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Barak T, Ristori E, Ercan-Sencicek AG, Miyagishima DF, Nelson-Williams C, Dong W, Jin SC, Prendergast A, Armero W, Henegariu O, Erson-Omay EZ, Harmancı AS, Guy M, Gültekin B, Kilic D, Rai DK, Goc N, Aguilera SM, Gülez B, Altinok S, Ozcan K, Yarman Y, Coskun S, Sempou E, Deniz E, Hintzen J, Cox A, Fomchenko E, Jung SW, Ozturk AK, Louvi A, Bilgüvar K, Connolly ES, Khokha MK, Kahle KT, Yasuno K, Lifton RP, Mishra-Gorur K, Nicoli S, Günel M. PPIL4 is essential for brain angiogenesis and implicated in intracranial aneurysms in humans. Nat Med 2021; 27:2165-2175. [PMID: 34887573 PMCID: PMC8768030 DOI: 10.1038/s41591-021-01572-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Accepted: 10/05/2021] [Indexed: 12/16/2022]
Abstract
Intracranial aneurysm (IA) rupture leads to subarachnoid hemorrhage, a sudden-onset disease that often causes death or severe disability. Although genome-wide association studies have identified common genetic variants that increase IA risk moderately, the contribution of variants with large effect remains poorly defined. Using whole-exome sequencing, we identified significant enrichment of rare, deleterious mutations in PPIL4, encoding peptidyl-prolyl cis-trans isomerase-like 4, in both familial and index IA cases. Ppil4 depletion in vertebrate models causes intracerebral hemorrhage, defects in cerebrovascular morphology and impaired Wnt signaling. Wild-type, but not IA-mutant, PPIL4 potentiates Wnt signaling by binding JMJD6, a known angiogenesis regulator and Wnt activator. These findings identify a novel PPIL4-dependent Wnt signaling mechanism involved in brain-specific angiogenesis and maintenance of cerebrovascular integrity and implicate PPIL4 gene mutations in the pathogenesis of IA.
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Affiliation(s)
- Tanyeri Barak
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
- Department of Neuroscience, Yale School of Medicine, New Haven, CT, USA
- Yale Program on Neurogenetics, Yale School of Medicine, New Haven, CT, USA
| | - Emma Ristori
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
- Yale Cardiovascular Research Center, Department of Internal Medicine, Section of Cardiology, Yale School of Medicine, New Haven, CT, USA
| | - A Gulhan Ercan-Sencicek
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
- Department of Neuroscience, Yale School of Medicine, New Haven, CT, USA
- Yale Program on Neurogenetics, Yale School of Medicine, New Haven, CT, USA
| | - Danielle F Miyagishima
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
- Department of Neuroscience, Yale School of Medicine, New Haven, CT, USA
- Yale Program on Neurogenetics, Yale School of Medicine, New Haven, CT, USA
| | | | - Weilai Dong
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
- Laboratory of Human Genetics and Genomics, The Rockefeller University, New York, NY, USA
| | - Sheng Chih Jin
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
- Laboratory of Human Genetics and Genomics, The Rockefeller University, New York, NY, USA
- Department of Genetics, Washington University School of Medicine, St. Louis, MO, USA
| | - Andrew Prendergast
- Yale Cardiovascular Research Center, Department of Internal Medicine, Section of Cardiology, Yale School of Medicine, New Haven, CT, USA
| | - William Armero
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
- Yale Cardiovascular Research Center, Department of Internal Medicine, Section of Cardiology, Yale School of Medicine, New Haven, CT, USA
| | - Octavian Henegariu
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
- Department of Neuroscience, Yale School of Medicine, New Haven, CT, USA
- Yale Program on Neurogenetics, Yale School of Medicine, New Haven, CT, USA
| | - E Zeynep Erson-Omay
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
- Department of Neuroscience, Yale School of Medicine, New Haven, CT, USA
- Yale Program on Neurogenetics, Yale School of Medicine, New Haven, CT, USA
| | - Akdes Serin Harmancı
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
- Department of Neuroscience, Yale School of Medicine, New Haven, CT, USA
- Yale Program on Neurogenetics, Yale School of Medicine, New Haven, CT, USA
| | - Mikhael Guy
- Yale Center for Research Computing, Yale University, New Haven, CT, USA
| | - Batur Gültekin
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
| | - Deniz Kilic
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
| | - Devendra K Rai
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
- Department of Neuroscience, Yale School of Medicine, New Haven, CT, USA
- Yale Program on Neurogenetics, Yale School of Medicine, New Haven, CT, USA
| | - Nükte Goc
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
| | | | - Burcu Gülez
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
| | - Selin Altinok
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
| | - Kent Ozcan
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
| | - Yanki Yarman
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
| | - Süleyman Coskun
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
- Department of Neuroscience, Yale School of Medicine, New Haven, CT, USA
- Yale Program on Neurogenetics, Yale School of Medicine, New Haven, CT, USA
| | - Emily Sempou
- Department of Pediatrics, Yale School of Medicine, New Haven, CT, USA
| | - Engin Deniz
- Department of Pediatrics, Yale School of Medicine, New Haven, CT, USA
| | - Jared Hintzen
- Yale Cardiovascular Research Center, Department of Internal Medicine, Section of Cardiology, Yale School of Medicine, New Haven, CT, USA
| | - Andrew Cox
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
| | - Elena Fomchenko
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
| | - Su Woong Jung
- Division of Nephrology, Department of Internal Medicine, Kyung Hee University Hospital at Gangdong, Seoul, Korea
| | - Ali Kemal Ozturk
- Department of Neurosurgery, Pennsylvania Hospital, University of Pennsylvania Health System, Philadelphia, Pennsylvania, USA
| | - Angeliki Louvi
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
- Yale Program on Neurogenetics, Yale School of Medicine, New Haven, CT, USA
| | - Kaya Bilgüvar
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
- Yale Program on Neurogenetics, Yale School of Medicine, New Haven, CT, USA
- Yale Center for Genome Analysis, Yale University, New Haven, CT, USA
| | - E Sander Connolly
- Department of Neurosurgery, Columbia University College of Physicians and Surgeons, New York, NY, USA
| | - Mustafa K Khokha
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
- Department of Pediatrics, Yale School of Medicine, New Haven, CT, USA
| | - Kristopher T Kahle
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
- Department of Neurosurgery, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
- Broad Institute of MIT and Harvard, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Katsuhito Yasuno
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
- Department of Neuroscience, Yale School of Medicine, New Haven, CT, USA
- Yale Program on Neurogenetics, Yale School of Medicine, New Haven, CT, USA
| | - Richard P Lifton
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
- Laboratory of Human Genetics and Genomics, The Rockefeller University, New York, NY, USA
| | - Ketu Mishra-Gorur
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA.
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA.
- Department of Neuroscience, Yale School of Medicine, New Haven, CT, USA.
- Yale Program on Neurogenetics, Yale School of Medicine, New Haven, CT, USA.
| | - Stefania Nicoli
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA.
- Yale Cardiovascular Research Center, Department of Internal Medicine, Section of Cardiology, Yale School of Medicine, New Haven, CT, USA.
- Department of Pharmacology, Yale School of Medicine, New Haven, CT, USA.
| | - Murat Günel
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA.
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA.
- Department of Neuroscience, Yale School of Medicine, New Haven, CT, USA.
- Yale Program on Neurogenetics, Yale School of Medicine, New Haven, CT, USA.
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Hao Y, Chu J, Shi L, Ma C, Hui L, Cao X, Wang Y, Xu M, Fu A. Identification of interacting proteins of Arabidopsis cyclophilin38 (AtCYP38) via multiple screening approaches reveals its possible broad functions in chloroplasts. J Plant Physiol 2021; 264:153487. [PMID: 34358944 DOI: 10.1016/j.jplph.2021.153487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 07/26/2021] [Accepted: 07/27/2021] [Indexed: 06/13/2023]
Abstract
AtCYP38, a thylakoid lumen localized immunophilin, is found to be essential for photosystem II assembly and maintenance, but how AtCYP38 functions in chloroplast remains unknown. Based on previous functional studies and its crystal structure, we hypothesize that AtCYP38 should function via binding its targets or cofactors in the thylakoid lumen. To identify potential interacting proteins of AtCYP38, we first adopted ATTED-II and STRING web-tools, and found 12 proteins functionally related to AtCYP38. We then screened a yeast two-hybrid library including an Arabidopsis genome wide cDNA with different domain of AtCYP38, and five thylakoid lumen-localized targets were identified. In order to specifically search interacting proteins of AtCYP38 in the thylakoid lumen, we generated a yeast two-hybrid mini library including the thylakoid lumenal proteins and lumenal fractions of thylakoid membrane proteins, and we obtained six thylakoid membrane proteins and nine thylakoid lumenal proteins as interacting proteins of AtCYP38. The interactions between AtCYP38 and several potential targets were further confirmed via pull-down and co-immunoprecipitation assays. Together, a couple of new potential candidate interacting proteins of AtCYP38 were identified, and the results will lay a foundation for unveiling the regulatory mechanisms in photosynthesis by AtCYP38.
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Affiliation(s)
- Yaqi Hao
- Chinese Education Ministry's Key Laboratory of Western Resources and Modern Biotechnology, Key Laboratory of Biotechnology Shaanxi Province, College of Life Sciences, Northwest University, China P.R.229 North Taibai Road, Xi'an, Shaanxi, 710069, China
| | - Jiashu Chu
- Chinese Education Ministry's Key Laboratory of Western Resources and Modern Biotechnology, Key Laboratory of Biotechnology Shaanxi Province, College of Life Sciences, Northwest University, China P.R.229 North Taibai Road, Xi'an, Shaanxi, 710069, China
| | - Lujing Shi
- Chinese Education Ministry's Key Laboratory of Western Resources and Modern Biotechnology, Key Laboratory of Biotechnology Shaanxi Province, College of Life Sciences, Northwest University, China P.R.229 North Taibai Road, Xi'an, Shaanxi, 710069, China
| | - Cong Ma
- Chinese Education Ministry's Key Laboratory of Western Resources and Modern Biotechnology, Key Laboratory of Biotechnology Shaanxi Province, College of Life Sciences, Northwest University, China P.R.229 North Taibai Road, Xi'an, Shaanxi, 710069, China
| | - Liangliang Hui
- Chinese Education Ministry's Key Laboratory of Western Resources and Modern Biotechnology, Key Laboratory of Biotechnology Shaanxi Province, College of Life Sciences, Northwest University, China P.R.229 North Taibai Road, Xi'an, Shaanxi, 710069, China
| | - Xiaofei Cao
- Chinese Education Ministry's Key Laboratory of Western Resources and Modern Biotechnology, Key Laboratory of Biotechnology Shaanxi Province, College of Life Sciences, Northwest University, China P.R.229 North Taibai Road, Xi'an, Shaanxi, 710069, China
| | - Yuhua Wang
- Chinese Education Ministry's Key Laboratory of Western Resources and Modern Biotechnology, Key Laboratory of Biotechnology Shaanxi Province, College of Life Sciences, Northwest University, China P.R.229 North Taibai Road, Xi'an, Shaanxi, 710069, China
| | - Min Xu
- Chinese Education Ministry's Key Laboratory of Western Resources and Modern Biotechnology, Key Laboratory of Biotechnology Shaanxi Province, College of Life Sciences, Northwest University, China P.R.229 North Taibai Road, Xi'an, Shaanxi, 710069, China
| | - Aigen Fu
- Chinese Education Ministry's Key Laboratory of Western Resources and Modern Biotechnology, Key Laboratory of Biotechnology Shaanxi Province, College of Life Sciences, Northwest University, China P.R.229 North Taibai Road, Xi'an, Shaanxi, 710069, China.
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3
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Liu W, Barbosa Dos Santos I, Moye A, Park SW. CYP20-3 deglutathionylates 2-CysPRX A and suppresses peroxide detoxification during heat stress. Life Sci Alliance 2020; 3:e202000775. [PMID: 32732254 PMCID: PMC7409537 DOI: 10.26508/lsa.202000775] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 07/17/2020] [Accepted: 07/21/2020] [Indexed: 11/24/2022] Open
Abstract
In plants, growth-defense trade-offs occur because of limited resources, which demand prioritization towards either of them depending on various external and internal factors. However, very little is known about molecular mechanisms underlying their occurrence. Here, we describe that cyclophilin 20-3 (CYP20-3), a 12-oxo-phytodienoic acid (OPDA)-binding protein, crisscrosses stress responses with light-dependent electron reactions, which fine-tunes activities of key enzymes in plastid sulfur assimilations and photosynthesis. Under stressed states, OPDA, accumulates in the chloroplasts, binds and stimulates CYP20-3 to convey electrons towards serine acetyltransferase 1 (SAT1) and 2-Cys peroxiredoxin A (2CPA). The latter is a thiol-based peroxidase, protecting and optimizing photosynthesis by reducing its toxic byproducts (e.g., H2O2). Reduction of 2CPA then inactivates its peroxidase activity, suppressing the peroxide detoxification machinery, whereas the activation of SAT1 promotes thiol synthesis and builds up reduction capacity, which in turn triggers the retrograde regulation of defense gene expressions against abiotic stress. Thus, we conclude that CYP20-3 is a unique metabolic hub conveying resource allocations between plant growth and defense responses (trade-offs), ultimately balancing optimal growth phonotype.
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Affiliation(s)
- Wenshan Liu
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL, USA
| | | | - Anna Moye
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL, USA
| | - Sang-Wook Park
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL, USA
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Xiao Y, Karam C, Yi J, Zhang L, Li X, Yoon D, Wang H, Dhakal K, Ramlow P, Yu T, Mo Z, Ma J, Zhou J. ROS-related mitochondrial dysfunction in skeletal muscle of an ALS mouse model during the disease progression. Pharmacol Res 2018; 138:25-36. [PMID: 30236524 PMCID: PMC6263743 DOI: 10.1016/j.phrs.2018.09.008] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 09/07/2018] [Accepted: 09/07/2018] [Indexed: 02/06/2023]
Abstract
In amyotrophic lateral sclerosis (ALS), mitochondrial dysfunction and oxidative stress form a vicious cycle that promotes neurodegeneration and muscle wasting. To quantify the disease-stage-dependent changes of mitochondrial function and their relationship to the generation of reactive oxygen species (ROS), we generated double transgenic mice (G93A/cpYFP) that carry human ALS mutation SOD1G93A and mt-cpYFP transgenes, in which mt-cpYFP detects dynamic changes of ROS-related mitoflash events at individual mitochondria level. Compared with wild type mice, mitoflash activity in the SOD1G93A (G93A) mouse muscle showed an increased flashing frequency prior to the onset of ALS symptom (at the age of 2 months), whereas the onset of ALS symptoms (at the age of 4 months) is associated with drastic changes in the kinetics property of mitoflash signal with prolonged full duration at half maximum (FDHM). Elevated levels of cytosolic ROS in skeletal muscle derived from the SOD1G93A mice were confirmed with fluorescent probes, MitoSOX™ Red and ROS Brite™570. Immunoblotting analysis of subcellular mitochondrial fractionation of G93A muscle revealed an increased expression level of cyclophilin D (CypD), a regulatory component of the mitochondrial permeability transition pore (mPTP), at the age of 4 months but not at the age of 2 months. Transient overexpressing of SOD1G93A in skeletal muscle of wild type mice directly promoted mitochondrial ROS production with an enhanced mitoflash activity in the absence of motor neuron axonal withdrawal. Remarkably, the SOD1G93A-induced mitoflash activity was attenuated by the application of cyclosporine A (CsA), an inhibitor of CypD. Similar to the observation with the SOD1G93A transgenic mice, an increased expression level of CypD was also detected in skeletal muscle following transient overexpression of SOD1G93A. Overall, this study reveals a disease-stage-dependent change in mitochondrial function that is associated with CypD-dependent mPTP opening; and the ALS mutation SOD1G93A directly contributes to mitochondrial dysfunction in the absence of motor neuron axonal withdrawal.
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Affiliation(s)
- Yajuan Xiao
- Kansas City University of Medicine and Bioscience, Kansas City, USA; Rush University School of Medicine, Chicago, IL, USA
| | - Chehade Karam
- Rush University School of Medicine, Chicago, IL, USA
| | - Jianxun Yi
- Kansas City University of Medicine and Bioscience, Kansas City, USA; Rush University School of Medicine, Chicago, IL, USA
| | - Lin Zhang
- Kansas City University of Medicine and Bioscience, Kansas City, USA; Zunyi Medical College, Zunyi, China
| | - Xuejun Li
- Kansas City University of Medicine and Bioscience, Kansas City, USA
| | - Dosuk Yoon
- Kansas City University of Medicine and Bioscience, Kansas City, USA
| | - Huan Wang
- Kansas City University of Medicine and Bioscience, Kansas City, USA
| | - Kamal Dhakal
- Kansas City University of Medicine and Bioscience, Kansas City, USA
| | - Paul Ramlow
- Kansas City University of Medicine and Bioscience, Kansas City, USA
| | - Tian Yu
- Zunyi Medical College, Zunyi, China
| | - Zhaohui Mo
- 3rd Xiangya Hospital, Central South University, Changsha, China
| | - Jianjie Ma
- Wexner Medical Center, The Ohio State University, Columbus, OH, USA
| | - Jingsong Zhou
- Kansas City University of Medicine and Bioscience, Kansas City, USA; Rush University School of Medicine, Chicago, IL, USA.
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Armstrong JA, Cash NJ, Ouyang Y, Morton JC, Chvanov M, Latawiec D, Awais M, Tepikin AV, Sutton R, Criddle DN. Oxidative stress alters mitochondrial bioenergetics and modifies pancreatic cell death independently of cyclophilin D, resulting in an apoptosis-to-necrosis shift. J Biol Chem 2018; 293:8032-8047. [PMID: 29626097 PMCID: PMC5971444 DOI: 10.1074/jbc.ra118.003200] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 04/05/2018] [Indexed: 12/29/2022] Open
Abstract
Mitochondrial dysfunction lies at the core of acute pancreatitis (AP). Diverse AP stimuli induce Ca2+-dependent formation of the mitochondrial permeability transition pore (MPTP), a solute channel modulated by cyclophilin D (CypD), the formation of which causes ATP depletion and necrosis. Oxidative stress reportedly triggers MPTP formation and is elevated in clinical AP, but how reactive oxygen species influence cell death is unclear. Here, we assessed potential MPTP involvement in oxidant-induced effects on pancreatic acinar cell bioenergetics and fate. H2O2 application promoted acinar cell apoptosis at low concentrations (1-10 μm), whereas higher levels (0.5-1 mm) elicited rapid necrosis. H2O2 also decreased the mitochondrial NADH/FAD+ redox ratio and ΔΨm in a concentration-dependent manner (10 μm to 1 mm H2O2), with maximal effects at 500 μm H2O2 H2O2 decreased the basal O2 consumption rate of acinar cells, with no alteration of ATP turnover at <50 μm H2O2 However, higher H2O2 levels (≥50 μm) diminished spare respiratory capacity and ATP turnover, and bioenergetic collapse, ATP depletion, and cell death ensued. Menadione exerted detrimental bioenergetic effects similar to those of H2O2, which were inhibited by the antioxidant N-acetylcysteine. Oxidant-induced bioenergetic changes, loss of ΔΨm, and cell death were not ameliorated by genetic deletion of CypD or by its acute inhibition with cyclosporine A. These results indicate that oxidative stress alters mitochondrial bioenergetics and modifies pancreatic acinar cell death. A shift from apoptosis to necrosis appears to be associated with decreased mitochondrial spare respiratory capacity and ATP production, effects that are independent of CypD-sensitive MPTP formation.
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Affiliation(s)
- Jane A Armstrong
- Departments of Molecular and Clinical Cancer Medicine, Institute of Translational Medicine, University of Liverpool, Liverpool L69 3BX, United Kingdom
| | - Nicole J Cash
- Departments of Cellular & Molecular Physiology, University of Liverpool, Liverpool L69 3BX, United Kingdom
| | - Yulin Ouyang
- Departments of Cellular & Molecular Physiology, University of Liverpool, Liverpool L69 3BX, United Kingdom
| | - Jack C Morton
- Departments of Cellular & Molecular Physiology, University of Liverpool, Liverpool L69 3BX, United Kingdom
| | - Michael Chvanov
- Departments of Cellular & Molecular Physiology, University of Liverpool, Liverpool L69 3BX, United Kingdom
| | - Diane Latawiec
- Departments of Molecular and Clinical Cancer Medicine, Institute of Translational Medicine, University of Liverpool, Liverpool L69 3BX, United Kingdom
| | - Muhammad Awais
- Departments of Molecular and Clinical Cancer Medicine, Institute of Translational Medicine, University of Liverpool, Liverpool L69 3BX, United Kingdom
| | - Alexei V Tepikin
- Departments of Cellular & Molecular Physiology, University of Liverpool, Liverpool L69 3BX, United Kingdom
| | - Robert Sutton
- Departments of Molecular and Clinical Cancer Medicine, Institute of Translational Medicine, University of Liverpool, Liverpool L69 3BX, United Kingdom
| | - David N Criddle
- Departments of Cellular & Molecular Physiology, University of Liverpool, Liverpool L69 3BX, United Kingdom.
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Varjú I, Farkas VJ, Kőhidai L, Szabó L, Farkas ÁZ, Polgár L, Chinopoulos C, Kolev K. Functional cyclophilin D moderates platelet adhesion, but enhances the lytic resistance of fibrin. Sci Rep 2018; 8:5366. [PMID: 29599453 PMCID: PMC5876378 DOI: 10.1038/s41598-018-23725-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Accepted: 03/20/2018] [Indexed: 01/11/2023] Open
Abstract
In the course of thrombosis, platelets are exposed to a variety of activating stimuli classified as 'strong' (e.g. thrombin and collagen) or 'mild' (e.g. ADP). In response, activated platelets adhere to injured vasculature, aggregate, and stabilise the three-dimensional fibrin scaffold of the expanding thrombus. Since 'strong' stimuli also induce opening of the mitochondrial permeability transition pore (MPTP) in platelets, the MPTP-enhancer Cyclophilin D (CypD) has been suggested as a critical pharmacological target to influence thrombosis. However, it is poorly understood what role CypD plays in the platelet response to 'mild' stimuli which act independently of MPTP. Furthermore, it is unknown how CypD influences platelet-driven clot stabilisation against enzymatic breakdown (fibrinolysis). Here we show that treatment of human platelets with Cyclosporine A (a cyclophilin-inhibitor) boosts ADP-induced adhesion and aggregation, while genetic ablation of CypD in murine platelets enhances adhesion but not aggregation. We also report that platelets lacking CypD preserve their integrity in a fibrin environment, and lose their ability to render clots resistant against fibrinolysis. Our results indicate that CypD has opposing haemostatic roles depending on the stimulus and stage of platelet activation, warranting a careful design of any antithrombotic strategy targeting CypD.
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Affiliation(s)
- Imre Varjú
- Department of Medical Biochemistry, Semmelweis University, Budapest, 1094, Hungary
- Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, 02115, USA
- Department of Sociomedical Sciences, Mailman School of Public Health, Columbia University, New York, NY, 10032, USA
| | | | - László Kőhidai
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, 1089, Hungary
| | - László Szabó
- Department of Functional and Structural Materials, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, 1117, Hungary
| | - Ádám Zoltán Farkas
- Department of Medical Biochemistry, Semmelweis University, Budapest, 1094, Hungary
| | - Lívia Polgár
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, 1089, Hungary
| | - Christos Chinopoulos
- Department of Medical Biochemistry, Semmelweis University, Budapest, 1094, Hungary
- MTA-SE Lendület Neurobiochemistry Research Group, Budapest, 1094, Hungary
| | - Krasimir Kolev
- Department of Medical Biochemistry, Semmelweis University, Budapest, 1094, Hungary.
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7
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Xiao A, Gan X, Chen R, Ren Y, Yu H, You C. The cyclophilin D/Drp1 axis regulates mitochondrial fission contributing to oxidative stress-induced mitochondrial dysfunctions in SH-SY5Y cells. Biochem Biophys Res Commun 2017; 483:765-771. [PMID: 27993675 DOI: 10.1016/j.bbrc.2016.12.068] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2016] [Accepted: 12/09/2016] [Indexed: 02/05/2023]
Abstract
Oxidative stress plays a central role in the pathogenesis of various neurodegenerative diseases. Increasing evidences have demonstrated that structural abnormalities in mitochondria are involved in oxidative stress related nerve cell damage. And Drp1 plays a critical role in mitochondrial dynamic imbalance insulted by oxidative stress-derived mitochondria. However, the status of mitochondrial fusion and fission pathway and its relationship with mitochondrial properties such as mitochondrial membrane permeability transition pore (mPTP) have not been fully elucidated. Here, we demonstrated for the first time the role of Cyclophilin D (CypD), a crucial component for mPTP formation, in the regulation of mitochondrial dynamics in oxidative stress treated nerve cell. We observed that CypD-mediated phosphorylation of Drp1 and subsequently augmented Drp1 recruitment to mitochondria and shifts mitochondrial dynamics toward excessive fission, which contributes to the mitochondrial structural and functional dysfunctions in oxidative stress-treated nerve cells. CypD depletion or over expression accompanies mitochondrial dynamics/functions recovery or aggravation separately. We also demonstrated first time the link between the CypD to mitochondrial dynamics. Our data offer new insights into the mechanism of mitochondrial dynamics which contribute to the mitochondrial dysfunctions, specifically the role of CypD in Drp1-mediated mitochondrial fission. The protective effect of CsA, or other molecules affecting the function of CypD hold promise as a potential novel therapeutic strategy for governing oxidative stress pathology via mitochondrial pathways.
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Affiliation(s)
- Anqi Xiao
- Department of Neurosurgery, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Xueqi Gan
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China
| | - Ruiqi Chen
- Department of Neurosurgery, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Yanming Ren
- Department of Neurosurgery, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Haiyang Yu
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China
| | - Chao You
- Department of Neurosurgery, West China Hospital, Sichuan University, Chengdu, 610041, China.
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Laker RC, Taddeo EP, Akhtar YN, Zhang M, Hoehn KL, Yan Z. The Mitochondrial Permeability Transition Pore Regulator Cyclophilin D Exhibits Tissue-Specific Control of Metabolic Homeostasis. PLoS One 2016; 11:e0167910. [PMID: 28005946 PMCID: PMC5179060 DOI: 10.1371/journal.pone.0167910] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 11/22/2016] [Indexed: 11/20/2022] Open
Abstract
The mitochondrial permeability transition pore (mPTP) is a key regulator of mitochondrial function that has been implicated in the pathogenesis of metabolic disease. Cyclophilin D (CypD) is a critical regulator that directly binds to mPTP constituents to facilitate the pore opening. We previously found that global CypD knockout mice (KO) are protected from diet-induced glucose intolerance; however, the tissue-specific function of CypD and mPTP, particularly in the control of glucose homeostasis, has not been ascertained. To this end, we performed calcium retention capacity (CRC) assay to compare the importance of CypD in the liver versus skeletal muscle. We found that liver mitochondria are more dependent on CypD for mPTP opening than skeletal muscle mitochondria. To ascertain the tissue-specific role of CypD in metabolic homeostasis, we generated liver-specific and muscle-specific CypD knockout mice (LKO and MKO, respectively) and fed them either a chow diet or 45% high-fat diet (HFD) for 14 weeks. MKO mice displayed similar body weight gain and glucose intolerance compared with wild type littermates (WT), whereas LKO mice developed greater visceral obesity, glucose intolerance and pyruvate intolerance compared with WT mice. These findings demonstrate that loss of muscle CypD is not sufficient to alter whole body glucose metabolism, while the loss of liver CypD exacerbates obesity and whole-body metabolic dysfunction in mice fed HFD.
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Affiliation(s)
- Rhianna C. Laker
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, United States of America
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, United States of America
| | - Evan P. Taddeo
- Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA, United States of America
| | - Yasir N. Akhtar
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, United States of America
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, United States of America
| | - Mei Zhang
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, United States of America
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, United States of America
| | - Kyle L. Hoehn
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, United States of America
- Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA, United States of America
| | - Zhen Yan
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, United States of America
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, United States of America
- Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA, United States of America
- Department of Molecular Physiology & Biological Physics, University of Virginia School of Medicine, Charlottesville, VA, United States of America
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Briston T, Lewis S, Koglin M, Mistry K, Shen Y, Hartopp N, Katsumata R, Fukumoto H, Duchen MR, Szabadkai G, Staddon JM, Roberts M, Powney B. Identification of ER-000444793, a Cyclophilin D-independent inhibitor of mitochondrial permeability transition, using a high-throughput screen in cryopreserved mitochondria. Sci Rep 2016; 6:37798. [PMID: 27886240 PMCID: PMC5122887 DOI: 10.1038/srep37798] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Accepted: 11/02/2016] [Indexed: 12/19/2022] Open
Abstract
Growing evidence suggests persistent mitochondrial permeability transition pore (mPTP) opening is a key pathophysiological event in cell death underlying a variety of diseases. While it has long been clear the mPTP is a druggable target, current agents are limited by off-target effects and low therapeutic efficacy. Therefore identification and development of novel inhibitors is necessary. To rapidly screen large compound libraries for novel mPTP modulators, a method was exploited to cryopreserve large batches of functionally active mitochondria from cells and tissues. The cryopreserved mitochondria maintained respiratory coupling and ATP synthesis, Ca2+ uptake and transmembrane potential. A high-throughput screen (HTS), using an assay of Ca2+-induced mitochondrial swelling in the cryopreserved mitochondria identified ER-000444793, a potent inhibitor of mPTP opening. Further evaluation using assays of Ca2+-induced membrane depolarisation and Ca2+ retention capacity also indicated that ER-000444793 acted as an inhibitor of the mPTP. ER-000444793 neither affected cyclophilin D (CypD) enzymatic activity, nor displaced of CsA from CypD protein, suggesting a mechanism independent of CypD inhibition. Here we identified a novel, CypD-independent inhibitor of the mPTP. The screening approach and compound described provides a workflow and additional tool to aid the search for novel mPTP modulators and to help understand its molecular nature.
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Affiliation(s)
- Thomas Briston
- UCL Collaboration Research Group, NGM-PCU, Eisai Ltd., Hatfield, UK
| | - Sian Lewis
- UCL Collaboration Research Group, NGM-PCU, Eisai Ltd., Hatfield, UK
| | - Mumta Koglin
- UCL Collaboration Research Group, NGM-PCU, Eisai Ltd., Hatfield, UK
| | - Kavita Mistry
- UCL Collaboration Research Group, NGM-PCU, Eisai Ltd., Hatfield, UK
| | - Yongchun Shen
- Next Generation Systems CFU, Eisai Inc., Andover, MA, USA
| | - Naomi Hartopp
- UCL Collaboration Research Group, NGM-PCU, Eisai Ltd., Hatfield, UK
| | | | - Hironori Fukumoto
- NGM-PCU, Eisai Co. Ltd., Tsukuba Research Laboratories, Tsukuba, Japan
| | - Michael R. Duchen
- Department of Cell and Developmental Biology, University College London, London, UK
| | - Gyorgy Szabadkai
- Department of Cell and Developmental Biology, University College London, London, UK
- Department of Biomedical Sciences, University of Padua, Padua, Italy
| | - James M. Staddon
- UCL Collaboration Research Group, NGM-PCU, Eisai Ltd., Hatfield, UK
| | - Malcolm Roberts
- UCL Collaboration Research Group, NGM-PCU, Eisai Ltd., Hatfield, UK
| | - Ben Powney
- UCL Collaboration Research Group, NGM-PCU, Eisai Ltd., Hatfield, UK
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10
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Affiliation(s)
- Maggie P Y Lam
- From the Departments of Physiology and Medicine, the NHLBI Proteomics Center, David Geffen School of Medicine at University of California Los Angeles, CA
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11
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Abstract
RATIONALE Mice lacking cyclophilin D (CypD(-/-)), a mitochondrial chaperone protein, have altered cardiac metabolism. As acetylation has been shown to regulate metabolism, we tested whether changes in protein acetylation might play a role in these metabolic changes in CypD(-/-) hearts. OBJECTIVE Our aim was to test the hypothesis that loss of CypD alters the cardiac mitochondrial acetylome. METHODS AND RESULTS To identify changes in lysine-acetylated proteins and to map acetylation sites after ablation of CypD, we subjected tryptic digests of isolated cardiac mitochondria from wild-type and CypD(-/-) mice to immunoprecipitation using agarose beads coupled to antiacetyl lysine antibodies followed by mass spectrometry. We used label-free analysis for the relative quantification of the 875 common peptides that were acetylated in wild-type and CypD(-/-) samples and found 11 peptides (10 proteins) decreased and 96 peptides (48 proteins) increased in CypD(-/-) samples. We found increased acetylation of proteins in fatty acid oxidation and branched-chain amino acid metabolism. To evaluate whether this increase in acetylation might play a role in the inhibition of fatty acid oxidation that was previously reported in CypD(-/-) hearts, we measured the activity of l-3-hydroxyacyl-CoA dehydrogenase, which was acetylated in the CypD(-/-) hearts. Consistent with the hypothesis, l-3-hydroxyacyl-CoA dehydrogenase activity was inhibited by ≈50% compared with the wild-type mitochondria. CONCLUSIONS These results implicate a role for CypD in modulating protein acetylation. Taken together, these results suggest that ablation of CypD leads to changes in the mitochondrial acetylome, which may contribute to altered mitochondrial metabolism in CypD(-/-) mice.
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Affiliation(s)
- Tiffany Tuyen M. Nguyen
- Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Renee Wong
- Division of Cardiovascular Sciences, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Sara Menazza
- Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Junhui Sun
- Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Yong Chen
- Proteomics Core Facility, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Guanghui Wang
- Proteomics Core Facility, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Marjan Gucek
- Proteomics Core Facility, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | | | - Michael N. Sack
- Center for Molecular Medicine, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, 20892
| | - Elizabeth Murphy
- Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
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12
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Paillard M, Tubbs E, Thiebaut PA, Gomez L, Fauconnier J, Da Silva CC, Teixeira G, Mewton N, Belaidi E, Durand A, Abrial M, Lacampagne A, Rieusset J, Ovize M. Depressing mitochondria-reticulum interactions protects cardiomyocytes from lethal hypoxia-reoxygenation injury. Circulation 2013; 128:1555-65. [PMID: 23983249 DOI: 10.1161/circulationaha.113.001225] [Citation(s) in RCA: 194] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Under physiological conditions, Ca(2+) transfer from the endoplasmic reticulum (ER) to mitochondria might occur at least in part at contact points between the 2 organelles and involves the VDAC1/Grp75/IP3R1 complex. Accumulation of Ca(2+) into the mitochondrial matrix may activate the mitochondrial chaperone cyclophilin D (CypD) and trigger permeability transition pore opening, whose role in ischemia/reperfusion injury is well recognized. We questioned here whether the transfer of Ca(2+) from ER to mitochondria might play a role in cardiomyocyte death after hypoxia-reoxygenation. METHODS AND RESULTS We report that CypD interacts with the VDAC1/Grp75/IP3R1 complex in cardiomyocytes. Genetic or pharmacological inhibition of CypD in both H9c2 cardiomyoblasts and adult cardiomyocytes decreased the Ca(2+) transfer from ER to mitochondria through IP3R under normoxic conditions. During hypoxia-reoxygenation, the interaction between CypD and the IP3R1 Ca(2+) channeling complex increased concomitantly with mitochondrial Ca(2+) content. Inhibition of either CypD, IP3R1, or Grp75 decreased protein interaction within the complex, attenuated mitochondrial Ca(2+) overload, and protected cells from hypoxia-reoxygenation. Genetic or pharmacological inhibition of CypD provided a similar effect in adult mice cardiomyocytes. Disruption of ER-mitochondria interaction via the downregulation of Mfn2 similarly reduced the interaction between CypD and the IP3R1 complex and protected against hypoxia-reoxygenation injury. CONCLUSIONS Our data (1) point to a new role of CypD at the ER-mitochondria interface and (2) suggest that decreasing ER-mitochondria interaction at reperfusion can protect cardiomyocytes against lethal reperfusion injury through the reduction of mitochondrial Ca(2+) overload via the CypD/VDAC1/Grp75/IP3R1 complex.
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MESH Headings
- Animals
- Calcium Signaling/physiology
- Cell Hypoxia/physiology
- Cell Line
- Cells, Cultured/metabolism
- Peptidyl-Prolyl Isomerase F
- Cyclophilins/deficiency
- Cyclophilins/genetics
- Cyclophilins/physiology
- Endoplasmic Reticulum/physiology
- HSP70 Heat-Shock Proteins/physiology
- In Vitro Techniques
- Inositol 1,4,5-Trisphosphate Receptors/physiology
- Intracellular Membranes/physiology
- Male
- Membrane Proteins/physiology
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Mitochondria, Heart/physiology
- Multiprotein Complexes
- Myocardial Reperfusion Injury/prevention & control
- Myocytes, Cardiac/drug effects
- Myocytes, Cardiac/metabolism
- Myocytes, Cardiac/pathology
- Myocytes, Cardiac/ultrastructure
- Oxygen/toxicity
- Patch-Clamp Techniques
- Random Allocation
- Rats
- Voltage-Dependent Anion Channel 1/physiology
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Affiliation(s)
- Melanie Paillard
- From INSERM UMR-1060, Laboratoire CarMeN, Université Lyon 1, Faculté de médecine Rockefeller et Charles Merieux Lyon-Sud, Lyon (M.P., E.T., P.T., L.G., C.C. Da S., G.T., N.M., E.B., A.D., M.A., J.R., M.O.); INSERM UMR-1046, Université Montpellier 1, Université Montpellier 2, CHU de Montpellier, Montpellier (J.F., A.L.); and Hospices Civils de Lyon, Hôpital Louis Pradel, Service d'Explorations Fonctionnelles Cardiovasculaires and CIC de Lyon, Lyon (N.M., M.O.), France
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13
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Song IS, Kim HK, Lee SR, Jeong SH, Kim N, Ko KS, Rhee BD, Han J. Mitochondrial modulation decreases the bortezomib-resistance in multiple myeloma cells. Int J Cancer 2013; 133:1357-67. [PMID: 23463417 DOI: 10.1002/ijc.28149] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Accepted: 02/15/2013] [Indexed: 12/30/2022]
Abstract
Multiple myeloma (MM) is an incurable hematological malignancy that causes most patients to eventually relapse and die from their disease. The 20S proteasome inhibitor bortezomib has emerged as an effective drug for MM treatment; however, intrinsic and acquired resistance to bortezomib has already been observed in MM patients. We evaluated the involvement of mitochondria in resistance to bortezomib-induced cell death in two different MM cell lines (bortezomib-resistant KMS20 cells and bortezomib-sensitive KMS28BM cells). Indices of mitochondrial function, including membrane potential, oxygen consumption rate and adenosine-5'-triphosphate and mitochondrial Ca(2+) concentrations, were positively correlated with drug resistance of KMS cell lines. Mitochondrial genes including CYPD, SOD2 and MCU were differentially expressed in KMS cells. Thus, changes in the expression of these genes lead to changes in mitochondrial activity and in bortezomib susceptibility or resistance, and their combined effect contributes to differential sensitivity or resistance of MM cells to bortezomib. In support of this finding, coadministration of bortezomib and 2-methoxyestradiol, a SOD inhibitor, rendered KMS20 cells sensitive to apoptosis. Our results provide new insight into therapeutic modalities for MM patients. Studying mitochondrial activity and specific mitochondrial gene expression in fresh MM specimens might help predict resistance to proapoptotic chemotherapies and inform clinical decision-making.
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Affiliation(s)
- I S Song
- National Research Laboratory for Mitochondrial Signaling, Department of Physiology, College of Medicine, Cardiovascular and Metabolic Disease Center, Inje University, Busan, Korea
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14
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Zhao LP, Ji C, Lu PH, Li C, Xu B, Gao H. Oxygen glucose deprivation (OGD)/re-oxygenation-induced in vitro neuronal cell death involves mitochondrial cyclophilin-D/P53 signaling axis. Neurochem Res 2013; 38:705-13. [PMID: 23322110 DOI: 10.1007/s11064-013-0968-5] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2012] [Revised: 12/05/2012] [Accepted: 01/03/2013] [Indexed: 01/11/2023]
Abstract
Oxidative stress-induced neuronal cell death requires opening of the mitochondrial permeability transition pore. P53 mitochondrial translocation and association with Cyclophilin D (Cyp-D) is required for the pore opening. Here we tested this signaling axis in oxygen glucose deprivation (OGD)/re-oxygenation-induced in vitro neuronal death. Using mitochondrion immunoprecipitation, we found that p53 translocated to mitochondrion and associated with Cyp-D in SH-SY5Y cells exposed to (OGD)/re-oxygenation. Disruption of this complex by Cyp-D inhibitor Cyclosporine A (CsA), or by Cyp-D or p53 deficiency, significantly inhibited OGD/re-oxygenation-induced apoptosis-independent cell death. Conversely, over-expression of Cyp-D in SH-SY5Y cells caused spontaneous cell death, and these cells were more vulnerable to OGD/re-oxygenation. Finally, CsA or Cyp-D RNAi suppressed OGD/re-oxygenation-induced neuronal cell death in primary cultures. Together, our study suggests that OGD/re-oxygenation-induced in vitro cell death involves a mitochondrial Cyp-D/p53 signaling axis.
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Affiliation(s)
- Li-Ping Zhao
- State Key Laboratory of Reproductive Medicine, Department of Anesthesiology, Nanjing Maternity and Child Health Care Hospital Affiliated to Nanjing Medical University, 140 Hanzhong Road, Nanjing 210029, China
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15
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Bell RM, Kunuthur SP, Hendry C, Bruce-Hickman D, Davidson S, Yellon DM. Matrix metalloproteinase inhibition protects CyPD knockout mice independently of RISK/mPTP signalling: a parallel pathway to protection. Basic Res Cardiol 2013; 108:331. [PMID: 23361433 DOI: 10.1007/s00395-013-0331-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 01/17/2013] [Accepted: 01/18/2013] [Indexed: 12/11/2022]
Abstract
The mitochondrial permeability transition pore (mPTP) is widely accepted as an end-effector mechanism of conditioning protection against injurious ischaemia/reperfusion. However, death can be initiated in cells without pre-requisite mPTP opening, implicating alternate targets for ischaemia/reperfusion injury amelioration. Matrix metalloproteinases (MMP) are known to activate extrinsic apoptotic cascades and therefore we hypothesised that MMP activity represents an mPTP-independent target for augmented attenuation of ischaemia/reperfusion injury. In ex vivo and in vivo mouse hearts, we investigated whether the MMP inhibitor, ilomastat (0.25 μmol/l), administered upon reperfusion could engender protection in the absence of cyclophilin-D (CyPD), a modulator of mPTP opening, against injurious ischaemia/reperfusion. Ilomastat attenuated infarct size in wild-type (WT) animals [37 ± 2.8 to 22 ± 4.3 %, equivalent to ischaemic postconditioning (iPostC), used as positive control, 27 ± 2.1 %, p < 0.05]. Control CyPD knockout (KO) hearts had smaller infarcts than control WT (28 ± 4.2 %) and iPostC failed to confer additional protection, yet ilomastat significantly attenuated infarct size in KO hearts (11 ± 3.0 %, p < 0.001), and similar protection was also seen in isolated cardiomyocytes. Moreover, ilomastat, unlike the cyclophilin inhibitor cyclosporine-A, had no impact upon reactive oxygen species-mediated mPTP opening. While MMP inhibition was associated with increased Akt and ERK phosphorylation, neither Wortmannin nor PD98059 abrogated ilomastat-mediated protection. We demonstrate that MMP inhibition is cardioprotective, independent of Akt/ERK/CyPD/mPTP activity and is additive to the protection observed following inhibition of mPTP opening, indicative of a parallel pathway to protection in ischaemic/reperfused heart that may have clinical applicability in attenuating injury in acute coronary syndromes and deserve further investigation.
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Affiliation(s)
- Robert M Bell
- The Hatter Cardiovascular Institute, Institute of Cardiovascular Medicine, University College London, London, UK
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16
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Ma X, Song L, Yang Y, Liu D. A gain-of-function mutation in the ROC1 gene alters plant architecture in Arabidopsis. New Phytol 2013; 197:751-762. [PMID: 23206262 DOI: 10.1111/nph.12056] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Accepted: 10/21/2012] [Indexed: 05/20/2023]
Abstract
Plant architecture is an important agronomic trait and is useful for identification of plant species. The molecular basis of plant architecture, however, is largely unknown. Forward genetics was used to identify an Arabidopsis mutant with altered plant architecture. Using genetic and molecular approaches, we analyzed the roles of a mutated cyclophilin in the control of plant architecture. The Arabidopsis mutant roc1 has reduced stem elongation and increased shoot branching, and the mutant phenotypes are strongly affected by temperature and photoperiod. Map-based cloning and transgenic experiments demonstrated that the roc1 mutant phenotypes are caused by a gain-of-function mutation in a cyclophilin gene, ROC1. Besides, application of the plant hormone gibberellic acid (GA) further suppresses stem elongation in the mutant. GA treatment enhances the accumulation of mutated but not of wildtype (WT) ROC1 proteins. The roc1 mutation does not seem to interfere with GA biosynthesis or signaling. GA signaling, however, antagonizes the effect of the roc1 mutation on stem elongation. The altered plant architecture may result from the activation of an R gene by the roc1 protein. We also present a working model for the interaction between the roc1 mutation and GA signaling in regulating stem elongation.
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Affiliation(s)
- Xiqing Ma
- MOE Key Laboratory of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing, 100084, China
- School of Life Sciences, Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, China
| | - Li Song
- MOE Key Laboratory of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Yaxuan Yang
- MOE Key Laboratory of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Dong Liu
- MOE Key Laboratory of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing, 100084, China
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17
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Li B, Chauvin C, De Paulis D, De Oliveira F, Gharib A, Vial G, Lablanche S, Leverve X, Bernardi P, Ovize M, Fontaine E. Inhibition of complex I regulates the mitochondrial permeability transition through a phosphate-sensitive inhibitory site masked by cyclophilin D. Biochim Biophys Acta 2012; 1817:1628-34. [PMID: 22659400 DOI: 10.1016/j.bbabio.2012.05.011] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2012] [Revised: 05/15/2012] [Accepted: 05/24/2012] [Indexed: 01/16/2023]
Abstract
Inhibition of the mitochondrial permeability transition pore (PTP) has proved to be an effective strategy for preventing oxidative stress-induced cell death, and the pore represents a viable cellular target for drugs. Here, we report that inhibition of complex I by rotenone is more effective at PTP inhibition than cyclosporin A in tissues that express low levels of the cyclosporin A mitochondrial target, cyclophilin D; and, conversely, that tissues in which rotenone does not affect the PTP are characterized by high levels of expression of cyclophilin D and sensitivity to cyclosporin A. Consistent with a regulatory role of complex I in the PTP-inhibiting effects of rotenone, the concentrations of the latter required for PTP inhibition precisely match those required to inhibit respiration; and a similar effect is seen with the antidiabetic drug metformin, which partially inhibits complex I. Remarkably (i) genetic ablation of cyclophilin D or its displacement with cyclosporin A restored PTP inhibition by rotenone in tissues that are otherwise resistant to its effects; and (ii) rotenone did not inhibit the PTP unless phosphate was present, in striking analogy with the phosphate requirement for the inhibitory effects of cyclosporin A [Basso et al. (2008) J. Biol. Chem. 283, 26307-26311]. These results indicate that inhibition of complex I by rotenone or metformin and displacement of cyclophilin D by cyclosporin A affect the PTP through a common mechanism; and that cells can modulate their PTP response to complex I inhibition by modifying the expression of cyclophilin D, a finding that has major implications for pore modulation in vivo.
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Affiliation(s)
- Bo Li
- University Claude Bernard Lyon 1, Lyon, France
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18
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Zamorano S, Rojas-Rivera D, Lisbona F, Parra V, Court FA, Villegas R, Cheng EH, Korsmeyer SJ, Lavandero S, Hetz C. A BAX/BAK and cyclophilin D-independent intrinsic apoptosis pathway. PLoS One 2012; 7:e37782. [PMID: 22719850 PMCID: PMC3373601 DOI: 10.1371/journal.pone.0037782] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Accepted: 04/26/2012] [Indexed: 11/19/2022] Open
Abstract
Most intrinsic death signals converge into the activation of pro-apoptotic BCL-2 family members BAX and BAK at the mitochondria, resulting in the release of cytochrome c and apoptosome activation. Chronic endoplasmic reticulum (ER) stress leads to apoptosis through the upregulation of a subset of pro-apoptotic BH3-only proteins, activating BAX and BAK at the mitochondria. Here we provide evidence indicating that the full resistance of BAX and BAK double deficient (DKO) cells to ER stress is reverted by stimulation in combination with mild serum withdrawal. Cell death under these conditions was characterized by the appearance of classical apoptosis markers, caspase-9 activation, release of cytochrome c, and was inhibited by knocking down caspase-9, but insensitive to BCL-X(L) overexpression. Similarly, the resistance of BIM and PUMA double deficient cells to ER stress was reverted by mild serum withdrawal. Surprisingly, BAX/BAK-independent cell death did not require Cyclophilin D (CypD) expression, an important regulator of the mitochondrial permeability transition pore. Our results suggest the existence of an alternative intrinsic apoptosis pathway emerging from a cross talk between the ER and the mitochondria.
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Affiliation(s)
- Sebastián Zamorano
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile
- Center for Molecular Studies of the Cell, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Diego Rojas-Rivera
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile
- Center for Molecular Studies of the Cell, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Fernanda Lisbona
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile
- Center for Molecular Studies of the Cell, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Valentina Parra
- Center for Molecular Studies of the Cell, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
- Faculty of Chemical & Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - Felipe A. Court
- Millennium Nucleus for Regenerative Biology, Faculty of Biology, P. Catholic University of Chile, Santiago, Chile
| | - Rosario Villegas
- Millennium Nucleus for Regenerative Biology, Faculty of Biology, P. Catholic University of Chile, Santiago, Chile
| | - Emily H. Cheng
- Human Oncology and Pathogenesis Program, Memorial Sloan-Kettering Cancer Center, New York, New York, United States of America
| | - Stanley J. Korsmeyer
- Dana–Farber Cancer Institute, and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Sergio Lavandero
- Center for Molecular Studies of the Cell, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
- Faculty of Chemical & Pharmaceutical Sciences, University of Chile, Santiago, Chile
- Cardiology Division, Department of Internal medicine, University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - Claudio Hetz
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile
- Center for Molecular Studies of the Cell, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
- Harvard School of Public Health, Boston, Massachusetts, United States of America
- Neurounion Biomedical Foundation, Santiago, Chile
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19
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Abstract
Posttranscriptional gene silencing is mediated by RNA-induced silencing complexes (RISCs) that contain AGO proteins and single-stranded small RNAs. The assembly of plant AGO1-containing RISCs depends on the molecular chaperone HSP90. Here, we demonstrate that cyclophilin 40 (CYP40), protein phosphatase 5 (PP5), and several other proteins with the tetratricopeptide repeat (TPR) domain associates with AGO1 in an HSP90-dependent manner in extracts of evacuolated tobacco protoplasts (BYL). Intriguingly, CYP40, but not the other TPR proteins, could form a complex with small RNA duplex-bound AGO1. Moreover, CYP40 that was synthesized by in-vitro translation using BYL uniquely facilitated binding of small RNA duplexes to AGO1, and as a result, increased the amount of mature RISCs that could cleave target RNAs. CYP40 was not contained in mature RISCs, indicating that the association is transient. Addition of PP5 or cyclophilin-binding drug cyclosporine A prevented the association of endogenous CYP40 with HSP90-AGO1 complex and inhibited RISC assembly. These results suggest that a complex of AGO1, HSP90, CYP40, and a small RNA duplex is a key intermediate of RISC assembly in plants.
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Affiliation(s)
- Taichiro Iki
- Division of Plant Sciences, Plant–Microbe Interactions Research Unit, National Institute of Agrobiological Sciences (NIAS), Ibaraki, Japan
| | - Manabu Yoshikawa
- Division of Plant Sciences, Plant–Microbe Interactions Research Unit, National Institute of Agrobiological Sciences (NIAS), Ibaraki, Japan
- Japan Science and Technology Agency (JST), Precursory Research for Embryonic Science and Technology (PRESTO), Saitama, Japan
| | - Tetsuo Meshi
- Division of Plant Sciences, Plant–Microbe Interactions Research Unit, National Institute of Agrobiological Sciences (NIAS), Ibaraki, Japan
| | - Masayuki Ishikawa
- Division of Plant Sciences, Plant–Microbe Interactions Research Unit, National Institute of Agrobiological Sciences (NIAS), Ibaraki, Japan
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LoGuidice A, Boelsterli UA. Acetaminophen overdose-induced liver injury in mice is mediated by peroxynitrite independently of the cyclophilin D-regulated permeability transition. Hepatology 2011; 54:969-78. [PMID: 21626531 DOI: 10.1002/hep.24464] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2011] [Accepted: 05/11/2011] [Indexed: 12/07/2022]
Abstract
UNLABELLED Acetaminophen (APAP) is safe at therapeutic dosage but can cause severe hepatotoxicity if used at overdose. The mechanisms of injury are not yet fully understood, but previous reports had suggested that the mitochondrial permeability transition (mPT) may be involved in triggering hepatocellular necrosis. We aimed at inhibiting mitochondrial cyclophilin D (CypD), a key regulator of the mPT, as a potential therapeutic target in APAP hepatotoxicity. Wildtype mice treated with a high dose of APAP (600 mg/kg, intraperitoneal) developed typical centrilobular necrosis, which could not, however, be prevented by cotreatment with the selective CypD inhibitor, Debio 025 (alisporivir, DEB025, a nonimmunosuppressive cyclosporin A analog). Similarly, genetic ablation of mitochondrial CypD in Ppif-null mice did not afford protection from APAP hepatotoxicity. To determine whether APAP-induced peroxynitrite stress might directly activate mitochondrial permeabilization, independently of the CypD-regulated mPT, we coadministered the peroxynitrite decomposition catalyst Fe-TMPyP (10 mg/kg, intraperitoneal, 90 minutes prior to APAP) to CypD-deficient mice. Liver injury was greatly attenuated by Fe-TMPyP pretreatment, and mitochondrial 3-nitrotyrosine adduct levels (peroxynitrite marker) were decreased. Acetaminophen treatment increased both the cytosolic and mitochondria-associated P-JNK levels, but the c-jun-N-terminal kinase (JNK) signaling inhibitor SP600125 was hepatoprotective in wildtype mice only, indicating that the JNK pathway may not be critically involved in the absence of CypD. CONCLUSION These data support the concept that an overdose of APAP results in liver injury that is refractory to pharmacological inhibition or genetic depletion of CypD and that peroxynitrite-mediated cell injury predominates in the absence of CypD.
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Affiliation(s)
- Amanda LoGuidice
- University of Connecticut School of Pharmacy, Department of Pharmaceutical Sciences, Storrs, CT 06269-3092, USA
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21
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Feng D, Tang Y, Kwon H, Zong H, Hawkins M, Kitsis RN, Pessin JE. High-fat diet-induced adipocyte cell death occurs through a cyclophilin D intrinsic signaling pathway independent of adipose tissue inflammation. Diabetes 2011; 60:2134-43. [PMID: 21734017 PMCID: PMC3142076 DOI: 10.2337/db10-1411] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Accepted: 05/19/2011] [Indexed: 01/28/2023]
Abstract
OBJECTIVE Previous studies have demonstrated that mice fed a high-fat diet (HFD) develop insulin resistance with proinflammatory macrophage infiltration into white adipose tissue. Concomitantly, adipocytes undergo programmed cell death with the loss of the adipocyte-specific lipid droplet protein perilipin, and the dead/dying adipocytes are surrounded by macrophages that are organized into crown-like structures. This study investigated whether adipocyte cell death provides the driving signal for macrophage inflammation or if inflammation induces adipocyte cell death. RESEARCH DESIGN AND METHODS Two knockout mouse models were used: granulocyte/monocyte-colony stimulating factor (GM-CSF)-null mice that are protected against HFD-induced adipose tissue inflammation and cyclophilin D (CyP-D)-null mice that are protected against adipocyte cell death. Mice were fed for 4-14 weeks with a 60% HFD, and different markers of cell death and inflammation were analyzed. RESULTS HFD induced a normal extent of adipocyte cell death in GM-CSF-null mice, despite a marked reduction in adipose tissue inflammation. Similarly, depletion of macrophages by clodronate treatment prevented HFD-induced adipose tissue inflammation without any affect on adipocyte cell death. However, CyP-D deficiency strongly protected adipocytes from HFD-induced cell death, without affecting adipose tissue inflammation. CONCLUSIONS These data demonstrate that HFD-induced adipocyte cell death is an intrinsic cellular response that is CyP-D dependent but is independent of macrophage infiltration/activation.
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Affiliation(s)
- Daorong Feng
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York
| | - Yan Tang
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York
| | - Hyokjoon Kwon
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York
| | - Haihong Zong
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York
| | - Meredith Hawkins
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York
| | - Richard N. Kitsis
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York
- Wilf Family Cardiovascular Research Institute, Albert Einstein College of Medicine, Bronx, New York
| | - Jeffrey E. Pessin
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York
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22
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Park JS, Pasupulati R, Feldkamp T, Roeser NF, Weinberg JM. Cyclophilin D and the mitochondrial permeability transition in kidney proximal tubules after hypoxic and ischemic injury. Am J Physiol Renal Physiol 2011; 301:F134-50. [PMID: 21490135 PMCID: PMC3129895 DOI: 10.1152/ajprenal.00033.2011] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Accepted: 04/08/2011] [Indexed: 01/08/2023] Open
Abstract
Mitochondrial matrix cyclophilin D (CyPD) is known to promote development of the mitochondrial permeability transition (MPT). Kidney proximal tubule cells are especially prone to deleterious effects of mitochondrial damage because of their dependence on oxidative mitochondrial metabolism for ATP production. To clarify the role of CyPD and the MPT in proximal tubule injury during ischemia-reperfusion (I/R) and hypoxia-reoxygenation (H/R), we assessed freshly isolated tubules and in vivo injury in wild-type (WT) and Ppif(-/-) CyPD-null mice. Isolated mouse tubules developed a sustained, nonesterified fatty acid-mediated energetic deficit after H/R in vitro that could be substantially reversed by delipidated albumin and supplemental citric acid cycle substrates but was not modified by the absence of CyPD. Susceptibility of WT and Ppif(-/-) tubules to the MPT was increased by H/R but was less in normoxic and H/R Ppif(-/-) than WT tubules. Correction of the energetic deficit that developed during H/R strongly increased resistance to the MPT. Ppif(-/-) mice were resistant to I/R injury in vivo spanning a wide range of severity. The data clarify involvement of the MPT in oxygen deprivation-induced tubule cell injury by showing that the MPT does not contribute to the initial bioenergetic deficit produced by H/R but the deficit predisposes to subsequent development of the MPT, which contributes pathogenically to kidney I/R injury in vivo.
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Affiliation(s)
- Jeong Soon Park
- Nephrology Division, Dept. of Internal Medicine, Rm. 1560, MSRB II, University of Michigan Medical Center, Ann Arbor, MI 48109-0676, USA
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23
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Budinger GRS, Mutlu GM, Urich D, Soberanes S, Buccellato LJ, Hawkins K, Chiarella SE, Radigan KA, Eisenbart J, Agrawal H, Berkelhamer S, Hekimi S, Zhang J, Perlman H, Schumacker PT, Jain M, Chandel NS. Epithelial cell death is an important contributor to oxidant-mediated acute lung injury. Am J Respir Crit Care Med 2011; 183:1043-54. [PMID: 20959557 PMCID: PMC3086743 DOI: 10.1164/rccm.201002-0181oc] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2010] [Accepted: 10/15/2010] [Indexed: 01/11/2023] Open
Abstract
RATIONALE Acute lung injury and the acute respiratory distress syndrome are characterized by increased lung oxidant stress and apoptotic cell death. The contribution of epithelial cell apoptosis to the development of lung injury is unknown. OBJECTIVES To determine whether oxidant-mediated activation of the intrinsic or extrinsic apoptotic pathway contributes to the development of acute lung injury. METHODS Exposure of tissue-specific or global knockout mice or cells lacking critical components of the apoptotic pathway to hyperoxia, a well-established mouse model of oxidant-induced lung injury, for measurement of cell death, lung injury, and survival. MEASUREMENTS AND MAIN RESULTS We found that the overexpression of SOD2 prevents hyperoxia-induced BAX activation and cell death in primary alveolar epithelial cells and prolongs the survival of mice exposed to hyperoxia. The conditional loss of BAX and BAK in the lung epithelium prevented hyperoxia-induced cell death in alveolar epithelial cells, ameliorated hyperoxia-induced lung injury, and prolonged survival in mice. By contrast, Cyclophilin D-deficient mice were not protected from hyperoxia, indicating that opening of the mitochondrial permeability transition pore is dispensable for hyperoxia-induced lung injury. Mice globally deficient in the BH3-only proteins BIM, BID, PUMA, or NOXA, which are proximal upstream regulators of BAX and BAK, were not protected against hyperoxia-induced lung injury suggesting redundancy of these proteins in the activation of BAX or BAK. CONCLUSIONS Mitochondrial oxidant generation initiates BAX- or BAK-dependent alveolar epithelial cell death, which contributes to hyperoxia-induced lung injury.
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Affiliation(s)
- G. R. Scott Budinger
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Gökhan M. Mutlu
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Daniela Urich
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Saul Soberanes
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Leonard J. Buccellato
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Keenan Hawkins
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Sergio E. Chiarella
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Kathryn A. Radigan
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - James Eisenbart
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Hemant Agrawal
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Sara Berkelhamer
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Siegfried Hekimi
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Jianke Zhang
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Harris Perlman
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Paul T. Schumacker
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Manu Jain
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Navdeep S. Chandel
- Department of Medicine, Department of Cell and Molecular Biology, and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Biology, McGill University, Montreal, Quebec, Canada; and Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
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24
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Elrod JW, Wong R, Mishra S, Vagnozzi RJ, Sakthievel B, Goonasekera SA, Karch J, Gabel S, Farber J, Force T, Heller Brown J, Murphy E, Molkentin JD. Cyclophilin D controls mitochondrial pore-dependent Ca(2+) exchange, metabolic flexibility, and propensity for heart failure in mice. J Clin Invest 2010; 120:3680-7. [PMID: 20890047 PMCID: PMC2947235 DOI: 10.1172/jci43171] [Citation(s) in RCA: 299] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2010] [Accepted: 08/04/2010] [Indexed: 12/19/2022] Open
Abstract
Cyclophilin D (which is encoded by the Ppif gene) is a mitochondrial matrix peptidyl-prolyl isomerase known to modulate opening of the mitochondrial permeability transition pore (MPTP). Apart from regulating necrotic cell death, the physiologic function of the MPTP is largely unknown. Here we have shown that Ppif(-/-) mice exhibit substantially greater cardiac hypertrophy, fibrosis, and reduction in myocardial function in response to pressure overload stimulation than control mice. In addition, Ppif(-/-) mice showed greater hypertrophy and lung edema as well as reduced survival in response to sustained exercise stimulation. Cardiomyocyte-specific transgene expression of cyclophilin D in Ppif(-/-) mice rescued the enhanced hypertrophy, reduction in cardiac function, and rapid onset of heart failure following pressure overload stimulation. Mechanistically, the maladaptive phenotype in the hearts of Ppif(-/-) mice was associated with an alteration in MPTP-mediated Ca(2+) efflux resulting in elevated levels of mitochondrial matrix Ca(2+) and enhanced activation of Ca(2+)-dependent dehydrogenases. Elevated matrix Ca(2+) led to increased glucose oxidation relative to fatty acids, thereby limiting the metabolic flexibility of the heart that is critically involved in compensation during stress. These findings suggest that the MPTP maintains homeostatic mitochondrial Ca(2+) levels to match metabolism with alterations in myocardial workload, thereby suggesting a physiologic function for the MPTP.
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Affiliation(s)
- John W. Elrod
- Department of Pediatrics, University of Cincinnati, Cincinnati Children’s Hospital Medical Center, Howard Hughes Medical Institute, Cincinnati, Ohio, USA.
Translational Medicine Branch, National Heart, Lung, and Blood Institute, NIH, Bethesda, Maryland, USA.
Department of Pharmacology, University of California, San Diego, La Jolla, California, USA.
Center for Translational Medicine and Cardiology Division and
Department of Pathology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Renee Wong
- Department of Pediatrics, University of Cincinnati, Cincinnati Children’s Hospital Medical Center, Howard Hughes Medical Institute, Cincinnati, Ohio, USA.
Translational Medicine Branch, National Heart, Lung, and Blood Institute, NIH, Bethesda, Maryland, USA.
Department of Pharmacology, University of California, San Diego, La Jolla, California, USA.
Center for Translational Medicine and Cardiology Division and
Department of Pathology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Shikha Mishra
- Department of Pediatrics, University of Cincinnati, Cincinnati Children’s Hospital Medical Center, Howard Hughes Medical Institute, Cincinnati, Ohio, USA.
Translational Medicine Branch, National Heart, Lung, and Blood Institute, NIH, Bethesda, Maryland, USA.
Department of Pharmacology, University of California, San Diego, La Jolla, California, USA.
Center for Translational Medicine and Cardiology Division and
Department of Pathology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Ronald J. Vagnozzi
- Department of Pediatrics, University of Cincinnati, Cincinnati Children’s Hospital Medical Center, Howard Hughes Medical Institute, Cincinnati, Ohio, USA.
Translational Medicine Branch, National Heart, Lung, and Blood Institute, NIH, Bethesda, Maryland, USA.
Department of Pharmacology, University of California, San Diego, La Jolla, California, USA.
Center for Translational Medicine and Cardiology Division and
Department of Pathology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Bhuvana Sakthievel
- Department of Pediatrics, University of Cincinnati, Cincinnati Children’s Hospital Medical Center, Howard Hughes Medical Institute, Cincinnati, Ohio, USA.
Translational Medicine Branch, National Heart, Lung, and Blood Institute, NIH, Bethesda, Maryland, USA.
Department of Pharmacology, University of California, San Diego, La Jolla, California, USA.
Center for Translational Medicine and Cardiology Division and
Department of Pathology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Sanjeewa A. Goonasekera
- Department of Pediatrics, University of Cincinnati, Cincinnati Children’s Hospital Medical Center, Howard Hughes Medical Institute, Cincinnati, Ohio, USA.
Translational Medicine Branch, National Heart, Lung, and Blood Institute, NIH, Bethesda, Maryland, USA.
Department of Pharmacology, University of California, San Diego, La Jolla, California, USA.
Center for Translational Medicine and Cardiology Division and
Department of Pathology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Jason Karch
- Department of Pediatrics, University of Cincinnati, Cincinnati Children’s Hospital Medical Center, Howard Hughes Medical Institute, Cincinnati, Ohio, USA.
Translational Medicine Branch, National Heart, Lung, and Blood Institute, NIH, Bethesda, Maryland, USA.
Department of Pharmacology, University of California, San Diego, La Jolla, California, USA.
Center for Translational Medicine and Cardiology Division and
Department of Pathology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Scott Gabel
- Department of Pediatrics, University of Cincinnati, Cincinnati Children’s Hospital Medical Center, Howard Hughes Medical Institute, Cincinnati, Ohio, USA.
Translational Medicine Branch, National Heart, Lung, and Blood Institute, NIH, Bethesda, Maryland, USA.
Department of Pharmacology, University of California, San Diego, La Jolla, California, USA.
Center for Translational Medicine and Cardiology Division and
Department of Pathology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - John Farber
- Department of Pediatrics, University of Cincinnati, Cincinnati Children’s Hospital Medical Center, Howard Hughes Medical Institute, Cincinnati, Ohio, USA.
Translational Medicine Branch, National Heart, Lung, and Blood Institute, NIH, Bethesda, Maryland, USA.
Department of Pharmacology, University of California, San Diego, La Jolla, California, USA.
Center for Translational Medicine and Cardiology Division and
Department of Pathology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Thomas Force
- Department of Pediatrics, University of Cincinnati, Cincinnati Children’s Hospital Medical Center, Howard Hughes Medical Institute, Cincinnati, Ohio, USA.
Translational Medicine Branch, National Heart, Lung, and Blood Institute, NIH, Bethesda, Maryland, USA.
Department of Pharmacology, University of California, San Diego, La Jolla, California, USA.
Center for Translational Medicine and Cardiology Division and
Department of Pathology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Joan Heller Brown
- Department of Pediatrics, University of Cincinnati, Cincinnati Children’s Hospital Medical Center, Howard Hughes Medical Institute, Cincinnati, Ohio, USA.
Translational Medicine Branch, National Heart, Lung, and Blood Institute, NIH, Bethesda, Maryland, USA.
Department of Pharmacology, University of California, San Diego, La Jolla, California, USA.
Center for Translational Medicine and Cardiology Division and
Department of Pathology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Elizabeth Murphy
- Department of Pediatrics, University of Cincinnati, Cincinnati Children’s Hospital Medical Center, Howard Hughes Medical Institute, Cincinnati, Ohio, USA.
Translational Medicine Branch, National Heart, Lung, and Blood Institute, NIH, Bethesda, Maryland, USA.
Department of Pharmacology, University of California, San Diego, La Jolla, California, USA.
Center for Translational Medicine and Cardiology Division and
Department of Pathology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Jeffery D. Molkentin
- Department of Pediatrics, University of Cincinnati, Cincinnati Children’s Hospital Medical Center, Howard Hughes Medical Institute, Cincinnati, Ohio, USA.
Translational Medicine Branch, National Heart, Lung, and Blood Institute, NIH, Bethesda, Maryland, USA.
Department of Pharmacology, University of California, San Diego, La Jolla, California, USA.
Center for Translational Medicine and Cardiology Division and
Department of Pathology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
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25
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Giorgio V, Bisetto E, Soriano ME, Dabbeni-Sala F, Basso E, Petronilli V, Forte MA, Bernardi P, Lippe G. Cyclophilin D modulates mitochondrial F0F1-ATP synthase by interacting with the lateral stalk of the complex. J Biol Chem 2009; 284:33982-8. [PMID: 19801635 PMCID: PMC2797168 DOI: 10.1074/jbc.m109.020115] [Citation(s) in RCA: 235] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2009] [Revised: 09/02/2009] [Indexed: 01/02/2023] Open
Abstract
Blue native gel electrophoresis purification and immunoprecipitation of F(0)F(1)-ATP synthase from bovine heart mitochondria revealed that cyclophilin (CyP) D associates to the complex. Treatment of intact mitochondria with the membrane-permeable bifunctional reagent dimethyl 3,3-dithiobis-propionimidate (DTBP) cross-linked CyPD with the lateral stalk of ATP synthase, whereas no interactions with F(1) sector subunits, the ATP synthase natural inhibitor protein IF1, and the ATP/ADP carrier were observed. The ATP synthase-CyPD interactions have functional consequences on enzyme catalysis and are modulated by phosphate (increased CyPD binding and decreased enzyme activity) and cyclosporin (Cs) A (decreased CyPD binding and increased enzyme activity). Treatment of MgATP submitochondrial particles or intact mitochondria with CsA displaced CyPD from membranes and activated both hydrolysis and synthesis of ATP sustained by the enzyme. No effect of CsA was detected in CyPD-null mitochondria, which displayed a higher specific activity of the ATP synthase than wild-type mitochondria. Modulation by CyPD binding appears to be independent of IF1, whose association to ATP synthase was not affected by CsA treatment. These findings demonstrate that CyPD association to the lateral stalk of ATP synthase modulates the activity of the complex.
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Affiliation(s)
- Valentina Giorgio
- From the Department of Biomedical Sciences and the Consiglio Nazionale delle Ricerche Institute of Neuroscience and
| | - Elena Bisetto
- the Department of Biomedical Sciences, University of Udine, I-33100 Udine, Italy, and
| | - Maria Eugenia Soriano
- From the Department of Biomedical Sciences and the Consiglio Nazionale delle Ricerche Institute of Neuroscience and
| | - Federica Dabbeni-Sala
- the Department of Pharmacology and Anesthesiology, University of Padova, I-35121 Padova, Italy
| | - Emy Basso
- From the Department of Biomedical Sciences and the Consiglio Nazionale delle Ricerche Institute of Neuroscience and
| | - Valeria Petronilli
- From the Department of Biomedical Sciences and the Consiglio Nazionale delle Ricerche Institute of Neuroscience and
| | - Michael A. Forte
- the Vollum Institute, Oregon Health and Sciences University, Portland, Oregon 97239
| | - Paolo Bernardi
- From the Department of Biomedical Sciences and the Consiglio Nazionale delle Ricerche Institute of Neuroscience and
| | - Giovanna Lippe
- the Department of Biomedical Sciences, University of Udine, I-33100 Udine, Italy, and
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26
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Halestrap AP, Pasdois P. The role of the mitochondrial permeability transition pore in heart disease. Biochim Biophys Acta 2009; 1787:1402-15. [PMID: 19168026 DOI: 10.1016/j.bbabio.2008.12.017] [Citation(s) in RCA: 250] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2008] [Revised: 12/19/2008] [Accepted: 12/20/2008] [Indexed: 01/17/2023]
Abstract
Like Dr. Jeckyll and Mr. Hyde, mitochondria possess two distinct persona. Under normal physiological conditions they synthesise ATP to meet the energy needs of the beating heart. Here calcium acts as a signal to balance the rate of ATP production with ATP demand. However, when the heart is overloaded with calcium, especially when this is accompanied by oxidative stress, mitochondria embrace their darker side, and induce necrotic cell death of the myocytes. This happens acutely in reperfusion injury and chronically in congestive heart failure. Here calcium overload, adenine nucleotide depletion and oxidative stress combine forces to induce the opening of a non-specific pore in the mitochondrial membrane, known as the mitochondrial permeability transition pore (mPTP). The molecular nature of the mPTP remains controversial but current evidence implicates a matrix protein, cyclophilin-D (CyP-D) and two inner membrane proteins, the adenine nucleotide translocase (ANT) and the phosphate carrier (PiC). Inhibition of mPTP opening can be achieved with inhibitors of each component, but targeting CyP-D with cyclosporin A (CsA) and its non-immunosuppressive analogues is the best described. In animal models, inhibition of mPTP opening by either CsA or genetic ablation of CyP-D provides strong protection from both reperfusion injury and congestive heart failure. This confirms the mPTP as a promising drug target in human cardiovascular disease. Indeed, the first clinical trials have shown CsA treatment improves recovery after treatment of a coronary thrombosis with angioplasty.
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Affiliation(s)
- Andrew P Halestrap
- Department of Biochemistry and Bristol Heart Institute, University of Bristol, School of Medical Sciences, University Walk, Bristol BS8 1TD, UK.
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27
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van Dijk FS, Nesbitt IM, Zwikstra EH, Nikkels PG, Piersma SR, Fratantoni SA, Jimenez CR, Huizer M, Morsman AC, Cobben JM, van Roij MH, Elting MW, Verbeke JI, Wijnaendts LC, Shaw NJ, Högler W, McKeown C, Sistermans EA, Dalton A, Meijers-Heijboer H, Pals G. PPIB mutations cause severe osteogenesis imperfecta. Am J Hum Genet 2009; 85:521-7. [PMID: 19781681 PMCID: PMC2756556 DOI: 10.1016/j.ajhg.2009.09.001] [Citation(s) in RCA: 188] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2009] [Revised: 08/20/2009] [Accepted: 09/01/2009] [Indexed: 11/25/2022] Open
Abstract
Deficiency of cartilage-associated protein (CRTAP) or prolyl 3-hydroxylase 1(P3H1) has been reported in autosomal-recessive lethal or severe osteogenesis imperfecta (OI). CRTAP, P3H1, and cyclophilin B (CyPB) form an intracellular collagen-modifying complex that 3-hydroxylates proline at position 986 (P986) in the alpha1 chains of collagen type I. This 3-prolyl hydroxylation is decreased in patients with CRTAP and P3H1 deficiency. It was suspected that mutations in the PPIB gene encoding CyPB would also cause OI with decreased collagen 3-prolyl hydroxylation. To our knowledge we present the first two families with recessive OI caused by PPIB gene mutations. The clinical phenotype is compatible with OI Sillence type II-B/III as seen with COL1A1/2, CRTAP, and LEPRE1 mutations. The percentage of 3-hydroxylated P986 residues in patients with PPIB mutations is decreased in comparison to normal, but it is higher than in patients with CRTAP and LEPRE1 mutations. This result and the fact that CyPB is demonstrable independent of CRTAP and P3H1, along with reported decreased 3-prolyl hydroxylation due to deficiency of CRTAP lacking the catalytic hydroxylation domain and the known function of CyPB as a cis-trans isomerase, suggest that recessive OI is caused by a dysfunctional P3H1/CRTAP/CyPB complex rather than by the lack of 3-prolyl hydroxylation of a single proline residue in the alpha1 chains of collagen type I.
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Affiliation(s)
- Fleur S. van Dijk
- Department of Clinical Genetics, VU University Medical Centre, De Boelelaan 1117, P.O. box 7057, 1007 MB Amsterdam, The Netherlands
| | - Isabel M. Nesbitt
- Sheffield Molecular Genetics Service, Sheffield Children's National Health Service Foundation Trust, Sheffield Children's Hospital, Western Bank Sheffield, South Yorkshire, S10 2TH, United Kingdom
| | - Eline H. Zwikstra
- Department of Clinical Genetics, VU University Medical Centre, De Boelelaan 1117, P.O. box 7057, 1007 MB Amsterdam, The Netherlands
| | - Peter G.J. Nikkels
- Department of Pathology, University Medical Centre Utrecht, Heidelberglaan 100, P.O. box 85500, 3508 GA, Utrecht, the Netherlands
| | - Sander R. Piersma
- Oncoproteomics Laboratory, Department of Medical Oncology, VU University Medical Centre, De Boelelaan 1117, P.O. box 7057, 1007 MB Amsterdam, The Netherlands
| | - Silvina A. Fratantoni
- Oncoproteomics Laboratory, Department of Medical Oncology, VU University Medical Centre, De Boelelaan 1117, P.O. box 7057, 1007 MB Amsterdam, The Netherlands
| | - Connie R. Jimenez
- Oncoproteomics Laboratory, Department of Medical Oncology, VU University Medical Centre, De Boelelaan 1117, P.O. box 7057, 1007 MB Amsterdam, The Netherlands
| | - Margriet Huizer
- Department of Clinical Genetics, VU University Medical Centre, De Boelelaan 1117, P.O. box 7057, 1007 MB Amsterdam, The Netherlands
| | - Alice C. Morsman
- Sheffield Molecular Genetics Service, Sheffield Children's National Health Service Foundation Trust, Sheffield Children's Hospital, Western Bank Sheffield, South Yorkshire, S10 2TH, United Kingdom
| | - Jan M. Cobben
- Department of Pediatric genetics, Emma Children Hospital, Academic Medical Centre, Meibergdreef 9, P.O. box 22660, 1100 DD Amsterdam, the Netherlands
| | - Mirjam H.H. van Roij
- Department of Clinical Genetics, VU University Medical Centre, De Boelelaan 1117, P.O. box 7057, 1007 MB Amsterdam, The Netherlands
| | - Mariet W. Elting
- Department of Clinical Genetics, VU University Medical Centre, De Boelelaan 1117, P.O. box 7057, 1007 MB Amsterdam, The Netherlands
| | - Jonathan I.M.L. Verbeke
- Department of Radiology, VU University Medical Centre, De Boelelaan 1117, P.O. box 7057, 1007 MB Amsterdam, The Netherlands
| | - Liliane C.D. Wijnaendts
- Department of Pathology, VU University Medical Centre, De Boelelaan 1117, P.O. box 7057, 1007 MB Amsterdam, The Netherlands
| | - Nick J. Shaw
- Department of Pediatric Endocrinology, Birmingham Children's Hospital, Steelhouse Lane, Birmingham, West Midlands B4 6NH, United Kingdom
| | - Wolfgang Högler
- Department of Pediatric Endocrinology, Birmingham Children's Hospital, Steelhouse Lane, Birmingham, West Midlands B4 6NH, United Kingdom
| | - Carole McKeown
- West Midlands Regional Genetic Service, Birmingham Women's Hospital, Metchley Park Rd, Birmingham B15, United Kingdom
| | - Erik A. Sistermans
- Department of Clinical Genetics, VU University Medical Centre, De Boelelaan 1117, P.O. box 7057, 1007 MB Amsterdam, The Netherlands
| | - Ann Dalton
- Sheffield Molecular Genetics Service, Sheffield Children's National Health Service Foundation Trust, Sheffield Children's Hospital, Western Bank Sheffield, South Yorkshire, S10 2TH, United Kingdom
| | - Hanne Meijers-Heijboer
- Department of Clinical Genetics, VU University Medical Centre, De Boelelaan 1117, P.O. box 7057, 1007 MB Amsterdam, The Netherlands
| | - Gerard Pals
- Centre for Connective Tissue Research, Department of Clinical Genetics, VU University Medical Centre, De Boelelaan 1117, P.O. box 7057, 1007 MB Amsterdam, The Netherlands
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Abstract
Under conditions of mitochondrial calcium overload, especially when accompanied by oxidative stress, elevated phosphate concentrations and adenine nucleotide depletion, a non-specific pore, the mitochondrial permeability transition pore (MPTP), opens in the inner mitochondrial membrane. MPTP opening enables free passage into the mitochondria of molecules of <1.5 kDa including protons. The resulting uncoupling of oxidative phosphorylation leads to ATP depletion and necrotic cell death and it is now widely recognised that MPTP opening is a major cause of reperfusion injury and an effective target for cardioprotection. The properties of the MPTP are well defined, but despite extensive research in many laboratories, its exact molecular identity remains uncertain. Knockout studies have confirmed a role for cyclophilin-D (CyP-D), probably mediated by its peptidyl-prolyl cis-trans isomerase activity facilitating a conformational change of an inner membrane protein. However, the identity of the membrane component(s) remains controversial. Knockout studies have eliminated an essential role for either the voltage dependent anion channel (VDAC) or the adenine nucleotide translocase (ANT), although a regulatory role for the ANT was confirmed. Our own studies implicate the mitochondrial phosphate carrier (PiC) in MPTP formation and are consistent with a calcium-triggered conformational change of the PiC, facilitated by CyP-D, inducing pore opening. We propose that this is enhanced by an association of the PiC with the "c" conformation of the ANT. Agents that modulate pore opening may act on either or both the PiC and the ANT. However, knockdown and reconstitution studies are awaited to confirm or refute this model.
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Affiliation(s)
- Andrew P Halestrap
- Department of Biochemistry and Bristol Heart Institute, University of Bristol, School of Medical Sciences, University Walk, Bristol, UK.
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29
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Takeuchi H, Matano T. [Analysis of HIV replication and future HIV therapy]. Tanpakushitsu Kakusan Koso 2009; 54:947-952. [PMID: 21089522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
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30
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Chen G, Izzo J, Demizu Y, Wang F, Guha S, Wu X, Hung MC, Ajani JA, Huang P. Different redox states in malignant and nonmalignant esophageal epithelial cells and differential cytotoxic responses to bile acid and honokiol. Antioxid Redox Signal 2009; 11:1083-95. [PMID: 19187006 PMCID: PMC2842128 DOI: 10.1089/ars.2008.2321] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2008] [Revised: 01/09/2009] [Accepted: 01/11/2009] [Indexed: 12/25/2022]
Abstract
Esophageal adenocarcinoma (EAC) is a highly lethal cancer in western countries. EAC cells are believed to develop from esophageal epithelial cells through complex transformation processes involving inflammation and oxidative stress. The purpose of this study was to compare the redox status of malignant and nonmalignant esophageal epithelial cells and to test their responses to bile acid-induced oxidative stress and to treatment with honokiol (HNK), a natural product with anticancer activity. We demonstrated that esophageal adenocarcinoma cells express significantly higher levels of antioxidant molecules and were resistant to reactive oxygen species (ROS) stress induced by bile acid, but were sensitive to the cytotoxic action of HNK. Mechanistic study showed that HNK caused cancer cell death by disruption of mitochondrial transmembrane potential and was correlated with cyclophilin D (CypD) expression. Inhibition of CypD by cyclosporin A or abrogation of its expression by siRNA significantly suppressed the cytotoxicity of HNK, suggesting that CypD may be a key molecule that mediates the cytotoxicity. Our study suggests that the high antioxidant capacity in EAC cells confers on them the ability to survive the oxidative microenvironment in the reflux esophagus, and that HNK is a promising compound to kill the transformed cells preferentially.
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Affiliation(s)
- Gang Chen
- Department of Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Julie Izzo
- Department of Experimental Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Yusuke Demizu
- Department of Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Feng Wang
- Department of Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Sushovan Guha
- Department of Gastroenterology, Hepatology and Nutrition, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Xifeng Wu
- Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Mein-Chie Hung
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Jaffer A. Ajani
- Department GI Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Peng Huang
- Department of Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas
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31
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Smith MR, Willmann MR, Wu G, Berardini TZ, Möller B, Weijers D, Poethig RS. Cyclophilin 40 is required for microRNA activity in Arabidopsis. Proc Natl Acad Sci U S A 2009; 106:5424-9. [PMID: 19289849 PMCID: PMC2664006 DOI: 10.1073/pnas.0812729106] [Citation(s) in RCA: 129] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2008] [Indexed: 01/02/2023] Open
Abstract
Loss-of-function mutations of SQUINT (SQN)-which encodes the Arabidopsis orthologue of cyclophilin 40 (CyP40)-cause the precocious expression of adult vegetative traits, an increase in carpel number, and produce abnormal spacing of flowers in the inflorescence. Here we show that the vegetative phenotype of sqn is attributable to the elevated expression of miR156-regulated members of the SPL family of transcription factors and provide evidence that this defect is a consequence of a reduction in the activity of ARGONAUTE1 (AGO1). Support for this latter conclusion was provided by the phenotypic similarity between hypomorphic alleles of AGO1 and null alleles of SQN and by the genetic interaction between sqn and these alleles. Our results suggest that AGO1, or an AGO1-interacting protein, is a major client of CyP40 and that miR156 and its targets play a central role in the regulation of vegetative phase change in Arabidopsis.
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Affiliation(s)
- Michael R. Smith
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104; and
| | - Matthew R. Willmann
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104; and
| | - Gang Wu
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104; and
| | - Tanya Z. Berardini
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104; and
| | - Barbara Möller
- Laboratory of Biochemistry, Wageningen University, 6700 HB Wageningen, The Netherlands
| | - Dolf Weijers
- Laboratory of Biochemistry, Wageningen University, 6700 HB Wageningen, The Netherlands
| | - R. Scott Poethig
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104; and
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32
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Wang X, Carlsson Y, Basso E, Zhu C, Rousset CI, Rasola A, Johansson BR, Blomgren K, Mallard C, Bernardi P, Forte MA, Hagberg H. Developmental shift of cyclophilin D contribution to hypoxic-ischemic brain injury. J Neurosci 2009; 29:2588-96. [PMID: 19244535 PMCID: PMC3049447 DOI: 10.1523/jneurosci.5832-08.2009] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2008] [Accepted: 12/23/2008] [Indexed: 11/21/2022] Open
Abstract
Cyclophilin D (CypD), a regulator of the mitochondrial membrane permeability transition pore (PTP), enhances Ca(2+)-induced mitochondrial permeabilization and cell death in the brain. However, the role of CypD in hypoxic-ischemic (HI) brain injury at different developmental ages is unknown. At postnatal day (P) 9 or P60, littermates of CypD-deficient [knock-out (KO)], wild-type (WT), and heterozygous mice were subjected to HI, and brain injury was evaluated 7 d after HI. CypD deficiency resulted in a significant reduction of HI brain injury at P60 but worsened injury at P9. After HI, caspase-dependent and -independent cell death pathways were more induced in P9 CypD KO mice than in WT controls, and apoptotic activation was minimal at P60. The PTP had a considerably higher induction threshold and lower sensitivity to cyclosporin A in neonatal versus adult mice. On the contrary, Bax inhibition markedly reduced caspase activation and brain injury in immature mice but was ineffective in the adult brain. Our findings suggest that CypD/PTP is critical for the development of brain injury in the adult, whereas Bax-dependent mechanisms prevail in the immature brain. The role of CypD in HI shifts from a predominantly prosurvival protein in the immature to a cell death mediator in the adult brain.
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Affiliation(s)
- Xiaoyang Wang
- Perinatal Center, University of Gothenburg, SE-405 30 Gothenburg, Sweden.
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33
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Tazawa H, Fujita C, Machida K, Osada H, Ohta Y. Involvement of cyclophilin D in mitochondrial permeability transition induction in intact cells. Arch Biochem Biophys 2009; 481:59-64. [PMID: 18996353 DOI: 10.1016/j.abb.2008.10.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2008] [Revised: 10/22/2008] [Accepted: 10/23/2008] [Indexed: 11/28/2022]
Abstract
The mitochondrial permeability transition (MPT) is involved in both Ca(2+) signaling and cell death. The present study aimed to clarify the involvement of cyclophilin D, a peptidyl prolyl cis-trans isomerase (PPIase), in MPT induction in intact cells. To achieve this, we used C6 cells overexpressing wild-type or PPIase-deficient cyclophilin D, and measured the inner mitochondrial membrane permeability to calcein, a 623-Da hydrophilic fluorescent molecule, to evaluate MPT induction. In vector control cells, the percentage of MPT induction by ionomycin increased as the Ca(2+) concentration in the extracellular medium increased. This result indicates that the present method is valid for numerical evaluation of MPT induction. In C6 cells expressing the PPIase-deficient mutant, the percentage of MPT induction was significantly decreased compared with wild-type CypD-overexpressing cells or vector control cells. These results suggest that cyclophilin D is involved in MPT induction by Ca(2+) in intact cells.
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Affiliation(s)
- Hidejiro Tazawa
- Division of Biotechnology and Life Science, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology, Nakacho 2-24-16, Koganei, Tokyo, Japan
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34
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Cho EK, Kim M. A red algal cyclophilin has an effect on development and growth in Nicotiana tabacum. Plant Physiol Biochem 2008; 46:868-74. [PMID: 18603440 DOI: 10.1016/j.plaphy.2008.05.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2008] [Revised: 05/18/2008] [Accepted: 05/19/2008] [Indexed: 05/20/2023]
Abstract
In this study, an algal Cyp was introduced into plant to research the effect of the gene on growth and development. cDNA GjCyp-1 was isolated from the red alga (Griffithsia japonica), and a recombinant GjCyp-1 containing a CaMV35S promoter at the amino-terminus was constructed in Nicotiana tabacum. The altered GjCyp-1 levels in plants and the expression pattern of Cyp after hormone treatment were confirmed by RNA blotting. Transcript of GjCyp-1 was induced by plant hormones such as gibberellic acid (GA(3)), indoleacetic acid (IAA), and zeatin (ZA). Constitutive overexpression of GjCyp-1 appeared to be beneficial to seed germination. The ratio of emergence of cotyledon from seeds overexpressing GjCyp-1 was almost three times higher than that of the transgenic seeds carrying only the vector. In addition, it was found that most of the seedlings overexpressing GjCyp-1 were dwarfs with altered root systems. The ratio of leaf length and width and root length from transgenic seedlings overexpressing GjCyp-1 was almost 2 and 3.5 times lower than that of the transgenic seedlings carrying only the vector, respectively. The data in this study suggest that GjCyp-1 may affect development and growth in organisms.
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Affiliation(s)
- Eun Kyung Cho
- Department of Bio-Food Materials, College of Medical Life Science, Silla University, Busan, Republic of Korea.
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35
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Kaplan JC. [In mito veritas?]. Med Sci (Paris) 2008; 24:470-2. [PMID: 18466722 DOI: 10.1051/medsci/2008245470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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36
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Juhaszova M, Wang S, Zorov DB, Nuss HB, Gleichmann M, Mattson MP, Sollott SJ. The identity and regulation of the mitochondrial permeability transition pore: where the known meets the unknown. Ann N Y Acad Sci 2008; 1123:197-212. [PMID: 18375592 DOI: 10.1196/annals.1420.023] [Citation(s) in RCA: 111] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The mitochondrial permeability transition (MPT) pore complex is a key participant in the machinery that controls mitochondrial fate and, consequently, cell fate. The quest for the pore identity has been ongoing for several decades and yet the main structure remains unknown. Established "dogma" proposes that the core of the MPT pore is composed of an association of voltage-dependent anion channel (VDAC) and adenine nucleotide translocase (ANT). Recent genetic knockout experiments contradict this commonly accepted interpretation and provide a basis for substantial revision of the MPT pore identity. There is now sufficient evidence to exclude VDAC and ANT as the main pore structural components. Regarding MPT pore regulation, the role of cyclophilin D is confirmed and ANT may still serve some regulatory function, although the involvement of hexokinase II and creatine kinase remains unresolved. When cell protection signaling pathways are activated, we have found that the Bcl-2 family members relay the signal from glycogen synthase kinase-3 beta onto a target at or in close proximity to the pore. Our experimental findings in intact cardiac myocytes and neurons indicate that the current "dogma" related to the role of Ca2+ in MPT induction requires reevaluation. Emerging evidence suggests that after injury-producing stresses, reactive oxygen species (but not Ca2+) are largely responsible for the pore induction. In this article we discuss the current state of knowledge and provide new data related to the MPT pore structure and regulation.
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Affiliation(s)
- Magdalena Juhaszova
- Laboratory of Cardiovascular Science, Gerontology Research Center, Intramural Research Program, National Institute on Aging, NIH, Baltimore, MD 21224-6825, USA
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37
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Lu C, Armstrong JS. Role of calcium and cyclophilin D in the regulation of mitochondrial permeabilization induced by glutathione depletion. Biochem Biophys Res Commun 2007; 363:572-7. [PMID: 17888874 DOI: 10.1016/j.bbrc.2007.08.196] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2007] [Accepted: 08/17/2007] [Indexed: 01/08/2023]
Abstract
The mitochondrial permeability transition (MPT) is a calcium and oxidative stress sensitive transition in the permeability of the mitochondrial inner membrane that plays a crucial role in cell death. However, the mechanism regulating the MPT remains controversial. To study the role of oxidative stress in the regulation of the MPT, we used diethyl maleate (DEM) to deplete glutathione (GSH) in human leukemic CEM cells. GSH depletion increased mitochondrial calcium and reactive oxygen species (ROS) levels in a co-dependent manner causing loss of mitochondrial membrane potential (deltapsi(m)) and cell death. These events were inhibited by the calcium chelator BAPTA-AM and the antioxidants N-acetylcysteine (NAC) and the triphenyl phosphonium-linked ubiquinone derivative MitoQ. In contrast, the MPT inhibitor cyclosporine A (CsA) and small interference RNA (siRNA) knockdown of cyclophilin D (Cyp-D) were not protective. These results indicate that mitochondrial permeabilization induced by GSH depletion is not regulated by the classical MPT.
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Affiliation(s)
- C Lu
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, 8 Medical Drive, Singapore 117597, Singapore
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38
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Fu A, He Z, Cho HS, Lima A, Buchanan BB, Luan S. A chloroplast cyclophilin functions in the assembly and maintenance of photosystem II in Arabidopsis thaliana. Proc Natl Acad Sci U S A 2007; 104:15947-52. [PMID: 17909185 PMCID: PMC2000425 DOI: 10.1073/pnas.0707851104] [Citation(s) in RCA: 132] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2007] [Indexed: 11/18/2022] Open
Abstract
Photosynthetic light reactions rely on the proper function of large protein complexes (including photosystems I and II) that reside in the thylakoid membrane. Although their composition, structure, and function are known, the repertoire of assembly and maintenance factors is still being determined. Here we show that an immunophilin of the cyclophilin type, CYP38, plays a critical role in the assembly and maintenance of photosystem II (PSII) supercomplexes (SCs) in Arabidopsis. Mutant plants with the CYP38 gene interrupted by T-DNA insertion showed stunted growth and were hypersensitive to high light. Leaf chlorophyll fluorescence analysis and thylakoid membrane composition indicated that cyp38 mutant plants had defects in PSII SCs. Sucrose supplementation enabled the rescue of the mutant phenotype under low-light conditions, but failed to mitigate hypersensitivity to high-light stress. Protein radiolabeling assays showed that, although individual thylakoid proteins were synthesized equally in mutant and wild type, the assembly of the PSII SC was impaired in the mutant. In addition, the D1 and D2 components of the mutant PSII had a short half-life under high-light stress. The results provide evidence that CYP38 is necessary for the assembly and stabilization of PSII.
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Affiliation(s)
- Aigen Fu
- Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720
| | - Zengyong He
- Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720
| | - Hye Sun Cho
- Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720
| | - Amparo Lima
- Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720
| | - Bob B. Buchanan
- Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720
| | - Sheng Luan
- Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720
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39
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Eliseev RA, Filippov G, Velos J, VanWinkle B, Goldman A, Rosier RN, Gunter TE. Role of cyclophilin D in the resistance of brain mitochondria to the permeability transition. Neurobiol Aging 2007; 28:1532-42. [PMID: 16876914 DOI: 10.1016/j.neurobiolaging.2006.06.022] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2006] [Revised: 05/12/2006] [Accepted: 06/23/2006] [Indexed: 11/26/2022]
Abstract
The mitochondrial permeability transition (MPT) is involved in both necrosis and apoptosis. Cyclophilin D (CypD) is an important component of the MPT. Brain mitochondria are more resistant to the MPT when compared to heart or liver mitochondria. We found that this increased resistance correlates with low expression of CypD in brain when compared to heart or liver. In newborn rats, sensitivity of brain mitochondria to the MPT and CypD expression are significantly higher than in mature animals. In an in vitro model of neuronal development, mitochondria in differentiated neuronal-like cells exert a higher calcium threshold toward MPT induction and express significantly less CypD when compared to undifferentiated precursor cells. Gain and loss of function experiments confirm the role of CypD in sensitivity to the MPT. Together our data indicate that the increased calcium threshold of brain mitochondria to the MPT correlates with low expression of CypD in brain; and that neuronal cells lose CypD during differentiation and become less sensitive to the MPT induction. This may be a protection mechanism that raises the threshold of brain tissue against injuries.
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Affiliation(s)
- Roman A Eliseev
- Musculoskeletal Research Center, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, United States. roman
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40
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Watashi K. [Regulation mechanism of hepatitis C virus replication]. Tanpakushitsu Kakusan Koso 2007; 52:1139-43. [PMID: 17824230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Affiliation(s)
- Koichi Watashi
- National Institute of Allergy and Infectious Disease, USA.
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41
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Kawasaki H, Mocarski ES, Kosugi I, Tsutsui Y. Cyclosporine inhibits mouse cytomegalovirus infection via a cyclophilin-dependent pathway specifically in neural stem/progenitor cells. J Virol 2007; 81:9013-23. [PMID: 17553872 PMCID: PMC1951393 DOI: 10.1128/jvi.00261-07] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The potential of neural stem and progenitor cell (NSPC) transplantation in neurodegenerative disease raises a concern about immunosuppressive agents and opportunistic neurotropic pathogens that may interfere with engraftment. Cytomegalovirus (CMV) is an important opportunistic pathogen infecting the central nervous system, where it may remain latent for life, following transplacental transmission. Cyclosporine (Cs), an immunosuppressive drug used in organ transplantation, where its use is associated with CMV reactivation, suppressed murine CMV (MCMV) infection in cultured NSPCs but not in fibroblasts. This activity of Cs appears to be mediated via cyclophilin (CyP) rather than via calcineurin. First, the calcineurin-specific inhibitor FK506 failed to suppress replication. Second, the CyP-specific inhibitor NIM811 strongly suppressed replication in NSPC. NSPCs maintained in the presence of NIM811 retained viral genomes for several weeks without detectable viral gene expression or obvious deleterious effects. The withdrawal of NIM811 reactivated viral replication, suggesting that the inhibitory mechanism was reversible. Finally, inhibition of endogenous CyP A (CyPA) by small interfering RNA also inhibited replication in NSPCs. These results show that MCMV replication depends upon cellular CyPA pathways in NSPCs (in a specific cell type-dependent fashion), that CyPA plays an important role in viral infection in this cell type, and that inhibition of viral replication via CyP leads to persistence of the viral genome without cell damage. Further, the calcineurin-signaling pathway conferring immunosuppression in T cells does not influence viral replication in a detectable fashion.
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Affiliation(s)
- Hideya Kawasaki
- Department of Pathology, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu 431-3192, Japan.
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Chen AP, Wang GL, Qu ZL, Lu CX, Liu N, Wang F, Xia GX. Ectopic expression of ThCYP1, a stress-responsive cyclophilin gene from Thellungiella halophila, confers salt tolerance in fission yeast and tobacco cells. Plant Cell Rep 2007; 26:237-45. [PMID: 16972091 DOI: 10.1007/s00299-006-0238-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2006] [Revised: 08/19/2006] [Accepted: 08/24/2006] [Indexed: 05/11/2023]
Abstract
The halophyte Thellungiella halophila (salt cress) is an ideal model system for studying the molecular mechanisms of salinity tolerance in plants. Herein, we report the identification of a stress-responsive cyclophilin gene (ThCYP1) from T. halophila, using fission yeast as a functional system. The expression of ThCYP1 is highly inducible by salt, abscisic acid (ABA), H(2)O(2) and heat shock. Ectopic overexpression of the ThCYP1 gene enhance the salt tolerance capacity of fission yeast and tobacco (Nicotiana tabacum L.) cv. Bright Yellow 2 (BY-2) cells significantly. ThCYP1 is expressed constitutively in roots, stems, leaves and flowers, with higher expression occurring in the roots and flowers. The ThCYP1 proteins are distributed widely within the cell, but are enriched significantly in the nucleus. The present results suggest that ThCYP1 may participate in response to stresses in the salt cress, perhaps by regulating appropriate folding of certain stress-related proteins, or in the signal transduction processes.
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Affiliation(s)
- An-Ping Chen
- National Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
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Abstract
Necrosis has been defined as a type of cell death that lacks the features of apoptosis and autophagy, and is usually considered to be uncontrolled. Recent research suggests, however, that its occurrence and course might be tightly regulated. After signaling- or damage-induced lesions, necrosis can include signs of controlled processes such as mitochondrial dysfunction, enhanced generation of reactive oxygen species, ATP depletion, proteolysis by calpains and cathepsins, and early plasma membrane rupture. In addition, the inhibition of specific proteins involved in regulating apoptosis or autophagy can change the type of cell death to necrosis. Because necrosis is prominent in ischemia, trauma and possibly some forms of neurodegeneration, further biochemical comprehension and molecular definition of this process could have important clinical implications.
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Affiliation(s)
- Pierre Golstein
- Centre d'Immunologie de Marseille-Luminy, Université de la Méditerranée, Case 906, 13288 Marseille Cedex 9, France
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De Marchi U, Basso E, Szabò I, Zoratti M. Electrophysiological characterization of the Cyclophilin D-deleted mitochondrial permeability transition pore. Mol Membr Biol 2006; 23:521-30. [PMID: 17127624 DOI: 10.1080/09687860600907644] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Mitochondria isolated from engineered mice lacking Cyclophilin D (CypD), a component of the Permeability Transition Pore (PTP) complex, can still undergo a Ca2+ -dependent but Cyclosporin A-insensitive permeabilization of the inner membrane. Higher Ca2+ concentrations are required than for wild-type controls. The characteristics of the pore formed in this system were not known, and it has been proposed that they might differ substantially from those of the normal PTP. To test this hypothesis, we have characterized the PTP of isogenic wild-type and CypD- mouse liver mitochondria in patch clamp experiments, which allow biophysical characterization. The pores observed in the two cases, very similar to those of rat liver mitochondria, are indistinguishable according to a number of criteria. The only clear difference is in their sensitivity to Cyclosporin A. CypD is thus shown to be an auxiliary, modulatory component of the "standard" PTP, which forms and has essentially the same properties even in its absence. The observations suggest that Ca2+, CypD, and presumably other inducers and inhibitors act at the level of an activation or assembly process. Activation is separate and upstream of the gating observable on a short or medium-term time scale. Once the pore is activated, its molecular dynamics and biophysical properties may thus be predicted not to depend on the details of the induction process.
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Affiliation(s)
- Umberto De Marchi
- Department of Experimental Biomedical Sciences, University of Padova, Padova, Italy
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Yasuda O, Fukuo K, Sun X, Nishitani M, Yotsui T, Higuchi M, Suzuki T, Rakugi H, Smithies O, Maeda N, Ogihara T. Apop-1, a novel protein inducing cyclophilin D-dependent but Bax/Bak-related channel-independent apoptosis. J Biol Chem 2006; 281:23899-907. [PMID: 16782708 DOI: 10.1074/jbc.m512610200] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In the intrinsic pathway of apoptosis, mitochondria play a crucial role by releasing cytochrome c from the intermembrane space into the cytoplasm. Cytochrome c release through Bax/Bak-dependent channels in mitochondria has been well documented. In contrast, cyclophilin D (CypD), an important component of permeability transition pore-dependent protein release, remains largely undefined, and no apoptogenic proteins that act specifically in a CypD-dependent manner have been reported to date. Here, we describe a novel and evolutionarily conserved protein, apoptogenic protein (Apop). Mouse Apop-1 expression induces apoptotic death by releasing cytochrome c from mitochondria into the cytosolic space followed by activation of caspase-9 and -3. Apop-1-induced apoptosis is not blocked by Bcl-2 or Bcl-xL, inhibitors of Bax/Bak-dependent channels, whereas it is completely blocked by cyclosporin A, an inhibitor of permeability transition pore. Cells lacking CypD were resistant to Apop-induced apoptosis. Moreover, inhibition of Apop expression prevented the cell death induced by apoptosis-inducing substances. Our findings, thus, indicate that the expression of Apop-1 induces apoptosis though CypD-dependent pathway and that Apop-1 plays roles in cell death under physiological conditions.
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Affiliation(s)
- Osamu Yasuda
- Department of Geriatric Medicine, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
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Machida K, Ohta Y, Osada H. Suppression of apoptosis by cyclophilin D via stabilization of hexokinase II mitochondrial binding in cancer cells. J Biol Chem 2006; 281:14314-20. [PMID: 16551620 DOI: 10.1074/jbc.m513297200] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The permeability transition pore is involved in the mitochondrial pathway of apoptosis. Cyclophilin D, a pore component, has catalytic activity as a peptidyl prolyl cis, trans-isomerase (PPIase), which is essential to the pore opening. It has been reported that cyclophilin D overexpression suppresses apoptosis in cancer cells. To clarify the mechanism of this effect, we generated glioma cells overexpressing wild-type or a PPIase-deficient mutant of cyclophilin D. Interestingly, we found that the PPIase-dependent apoptosis suppression by cyclophilin D correlated with the amounts of mitochondrial-bound hexokinase II, which has anti-apoptotic activity. Inactivation of endogenous cyclophilin D by small interference RNA or a cyclophilin inhibitor was found to release hexokinase II from mitochondria and to enhance Bax-mediated apoptosis. The anti-apoptotic effects of cyclophilin D were canceled out by the detachment of hexokinase II from mitochondria, demonstrating that mitochondrial binding of hexokinase II is essential to the apoptosis suppression by cyclophilin D. Furthermore, cyclophilin D dysfunction appears to abrogate hexokinase II-mediated apoptosis suppression, indicating that cyclophilin D is required for the anti-apoptotic activity of hexokinase II. Based on the above, we propose here that cyclophilin D suppresses apoptotic cell death via a mitochondrial hexokinase II-dependent mechanism in cancer cells.
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Affiliation(s)
- Kiyotaka Machida
- Antibiotics Laboratory, Discovery Research Institute, RIKEN, Hirosawa 2-1, Saitama 351-0198, Japan
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Jordens J, Janssens V, Longin S, Stevens I, Martens E, Bultynck G, Engelborghs Y, Lescrinier E, Waelkens E, Goris J, Van Hoof C. The protein phosphatase 2A phosphatase activator is a novel peptidyl-prolyl cis/trans-isomerase. J Biol Chem 2006; 281:6349-57. [PMID: 16380387 DOI: 10.1074/jbc.m507760200] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The protein phosphatase 2A (PP2A) phosphatase activator (PTPA) is an essential protein involved in the regulation of PP2A and the PP2A-like enzymes. In this study we demonstrate that PTPA and its yeast homologues Ypa1 and Ypa2 can induce a conformational change in some model substrates. Using these model substrates in different assays with and without helper proteases, this isomerase activity is similar to the isomerase activity of FKBP12, the human cyclophilin A, and one of its yeast homologs Cpr7 but dissimilar to the isomerase activity of Pin1. However, neither FKBP12 nor Cpr7 can reactivate the inactive form of PP2A. Therefore, PTPA belongs to a novel peptidyl-prolyl cis/trans-isomerase (PPIase) family. The PPIase activity of PTPA correlates with its activating activity since both are stimulated by the presence of Mg2+ATP, and a PTPA mutant (Delta208-213) with 400-fold less activity in the activation reaction of PP2A also showed almost no PPIase activity. The point mutant Asp205 --> Gly (in Ypa1) identified this amino acid as essential for both activities. Moreover, PTPA dissociates the inactive form from the complex with the PP2A methylesterase. Finally, Pro190 in the catalytic subunit of PP2A (PP2AC) could be identified as the target Pro isomerized by PTPA/Mg2+ATP since among the 14 Pro residues present in 12 synthesized peptides representing the microenvironments of these prolines in PP2AC, only Pro190 could be isomerized by PTPA/Mg2+ATP. This Pro190 is present in a predicted loop structure near the catalytic center of PP2AC and, if mutated into a Phe, the phosphatase is inactive and can no longer be activated by PTPA/Mg2+ATP.
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Affiliation(s)
- Jan Jordens
- Afdeling Biochemie, Faculteit Geneeskunde, Katholieke Universiteit Leuven, Campus Gasthuisberg, Herestraat 49, B-3000 Leuven, Belgium
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Abstract
Peptide bond isomerases are involved in important physiological processes that can be targeted in order to treat neurodegenerative disease, cancer, diseases of the immune system, allergies, and many others. The folding helper enzyme class of Peptidyl-Prolyl-cis/trans Isomerases (PPIases) contains the three enzyme families of cyclophilins (Cyps), FK506 binding proteins (FKBPs), and parvulins (Pars). Although they are structurally unrelated, all PPIases catalyze the cis/trans isomerization of the peptide bond preceding the proline in a polypeptide chain. This process not only plays an important role in de novo protein folding, but also in isomerization of native proteins. The native state isomerization plays a role in physiological processes by influencing receptor ligand recognition or isomer-specific enzyme reaction or by regulating protein function by catalyzing the switch between native isomers differing in their activity, e.g., ion channel regulation. Therefore elucidating PPIase involvement in physiological processes and development of specific inhibitors will be a suitable attempt to design therapies for fatal and deadly diseases.
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Affiliation(s)
- F Edlich
- Max-Planck Research Unit for Enzymology of Protein Folding, Halle/Saale, Germany
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49
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Abstract
Viruses depend on host-derived factors for their efficient genome replication. Here, we demonstrate that a cellular peptidyl-prolyl cis-trans isomerase (PPIase), cyclophilin B (CyPB), is critical for the efficient replication of the hepatitis C virus genome. CyPB interacted with the HCV RNA polymerase NS5B to directly stimulate its RNA binding activity. Both the RNA interference (RNAi)-mediated reduction of endogenous CyPB expression and the induced loss of NS5B binding to CyPB decreased the levels of HCV replication. Thus, CyPB functions as a stimulatory regulator of NS5B in HCV replication machinery. This regulation mechanism for viral replication identifies CyPB as a target for antiviral therapeutic strategies.
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Affiliation(s)
- Charles M Rice
- Center for the Study of Hepatitis C Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, NY, USA
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50
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Affiliation(s)
- N Zamzami
- CNRS-UMR8125, Laboratoire de Génomique Cellulaire des Cancers, Institut Gustave Roussy, 39 rue Camille-Desmoulins, F-94805 Villejuif, France
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