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Jara-Guajardo P, Morales-Zavala F, Bolaños K, Giralt E, Araya E, Acosta GA, Albericio F, Alvarez AR, Kogan MJ. Differential Detection of Amyloid Aggregates in Old Animals Using Gold Nanorods by Computerized Tomography: A Pharmacokinetic and Bioaccumulation Study. Int J Nanomedicine 2023; 18:8169-8185. [PMID: 38169997 PMCID: PMC10759924 DOI: 10.2147/ijn.s435472] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Accepted: 12/18/2023] [Indexed: 01/05/2024] Open
Abstract
Introduction The development of new materials and tools for radiology is key to the implementation of this diagnostic technique in clinics. In this work, we evaluated the differential accumulation of peptide-functionalized GNRs in a transgenic animal model (APPswe/PSENd1E9) of Alzheimer's disease (AD) by computed tomography (CT) and measured the pharmacokinetic parameters and bioaccumulation of the nanosystem. Methods The GNRs were functionalized with two peptides, Ang2 and D1, which conferred on them the properties of crossing the blood-brain barrier and binding to amyloid aggregates, respectively, thus making them a diagnostic tool with great potential for AD. The nanosystem was administered intravenously in APPswe/PSEN1dE9 model mice of 4-, 8- and 18-months of age, and the accumulation of gold nanoparticles was observed by computed tomography (CT). The gold accumulation and biodistribution were determined by atomic absorption. Results Our findings indicated that 18-month-old animals treated with our nanosystem (GNR-D1/Ang2) displayed noticeable differences in CT signals compared to those treated with a control nanosystem (GNR-Ang2). However, no such distinctions were observed in younger animals. This suggests that our nanosystem holds the potential to effectively detect AD pathology. Discussion These results support the future development of gold nanoparticle-based technology as a more effective and accessible alternative for the diagnosis of AD and represent a significant advance in the development of gold nanoparticle applications in disease diagnosis.
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Affiliation(s)
- Pedro Jara-Guajardo
- Departamento de Quimica Farmacologica y Toxicologica, Facultad de Ciencias Quimicas y Farmaceuticas, Universidad de Chile, Santiago, Chile
- Advanced Center for Chronic Diseases (ACCDiS), Independencia, Santiago, Chile
| | - Francisco Morales-Zavala
- Departamento de Quimica Farmacologica y Toxicologica, Facultad de Ciencias Quimicas y Farmaceuticas, Universidad de Chile, Santiago, Chile
- Advanced Center for Chronic Diseases (ACCDiS), Independencia, Santiago, Chile
| | - Karen Bolaños
- Departamento de Quimica Farmacologica y Toxicologica, Facultad de Ciencias Quimicas y Farmaceuticas, Universidad de Chile, Santiago, Chile
- Advanced Center for Chronic Diseases (ACCDiS), Independencia, Santiago, Chile
- Center for Studies on Exercise, Metabolism and Cancer (CEMC), Laboratory of Cellular Communication, Program of Cell and Molecular Biology, Faculty of Medicine, Institute of Biomedical Sciences (ICBM), University of Chile, Santiago, Chile
| | - Ernest Giralt
- Institute for Research in Biomedicine (IRB Barcelona), Barcelona Institute of Science and Technology (BIST), Barcelona, Spain
- Department of Inorganic and Organic Chemistry, University of Barcelona, Barcelona, Spain
| | - Eyleen Araya
- Advanced Center for Chronic Diseases (ACCDiS), Independencia, Santiago, Chile
- Departamento de Ciencias Quimicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Santiago, Chile
| | - Gerardo A Acosta
- CIBER-BBN, Networking Centre on Bioengineering, Biomaterials and Nanomedicine & Department of Organic Chemistry, University of Barcelona, Barcelona, Spain
- Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), Barcelona, 08034, Spain
| | - Fernando Albericio
- Department of Inorganic and Organic Chemistry, University of Barcelona, Barcelona, Spain
- CIBER-BBN, Networking Centre on Bioengineering, Biomaterials and Nanomedicine & Department of Organic Chemistry, University of Barcelona, Barcelona, Spain
- School of Chemistry & Physics, University of KwaZulu-Natal, Durban, South Africa
| | - Alejandra R Alvarez
- Cell Signaling Laboratory, Department of Cellular and Molecular Biology, Biological Sciences Faculty, Millennium Institute on Immunology and Immunotherapy, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Marcelo J Kogan
- Departamento de Quimica Farmacologica y Toxicologica, Facultad de Ciencias Quimicas y Farmaceuticas, Universidad de Chile, Santiago, Chile
- Advanced Center for Chronic Diseases (ACCDiS), Independencia, Santiago, Chile
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Martinez A, Lamaizon CM, Valls C, Llambi F, Leal N, Fitzgerald P, Guy C, Kamiński MM, Inestrosa NC, van Zundert B, Cancino GI, Dulcey AE, Zanlungo S, Marugan JJ, Hetz C, Green DR, Alvarez AR. c-Abl Phosphorylates MFN2 to Regulate Mitochondrial Morphology in Cells under Endoplasmic Reticulum and Oxidative Stress, Impacting Cell Survival and Neurodegeneration. Antioxidants (Basel) 2023; 12:2007. [PMID: 38001860 PMCID: PMC10669615 DOI: 10.3390/antiox12112007] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 10/17/2023] [Accepted: 11/13/2023] [Indexed: 11/26/2023] Open
Abstract
The endoplasmic reticulum is a subcellular organelle key in the control of synthesis, folding, and sorting of proteins. Under endoplasmic reticulum stress, an adaptative unfolded protein response is activated; however, if this activation is prolonged, cells can undergo cell death, in part due to oxidative stress and mitochondrial fragmentation. Here, we report that endoplasmic reticulum stress activates c-Abl tyrosine kinase, inducing its translocation to mitochondria. We found that endoplasmic reticulum stress-activated c-Abl interacts with and phosphorylates the mitochondrial fusion protein MFN2, resulting in mitochondrial fragmentation and apoptosis. Moreover, the pharmacological or genetic inhibition of c-Abl prevents MFN2 phosphorylation, mitochondrial fragmentation, and apoptosis in cells under endoplasmic reticulum stress. Finally, in the amyotrophic lateral sclerosis mouse model, where endoplasmic reticulum and oxidative stress has been linked to neuronal cell death, we demonstrated that the administration of c-Abl inhibitor neurotinib delays the onset of symptoms. Our results uncovered a function of c-Abl in the crosstalk between endoplasmic reticulum stress and mitochondrial dynamics via MFN2 phosphorylation.
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Affiliation(s)
- Alexis Martinez
- Cell Signaling Laboratory, Department of Cell and Molecular Biology, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile
- Basal Center for Aging and Regeneration, Pontificia Universidad Católica de Chile (CARE UC), Santiago 8331150, Chile
| | - Cristian M. Lamaizon
- Cell Signaling Laboratory, Department of Cell and Molecular Biology, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile
- Millennium Institute on Immunology and Immunotherapy, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile
| | - Cristian Valls
- Cell Signaling Laboratory, Department of Cell and Molecular Biology, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile
| | - Fabien Llambi
- Department of Immunology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Nancy Leal
- Cell Signaling Laboratory, Department of Cell and Molecular Biology, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile
| | - Patrick Fitzgerald
- Department of Immunology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Cliff Guy
- Department of Immunology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Marcin M. Kamiński
- Department of Immunology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Nibaldo C. Inestrosa
- Basal Center for Aging and Regeneration, Pontificia Universidad Católica de Chile (CARE UC), Santiago 8331150, Chile
- Center of Excellence in Biomedicine of Magallanes (CEBIMA), University of Magallanes, Punta Arenas 6210427, Chile
| | - Brigitte van Zundert
- Basal Center for Aging and Regeneration, Pontificia Universidad Católica de Chile (CARE UC), Santiago 8331150, Chile
- Institute of Biomedical Sciences, Faculty of Medicine & Faculty of Life Sciences, Universidad Andres Bello, Santiago 8370146, Chile
- Department of Neurology, University of Massachusetts Chan Medical School (UMMS), Worcester, MA 01655, USA
| | - Gonzalo I. Cancino
- Laboratory of Neurobiology, Department of Cell and Molecular Biology, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile
| | - Andrés E. Dulcey
- Early Translation Branch, National Center for Advancing Translational Sciences (NCATS), NIH, 9800 Medical Center Drive, Rockville, MD 20850, USA
| | - Silvana Zanlungo
- Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Av. Libertador Bernardo O’Higgins 340, Santiago 8331150, Chile
| | - Juan J. Marugan
- Early Translation Branch, National Center for Advancing Translational Sciences (NCATS), NIH, 9800 Medical Center Drive, Rockville, MD 20850, USA
| | - Claudio Hetz
- Biomedical Neuroscience Institute (BNI), Faculty of Medicine, University of Chile, Santiago 8330015, Chile
- Center for Geroscience, Brain Health and Metabolism (GERO), Santiago 8380453, Chile
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago 8330015, Chile
- The Buck Institute for Research in Aging, Novato, CA 94945, USA
| | - Douglas R. Green
- Department of Immunology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Alejandra R. Alvarez
- Cell Signaling Laboratory, Department of Cell and Molecular Biology, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile
- Basal Center for Aging and Regeneration, Pontificia Universidad Católica de Chile (CARE UC), Santiago 8331150, Chile
- Millennium Institute on Immunology and Immunotherapy, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile
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Marín T, Valls C, Jerez C, Huerta T, Elgueta D, Vidal RL, Alvarez AR, Cancino GI. The c-Abl/p73 pathway induces neurodegeneration in a Parkinson's disease model. IBRO Neurosci Rep 2022; 13:378-387. [PMID: 36590096 PMCID: PMC9795287 DOI: 10.1016/j.ibneur.2022.10.006] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 10/12/2022] [Accepted: 10/17/2022] [Indexed: 11/08/2022] Open
Abstract
Parkinson's disease is the second most common neurodegenerative disorder. Although it is clear that dopaminergic neurons degenerate, the underlying molecular mechanisms are still unknown, and thus, successful treatment is still elusive. One pro-apoptotic pathway associated with several neurodegenerative diseases is the tyrosine kinase c-Abl and its target p73. Here, we evaluated the contribution of c-Abl and p73 in the degeneration of dopaminergic neurons induced by the neurotoxin 6-hydroxydopamine as a model for Parkinson's disease. First, we found that in SH-SY5Y cells treated with 6-hydroxydopamine, c-Abl and p73 phosphorylation levels were up-regulated. Also, we found that the pro-apoptotic p73 isoform TAp73 was up-regulated. Then, to evaluate whether c-Abl tyrosine kinase activity is necessary for 6-hydroxydopamine-induced apoptosis, we co-treated SH-SY5Y cells with 6-hydroxydopamine and Imatinib, a c-Abl specific inhibitor, observing that Imatinib prevented p73 phosphorylation, TAp73 up-regulation, and protected SH-SY5Y cells treated with 6-hydroxydopamine from apoptosis. Interestingly, this observation was confirmed in the c-Abl conditional null mice, where 6-hydroxydopamine stereotaxic injections induced a lesser reduction of dopaminergic neurons than in the wild-type mice significantly. Finally, we found that the intraperitoneal administration of Imatinib prevented the death of dopaminergic neurons induced by injecting 6-hydroxydopamine stereotaxically in the mice striatum. Thus, our findings support the idea that the c-Abl/p73 pathway is involved in 6-hydroxydopamine degeneration and suggest that inhibition of its kinase activity might be used as a therapeutical drug in Parkinson's disease.
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Affiliation(s)
- Tamara Marín
- Cell Signaling Laboratory, Department of Cellular and Molecular Biology, Millennium Institute on Immunology and Immunotherapy, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago 8331010, Chile
| | - Cristian Valls
- Cell Signaling Laboratory, Department of Cellular and Molecular Biology, Millennium Institute on Immunology and Immunotherapy, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago 8331010, Chile
| | - Carolina Jerez
- Center for Integrative Biology, Facultad de Ciencias, Universidad Mayor, Santiago 8580745, Chile
| | - Tomás Huerta
- Center for Integrative Biology, Facultad de Ciencias, Universidad Mayor, Santiago 8580745, Chile
| | - Daniela Elgueta
- Center for Integrative Biology, Facultad de Ciencias, Universidad Mayor, Santiago 8580745, Chile
| | - René L. Vidal
- Center for Integrative Biology, Facultad de Ciencias, Universidad Mayor, Santiago 8580745, Chile
- Center for Geroscience, Brain Health and Metabolism, Santiago 8580745, Chile
| | - Alejandra R. Alvarez
- Cell Signaling Laboratory, Department of Cellular and Molecular Biology, Millennium Institute on Immunology and Immunotherapy, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago 8331010, Chile
- Corresponding author.
| | - Gonzalo I. Cancino
- Center for Integrative Biology, Facultad de Ciencias, Universidad Mayor, Santiago 8580745, Chile
- Department of Cellular and Molecular Biology, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago 8331010, Chile
- Corresponding author at: Center for Integrative Biology, Facultad de Ciencias, Universidad Mayor, Santiago 8580745, Chile.
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Marín T, Dulcey AE, Campos F, de la Fuente C, Acuña M, Castro J, Pinto C, Yañez MJ, Cortez C, McGrath DW, Sáez PJ, Gorshkov K, Zheng W, Southall N, Carmo-Fonseca M, Marugán J, Alvarez AR, Zanlungo S. c-Abl Activation Linked to Autophagy-Lysosomal Dysfunction Contributes to Neurological Impairment in Niemann-Pick Type A Disease. Front Cell Dev Biol 2022; 10:844297. [PMID: 35399514 PMCID: PMC8985125 DOI: 10.3389/fcell.2022.844297] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 02/25/2022] [Indexed: 12/05/2022] Open
Abstract
Niemann-Pick type A (NPA) disease is a fatal lysosomal neurodegenerative disorder caused by the deficiency in acid sphingomyelinase (ASM) activity. NPA patients present severe and progressive neurodegeneration starting at an early age. Currently, there is no effective treatment for this disease and NPA patients die between 2 and 3 years of age. NPA is characterized by an accumulation of sphingomyelin in lysosomes and dysfunction in the autophagy-lysosomal pathway. Recent studies show that c-Abl tyrosine kinase activity downregulates autophagy and the lysosomal pathway. Interestingly, this kinase is also activated in other lysosomal neurodegenerative disorders. Here, we describe that c-Abl activation contributes to the mechanisms of neuronal damage and death in NPA disease. Our data demonstrate that: 1) c-Abl is activated in-vitro as well as in-vivo NPA models; 2) imatinib, a clinical c-Abl inhibitor, reduces autophagy-lysosomal pathway alterations, restores autophagy flux, and lowers sphingomyelin accumulation in NPA patient fibroblasts and NPA neuronal models and 3) chronic treatment with nilotinib and neurotinib, two c-Abl inhibitors with differences in blood-brain barrier penetrance and target binding mode, show further benefits. While nilotinib treatment reduces neuronal death in the cerebellum and improves locomotor functions, neurotinib decreases glial activation, neuronal disorganization, and loss in hippocampus and cortex, as well as the cognitive decline of NPA mice. Our results support the participation of c-Abl signaling in NPA neurodegeneration and autophagy-lysosomal alterations, supporting the potential use of c-Abl inhibitors for the clinical treatment of NPA patients.
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Affiliation(s)
- Tamara Marín
- Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Andrés E. Dulcey
- Early Translation Branch, National Center for Advancing Translational Sciences (NCATS), NIH, Rockville, MD, United States
| | - Fabián Campos
- Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Catalina de la Fuente
- Laboratory of Cell Signaling, Center for Aging and Regeneration (CARE), Millennium Institute on Immunology and Immunotherapy (IMII), Department of Cellular and Molecular Biology, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Mariana Acuña
- Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, United States
| | - Juan Castro
- Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Claudio Pinto
- Laboratory of Cell Signaling, Center for Aging and Regeneration (CARE), Millennium Institute on Immunology and Immunotherapy (IMII), Department of Cellular and Molecular Biology, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - María José Yañez
- School of Medical Technology, Health Sciences Faculty, Universidad San Sebastián, Santiago, Chile
| | - Cristian Cortez
- Center for Genomics and Bioinformatics, Faculty of Science, Universidad Mayor, Santiago, Chile
| | - David W. McGrath
- Cell Communication and Migration Laboratory, Institute of Biochemistry and Molecular Cell Biology, Center for Experimental Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Pablo J. Sáez
- Cell Communication and Migration Laboratory, Institute of Biochemistry and Molecular Cell Biology, Center for Experimental Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Kirill Gorshkov
- Early Translation Branch, National Center for Advancing Translational Sciences (NCATS), NIH, Rockville, MD, United States
| | - Wei Zheng
- Early Translation Branch, National Center for Advancing Translational Sciences (NCATS), NIH, Rockville, MD, United States
| | - Noel Southall
- Early Translation Branch, National Center for Advancing Translational Sciences (NCATS), NIH, Rockville, MD, United States
| | - Maria Carmo-Fonseca
- Instituto de Medicina Molecular Joȧo Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | - Juan Marugán
- Early Translation Branch, National Center for Advancing Translational Sciences (NCATS), NIH, Rockville, MD, United States
- *Correspondence: Juan Marugán, ; Alejandra R. Alvarez, ; Silvana Zanlungo,
| | - Alejandra R. Alvarez
- Laboratory of Cell Signaling, Center for Aging and Regeneration (CARE), Millennium Institute on Immunology and Immunotherapy (IMII), Department of Cellular and Molecular Biology, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Santiago, Chile
- *Correspondence: Juan Marugán, ; Alejandra R. Alvarez, ; Silvana Zanlungo,
| | - Silvana Zanlungo
- Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
- *Correspondence: Juan Marugán, ; Alejandra R. Alvarez, ; Silvana Zanlungo,
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Balboa E, Marín T, Oyarzún JE, Contreras PS, Hardt R, van den Bosch T, Alvarez AR, Rebolledo-Jaramillo B, Klein AD, Winter D, Zanlungo S. Proteomic Analysis of Niemann-Pick Type C Hepatocytes Reveals Potential Therapeutic Targets for Liver Damage. Cells 2021; 10:cells10082159. [PMID: 34440927 PMCID: PMC8392304 DOI: 10.3390/cells10082159] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 08/16/2021] [Accepted: 08/18/2021] [Indexed: 12/21/2022] Open
Abstract
Niemann-Pick type C disease (NPCD) is a lysosomal storage disorder caused by mutations in the NPC1 gene. The most affected tissues are the central nervous system and liver, and while significant efforts have been made to understand its neurological component, the pathophysiology of the liver damage remains unclear. In this study, hepatocytes derived from wild type and Npc1-/- mice were analyzed by mass spectrometry (MS)-based proteomics in conjunction with bioinformatic analysis. We identified 3832 proteins: 416 proteins had a p-value smaller than 0.05, of which 37% (n = 155) were considered differentially expressed proteins (DEPs), 149 of them were considered upregulated, and 6 were considered downregulated. We focused the analysis on pathways related to NPC pathogenic mechanisms, finding that the most significant changes in expression levels occur in proteins that function in the pathways of liver damage, lipid metabolism, and inflammation. Moreover, in the group of DEPs, 30% (n = 47) were identified as lysosomal proteins and 7% (n = 10) were identified as mitochondrial proteins. Importantly, we found that lysosomal DEPs, including CTSB/D/Z, LIPA, DPP7 and GLMP, and mitocondrial DEPs, AKR1B10, and VAT1 had been connected with liver fibrosis, damage, and steatosis in previous studies, validiting our dataset. Our study found potential therapeutic targets for the treatment of liver damage in NPCD.
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Affiliation(s)
- Elisa Balboa
- Departamento de Gastroenterología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago 8330024, Chile
| | - Tamara Marín
- Departamento de Gastroenterología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago 8330024, Chile
| | - Juan Esteban Oyarzún
- Departamento de Gastroenterología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago 8330024, Chile
| | - Pablo S Contreras
- Cell and Developmental Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892-8018, USA
| | - Robert Hardt
- Institute for Biochemistry and Molecular Biology, Medical Faculty, University of Bonn, 53115 Bonn, Germany
| | - Thea van den Bosch
- Institute for Biochemistry and Molecular Biology, Medical Faculty, University of Bonn, 53115 Bonn, Germany
| | - Alejandra R Alvarez
- Laboratory of Cell Signaling, Department of Cellular and Molecular Biology, Biological Sciences Faculty, CARE UC, Pontificia Universidad Católica de Chile, Santiago 8330024, Chile
| | - Boris Rebolledo-Jaramillo
- Centro de Genética y Genómica, Facultad de Medicina, Clínica Alemana Universidad del Desarrollo, Santiago 7710162, Chile
| | - Andres D Klein
- Centro de Genética y Genómica, Facultad de Medicina, Clínica Alemana Universidad del Desarrollo, Santiago 7710162, Chile
| | - Dominic Winter
- Institute for Biochemistry and Molecular Biology, Medical Faculty, University of Bonn, 53115 Bonn, Germany
| | - Silvana Zanlungo
- Departamento de Gastroenterología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago 8330024, Chile
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Montecino F, González N, Blanco N, Ramírez MJ, González-Martín A, Alvarez AR, Olguín H. c-Abl Kinase Is Required for Satellite Cell Function Through Pax7 Regulation. Front Cell Dev Biol 2021; 9:606403. [PMID: 33777928 PMCID: PMC7990767 DOI: 10.3389/fcell.2021.606403] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 02/08/2021] [Indexed: 01/06/2023] Open
Abstract
Satellite cells (SCs) are tissue-specific stem cells responsible for adult skeletal muscle regeneration and maintenance. SCs function is critically dependent on two families of transcription factors: the paired box (Pax) involved in specification and maintenance and the Muscle Regulatory Factors (MRFs), which orchestrate myogenic commitment and differentiation. In turn, signaling events triggered by extrinsic and intrinsic stimuli control their function via post-translational modifications, including ubiquitination and phosphorylation. In this context, the Abelson non-receptor tyrosine kinase (c-Abl) mediates the activation of the p38 α/β MAPK pathway, promoting myogenesis. c-Abl also regulates the activity of the transcription factor MyoD during DNA-damage stress response, pausing differentiation. However, it is not clear if c-Abl modulates other key transcription factors controlling SC function. This work aims to determine the role of c-Abl in SCs myogenic capacity via loss of function approaches in vitro and in vivo. Here we show that c-Abl inhibition or deletion results in a down-regulation of Pax7 mRNA and protein levels, accompanied by decreased Pax7 transcriptional activity, without a significant effect on MRF expression. Additionally, we provide data indicating that Pax7 is directly phosphorylated by c-Abl. Finally, SC-specific c-Abl ablation impairs muscle regeneration upon acute injury. Our results indicate that c-Abl regulates myogenic progression in activated SCs by controlling Pax7 function and expression.
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Affiliation(s)
- Fabián Montecino
- Laboratory of Tissue Repair and Adult Stem Cells, Department of Molecular and Cell Biology, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Natalia González
- Laboratory of Tissue Repair and Adult Stem Cells, Department of Molecular and Cell Biology, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Natasha Blanco
- Laboratory of Tissue Repair and Adult Stem Cells, Department of Molecular and Cell Biology, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Manuel J Ramírez
- Laboratory of Tissue Repair and Adult Stem Cells, Department of Molecular and Cell Biology, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Adrián González-Martín
- CARE-UC, Department of Molecular and Cell Biology, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Alejandra R Alvarez
- CARE-UC, Department of Molecular and Cell Biology, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Hugo Olguín
- Laboratory of Tissue Repair and Adult Stem Cells, Department of Molecular and Cell Biology, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago, Chile
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Tomita H, Cornejo F, Aranda-Pino B, Woodard CL, Rioseco CC, Neel BG, Alvarez AR, Kaplan DR, Miller FD, Cancino GI. The Protein Tyrosine Phosphatase Receptor Delta Regulates Developmental Neurogenesis. Cell Rep 2021; 30:215-228.e5. [PMID: 31914388 DOI: 10.1016/j.celrep.2019.11.033] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 10/10/2019] [Accepted: 11/07/2019] [Indexed: 12/26/2022] Open
Abstract
PTPRD is a receptor protein tyrosine phosphatase that is genetically associated with neurodevelopmental disorders. Here, we asked whether Ptprd mutations cause aberrant neural development by perturbing neurogenesis in the murine cortex. We show that loss of Ptprd causes increases in neurogenic transit-amplifying intermediate progenitor cells and cortical neurons and perturbations in neuronal localization. These effects are intrinsic to neural precursor cells since acute Ptprd knockdown causes similar perturbations. PTPRD mediates these effects by dephosphorylating receptor tyrosine kinases, including TrkB and PDGFRβ, and loss of Ptprd causes the hyperactivation of TrkB and PDGFRβ and their downstream MEK-ERK signaling pathway in neural precursor cells. Moreover, inhibition of aberrant TrkB or MEK activation rescues the increased neurogenesis caused by knockdown or homozygous loss of Ptprd. These results suggest that PTPRD regulates receptor tyrosine kinases to ensure appropriate numbers of intermediate progenitor cells and neurons, suggesting a mechanism for its genetic association with neurodevelopmental disorders.
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Affiliation(s)
- Hideaki Tomita
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto M5G 1X8, ON, Canada
| | - Francisca Cornejo
- Center for Integrative Biology, Facultad de Ciencias, Universidad Mayor, Santiago 8580745, Chile
| | - Begoña Aranda-Pino
- Center for Integrative Biology, Facultad de Ciencias, Universidad Mayor, Santiago 8580745, Chile
| | - Cameron L Woodard
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto M5G 1X8, ON, Canada
| | - Constanza C Rioseco
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto M5G 1X8, ON, Canada
| | - Benjamin G Neel
- Laura and Isaac Perlmutter Cancer Center, New York University Langone Health, New York, NY 10016, USA
| | - Alejandra R Alvarez
- Departamento de Biología Celular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago 8331010, Chile
| | - David R Kaplan
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto M5G 1X8, ON, Canada; Institute of Medical Science, University of Toronto, Toronto M5S 1A8, ON, Canada; Department of Molecular Genetics, University of Toronto, Toronto M5S 1A8, ON, Canada
| | - Freda D Miller
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto M5G 1X8, ON, Canada; Institute of Medical Science, University of Toronto, Toronto M5S 1A8, ON, Canada; Department of Molecular Genetics, University of Toronto, Toronto M5S 1A8, ON, Canada; Department of Physiology, University of Toronto, Toronto M5S 1A8, ON, Canada
| | - Gonzalo I Cancino
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto M5G 1X8, ON, Canada; Center for Integrative Biology, Facultad de Ciencias, Universidad Mayor, Santiago 8580745, Chile.
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8
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Contreras PS, Tapia PJ, González-Hódar L, Peluso I, Soldati C, Napolitano G, Matarese M, Heras ML, Valls C, Martinez A, Balboa E, Castro J, Leal N, Platt FM, Sobota A, Winter D, Klein AD, Medina DL, Ballabio A, Alvarez AR, Zanlungo S. c-Abl Inhibition Activates TFEB and Promotes Cellular Clearance in a Lysosomal Disorder. iScience 2020; 23:101691. [PMID: 33163944 PMCID: PMC7607485 DOI: 10.1016/j.isci.2020.101691] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 09/11/2020] [Accepted: 10/13/2020] [Indexed: 12/12/2022] Open
Abstract
The transcription factor EB (TFEB) has emerged as a master regulator of lysosomal biogenesis, exocytosis, and autophagy, promoting the clearance of substrates stored in cells. c-Abl is a tyrosine kinase that participates in cellular signaling in physiological and pathophysiological conditions. In this study, we explored the connection between c-Abl and TFEB. Here, we show that under pharmacological and genetic c-Abl inhibition, TFEB translocates into the nucleus promoting the expression of its target genes independently of its well-known regulator, mammalian target of rapamycin complex 1. Active c-Abl induces TFEB phosphorylation on tyrosine and the inhibition of this kinase promotes lysosomal biogenesis, autophagy, and exocytosis. c-Abl inhibition in Niemann-Pick type C (NPC) models, a neurodegenerative disease characterized by cholesterol accumulation in lysosomes, promotes a cholesterol-lowering effect in a TFEB-dependent manner. Thus, c-Abl is a TFEB regulator that mediates its tyrosine phosphorylation, and the inhibition of c-Abl activates TFEB promoting cholesterol clearance in NPC models. c-Abl is a TFEB regulator that mediates its tyr phosphorylation c-Abl inhibition promotes TFEB activity independently of mTORC1 c-Abl inhibition reduces cholesterol accumulation in NPC1 models
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Affiliation(s)
- Pablo S Contreras
- Department of Cell & Molecular Biology, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Alameda 340, Santiago 8331010, Chile.,CARE UC Pontificia Universidad Católica de Chile, Santiago, Chile.,Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Alameda 340, Santiago 8331010, Chile
| | - Pablo J Tapia
- Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Alameda 340, Santiago 8331010, Chile
| | - Lila González-Hódar
- Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Alameda 340, Santiago 8331010, Chile
| | - Ivana Peluso
- Telethon Institute of Genetics and Medicine (TIGEM), Via Campi Flegrei 34, 80078 Pozzuoli, Naples, Italy
| | - Chiara Soldati
- Telethon Institute of Genetics and Medicine (TIGEM), Via Campi Flegrei 34, 80078 Pozzuoli, Naples, Italy
| | - Gennaro Napolitano
- Telethon Institute of Genetics and Medicine (TIGEM), Via Campi Flegrei 34, 80078 Pozzuoli, Naples, Italy
| | - Maria Matarese
- Telethon Institute of Genetics and Medicine (TIGEM), Via Campi Flegrei 34, 80078 Pozzuoli, Naples, Italy
| | - Macarena Las Heras
- Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Alameda 340, Santiago 8331010, Chile
| | - Cristian Valls
- Department of Cell & Molecular Biology, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Alameda 340, Santiago 8331010, Chile.,CARE UC Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Alexis Martinez
- Department of Cell & Molecular Biology, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Alameda 340, Santiago 8331010, Chile.,CARE UC Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Elisa Balboa
- Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Alameda 340, Santiago 8331010, Chile
| | - Juan Castro
- Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Alameda 340, Santiago 8331010, Chile
| | - Nancy Leal
- Department of Cell & Molecular Biology, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Alameda 340, Santiago 8331010, Chile.,CARE UC Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Frances M Platt
- Department of Pharmacology, University of Oxford, Oxford, UK
| | - Andrzej Sobota
- Department of Cell Biology, Nencki Institute of Experimental Biology, 3 Pasteur St., 02-093 Warsaw, Poland
| | - Dominic Winter
- Institute for Biochemistry and Molecular Biology, Rheinische-Friedrich-Wilhelms-University, Bonn, Germany
| | - Andrés D Klein
- Centro de Genética y Genómica, Universidad Del Desarrollo Clínica Alemana de Santiago, Chile
| | - Diego L Medina
- Telethon Institute of Genetics and Medicine (TIGEM), Via Campi Flegrei 34, 80078 Pozzuoli, Naples, Italy
| | - Andrea Ballabio
- Telethon Institute of Genetics and Medicine (TIGEM), Via Campi Flegrei 34, 80078 Pozzuoli, Naples, Italy.,Medical Genetics, Department of Pediatrics, Federico II University, Via Pansini 5, 80131 Naples, Italy.,Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA.,Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX 77030, USA
| | - Alejandra R Alvarez
- Department of Cell & Molecular Biology, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Alameda 340, Santiago 8331010, Chile.,CARE UC Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Silvana Zanlungo
- Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Alameda 340, Santiago 8331010, Chile
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9
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Yañez MJ, Marín T, Balboa E, Klein AD, Alvarez AR, Zanlungo S. Finding pathogenic commonalities between Niemann-Pick type C and other lysosomal storage disorders: Opportunities for shared therapeutic interventions. Biochim Biophys Acta Mol Basis Dis 2020; 1866:165875. [PMID: 32522631 DOI: 10.1016/j.bbadis.2020.165875] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 05/06/2020] [Accepted: 06/03/2020] [Indexed: 12/12/2022]
Abstract
Lysosomal storage disorders (LSDs) are diseases characterized by the accumulation of macromolecules in the late endocytic system and are caused by inherited defects in genes that encode mainly lysosomal enzymes or transmembrane lysosomal proteins. Niemann-Pick type C disease (NPCD), a LSD characterized by liver damage and progressive neurodegeneration that leads to early death, is caused by mutations in the genes encoding the NPC1 or NPC2 proteins. Both proteins are involved in the transport of cholesterol from the late endosomal compartment to the rest of the cell. Loss of function of these proteins causes primary cholesterol accumulation, and secondary accumulation of other lipids, such as sphingolipids, in lysosomes. Despite years of studying the genetic and molecular bases of NPCD and related-lysosomal disorders, the pathogenic mechanisms involved in these diseases are not fully understood. In this review we will summarize the pathogenic mechanisms described for NPCD and we will discuss their relevance for other LSDs with neurological components such as Niemann- Pick type A and Gaucher diseases. We will particularly focus on the activation of signaling pathways that may be common to these three pathologies with emphasis on how the intra-lysosomal accumulation of lipids leads to pathology, specifically to neurological impairments. We will show that although the primary lipid storage defect is different in these three LSDs, there is a similar secondary accumulation of metabolites and activation of signaling pathways that can lead to common pathogenic mechanisms. This analysis might help to delineate common pathological mechanisms and therapeutic targets for lysosomal storage diseases.
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Affiliation(s)
- M J Yañez
- Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - T Marín
- Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - E Balboa
- Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - A D Klein
- Centro de Genética y Genómica, Facultad de Medicina, Clínica Alemana Universidad del Desarrollo, Santiago, Chile
| | - A R Alvarez
- Laboratory of Cell Signaling, Department of Cellular and Molecular Biology, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Santiago, Chile; CARE UC, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - S Zanlungo
- Department of Gastroenterology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.
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10
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Gutierrez DA, Vargas LM, Chandia-Cristi A, de la Fuente C, Leal N, Alvarez AR. c-Abl Deficiency Provides Synaptic Resiliency Against Aβ-Oligomers. Front Cell Neurosci 2019; 13:526. [PMID: 31849613 PMCID: PMC6902026 DOI: 10.3389/fncel.2019.00526] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 11/11/2019] [Indexed: 12/13/2022] Open
Abstract
Spine pathology has been implicated in the early onset of Alzheimer’s disease (AD), where Aβ-Oligomers (AβOs) cause synaptic dysfunction and loss. Previously, we described that pharmacological inhibition of c-Abl prevents AβOs-induced synaptic alterations. Hence, this kinase seems to be a key element in AD progression. Here, we studied the role of c-Abl on dendritic spine morphological changes induced by AβOs using c-Abl null neurons (c-Abl-KO). First, we characterized the effect of c-Abl deficiency on dendritic spine density and found that its absence increases dendritic spine density. While AβOs-treatment reduces the spine number in both wild-type (WT) and c-Abl-KO neurons, AβOs-driven spine density loss was not affected by c-Abl. We then characterized AβOs-induced morphological changes in dendritic spines of c-Abl-KO neurons. AβOs induced a decrease in the number of mushroom spines in c-Abl-KO neurons while preserving the populations of immature stubby, thin, and filopodia spines. Furthermore, synaptic contacts evaluated by PSD95/Piccolo clustering and cell viability were preserved in AβOs-exposed c-Abl-KO neurons. In conclusion, our results indicate that in the presence of AβOs c-Abl participates in synaptic contact removal, increasing susceptibility to AβOs damage. Its deficiency increases the immature spine population reducing AβOs-induced synapse elimination. Therefore, c-Abl signaling could be a relevant actor in the early stages of AD.
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Affiliation(s)
- Daniela A Gutierrez
- Cell Signaling Laboratory, Faculty of Biological Science, Department of Cell and Molecular Biology, Center for Aging and Regeneration (CARE), Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Lina M Vargas
- Cell Signaling Laboratory, Faculty of Biological Science, Department of Cell and Molecular Biology, Center for Aging and Regeneration (CARE), Pontificia Universidad Católica de Chile, Santiago, Chile
| | - América Chandia-Cristi
- Cell Signaling Laboratory, Faculty of Biological Science, Department of Cell and Molecular Biology, Center for Aging and Regeneration (CARE), Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Catalina de la Fuente
- Cell Signaling Laboratory, Faculty of Biological Science, Department of Cell and Molecular Biology, Center for Aging and Regeneration (CARE), Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Nancy Leal
- Cell Signaling Laboratory, Faculty of Biological Science, Department of Cell and Molecular Biology, Center for Aging and Regeneration (CARE), Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Alejandra R Alvarez
- Cell Signaling Laboratory, Faculty of Biological Science, Department of Cell and Molecular Biology, Center for Aging and Regeneration (CARE), Pontificia Universidad Católica de Chile, Santiago, Chile
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11
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Morales-Zavala F, Casanova-Morales N, Gonzalez RB, Chandía-Cristi A, Estrada LD, Alvizú I, Waselowski V, Guzman F, Guerrero S, Oyarzún-Olave M, Rebolledo C, Rodriguez E, Armijo J, Bhuyan H, Favre M, Alvarez AR, Kogan MJ, Maze JR. Functionalization of stable fluorescent nanodiamonds towards reliable detection of biomarkers for Alzheimer's disease. J Nanobiotechnology 2018; 16:60. [PMID: 30097010 PMCID: PMC6085760 DOI: 10.1186/s12951-018-0385-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Accepted: 07/20/2018] [Indexed: 01/01/2023] Open
Abstract
Background Stable and non-toxic fluorescent markers are gaining attention in molecular diagnostics as powerful tools for enabling long and reliable biological studies. Such markers should not only have a long half-life under several assay conditions showing no photo bleaching or blinking but also, they must allow for their conjugation or functionalization as a crucial step for numerous applications such as cellular tracking, biomarker detection and drug delivery. Results We report the functionalization of stable fluorescent markers based on nanodiamonds (NDs) with a bifunctional peptide. This peptide is made of a cell penetrating peptide and a six amino acids long β-sheet breaker peptide that is able to recognize amyloid β (Aβ) aggregates, a biomarker for the Alzheimer disease. Our results indicate that functionalized NDs (fNDs) are not cytotoxic and can be internalized by the cells. The fNDs allow ultrasensitive detection (at picomolar concentrations of NDs) of in vitro amyloid fibrils and amyloid aggregates in AD mice brains. Conclusions The fluorescence of functionalized NDs is more stable than that of fluorescent markers commonly used to
stain Aβ aggregates such as Thioflavin T. These results pave the way for performing ultrasensitive and reliable detection of Aβ aggregates involved in the pathogenesis of the Alzheimer disease. Electronic supplementary material The online version of this article (10.1186/s12951-018-0385-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Francisco Morales-Zavala
- Department of Pharmacological and Toxicological Chemistry, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile.,Advanced Center for Chronic Diseases (ACCDiS), Santiago, Chile
| | | | - Raúl B Gonzalez
- Institute of Physics, Pontificia Universidad Católica de Chile, Santiago, 7820436, Chile
| | - América Chandía-Cristi
- Department of Cellular & Molecular Biology, Pontificia Universidad Católica de Chile, Santiago, Chile
| | | | - Ignacio Alvizú
- Institute of Physics, Pontificia Universidad Católica de Chile, Santiago, 7820436, Chile
| | - Victor Waselowski
- Institute of Physics, Pontificia Universidad Católica de Chile, Santiago, 7820436, Chile
| | - Fanny Guzman
- Núcleo de Biotecnología Curauma, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Simón Guerrero
- Department of Pharmacological and Toxicological Chemistry, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile.,Advanced Center for Chronic Diseases (ACCDiS), Santiago, Chile
| | - Marisol Oyarzún-Olave
- Department of Cellular & Molecular Biology, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Cristian Rebolledo
- Institute of Physics, Pontificia Universidad Católica de Chile, Santiago, 7820436, Chile
| | - Enrique Rodriguez
- Institute of Physics, Pontificia Universidad Católica de Chile, Santiago, 7820436, Chile
| | - Julien Armijo
- Institute of Physics, Pontificia Universidad Católica de Chile, Santiago, 7820436, Chile.,Centro de Investigación en Recursos Naturales y Sustentabilidad, Universidad Bernardo O'Higgins, Santiago, Chile
| | - Heman Bhuyan
- Institute of Physics, Pontificia Universidad Católica de Chile, Santiago, 7820436, Chile
| | - Mario Favre
- Institute of Physics, Pontificia Universidad Católica de Chile, Santiago, 7820436, Chile
| | - Alejandra R Alvarez
- Department of Cellular & Molecular Biology, Pontificia Universidad Católica de Chile, Santiago, Chile. .,Center for Nanoscale Technology and Advanced Materials, Pontificia Universidad Catolica de Chile, Santiago, Chile. .,CARE-Chile-UC, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Marcelo J Kogan
- Department of Pharmacological and Toxicological Chemistry, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile. .,Advanced Center for Chronic Diseases (ACCDiS), Santiago, Chile.
| | - Jerónimo R Maze
- Institute of Physics, Pontificia Universidad Católica de Chile, Santiago, 7820436, Chile. .,Center for Nanoscale Technology and Advanced Materials, Pontificia Universidad Catolica de Chile, Santiago, Chile.
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12
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Estrada LD, Chamorro D, Yañez MJ, Gonzalez M, Leal N, von Bernhardi R, Dulcey AE, Marugan J, Ferrer M, Soto C, Zanlungo S, Inestrosa NC, Alvarez AR. Reduction of Blood Amyloid-β Oligomers in Alzheimer's Disease Transgenic Mice by c-Abl Kinase Inhibition. J Alzheimers Dis 2018; 54:1193-1205. [PMID: 27567806 DOI: 10.3233/jad-151087] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
One of the pathological hallmarks of Alzheimer's disease (AD) is the presence of amyloid plaques, which are deposits of misfolded and aggregated amyloid-beta peptide (Aβ). The role of the c-Abl tyrosine kinase in Aβ-mediated neurodegeneration has been previously reported. Here, we investigated the therapeutic potential of inhibiting c-Abl using imatinib. We developed a novel method, based on a technique used to detect prions (PMCA), to measure minute amounts of misfolded-Aβ in the blood of AD transgenic mice. We found that imatinib reduces Aβ-oligomers in plasma, which correlates with a reduction of AD brain features such as plaques and oligomers accumulation, neuroinflammation, and cognitive deficits. Cells exposed to imatinib and c-Abl KO mice display decreased levels of β-CTF fragments, suggesting that an altered processing of the amyloid-beta protein precursor is the most probable mechanism behind imatinib effects. Our findings support the role of c-Abl in Aβ accumulation and AD, and propose AD-PMCA as a new tool to evaluate AD progression and screening for drug candidates.
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Affiliation(s)
- Lisbell D Estrada
- Cell Signaling Laboratory, Cell and Molecular Biology Department, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Chile.,Centro de Envejecimiento y Regeneración (CARE), Departamento de Biología Celular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Chile.,Laboratorio Bionanotecnologia, Facultad de Salud, Universidad Bernardo O Higgins, Chile
| | - David Chamorro
- Cell Signaling Laboratory, Cell and Molecular Biology Department, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Chile
| | - María José Yañez
- Cell Signaling Laboratory, Cell and Molecular Biology Department, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Chile
| | - Marcelo Gonzalez
- Cell Signaling Laboratory, Cell and Molecular Biology Department, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Chile
| | - Nancy Leal
- Cell Signaling Laboratory, Cell and Molecular Biology Department, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Chile
| | - Rommy von Bernhardi
- Department of Neurology, School of Medicine, Pontificia Universidad Católica de Chile, Chile
| | - Andrés E Dulcey
- National Center for Advancing Translational Science (NACTS), NIH, Bethesda, MD, USA
| | - Juan Marugan
- National Center for Advancing Translational Science (NACTS), NIH, Bethesda, MD, USA
| | - Marc Ferrer
- National Center for Advancing Translational Science (NACTS), NIH, Bethesda, MD, USA
| | - Claudio Soto
- Mitchell Center for Alzheimer's Disease and Related Brain Disorders, University of Texas Medical School at Houston, Houston, TX, USA
| | - Silvana Zanlungo
- Gastroentorology Department, School of Medicine, Pontificia Universidad Católica de Chile, Chile
| | - Nibaldo C Inestrosa
- Centro de Envejecimiento y Regeneración (CARE), Departamento de Biología Celular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Chile.,Centre for Healthy Brain Ageing, School of Psychiatry, Faculty of Medicine, University of New South Wales, Australia.,Centro de Excelencia en Biomedicina de Magallanes (CEBIMA), Universidad de Magallanes, Chile
| | - Alejandra R Alvarez
- Cell Signaling Laboratory, Cell and Molecular Biology Department, Biological Sciences Faculty, Pontificia Universidad Católica de Chile, Chile.,Centro de Envejecimiento y Regeneración (CARE), Departamento de Biología Celular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Chile
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13
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Ill-Raga G, Tajes M, Busquets-García A, Ramos-Fernández E, Vargas LM, Bosch-Morató M, Guivernau B, Valls-Comamala V, Eraso-Pichot A, Guix FX, Fandos C, Rosen MD, Rabinowitz MH, Maldonado R, Alvarez AR, Ozaita A, Muñoz FJ. Physiological Control of Nitric Oxide in Neuronal BACE1 Translation by Heme-Regulated eIF2α Kinase HRI Induces Synaptogenesis. Antioxid Redox Signal 2015; 22:1295-307. [PMID: 25706765 DOI: 10.1089/ars.2014.6080] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
AIMS Hippocampus is the brain center for memory formation, a process that requires synaptogenesis. However, hippocampus is dramatically compromised in Alzheimer's disease due to the accumulation of amyloid β-peptide, whose production is initiated by β-site APP Cleaving Enzyme 1 (BACE1). It is known that pathological stressors activate BACE1 translation through the phosphorylation of the eukaryotic initiation factor-2α (eIF2α) by GCN2, PERK, or PKR kinases, leading to amyloidogenesis. However, BACE1 physiological regulation is still unclear. Since nitric oxide (NO) participates directly in hippocampal glutamatergic signaling, we investigated the neuronal role of the heme-regulated eukaryotic initiation factor eIF2α kinase (HRI), which can bind NO by a heme group, in BACE1 translation and its physiological consequences. RESULTS We found that BACE1 is expressed on glutamate activation with NO being the downstream effector by triggering eIF2α phosphorylation, as it was obtained by Western blot and luciferase assay. It is due to the activation of HRI by NO as assayed by Western blot and immunofluorescence with an HRI inhibitor and HRI siRNA. BACE1 expression was early detected at synaptic spines, contributing to spine growth and consolidating the hippocampal memory as assayed with mice treated with HRI or neuronal NO synthase inhibitors. INNOVATION We provide the first description that HRI and eIF2α are working in physiological conditions in the brain under the control of nitric oxide and glutamate signaling, and also that BACE1 has a physiological role in hippocampal function. CONCLUSION We conclude that BACE1 translation is controlled by NO through HRI in glutamatergic hippocampal synapses, where it plays physiological functions, allowing the spine growth and memory consolidation.
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Affiliation(s)
- Gerard Ill-Raga
- 1 Laboratory of Molecular Physiology and Channelopathies, Universitat Pompeu Fabra , Barcelona, Spain
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14
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Gonzalez-Zuñiga M, Contreras PS, Estrada LD, Chamorro D, Villagra A, Zanlungo S, Seto E, Alvarez AR. c-Abl stabilizes HDAC2 levels by tyrosine phosphorylation repressing neuronal gene expression in Alzheimer's disease. Mol Cell 2014; 56:163-73. [PMID: 25219501 DOI: 10.1016/j.molcel.2014.08.013] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Revised: 07/02/2014] [Accepted: 08/07/2014] [Indexed: 10/24/2022]
Abstract
In Alzheimer's disease (AD), there is a decrease in neuronal gene expression induced by HDAC2 increase; however, the mechanisms involved are not fully elucidated. Here, we described how the tyrosine kinase c-Abl increases HDAC2 levels, inducing transcriptional repression of synaptic genes. Our data demonstrate that (1) in neurons, c-Abl inhibition with Imatinib prevents the AβO-induced increase in HDAC2 levels; (2) c-Abl knockdown cells show a decrease in HDAC2 levels, while c-Abl overexpression increases them; (3) c-Abl inhibition reduces HDAC2-dependent repression activity and HDAC2 recruitment to the promoter of several synaptic genes, increasing their expression; (4) c-Abl induces tyrosine phosphorylation of HDAC2, a posttranslational modification, affecting both its stability and repression activity; and (5) treatment with Imatinib decreases HDAC2 levels in a transgenic mice model of AD. Our results support the participation of the c-Abl/HDAC2 signaling pathway in the epigenetic blockade of gene expression in AD pathology.
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Affiliation(s)
- Marcelo Gonzalez-Zuñiga
- Department of Cell & Molecular Biology, Pontificia Universidad Católica de Chile, Santiago 8331010, Chile; Biological and Chemistry Sciences Department, Universidad Bernardo O'Higgins, Santiago 8370993, Chile
| | - Pablo S Contreras
- Department of Cell & Molecular Biology, Pontificia Universidad Católica de Chile, Santiago 8331010, Chile; Department of Gastroenterology, Pontificia Universidad Católica de Chile, Santiago 8331010, Chile
| | - Lisbell D Estrada
- Department of Cell & Molecular Biology, Pontificia Universidad Católica de Chile, Santiago 8331010, Chile; Biological and Chemistry Sciences Department, Universidad Bernardo O'Higgins, Santiago 8370993, Chile
| | - David Chamorro
- Department of Cell & Molecular Biology, Pontificia Universidad Católica de Chile, Santiago 8331010, Chile
| | - Alejandro Villagra
- Department of Immunology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, USA
| | - Silvana Zanlungo
- Department of Gastroenterology, Pontificia Universidad Católica de Chile, Santiago 8331010, Chile
| | - Edward Seto
- Department of Molecular Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, USA
| | - Alejandra R Alvarez
- Department of Cell & Molecular Biology, Pontificia Universidad Católica de Chile, Santiago 8331010, Chile.
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15
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M. Vargas L, Leal N, Estrada LD, González A, Serrano F, Araya K, Gysling K, Inestrosa NC, Pasquale EB, Alvarez AR. EphA4 activation of c-Abl mediates synaptic loss and LTP blockade caused by amyloid-β oligomers. PLoS One 2014; 9:e92309. [PMID: 24658113 PMCID: PMC3962387 DOI: 10.1371/journal.pone.0092309] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [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: 10/25/2013] [Accepted: 02/21/2014] [Indexed: 01/04/2023] Open
Abstract
The early stages of Alzheimer's disease are characterised by impaired synaptic plasticity and synapse loss. Here, we show that amyloid-β oligomers (AβOs) activate the c-Abl kinase in dendritic spines of cultured hippocampal neurons and that c-Abl kinase activity is required for AβOs-induced synaptic loss. We also show that the EphA4 receptor tyrosine kinase is upstream of c-Abl activation by AβOs. EphA4 tyrosine phosphorylation (activation) is increased in cultured neurons and synaptoneurosomes exposed to AβOs, and in Alzheimer-transgenic mice brain. We do not detect c-Abl activation in EphA4-knockout neurons exposed to AβOs. More interestingly, we demonstrate EphA4/c-Abl activation is a key-signalling event that mediates the synaptic damage induced by AβOs. According to this results, the EphA4 antagonistic peptide KYL and c-Abl inhibitor STI prevented i) dendritic spine reduction, ii) the blocking of LTP induction and iii) neuronal apoptosis caused by AβOs. Moreover, EphA4-/- neurons or sh-EphA4-transfected neurons showed reduced synaptotoxicity by AβOs. Our results are consistent with EphA4 being a novel receptor that mediates synaptic damage induced by AβOs. EphA4/c-Abl signalling could be a relevant pathway involved in the early cognitive decline observed in Alzheimer's disease patients.
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Affiliation(s)
- Lina M. Vargas
- Departamento de Biología Celular y Molecular, Laboratorio de Señalización Celular, Facultad de Ciencias Biológicas, P. Universidad Católica de Chile, Santiago, Chile
| | - Nancy Leal
- Departamento de Biología Celular y Molecular, Laboratorio de Señalización Celular, Facultad de Ciencias Biológicas, P. Universidad Católica de Chile, Santiago, Chile
| | - Lisbell D. Estrada
- Departamento de Biología Celular y Molecular, Laboratorio de Señalización Celular, Facultad de Ciencias Biológicas, P. Universidad Católica de Chile, Santiago, Chile
| | - Adrian González
- Departamento de Biología Celular y Molecular, Laboratorio de Señalización Celular, Facultad de Ciencias Biológicas, P. Universidad Católica de Chile, Santiago, Chile
| | - Felipe Serrano
- Departamento de Biología Celular y Molecular, Centro de Envejecimiento y Regeneración (CARE), Facultad de Ciencias Biológicas, P. Universidad Católica de Chile, Santiago, Chile
| | - Katherine Araya
- Departamento de Biología Celular y Molecular, Millenium Nucleus in Stress and Addiction, Facultad de Ciencias Biológicas, P. Universidad Católica de Chile, Santiago, Chile
| | - Katia Gysling
- Departamento de Biología Celular y Molecular, Millenium Nucleus in Stress and Addiction, Facultad de Ciencias Biológicas, P. Universidad Católica de Chile, Santiago, Chile
| | - Nibaldo C. Inestrosa
- Departamento de Biología Celular y Molecular, Centro de Envejecimiento y Regeneración (CARE), Facultad de Ciencias Biológicas, P. Universidad Católica de Chile, Santiago, Chile
| | - Elena B. Pasquale
- Sanford-Burnham Medical Research Institute, La Jolla, California, United States of America
| | - Alejandra R. Alvarez
- Departamento de Biología Celular y Molecular, Laboratorio de Señalización Celular, Facultad de Ciencias Biológicas, P. Universidad Católica de Chile, Santiago, Chile
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Estrada LD, Zanlungo SM, Alvarez AR. C-Abl tyrosine kinase signaling: a new player in AD tau pathology. Curr Alzheimer Res 2012; 8:643-51. [PMID: 21605041 DOI: 10.2174/156720511796717249] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Revised: 04/20/2011] [Accepted: 04/29/2011] [Indexed: 11/22/2022]
Abstract
Hyperphosphorylated tau is a cardinal feature of Alzheimer's disease (AD) pathology. The deregulation of kinases that phosphorylate tau can alter normal tau-related processes, including microtubule dynamics, growth cones, and axonal transport, and induce tau aggregation in paired helical filaments. Here we discuss the possible roles of the Abl family of tyrosine kinases, which are essential regulators of cytoskeleton cellular signaling cascades, in AD tau pathology and how the physiological roles of Abl kinases could be connected with the cytoskeletal alterations induced by Aβ aggregates and AD progression.
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Affiliation(s)
- L D Estrada
- Departamento de Biología Celular y Molecular, Pontificia Universidad Católica de Chile, Santiago, Chile
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17
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Vázquez MC, Martínez P, Alvarez AR, González M, Zanlungo S. Increased copper levels in in vitro and in vivo models of Niemann-Pick C disease. Biometals 2012; 25:777-86. [DOI: 10.1007/s10534-012-9546-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Accepted: 03/30/2012] [Indexed: 11/29/2022]
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18
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Cabeza C, Figueroa A, Lazo OM, Galleguillos C, Pissani C, Klein A, Gonzalez-Billault C, Inestrosa NC, Alvarez AR, Zanlungo S, Bronfman FC. Cholinergic abnormalities, endosomal alterations and up-regulation of nerve growth factor signaling in Niemann-Pick type C disease. Mol Neurodegener 2012; 7:11. [PMID: 22458984 PMCID: PMC3395862 DOI: 10.1186/1750-1326-7-11] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Accepted: 03/29/2012] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Neurotrophins and their receptors regulate several aspects of the developing and mature nervous system, including neuronal morphology and survival. Neurotrophin receptors are active in signaling endosomes, which are organelles that propagate neurotrophin signaling along neuronal processes. Defects in the Npc1 gene are associated with the accumulation of cholesterol and lipids in late endosomes and lysosomes, leading to neurodegeneration and Niemann-Pick type C (NPC) disease. The aim of this work was to assess whether the endosomal and lysosomal alterations observed in NPC disease disrupt neurotrophin signaling. As models, we used i) NPC1-deficient mice to evaluate the central cholinergic septo-hippocampal pathway and its response to nerve growth factor (NGF) after axotomy and ii) PC12 cells treated with U18666A, a pharmacological cellular model of NPC, stimulated with NGF. RESULTS NPC1-deficient cholinergic cells respond to NGF after axotomy and exhibit increased levels of choline acetyl transferase (ChAT), whose gene is under the control of NGF signaling, compared to wild type cholinergic neurons. This finding was correlated with increased ChAT and phosphorylated Akt in basal forebrain homogenates. In addition, we found that cholinergic neurons from NPC1-deficient mice had disrupted neuronal morphology, suggesting early signs of neurodegeneration. Consistently, PC12 cells treated with U18666A presented a clear NPC cellular phenotype with a prominent endocytic dysfunction that includes an increased size of TrkA-containing endosomes and reduced recycling of the receptor. This result correlates with increased sensitivity to NGF, and, in particular, with up-regulation of the Akt and PLC-γ signaling pathways, increased neurite extension, increased phosphorylation of tau protein and cell death when PC12 cells are differentiated and treated with U18666A. CONCLUSIONS Our results suggest that the NPC cellular phenotype causes neuronal dysfunction through the abnormal up-regulation of survival pathways, which causes the perturbation of signaling cascades and anomalous phosphorylation of the cytoskeleton.
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Affiliation(s)
- Carolina Cabeza
- Physiology Department, Millennium Nucleus in Regenerative Biology, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago, Chile
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Blanco EH, Zúñiga JP, Andrés ME, Alvarez AR, Gysling K. Corticotropin-releasing factor binding protein enters the regulated secretory pathway in neuroendocrine cells and cortical neurons. Neuropeptides 2011; 45:273-9. [PMID: 21624661 DOI: 10.1016/j.npep.2011.05.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [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: 11/23/2010] [Revised: 05/06/2011] [Accepted: 05/07/2011] [Indexed: 11/21/2022]
Abstract
Corticotropin releasing factor binding protein (CRF-BP) is a 37kDa glycoprotein that binds CRF with high affinity. CRF-BP controls CRF levels within plasma during human pregnancy. It has also been shown that CRF-BP is expressed in various brain nuclei. Main actions that have been proposed for brain CRF-BP are either decreasing available CRF or facilitating CRF ligand-induced activation of CRF-R2 receptors. For both actions, it is necessary the release of CRF-BP from CRF-BP expressing neurons. However, the secretion mode of CRF-BP is currently unknown. We used heterologous expression of CRF-BP-Flag in PC12 cells and in primary culture of rat cortical neurons to study CRF-BP secretion mode. We observed that CRF-BP-Flag immunoreactivity presents the typical cytoplasmatic punctuate pattern that has been described for neuropeptides and proteins that enter the regulated secretory pathway in PC12 cells. Quantitative analysis of double immunofluorescence confocal images showed that CRF-BP-Flag colocalizes with secretogranin II, marker of secretory granules, both in PC12 and in primary-cultured rat neurons. Furthermore, CRF-BP-Flag is released from PC12 cells upon high K(+)-depolarization. Thus, our results show that CRF-BP is efficiently sorted to the regulated secretory pathway in two cellular contexts, suggesting that the extracellular levels of CRF-BP in the central nervous system depends on neuronal activity.
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Affiliation(s)
- Elías H Blanco
- Millenium Nucleus in Stress and Addiction, Departamento de Biología Celular y Molecular, Pontificia Universidad Católica de Chile, Santiago
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20
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Klein A, Maldonado C, Vargas LM, Gonzalez M, Robledo F, Perez de Arce K, Muñoz FJ, Hetz C, Alvarez AR, Zanlungo S. Oxidative stress activates the c-Abl/p73 proapoptotic pathway in Niemann-Pick type C neurons. Neurobiol Dis 2011; 41:209-18. [DOI: 10.1016/j.nbd.2010.09.008] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2009] [Revised: 09/11/2010] [Accepted: 09/19/2010] [Indexed: 11/30/2022] Open
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21
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Klein A, Mosqueira M, Martínez G, Robledo F, González M, Caballero B, Cancino GI, Alvarez AR, Hetz C, Zanlungo S. Lack of activation of the unfolded protein response in mouse and cellular models of Niemann-Pick type C disease. NEURODEGENER DIS 2010; 8:124-8. [PMID: 20714112 DOI: 10.1159/000316540] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2010] [Accepted: 06/03/2010] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Niemann-Pick type C (NPC) disease is a fatal lysosomal storage disease related to progressive neurodegeneration secondary to abnormal intracellular accumulation of cholesterol. Signs of endoplasmic reticulum (ER) stress have been reported in other lipidoses. Adaptation to ER stress is mediated by the unfolded protein response (UPR), an integrated signal transduction pathway that attenuates stress or triggers apoptosis of irreversibly damaged cells. OBJECTIVE To investigate the possible engagement of ER stress responses in NPC models. METHODS We used NPC1 deficient mice and an NPC cell-based model by knocking down the expression of NPC1 to measure several UPR markers through different approaches. RESULTS Despite expectations that the UPR will be activated in NPC, our results indicate a lack of ER stress reactions in the cerebellum of symptomatic mice. Similarly, knocking down NPC1 in Neuro2a cells leads to clear cholesterol accumulation without evidence of UPR activation. CONCLUSION Our results suggest that cholesterol overload and neuronal dysfunction in NPC is not associated with ER stress, which contrasts with recent reports suggesting the activation of the UPR in other lysosomal storage diseases.
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Affiliation(s)
- Andres Klein
- Departamento de Gastroenterología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
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22
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Alvarez AR, Perez de Arce KG, Cancino GI. P2‐214: c‐Abl kinase activation regulates both the neuronal death and the tau phosphorylation in Alzhemier's disease models. Alzheimers Dement 2010. [DOI: 10.1016/j.jalz.2010.05.1263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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23
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Varela-Nallar L, Grabowski CP, Alfaro IE, Alvarez AR, Inestrosa NC. Role of the Wnt receptor Frizzled-1 in presynaptic differentiation and function. Neural Dev 2009; 4:41. [PMID: 19883499 PMCID: PMC2779803 DOI: 10.1186/1749-8104-4-41] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.7] [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: 06/09/2009] [Accepted: 11/02/2009] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND The Wnt signaling pathway regulates several fundamental developmental processes and recently has been shown to be involved in different aspects of synaptic differentiation and plasticity. Some Wnt signaling components are localized at central synapses, and it is thus possible that this pathway could be activated at the synapse. RESULTS We examined the distribution of the Wnt receptor Frizzled-1 in cultured hippocampal neurons and determined that this receptor is located at synaptic contacts co-localizing with presynaptic proteins. Frizzled-1 was found in functional synapses detected with FM1-43 staining and in synaptic terminals from adult rat brain. Interestingly, overexpression of Frizzled-1 increased the number of clusters of Bassoon, a component of the active zone, while treatment with the extracellular cysteine-rich domain (CRD) of Frizzled-1 decreased Bassoon clustering, suggesting a role for this receptor in presynaptic differentiation. Consistent with this, treatment with the Frizzled-1 ligand Wnt-3a induced presynaptic protein clustering and increased functional presynaptic recycling sites, and these effects were prevented by co-treatment with the CRD of Frizzled-1. Moreover, in synaptically mature neurons Wnt-3a was able to modulate the kinetics of neurotransmitter release. CONCLUSION Our results indicate that the activation of the Wnt pathway through Frizzled-1 occurs at the presynaptic level, and suggest that the synaptic effects of the Wnt signaling pathway could be modulated by local activation through synaptic Frizzled receptors.
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Affiliation(s)
- Lorena Varela-Nallar
- Centro de Envejecimiento y Regeneración (CARE), Centro de Regulación Celular y Patología "Joaquín V Luco" (CRCP) and MIFAB, Chile
- Laboratorio de Señalización Celular, Departamento de Biología Celular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Catalina P Grabowski
- Centro de Envejecimiento y Regeneración (CARE), Centro de Regulación Celular y Patología "Joaquín V Luco" (CRCP) and MIFAB, Chile
| | - Iván E Alfaro
- Centro de Envejecimiento y Regeneración (CARE), Centro de Regulación Celular y Patología "Joaquín V Luco" (CRCP) and MIFAB, Chile
| | - Alejandra R Alvarez
- Laboratorio de Señalización Celular, Departamento de Biología Celular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Nibaldo C Inestrosa
- Centro de Envejecimiento y Regeneración (CARE), Centro de Regulación Celular y Patología "Joaquín V Luco" (CRCP) and MIFAB, Chile
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Vázquez MC, Vargas LM, Inestrosa NC, Alvarez AR. c-Abl modulates AICD dependent cellular responses: transcriptional induction and apoptosis. J Cell Physiol 2009; 220:136-43. [PMID: 19306298 DOI: 10.1002/jcp.21743] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
APP intracellular domain (AICD) has been proposed as a transcriptional inductor that moves to the nucleus with the adaptor protein Fe65 and regulates transcription. The two proteins, APP and Fe65, can be phosphorylated by c-Abl kinase. Neprilysin has been proposed as a target gene for AICD. We found that AICD expression is decreased by treatment with STI-571, a c-Abl inhibitor, suggesting a modulation of AICD transcription by c-Abl kinase. We observed interaction between c-Abl kinase, the AICD fragment and the Fe65 adaptor protein. In addition, STI-571 reduces apoptosis in APPSw, and the apoptotic response induced by Fe65 over-expression was inhibited by with the expression of a kinase dead (KD) c-Abl and enhanced by over-expression of WT-c-Abl. However, in the APPSw cells, the ability of the KD-c-Abl to protect against Fe65 was reduced. Finally, in APPSw clone, we detected higher trans-activation of the pro-apoptotic p73 isoform, TAp73 promoter. Our results show that c-Abl modulates AICD dependent cellular responses, transcriptional induction as well as the apoptotic response, which could participate in the onset and progression of the neurodegenerative pathology, observed in Alzheimer's disease (AD).
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Affiliation(s)
- Mary C Vázquez
- Department of Cellular and Molecular Biology, Faculty of Biological Sciences, Pontifical Catholic University of Chile, Santiago, Chile
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25
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Alvarez AR, Klein A, Castro J, Cancino GI, Amigo J, Mosqueira M, Vargas LM, Yévenes LF, Bronfman FC, Zanlungo S. Imatinib therapy blocks cerebellar apoptosis and improves neurological symptoms in a mouse model of Niemann-Pick type C disease. FASEB J 2008; 22:3617-27. [PMID: 18591368 DOI: 10.1096/fj.07-102715] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Niemann-Pick type C (NPC) disease is a fatal autosomal recessive disorder characterized by the accumulation of free cholesterol and glycosphingolipids in the endosomal-lysosomal system. Patients with NPC disease have markedly progressive neuronal loss, mainly of cerebellar Purkinje neurons. There is strong evidence indicating that cholesterol accumulation and trafficking defects activate apoptosis in NPC brains. The purpose of this study was to analyze the relevance of apoptosis and particularly the proapoptotic c-Abl/p73 system in cerebellar neuron degeneration in NPC disease. We used the NPC1 mouse model to evaluate c-Abl/p73 expression and activation in the cerebellum and the effect of therapy with the c-Abl-specific inhibitor imatinib. The proapoptotic c-Abl/p73 system and the p73 target genes are expressed in the cerebellums of NPC mice. Furthermore, inhibition of c-Abl with imatinib preserved Purkinje neurons and reduced general cell apoptosis in the cerebellum, improved neurological symptoms, and increased the survival of NPC mice. Moreover, this prosurvival effect correlated with reduced mRNA levels of p73 proapoptotic target genes. Our results suggest that the c-Abl/p73 pathway is involved in NPC neurodegeneration and show that treatment with c-Abl inhibitors is useful in delaying progressive neurodegeneration, supporting the use of imatinib for clinical treatment of patients with NPC disease.
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Affiliation(s)
- Alejandra R Alvarez
- Departamento de Biología Celular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Alameda 340, casilla 114-D, Santiago, Chile.
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26
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Cancino GI, Toledo EM, Leal NR, Hernandez DE, Yévenes LF, Inestrosa NC, Alvarez AR. STI571 prevents apoptosis, tau phosphorylation and behavioural impairments induced by Alzheimer's β-amyloid deposits. Brain 2008; 131:2425-42. [DOI: 10.1093/brain/awn125] [Citation(s) in RCA: 114] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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27
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Alvarez AR, Sandoval PC, Leal NR, Castro PU, Kosik KS. Activation of the neuronal c-Abl tyrosine kinase by amyloid-β-peptide and reactive oxygen species. Neurobiol Dis 2004; 17:326-36. [PMID: 15474370 DOI: 10.1016/j.nbd.2004.06.007] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.9] [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: 01/12/2004] [Revised: 06/16/2004] [Accepted: 06/22/2004] [Indexed: 11/24/2022] Open
Abstract
The deposition and accumulation of amyloid-beta-peptide (Abeta) in the brain are considered a sine qua non for Alzheimer's disease. The experimental delivery of fibrilized Abeta serves as a cellular model for several facets of the disease including the induction of synaptic dysfunction and apoptosis. c-Abl kinase is involved in the regulation of apoptosis and its pro-apoptotic function is in part mediated by its interaction with p73, a p53 homologue. We found that c-Abl activation is involved in cell signals that regulate neuronal death response to Abeta fibrils. Abeta peptide fibrils induced an increase of the c-Abl activity in rat hippocampal neurons as well as an increase in nuclear p73 protein levels and the p73-c-Abl complex. The neuronal cell death induced by Abeta fibrils was prevented by the inhibition of c-Abl with imatinib mesylate (Gleevec or STI571) and by the inhibition c-Abl expression by RNAi. These results directly point to a therapeutic strategy for the treatment of Alzheimer's disease.
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Affiliation(s)
- Alejandra R Alvarez
- FONDAP Center for Cell and Molecular Biology Joaquin V. Luco, P. Universidad Católica de Chile, Santiago, 114-D, Chile.
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Alvarez AR, Godoy JA, Mullendorff K, Olivares GH, Bronfman M, Inestrosa NC. Wnt-3a overcomes β-amyloid toxicity in rat hippocampal neurons. Exp Cell Res 2004; 297:186-96. [PMID: 15194435 DOI: 10.1016/j.yexcr.2004.02.028] [Citation(s) in RCA: 167] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2003] [Revised: 02/10/2004] [Indexed: 10/26/2022]
Abstract
The aim of this study was to evaluate whether the direct activation of the Wnt signaling pathway by its endogenous Wnt-3a ligand prevents the toxic effects induced by amyloid-beta-peptide (Abeta) in rat hippocampal neurons. We report herein that the Wnt-3a ligand was indeed able to overcome toxic effects induced by Abeta in hippocampal neurons, including a neuronal impairment on cell survival, an increase in glycogen synthase kinase-3beta (GSK-3beta) and tau phosphorylation, a decrease in cytoplasmic beta-catenin and a decrease in the expression of the Wnt target gene engrailed-1. We further demonstrate that Wnt-3a protects hippocampal neurons from apoptosis induced by Abeta. Our results support the hypothesis that a loss of function of Wnt signaling may play a role in the progression of neurodegenerative diseases such as Alzheimer's disease.
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Affiliation(s)
- Alejandra R Alvarez
- Centro FONDAP de Regulación Celular y Patología "Joaquín V. Luco", MIFAB, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
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29
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30
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Alvarez AR, Shardonofsky FR. [Severe asthmatic crisis in children]. Bol Med Hosp Infant Mex 1989; 46:251-8. [PMID: 2655654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The aim of the present study was to evaluate clinical and laboratory features of acute severe asthma (ASA) in children and their outcome of mechanical ventilation (MV). Twenty ASA episodes admitted to the hospital with hypercapnia (HC) and/or lost of consciousness (LC) and/or severe non reversible bronchial obstruction (NRBO) were retrospectively studied. Long lasting asthma and frequent admissions were registered in the majority of cases. In HC group (14 cases) the PaCO2 was 70 +/- 26 mmHg (X +/- SD). Hypercapnia was associated with intravenous administration of sodium bicarbonate in three cases. In NRBO group (4 cases) the acute response to salbutamol brought out during the first week of treatment and it was associated with increased basal forced expiratory volume in one second (FEV1). Ten cases were treated with MV because of hypercapnia and/or lost of consciousness, seizures (one case), and cardiac arrest (one case). The later patient died in 24 hours. Pneumothorax and atelectasis (one case), and pneumonia (one case) were the complications of mechanical ventilation. Three cases with PaO2 less than 60 mmHg and four cases with FEV1 less than 60% were sent home. After 27 days one patient from the later group had a new episode of ASA. Arterial gases and expiratory flow measurements are paramount tools for close monitoring of children with ASA. It is suggested that normalization of those parameters are an essential criteria for discharging those patients.
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31
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Miyares SR, Gutierrez Muñiz JA, Alvarez AR. [Disease of the first permanent molar in Cuban children. An epidemiological problem]. Rev Cubana Estomatol 1989; 26:81-6. [PMID: 2639464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The condition of first permanent molars in a cohort of children born in Cuba, during the week comprised from March the 1st. to 7, 1973, is presented now when they are 11 years old. Maxillary teeth presented a better conservation level than mandibular teeth. Non valuable differences were found in the condition of teeth of one or another hemiarch. It was found that 80.9% of the children had one or more molars affected by caries.
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Alvarez AR, Russell MT. Emergency evacuation: removal of the critically ill patient. Focus Crit Care 1987; 14:18-22. [PMID: 3691881] [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: 01/07/2023]
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Shardonofsky FR, Alvarez AR, Grinstein S, Bayley Bustamante G. [Etiologic diagnosis of pleuropulmonary suppurations in children]. Medicina (B Aires) 1979; 39:9-15. [PMID: 316851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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35
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Buys MC, Carrera MA, Guidi EE, Miranda CE, Alvarez AR, Scaro JL. [Erythropoiesis in the mouse following chronic administration of small doses of busulphan (author's transl)]. Rev Esp Fisiol 1977; 33:163-7. [PMID: 897319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
After both splenectomized and non-splenectomized mice had received a total amount of five doses of Busulfan at a rate of 0.14 mg/48 h, the recovery of their erythropoietic organs through the addition of 59Fe was investigated, after the cytostatic treatment had been cut off. In the non-splenectomized animals recovery was clear, keeping high 59Fe uptake values, significantly above normal, throughout the 21 days of the experiment. In the splenectomized mice, 59Fe uptake reached a peak of 38 per cent three days after the supply had been cut off, and from then on it descended to subnormal values.
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Cubo DE, Macri CN, Alvarez AR, Parral H. [Respiratory care in poisoning]. ARCH ARGENT PEDIATR 1971; 69:245-6. [PMID: 5121591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Macri CN, Alvarez AR. [Fibrocystic disease of the pancreas and clinico-functional correlation]. ARCH ARGENT PEDIATR 1971; 69:173-82. [PMID: 5571405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Alvarez AR, Bayley Bustamante G, Parral H. [Evaluation of CO2 partial pressure of exhaled gas and its relation to arterial capillary blood values. Application in the clinical management of respiratory diseases]. ARCH ARGENT PEDIATR 1967; 65:89-93. [PMID: 5607842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Matera FC, Alvarez AR, Badia I, Bugarini H, Landoni JF, Mesz B, Mendilharzu F, Mandilharzu JL, Murad J, Quintana H. [Neuroplegic treatment of poliomyelitis]. Anesth Analg (Paris) 1957; 14:254-9. [PMID: 15445016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
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