1
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Acuña-Castillo C, Vidal M, Vallejos-Vidal E, Luraschi R, Barrera-Avalos C, Inostroza-Molina A, Molina-Cabrera S, Valdes D, Schafer C, Maisey K, Imarai M, Vera R, Vargas S, Rojo LE, Leiva-Salcedo E, Escobar A, Reyes-Cerpa S, Gaete A, Palma-Vejares R, Travisany D, Torres C, Reyes-López FE, Sandino AM. A retrospective study suggests 55 days of persistence of SARS-CoV-2 during the first wave of the pandemic in Santiago de Chile. Heliyon 2024; 10:e24419. [PMID: 38601544 PMCID: PMC11004068 DOI: 10.1016/j.heliyon.2024.e24419] [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: 04/04/2022] [Revised: 12/12/2023] [Accepted: 01/08/2024] [Indexed: 04/12/2024] Open
Abstract
Background As the COVID-19 pandemic persists, infections continue to surge globally. Presently, the most effective strategies to curb the disease and prevent outbreaks involve fostering immunity, promptly identifying positive cases, and ensuring their timely isolation. Notably, there are instances where the SARS-CoV-2 virus remains infectious even after patients have completed their quarantine. Objective Understanding viral persistence post-quarantine is crucial as it could account for localized infection outbreaks. Therefore, studying and documenting such instances is vital for shaping future public health policies. Design This study delves into a unique case of SARS-CoV-2 persistence in a 60-year-old female healthcare worker with a medical history of hypertension and hypothyroidism. The research spans 55 days, marking the duration between her initial and subsequent diagnosis during Chile's first COVID-19 wave, with the analysis conducted using RT-qPCR. Results Genomic sequencing-based phylogenetic analysis revealed that the SARS-CoV-2 detected in both Nasopharyngeal swab samples (NPSs) was consistent with the 20B clade of the Nextstrain classification, even after a 55-day interval. Conclusion This research underscores the need for heightened vigilance concerning cases of viral persistence. Such instances, albeit rare, might be pivotal in understanding sporadic infection outbreaks that occur post-quarantine.
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Affiliation(s)
- Claudio Acuña-Castillo
- Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, Santiago, Chile
- Departamento de Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Mabel Vidal
- Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, Santiago, Chile
- Facultad de Ingeniería, Arquitectura y Diseño, Universidad San Sebastián, Concepción, Chile
| | - Eva Vallejos-Vidal
- Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, Santiago, Chile
- Centro de Nanociencia y Nanotecnología CEDENNA, Universidad de Santiago de Chile, Chile
- Núcleo de Investigaciones Aplicadas en Ciencias Veterinarias y Agronómicas, Facultad de Medicina Veterinaria y Agronomía, Universidad De Las Américas, La Florida, Santiago, Chile
| | - Roberto Luraschi
- Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, Santiago, Chile
| | | | | | | | - Daniel Valdes
- Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, Santiago, Chile
- Departamento de Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Carolina Schafer
- Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, Santiago, Chile
| | - Kevin Maisey
- Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, Santiago, Chile
| | - Mónica Imarai
- Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, Santiago, Chile
- Departamento de Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Rodrigo Vera
- Hospital de Urgencia Asistencia Pública (HUAP), Santiago, Chile
| | - Sergio Vargas
- Hospital de Urgencia Asistencia Pública (HUAP), Santiago, Chile
| | - Leonel E. Rojo
- Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, Santiago, Chile
- Departamento de Biología, Universidad de Santiago de Chile, Santiago, Chile
| | | | - Alejandro Escobar
- Laboratorio Biología Celular y Molecular, Instituto de Investigación en Ciencias Odontológicas, Universidad de Chile, Santiago, Chile
| | - Sebastián Reyes-Cerpa
- Centro de Genómica y Bioinformática, Facultad de Ciencias, Ingeniería y Tecnología, Universidad Mayor, Santiago, Chile
- Escuela de Biotecnología, Facultad de Ciencias, Ingeniería y Tecnología, Universidad Mayor, Santiago, Chile
| | - Alexis Gaete
- Laboratorio de Bioinformática y Expresión Génica, Instituto de Nutrición y Tecnología de Los Alimentos, Universidad de Chile, Santiago, Chile
- Fondap Center for Genome Regulation, Universidad de Chile, Santiago, Chile
| | - Ricardo Palma-Vejares
- Centro de Modelamiento Matemático UMI-CNRS 2807, Universidad de Chile, Santiago, Chile
| | - Dante Travisany
- Fondap Center for Genome Regulation, Universidad de Chile, Santiago, Chile
- Centro de Modelamiento Matemático UMI-CNRS 2807, Universidad de Chile, Santiago, Chile
- Inria Chile Research Center, Santiago, Chile
| | - Claudio Torres
- Department of Neurobiology Drexel University, Philadelphia, United States
| | | | - Ana María Sandino
- Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, Santiago, Chile
- Departamento de Biología, Universidad de Santiago de Chile, Santiago, Chile
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Marileo AM, Gavilán J, San Martín VP, Lara CO, Sazo A, Muñoz-Montesino C, Castro PA, Burgos CF, Leiva-Salcedo E, Aguayo LG, Moraga-Cid G, Fuentealba J, Yévenes GE. Modulation of GABA A receptors and of GABAergic synapses by the natural alkaloid gelsemine. Front Mol Neurosci 2023; 15:1083189. [PMID: 36733271 PMCID: PMC9887029 DOI: 10.3389/fnmol.2022.1083189] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 12/30/2022] [Indexed: 01/18/2023] Open
Abstract
The Gelsemium elegans plant preparations have shown beneficial activity against common diseases, including chronic pain and anxiety. Nevertheless, their clinical uses are limited by their toxicity. Gelsemine, one of the most abundant alkaloids in the Gelsemium plants, have replicated these therapeutic and toxic actions in experimental behavioral models. However, the molecular targets underlying these biological effects remain unclear. The behavioral activity profile of gelsemine suggests the involvement of GABAA receptors (GABAARs), which are the main biological targets of benzodiazepines (BDZs), a group of drugs with anxiolytic, hypnotic, and analgesic properties. Here, we aim to define the modulation of GABAARs by gelsemine, with a special focus on the subtypes involved in the BDZ actions. The gelsemine actions were determined by electrophysiological recordings of recombinant GABAARs expressed in HEK293 cells, and of native receptors in cortical neurons. Gelsemine inhibited the agonist-evoked currents of recombinant and native receptors. The functional inhibition was not associated with the BDZ binding site. We determined in addition that gelsemine diminished the frequency of GABAergic synaptic events, likely through a presynaptic modulation. Our findings establish gelsemine as a negative modulator of GABAARs and of GABAergic synaptic function. These pharmacological features discard direct anxiolytic or analgesic actions of gelsemine through GABAARs but support a role of GABAARs on the alkaloid induced toxicity. On the other hand, the presynaptic effects of the alkaloid provide an additional mechanism to explain their beneficial effects. Collectively, our results contribute novel information to improve understanding of gelsemine actions in the mammalian nervous system.
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Affiliation(s)
- Ana M. Marileo
- Department of Physiology, Faculty of Biological Sciences, Universidad de Concepción, Concepción, Chile,Millennium Nucleus for the Study of Pain (MiNuSPain), Santiago, Chile
| | - Javiera Gavilán
- Department of Physiology, Faculty of Biological Sciences, Universidad de Concepción, Concepción, Chile
| | - Victoria P. San Martín
- Department of Physiology, Faculty of Biological Sciences, Universidad de Concepción, Concepción, Chile,Millennium Nucleus for the Study of Pain (MiNuSPain), Santiago, Chile
| | - Cesar O. Lara
- Department of Physiology, Faculty of Biological Sciences, Universidad de Concepción, Concepción, Chile,Millennium Nucleus for the Study of Pain (MiNuSPain), Santiago, Chile
| | - Anggelo Sazo
- Department of Physiology, Faculty of Biological Sciences, Universidad de Concepción, Concepción, Chile,Millennium Nucleus for the Study of Pain (MiNuSPain), Santiago, Chile
| | - Carola Muñoz-Montesino
- Department of Physiology, Faculty of Biological Sciences, Universidad de Concepción, Concepción, Chile
| | - Patricio A. Castro
- Department of Physiology, Faculty of Biological Sciences, Universidad de Concepción, Concepción, Chile
| | - Carlos F. Burgos
- Department of Physiology, Faculty of Biological Sciences, Universidad de Concepción, Concepción, Chile
| | - Elías Leiva-Salcedo
- Department of Biology, Faculty of Chemistry and Biology, Universidad de Santiago de Chile, Santiago, Chile
| | - Luis G. Aguayo
- Department of Physiology, Faculty of Biological Sciences, Universidad de Concepción, Concepción, Chile
| | - Gustavo Moraga-Cid
- Department of Physiology, Faculty of Biological Sciences, Universidad de Concepción, Concepción, Chile
| | - Jorge Fuentealba
- Department of Physiology, Faculty of Biological Sciences, Universidad de Concepción, Concepción, Chile
| | - Gonzalo E. Yévenes
- Department of Physiology, Faculty of Biological Sciences, Universidad de Concepción, Concepción, Chile,Millennium Nucleus for the Study of Pain (MiNuSPain), Santiago, Chile,*Correspondence: Gonzalo E. Yévenes, ✉
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3
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Acuña-Castillo C, Inostroza-Molina A, Castro SA, Molina-Cabrera S, Leiva-Salcedo E, Riquelme D, Luraschi R, Barrera-Avalos C, Vallejos-Vidal E, Mella-Torres A, Valdés D, Torres C, Maisey K, Escobar A, Reyes-Cerpa S, Toro-Ascuy D, Imarai M, Reyes-López FE, Sandino AM. Comparison of the First and Second Wave of Infections by SARS-CoV-2: A Retrospective and Longitudinal Study From a Primary Health Care Center in Santiago of Chile. Front Public Health 2022; 10:913519. [PMID: 35844873 PMCID: PMC9280347 DOI: 10.3389/fpubh.2022.913519] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 04/05/2022] [Accepted: 05/18/2022] [Indexed: 12/23/2022] Open
Abstract
The current COVID-19 pandemic is caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Many countries have reported the experience of at least two contagion waves, describing associated mortality rates and population behavior. The analysis of the effect of this pandemic in different localities can provide valuable information on the key factors to consider in the face of future massive infectious diseases. This work describes the first retrospective and comparative study about behavior during the first and second waves of the COVID-19 pandemic in Chile from a primary Healthcare Center. From 19,313 real-time quantitative PCR (RT-qPCR) tests assessed, the selected 1,694 positive diagnostics showed a decrease in mortality rate in the second wave (0.6%) compared with the first (4.6%). In addition, we observed that infections in the second wave were mainly in young patients with reduced comorbidities. The population with a complete vaccination schedule shows a decrease in the duration of symptoms related to the disease, and patients with more comorbidities tend to develop severe illness. This report provides evidence to partially understand the behavior and critical factors in the severity of the COVID-19 pandemic in the population of Santiago of Chile.
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Affiliation(s)
- Claudio Acuña-Castillo
- Centro de Biotecnología Acuícola, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | | | - Sergio A. Castro
- Laboratorio de Ecología y Biodiversidad, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | | | - Elías Leiva-Salcedo
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Denise Riquelme
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Roberto Luraschi
- Centro de Biotecnología Acuícola, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Carlos Barrera-Avalos
- Centro de Biotecnología Acuícola, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Eva Vallejos-Vidal
- Centro de Biotecnología Acuícola, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
- Centro de Nanociencia y Nanotecnología CEDENNA, Universidad de Santiago de Chile, Santiago, Chile
- Facultad de Medicina Veterinaria y Agronomía, Universidad de Las Américas, Santiago, Chile
| | - Andrea Mella-Torres
- Centro de Biotecnología Acuícola, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Daniel Valdés
- Centro de Biotecnología Acuícola, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Claudio Torres
- Department of Neurobiology Drexel University, Philadelphia, PA, United States
| | - Kevin Maisey
- Centro de Biotecnología Acuícola, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Alejandro Escobar
- Laboratorio Biología Celular y Molecular, Facultad de Odontología, Instituto de Investigación en Ciencias Odontológicas, Universidad de Chile, Santiago, Chile
| | - Sebastián Reyes-Cerpa
- Centro de Genómica y Bioinformática, Facultad de Ciencias, Universidad Mayor, Santiago, Chile
- Escuela de Biotecnología, Facultad de Ciencias, Universidad Mayor, Santiago, Chile
| | - Daniela Toro-Ascuy
- Laboratorio de Virología, Facultad de Ciencias de la Salud, Instituto de Ciencias Biomedicas, Universidad Autónoma de Chile, Santiago, Chile
| | - Mónica Imarai
- Centro de Biotecnología Acuícola, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Felipe E. Reyes-López
- Centro de Biotecnología Acuícola, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
- Department of Cell Biology, Physiology, and Immunology, Universitat Autònoma de Barcelona, Barcelona, Spain
- *Correspondence: Felipe E. Reyes-López
| | - Ana María Sandino
- Centro de Biotecnología Acuícola, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
- Ana María Sandino
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4
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Barrera-Avalos C, Briceño P, Valdés D, Imarai M, Leiva-Salcedo E, Rojo LE, Milla LA, Huidobro-Toro JP, Robles-Planells C, Escobar A, Di Virgilio F, Morón G, Sauma D, Acuña-Castillo C. P2X7 receptor is essential for cross-dressing of bone marrow-derived dendritic cells. iScience 2021; 24:103520. [PMID: 34950860 PMCID: PMC8671947 DOI: 10.1016/j.isci.2021.103520] [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: 07/01/2021] [Revised: 10/29/2021] [Accepted: 11/23/2021] [Indexed: 11/25/2022] Open
Abstract
T cell activation requires the processing and presentation of antigenic peptides in the context of a major histocompatibility complex (MHC complex). Cross-dressing is a non-conventional antigen presentation mechanism, involving the transfer of preformed peptide/MHC complexes from whole cells, such as apoptotic cells (ACs) to the cell membrane of professional antigen-presenting cells (APCs), such as dendritic cells (DCs). This is an essential mechanism for the induction of immune response against viral antigens, tumors, and graft rejection, which until now has not been clarified. Here we show for first time that the P2X7 receptor (P2X7R) is crucial to induce cross-dressing between ACs and Bone-Marrow DCs (BMDCs). In controlled ex vivo assays, we found that the P2X7R in both ACs and BMDCs is required to induce membrane and fully functional peptide/MHC complex transfer to BMDCs. These findings show that acquisition of ACs-derived preformed antigen/MHC-I complexes by BMDCs requires P2X7R expression. Cross-dressing of antigens to Dendritic Cells (DCs) is dependent of P2X7 receptor The P2X7 receptor must be present in both Dendritic Cells and antigen source The transfer of antigen/MHC-I complexes to DCs is functional and activates T CD8 cells The P2X7 receptor allows Cross-Dressing possibly through a membrane fusion process
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Affiliation(s)
- Carlos Barrera-Avalos
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda, Santiago 3363, Chile
- Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, USACH, Alameda 3363 Santiago, Chile
| | - Pedro Briceño
- Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Daniel Valdés
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda, Santiago 3363, Chile
| | - Mónica Imarai
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda, Santiago 3363, Chile
- Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, USACH, Alameda 3363 Santiago, Chile
| | - Elías Leiva-Salcedo
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda, Santiago 3363, Chile
| | - Leonel E. Rojo
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda, Santiago 3363, Chile
- Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, USACH, Alameda 3363 Santiago, Chile
| | - Luis A. Milla
- Centro de Investigaciones Biomédicas y Aplicadas, Escuela de Medicina, Facultad de Ciencias Médicas, Universidad de Santiago de Chile, Chile
| | - Juan Pablo Huidobro-Toro
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda, Santiago 3363, Chile
| | - Claudia Robles-Planells
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda, Santiago 3363, Chile
- Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, USACH, Alameda 3363 Santiago, Chile
| | - Alejandro Escobar
- Laboratorio Biología Celular y Molecular, Instituto de Investigación en Ciencias Odontológicas, Facultad de Odontología, Universidad de Chile, Santiago, Chile
| | | | - Gabriel Morón
- Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas, Centro de Investigaciones en Bioquímica Clínica e Inmunología, Córdoba, Argentina
| | - Daniela Sauma
- Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
- Corresponding author
| | - Claudio Acuña-Castillo
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda, Santiago 3363, Chile
- Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, USACH, Alameda 3363 Santiago, Chile
- Corresponding author
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5
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Barrera-Avalos C, Mena J, López X, Cappelli C, Neira T, Imarai M, Fernández R, Robles-Planells C, Rojo LE, Milla LA, Leiva-Salcedo E, Escobar A, Acuña-Castillo C. Adenosine triphosphate, polymyxin B and B16 cell-derived immunization induce anticancer response. Immunotherapy 2021; 13:309-326. [PMID: 33397152 DOI: 10.2217/imt-2020-0209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 12/17/2022] Open
Abstract
Aim: Whole dead tumor cells can be used as antigen source and the induction of protective immune response could be enhanced by damage-associated molecular patterns. Materials & methods: We generated whole dead tumor cells called B16-immunogenic cell bodies (ICBs) from B16 melanoma cells by nutrient starvation and evaluated the in vivo antitumor effect of B16-ICBs plus ATP and polymyxin B (PMB). Results: The subcutaneous immunization with B16-ICBs + PMB + ATP a 50% of tumor-free animals and induced a significant delay in tumor growth in a prophylactic approach. These results correlated with maturation of bone marrow-derived dendritic cells and activation of T CD8+ lymphocytes in vitro. Conclusion: Altogether, ICB + ATP + PMB is efficient in inducing the antitumor efficacy of the whole dead tumor cells vaccine.
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Affiliation(s)
- Carlos Barrera-Avalos
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda 3363, Santiago, Chile.,Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, USACH, Alameda 3363, Santiago, Chile
| | - Javier Mena
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda 3363, Santiago, Chile
| | - Ximena López
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda 3363, Santiago, Chile
| | - Claudio Cappelli
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda 3363, Santiago, Chile.,Laboratorio de Patología Molecular, Instituto de Bioquimica y Microbiologia, Universidad Austral de Chile, Valdivia, Chile
| | - Tanya Neira
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda 3363, Santiago, Chile
| | - Mónica Imarai
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda 3363, Santiago, Chile.,Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, USACH, Alameda 3363, Santiago, Chile
| | | | - Claudia Robles-Planells
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda 3363, Santiago, Chile.,Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, USACH, Alameda 3363, Santiago, Chile
| | - Leonel E Rojo
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda 3363, Santiago, Chile.,Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, USACH, Alameda 3363, Santiago, Chile
| | - Luis A Milla
- Centro de Investigaciones Biomédicas y Aplicadas, Escuela de Medicina, Facultad de Ciencias Médicas, Universidad de Santiago de Chile, Santiago, Chile
| | - Elías Leiva-Salcedo
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda 3363, Santiago, Chile
| | - Alejandro Escobar
- Instituto de Investigación en Ciencias Odontológicas, Facultad de Odontología, Universidad de Chile, Santiago, Chile
| | - Claudio Acuña-Castillo
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Alameda 3363, Santiago, Chile.,Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, USACH, Alameda 3363, Santiago, Chile
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6
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Robles-Planells C, Michelson SA, Mena J, Escrig D, Rojas JL, Sanchez-Guerrero G, Hernández R, Barrera-Avalos C, Rojo LE, Sauma D, Kalergis AM, Imarai M, Fernández R, Robles CA, Leiva-Salcedo E, Santander R, Escobar A, Acuña-Castillo C. Lithraea caustic (Litre) Extract Promotes an Antitumor Response Against B16 Melanoma. Front Pharmacol 2019; 10:1201. [PMID: 31695610 PMCID: PMC6817581 DOI: 10.3389/fphar.2019.01201] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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: 12/27/2018] [Accepted: 09/17/2019] [Indexed: 11/17/2022] Open
Abstract
Melanoma immunotherapy, specifically the autotransplant of dendritic cells charged with tumors antigens, has shown promising results in clinical trials. The positive clinical effects of this therapy have been associated to increased Th17 response and delayed-type hypersensitivity (DTH) against to tumor antigens. Some synthetic compounds, such as diphenylcyclopropenone (DPCP), are capable of triggering a DTH response in cutaneous malignancies and also to induce clinically relevant effects against melanoma. In this work, we evaluated Litre extract (LExT), a standardized extract of a Chilean stinging plant, Lithraea caustic (Litre). As Litre plant is known to induce DTH, we used a murine B16 melanoma model to compare the topical and intratumor efficacy of LExT with synthetic DTH inducers (DPCP and 2,4-dinitrochlorobenzene [DNCB]). LExt contained mainly long chain catechols and sesquiterpenes. The intratumor injection of LExT induced a significant delay in tumor growth, similarly topical treatment of an established tumor with 0.1% LExT ointment induced a growth delay and even tumor regression in 15% of treated animals. No significant changes were observed on the T-cell populations associated to LExT treatment, and neither DNCB nor DPCP were capable to induce none of the LExT-induced antitumoral effects. Interestingly, our results indicate that LExT induces an antitumor response against melanoma in a mouse model and could bring a new –and affordable- treatment for melanoma in humans.
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Affiliation(s)
- Claudia Robles-Planells
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile.,Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, Santiago, Chile
| | - Sofia A Michelson
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Javier Mena
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Daniela Escrig
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Juan L Rojas
- Escuela de Medicina, Facultad de Ciencias Médicas, Universidad de Santiago de Chile, Santiago, Chile
| | - Giselle Sanchez-Guerrero
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Ronny Hernández
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Carlos Barrera-Avalos
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile.,Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, Santiago, Chile
| | - Leonel E Rojo
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile.,Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, Santiago, Chile
| | - Daniela Sauma
- Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Alexis M Kalergis
- Millennium Institute Immunology and Immunotherapy, FOCIS Center of Excellence, Facultad de Ciencias Biológicas, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Mónica Imarai
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile.,Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, Santiago, Chile
| | | | - Carolina A Robles
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Elías Leiva-Salcedo
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Rocio Santander
- Departamento de Ciencias del Ambiente, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Alejandro Escobar
- Laboratorio Biología Celular y Molecular, Instituto de Investigación en Ciencias Odontológicas, Facultad de Odontología, Universidad de Chile, Santiago, Chile
| | - Claudio Acuña-Castillo
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile.,Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, Santiago, Chile
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7
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Leiva-Salcedo E, Riquelme D, Cerda O, Stutzin A. TRPM4 activation by chemically- and oxygen deprivation-induced ischemia and reperfusion triggers neuronal death. Channels (Austin) 2017; 11:624-635. [PMID: 28876976 DOI: 10.1080/19336950.2017.1375072] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Cerebral ischemia-reperfusion injury triggers a deleterious process ending in neuronal death. This process has two components, a glutamate-dependent and a glutamate-independent mechanism. In the glutamate-independent mechanism, neurons undergo a slow depolarization eventually leading to neuronal death. However, little is known about the molecules that take part in this process. Here we show by using mice cortical neurons in culture and ischemia-reperfusion protocols that TRPM4 is fundamental for the glutamate-independent neuronal damage. Thus, by blocking excitotoxicity, we reveal a slow activating, glibenclamide- and 9-phenanthrol-sensitive current, which is activated within 5 min upon ischemia-reperfusion onset. TRPM4 shRNA-based silenced neurons show a reduced ischemia-reperfusion induced current and depolarization. Neurons were protected from neuronal death up to 3 hours after the ischemia-reperfusion challenge. The activation of TRPM4 during ischemia-reperfusion injury involves the increase in both, intracellular calcium and H2O2, which may act together to produce a sustained activation of the channel.
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Affiliation(s)
- Elías Leiva-Salcedo
- a Departamento de Biología , Facultad de Química y Biología, Universidad de Santiago de Chile , Santiago , Chile
| | - Denise Riquelme
- a Departamento de Biología , Facultad de Química y Biología, Universidad de Santiago de Chile , Santiago , Chile
| | - Oscar Cerda
- b Programa de Biología Celular y Molecular , Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile , Santiago , Chile.,c Millennium Nucleus of Ion Channels-Associated Diseases (MiNICAD) , Universidad de Chile , Santiago , Chile
| | - Andrés Stutzin
- d Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile , Santiago , Chile
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8
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Cáceres M, Ortiz L, Recabarren T, Romero A, Colombo A, Leiva-Salcedo E, Varela D, Rivas J, Silva I, Morales D, Campusano C, Almarza O, Simon F, Toledo H, Park KS, Trimmer JS, Cerda O. TRPM4 Is a Novel Component of the Adhesome Required for Focal Adhesion Disassembly, Migration and Contractility. PLoS One 2015; 10:e0130540. [PMID: 26110647 PMCID: PMC4482413 DOI: 10.1371/journal.pone.0130540] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 05/21/2015] [Indexed: 11/18/2022] Open
Abstract
Cellular migration and contractility are fundamental processes that are regulated by a variety of concerted mechanisms such as cytoskeleton rearrangements, focal adhesion turnover, and Ca2+ oscillations. TRPM4 is a Ca2+-activated non-selective cationic channel (Ca2+-NSCC) that conducts monovalent but not divalent cations. Here, we used a mass spectrometry-based proteomics approach to identify putative TRPM4-associated proteins. Interestingly, the largest group of these proteins has actin cytoskeleton-related functions, and among these nine are specifically annotated as focal adhesion-related proteins. Consistent with these results, we found that TRPM4 localizes to focal adhesions in cells from different cellular lineages. We show that suppression of TRPM4 in MEFs impacts turnover of focal adhesions, serum-induced Ca2+ influx, focal adhesion kinase (FAK) and Rac activities, and results in reduced cellular spreading, migration and contractile behavior. Finally, we demonstrate that the inhibition of TRPM4 activity alters cellular contractility in vivo, affecting cutaneous wound healing. Together, these findings provide the first evidence, to our knowledge, for a TRP channel specifically localized to focal adhesions, where it performs a central role in modulating cellular migration and contractility.
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Affiliation(s)
- Mónica Cáceres
- Programa de Biología Celular y Molecular, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile
- Department of Neurobiology, Physiology and Behavior, College of Biological Sciences, University of California Davis, Davis, California, United States of America
| | - Liliana Ortiz
- Programa de Biología Celular y Molecular, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Tatiana Recabarren
- Programa de Biología Celular y Molecular, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile
- Programa de Anatomía y Biología del Desarrollo, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Anibal Romero
- Programa de Biología Celular y Molecular, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Alicia Colombo
- Programa de Anatomía y Biología del Desarrollo, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Elías Leiva-Salcedo
- Section on Cellular Signaling, Program in Developmental Biology, National Institute of Child Health and Human Development (NICHD), National Institute of Health, Bethesda, Maryland, United States of America
| | - Diego Varela
- Programa de Fisiopatología, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - José Rivas
- Programa de Biología Celular y Molecular, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Ian Silva
- Programa de Biología Celular y Molecular, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Diego Morales
- Programa de Biología Celular y Molecular, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Camilo Campusano
- Programa de Biología Celular y Molecular, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Oscar Almarza
- Programa de Biología Celular y Molecular, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Felipe Simon
- Departamento de Ciencias Biologicas, Facultad de Ciencias Biologicas, Universidad Andres Bello, Santiago, Chile
- Facultad de Medicina, Universidad Andres Bello, Santiago, Chile
- Millennium Institute on Immunology and Immunotherapy, Santiago, Chile
| | - Hector Toledo
- Programa de Biología Celular y Molecular, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Kang-Sik Park
- Department of Neurobiology, Physiology and Behavior, College of Biological Sciences, University of California Davis, Davis, California, United States of America
- Department of Physiology, School of Medicine, Kyung Hee University, Seoul, Korea
| | - James S. Trimmer
- Department of Neurobiology, Physiology and Behavior, College of Biological Sciences, University of California Davis, Davis, California, United States of America
- Department of Physiology and Membrane Biology, School of Medicine, University of California Davis, Davis, California, United States of America
| | - Oscar Cerda
- Programa de Biología Celular y Molecular, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago, Chile
- Department of Neurobiology, Physiology and Behavior, College of Biological Sciences, University of California Davis, Davis, California, United States of America
- * E-mail:
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9
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Cerda O, Cáceres M, Park KS, Leiva-Salcedo E, Romero A, Varela D, Trimmer JS, Stutzin A. Casein kinase-mediated phosphorylation of serine 839 is necessary for basolateral localization of the Ca²⁺-activated non-selective cation channel TRPM4. Pflugers Arch 2014; 467:1723-1732. [PMID: 25231975 DOI: 10.1007/s00424-014-1610-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Revised: 09/03/2014] [Accepted: 09/05/2014] [Indexed: 10/24/2022]
Abstract
Transient receptor potential melastatin-like 4 (TRPM4) is a Ca(2+)-activated non-selective cation channel expressed in a wide range of human tissues. TRPM4 participates in a variety of physiological processes such as T cell activation, myogenic vasoconstriction, and allergic reactions. TRPM4 Ca(2+) sensitivity is enhanced by calmodulin (CaM) and phosphathydilinositol 4, 5-bisphosphate (PI(4,5)P2) binding, as well as, under certain conditions, PKC activation. However, information as to the mechanisms of modulation of this channel remains unknown, including direct identification of phosphorylation sites on TRPM4 and their role in channel features. Here, we use mass-spectrometric-based proteomic approaches (immunoprecipitation and tandem mass spectrometry) to unambiguously identify S839 as a phosphorylation site present on human TRPM4 expressed in a human cell line. Site-directed mutagenesis employing a serine to alanine mutation to eliminate phosphorylation, and a phospho-mimetic aspartate mutation, as well as biochemical and immunocytochemical experiments, revealed a role for S839 phosphorylation in the basolateral expression of TRPM4 channels in epithelial cells. Moreover, we demonstrated that casein kinase 1 (CK1) phosphorylates S839 and is responsible for the basolateral localization of TRPM4.
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Affiliation(s)
- Oscar Cerda
- Programa de Biología Celular y Molecular, Facultad de Medicina, ICBM, Universidad de Chile, Santiago, Chile.,Centro de Estudios Moleculares de la Célula (CEMC), Facultad de Medicina, Universidad de Chile, Santiago, Chile.,Department of Neurobiology, Physiology and Behavior, College of Biological Sciences, University of California, Davis CA 95616, USA
| | - Mónica Cáceres
- Programa de Biología Celular y Molecular, Facultad de Medicina, ICBM, Universidad de Chile, Santiago, Chile.,Department of Neurobiology, Physiology and Behavior, College of Biological Sciences, University of California, Davis CA 95616, USA
| | - Kang-Sik Park
- Department of Neurobiology, Physiology and Behavior, College of Biological Sciences, University of California, Davis CA 95616, USA.,Department of Physiology, Kyung Hee University School of Medicine, Seoul, South Korea 130-701
| | - Elías Leiva-Salcedo
- Centro de Estudios Moleculares de la Célula (CEMC), Facultad de Medicina, Universidad de Chile, Santiago, Chile.,Programa de Fisiopatología, Facultad de Medicina, ICBM, Universidad de Chile, Santiago, Chile
| | - Aníbal Romero
- Programa de Biología Celular y Molecular, Facultad de Medicina, ICBM, Universidad de Chile, Santiago, Chile
| | - Diego Varela
- Centro de Estudios Moleculares de la Célula (CEMC), Facultad de Medicina, Universidad de Chile, Santiago, Chile.,Programa de Fisiopatología, Facultad de Medicina, ICBM, Universidad de Chile, Santiago, Chile
| | - James S Trimmer
- Department of Neurobiology, Physiology and Behavior, College of Biological Sciences, University of California, Davis CA 95616, USA.,Department of Physiology and Membrane Biology, School of Medicine, University of California, Davis CA 95616, USA
| | - Andrés Stutzin
- Centro de Estudios Moleculares de la Célula (CEMC), Facultad de Medicina, Universidad de Chile, Santiago, Chile.,Programa de Fisiopatología, Facultad de Medicina, ICBM, Universidad de Chile, Santiago, Chile
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10
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Stojilkovic SS, Leiva-Salcedo E, Rokic MB, Coddou C. Regulation of ATP-gated P2X channels: from redox signaling to interactions with other proteins. Antioxid Redox Signal 2014; 21:953-70. [PMID: 23944253 PMCID: PMC4116155 DOI: 10.1089/ars.2013.5549] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [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: 12/12/2022]
Abstract
SIGNIFICANCE The family of purinergic P2X receptors (P2XRs) is a part of ligand-gated superfamily of channels activated by extracellular adenosine-5'-triphosphate. P2XRs are present in virtually all mammalian tissues as well as in tissues of other vertebrate and nonvertebrate species and mediate a large variety of functions, including fast transmission at central synapses, contraction of smooth muscle cells, platelet aggregation, and macrophage activation to proliferation and cell death. RECENT ADVANCES The recent solving of crystal structure of the zebrafish P2X4.1R is a major advance in the understanding of structural correlates of channel activation and regulation. Combined with growing information obtained in the post-structure era and the reinterpretation of previous work within the context of the tridimensional structure, these data provide a better understanding of how the channel operates at the molecular levels. CRITICAL ISSUES This review focuses on the relationship between redox signaling and P2XR function. We also discuss other allosteric modulation of P2XR gating in the physiological/pathophysiological context. This includes the summary of extracellular actions of trace metals, which can be released to the synaptic cleft, pH decrease that happens during ischemia and inflammation, and calcium, an extracellular and intracellular messenger. FUTURE DIRECTIONS Our evolving understanding of activation and regulation of P2XRs is helpful in clarifying the mechanism by which these channels trigger and modulate cellular functions. Further research is required to identify the signaling pathways contributing to the regulation of the receptor activity and to develop novel and receptor-specific allosteric modulators, which could be used in vivo with therapeutic potential.
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Affiliation(s)
- Stanko S Stojilkovic
- 1 Section on Cellular Signaling, Program in Developmental Neuroscience, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health , Bethesda, Maryland
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11
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Simon F, Leiva-Salcedo E, Armisén R, Riveros A, Cerda O, Varela D, Eguiguren AL, Olivero P, Stutzin A. Hydrogen peroxide removes TRPM4 current desensitization conferring increased vulnerability to necrotic cell death. J Biol Chem 2010; 285:37150-8. [PMID: 20884614 DOI: 10.1074/jbc.m110.155390] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Necrosis is associated with an increase in plasma membrane permeability, cell swelling, and loss of membrane integrity with subsequent release of cytoplasmic constituents. Severe redox imbalance by overproduction of reactive oxygen species is one of the main causes of necrosis. Here we demonstrate that H(2)O(2) induces a sustained activity of TRPM4, a Ca(2+)-activated, Ca(2+)-impermeant nonselective cation channel resulting in an increased vulnerability to cell death. In HEK 293 cells overexpressing TRPM4, H(2)O(2) was found to eliminate in a dose-dependent manner TRPM4 desensitization. Site-directed mutagenesis experiments revealed that the Cys(1093) residue is crucial for the H(2)O(2)-mediated loss of desensitization. In HeLa cells, which endogenously express TRPM4, H(2)O(2) elicited necrosis as well as apoptosis. H(2)O(2)-mediated necrosis but not apoptosis was abolished by replacement of external Na(+) ions with sucrose or the non-permeant cation N-methyl-d-glucamine and by knocking down TRPM4 with a shRNA directed against TRPM4. Conversely, transient overexpression of TRPM4 in HeLa cells in which TRPM4 was previously silenced re-established vulnerability to H(2)O(2)-induced necrotic cell death. In addition, HeLa cells exposed to H(2)O(2) displayed an irreversible loss of membrane potential, which was prevented by TRPM4 knockdown.
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Affiliation(s)
- Felipe Simon
- Centro de Estudios Moleculares de la Célula and Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Av Independencia 1027, Independencia 838-0543, Santiago, Chile
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12
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Varela D, Penna A, Simon F, Eguiguren AL, Leiva-Salcedo E, Cerda O, Sala F, Stutzin A. P2X4 activation modulates volume-sensitive outwardly rectifying chloride channels in rat hepatoma cells. J Biol Chem 2010; 285:7566-74. [PMID: 20056605 PMCID: PMC2844204 DOI: 10.1074/jbc.m109.063693] [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] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2009] [Revised: 12/30/2009] [Indexed: 11/06/2022] Open
Abstract
Volume-sensitive outwardly rectifying (VSOR) Cl(-) channels are critical for the regulatory volume decrease (RVD) response triggered upon cell swelling. Recent evidence indicates that H(2)O(2) plays an essential role in the activation of these channels and that H(2)O(2) per se activates the channels under isotonic isovolumic conditions. However, a significant difference in the time course for current onset between H(2)O(2)-induced and hypotonicity-mediated VSOR Cl(-) activation is observed. In several cell types, cell swelling induced by hypotonic challenges triggers the release of ATP to the extracellular medium, which in turn, activates purinergic receptors and modulates cell volume regulation. In this study, we have addressed the effect of purinergic receptor activation on H(2)O(2)-induced and hypotonicity-mediated VSOR Cl(-) current activation. Here we show that rat hepatoma cells (HTC) exposed to a 33% hypotonic solution responded by rapidly activating VSOR Cl(-) current and releasing ATP to the extracellular medium. In contrast, cells exposed to 200 microm H(2)O(2) VSOR Cl(-) current onset was significantly slower, and ATP release was not detected. In cells exposed to either 11% hypotonicity or 200 microm H(2)O(2), exogenous addition of ATP in the presence of extracellular Ca(2+) resulted in a decrease in the half-time for VSOR Cl(-) current onset. Conversely, in cells that overexpress a dominant-negative mutant of the ionotropic receptor P2X4 challenged with a 33% hypotonic solution, the half-time for VSOR Cl(-) current onset was significantly slowed down. Our results indicate that, at high hypotonic imbalances, swelling-induced ATP release activates the purinergic receptor P2X4, which in turn modulates the time course of VSOR Cl(-) current onset in a extracellular Ca(2+)-dependent manner.
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Affiliation(s)
- Diego Varela
- Centro de Estudios Moleculares de la Célula & Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, 838-0453 Santiago, Chile.
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13
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Gomez CR, Acuña-Castillo C, Pérez C, Leiva-Salcedo E, Riquelme DM, Ordenes G, Oshima K, Aravena M, Pérez VI, Nishimura S, Sabaj V, Walter R, Sierra F. Diminished acute phase response and increased hepatic inflammation of aged rats in response to intraperitoneal injection of lipopolysaccharide. J Gerontol A Biol Sci Med Sci 2009; 63:1299-306. [PMID: 19126842 DOI: 10.1093/gerona/63.12.1299] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Aging is associated with a deterioration of the acute phase response to inflammatory challenges. However, the nature of these defects remains poorly defined. We analyzed the hepatic inflammatory response after intraperitoneal administration of lipopolysaccharide (LPS) given to Fisher 344 rats aged 6, 15, and 22-23 months. Induction of the acute phase proteins (APPs), haptoglobin, alpha-1-acid glycoprotein, and T-kininogen was reduced and/or retarded with aging. Initial induction of interleukin-6 in aged rats was normal, but the later response was increased relative to younger counterparts. An exacerbated hepatic injury was observed in aged rats receiving LPS, as evidenced by the presence of multiple microabscesses in portal tracts, confluent necrosis, higher neutrophil accumulation, and elevated serum levels of alanine aminotransferase, relative to younger animals. Our results suggest that aged rats displayed a reduced expression of APPs and increased hepatic injury in response to the inflammatory insult.
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14
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Olivero P, Leiva-Salcedo E, Devoto L, Stutzin A. Activation of Cl- channels by human chorionic gonadotropin in luteinized granulosa cells of the human ovary modulates progesterone biosynthesis. Endocrinology 2008; 149:4680-7. [PMID: 18499752 DOI: 10.1210/en.2008-0303] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [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] [Indexed: 11/19/2022]
Abstract
Chloride permeability pathways and progesterone (P4) secretion elicited by human chorionic gonadotropin (hCG) in human granulosa cells were studied by electrophysiological techniques and single-cell volume, membrane potential and Ca2+i measurements. Reduction in extracellular Cl(-) and equimolar substitution by the membrane-impermeant anions glutamate or gluconate significantly increased hCG-stimulated P4 accumulation. A similar result was achieved by exposing the cells to hCG in the presence of a hypotonic extracellular solution. Conversely, P4 accumulation was drastically reduced in cells challenged with hCG exposed to a hypertonic solution. Furthermore, conventional Cl(-) channel inhibitors abolished hCG-mediated P4 secretion. In contrast, 25-hydroxycholesterol-mediated P4 accumulation was unaffected by Cl(-) channel blockers. In human granulosa cells, hCG triggered the activation of a tamoxifen-sensitive outwardly rectifying Cl(-) current comparable to the volume-sensitive outwardly rectifying Cl(-) current. Exposure of human granulosa cells to hCG induced a rapid 4,4'-diisothiocyanatostilbene-2,2-disulphonic acid-sensitive cell membrane depolarization that was paralleled with an approximately 20% decrease in cell volume. Treatment with hCG evoked oscillatory and nonoscillatory intracellular Ca2+ signals in human granulosa cells. Extracellular Ca2+ removal and 4,4'-diisothiocyanatostilbene-2,2-disulphonic acid abolished the nonoscillatory component while leaving the Ca2+ oscillations unaffected. It is concluded that human granulosa cells express functional the volume-sensitive outwardly rectifying Cl(-) channels that are activated by hCG, which are critical for plasma membrane potential changes, Ca2+ influx, and P4 production.
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Affiliation(s)
- Pablo Olivero
- Centro de Estudios Moleculares de la Célula and Instituto de Ciencias Biomédicas, Escuela de Medicina, Universidad de Valparaíso, Valparaíso, Chile
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15
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Varela D, Simon F, Olivero P, Armisén R, Leiva-Salcedo E, Jørgensen F, Sala F, Stutzin A. Activation of H 2O 2-Induced VSOR Cl - Currents in HTC Cells Require Phospholipase Cγ1 Phosphorylation and Ca 2+ Mobilisation. Cell Physiol Biochem 2007; 20:773-80. [DOI: 10.1159/000110437] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/09/2007] [Indexed: 11/19/2022] Open
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16
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Pérez V, Leiva-Salcedo E, Acuña-Castillo C, Aravena M, Gómez C, Sabaj V, Colombo A, Nishimura S, Pérez C, Walter R, Sierra F. T-kininogen induces endothelial cell proliferation. Mech Ageing Dev 2006; 127:282-9. [PMID: 16378635 DOI: 10.1016/j.mad.2005.11.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2005] [Revised: 11/14/2005] [Accepted: 11/18/2005] [Indexed: 10/25/2022]
Abstract
Basal proliferation of endothelial cells increases with age, and this might play a role in the etiology of age-related vascular diseases, as well as angiogenesis. Serum kininogen levels increase during aging in rats and humans, and T-kininogen (T-KG) can affect proliferative homeostasis in several cell models. Both kinins and kininogens have been shown previously to be angiogenic through activation of endothelial cell proliferation, and here we show that exposure of endothelial cells to T-KG results in vigorous cell proliferation, accompanied by ERK/AKT activation. In our experiments, the proliferative response requires B1 and B2 kinin receptors, even though kinins are not released from the precursor. We hypothesize that the age-related increase in T-KG could play a significant role in the age-related dysregulation of vascular physiology and function.
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Affiliation(s)
- Viviana Pérez
- Instituto de Ciencias Biomédicas, Programa de Biología Celular y Molecular and Centro FONDAP de Estudios Moleculares de la Célula, Facultad de Medicina, Universidad de Chile, Independencia 1027, Santiago, Chile
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17
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Acuña-Castillo C, Aravena M, Leiva-Salcedo E, Pérez V, Gómez C, Sabaj V, Nishimura S, Pérez C, Colombo A, Walter R, Sierra F. T-kininogen, a cystatin-like molecule, inhibits ERK-dependent lymphocyte proliferation. Mech Ageing Dev 2005; 126:1284-91. [PMID: 16140359 DOI: 10.1016/j.mad.2005.07.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2005] [Revised: 07/26/2005] [Accepted: 07/26/2005] [Indexed: 10/25/2022]
Abstract
Plasma levels of kininogens increase with age in both rats and humans. Kininogens are inhibitors of cysteine proteinases, and filarial cysteine proteinase inhibitors (cystatins) reduce the proliferation of T cells. We evaluated whether T-kininogen (T-KG) might mimic this effect, and here we present data indicating that exposure of either rat splenocytes or Jurkat cells to purified T-KG results in inhibition of both ERK activation and [(3)H]-thymidine incorporation, both basal and in response to ConA or PHA. Interestingly, T-KG did not impair [(3)H]-thymidine incorporation in response to IL-2, which requires primarily the activation of the JNK and Jak/STAT pathways. These effects were neither the consequence of increased cell death, nor required the activity of kinin receptors. Furthermore, when T cell receptor proximal events were bypassed by the use of PMA plus Calcium ionophore, T-KG no longer inhibited ERK activation, suggesting that inhibition occurs upstream of these events, possibly at the level of membrane associated signal transduction molecules. We conclude that, like filarial cystatins, T-KG inhibits ERK-dependent T cell proliferation, and these observations suggest a possible role for T-KG in immunosenescence.
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Affiliation(s)
- Claudio Acuña-Castillo
- Instituto de Ciencias Biomédicas, Programa de Biología Celular y Molecular, Facultad de Medicina, Universidad de Chile, Independencia 1027, Santiago, Chile
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Aravena M, Pérez C, Pérez V, Acuña-Castillo C, Gómez C, Leiva-Salcedo E, Nishimura S, Sabaj V, Walter R, Sierra F. T-kininogen can either induce or inhibit proliferation in Balb/c 3T3 fibroblasts, depending on the route of administration. Mech Ageing Dev 2005; 126:399-406. [PMID: 15664626 DOI: 10.1016/j.mad.2004.09.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2004] [Revised: 08/27/2004] [Accepted: 09/14/2004] [Indexed: 10/26/2022]
Abstract
T-kininogen (T-KG) is a precursor of T-kinin, the most abundant kinin in rat serum, and also acts as a strong and specific cysteine proteinase inhibitor. Its expression is strongly induced during aging in rats, and expression of T-KG in Balb/c 3T3 fibroblasts results in inhibition of cell proliferation. However, T-KG is a serum protein produced primarily in the liver, and thus, most cells are only exposed to the protein from the outside. To test the effect of T-KG on fibroblasts exposed to exogenous T-KG, we purified the protein from the serum of K-kininogen-deficient Katholiek rats. In contrast to the results obtained by transfection, exposure of Balb/c 3T3 fibroblasts to exogenously added T-KG leads to a dose-dependent increase in [3H]-thymidine incorporation. This response does not require kinin receptors, but it is clearly mediated by activation of the ERK pathway. As a control, we repeated the transfection experiments, using a different promoter. The results are consistent with our published data showing that, under these circumstances, T-KG inhibits cell proliferation. We conclude that T-KG exerts opposite effects on fibroblast proliferation, depending exclusively on the way that it is administered to the cells (transfection versus exogenous addition).
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Affiliation(s)
- M Aravena
- Programa de Biología Celular y Molecular, Facultad de Medicina, Instituto de Ciencias Biomédicas, Universidad de Chile, Independencia 1027, Santiago, Chile
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