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Skrzymowska J, Zalas M, Goszczyński TM, Miazek A. An alpha II spectrin mutant peptide with unstable scaffold structure and increased sensitivity to calpain cleavage. Biochem Biophys Res Commun 2021; 581:68-73. [PMID: 34656850 DOI: 10.1016/j.bbrc.2021.10.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Accepted: 10/05/2021] [Indexed: 10/20/2022]
Abstract
A spontaneous missense mutation in the alpha II spectrin (αII) gene, replacing a highly conserved arginine 1098 with the glutamine (R1098Q), causes progressive neurodegeneration in heterozygous mutant mice. The molecular mechanism underlying this phenotype is unknown but the accumulation of 150kD αII breakdown products in brains of homozygous mutant embryos suggests an imbalance in the substrate level control of αII cleavage by calpains. This is further supported by in silico simulation predicting unmasked calpain target site and increased spectrin scaffold bending and flexibility of R1098Q mutant peptide. Here, using spectroscopic and in situ enzymatic techniques, we aimed at obtaining direct experimental support for the impact of R1098Q mutation on the αII stability and its propensity for calpain-mediated degradation. Thermal circular dichroism analyses performed on recombinant wildtype and R1098Q mutant αII peptides, composed of spectrin repeat 9-10 revealed that although both had very similar secondary structure contents, thermal stability curve profiles varied and the observed midpoint of the unfolding transition (Tm) was 5.5 °C lower for the R1098Q peptide. Yet, the dynamic light scattering profiles of both peptides closely overlapped, implying the same thermal propensity to aggregate. Calpain digestion of plate-bound αII peptides with and without added calmodulin revealed an enhancement of the R1098Q peptide digestion rate relative to WT control. In summary, these results support the unstable scaffold structure of the R1098Q peptide as contributing to its enhanced intrinsic sensitivity to calpain and suggest physiologic relevance of a proper calpain/spectrin balance in preventing neurodegeneration.
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Affiliation(s)
- Joanna Skrzymowska
- Department of Tumor Immunology, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Weigla 12, 53-114, Wroclaw, Poland
| | - Michał Zalas
- Department of Tumor Immunology, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Weigla 12, 53-114, Wroclaw, Poland
| | - Tomasz M Goszczyński
- Department of Experimental Oncology, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Weigla 12, 53-114, Wroclaw, Poland
| | - Arkadiusz Miazek
- Department of Tumor Immunology, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Weigla 12, 53-114, Wroclaw, Poland.
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Davidson MT, Grimsrud PA, Lai L, Draper JA, Fisher-Wellman KH, Narowski TM, Abraham DM, Koves TR, Kelly DP, Muoio DM. Extreme Acetylation of the Cardiac Mitochondrial Proteome Does Not Promote Heart Failure. Circ Res 2020; 127:1094-1108. [PMID: 32660330 PMCID: PMC9161399 DOI: 10.1161/circresaha.120.317293] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
RATIONALE Circumstantial evidence links the development of heart failure to posttranslational modifications of mitochondrial proteins, including lysine acetylation (Kac). Nonetheless, direct evidence that Kac compromises mitochondrial performance remains sparse. OBJECTIVE This study sought to explore the premise that mitochondrial Kac contributes to heart failure by disrupting oxidative metabolism. METHODS AND RESULTS A DKO (dual knockout) mouse line with deficiencies in CrAT (carnitine acetyltransferase) and Sirt3 (sirtuin 3)-enzymes that oppose Kac by buffering the acetyl group pool and catalyzing lysine deacetylation, respectively-was developed to model extreme mitochondrial Kac in cardiac muscle, as confirmed by quantitative acetyl-proteomics. The resulting impact on mitochondrial bioenergetics was evaluated using a respiratory diagnostics platform that permits comprehensive assessment of mitochondrial function and energy transduction. Susceptibility of DKO mice to heart failure was investigated using transaortic constriction as a model of cardiac pressure overload. The mitochondrial acetyl-lysine landscape of DKO hearts was elevated well beyond that observed in response to pressure overload or Sirt3 deficiency alone. Relative changes in the abundance of specific acetylated lysine peptides measured in DKO versus Sirt3 KO hearts were strongly correlated. A proteomics comparison across multiple settings of hyperacetylation revealed ≈86% overlap between the populations of Kac peptides affected by the DKO manipulation as compared with experimental heart failure. Despite the severity of cardiac Kac in DKO mice relative to other conditions, deep phenotyping of mitochondrial function revealed a surprisingly normal bioenergetics profile. Thus, of the >120 mitochondrial energy fluxes evaluated, including substrate-specific dehydrogenase activities, respiratory responses, redox charge, mitochondrial membrane potential, and electron leak, we found minimal evidence of oxidative insufficiencies. Similarly, DKO hearts were not more vulnerable to dysfunction caused by transaortic constriction-induced pressure overload. CONCLUSIONS The findings challenge the premise that hyperacetylation per se threatens metabolic resilience in the myocardium by causing broad-ranging disruption to mitochondrial oxidative machinery.
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Affiliation(s)
- Michael T. Davidson
- Duke Molecular Physiology Institute and Sarah W. Stedman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC 27701, USA
- Department of Pharmacology and Cancer Biology
| | - Paul A. Grimsrud
- Duke Molecular Physiology Institute and Sarah W. Stedman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC 27701, USA
| | - Ling Lai
- Cardiovascular Institute and Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, PA, 19104, USA
| | - James A. Draper
- Duke Molecular Physiology Institute and Sarah W. Stedman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC 27701, USA
| | - Kelsey H. Fisher-Wellman
- Duke Molecular Physiology Institute and Sarah W. Stedman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC 27701, USA
| | - Tara M. Narowski
- Duke Molecular Physiology Institute and Sarah W. Stedman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC 27701, USA
| | - Dennis M. Abraham
- Department of Medicine, Division of Cardiology and Duke Cardiovascular Physiology Core
| | - Timothy R. Koves
- Duke Molecular Physiology Institute and Sarah W. Stedman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC 27701, USA
| | - Daniel P. Kelly
- Cardiovascular Institute and Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, PA, 19104, USA
| | - Deborah M. Muoio
- Duke Molecular Physiology Institute and Sarah W. Stedman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC 27701, USA
- Department of Pharmacology and Cancer Biology
- Department of Medicine, Division of Endocrinology, Metabolism, and Nutrition, Duke University Medical Center, Durham, NC 27710, USA
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Ramos PM, Wright SA, Delgado EF, van Santen E, Johnson DD, Scheffler JM, Elzo MA, Carr CC, Scheffler TL. Resistance to pH decline and slower calpain-1 autolysis are associated with higher energy availability early postmortem in Bos taurus indicus cattle. Meat Sci 2019; 159:107925. [PMID: 31476681 DOI: 10.1016/j.meatsci.2019.107925] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 08/23/2019] [Accepted: 08/23/2019] [Indexed: 11/16/2022]
Abstract
Beef from Bos taurus indicus is associated with toughness compared to Bos taurus taurus, suggesting there is antagonism between adaptability to heat and beef quality. Resistance to cellular stress in muscle may be protective postmortem, thereby delaying its conversion to meat. Therefore, our objective was to determine pH decline, calpain-1 and caspase 3 activation, and proteolysis in different biological cattle types. Angus, Brangus, and Brahman steers (n = 18) were harvested, and Longissimus lumborum were assessed postmortem for pH decline, ATP content, protease activation, and calpastatin content; and myofibrillar protein degradation was evaluated in beef aged to 14d. Brahman Longissimus lumborum exhibited resistance to pH decline, greater ATP content at 1 h, and delayed calpain-1 autolysis. Although content of caspase-3 zymogen was lower in Brahman, there was no evidence of caspase-3 mediated proteolysis. Greater resistance to energetic and pH changes early postmortem in Brahman Longissimus lumborum are associated with calpain-1 autolysis but not mitochondria mediated apoptosis.
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Affiliation(s)
- Patricia M Ramos
- Department of Animal Sciences, University of Florida, Gainesville, FL 32611-0910, USA; Department of Animal Sciences, "Luiz de Queiroz" College of Agriculture, University of Sao Paulo, Av. Padua Dias, 11, CEP, 13418-900 Piracicaba, Sao Paulo, Brazil
| | - Shelby A Wright
- Department of Animal Sciences, University of Florida, Gainesville, FL 32611-0910, USA
| | - Eduardo F Delgado
- Department of Animal Sciences, "Luiz de Queiroz" College of Agriculture, University of Sao Paulo, Av. Padua Dias, 11, CEP, 13418-900 Piracicaba, Sao Paulo, Brazil
| | - Edzard van Santen
- Agronomy Department, University of Florida, Gainesville, FL 32611-0500, USA
| | - D Dwain Johnson
- Department of Animal Sciences, University of Florida, Gainesville, FL 32611-0910, USA
| | - Jason M Scheffler
- Department of Animal Sciences, University of Florida, Gainesville, FL 32611-0910, USA
| | - Mauricio A Elzo
- Department of Animal Sciences, University of Florida, Gainesville, FL 32611-0910, USA
| | - C Chad Carr
- Department of Animal Sciences, University of Florida, Gainesville, FL 32611-0910, USA
| | - Tracy L Scheffler
- Department of Animal Sciences, University of Florida, Gainesville, FL 32611-0910, USA.
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Sunkaria A, Yadav A, Bhardwaj S, Sandhir R. Postnatal Proteasome Inhibition Promotes Amyloid-β Aggregation in Hippocampus and Impairs Spatial Learning in Adult Mice. Neuroscience 2017; 367:47-59. [DOI: 10.1016/j.neuroscience.2017.10.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 09/09/2017] [Accepted: 10/16/2017] [Indexed: 12/13/2022]
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Tohyama J, Nakashima M, Nabatame S, Gaik-Siew C, Miyata R, Rener-Primec Z, Kato M, Matsumoto N, Saitsu H. SPTAN1 encephalopathy: distinct phenotypes and genotypes. J Hum Genet 2015; 60:167-73. [PMID: 25631096 DOI: 10.1038/jhg.2015.5] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 12/26/2014] [Accepted: 01/06/2015] [Indexed: 12/23/2022]
Abstract
Recent progress in genetic analysis reveals that a significant proportion of cryptogenic epileptic encephalopathies are single-gene disorders. Mutations in numerous genes for early-onset epileptic encephalopathies have been rapidly identified, including in SPTAN1, which encodes α-II spectrin. The aim of this review is to delineate SPTAN1 encephalopathy as a distinct clinical syndrome. To date, a total of seven epileptic patients with four different in-frame SPTAN1 mutations have been identified. The major clinical features of SPTAN1 mutations include epileptic encephalopathy with hypsarrhythmia, no visual attention, acquired microcephaly, spastic quadriplegia and severe intellectual disability. Brainstem and cerebellar atrophy and cerebral hypomyelination, as observed by magnetic resonance imaging, are specific hallmarks of this condition. A milder variant is characterized by generalized epilepsy with pontocerebellar atrophy. Only in-frame SPTAN1 mutations in the last two spectrin repeats in the C-terminal region lead to dominant negative effects and these specific phenotypes. The last two spectrin repeats are required for α/β spectrin heterodimer associations and the mutations can alter heterodimer formation between the two spectrins. From these data we suggest that SPTAN1 encephalopathy is a distinct clinical syndrome owing to specific SPTAN1 mutations. It is important that this syndrome is recognized by pediatric neurologists to enable proper diagnostic work-up for patients.
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Affiliation(s)
- Jun Tohyama
- 1] Department of Child Neurology, Nishi-Niigata Chuo National Hospital, Niigata, Japan [2] Niigata University Medical and Dental Hospital, Niigata, Japan
| | - Mitsuko Nakashima
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Shin Nabatame
- Department of Pediatrics, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Ch'ng Gaik-Siew
- Department of Genetics, Kuala Lumpur Hospital, Kuala Lumpur, Malaysia
| | - Rie Miyata
- Department of Pediatrics, Tokyo Kita-Social Insurance Hospital, Tokyo, Japan
| | - Zvonka Rener-Primec
- Department of Pediatric Neurology, University Children's Hospital, Ljubljana, Slovenia
| | - Mitsuhiro Kato
- Department of Pediatrics, Yamagata University Faculty of Medicine, Yamagata, Japan
| | - Naomichi Matsumoto
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Hirotomo Saitsu
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
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Xie W, Song YJ, Li D, Pan LP, Wu QJ, Tian X. The suppression of epileptiform discharges in cultured hippocampal neurons is regulated via alterations in full-length tropomyosin-related kinase type B receptors signalling activity. Eur J Neurosci 2014; 40:2564-75. [PMID: 24830751 DOI: 10.1111/ejn.12620] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2014] [Revised: 04/01/2014] [Accepted: 04/11/2014] [Indexed: 11/28/2022]
Affiliation(s)
- Wei Xie
- School of Biomedical Engineering; Tianjin Medical University; Tianjin China
| | - Yi-Jun Song
- Department of Neurology; Tianjin Medical University General Hospital & Key Laboratory of Neurotrauma; Variation and Regeneration; Ministry of Education and Tianjin Municipal Government; Tianjin China
| | - Dai Li
- Senior Officials Inpatient Ward; Tianjin Medical University General Hospital and Tianjin Neurological Institute; Tianjin China
| | - Li-Ping Pan
- Department of Neurology; Tianjin Medical University General Hospital & Key Laboratory of Neurotrauma; Variation and Regeneration; Ministry of Education and Tianjin Municipal Government; Tianjin China
| | - Qiu-Jing Wu
- Department of Neurology; Tianjin Medical University General Hospital & Key Laboratory of Neurotrauma; Variation and Regeneration; Ministry of Education and Tianjin Municipal Government; Tianjin China
| | - Xin Tian
- School of Biomedical Engineering; Tianjin Medical University; Tianjin China
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Witek MA, Fung LWM. Quantitative studies of caspase-3 catalyzed αII-spectrin breakdown. Brain Res 2013; 1533:1-15. [PMID: 23948103 PMCID: PMC3786445 DOI: 10.1016/j.brainres.2013.08.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Revised: 07/27/2013] [Accepted: 08/02/2013] [Indexed: 11/29/2022]
Abstract
Under various physiological and patho-physiological conditions, spectrin breakdown reactions generate several spectrin breakdown products (SBDPs)-in particular SBDPs of 150 kDa (SBDP150) and 120 kDa (SBDP120). Recently, numerous studies have shown that reactions leading to SBDPs are physiologically relevant, well regulated, and complex. Yet molecular studies on the mechanism of the SBDP formation are comparatively scarce. We have designed basic systems to allow us to follow the breakdown of αII-spectrin model proteins by caspase-3 in detail with gel electrophoresis, fluorescence and mass spectrometry methods. Amongst the predicted and reported sites, our results show that caspase-3 cleaves after residues D1185 and D1478, but not after residues D888, D1340 and D1475. We also found that the cleavage at these two sites is independent of each other. It may be possible to inhibit one site without affecting the other site. Cleavage after residue D1185 in intact αII-spectrin leads to SBDP150, and cleavage after D1478 site leads to SBDP120. Our results also show that the cleavage after the D1185 residue is unusually efficient, with a kcat/KM value of 40,000 M(-1) s(-1), and the cleavage after the D1478 site is more similar to most of the other reported caspase-3 substrates, with a kcat/KM value of 3000 M(-1) s(-1). We believe that this study lays out a methodology and foundation to study caspase-3 catalyzed spectrin breakdown to provide quantitative information. Molecular understanding may lead to better understanding of brain injuries and more precise and specific biomarker development.
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Affiliation(s)
- Marta A. Witek
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor Street, MC 111, Chicago, IL 60607
| | - L. W.-M. Fung
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor Street, MC 111, Chicago, IL 60607
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Toporkiewicz M, Grzybek M, Meissner J, Michalczyk I, Dubielecka PM, Korycka J, Seweryn E, Sikorski AF. Release of an ~55kDa fragment containing the actin-binding domain of β-spectrin by caspase-8 during FND-induced apoptosis depends on the presence of protein 4.1. Arch Biochem Biophys 2013; 535:205-13. [PMID: 23578573 DOI: 10.1016/j.abb.2013.03.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2012] [Revised: 02/24/2013] [Accepted: 03/17/2013] [Indexed: 11/16/2022]
Abstract
Analyses of the status of the membrane spectrin-based skeleton during fludarabine/mitoxantrone/dexamethasone-induced (FND-induced) apoptosis revealed proteolytic degradation of β-spectrin, with the prevalent appearance of a specific fragment with a molecular weight of ~55kDa, containing the actin-binding domain (ABD). Appearance of this fragment was dependent on induction of apoptosis. In silico proteolysis of spectrin identified caspase-8 as a candidate protease responsible for the generation of this ~55kDa ABD-containing fragment. Analyses of spectrin and procaspase-8 localization during early apoptosis indicated temporary (<30-120min) submembranous colocalization of both proteins. Proteolytic release of the N-terminal ~55kDa fragment of purified spectrin by recombinant caspase-8 does not occur in normal cells, but does occur in isolated membrane, such as red blood cell ghosts, or in vitro in the presence of apoptotic cell extracts. Surprisingly, proteolysis of purified spectrin by recombinant caspase-8 resulted in the generation of the ~55kDa fragment only in the presence of purified protein 4.1. This suggests that only the appropriate spatial arrangement of the spectrin-based membrane skeleton or the appropriate conformational state of spectrin, which are both known to be induced by 4.1, can sensitize β-spectrin to cleavage by caspase-8 at the N-terminal ABD-containing region.
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Affiliation(s)
- Monika Toporkiewicz
- Laboratory of Cytobiochemistry, Biotechnology Faculty, University of Wrocław, ul. Przybyszewskiego 63-77, 51-148 Wrocław, Poland
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Kassa R, Monterroso V, Wentzell J, Ramos A, Couchi E, Lecomte MC, Iordanov M, Kretzschmar D, Nicolas G, Tshala-Katumbay D. Proximal giant neurofilamentous axonopathy in mice genetically engineered to resist calpain and caspase cleavage of α-II spectrin. J Mol Neurosci 2012; 47:631-8. [PMID: 22212489 PMCID: PMC3360998 DOI: 10.1007/s12031-011-9699-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Accepted: 12/21/2011] [Indexed: 11/27/2022]
Abstract
We use 1,2-diacetylbenzene (1,2-DAB) to probe molecular mechanisms of proximal giant neurofilamentous axonopathy (PGNA), a pathological hallmark of amyotrophic lateral sclerosis. The spinal cord proteome of rodents displaying 1,2-DAB PGNA suggests a reduction in the abundance of α-II spectrin (Spna2), a key protein in the maintenance of axonal integrity. Protein immunoblotting indicates that this reduction is due to Spna2 degradation. We investigated the importance of such degradation in 1,2-DAB PGNA. Spna2 mutant mice lacking a calpain- and/or caspase-sensitive domain (CSD), thus hypothetically resistant to 1,2-DAB, and wild-type littermates, were treated with 1,2-DAB, 35 mg/kg/day, or saline control, for 3 weeks. 1,2-DAB induced motor weakness and PGNA, irrespective of the genotype. Spna2-calpain breakdown products were not detected in mutant mice, which displayed a normal structure of the nervous system under saline treatment. Intriguingly, treatment with 1,2-DAB reduced the abundance of the caspase-specific 120-kDa Spna2 breakdown products. Our findings indicate that degradation of Spna2 by calpain- and/or caspase is not central to the pathogenesis of 1,2-DAB axonopathy. In addition, the Spna2-CSD seems to be not required for the maintenance of the cytoskeleton integrity. Our conceptual framework offers opportunities to study the role of calpain-caspase cross talk, including that of the protease degradomics, in models of axonal degeneration.
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Affiliation(s)
- R. Kassa
- Center for Research on Occupational and Environmental Toxicology, Oregon Health & Science University (OHSU), Portland, OR, USA
| | - V. Monterroso
- Department of Comparative Medicine, Oregon Health & Science University (OHSU), Portland, OR, USA
| | - J. Wentzell
- Center for Research on Occupational and Environmental Toxicology, Oregon Health & Science University (OHSU), Portland, OR, USA
| | - A.L. Ramos
- Center for Research on Occupational and Environmental Toxicology, Oregon Health & Science University (OHSU), Portland, OR, USA
| | - E. Couchi
- UFR de Médecine site Bichat, Institut Claude Bernard, Université Paris Diderot, Paris 7, France
| | - MC Lecomte
- INSERM, U665, Paris; Institut National de la Transfusion Sanguine, Paris, F-75015; Université Denis Diderot, Paris 7, France
| | - M Iordanov
- Department of Cell and Developmental Biology, Oregon Health & Science University (OHSU), Portland, OR, USA
| | - D. Kretzschmar
- Center for Research on Occupational and Environmental Toxicology, Oregon Health & Science University (OHSU), Portland, OR, USA
| | - G. Nicolas
- Institut Cochin, Université Paris-Descartes, CNRS (UMR 8104) & INSERM, U1016, Paris, France
| | - D. Tshala-Katumbay
- Center for Research on Occupational and Environmental Toxicology, Oregon Health & Science University (OHSU), Portland, OR, USA
- Department of Neurology, Oregon Health & Science University (OHSU), Portland, OR, USA
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Gomes JR, Costa JT, Melo CV, Felizzi F, Monteiro P, Pinto MJ, Inácio AR, Wieloch T, Almeida RD, Grãos M, Duarte CB. Excitotoxicity downregulates TrkB.FL signaling and upregulates the neuroprotective truncated TrkB receptors in cultured hippocampal and striatal neurons. J Neurosci 2012; 32:4610-22. [PMID: 22457507 PMCID: PMC6622054 DOI: 10.1523/jneurosci.0374-12.2012] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2012] [Revised: 02/15/2012] [Accepted: 02/16/2012] [Indexed: 12/14/2022] Open
Abstract
Brain-derived neurotrophic factor (BDNF) plays an important role in neuronal survival through activation of TrkB receptors. The trkB gene encodes a full-length receptor tyrosine kinase (TrkB.FL) and its truncated (T1/T2) isoforms. We investigated the changes in TrkB protein levels and signaling activity under excitotoxic conditions, which are characteristic of brain ischemia, traumatic brain injury, and neurodegenerative disorders. Excitotoxic stimulation of cultured rat hippocampal or striatal neurons downregulated TrkB.FL and upregulated a truncated form of the receptor (TrkB.T). Downregulation of TrkB.FL was mediated by calpains, whereas the increase in TrkB.T protein levels required transcription and translation activities. Downregulation of TrkB.FL receptors in hippocampal neurons correlated with a decrease in BDNF-induced activation of the Ras/ERK and PLCγ pathways. However, calpain inhibition, which prevents TrkB.FL degradation, did not preclude the decrease in signaling activity of these receptors. On the other hand, incubation with anisomycin, to prevent the upregulation of TrkB.T, protected to a large extent the TrkB.FL signaling activity, suggesting that truncated receptors may act as dominant-negatives. The upregulation of TrkB.T under excitotoxic conditions was correlated with an increase in BDNF-induced inhibition of RhoA, a mediator of excitotoxic neuronal death. BDNF fully protected hippocampal neurons transduced with TrkB.T when present during excitotoxic stimulation with glutamate, in contrast with the partial protection observed in cells overexpressing TrkB.FL or expressing GFP. These results indicate that BDNF protects hippocampal neurons by two distinct mechanisms: through the neurotrophic effects of TrkB.FL receptors and by activation of TrkB.T receptors coupled to inhibition of the excitotoxic signaling.
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Affiliation(s)
- João R. Gomes
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
| | - João T. Costa
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
| | - Carlos V. Melo
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
| | - Federico Felizzi
- ETH Zurich, Department of Biosystems Science and Engineering (DBSSE), 4058 Basel, Switzerland
| | | | - Maria J. Pinto
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
| | - Ana R. Inácio
- Wallenberg Neuroscience Center, Lund University, 221 84 Lund, Sweden, and
| | - Tadeusz Wieloch
- Wallenberg Neuroscience Center, Lund University, 221 84 Lund, Sweden, and
| | - Ramiro D. Almeida
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
| | | | - Carlos B. Duarte
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
- Biocant, 3060-197 Cantanhede, Portugal
- Department of Life Sciences, University of Coimbra, 3004-517 Coimbra, Portugal
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11
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Gellert P, Teranishi M, Jenniches K, De Gaspari P, John D, Kreymborg KG, Braun T, Uchida S. Gene Array Analyzer: alternative usage of gene arrays to study alternative splicing events. Nucleic Acids Res 2011; 40:2414-25. [PMID: 22123740 PMCID: PMC3315316 DOI: 10.1093/nar/gkr1110] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Exon arrays are regularly used to analyze differential splicing events. GeneChip Gene 1.0 ST Arrays (gene arrays) manufactured by Affymetrix, Inc. are primarily used to determine expression levels of transcripts, although their basic design is rather similar to GeneChip Exon 1.0 ST Arrays (exon arrays). Here, we show that the newly developed Gene Array Analyzer (GAA), which evolved from our previously published Exon Array Analyzer (EAA), enables economic and user-friendly analysis of alternative splicing events using gene arrays. To demonstrate the applicability of GAA, we profiled alternative splicing events during embryonic heart development. In addition, we found that numerous developmental splicing events are also activated under pathological conditions. We reason that the usage of GAA considerably expands the analysis of gene expression based on gene arrays and supplies an additional level of information without further costs and with only little effort.
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Affiliation(s)
- Pascal Gellert
- Max-Planck Institute for Heart and Lung Research, Ludwigstrasse 43, 61231 Bad Nauheim, Germany
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12
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Machnicka B, Grochowalska R, Bogusławska DM, Sikorski AF, Lecomte MC. Spectrin-based skeleton as an actor in cell signaling. Cell Mol Life Sci 2011; 69:191-201. [PMID: 21877118 PMCID: PMC3249148 DOI: 10.1007/s00018-011-0804-5] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2011] [Revised: 08/08/2011] [Accepted: 08/10/2011] [Indexed: 01/12/2023]
Abstract
This review focuses on the recent advances in functions of spectrins in non-erythroid cells. We discuss new data concerning the commonly known role of the spectrin-based skeleton in control of membrane organization, stability and shape, and tethering protein mosaics to the cellular motors and to all major filament systems. Particular effort has been undertaken to highlight recent advances linking spectrin to cell signaling phenomena and its participation in signal transduction pathways in many cell types.
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Affiliation(s)
- B Machnicka
- University of Zielona Góra, Zielona Góra, Poland
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Baines AJ. The spectrin-ankyrin-4.1-adducin membrane skeleton: adapting eukaryotic cells to the demands of animal life. PROTOPLASMA 2010; 244:99-131. [PMID: 20668894 DOI: 10.1007/s00709-010-0181-1] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2010] [Accepted: 07/05/2010] [Indexed: 05/29/2023]
Abstract
The cells in animals face unique demands beyond those encountered by their unicellular eukaryotic ancestors. For example, the forces engendered by the movement of animals places stresses on membranes of a different nature than those confronting free-living cells. The integration of cells into tissues, as well as the integration of tissue function into whole animal physiology, requires specialisation of membrane domains and the formation of signalling complexes. With the evolution of mammals, the specialisation of cell types has been taken to an extreme with the advent of the non-nucleated mammalian red blood cell. These and other adaptations to animal life seem to require four proteins--spectrin, ankyrin, 4.1 and adducin--which emerged during eumetazoan evolution. Spectrin, an actin cross-linking protein, was probably the earliest of these, with ankyrin, adducin and 4.1 only appearing as tissues evolved. The interaction of spectrin with ankyrin is probably a prerequisite for the formation of tissues; only with the advent of vertebrates did 4.1 acquires the ability to bind spectrin and actin. The latter activity seems to allow the spectrin complex to regulate the cell surface accumulation of a wide variety of proteins. Functionally, the spectrin-ankyrin-4.1-adducin complex is implicated in the formation of apical and basolateral domains, in aspects of membrane trafficking, in assembly of certain signalling and cell adhesion complexes and in providing stability to otherwise mechanically fragile cell membranes. Defects in this complex are manifest in a variety of hereditary diseases, including deafness, cardiac arrhythmia, spinocerebellar ataxia, as well as hereditary haemolytic anaemias. Some of these proteins also function as tumor suppressors. The spectrin-ankyrin-4.1-adducin complex represents a remarkable system that underpins animal life; it has been adapted to many different functions at different times during animal evolution.
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Affiliation(s)
- Anthony J Baines
- School of Biosciences and Centre for Biomedical Informatics, University of Kent, Canterbury, CT2 7NJ, UK.
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Brieger A, Adryan B, Wolpert F, Passmann S, Zeuzem S, Trojan J. Cytoskeletal scaffolding proteins interact with Lynch-Syndrome associated mismatch repair protein MLH1. Proteomics 2010; 10:3343-55. [DOI: 10.1002/pmic.200900672] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Saitsu H, Tohyama J, Kumada T, Egawa K, Hamada K, Okada I, Mizuguchi T, Osaka H, Miyata R, Furukawa T, Haginoya K, Hoshino H, Goto T, Hachiya Y, Yamagata T, Saitoh S, Nagai T, Nishiyama K, Nishimura A, Miyake N, Komada M, Hayashi K, Hirai SI, Ogata K, Kato M, Fukuda A, Matsumoto N. Dominant-negative mutations in alpha-II spectrin cause West syndrome with severe cerebral hypomyelination, spastic quadriplegia, and developmental delay. Am J Hum Genet 2010; 86:881-91. [PMID: 20493457 DOI: 10.1016/j.ajhg.2010.04.013] [Citation(s) in RCA: 119] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2010] [Revised: 04/29/2010] [Accepted: 04/30/2010] [Indexed: 11/24/2022] Open
Abstract
A de novo 9q33.3-q34.11 microdeletion involving STXBP1 has been found in one of four individuals (group A) with early-onset West syndrome, severe hypomyelination, poor visual attention, and developmental delay. Although haploinsufficiency of STXBP1 was involved in early infantile epileptic encephalopathy in a previous different cohort study (group B), no mutations of STXBP1 were found in two of the remaining three subjects of group A (one was unavailable). We assumed that another gene within the deletion might contribute to the phenotype of group A. SPTAN1 encoding alpha-II spectrin, which is essential for proper myelination in zebrafish, turned out to be deleted. In two subjects, an in-frame 3 bp deletion and a 6 bp duplication in SPTAN1 were found at the initial nucleation site of the alpha/beta spectrin heterodimer. SPTAN1 was further screened in six unrelated individuals with WS and hypomyelination, but no mutations were found. Recombinant mutant (mut) and wild-type (WT) alpha-II spectrin could assemble heterodimers with beta-II spectrin, but alpha-II (mut)/beta-II spectrin heterodimers were thermolabile compared with the alpha-II (WT)/beta-II heterodimers. Transient expression in mouse cortical neurons revealed aggregation of alpha-II (mut)/beta-II and alpha-II (mut)/beta-III spectrin heterodimers, which was also observed in lymphoblastoid cells from two subjects with in-frame mutations. Clustering of ankyrinG and voltage-gated sodium channels at axon initial segment (AIS) was disturbed in relation to the aggregates, together with an elevated action potential threshold. These findings suggest that pathological aggregation of alpha/beta spectrin heterodimers and abnormal AIS integrity resulting from SPTAN1 mutations were involved in pathogenesis of infantile epilepsy.
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Inhibition of calpain but not caspase activity by spectrin fragments. Cell Mol Biol Lett 2010; 15:395-405. [PMID: 20467904 PMCID: PMC3074365 DOI: 10.2478/s11658-010-0015-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2010] [Accepted: 04/25/2010] [Indexed: 11/29/2022] Open
Abstract
Calpains and caspases are ubiquitous cysteine proteases that are associated with a variety of cellular pathways. Calpains are involved in processes such as long term potentiation, cell motility and apoptosis, and have been shown to cleave non-erythroid (brain) α- and β-spectrin and erythroid β-spectrin. The cleavage of erythroid α-spectrin by calpain has not been reported. Caspases play an important role in the initiation and execution of apoptosis, and have been shown to cleave non-erythroid but not erythroid spectrin. We have studied the effect of spectrin fragments on calpain and caspase activities. The erythroid and non-erythroid spectrin fragments used were from the N-terminal region of α-spectrin, and C-terminal region of β-spectrin, both consisting of regions involved in spectrin tetramer formation. We observed that the all spectrin fragments exhibited a concentration-dependent inhibitory effect on calpain, but not caspase activity. It is clear that additional studies are warranted to determine the physiological significance of calpain inhibition by spectrin fragments. Our findings suggest that calpain activity is modulated by the presence of spectrin partial domains at the tetramerization site. It is not clear whether the inhibitory effect is substrate specific or is a general effect. Further studies of this inhibitory effect may lead to the identification and development of new therapeutic agents specifically for calpains, but not for caspases. Proteins/peptides with a coiled coil helical conformation should be studied for potential inhibitory effects on calpain activity.
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Amyloid-beta42 signals tau hyperphosphorylation and compromises neuronal viability by disrupting alkylacylglycerophosphocholine metabolism. Proc Natl Acad Sci U S A 2009; 106:20936-41. [PMID: 19926863 DOI: 10.1073/pnas.0905654106] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Perturbation of lipid second messenger networks is associated with the impairment of synaptic function in Alzheimer disease. Underlying molecular mechanisms are unclear. Here, we used an unbiased lipidomic approach to profile alkylacylglycerophosphocholine second messengers in diseased tissue. We found that specific isoforms defined by a palmitic acid (16:0) at the sn-1 position, namely 1-O-hexadecyl-2-acetyl-sn-glycero-3-phosphocholine (C16:0 PAF) and 1-O-hexadecyl-sn-glycero-3-phosphocholine (C16:0 lyso-PAF), were elevated in the temporal cortex of Alzheimer disease patients, transgenic mice expressing human familial disease-mutant amyloid precursor protein, and human neurons directly exposed to amyloid-beta(42) oligomers. Acute intraneuronal accumulation of C16:0 PAF but not C16:0 lyso-PAF initiated cyclin-dependent kinase 5-mediated hyperphosphorylation of tau on Alzheimer disease-specific epitopes. Chronic elevation caused a caspase 2 and 3/7-dependent cascade resulting in neuronal death. Pharmacological inhibition of C16:0 PAF signaling, or molecular strategies increasing hydrolysis of C16:0 PAF to C16:0 lyso-PAF, protected human neurons from amyloid-beta(42) toxicity. Together, these data provide mechanistic insight into how disruptions in lipid metabolism can determine neuronal response to accumulating oligomeric amyloid-beta(42).
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Multiple alphaII-spectrin breakdown products distinguish calpain and caspase dominated necrotic and apoptotic cell death pathways. Apoptosis 2009; 14:1289-98. [DOI: 10.1007/s10495-009-0405-z] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Cheillan D, Malleval C, Ausseil J, Vitry S, Heard JM, Maire I, Honnorat J, Belin MF, Touret M. Abnormal expression of truncated CRMP-1 protein in the brain cortex of MPSIIIB mice. Mol Genet Metab 2008; 94:135-8. [PMID: 18325808 DOI: 10.1016/j.ymgme.2008.01.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2008] [Accepted: 01/22/2008] [Indexed: 11/28/2022]
Abstract
Mucopolysaccharidosis IIIB is a lysosomal disease characterized by a severe neurological deterioration, the pathophysiological mechanisms of which are poorly understood. Recently FGF pathway was shown to be altered leading us to explore a downstream target involved in brain development: the collapsin response mediator protein-1 (CRMP-1). CRMP-1 transcript level was normal but a cleavage of CRMP-1 was observed with an abnormal expression of the truncated form until adult age. This truncated CRMP-1 protein could play a role in post-natal cortex maturation and be involved in neuronal alterations occurring in lysosomal diseases.
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Affiliation(s)
- David Cheillan
- INSERM, U842, Université de Lyon, Lyon1, UMR-S842, Faculté de Médecine Laennec, Lyon F-69372, France.
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