a comprehensive overview of the current MERCs pharmacology. Importantly, we discuss the considerable potential of MERCs to become a druggable target for the development of novel therapeutic strategies.
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Affiliation(s)
- Ana Paula Magalhães Rebelo
- Department of Biology, University of Padua, Via U. Bassi 58/B, 35121 Padua, Italy; (A.P.M.R.); (F.D.B.); (T.K.); (N.K.); (F.V.); (S.H.S.)
| | - Federica Dal Bello
- Department of Biology, University of Padua, Via U. Bassi 58/B, 35121 Padua, Italy; (A.P.M.R.); (F.D.B.); (T.K.); (N.K.); (F.V.); (S.H.S.)
| | - Tomas Knedlik
- Department of Biology, University of Padua, Via U. Bassi 58/B, 35121 Padua, Italy; (A.P.M.R.); (F.D.B.); (T.K.); (N.K.); (F.V.); (S.H.S.)
| | - Natasha Kaar
- Department of Biology, University of Padua, Via U. Bassi 58/B, 35121 Padua, Italy; (A.P.M.R.); (F.D.B.); (T.K.); (N.K.); (F.V.); (S.H.S.)
| | - Fabio Volpin
- Department of Biology, University of Padua, Via U. Bassi 58/B, 35121 Padua, Italy; (A.P.M.R.); (F.D.B.); (T.K.); (N.K.); (F.V.); (S.H.S.)
| | - Sang Hun Shin
- Department of Biology, University of Padua, Via U. Bassi 58/B, 35121 Padua, Italy; (A.P.M.R.); (F.D.B.); (T.K.); (N.K.); (F.V.); (S.H.S.)
| | - Marta Giacomello
- Department of Biology, University of Padua, Via U. Bassi 58/B, 35121 Padua, Italy; (A.P.M.R.); (F.D.B.); (T.K.); (N.K.); (F.V.); (S.H.S.)
- Department of Biomedical Sciences, University of Padua, Via U. Bassi 58/B, 35121 Padua, Italy
- Correspondence: ; Tel.: +39-049-827-6300
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204
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Rossini M, Pizzo P, Filadi R. Better to keep in touch: investigating inter‐organelle cross‐talk. FEBS J 2020; 288:740-755. [DOI: 10.1111/febs.15451] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 05/28/2020] [Accepted: 06/11/2020] [Indexed: 12/14/2022]
Affiliation(s)
- Michela Rossini
- Department of Biomedical Sciences University of Padua Padua Italy
| | - Paola Pizzo
- Department of Biomedical Sciences University of Padua Padua Italy
- Neuroscience Institute National Research Council (CNR) Padua Italy
| | - Riccardo Filadi
- Department of Biomedical Sciences University of Padua Padua Italy
- Neuroscience Institute National Research Council (CNR) Padua Italy
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205
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Liu TW, Liu F, Kang J. Let-7b-5p is involved in the response of endoplasmic reticulum stress in acute pulmonary embolism through upregulating the expression of stress-associated endoplasmic reticulum protein 1. IUBMB Life 2020; 72:1725-1736. [PMID: 32534478 DOI: 10.1002/iub.2306] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 04/09/2020] [Accepted: 05/06/2020] [Indexed: 01/06/2023]
Abstract
The endogenous non-coding microRNA (miRNA) let-7b-5p is highly expressed in the blood of patients with acute pulmonary embolism (PE). However, the mechanism underlying the involvement of let-7b-5p in acute PE remains unclear. To address this, we investigated the role of let-7b-5p in acute PE in both in vitro and in vivo experimental models. The results showed that let-7b-5p upregulated the expression of stress-associated endoplasmic reticulum protein 1 (SERP1) at the post-transcriptional level. SERP1 activation leads to modulation of its chaperone protein SEC61B in the response of endoplasmic reticulum (ER) stress. Furthermore, our data show that the unfolded protein response was triggered and activation of unfolded proteins GRP78, PERK, RNF121, and CHOP occurred through the PERK-CHOP pathway, resulting in an inflammatory response and apoptosis of lung epithelial cells. These characteristics were promoted by the in vitro expression of a let-7b-5p mimic; conversely, transfection with a let-7b-5p inhibitor decreased the response of ER stress in acute PE. The results from this study thus provide evidence that let-7b-5p promotes protein processing during ER stress response by upregulating SERP1 expression, ultimately resulting in an inflammatory response and apoptosis of lung cells, cumulatively playing a critical role in the pathogenesis of acute PE.
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Affiliation(s)
- Ting-Wei Liu
- Department of Respiratory Medicine, First Affiliated Hospital of China Medical University, Shenyang, China
| | - Fan Liu
- Department of Respiratory Medicine, First Affiliated Hospital of China Medical University, Shenyang, China
| | - Jian Kang
- Department of Respiratory Medicine, First Affiliated Hospital of China Medical University, Shenyang, China
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206
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Kwak C, Shin S, Park JS, Jung M, Nhung TTM, Kang MG, Lee C, Kwon TH, Park SK, Mun JY, Kim JS, Rhee HW. Contact-ID, a tool for profiling organelle contact sites, reveals regulatory proteins of mitochondrial-associated membrane formation. Proc Natl Acad Sci U S A 2020; 117:12109-12120. [PMID: 32414919 PMCID: PMC7275737 DOI: 10.1073/pnas.1916584117] [Citation(s) in RCA: 122] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The mitochondria-associated membrane (MAM) has emerged as a cellular signaling hub regulating various cellular processes. However, its molecular components remain unclear owing to lack of reliable methods to purify the intact MAM proteome in a physiological context. Here, we introduce Contact-ID, a split-pair system of BioID with strong activity, for identification of the MAM proteome in live cells. Contact-ID specifically labeled proteins proximal to the contact sites of the endoplasmic reticulum (ER) and mitochondria, and thereby identified 115 MAM-specific proteins. The identified MAM proteins were largely annotated with the outer mitochondrial membrane (OMM) and ER membrane proteins with MAM-related functions: e.g., FKBP8, an OMM protein, facilitated MAM formation and local calcium transport at the MAM. Furthermore, the definitive identification of biotinylation sites revealed membrane topologies of 85 integral membrane proteins. Contact-ID revealed regulatory proteins for MAM formation and could be reliably utilized to profile the proteome at any organelle-membrane contact sites in live cells.
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Affiliation(s)
- Chulhwan Kwak
- Department of Chemistry, Seoul National University, 08826 Seoul, Korea
- Department of Chemistry, Ulsan National Institute of Science and Technology, 44919 Ulsan, Korea
| | - Sanghee Shin
- Center for RNA Research, Institute for Basic Science, Seoul 08826, Korea
- School of Biological Sciences, Seoul National University, 08826 Seoul, Korea
| | - Jong-Seok Park
- Department of Chemistry, Ulsan National Institute of Science and Technology, 44919 Ulsan, Korea
| | - Minkyo Jung
- Neural Circuit Research Group, Korea Brain Research Institute, 41062 Daegu, Korea
| | - Truong Thi My Nhung
- Department of Life Sciences, Pohang University of Science and Technology, 37673 Pohang, Korea
| | - Myeong-Gyun Kang
- Department of Chemistry, Seoul National University, 08826 Seoul, Korea
- Department of Chemistry, Ulsan National Institute of Science and Technology, 44919 Ulsan, Korea
| | - Chaiheon Lee
- Department of Chemistry, Ulsan National Institute of Science and Technology, 44919 Ulsan, Korea
| | - Tae-Hyuk Kwon
- Department of Chemistry, Ulsan National Institute of Science and Technology, 44919 Ulsan, Korea
| | - Sang Ki Park
- Department of Life Sciences, Pohang University of Science and Technology, 37673 Pohang, Korea
| | - Ji Young Mun
- Neural Circuit Research Group, Korea Brain Research Institute, 41062 Daegu, Korea;
| | - Jong-Seo Kim
- Center for RNA Research, Institute for Basic Science, Seoul 08826, Korea;
- School of Biological Sciences, Seoul National University, 08826 Seoul, Korea
| | - Hyun-Woo Rhee
- Department of Chemistry, Seoul National University, 08826 Seoul, Korea;
- School of Biological Sciences, Seoul National University, 08826 Seoul, Korea
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207
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Silva-Palacios A, Zazueta C, Pedraza-Chaverri J. ER membranes associated with mitochondria: Possible therapeutic targets in heart-associated diseases. Pharmacol Res 2020; 156:104758. [PMID: 32200027 DOI: 10.1016/j.phrs.2020.104758] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 02/06/2020] [Accepted: 03/16/2020] [Indexed: 12/14/2022]
Abstract
Cardiovascular system cell biology is tightly regulated and mitochondria play a relevant role in maintaining heart function. In recent decades, associations between such organelles and the sarco/endoplasmic reticulum (SR) have been raised great interest. Formally identified as mitochondria-associated SR membranes (MAMs), these structures regulate different cellular functions, including calcium management, lipid metabolism, autophagy, oxidative stress, and management of unfolded proteins. In this review, we highlight MAMs' alterations mainly in cardiomyocytes, linked with cardiovascular diseases, such as cardiac ischemia-reperfusion, heart failure, and dilated cardiomyopathy. We also describe proteins that are part of the MAMs' machinery, as the FUN14 domain containing 1 (FUNDC1), the sigma 1 receptor (Sig-1R) and others, which might be new molecular targets to preserve the function and structure of the heart in such diseases. Understanding the machinery of MAMs and its function demands our attention, as such knowledge might contribute to strengthen the role of these relative novel structures in heart diseases.
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Affiliation(s)
- Alejandro Silva-Palacios
- Department of Cardiovascular Biomedicine, National Institute of Cardiology-Ignacio Chávez, Mexico City, Mexico.
| | - Cecilia Zazueta
- Department of Cardiovascular Biomedicine, National Institute of Cardiology-Ignacio Chávez, Mexico City, Mexico
| | - José Pedraza-Chaverri
- Department of Biology, Faculty of Chemistry, National Autonomous University of Mexico, Circuito Exterior S/N, C. U., 04510, Mexico City, Mexico.
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208
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Morel E. Endoplasmic Reticulum Membrane and Contact Site Dynamics in Autophagy Regulation and Stress Response. Front Cell Dev Biol 2020; 8:343. [PMID: 32548114 PMCID: PMC7272771 DOI: 10.3389/fcell.2020.00343] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 04/20/2020] [Indexed: 12/15/2022] Open
Abstract
Autophagy mobilizes a variety of intracellular endomembranes to ensure a proper stress response and the maintenance of cellular homeostasis. While the process of de novo biogenesis of pre-autophagic structures is not yet fully characterized, the role of the endoplasmic reticulum (ER) appears to be crucial in early steps of autophagic process. Here, I review and discuss various aspects of ER and ER-driven membrane contact site requirements and effects on mammalian organelles and endomembrane biogenesis, in particular during the early steps of autophagy-related membrane dynamics.
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Affiliation(s)
- Etienne Morel
- Cell Biology Department, Institut Necker-Enfants Malades (INEM), INSERM U1151-CNRS UMR 8253, Université de Paris, Paris, France
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209
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Khan S, Raj D, Jaiswal K, Lahiri A. Modulation of host mitochondrial dynamics during bacterial infection. Mitochondrion 2020; 53:140-149. [PMID: 32470613 DOI: 10.1016/j.mito.2020.05.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 05/15/2020] [Accepted: 05/22/2020] [Indexed: 12/15/2022]
Abstract
Mitochondria is a dynamic organelle of the cell that can regulate and maintain cellular ATP level, ROS production, calcium signaling and immune response. In order to retain their shape and distribution, mitochondria go through coordinated cycles of fission and fusion. Further, dysfunctional mitochondria are selectively eliminated from the cell via mitophagy to synchronize mitochondrial quality control and cellular homeostasis. In addition, mitochondria when in close proximity with the endoplasmic reticulum can alter the signaling pathways and some recent findings also reveal a direct correlation between the mitochondrial localization in the cell to the immune response elicited against the invading pathogen. These modulations in the mitochondrial network are collectively termed as 'mitochondrial dynamics'. Diverse bacteria, virus and parasitic pathogens upon infecting a cell can alter the host mitochondrial dynamics in favor of their multiplication and this in turn can be a major determinant of the disease outcome. Pharmacological perturbations in these pathways thus could lead to generation of additional therapeutic opportunities. This review will focus on the pathogenic modulation of the host mitochondrial dynamics, specifically during the bacterial infections and describes how dysregulated mitochondrial dynamics facilitates the pathogen's ability to establish efficient infection.
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Affiliation(s)
- Shaziya Khan
- Pharmacology Division, CSIR-Central Drug Research Institute, Lucknow 226031, India; Academy of Scientific and Innovative Research (AcSIR), New Delhi 110001, India
| | - Desh Raj
- Pharmacology Division, CSIR-Central Drug Research Institute, Lucknow 226031, India; Academy of Scientific and Innovative Research (AcSIR), New Delhi 110001, India
| | - Kritika Jaiswal
- Pharmacology Division, CSIR-Central Drug Research Institute, Lucknow 226031, India
| | - Amit Lahiri
- Pharmacology Division, CSIR-Central Drug Research Institute, Lucknow 226031, India; Academy of Scientific and Innovative Research (AcSIR), New Delhi 110001, India.
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210
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O'Malley J, Kumar R, Inigo J, Yadava N, Chandra D. Mitochondrial Stress Response and Cancer. Trends Cancer 2020; 6:688-701. [PMID: 32451306 DOI: 10.1016/j.trecan.2020.04.009] [Citation(s) in RCA: 98] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 04/16/2020] [Accepted: 04/22/2020] [Indexed: 12/20/2022]
Abstract
Cancer cells survive and adapt to many types of stress including hypoxia, nutrient deprivation, metabolic, and oxidative stress. These stresses are sensed by diverse cellular signaling processes, leading to either degradation of mitochondria or alleviation of mitochondrial stress. This review discusses signaling during sensing and mitigation of stress involving mitochondrial communication with the endoplasmic reticulum, and how retrograde signaling upregulates the mitochondrial stress response to maintain mitochondrial integrity. The importance of the mitochondrial unfolded protein response, an emerging pathway that alleviates cellular stress, will be elaborated with respect to cancer. Detailed understanding of cellular pathways will establish mitochondrial stress response as a key mechanism for cancer cell survival leading to cancer progression and resistance, and provide a potential therapeutic target in cancer.
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Affiliation(s)
- Jordan O'Malley
- Department of Pharmacology and Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Rahul Kumar
- Department of Pharmacology and Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Joseph Inigo
- Department of Pharmacology and Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Nagendra Yadava
- Department of Anesthesiology and Center for Shock, Trauma, and Anesthesiology Research, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Dhyan Chandra
- Department of Pharmacology and Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA.
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211
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Jiang Z, Liu H, He H, Yadava N, Chambers JJ, Thayumanavan S. Anionic Polymers Promote Mitochondrial Targeting of Delocalized Lipophilic Cations. Bioconjug Chem 2020; 31:1344-1353. [PMID: 32208679 PMCID: PMC7347245 DOI: 10.1021/acs.bioconjchem.0c00079] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Mitochondria are therapeutic targets in many diseases including cancer, metabolic disorders, and neurodegenerative diseases. Therefore, strategies to deliver therapeutics of interest to mitochondria are important for therapeutic development. As delocalized lipophilic cations (DLCs) preferentially accumulate in mitochondria, DLC-conjugation has been utilized to facilitate therapeutic delivery systems with mitochondrial targeting capability. Here we report that upon DLC-conjugation, anionic polymers exhibit significantly improved mitochondrial targeting when compared to cationic polymers and charge-neutral polymers. Considering that the cell membrane generally bears a net negative charge, the observed phenomenon is unexpected. Notably, the DLC-conjugated anionic polymers circumvent endosomal entrapment. The rapid mitochondrial accumulation of DLC-conjugated anionic polymers is likely a membrane-potential-driven process, along with the involvement of the mitochondrial pyruvate carrier. Moreover, the structural variations on the side chain of DLC-conjugated anionic polymers do not compromise the overall mitochondrial targeting capability, widely extending the applicability of anionic macromolecules in therapeutic delivery systems.
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Affiliation(s)
- Ziwen Jiang
- Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA
| | - Hongxu Liu
- Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA
| | - Huan He
- Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA
| | - Nagendra Yadava
- Department of Biology, University of Massachusetts, Amherst, Massachusetts 01003, USA
- Molecular and Cellular Biology Program, University of Massachusetts, Amherst, Massachusetts 01003, USA
| | - James J. Chambers
- Center for Bioactive Delivery – Institute for Applied Life Sciences, University of Massachusetts, Amherst, Massachusetts 01003, USA
| | - S. Thayumanavan
- Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA
- Molecular and Cellular Biology Program, University of Massachusetts, Amherst, Massachusetts 01003, USA
- Center for Bioactive Delivery – Institute for Applied Life Sciences, University of Massachusetts, Amherst, Massachusetts 01003, USA
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212
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Uddin MS, Tewari D, Sharma G, Kabir MT, Barreto GE, Bin-Jumah MN, Perveen A, Abdel-Daim MM, Ashraf GM. Molecular Mechanisms of ER Stress and UPR in the Pathogenesis of Alzheimer's Disease. Mol Neurobiol 2020; 57:2902-2919. [PMID: 32430843 DOI: 10.1007/s12035-020-01929-y] [Citation(s) in RCA: 106] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2020] [Accepted: 05/01/2020] [Indexed: 01/01/2023]
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative disease involving aggregation of misfolded proteins inside the neuron causing prolonged cellular stress. The neuropathological hallmarks of AD include the formation of senile plaques and neurofibrillary tangles in specific brain regions that lead to synaptic loss and neuronal death. The exact mechanism of neuron dysfunction in AD remains obscure. In recent years, endoplasmic reticulum (ER) dysfunction has been implicated in neuronal degeneration seen in AD. Apart from AD, many other diseases also involve misfolded proteins aggregations in the ER, a condition referred to as ER stress. The response of the cell to ER stress is to activate a group of signaling pathways called unfolded protein response (UPR) that stimulates a particular transcriptional program to restore ER function and ensure cell survival. ER stress also involves the generation of reactive oxygen species (ROS) that, together with mitochondrial ROS and decreased effectiveness of antioxidant mechanisms, producing a condition of chronic oxidative stress. The unfolded proteins may not always produce a response that leads to the restoration of cellular functions, but they may also lead to inflammation by a set of different pathways with deleterious consequences. In this review, we extensively discuss the role of ER stress and how to target it using different pharmacological approaches in AD development and onset.
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Affiliation(s)
- Md Sahab Uddin
- Department of Pharmacy, Southeast University, Dhaka, Bangladesh.
- Pharmakon Neuroscience Research Network, Dhaka, Bangladesh.
| | - Devesh Tewari
- Department of Pharmacognosy, School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab, India
| | - Gaurav Sharma
- Department of Physiology, AIIMS Jodhpur, Jodhpur, India
| | | | - George E Barreto
- Department of Biological Sciences, University of Limerick, Limerick, Ireland.
- Instituto de Ciencias Biomédicas, Universidad Autónoma de Chile, Santiago, Chile.
| | - May N Bin-Jumah
- Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, Riyadh 11474, Saudi Arabia
| | - Asma Perveen
- Glocal School of Life Sciences, Glocal University, Saharanpur, India
| | - Mohamed M Abdel-Daim
- Department of Zoology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
- Pharmacology Department, Faculty of Veterinary Medicine, Suez Canal University, Ismailia 41522, Egypt
| | - Ghulam Md Ashraf
- King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia.
- Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia.
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213
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Hijazi I, Knupp J, Chang A. Retrograde signaling mediates an adaptive survival response to endoplasmic reticulum stress in Saccharomyces cerevisiae. J Cell Sci 2020; 133:jcs.241539. [PMID: 32005698 DOI: 10.1242/jcs.241539] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 01/23/2020] [Indexed: 12/11/2022] Open
Abstract
One major cause of endoplasmic reticulum (ER) stress is homeostatic imbalance between biosynthetic protein folding and protein folding capacity. Cells utilize mechanisms such as the unfolded protein response (UPR) to cope with ER stress. Nevertheless, when ER stress is prolonged or severe, cell death may occur, accompanied by production of mitochondrial reactive oxygen species (ROS). Using a yeast model (Saccharomyces cerevisiae), we describe an innate, adaptive response to ER stress to increase select mitochondrial proteins, O2 consumption and cell survival. The mitochondrial response allows cells to resist additional ER stress. The ER stress-induced mitochondrial response is mediated by activation of retrograde (RTG) signaling to enhance anapleurotic reactions of the tricarboxylic acid cycle. Mitochondrial response to ER stress is accompanied by inactivation of the conserved TORC1 pathway, and activation of Snf1/AMPK, the conserved energy sensor and regulator of metabolism. Our results provide new insight into the role of respiration in cell survival in the face of ER stress, and should help in developing therapeutic strategies to limit cell death in disorders linked to ER stress.This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Imadeddin Hijazi
- Department of Molecular, Cellular and Developmental Biology, University of Michigan, 1105 N University, Ann Arbor, MI 48109, USA
| | - Jeffrey Knupp
- Department of Molecular, Cellular and Developmental Biology, University of Michigan, 1105 N University, Ann Arbor, MI 48109, USA
| | - Amy Chang
- Department of Molecular, Cellular and Developmental Biology, University of Michigan, 1105 N University, Ann Arbor, MI 48109, USA
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214
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Salivary Histatin 1 and 2 Are Targeted to Mitochondria and Endoplasmic Reticulum in Human Cells. Cells 2020; 9:cells9040795. [PMID: 32225006 PMCID: PMC7226139 DOI: 10.3390/cells9040795] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 03/20/2020] [Accepted: 03/25/2020] [Indexed: 01/24/2023] Open
Abstract
Human salivary histatin 1 (Hst1) and Hst2 exhibit a series of cell-activating properties (e.g., promoting adhesion, spreading, migration and metabolic activity of mammalian cells). In contrast, Hst5 shows an anti-fungal property but no cell-activating properties. Previous findings suggest that their uptake and association with subcellular targets may play a determinant role in their functions. In this study, we studied the uptake dynamics and subcellular targets of Hst1, Hst2 and Hst5 in epithelial cells (HO1N1 human buccal carcinoma epithelial cell line). Confocal laser scanning microscopy (CLSM) revealed that fluorescently labeled Hst1 (F-Hst1) was taken up into the intracellular space of epithelial cells. Then, 60 min post-incubation, the total fluorescence of cell-associated F-Hst1, as measured using flow cytometry, was significantly higher compared to those of F-Hst2 and F-Hst5. In contrast, virtually no association occurred using the negative control—scrambled F-Hst1 (F-Hstscr). CLSM images revealed that F-Hst1, 2 and 5 co-localized with mitotrackerTM-labeled mitochondria. In addition, F-Hst1 and F-Hst2 but neither F-Hst5 nor F-Hst1scr co-localized with the ER-trackerTM-labeled endoplasmic reticulum. No co-localization of Hst1, 2 and 5 with lysosomes or the Golgi apparatus was observed. Furthermore, Hst1 and Hst2 but not Hst5 or Hst1scr significantly promoted the metabolic activity of both human epithelial cell lines, HaCaT human keratinocytes and primary human gingival fibroblasts.
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215
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Abstract
Owing to their ability to efficiently generate ATP required to sustain normal cell function, mitochondria are often considered the 'powerhouses of the cell'. However, our understanding of the role of mitochondria in cell biology recently expanded when we recognized that they are key platforms for a plethora of cell signalling cascades. This functional versatility is tightly coupled to constant reshaping of the cellular mitochondrial network in a series of processes, collectively referred to as mitochondrial membrane dynamics and involving organelle fusion and fission (division) as well as ultrastructural remodelling of the membrane. Accordingly, mitochondrial dynamics influence and often orchestrate not only metabolism but also complex cell signalling events, such as those involved in regulating cell pluripotency, division, differentiation, senescence and death. Reciprocally, mitochondrial membrane dynamics are extensively regulated by post-translational modifications of its machinery and by the formation of membrane contact sites between mitochondria and other organelles, both of which have the capacity to integrate inputs from various pathways. Here, we discuss mitochondrial membrane dynamics and their regulation and describe how bioenergetics and cellular signalling are linked to these dynamic changes of mitochondrial morphology.
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216
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Omer S, Koumangoye R, Delpire E. A mutation in the Na-K-2Cl cotransporter-1 leads to changes in cellular metabolism. J Cell Physiol 2020; 235:7239-7250. [PMID: 32039487 DOI: 10.1002/jcp.29623] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 01/27/2020] [Indexed: 12/12/2022]
Abstract
The Na-K-Cl cotransporter-1 (NKCC1), by mediating the electroneutral transport of Na+ , K+ , and Cl- plays an important role in cell volume regulation, epithelial transport, and the control of neuronal excitability. Recently, we reported the first known human mutation in SLC12A2, the gene encoding NKCC1. The 17-year old patient suffers from multiorgan failure. Laboratory tests conducted on muscle and liver biopsies of the patient showed abnormal increase in mitochondrial DNA copy number and increased glycogen levels, indicating the possibility that the transporter may play a role in energy metabolism. Here, we show that fibroblasts isolated from the patient demonstrate a significant increase in mitochondrial respiration, compared to fibroblasts isolated from healthy individuals. Similarly, Madin Darby canine kidney (MDCK) cells transfected with enhanced green fluorescent protein (EGFP)-tagged mutant NKCC1 DNA demonstrated increased mitochondrial respiration when compared to MDCK cells expressing EGFP-tagged wild-type (WT) cotransporter. Direct inhibition of the cotransporter through addition of bumetanide did not change the rate of basal respiration, but led to increased maximal mitochondrial respiration. Fibroblasts extracted from NKCC1WT/DFX and NKCC1DFX/DFX mice also demonstrated a significant elevation in mitochondrial respiration, compared to fibroblasts isolated from their WT littermates. Expression of the mutant protein was associated with an increase in hydrogen peroxide and peroxidase activity and a decrease in messenger RNA transcript levels for protein involved in the unfolded protein response. These data reveal that cells expressing the mutant cotransporter demonstrate increased mitochondrial respiration and behave like they are experiencing a state of starvation.
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Affiliation(s)
- Salma Omer
- Department of Anesthesiology, Vanderbilt University School of Medicine, Nashville, Tennessee.,Neuroscience Graduate Program, Vanderbilt University, Nashville, Tennessee
| | - Rainelli Koumangoye
- Department of Anesthesiology, Vanderbilt University School of Medicine, Nashville, Tennessee
| | - Eric Delpire
- Department of Anesthesiology, Vanderbilt University School of Medicine, Nashville, Tennessee.,Neuroscience Graduate Program, Vanderbilt University, Nashville, Tennessee
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217
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Sarcoplasmic reticulum and calcium signaling in muscle cells: Homeostasis and disease. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2020; 350:197-264. [PMID: 32138900 DOI: 10.1016/bs.ircmb.2019.12.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The sarco/endoplasmic reticulum is an extensive, dynamic and heterogeneous membranous network that fulfills multiple homeostatic functions. Among them, it compartmentalizes, stores and releases calcium within the intracellular space. In the case of muscle cells, calcium released from the sarco/endoplasmic reticulum in the vicinity of the contractile machinery induces cell contraction. Furthermore, sarco/endoplasmic reticulum-derived calcium also regulates gene transcription in the nucleus, energy metabolism in mitochondria and cytosolic signaling pathways. These diverse and overlapping processes require a highly complex fine-tuning that the sarco/endoplasmic reticulum provides by means of its numerous tubules and cisternae, specialized domains and contacts with other organelles. The sarco/endoplasmic reticulum also possesses a rich calcium-handling machinery, functionally coupled to both contraction-inducing stimuli and the contractile apparatus. Such is the importance of the sarco/endoplasmic reticulum for muscle cell physiology, that alterations in its structure, function or its calcium-handling machinery are intimately associated with the development of cardiometabolic diseases. Cardiac hypertrophy, insulin resistance and arterial hypertension are age-related pathologies with a common mechanism at the muscle cell level: the accumulation of damaged proteins at the sarco/endoplasmic reticulum induces a stress response condition termed endoplasmic reticulum stress, which impairs proper organelle function, ultimately leading to pathogenesis.
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218
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Sironi L, Restelli LM, Tolnay M, Neutzner A, Frank S. Dysregulated Interorganellar Crosstalk of Mitochondria in the Pathogenesis of Parkinson's Disease. Cells 2020; 9:cells9010233. [PMID: 31963435 PMCID: PMC7016713 DOI: 10.3390/cells9010233] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 01/15/2020] [Accepted: 01/16/2020] [Indexed: 12/11/2022] Open
Abstract
The pathogenesis of Parkinson’s disease (PD), the second most common neurodegenerative disorder, is complex and involves the impairment of crucial intracellular physiological processes. Importantly, in addition to abnormal α-synuclein aggregation, the dysfunction of various mitochondria-dependent processes has been prominently implicated in PD pathogenesis. Besides the long-known loss of the organelles’ bioenergetics function resulting in diminished ATP synthesis, more recent studies in the field have increasingly focused on compromised mitochondrial quality control as well as impaired biochemical processes specifically localized to ER–mitochondria interfaces (such as lipid biosynthesis and calcium homeostasis). In this review, we will discuss how dysregulated mitochondrial crosstalk with other organelles contributes to PD pathogenesis.
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Affiliation(s)
- Lara Sironi
- Division of Neuropathology, Institute of Medical Genetics and Pathology, University Hospital Basel, 4031 Basel, Switzerland; (L.M.R.); (M.T.)
- Correspondence: (L.S.); (S.F.); Tel.: +41-61-265-2776 (L.S. & S.F.)
| | - Lisa Michelle Restelli
- Division of Neuropathology, Institute of Medical Genetics and Pathology, University Hospital Basel, 4031 Basel, Switzerland; (L.M.R.); (M.T.)
| | - Markus Tolnay
- Division of Neuropathology, Institute of Medical Genetics and Pathology, University Hospital Basel, 4031 Basel, Switzerland; (L.M.R.); (M.T.)
| | - Albert Neutzner
- Department of Biomedicine, University Hospital Basel, University of Basel, 4031 Basel, Switzerland;
- Department of Ophthalmology University Hospital Basel, University of Basel, 4031 Basel, Switzerland
| | - Stephan Frank
- Division of Neuropathology, Institute of Medical Genetics and Pathology, University Hospital Basel, 4031 Basel, Switzerland; (L.M.R.); (M.T.)
- Correspondence: (L.S.); (S.F.); Tel.: +41-61-265-2776 (L.S. & S.F.)
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219
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Pore-forming toxins from sea anemones: from protein-membrane interaction to its implications for developing biomedical applications. ADVANCES IN BIOMEMBRANES AND LIPID SELF-ASSEMBLY 2020. [DOI: 10.1016/bs.abl.2020.02.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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220
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Yousuf MS, Maguire AD, Simmen T, Kerr BJ. Endoplasmic reticulum-mitochondria interplay in chronic pain: The calcium connection. Mol Pain 2020; 16:1744806920946889. [PMID: 32787562 PMCID: PMC7427143 DOI: 10.1177/1744806920946889] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 06/26/2020] [Indexed: 12/14/2022] Open
Abstract
Chronic pain is a debilitating condition that affects roughly a third to a half of the world's population. Despite its substantial effect on society, treatment for chronic pain is modest, at best, notwithstanding its side effects. Hence, novel therapeutics are direly needed. Emerging evidence suggests that calcium plays an integral role in mediating neuronal plasticity that underlies sensitization observed in chronic pain states. The endoplasmic reticulum and the mitochondria are the largest calcium repositories in a cell. Here, we review how stressors, like accumulation of misfolded proteins and oxidative stress, influence endoplasmic reticulum and mitochondria function and contribute to chronic pain. We further examine the shuttling of calcium across the mitochondrial-associated membrane as a mechanism of cross-talk between the endoplasmic reticulum and the mitochondria. In addition, we discuss how endoplasmic reticulum stress, mitochondrial impairment, and calcium dyshomeostasis are implicated in various models of neuropathic pain. We propose a novel framework of endoplasmic reticulum-mitochondria signaling in mediating pain hypersensitivity. These observations require further investigation in order to develop novel therapies for chronic pain.
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Affiliation(s)
- Muhammad Saad Yousuf
- Neuroscience and Mental Health Institute, University of Alberta, Edmonton, Canada
| | - Aislinn D Maguire
- Neuroscience and Mental Health Institute, University of Alberta, Edmonton, Canada
| | - Thomas Simmen
- Department of Cell Biology, University of Alberta, Edmonton, Canada
| | - Bradley J Kerr
- Neuroscience and Mental Health Institute, University of Alberta, Edmonton, Canada
- Department of Pharmacology, University of Alberta, Edmonton, Canada
- Department of Anesthesiology and Pain Medicine, University of Alberta, Edmonton, Canada
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221
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Prinz WA, Toulmay A, Balla T. The functional universe of membrane contact sites. Nat Rev Mol Cell Biol 2020; 21:7-24. [PMID: 31732717 PMCID: PMC10619483 DOI: 10.1038/s41580-019-0180-9] [Citation(s) in RCA: 425] [Impact Index Per Article: 85.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/23/2019] [Indexed: 12/13/2022]
Abstract
Organelles compartmentalize eukaryotic cells, enhancing their ability to respond to environmental and developmental changes. One way in which organelles communicate and integrate their activities is by forming close contacts, often called 'membrane contact sites' (MCSs). Interest in MCSs has grown dramatically in the past decade as it is has become clear that they are ubiquitous and have a much broader range of critical roles in cells than was initially thought. Indeed, functions for MCSs in intracellular signalling (particularly calcium signalling, reactive oxygen species signalling and lipid signalling), autophagy, lipid metabolism, membrane dynamics, cellular stress responses and organelle trafficking and biogenesis have now been reported.
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Affiliation(s)
- William A Prinz
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA.
| | - Alexandre Toulmay
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Tamas Balla
- National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA
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222
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Li J, Zhang D, Brundel BJJM, Wiersma M. Imbalance of ER and Mitochondria Interactions: Prelude to Cardiac Ageing and Disease? Cells 2019; 8:cells8121617. [PMID: 31842269 PMCID: PMC6952992 DOI: 10.3390/cells8121617] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Revised: 12/06/2019] [Accepted: 12/10/2019] [Indexed: 12/19/2022] Open
Abstract
Cardiac disease is still the leading cause of morbidity and mortality worldwide, despite some exciting and innovative improvements in clinical management. In particular, atrial fibrillation (AF) and heart failure show a steep increase in incidence and healthcare costs due to the ageing population. Although research revealed novel insights in pathways driving cardiac disease, the exact underlying mechanisms have not been uncovered so far. Emerging evidence indicates that derailed proteostasis (i.e., the homeostasis of protein expression, function and clearance) is a central component driving cardiac disease. Within proteostasis derailment, key roles for endoplasmic reticulum (ER) and mitochondrial stress have been uncovered. Here, we describe the concept of ER and mitochondrial stress and the role of interactions between the ER and mitochondria, discuss how imbalance in the interactions fuels cardiac ageing and cardiac disease (including AF), and finally assess the potential of drugs directed at conserving the interaction as an innovative therapeutic target to improve cardiac function.
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Affiliation(s)
- Jin Li
- Correspondence: (J.L.); (M.W.)
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223
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Stocco E, Barbon S, Piccione M, Belluzzi E, Petrelli L, Pozzuoli A, Ramonda R, Rossato M, Favero M, Ruggieri P, Porzionato A, Di Liddo R, De Caro R, Macchi V. Infrapatellar Fat Pad Stem Cells Responsiveness to Microenvironment in Osteoarthritis: From Morphology to Function. Front Cell Dev Biol 2019; 7:323. [PMID: 31921840 PMCID: PMC6914674 DOI: 10.3389/fcell.2019.00323] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 11/25/2019] [Indexed: 12/16/2022] Open
Abstract
Recently, infrapatellar fat pad (IFP) has been considered as a source of stem cells for cartilage regeneration in osteoarthritis (OA) due to their ability for differentiation into chondrocytes. However, stressful conditions, like that related to OA, may induce a pathogenic reprograming. The aim of this study was to characterize the structural and functional properties of a new population of stem cells isolated from osteoarthritic infrapatellar fat pad (OA-IFP). Nine OA patients undergoing total knee arthroplasty (TKA) were enrolled in this study [median age = 74 years, interquartile range (IQR) = 78.25-67.7; median body mass index = 29.4 Kg/m2, IQR = 31.7-27.4]. OA-IFP stem cells were isolated and characterized for morphology, stemness, metabolic profile and multi-differentiative potential by transmission electron microscopy, flow cytometric analysis, gene expression study and cytochemistry. OA-IFP stem cells displayed a spindle-like morphology, self-renewal potential and responsiveness (CD44, CD105, VEGFR2, FGFR2, IL1R, and IL6R) to microenvironmental stimuli. Characterized by high grade of stemness (STAT3, NOTCH1, c-Myc, OCT-4, KLF4, and NANOG), the cells showed peculiar immunophenotypic properties (CD73+/CD39+/CD90+/CD105+/CD44–/+/CD45–). The expression of HLA-DR, CD34, Fas and FasL was indicative of a possible phenotypic reprograming induced by inflammation. Moreover, the response to mechanical stimuli together with high expression level of COL1A1 gene, suggested their possible protective response against in vivo mechanical overloading. Conversely, the low expression of CD38/NADase was indicative of their inability to counteract NAD+-mediated OA inflammation. Based on the ultrastructural, immunophenotypic and functional characterization, OA-IFP stem cells were hypothesized to be primed by the pathological environment and to exert incomplete protective activity from OA inflammation.
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Affiliation(s)
- Elena Stocco
- Department of Neurosciences, Institute of Human Anatomy, University of Padova, Padua, Italy.,LifeLab Program, Consorzio per la Ricerca Sanitaria (CORIS), Padua, Italy.,Foundation for Biology and Regenerative Medicine, Tissue Engineering and Signaling ONLUS, Padua, Italy
| | - Silvia Barbon
- Department of Neurosciences, Institute of Human Anatomy, University of Padova, Padua, Italy.,LifeLab Program, Consorzio per la Ricerca Sanitaria (CORIS), Padua, Italy.,Foundation for Biology and Regenerative Medicine, Tissue Engineering and Signaling ONLUS, Padua, Italy
| | - Monica Piccione
- Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Padua, Italy
| | - Elisa Belluzzi
- Musculoskeletal Pathology and Oncology Laboratory, Department of Surgery, Oncology and Gastroenterology DiSCOG, University of Padova, Padua, Italy.,Department of Orthopaedics and Orthopaedic Oncology, University of Padova, Padua, Italy
| | - Lucia Petrelli
- Department of Neurosciences, Institute of Human Anatomy, University of Padova, Padua, Italy
| | - Assunta Pozzuoli
- Musculoskeletal Pathology and Oncology Laboratory, Department of Surgery, Oncology and Gastroenterology DiSCOG, University of Padova, Padua, Italy.,Department of Orthopaedics and Orthopaedic Oncology, University of Padova, Padua, Italy
| | - Roberta Ramonda
- Rheumatology Unit, Department of Medicine - DIMED, University Hospital of Padova, Padua, Italy
| | - Marco Rossato
- Clinica Medica 3, Department of Medicine - DIMED, University of Padova, Padua, Italy
| | - Marta Favero
- Rheumatology Unit, Department of Medicine - DIMED, University Hospital of Padova, Padua, Italy
| | - Pietro Ruggieri
- Department of Orthopaedics and Orthopaedic Oncology, University of Padova, Padua, Italy
| | - Andrea Porzionato
- Department of Neurosciences, Institute of Human Anatomy, University of Padova, Padua, Italy.,LifeLab Program, Consorzio per la Ricerca Sanitaria (CORIS), Padua, Italy
| | - Rosa Di Liddo
- Foundation for Biology and Regenerative Medicine, Tissue Engineering and Signaling ONLUS, Padua, Italy.,Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Padua, Italy
| | - Raffaele De Caro
- Department of Neurosciences, Institute of Human Anatomy, University of Padova, Padua, Italy.,LifeLab Program, Consorzio per la Ricerca Sanitaria (CORIS), Padua, Italy
| | - Veronica Macchi
- Department of Neurosciences, Institute of Human Anatomy, University of Padova, Padua, Italy.,LifeLab Program, Consorzio per la Ricerca Sanitaria (CORIS), Padua, Italy
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224
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Sharma A, Smith HJ, Yao P, Mair WB. Causal roles of mitochondrial dynamics in longevity and healthy aging. EMBO Rep 2019; 20:e48395. [PMID: 31667999 PMCID: PMC6893295 DOI: 10.15252/embr.201948395] [Citation(s) in RCA: 132] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Revised: 07/24/2019] [Accepted: 10/09/2019] [Indexed: 12/14/2022] Open
Abstract
Mitochondria are organized in the cell in the form of a dynamic, interconnected network. Mitochondrial dynamics, regulated by mitochondrial fission, fusion, and trafficking, ensure restructuring of this complex reticulum in response to nutrient availability, molecular signals, and cellular stress. Aberrant mitochondrial structures have long been observed in aging and age-related diseases indicating that mitochondrial dynamics are compromised as cells age. However, the specific mechanisms by which aging affects mitochondrial dynamics and whether these changes are causally or casually associated with cellular and organismal aging is not clear. Here, we review recent studies that show specifically how mitochondrial fission, fusion, and trafficking are altered with age. We discuss factors that change with age to directly or indirectly influence mitochondrial dynamics while examining causal roles for altered mitochondrial dynamics in healthy aging and underlying functional outputs that might affect longevity. Lastly, we propose that altered mitochondrial dynamics might not just be a passive consequence of aging but might constitute an adaptive mechanism to mitigate age-dependent cellular impairments and might be targeted to increase longevity and promote healthy aging.
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Affiliation(s)
- Arpit Sharma
- Department of Genetics and Complex DiseasesHarvard T.H. Chan School of Public HealthBostonMAUSA
| | - Hannah J Smith
- Department of Genetics and Complex DiseasesHarvard T.H. Chan School of Public HealthBostonMAUSA
| | - Pallas Yao
- Department of Genetics and Complex DiseasesHarvard T.H. Chan School of Public HealthBostonMAUSA
| | - William B Mair
- Department of Genetics and Complex DiseasesHarvard T.H. Chan School of Public HealthBostonMAUSA
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225
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MCP-1/MCPIP-1 Signaling Modulates the Effects of IL-1β in Renal Cell Carcinoma through ER Stress-Mediated Apoptosis. Int J Mol Sci 2019; 20:ijms20236101. [PMID: 31816951 PMCID: PMC6928829 DOI: 10.3390/ijms20236101] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 11/21/2019] [Accepted: 11/29/2019] [Indexed: 01/07/2023] Open
Abstract
In renal cell carcinoma (RCC), interleukin (IL)-1β may be a pro-metastatic cytokine. However, we have not yet noted the clinical association between tumoral expression or serum level of IL-1β and RCC in our patient cohort. Herein, we investigate molecular mechanisms elicited by IL-1β in RCC. We found that IL-1β stimulates substantial monocyte chemoattractant protein (MCP)-1 production in RCC cells by activating NF-kB and AP-1. In our xenograft RCC model, intra-tumoral MCP-1 injection down-regulated Ki67 expression and reduced tumor size. Microarray analysis revealed that MCP-1 treatment altered protein-folding processes in RCC cells. MCP-1-treated RCC cells and xenograft tumors expressed MCP-1-induced protein (MCPIP) and molecules involved in endoplasmic reticulum (ER) stress-mediated apoptosis, namely C/EBP Homologous Protein (CHOP), protein kinase-like ER kinase (PERK), and calnexin (CNX). ER stress-mediated apoptosis in MCP-1-treated RCC cells was confirmed using Terminal deoxynucleotidyl transferase dUTP Nick-End Labeling (TUNEL) assay. Moreover, ectopic MCPIP expression increased PERK expression in Human embryonic kidney (HEK)293 cells. Our meta-analysis revealed that low MCP-1 levels reduce 1-year post-nephrectomy survival in patients with RCC. Immunohistochemistry indicated that in some RCC biopsy samples, the correlation between MCP-1 or MCPIP expression and tumor stages was inverse. Thus, MCP-1 and MCPIP potentially reduce the IL-1β-mediated oncogenic effect in RCC; our findings suggest that ER stress is a potential RCC treatment target.
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226
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Martino Adami PV, Nichtová Z, Weaver DB, Bartok A, Wisniewski T, Jones DR, Do Carmo S, Castaño EM, Cuello AC, Hajnóczky G, Morelli L. Perturbed mitochondria-ER contacts in live neurons that model the amyloid pathology of Alzheimer's disease. J Cell Sci 2019; 132:jcs.229906. [PMID: 31515277 DOI: 10.1242/jcs.229906] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Accepted: 09/02/2019] [Indexed: 01/05/2023] Open
Abstract
The use of fixed fibroblasts from familial and sporadic Alzheimer's disease patients has previously indicated an upregulation of mitochondria-ER contacts (MERCs) as a hallmark of Alzheimer's disease. Despite its potential significance, the relevance of these results is limited because they were not extended to live neurons. Here we performed a dynamic in vivo analysis of MERCs in hippocampal neurons from McGill-R-Thy1-APP transgenic rats, a model of Alzheimer's disease-like amyloid pathology. Live FRET imaging of neurons from transgenic rats revealed perturbed 'lipid-MERCs' (gap width <10 nm), while 'Ca2+-MERCs' (10-20 nm gap width) were unchanged. In situ TEM showed no significant differences in the lipid-MERCs:total MERCs or lipid-MERCs:mitochondria ratios; however, the average length of lipid-MERCs was significantly decreased in neurons from transgenic rats as compared to controls. In accordance with FRET results, untargeted lipidomics showed significant decreases in levels of 12 lipids and bioenergetic analysis revealed respiratory dysfunction of mitochondria from transgenic rats. Thus, our results reveal changes in MERC structures coupled with impaired mitochondrial functions in Alzheimer's disease-related neurons.This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Pamela V Martino Adami
- Laboratory of Brain Aging and Neurodegeneration, Fundación Instituto Leloir, IIBBA-CONICET, Av. Patricias Argentinas 435, C1405BWE Ciudad Autónoma de Buenos Aires, Argentina.,Division of Neurogenetics and Molecular Psychiatry, Department of Psychiatry and Psychotherapy, University of Cologne, 50937 Cologne, Germany
| | - Zuzana Nichtová
- MitoCare Center for Mitochondrial Imaging Research and Diagnostics, Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | - David B Weaver
- MitoCare Center for Mitochondrial Imaging Research and Diagnostics, Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | - Adam Bartok
- MitoCare Center for Mitochondrial Imaging Research and Diagnostics, Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | - Thomas Wisniewski
- Departments of Neurology, Pathology and Psychiatry, Center for Cognitive Neurology, NYU School of Medicine, New York, NY 10016, USA
| | - Drew R Jones
- NYU School of Medicine, Metabolomics Core Resource Laboratory at NYU Langone Health, 550 First Avenue, New York, NY 10016, USA
| | - Sonia Do Carmo
- Department of Pharmacology and Therapeutics, McGill University, McIntyre Medical Building 3655 Prom. Sir-William-Osler, Montreal, QC H3G 1Y6, Canada
| | - Eduardo M Castaño
- Laboratory of Brain Aging and Neurodegeneration, Fundación Instituto Leloir, IIBBA-CONICET, Av. Patricias Argentinas 435, C1405BWE Ciudad Autónoma de Buenos Aires, Argentina
| | - A Claudio Cuello
- Department of Pharmacology and Therapeutics, McGill University, McIntyre Medical Building 3655 Prom. Sir-William-Osler, Montreal, QC H3G 1Y6, Canada
| | - György Hajnóczky
- MitoCare Center for Mitochondrial Imaging Research and Diagnostics, Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | - Laura Morelli
- Laboratory of Brain Aging and Neurodegeneration, Fundación Instituto Leloir, IIBBA-CONICET, Av. Patricias Argentinas 435, C1405BWE Ciudad Autónoma de Buenos Aires, Argentina
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227
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Abdrakhmanov A, Kulikov AV, Luchkina EA, Zhivotovsky B, Gogvadze V. Involvement of mitophagy in cisplatin-induced cell death regulation. Biol Chem 2019; 400:161-170. [PMID: 29924729 DOI: 10.1515/hsz-2018-0210] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 06/14/2018] [Indexed: 01/05/2023]
Abstract
Mitophagy, the selective degradation of mitochondria via the autophagic pathway, is a vital mechanism of mitochondrial quality control in cells. The removal of malfunctioning or damaged mitochondria is essential for normal cellular physiology and tissue development. Stimulation of mitochondrial permeabilization and release of proapoptotic factors from the intermembrane space is an essential step in triggering the mitochondrial pathway of cell death. In this study, we analyzed the extent to which mitophagy interferes with cell death, attenuating the efficiency of cancer therapy. We show that stimulation of mitophagy suppressed cisplatin-induced apoptosis, while mitophagy inhibition stimulates apoptosis and autophagy. Suppression of mitophagy involved production of reactive oxygen species, and the fate of cell was dependent on the interplay between endoplasmic reticulum stress and autophagy.
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Affiliation(s)
| | | | | | - Boris Zhivotovsky
- MV Lomonosov Moscow State University, 119991 Moscow, Russia.,Institute of Environmental Medicine, Division of Toxicology, Karolinska Institutet, Box 210, SE-171 77 Stockholm, Sweden
| | - Vladimir Gogvadze
- MV Lomonosov Moscow State University, 119991 Moscow, Russia.,Institute of Environmental Medicine, Division of Toxicology, Karolinska Institutet, Box 210, SE-171 77 Stockholm, Sweden
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228
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Singh-Mallah G, Nair S, Sandberg M, Mallard C, Hagberg H. The Role of Mitochondrial and Endoplasmic Reticulum Reactive Oxygen Species Production in Models of Perinatal Brain Injury. Antioxid Redox Signal 2019; 31:643-663. [PMID: 30957515 PMCID: PMC6657303 DOI: 10.1089/ars.2019.7779] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 04/01/2019] [Accepted: 04/03/2019] [Indexed: 12/20/2022]
Abstract
Significance: Perinatal brain injury is caused by hypoxia-ischemia (HI) in term neonates, perinatal arterial stroke, and infection/inflammation leading to devastating long-term neurodevelopmental deficits. Therapeutic hypothermia is the only currently available treatment but is not successful in more than 50% of term neonates suffering from hypoxic-ischemic encephalopathy. Thus, there is an urgent unmet need for alternative or adjunct therapies. Reactive oxygen species (ROS) are important for physiological signaling, however, their overproduction/accumulation from mitochondria and endoplasmic reticulum (ER) during HI aggravate cell death. Recent Advances and Critical Issues: Mechanisms underlying ER stress-associated ROS production have been primarily elucidated using either non-neuronal cells or adult neurodegenerative experimental models. Findings from mature brain cannot be simply transferred to the immature brain. Therefore, age-specific studies investigating ER stress modulators may help investigate ER stress-associated ROS pathways in the immature brain. New therapeutics such as mitochondrial site-specific ROS inhibitors that selectively inhibit superoxide (O2•-)/hydrogen peroxide (H2O2) production are currently being developed. Future Directions: Because ER stress and oxidative stress accentuate each other, a combinatorial therapy utilizing both antioxidants and ER stress inhibitors may prove to be more protective against perinatal brain injury. Moreover, multiple relevant targets need to be identified for targeting ROS before they are formed. The role of organelle-specific ROS in brain repair needs investigation. Antioxid. Redox Signal. 31, 643-663.
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Affiliation(s)
- Gagandeep Singh-Mallah
- Institute of Biomedicine, Department of Medical Biochemistry, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Centre of Perinatal Medicine and Health, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Syam Nair
- Centre of Perinatal Medicine and Health, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Institute of Neuroscience and Physiology, Department of Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Institute of Clinical Sciences, Department of Obstetrics and Gynecology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Mats Sandberg
- Institute of Biomedicine, Department of Medical Biochemistry, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Centre of Perinatal Medicine and Health, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Carina Mallard
- Centre of Perinatal Medicine and Health, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Institute of Neuroscience and Physiology, Department of Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Henrik Hagberg
- Centre of Perinatal Medicine and Health, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Institute of Clinical Sciences, Department of Obstetrics and Gynecology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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229
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Fisher JJ, Bartho LA, Perkins AV, Holland OJ. Placental mitochondria and reactive oxygen species in the physiology and pathophysiology of pregnancy. Clin Exp Pharmacol Physiol 2019; 47:176-184. [PMID: 31469913 DOI: 10.1111/1440-1681.13172] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 08/22/2019] [Accepted: 08/27/2019] [Indexed: 12/13/2022]
Abstract
Mitochondria are central to cell function. The placenta forms the interface between maternal and fetal systems, and placental mitochondria have critical roles in maintaining pregnancy. The placenta is unusual in having two adjacent cell layers (cytotrophoblasts and the syncytiotrophoblast) with vastly different mitochondria that have distinct functions in health and disease. Mitochondria both produce the majority of reactive oxygen species (ROS), and are sensitive to ROS. ROS are important in allowing cells to sense their environment through mitochondrial-centred signalling, and this signalling also helps cells/tissues adapt to changing environments. However, excessive ROS are damaging, and increased ROS levels are associated with pregnancy complications, including the important disorders preeclampsia and gestational diabetes mellitus. Here we review the function of placental mitochondria in healthy pregnancy, and also in pregnancy complications. Placental mitochondria are critical to cell function, and mitochondrial damage is a feature of pregnancy complications. However, the responsiveness of mitochondria to ROS signalling may be central to placental adaptations that mitigate damage, and placental mitochondria are an attractive target for the development of therapeutics to improve pregnancy outcomes.
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Affiliation(s)
- Joshua J Fisher
- School of Medical Science, Griffith University, Gold Coast Campus, Southport, Queensland, Australia
| | - Lucy A Bartho
- School of Medical Science, Griffith University, Gold Coast Campus, Southport, Queensland, Australia
| | - Anthony V Perkins
- School of Medical Science, Griffith University, Gold Coast Campus, Southport, Queensland, Australia
| | - Olivia J Holland
- School of Medical Science, Griffith University, Gold Coast Campus, Southport, Queensland, Australia
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230
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Mechanistic Connections between Endoplasmic Reticulum (ER) Redox Control and Mitochondrial Metabolism. Cells 2019; 8:cells8091071. [PMID: 31547228 PMCID: PMC6769559 DOI: 10.3390/cells8091071] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 09/06/2019] [Accepted: 09/07/2019] [Indexed: 12/21/2022] Open
Abstract
The past decade has seen the emergence of endoplasmic reticulum (ER) chaperones as key determinants of contact formation between mitochondria and the ER on the mitochondria-associated membrane (MAM). Despite the known roles of ER–mitochondria tethering factors like PACS-2 and mitofusin-2, it is not yet entirely clear how they mechanistically interact with the ER environment to determine mitochondrial metabolism. In this article, we review the mechanisms used to communicate ER redox and folding conditions to the mitochondria, presumably with the goal of controlling mitochondrial metabolism at the Krebs cycle and at the electron transport chain, leading to oxidative phosphorylation (OXPHOS). To achieve this goal, redox nanodomains in the ER and the interorganellar cleft influence the activities of ER chaperones and Ca2+-handling proteins to signal to mitochondria. This mechanism, based on ER chaperones like calnexin and ER oxidoreductases like Ero1α, controls reactive oxygen production within the ER, which can chemically modify the proteins controlling ER–mitochondria tethering, or mitochondrial membrane dynamics. It can also lead to the expression of apoptotic or metabolic transcription factors. The link between mitochondrial metabolism and ER homeostasis is evident from the specific functions of mitochondria–ER contact site (MERC)-localized Ire1 and PERK. These functions allow these two transmembrane proteins to act as mitochondria-preserving guardians, a function that is apparently unrelated to their functions in the unfolded protein response (UPR). In scenarios where ER stress cannot be resolved via the activation of mitochondrial OXPHOS, MAM-localized autophagosome formation acts to remove defective portions of the ER. ER chaperones such as calnexin are again critical regulators of this MERC readout.
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231
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Yong J, Bischof H, Burgstaller S, Siirin M, Murphy A, Malli R, Kaufman RJ. Mitochondria supply ATP to the ER through a mechanism antagonized by cytosolic Ca 2. eLife 2019; 8:49682. [PMID: 31498082 PMCID: PMC6763289 DOI: 10.7554/elife.49682] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Accepted: 09/09/2019] [Indexed: 12/15/2022] Open
Abstract
The endoplasmic reticulum (ER) imports ATP and uses energy from ATP hydrolysis for protein folding and trafficking. However, little is known about how this vital ATP transport occurs across the ER membrane. Here, using three commonly used cell lines (CHO, INS1 and HeLa), we report that ATP enters the ER lumen through a cytosolic Ca2+-antagonized mechanism, or CaATiER (Ca2+-Antagonized Transport into ER). Significantly, we show that mitochondria supply ATP to the ER and a SERCA-dependent Ca2+ gradient across the ER membrane is necessary for ATP transport into the ER, through SLC35B1/AXER. We propose that under physiological conditions, increases in cytosolic Ca2+ inhibit ATP import into the ER lumen to limit ER ATP consumption. Furthermore, the ATP level in the ER is readily depleted by oxidative phosphorylation (OxPhos) inhibitors and that ER protein misfolding increases ATP uptake from mitochondria into the ER. These findings suggest that ATP usage in the ER may increase mitochondrial OxPhos while decreasing glycolysis, i.e. an ‘anti-Warburg’ effect.
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Affiliation(s)
- Jing Yong
- Degenerative Diseases Program, SBP Medical Discovery Institute, La Jolla, United States
| | - Helmut Bischof
- Molecular Biology and Biochemistry, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | - Sandra Burgstaller
- Molecular Biology and Biochemistry, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | - Marina Siirin
- Degenerative Diseases Program, SBP Medical Discovery Institute, La Jolla, United States
| | - Anne Murphy
- Department of Pharmacology, University of California, San Diego, La Jolla, United States
| | - Roland Malli
- Molecular Biology and Biochemistry, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | - Randal J Kaufman
- Degenerative Diseases Program, SBP Medical Discovery Institute, La Jolla, United States.,Department of Pharmacology, University of California, San Diego, La Jolla, United States
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232
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Dingreville F, Panthu B, Thivolet C, Ducreux S, Gouriou Y, Pesenti S, Chauvin MA, Chikh K, Errazuriz-Cerda E, Van Coppenolle F, Rieusset J, Madec AM. Differential Effect of Glucose on ER-Mitochondria Ca 2+ Exchange Participates in Insulin Secretion and Glucotoxicity-Mediated Dysfunction of β-Cells. Diabetes 2019; 68:1778-1794. [PMID: 31175102 DOI: 10.2337/db18-1112] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 06/04/2019] [Indexed: 11/13/2022]
Abstract
Glucotoxicity-induced β-cell dysfunction in type 2 diabetes is associated with alterations of mitochondria and the endoplasmic reticulum (ER). Both organelles interact at contact sites, defined as mitochondria-associated membranes (MAMs), which were recently implicated in the regulation of glucose homeostasis. The role of MAMs in β-cells is still largely unknown, and their implication in glucotoxicity-associated β-cell dysfunction remains to be defined. Here, we report that acute glucose treatment stimulated ER-mitochondria interactions and calcium (Ca2+) exchange in INS-1E cells, whereas disruption of MAMs altered glucose-stimulated insulin secretion (GSIS). Conversely, chronic incubations with high glucose of either INS-1E cells or human pancreatic islets altered GSIS and concomitantly reduced ER Ca2+ store, increased basal mitochondrial Ca2+, and reduced ATP-stimulated ER-mitochondria Ca2+ exchanges, despite an increase of organelle interactions. Furthermore, glucotoxicity-induced perturbations of Ca2+ signaling are associated with ER stress, altered mitochondrial respiration, and mitochondria fragmentation, and these organelle stresses may participate in increased organelle tethering as a protective mechanism. Last, sustained induction of ER-mitochondria interactions using a linker reduced organelle Ca2+ exchange, induced mitochondrial fission, and altered GSIS. Therefore, dynamic organelle coupling participates in GSIS in β-cells, and over time, disruption of organelle Ca2+ exchange might be a novel mechanism contributing to glucotoxicity-induced β-cell dysfunction.
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Affiliation(s)
- Florian Dingreville
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
| | - Baptiste Panthu
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
| | - Charles Thivolet
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
- Department of Endocrinology and Diabetes, Hospices Civils de Lyon, Hopital Lyon Sud, Pierre-Bénite, France
| | - Sylvie Ducreux
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
| | - Yves Gouriou
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
| | - Sandra Pesenti
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
| | - Marie-Agnès Chauvin
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
| | - Karim Chikh
- Department of Endocrinology and Diabetes, Hospices Civils de Lyon, Hopital Lyon Sud, Pierre-Bénite, France
| | | | - Fabien Van Coppenolle
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
| | - Jennifer Rieusset
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
| | - Anne-Marie Madec
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
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233
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Gordaliza‐Alaguero I, Cantó C, Zorzano A. Metabolic implications of organelle-mitochondria communication. EMBO Rep 2019; 20:e47928. [PMID: 31418169 PMCID: PMC6726909 DOI: 10.15252/embr.201947928] [Citation(s) in RCA: 107] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 05/10/2019] [Accepted: 05/28/2019] [Indexed: 12/31/2022] Open
Abstract
Cellular organelles are not static but show dynamism-a property that is likely relevant for their function. In addition, they interact with other organelles in a highly dynamic manner. In this review, we analyze the proteins involved in the interaction between mitochondria and other cellular organelles, especially the endoplasmic reticulum, lipid droplets, and lysosomes. Recent results indicate that, on one hand, metabolic alterations perturb the interaction between mitochondria and other organelles, and, on the other hand, that deficiency in proteins involved in the tethering between mitochondria and the ER or in specific functions of the interaction leads to metabolic alterations in a variety of tissues. The interaction between organelles is an emerging field that will permit to identify key proteins, to delineate novel modulation pathways, and to elucidate their implications in human disease.
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Affiliation(s)
- Isabel Gordaliza‐Alaguero
- Institute for Research in Biomedicine (IRB Barcelona)Barcelona Institute of Science and Technology (BIST)BarcelonaSpain
- CIBER de Diabetes y Enfermedades Metabolicas AsociadasBarcelonaSpain
- Departamento de Bioquimica i Biomedicina MolecularFacultat de BiologiaUniversitat de BarcelonaBarcelonaSpain
| | - Carlos Cantó
- Nestle Institute of Health Sciences (NIHS)LausanneSwitzerland
- School of Life SciencesEcole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Antonio Zorzano
- Institute for Research in Biomedicine (IRB Barcelona)Barcelona Institute of Science and Technology (BIST)BarcelonaSpain
- CIBER de Diabetes y Enfermedades Metabolicas AsociadasBarcelonaSpain
- Departamento de Bioquimica i Biomedicina MolecularFacultat de BiologiaUniversitat de BarcelonaBarcelonaSpain
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234
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Betulinic Acid Suppresses Breast Cancer Metastasis by Targeting GRP78-Mediated Glycolysis and ER Stress Apoptotic Pathway. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:8781690. [PMID: 31531187 PMCID: PMC6721262 DOI: 10.1155/2019/8781690] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 07/26/2019] [Indexed: 12/26/2022]
Abstract
Targeting aberrant metabolism is a promising strategy for inhibiting cancer growth and metastasis. Research is now geared towards investigating the inhibition of glycolysis for anticancer drug development. Betulinic acid (BA) has demonstrated potent anticancer activities in multiple malignancies. However, its regulatory effects on glycolysis and the underlying molecular mechanisms are still unclear. BA inhibited invasion and migration of highly aggressive breast cancer cells. Moreover, BA could suppress aerobic glycolysis of breast cancer cells presenting as a reduction of lactate production, quiescent energy phenotype transition, and downregulation of aerobic glycolysis-related proteins. In this study, glucose-regulated protein 78 (GRP78) was also identified as the molecular target of BA in inhibiting aerobic glycolysis. BA treatment led to GRP78 overexpression, and GRP78 knockdown abrogated the inhibitory effect of BA on glycolysis. Further studies demonstrated that overexpressed GRP78 activated the endoplasmic reticulum (ER) stress sensor PERK. Subsequent phosphorylation of eIF2α led to the inhibition of β-catenin expression, which resulted in the inhibition of c-Myc-mediated glycolysis. Coimmunoprecipitation assay revealed that BA interrupted the binding between GRP78 and PERK, thereby initiating the glycolysis inhibition cascade. Finally, the lung colonization model validated that BA inhibited breast cancer metastasis in vivo, as well as suppressed the expression of aerobic glycolysis-related proteins. In conclusion, our study not only provided a promising drug for aerobic glycolysis inhibition but also revealed that GRP78 is a novel molecular link between glycolytic metabolism and ER stress during tumor metastasis.
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235
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Lan B, He Y, Sun H, Zheng X, Gao Y, Li N. The roles of mitochondria-associated membranes in mitochondrial quality control under endoplasmic reticulum stress. Life Sci 2019; 231:116587. [PMID: 31220526 DOI: 10.1016/j.lfs.2019.116587] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Revised: 05/28/2019] [Accepted: 06/17/2019] [Indexed: 02/06/2023]
Abstract
The endoplasmic reticulum (ER) and mitochondria are two important organelles in cells. Mitochondria-associated membranes (MAMs) are lipid raft-like domains formed in the ER membranes that are in close apposition to mitochondria. They play an important role in signal transmission between these two essential organelles. When cells are exposed to internal or external stressful stimuli, the ER will activate an adaptive response called the ER stress response, which has a significant effect on mitochondrial function. Mitochondrial quality control is an important mechanism to ensure the functional integrity of mitochondria and the effect of ER stress on mitochondrial quality control through MAMs is of great significance. Therefore, in this review, we introduce ER stress and mitochondrial quality control, and discuss how ER stress signals are transmitted to mitochondria through MAMs. We then review the important roles of MAMs in mitochondrial quality control under ER stress.
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Affiliation(s)
- Beiwu Lan
- Department of Neurosurgery, China-Japan Union Hospital, Jilin University, Changchun, Jilin, China
| | - Yichun He
- Department of Neurosurgery, China-Japan Union Hospital, Jilin University, Changchun, Jilin, China
| | - Hongyu Sun
- Department of Pathophysiology, Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, China
| | - Xinzi Zheng
- Department of Pathophysiology, Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, China
| | - Yufei Gao
- Department of Neurosurgery, China-Japan Union Hospital, Jilin University, Changchun, Jilin, China.
| | - Na Li
- Department of Pathophysiology, Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, China.
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236
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Puri R, Cheng XT, Lin MY, Huang N, Sheng ZH. Mul1 restrains Parkin-mediated mitophagy in mature neurons by maintaining ER-mitochondrial contacts. Nat Commun 2019; 10:3645. [PMID: 31409786 PMCID: PMC6692330 DOI: 10.1038/s41467-019-11636-5] [Citation(s) in RCA: 109] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 07/27/2019] [Indexed: 12/19/2022] Open
Abstract
Chronic mitochondrial stress associates with major neurodegenerative diseases. Recovering stressed mitochondria constitutes a critical step of mitochondrial quality control and thus energy maintenance in early stages of neurodegeneration. Here, we reveal Mul1-Mfn2 pathway that maintains neuronal mitochondrial integrity under stress conditions. Mul1 deficiency increases Mfn2 activity that triggers the first phasic mitochondrial hyperfusion and also acts as an ER-Mito tethering antagonist. Reduced ER-Mito coupling leads to increased cytoplasmic Ca2+ load that activates calcineurin and induces the second phasic Drp1-dependent mitochondrial fragmentation and mitophagy. Overexpressing Mfn2, but not Mfn1, mimics Mul1-deficient phenotypes, while expressing PTPIP51, an ER-Mito anchoring protein, suppresses Parkin-mediated mitophagy. Thus, by regulating mitochondrial morphology and ER-Mito contacts, Mul1-Mfn2 pathway plays an early checkpoint role in maintaining mitochondrial integrity. Our study provides new mechanistic insights into neuronal mitochondrial maintenance under stress conditions, which is relevant to several major neurodegenerative diseases associated with mitochondrial dysfunction and altered ER-Mito interplay. Little is known about the pathways that maintain mitochondrial structure and function under neuronal stress conditions. Here, authors demonstrate that the Mul1-Mfn2 pathway plays a checkpoint role in maintaining mitochondrial integrity and energy maintenance by ensuring ER-mitochondrial tethering and preventing mitophagy.
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Affiliation(s)
- Rajat Puri
- Synaptic Function Section, The Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Room 2B-215, 35 Convent Drive, Bethesda, MD, 20892-3706, USA
| | - Xiu-Tang Cheng
- Synaptic Function Section, The Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Room 2B-215, 35 Convent Drive, Bethesda, MD, 20892-3706, USA
| | - Mei-Yao Lin
- Synaptic Function Section, The Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Room 2B-215, 35 Convent Drive, Bethesda, MD, 20892-3706, USA
| | - Ning Huang
- Synaptic Function Section, The Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Room 2B-215, 35 Convent Drive, Bethesda, MD, 20892-3706, USA
| | - Zu-Hang Sheng
- Synaptic Function Section, The Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Room 2B-215, 35 Convent Drive, Bethesda, MD, 20892-3706, USA.
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237
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Aguilar Cosme JR, Bryant HE, Claeyssens F. Carbon dot-protoporphyrin IX conjugates for improved drug delivery and bioimaging. PLoS One 2019; 14:e0220210. [PMID: 31344086 PMCID: PMC6657888 DOI: 10.1371/journal.pone.0220210] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Accepted: 07/10/2019] [Indexed: 12/27/2022] Open
Abstract
Photodynamic therapy (PDT) uses photosensitisers such as protoporphyrin IX (PpIX) to target tumours via the release of toxic singlet oxygen when irradiated. The effectivity of the treatment is limited by the innate properties of the photosensitizers; they typically exhibit inefficient accumulation in target tissue and high dark toxicity. Carbon dots (CDs) are biocompatible fluorescent nanoparticles which can improve PpIX cellular uptake and solubility. In this work, we present conjugates synthesised by host-guest encapsulation (PpIX@CD) and amide cross-linking (PpIX-CD). Characterization demonstrated conjugates have a loading efficiency of 34-48% and similar singlet oxygen production to PpIX. PpIX-containing CDs showed a 2.2 to 3.7-fold decrease in dark toxicity. PpIX-CD and PpIX@CD showed equivalent light-induced toxicity to PpIX in concentrations >1 μg/ml, leading to a 3.2 to 4.1-fold increase in photo-toxicity index (PI). The less soluble fraction of cross-linked conjugates (PpIX-CD)p did not show significant difference from PpIX. Confocal light scanning microscopy demonstrated rapid intracellular uptake and accumulation of conjugates. Our results demonstrate the variations between cross-linking strategies in CD-based conjugates, highlighting their potential as carriers in drug delivery and bioimaging applications.
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Affiliation(s)
- Jose R. Aguilar Cosme
- Department of Materials Science and Engineering, Kroto Research Institute, University of Sheffield, Sheffield, United Kingdom
| | - Helen E. Bryant
- Department of Oncology & Metabolism, The Medical School, University of Sheffield, Sheffield, United Kingdom
| | - Frederik Claeyssens
- Department of Materials Science and Engineering, Kroto Research Institute, University of Sheffield, Sheffield, United Kingdom
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238
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Morais Mewes J, Rodrigues Silva Gasparin F, Yoshida T, Amâncio Daniel da Silva M, Raquel Marçal Natali M, Francisco Veiga Bizerra P, Sayuri Utsunomiya K, Hideo Gilglioni E, Shigueaki Mito M, Cristiane Mantovanelli G, Thais Lima de Souza B, Makiyama Klosowski E, Luiza Ishii-Iwamoto E, Constantin J, Polimeni Constantin R. The Role of Mitochondria in Sex-Dependent Differences in Hepatic Steatosis and Oxidative Stress in Response to Cafeteria Diet-Induced Obesity in Mice. Nutrients 2019; 11:E1618. [PMID: 31315289 PMCID: PMC6682896 DOI: 10.3390/nu11071618] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 06/03/2019] [Accepted: 07/11/2019] [Indexed: 12/30/2022] Open
Abstract
Female mice fed a cafeteria diet (FCaf) develop higher liver steatosis and oxidative stress than males (MCaf) as a consequence of unresolved ER stress. Here, we investigated whether mitochondria play a role in this sex difference. The isolated mitochondria from FCaf showed more signs of oxidative stress than those of MCaf, correlated with a reduced content of GSH, increased amount of reactive oxygen species (ROS), and lower activities of enzymes involved in ROS neutralisation. Mitochondria from FCaf and MCaf livers exhibited lower rates of succinate-driven state III respiration and reduced ATPase activity in intact coupled mitochondria compared to their controls fed a standard diet (FC and MC), with no differences between the sexes. Fatty acid oxidation in mitochondria and peroxisomes was higher in MCaf and FCaf compared to their respective controls. In the intact perfused liver, there was no difference between sex or diet regarding the fatty acid oxidation rate. These results indicated that cafeteria diet did not affect mitochondrial energy metabolism, even in FCaf livers, which have higher steatosis and cellular oxidative stress. Nevertheless, the increase in mitochondrial ROS generation associated with a decrease in the antioxidant defence capacity, probably contributes to inducing or reinforcing the ER stress in FCaf livers.
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Affiliation(s)
- Juliana Morais Mewes
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá 87020-900, Paraná, Brazil
| | - Fabiana Rodrigues Silva Gasparin
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá 87020-900, Paraná, Brazil
| | - Tiago Yoshida
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá 87020-900, Paraná, Brazil
| | - Mariana Amâncio Daniel da Silva
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá 87020-900, Paraná, Brazil
| | - Maria Raquel Marçal Natali
- Department of Morphophysiological Sciences, State University of Maringá, Maringá 87020-900, Paraná, Brazil
| | - Paulo Francisco Veiga Bizerra
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá 87020-900, Paraná, Brazil
| | - Karina Sayuri Utsunomiya
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá 87020-900, Paraná, Brazil
| | - Eduardo Hideo Gilglioni
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá 87020-900, Paraná, Brazil
| | - Marcio Shigueaki Mito
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá 87020-900, Paraná, Brazil
| | - Gislaine Cristiane Mantovanelli
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá 87020-900, Paraná, Brazil
| | - Byanca Thais Lima de Souza
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá 87020-900, Paraná, Brazil
| | - Eduardo Makiyama Klosowski
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá 87020-900, Paraná, Brazil
| | - Emy Luiza Ishii-Iwamoto
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá 87020-900, Paraná, Brazil
| | - Jorgete Constantin
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá 87020-900, Paraná, Brazil
| | - Rodrigo Polimeni Constantin
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá 87020-900, Paraná, Brazil.
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Zito E. Targeting ER stress/ER stress response in myopathies. Redox Biol 2019; 26:101232. [PMID: 31181458 PMCID: PMC6556854 DOI: 10.1016/j.redox.2019.101232] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 05/14/2019] [Accepted: 05/30/2019] [Indexed: 12/14/2022] Open
Abstract
There is more skeletal muscle tissue in the body than any other tissue and, as it is the organ of the majority of metabolic activity, muscle defect can affect the health of the entire body. Endoplasmic reticulum (ER) stress due to defects in protein folding/degradation balance, altered calcium and lipid levels and alterations in ER-mitochondria contacts has recently been recognised as the pathogenic cause of many different myopathies. In addition, a maladaptive ER stress response triggered by ER stress and mediated by three ER stress sensors (PERK, IRE1 and ATF6) is involved in a failure to relieve muscle tissue from this stress. Targeting ER stress and the ER stress response pathway offers a broad range of opportunities for treating myopathies but, as the inhibition of the three ER stress sensors may not be safe because it could lead to unexpected effects; it therefore calls for careful analysis of the changes in downstream signal transduction in the different myopathies so these sub-pathways can be pharmacologically targeted. This review summarises the known inhibitors of the ER stress response and the successful results obtained using some of them in mouse models of muscle diseases caused by ER stress/ER stress response. ER stress and the ER stress response are pathogenic causes of myopathies. Pre-clinical models improve our understanding of the safest branch or sub-branch of the ER stress response to inhibit. The inhibitors of signalling downstream of the three ER stress sensors is the safest pharmacological option. Chemical chaperones are promising pharmacological means of treating myopathies.
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Affiliation(s)
- Ester Zito
- Dulbecco Telethon Institute at IRCCS-Istituto di Ricerche Farmacologiche Mario Negri, Milan, Italy.
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240
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Rimessi A, Pedriali G, Vezzani B, Tarocco A, Marchi S, Wieckowski MR, Giorgi C, Pinton P. Interorganellar calcium signaling in the regulation of cell metabolism: A cancer perspective. Semin Cell Dev Biol 2019; 98:167-180. [PMID: 31108186 DOI: 10.1016/j.semcdb.2019.05.015] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 05/13/2019] [Accepted: 05/14/2019] [Indexed: 01/22/2023]
Abstract
Organelles were originally considered to be individual cellular compartments with a defined organization and function. However, recent studies revealed that organelles deeply communicate within each other via Ca2+ exchange. This communication, mediated by specialized membrane regions in close apposition between two organelles, regulate cellular functions, including metabolism and cell fate decisions. Advances in microscopy techniques, molecular biology and biochemistry have increased our understanding of these interorganelle platforms. Research findings suggest that interorganellar Ca2+ signaling, which is altered in cancer, influences tumorigenesis and tumor progression by controlling cell death programs and metabolism. Here, we summarize the available data on the existence and composition of interorganelle platforms connecting the endoplasmic reticulum with mitochondria, the plasma membrane, or endolysosomes. Finally, we provide a timely overview of the potential function of interorganellar Ca2+ signaling in maintaining cellular homeostasis.
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Affiliation(s)
- Alessandro Rimessi
- Dept. of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy.
| | - Gaia Pedriali
- Dept. of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy
| | - Bianca Vezzani
- Dept. of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy
| | - Anna Tarocco
- Dept. of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy; Neonatal Intensive Care Unit, University Hospital S. Anna Ferrara, 44124 Ferrara, Italy
| | - Saverio Marchi
- Dept. of Clinical and Molecular Sciences, Polytechnical University of Marche, 60126 Ancona, Italy
| | | | - Carlotta Giorgi
- Dept. of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy
| | - Paolo Pinton
- Dept. of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy; Maria Cecilia Hospital, GVM Care & Research, 48033 Cotignola, Ravenna, Italy.
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241
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Non-canonical function of IRE1α determines mitochondria-associated endoplasmic reticulum composition to control calcium transfer and bioenergetics. Nat Cell Biol 2019; 21:755-767. [PMID: 31110288 DOI: 10.1038/s41556-019-0329-y] [Citation(s) in RCA: 203] [Impact Index Per Article: 33.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 04/09/2019] [Indexed: 12/14/2022]
Abstract
Mitochondria-associated membranes (MAMs) are central microdomains that fine-tune bioenergetics by the local transfer of calcium from the endoplasmic reticulum to the mitochondrial matrix. Here, we report an unexpected function of the endoplasmic reticulum stress transducer IRE1α as a structural determinant of MAMs that controls mitochondrial calcium uptake. IRE1α deficiency resulted in marked alterations in mitochondrial physiology and energy metabolism under resting conditions. IRE1α determined the distribution of inositol-1,4,5-trisphosphate receptors at MAMs by operating as a scaffold. Using mutagenesis analysis, we separated the housekeeping activity of IRE1α at MAMs from its canonical role in the unfolded protein response. These observations were validated in vivo in the liver of IRE1α conditional knockout mice, revealing broad implications for cellular metabolism. Our results support an alternative function of IRE1α in orchestrating the communication between the endoplasmic reticulum and mitochondria to sustain bioenergetics.
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242
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Yang M, Zhao L, Gao P, Zhu X, Han Y, Chen X, Li L, Xiao Y, Wei L, Li C, Xiao L, Yuan S, Liu F, Dong LQ, Kanwar YS, Sun L. DsbA-L ameliorates high glucose induced tubular damage through maintaining MAM integrity. EBioMedicine 2019; 43:607-619. [PMID: 31060900 PMCID: PMC6558222 DOI: 10.1016/j.ebiom.2019.04.044] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 04/07/2019] [Accepted: 04/23/2019] [Indexed: 12/17/2022] Open
Abstract
Background The mitochondrial associated endoplasmic reticulum (ER) membrane (MAM) provides a platform for communication between the mitochondria and ER, and it plays a vital role in many biological functions. Disulphide-bond A oxidoreductase-like protein (DsbA-L), expressed in the MAM, serves as an antioxidant and reduces ER stress. However, the role of DsbA-L and MAM in kidney pathobiology remains unclear. Methods Molecular biology techniques, transmission electron microscopy (TEM), in situ proximity ligation assays (PLAs), confocal microscopy, TUNEL staining and flow cytometry were utilized to analyse apoptosis and status of MAM in DsbA-L mutant mice. Findings We showed that MAM was significantly reduced in the kidneys of streptozotocin-induced diabetic mice, which correlated with the extent of renal injury. We also observed a correlation between the loss of MAM integrity and increased apoptosis and renal injury in diabetic nephropathy (DN). These alterations were further exacerbated in diabetic DsbA-L gene-deficient mice (DsbA-L−/−). In vitro, overexpression of DsbA-L in HK-2 cells restored MAM integrity and reduced apoptosis induced by high-glucose ambience. These beneficial effects were partially blocked by overexpression of FATE-1, a MAM uncoupling protein. Finally, the expression of DsbA-L was positively correlated with MAM integrity in the kidneys of DN patients but negatively correlated with apoptosis and renal injury. Interpretation Our results indicate that DsbA-L exerts an antiapoptotic effect by maintaining MAM integrity, which is apparently disrupted in DN. Fund This work was supported by the National Natural Science Foundation of China (81730018), the National Key R&D Program of China (2016YFC1305501) and NIH (DK60635).
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Affiliation(s)
- Ming Yang
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Li Zhao
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China; Department of Pulmonary and Critical Care Medicine, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Peng Gao
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Xuejing Zhu
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Yachun Han
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Xianghui Chen
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Li Li
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Ying Xiao
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Ling Wei
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Chenrui Li
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Li Xiao
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Shuguang Yuan
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Fuyou Liu
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Lily Q Dong
- Department of Cell Systems & Anatomy, University of Texas Health at San Antonio, San Antonio, TX 78229, USA
| | - Yashpal S Kanwar
- Departments of Pathology & Medicine, Northwestern University, Chicago, IL, USA
| | - Lin Sun
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China.
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Inhibition of Mitofusin-2 Promotes Cardiac Fibroblast Activation via the PERK/ATF4 Pathway and Reactive Oxygen Species. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:3649808. [PMID: 31178957 PMCID: PMC6501253 DOI: 10.1155/2019/3649808] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Accepted: 12/06/2018] [Indexed: 02/05/2023]
Abstract
Mitofusin-2 (Mfn2) is a key outer mitochondrial membrane protein, which maintains normal mitochondrial dynamics and function. However, its role in cardiac fibroblast activation remains poorly understood. In the present study, a rat model of transverse aortic constriction (TAC) was established to observe the cardiac fibroblast activation in vivo. TGF-β1 treatment for 24 hours was used to induce cardiac fibroblast activation in vitro. As a result, the expression of Mfn2 decreased in the hypertrophic heart tissues and cardiac fibroblasts treated with TGF-β1. siMfn2 and adenovirus were applied to mediate Mfn2 gene silencing and overexpression in cardiac fibroblasts to elucidate the relationship between Mfn2 and cardiac fibroblast activation, as well as the possible underlying mechanisms. Knockdown of Mfn2 further promoted TGF-β1-induced cardiac fibroblast activation, while forced expression of Mfn2 attenuated this pathological reaction. The PERK/ATF4 pathway, one of the branches of endoplasmic reticulum (ER) stress, was identified to be involved in this process. Knockdown and overexpression of Mfn2 lead to aggravation or alleviation of the PERK/ATF4 pathway. Blocking this pathway by silencing ATF4 with siATF4 attenuated the pathological process. During the activation of cardiac fibroblasts, knockdown of Mfn2 also increased the production of reactive oxygen species (ROS), while ROS scavenger N-acetyl-l-cysteine (NAC) could attenuate the effect caused by knockdown of Mfn2. Our data suggested that inhibition of Mfn2 could promote cardiac fibroblast activation by activating the PERK/ATF4 signaling pathway and increasing the generation of ROS.
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244
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Simões-Alves AC, Costa-Silva JH, Barros-Junior IB, da Silva Filho RC, Vasconcelos DAA, Vidal H, Morio B, Fernandes MP. Saturated Fatty Acid-Enriched Diet-Impaired Mitochondrial Bioenergetics in Liver From Undernourished Rats During Critical Periods of Development. Cells 2019; 8:E335. [PMID: 30974751 PMCID: PMC6523252 DOI: 10.3390/cells8040335] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2019] [Revised: 03/24/2019] [Accepted: 03/30/2019] [Indexed: 12/13/2022] Open
Abstract
The nutritional transition that the western population has undergone is increasingly associated with chronic metabolic diseases. In this work, we evaluated a diet rich in saturated fatty acids (hyperlipidic, HL) after weaning of the offspring rats submitted to maternal protein restriction on the hepatic mitochondrial bioenergetics. Wistar rats were mated and during gestation and lactation, mothers received control diets (NP, normal protein content 17%) or low protein (LP, 8% protein). After weaning, rats received either NL (normolipidic) or HL (+59% SFA) diets up to 90 days of life. It was verified that all respiratory states of hepatic mitochondria showed a reduction in the LP group submitted to the post-weaning HL diet. This group also presented greater mitochondrial swelling compared to controls, potentiated after Ca2+ addition and prevented in the presence of EGTA (calcium chelator) and cyclosporin A (mitochondrial permeability transition pore inhibitor). There was also an increase in liver protein oxidation and lipid peroxidation and reduction in catalase and glutathione peroxidase activities in the LP group fed HL diet after weaning. Our data suggest that adult rats subjected to maternal protein restriction were more susceptible to hepatic mitochondrial damage caused by a diet rich in saturated fatty acids post-weaning.
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Affiliation(s)
- Aiany C Simões-Alves
- Laboratory of Nutrition, Physical Activity and Phenotypic Plasticity, Federal University of Pernambuco-UFPE, Vitória de Santo Antão, PE 55608-680, Brazil.
- Laboratoire de Recherche en Cardiovasculaire, Métabolisme, Diabétologie et Nutrition (CarMeN), INSERM U1060, INRA U1397, Université Claude Bernard Lyon1, 69921 Oullins, France.
- Laboratory of General Biochemistry, Molecular Biology and Exercise, Federal University of Pernambuco-UFPE, Vitória de Santo Antão, PE 55608-680, Brazil.
| | - Joao H Costa-Silva
- Laboratory of Nutrition, Physical Activity and Phenotypic Plasticity, Federal University of Pernambuco-UFPE, Vitória de Santo Antão, PE 55608-680, Brazil.
- Laboratoire de Recherche en Cardiovasculaire, Métabolisme, Diabétologie et Nutrition (CarMeN), INSERM U1060, INRA U1397, Université Claude Bernard Lyon1, 69921 Oullins, France.
| | - Idelfonso B Barros-Junior
- Laboratory of General Biochemistry, Molecular Biology and Exercise, Federal University of Pernambuco-UFPE, Vitória de Santo Antão, PE 55608-680, Brazil.
| | - Reginaldo C da Silva Filho
- Laboratory of General Biochemistry, Molecular Biology and Exercise, Federal University of Pernambuco-UFPE, Vitória de Santo Antão, PE 55608-680, Brazil.
| | - Diogo A A Vasconcelos
- Laboratory of Nutrition, Physical Activity and Phenotypic Plasticity, Federal University of Pernambuco-UFPE, Vitória de Santo Antão, PE 55608-680, Brazil.
| | - Hubert Vidal
- Laboratoire de Recherche en Cardiovasculaire, Métabolisme, Diabétologie et Nutrition (CarMeN), INSERM U1060, INRA U1397, Université Claude Bernard Lyon1, 69921 Oullins, France.
| | - Béatrice Morio
- Laboratoire de Recherche en Cardiovasculaire, Métabolisme, Diabétologie et Nutrition (CarMeN), INSERM U1060, INRA U1397, Université Claude Bernard Lyon1, 69921 Oullins, France.
| | - Mariana P Fernandes
- Laboratory of General Biochemistry, Molecular Biology and Exercise, Federal University of Pernambuco-UFPE, Vitória de Santo Antão, PE 55608-680, Brazil.
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Increased Levels of cAMP by the Calcium-Dependent Activation of Soluble Adenylyl Cyclase in Parkin-Mutant Fibroblasts. Cells 2019; 8:cells8030250. [PMID: 30875974 PMCID: PMC6468892 DOI: 10.3390/cells8030250] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 03/06/2019] [Accepted: 03/11/2019] [Indexed: 02/06/2023] Open
Abstract
Almost half of autosomal recessive early-onset parkinsonism has been associated with mutations in PARK2, coding for parkin, which plays an important role in mitochondria function and calcium homeostasis. Cyclic adenosine monophosphate (cAMP) is a major second messenger regulating mitochondrial metabolism, and it is strictly interlocked with calcium homeostasis. Parkin-mutant (Pt) fibroblasts, exhibiting defective mitochondrial respiratory/OxPhos activity, showed a significant higher value of basal intracellular level of cAMP, as compared with normal fibroblasts (CTRL). Specific pharmacological inhibition/activation of members of the adenylyl cyclase- and of the phosphodiesterase-families, respectively, as well as quantitative reverse transcription polymerase chain reaction (RT-qPCR) analysis, indicate that the higher level of cAMP observed in Pt fibroblasts can contribute to a higher level of activity/expression by soluble adenylyl cyclase (sAC) and to low activity/expression of the phosphodiesterase isoform 4 (PDE4). As Ca2+ regulates sAC, we performed quantitative calcium-fluorimetric analysis, showing a higher level of Ca2+ in the both cytosol and mitochondria of Pt fibroblasts as compared with CTRL. Most notably, inhibition of the mitochondrial Ca2+ uniporter decreased, specifically the cAMP level in PD fibroblasts. All together, these findings support the occurrence of an altered mitochondrial Ca2+-mediated cAMP homeostasis in fibroblasts with the parkin mutation.
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246
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Thoudam T, Ha CM, Leem J, Chanda D, Park JS, Kim HJ, Jeon JH, Choi YK, Liangpunsakul S, Huh YH, Kwon TH, Park KG, Harris RA, Park KS, Rhee HW, Lee IK. PDK4 Augments ER-Mitochondria Contact to Dampen Skeletal Muscle Insulin Signaling During Obesity. Diabetes 2019; 68:571-586. [PMID: 30523025 PMCID: PMC6385748 DOI: 10.2337/db18-0363] [Citation(s) in RCA: 128] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 11/20/2018] [Indexed: 12/17/2022]
Abstract
Mitochondria-associated endoplasmic reticulum membrane (MAM) is a structural link between mitochondria and endoplasmic reticulum (ER). MAM regulates Ca2+ transport from the ER to mitochondria via an IP3R1-GRP75-VDAC1 complex-dependent mechanism. Excessive MAM formation may cause mitochondrial Ca2+ overload and mitochondrial dysfunction. However, the exact implication of MAM formation in metabolic syndromes remains debatable. Here, we demonstrate that PDK4 interacts with and stabilizes the IP3R1-GRP75-VDAC1 complex at the MAM interface. Obesity-induced increase in PDK4 activity augments MAM formation and suppresses insulin signaling. Conversely, PDK4 inhibition dampens MAM formation and improves insulin signaling by preventing MAM-induced mitochondrial Ca2+ accumulation, mitochondrial dysfunction, and ER stress. Furthermore, Pdk4-/- mice exhibit reduced MAM formation and are protected against diet-induced skeletal muscle insulin resistance. Finally, forced formation and stabilization of MAMs with synthetic ER-mitochondria linker prevented the beneficial effects of PDK4 deficiency on insulin signaling. Overall, our findings demonstrate a critical mediatory role of PDK4 in the development of skeletal muscle insulin resistance via enhancement of MAM formation.
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Affiliation(s)
- Themis Thoudam
- Department of Biomedical Science, The Graduate School, Kyungpook National University, Daegu, Republic of Korea
- BK21 Plus KNU Biomedical Convergence Program, Department of Biomedical Science, Kyungpook National University, Daegu, Republic of Korea
| | - Chae-Myeong Ha
- Department of Biomedical Science, The Graduate School, Kyungpook National University, Daegu, Republic of Korea
- BK21 Plus KNU Biomedical Convergence Program, Department of Biomedical Science, Kyungpook National University, Daegu, Republic of Korea
| | - Jaechan Leem
- Department of Immunology, School of Medicine, Catholic University of Daegu, Daegu, Republic of Korea
| | - Dipanjan Chanda
- Leading-Edge Research Center for Drug Discovery and Development for Diabetes and Metabolic Disease, Kyungpook National University Hospital, Daegu, Republic of Korea
| | - Jong-Seok Park
- Department of Chemistry, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea
| | - Hyo-Jeong Kim
- Electron Microscopy Research Center, Korea Basic Science Institute, Ochang, Chungbuk, Republic of Korea
| | - Jae-Han Jeon
- Leading-Edge Research Center for Drug Discovery and Development for Diabetes and Metabolic Disease, Kyungpook National University Hospital, Daegu, Republic of Korea
- Department of Internal Medicine, School of Medicine, Kyungpook National University, Kyungpook National University Hospital, Daegu, Republic of Korea
| | - Yeon-Kyung Choi
- Leading-Edge Research Center for Drug Discovery and Development for Diabetes and Metabolic Disease, Kyungpook National University Hospital, Daegu, Republic of Korea
- Department of Internal Medicine, School of Medicine, Kyungpook National University, Kyungpook National University Hospital, Daegu, Republic of Korea
| | - Suthat Liangpunsakul
- Division of Gastroenterology and Hepatology, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN
- Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN
- Richard L. Roudebush VA Medical Center, Indianapolis, IN
| | - Yang Hoon Huh
- Electron Microscopy Research Center, Korea Basic Science Institute, Ochang, Chungbuk, Republic of Korea
| | - Tae-Hwan Kwon
- Department of Biomedical Science, The Graduate School, Kyungpook National University, Daegu, Republic of Korea
- BK21 Plus KNU Biomedical Convergence Program, Department of Biomedical Science, Kyungpook National University, Daegu, Republic of Korea
| | - Keun-Gyu Park
- Leading-Edge Research Center for Drug Discovery and Development for Diabetes and Metabolic Disease, Kyungpook National University Hospital, Daegu, Republic of Korea
- Department of Internal Medicine, School of Medicine, Kyungpook National University, Kyungpook National University Hospital, Daegu, Republic of Korea
| | - Robert A Harris
- Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN
| | - Kyu-Sang Park
- Department of Physiology, Institute of Lifestyle Medicine, Yonsei University Wonju College of Medicine, Gangwon-Do, Republic of Korea
| | - Hyun-Woo Rhee
- Department of Chemistry, Seoul National University, Seoul, Republic of Korea
| | - In-Kyu Lee
- Leading-Edge Research Center for Drug Discovery and Development for Diabetes and Metabolic Disease, Kyungpook National University Hospital, Daegu, Republic of Korea
- Department of Internal Medicine, School of Medicine, Kyungpook National University, Kyungpook National University Hospital, Daegu, Republic of Korea
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Wang Q, Cai H, Hu Z, Wu Y, Guo X, Li J, Wang H, Liu Y, Liu Y, Xie L, Xu K, Xu H, He H, Zhang H, Xiao J. Loureirin B Promotes Axon Regeneration by Inhibiting Endoplasmic Reticulum Stress: Induced Mitochondrial Dysfunction and Regulating the Akt/GSK-3β Pathway after Spinal Cord Injury. J Neurotrauma 2019; 36:1949-1964. [PMID: 30543130 DOI: 10.1089/neu.2018.5966] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Axon retraction greatly limits functional recovery after spinal cord injury (SCI) and neuron polarization, which affects processes including axon formation and development, is a promising target for promoting axon regeneration. Increasing microtubule stability has been demonstrated to improve intrinsic axon regeneration processes and is critically related to endoplasmic reticulum (ER)-mitochondria interactions. We used real-time polymerase chain reaction, Western blotting, and immunofluorescence to screen a variety of natural compounds, and found that Loureirin B (LrB) effectively promoted neuron polarization and axon regeneration in vitro and in vivo. LrB significantly inhibited ER stress and thereby promoted mitochondrial functions by regulating mitochondrial fusion. Further, LrB reactivated the Akt/GSK-3β pathway, which plays critical roles in cell survival and microtubule stabilization. Taken together, our results suggest that the effects of LrB on neuron regeneration involve the inhibition of ER stress-induced mitochondrial dysfunction and activation of the Akt/GSK-3β pathway, which further promotes microtubule stabilization. LrB may therefore be a promising candidate for facilitating recovery following SCI.
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Affiliation(s)
- Qingqing Wang
- 1 Department of Orthopedics, Second Affiliated Hospital and Yuying Children's Hospital, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China.,2 Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China
| | - Hanxiao Cai
- 1 Department of Orthopedics, Second Affiliated Hospital and Yuying Children's Hospital, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China.,2 Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China
| | - Zhenxin Hu
- 1 Department of Orthopedics, Second Affiliated Hospital and Yuying Children's Hospital, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China.,2 Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China
| | - Yanqing Wu
- 3 The Institute of Life Sciences, Wenzhou University, Wenzhou, China
| | - Xin Guo
- 2 Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China
| | - Jiawei Li
- 2 Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China
| | - Haoli Wang
- 1 Department of Orthopedics, Second Affiliated Hospital and Yuying Children's Hospital, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China
| | - Yani Liu
- 1 Department of Orthopedics, Second Affiliated Hospital and Yuying Children's Hospital, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China
| | - Yanlong Liu
- 2 Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China
| | - Ling Xie
- 2 Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China
| | - Ke Xu
- 3 The Institute of Life Sciences, Wenzhou University, Wenzhou, China
| | - Huazi Xu
- 1 Department of Orthopedics, Second Affiliated Hospital and Yuying Children's Hospital, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China
| | - Huacheng He
- 4 College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, China
| | - Hongyu Zhang
- 2 Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China
| | - Jian Xiao
- 1 Department of Orthopedics, Second Affiliated Hospital and Yuying Children's Hospital, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China.,2 Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China
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Suman M, Sharpe JA, Bentham RB, Kotiadis VN, Menegollo M, Pignataro V, Molgó J, Muntoni F, Duchen MR, Pegoraro E, Szabadkai G. Inositol trisphosphate receptor-mediated Ca2+ signalling stimulates mitochondrial function and gene expression in core myopathy patients. Hum Mol Genet 2019; 27:2367-2382. [PMID: 29701772 PMCID: PMC6005141 DOI: 10.1093/hmg/ddy149] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Accepted: 04/16/2018] [Indexed: 12/19/2022] Open
Abstract
Core myopathies are a group of childhood muscle disorders caused by mutations of the ryanodine receptor (RyR1), the Ca2+ release channel of the sarcoplasmic reticulum. These mutations have previously been associated with elevated inositol trisphosphate receptor (IP3R) levels in skeletal muscle myotubes derived from patients. However, the functional relevance and the relationship of IP3R mediated Ca2+ signalling with the pathophysiology of the disease is unclear. It has also been suggested that mitochondrial dysfunction underlies the development of central and diffuse multi-mini-cores, devoid of mitochondrial activity, which is a key pathological consequence of RyR1 mutations. Here we used muscle biopsies of central core and multi-minicore disease patients with RyR1 mutations, as well as cellular and in vivo mouse models of the disease to characterize global cellular and mitochondrial Ca2+ signalling, mitochondrial function and gene expression associated with the disease. We show that RyR1 mutations that lead to the depletion of the channel are associated with increased IP3-mediated nuclear and mitochondrial Ca2+ signals and increased mitochondrial activity. Moreover, western blot and microarray analysis indicated enhanced mitochondrial biogenesis at the transcriptional and protein levels and was reflected in increased mitochondrial DNA content. The phenotype was recapitulated by RYR1 silencing in mouse cellular myotube models. Altogether, these data indicate that remodelling of skeletal muscle Ca2+ signalling following loss of functional RyR1 mediates bioenergetic adaptation.
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Affiliation(s)
- Matteo Suman
- Department of Biomedical Sciences, University of Padua, 35131 Padua, Italy.,Neuromuscular Unit, Department of Neuroscience, University of Padova, 35131 Padua, Italy
| | - Jenny A Sharpe
- Department of Cell and Developmental Biology, Consortium for Mitochondrial Research, University College London, London WC1E 6BT, UK
| | - Robert B Bentham
- Department of Cell and Developmental Biology, Consortium for Mitochondrial Research, University College London, London WC1E 6BT, UK.,The Francis Crick Institute, London NW1 1AT, UK
| | - Vassilios N Kotiadis
- Department of Cell and Developmental Biology, Consortium for Mitochondrial Research, University College London, London WC1E 6BT, UK
| | - Michela Menegollo
- Department of Biomedical Sciences, University of Padua, 35131 Padua, Italy
| | - Viviana Pignataro
- Department of Biomedical Sciences, University of Padua, 35131 Padua, Italy
| | - Jordi Molgó
- Commissariat à l'Energie Atomique et aux Énergies Alternatives (CEA), Institut des Sciences du Vivant Frédéric Joliot, Université Paris-Saclay, Service d'Ingénierie Moléculaire des Protéines, Gif-sur-Yvette 91191, France.,Institut des Neurosciences Paris-Saclay, UMR 9197, Centre National de la Recherche Scientifique (CNRS)/Université Paris-Sud, Gif-sur-Yvette 91198, France
| | - Francesco Muntoni
- University College London, Great Ormond Street Institute of Child Health Dubowitz Neuromuscular Centre and Medical Research Council (MRC) Centre for Neuromuscular Diseases, London WC1N 1EH, UK
| | - Michael R Duchen
- Department of Cell and Developmental Biology, Consortium for Mitochondrial Research, University College London, London WC1E 6BT, UK
| | - Elena Pegoraro
- Neuromuscular Unit, Department of Neuroscience, University of Padova, 35131 Padua, Italy
| | - Gyorgy Szabadkai
- Department of Biomedical Sciences, University of Padua, 35131 Padua, Italy.,Department of Cell and Developmental Biology, Consortium for Mitochondrial Research, University College London, London WC1E 6BT, UK.,The Francis Crick Institute, London NW1 1AT, UK
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249
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Mitachi K, Kurosu SM, Eslamimehr S, Lemieux MR, Ishizaki Y, Clemons WM, Kurosu M. Semisynthesis of an Anticancer DPAGT1 Inhibitor from a Muraymycin Biosynthetic Intermediate. Org Lett 2019; 21:876-879. [PMID: 30698984 PMCID: PMC6447083 DOI: 10.1021/acs.orglett.8b03716] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We have explored a method to convert a muraymycin biosynthetic intermediate 3 to an anticancer drug lead 2 for in vivo and thorough preclinical studies. Cu(OAc)2 forms a stable complex with the amide 4 and prevents electrophilic reactions at the 2-((3-aminopropyl)amino)acetamide moiety. Under the present conditions, the desired 5″-primary amine was selectively protected with (Boc)2O to yield 6. The intermediate 6 was converted to 2 in two steps with 90% yield.
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Affiliation(s)
- Katsuhiko Mitachi
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Tennessee Health Science Center , 881 Madison Avenue , Memphis , Tennessee 38163 , United States
| | - Shou M Kurosu
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Tennessee Health Science Center , 881 Madison Avenue , Memphis , Tennessee 38163 , United States
| | - Shakiba Eslamimehr
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Tennessee Health Science Center , 881 Madison Avenue , Memphis , Tennessee 38163 , United States
| | - Maddie R Lemieux
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Tennessee Health Science Center , 881 Madison Avenue , Memphis , Tennessee 38163 , United States
| | - Yoshimasa Ishizaki
- Laboratory of Microbiology , Institute of Microbial Chemistry (BIKAKEN) , 3-14-23, Kamiosaki , Shinagawa-ku, Tokyo 141-0021 , Japan
| | - William M Clemons
- Division of Chemistry and Chemical Engineering , California Institute of Technology , 1200 E. California Boulevard , Pasadena , California 91125 , United States
| | - Michio Kurosu
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Tennessee Health Science Center , 881 Madison Avenue , Memphis , Tennessee 38163 , United States
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250
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Abstract
Many molecular and functional details of single events in mitochondrial dynamics have been reported, but little is known about their coordination. A recent study describes how cellular Ca2+ signals, via remodelling the actin cytoskeleton, synchronise the formation of endoplasmic reticulum-mitochondria contacts with inner and outer mitochondrial membrane fission.
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