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Shukla S, Currim F, Singh J, Goyani S, Saranga MV, Shinde A, Mane M, Chandak N, Kishore S, Singh R. hsa-miR-320a mediated exosome release under PD stress conditions rescue mitochondrial ROS and cell death in the recipient neuronal and glial cells. Int J Biochem Cell Biol 2023; 162:106439. [PMID: 37429353 DOI: 10.1016/j.biocel.2023.106439] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 06/10/2023] [Accepted: 06/14/2023] [Indexed: 07/12/2023]
Abstract
Parkinson's disease (PD) is a progressive neurodegenerative disorder characterized by dopaminergic neuronal cell death. Emerging evidence suggest exosomes as a crucial player in the progression and pathogenesis of PD via intercellular communication between different cell types in brain. Exosome release is enhanced from dysfunctional neurons/glia (source cells) under PD stress and mediates the transfer of biomolecules between different cell types (recipient) in brain leading to unique functional outcomes. Exosome release is modulated by alterations in the autophagy and lysosomal pathways; however, the molecular factors regulating these pathways remain elusive. Micro-RNAs (miRNAs) are class of non-coding RNAs that regulate gene expression post-transcriptionally by binding target mRNA and modulate its turnover and translation; however their role in modulating exosome release is not understood. Here, we analyzed the miRNAs-mRNAs network which target cellular processes regulating exosome release. hsa-miR-320a showed the maximum mRNA targets of autophagy, lysosome, mitochondria and exosome release pathways. hsa-miR-320a regulate ATG5 levels and modulate exosome release under PD stress conditions in neuronal SH-SY5Y and glial U-87 MG cells. hsa-miR-320a modulates autophagic flux, lysosomal functions, and mitochondrial ROS in neuronal SH-SY5Y and glial U-87 MG cells. Exosomes derived from hsa-miR-320a expressing source cells under PD stress conditions were actively internalized in the recipient cells and rescued cell death and mitochondrial ROS. These results suggest that hsa-miR-320a regulates autophagy and lysosomal pathways and modulates exosome release in the source cells and derived exosomes under PD stress conditions rescue cell death and mitochondrial ROS in the recipient neuronal and glial cells.
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Affiliation(s)
- Shatakshi Shukla
- Department of Biochemistry, Faculty of Science, The M.S. University of Baroda, Vadodara 390002, Gujarat, India
| | - Fatema Currim
- Department of Biochemistry, Faculty of Science, The M.S. University of Baroda, Vadodara 390002, Gujarat, India
| | - Jyoti Singh
- Department of Biochemistry, Faculty of Science, The M.S. University of Baroda, Vadodara 390002, Gujarat, India
| | - Shanikumar Goyani
- Department of Biochemistry, Faculty of Science, The M.S. University of Baroda, Vadodara 390002, Gujarat, India
| | - M V Saranga
- Department of Biochemistry, Faculty of Science, The M.S. University of Baroda, Vadodara 390002, Gujarat, India
| | - Anjali Shinde
- Department of Biochemistry, Faculty of Science, The M.S. University of Baroda, Vadodara 390002, Gujarat, India
| | - Minal Mane
- Department of Biochemistry, Faculty of Science, The M.S. University of Baroda, Vadodara 390002, Gujarat, India
| | - Nisha Chandak
- Department of Biochemistry, Faculty of Science, The M.S. University of Baroda, Vadodara 390002, Gujarat, India
| | - Shyam Kishore
- Department of Molecular and Human Genetics, Institute of Science, Banaras Hindu University, Varanasi UP 221005, India
| | - Rajesh Singh
- Department of Biochemistry, Faculty of Science, The M.S. University of Baroda, Vadodara 390002, Gujarat, India; Department of Molecular and Human Genetics, Institute of Science, Banaras Hindu University, Varanasi UP 221005, India.
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Orzalli MH, Parameswaran P. Effector-triggered immunity in mammalian antiviral defense. Trends Immunol 2022; 43:1006-17. [PMID: 36369102 DOI: 10.1016/j.it.2022.10.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 10/06/2022] [Accepted: 10/08/2022] [Indexed: 01/12/2023]
Abstract
Effector-triggered immunity (ETI) is a common defense strategy used by mammalian host cells that is engaged upon detection of the enzymatic activities of pathogen-encoded proteins or the effects of their expression on cellular homeostasis. However, in contrast to the effector-triggered responses engaged upon bacterial infection, much less is understood about the activation and consequences of these responses following viral infection. Several recent studies have identified novel mechanisms by which viruses engage ETI, highlighting the importance of these immune responses in antiviral defense. We summarize recent advances in understanding how mammalian cells sense virus-encoded effector proteins, the downstream signaling pathways that are triggered by these sensing events, and how viruses manipulate these pathways to become more successful pathogens.
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Tavabie OD, Karvellas CJ, Salehi S, Speiser JL, Rose CF, Menon K, Prachalias A, Heneghan MA, Agarwal K, Lee WM, McPhail MJW, Aluvihare VR. A novel microRNA-based prognostic model outperforms standard prognostic models in patients with acetaminophen-induced acute liver failure. J Hepatol 2021; 75:424-434. [PMID: 33857547 PMCID: PMC10668489 DOI: 10.1016/j.jhep.2021.03.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Revised: 02/26/2021] [Accepted: 03/09/2021] [Indexed: 02/06/2023]
Abstract
BACKGROUND & AIMS Acetaminophen (APAP)-induced acute liver failure (ALF) remains the most common cause of ALF in the Western world. Conventional prognostic models, utilising markers of liver injury and organ failure, lack sensitivity for mortality prediction. We previously identified a microRNA signature that is associated with successful regeneration post-auxiliary liver transplant and with recovery from APAP-ALF. Herein, we aimed to use this microRNA signature to develop outcome prediction models for APAP-ALF. METHODS We undertook a nested, case-control study using serum samples from 194 patients with APAP-ALF enrolled in the US ALF Study Group registry (1998-2014) at early (day 1-2) and late (day 3-5) time-points. A microRNA qPCR panel of 22 microRNAs was utilised to assess microRNA expression at both time-points. Multiple logistic regression was used to develop models which were compared to conventional prognostic models using the DeLong method. RESULTS Individual microRNAs confer limited prognostic value when utilised in isolation. However, incorporating them within microRNA-based outcome prediction models increases their clinical utility. Our early time-point model (AUC = 0.78, 95% CI 0.71-0.84) contained a microRNA signature associated with liver regeneration and our late time-point model (AUC = 0.83, 95% CI 0.76-0.89) contained a microRNA signature associated with cell-death. Both models were enhanced when combined with model for end-stage liver disease (MELD) score and vasopressor use and both outperformed the King's College criteria. The early time-point model combined with clinical parameters outperformed the ALF Study Group prognostic index and the MELD score. CONCLUSIONS Our findings demonstrate that a regeneration-linked microRNA signature combined with readily available clinical parameters can outperform existing prognostic models for ALF in identifying patients with poor prognosis who may benefit from transplantation. LAY SUMMARY While acute liver failure can be reversible, some patients will die without a liver transplant. We show that blood test markers that measure the potential for liver recovery may help improve identification of patients unlikely to survive acute liver failure who may benefit from a liver transplant.
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Affiliation(s)
| | - Constantine J Karvellas
- Division of Gastroenterology and Department of Critical Care Medicine, University of Alberta, Edmonton, Canada
| | - Siamak Salehi
- Institute of Liver Studies, King's College Hospital, London, UK
| | - Jaime L Speiser
- Department of Biostatistics and Data Science, Wake Forest School of Medicine, North Carolina, USA
| | - Christopher F Rose
- Hepato-neuro Laboratory, CRCHUM, Université de Montréal, Montréal, Canada
| | - Krishna Menon
- Institute of Liver Studies, King's College Hospital, London, UK
| | | | | | - Kosh Agarwal
- Institute of Liver Studies, King's College Hospital, London, UK
| | - William M Lee
- Division of Digestive and Liver Diseases, Department of Internal Medicine, University of Texas Southwestern Medical Center, Texas, USA
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Cabrera-Rodríguez R, Pérez-Yanes S, Estévez-Herrera J, Márquez-Arce D, Cabrera C, Espert L, Blanco J, Valenzuela-Fernández A. The Interplay of HIV and Autophagy in Early Infection. Front Microbiol 2021; 12:661446. [PMID: 33995324 PMCID: PMC8113651 DOI: 10.3389/fmicb.2021.661446] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [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: 01/30/2021] [Accepted: 03/31/2021] [Indexed: 12/11/2022] Open
Abstract
HIV/AIDS is still a global threat despite the notable efforts made by the scientific and health communities to understand viral infection, to design new drugs or to improve existing ones, as well as to develop advanced therapies and vaccine designs for functional cure and viral eradication. The identification and analysis of HIV-1 positive individuals that naturally control viral replication in the absence of antiretroviral treatment has provided clues about cellular processes that could interact with viral proteins and RNA and define subsequent viral replication and clinical progression. This is the case of autophagy, a degradative process that not only maintains cell homeostasis by recycling misfolded/old cellular elements to obtain nutrients, but is also relevant in the innate and adaptive immunity against viruses, such as HIV-1. Several studies suggest that early steps of HIV-1 infection, such as virus binding to CD4 or membrane fusion, allow the virus to modulate autophagy pathways preparing cells to be permissive for viral infection. Confirming this interplay, strategies based on autophagy modulation are able to inhibit early steps of HIV-1 infection. Moreover, autophagy dysregulation in late steps of the HIV-1 replication cycle may promote autophagic cell-death of CD4+ T cells or control of HIV-1 latency, likely contributing to disease progression and HIV persistence in infected individuals. In this scenario, understanding the molecular mechanisms underlying HIV/autophagy interplay may contribute to the development of new strategies to control HIV-1 replication. Therefore, the aim of this review is to summarize the knowledge of the interplay between autophagy and the early events of HIV-1 infection, and how autophagy modulation could impair or benefit HIV-1 infection and persistence, impacting viral pathogenesis, immune control of viral replication, and clinical progression of HIV-1 infected patients.
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Affiliation(s)
- Romina Cabrera-Rodríguez
- Laboratorio de Inmunología Celular y Viral, Unidad de Farmacología, Sección de Medicina, Facultad de Ciencias de la Salud, e IUETSPC de la Universidad de La Laguna, Campus de Ofra s/n, Tenerife, Spain
| | - Silvia Pérez-Yanes
- Laboratorio de Inmunología Celular y Viral, Unidad de Farmacología, Sección de Medicina, Facultad de Ciencias de la Salud, e IUETSPC de la Universidad de La Laguna, Campus de Ofra s/n, Tenerife, Spain
| | - Judith Estévez-Herrera
- Laboratorio de Inmunología Celular y Viral, Unidad de Farmacología, Sección de Medicina, Facultad de Ciencias de la Salud, e IUETSPC de la Universidad de La Laguna, Campus de Ofra s/n, Tenerife, Spain
| | - Daniel Márquez-Arce
- Laboratorio de Inmunología Celular y Viral, Unidad de Farmacología, Sección de Medicina, Facultad de Ciencias de la Salud, e IUETSPC de la Universidad de La Laguna, Campus de Ofra s/n, Tenerife, Spain
| | - Cecilia Cabrera
- AIDS Research Institute IrsiCaixa, Institut de Recerca en Ciències de la Salut Germans Trias i Pujol (IGTP), Barcelona, Spain
| | - Lucile Espert
- Institut de Recherche en Infectiologie de Montpellier, Université de Montpellier, CNRS, Montpellier, France
| | - Julià Blanco
- AIDS Research Institute IrsiCaixa, Institut de Recerca en Ciències de la Salut Germans Trias i Pujol (IGTP), Barcelona, Spain.,Universitat de Vic-Central de Catalunya (UVIC-UCC), Catalonia, Spain
| | - Agustín Valenzuela-Fernández
- Laboratorio de Inmunología Celular y Viral, Unidad de Farmacología, Sección de Medicina, Facultad de Ciencias de la Salud, e IUETSPC de la Universidad de La Laguna, Campus de Ofra s/n, Tenerife, Spain
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Vilanova L, Valero-Jiménez CA, van Kan JAL. Deciphering the Monilinia fructicola Genome to Discover Effector Genes Possibly Involved in Virulence. Genes (Basel) 2021; 12:568. [PMID: 33919788 DOI: 10.3390/genes12040568] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 04/06/2021] [Accepted: 04/08/2021] [Indexed: 12/18/2022] Open
Abstract
Brown rot is the most economically important fungal disease of stone fruits and is primarily caused by Monilinia laxa and Monlinia fructicola. Both species co-occur in European orchards although M. fructicola is considered to cause the most severe yield losses in stone fruit. This study aimed to generate a high-quality genome of M. fructicola and to exploit it to identify genes that may contribute to pathogen virulence. PacBio sequencing technology was used to assemble the genome of M. fructicola. Manual structural curation of gene models, supported by RNA-Seq, and functional annotation of the proteome yielded 10,086 trustworthy gene models. The genome was examined for the presence of genes that encode secreted proteins and more specifically effector proteins. A set of 134 putative effectors was defined. Several effector genes were cloned into Agrobacterium tumefaciens for transient expression in Nicotiana benthamiana plants, and some of them triggered necrotic lesions. Studying effectors and their biological properties will help to better understand the interaction between M. fructicola and its stone fruit host plants.
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Sharma V, Mutsuddi M, Mukherjee A. Deltex cooperates with TRAF6 to promote apoptosis and cell migration through Eiger-independent JNK activation in Drosophila. Cell Biol Int 2020; 45:686-700. [PMID: 33300258 DOI: 10.1002/cbin.11521] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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: 07/24/2020] [Revised: 12/02/2020] [Accepted: 12/06/2020] [Indexed: 12/20/2022]
Abstract
JNK signaling is a highly conserved signaling pathway that regulates a broad spectrum of cellular processes including cell proliferation, migration, and apoptosis. In Drosophila, JNK signaling is activated by binding of the tumor necrosis factor (TNF) Eiger to its receptor Wengen, and a conserved signaling cascade operates that culminates into activation of dual phosphatase Puckered thereby triggering apoptosis. The tumor necrosis factor receptor (TNFR) associated factor 6 (TRAF6) is an adaptor protein, which transduces the signal from TNFRs and Toll-like receptor/interleukin-1 receptor superfamily to induce a wide spectrum of cellular responses. TRAF6 also acts as the adaptor protein that mediates Eiger/JNK signaling in Drosophila. In a genetic interaction study, deltex (Dx) was identified as a novel interactor of TRAF6. Dx is well known to regulate Notch signaling in a context-dependent manner. Our data suggest that combinatorial action of Dx and TRAF6 enhances the Dx-induced wing nicking phenotype by inducing caspase-mediated cell death. Co-expression of Dx and TRAF6 also results in enhanced invasive behavior and perturbs the normal morphology of cells. The cooperative action of Dx and TRAF6 is attributed to JNK activation, which also leads to ectopic wingless (Wg) and decapentaplegic (Dpp) expression. Our results also reveal that the endocytic pathway component Rab7 may play a pivotal role in the regulation of Dx-TRAF6-mediated activation of JNK signaling. Here, we present the fact that Dx and TRAF6 together activate JNK signaling in an Eiger-independent mechanism.
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Affiliation(s)
- Vartika Sharma
- Department of Molecular and Human Genetics, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, India
| | - Mousumi Mutsuddi
- Department of Molecular and Human Genetics, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, India
| | - Ashim Mukherjee
- Department of Molecular and Human Genetics, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, India
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He H, Liu S, Wu D, Xu B. Enzymatically Formed Peptide Assemblies Sequestrate Proteins and Relocate Inhibitors to Selectively Kill Cancer Cells. Angew Chem Int Ed Engl 2020; 59:16445-16450. [PMID: 32521103 PMCID: PMC7844580 DOI: 10.1002/anie.202006290] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Indexed: 12/24/2022]
Abstract
Herein, we show that an enzymatic reaction can generate peptide assemblies that sequestrate proteins to selectively kill cancer cells. A phosphopeptide bearing the antagonistic motif (AVPI) to the inhibitors of apoptotic proteins (IAPs) enters cancer cells and normal cells by caveolin-dependent endocytosis and macropinocytosis, respectively. The AVPI-bearing peptide assemblies sequestrates IAPs and releases bortezomib (BTZ), a proteasome inhibitor, in the cytosol of cancer cells, but rescues the normal cells (namely, HS-5 cells) by trafficking the BTZ into lysosomes. Alkaline phosphatase (ALP) acts as a context-dependent signal for trafficking the peptide/BTZ assemblies and selectively induces the death of the cancer cells. The assemblies of AVPI exhibit enhanced proteolytic resistance. This work, which utilizes the difference in endocytic uptake of enzymatically formed peptide assemblies to selectively kill cancer cells, promises a new way to develop selective cancer therapeutics.
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Affiliation(s)
- Hongjian He
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, MA, 02453, USA
| | - Shuang Liu
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, MA, 02453, USA
| | - Difei Wu
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, MA, 02453, USA
| | - Bing Xu
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, MA, 02453, USA
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Ali M, Li QH, Zou T, Wei AM, Gombojab G, Lu G, Gong ZH. Chitinase Gene Positively Regulates Hypersensitive and Defense Responses of Pepper to Colletotrichum acutatum Infection. Int J Mol Sci 2020; 21:E6624. [PMID: 32927746 DOI: 10.3390/ijms21186624] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 08/27/2020] [Accepted: 09/07/2020] [Indexed: 12/14/2022] Open
Abstract
Anthracnose caused by Colletotrichum acutatum is one of the most devastating fungal diseases of pepper (Capsicum annuum L.). The utilization of chitin-binding proteins or chitinase genes is the best option to control this disease. A chitin-binding domain (CBD) has been shown to be crucial for the innate immunity of plants and activates the hypersensitive response (HR). The CaChiIII7 chitinase gene has been identified and isolated from pepper plants. CaChiIII7 has repeated CBDs that encode a chitinase enzyme that is transcriptionally stimulated by C. acutatum infection. The knockdown of CaChiIII7 in pepper plants confers increased hypersensitivity to C. acutatum, resulting in its proliferation in infected leaves and an attenuation of the defense response genes CaPR1, CaPR5, and SAR8.2 in the CaChiIII7-silenced pepper plants. Additionally, H2O2 accumulation, conductivity, proline biosynthesis, and root activity were distinctly reduced in CaChiIII7-silenced plants. Subcellular localization analyses indicated that the CaChiIII7 protein is located in the plasma membrane and cytoplasm of plant cells. The transient expression of CaChiIII7 increases the basal resistance to C. acutatum by significantly expressing several defense response genes and the HR in pepper leaves, accompanied by an induction of H2O2 biosynthesis. These findings demonstrate that CaChiIII7 plays a prominent role in plant defense in response to pathogen infection.
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Bulvik R, Breuer R, Dvir-Ginzberg M, Reich E, Berkman N, Wallach-Dayan SB. SIRT1 Deficiency, Specifically in Fibroblasts, Decreases Apoptosis Resistance and Is Associated with Resolution of Lung-Fibrosis. Biomolecules 2020; 10:biom10070996. [PMID: 32630813 PMCID: PMC7407379 DOI: 10.3390/biom10070996] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 05/07/2020] [Revised: 06/16/2020] [Accepted: 06/29/2020] [Indexed: 12/11/2022] Open
Abstract
In contrast to normal regenerating tissue, resistance to Fas- and FasL-positive T cell-induced apoptosis were detected in myofibroblasts from fibrotic-lungs of humans and mice following bleomycin (BLM) exposure. In this study we show, decreased FLIP expression in lung-tissues with resolution of BLM-induced fibrosis and in isolated-lung fibroblasts, with decreased resistance to apoptosis. Using a FLIP-expression vector or a shFLIP-RNA, we further confirmed the critical need for FLIP to regain/lose susceptibility of fibrotic-lung myofibroblast to Fas-induced apoptosis. Our study further show that FLIP is regulated by SIRT1 (Sirtuin 1) deacetylase. Chimeric mice, with SIRT1-deficiency in deacetylase domain (H355Y-Sirt1y/y), specifically in mesenchymal cells, were not only protected from BLM-induced lung fibrosis but, as assessed following Ku70 immunoprecipitation, had also decreased Ku70-deacetylation, decreasedKu70/FLIP complex, and decreased FLIP levels in their lung myofibroblasts. In addition, myofibroblasts isolated from lungs of BLM-treated miR34a-knockout mice, exposed to a miR34a mimic, which we found here to downregulate SIRT1 in the luciferase assay, had a decreased Ku70-deacetylation indicating decrease in SIRT1 activity. Thus, SIRT1 may mediate, miR34a-regulated, persistent FLIP levels by deacetylation of Ku70 in lung myofibroblasts, promoting resistance to cell-death and lung fibrosis.
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Affiliation(s)
- Raanan Bulvik
- Lung Cellular and Molecular Biology Laboratory, Institute of Pulmonary Medicine, Hadassah—Hebrew University Medical Center, POB 12000, Jerusalem 91120, Israel; (R.B.); (R.B.); (N.B.)
| | - Raphael Breuer
- Lung Cellular and Molecular Biology Laboratory, Institute of Pulmonary Medicine, Hadassah—Hebrew University Medical Center, POB 12000, Jerusalem 91120, Israel; (R.B.); (R.B.); (N.B.)
- Department of Pathology and Laboratory Medicine, 670 Albany St, 4th Floor, Boston University School of Medicine, Boston, MA 02118, USA
| | - Mona Dvir-Ginzberg
- Institute of Dental Sciences, Faculty of Dental Medicine, Hebrew University-Hadassah, POB 12065, Jerusalem 9112102, Israel; (M.D.-G.); (E.R.)
| | - Eli Reich
- Institute of Dental Sciences, Faculty of Dental Medicine, Hebrew University-Hadassah, POB 12065, Jerusalem 9112102, Israel; (M.D.-G.); (E.R.)
| | - Neville Berkman
- Lung Cellular and Molecular Biology Laboratory, Institute of Pulmonary Medicine, Hadassah—Hebrew University Medical Center, POB 12000, Jerusalem 91120, Israel; (R.B.); (R.B.); (N.B.)
| | - Shulamit B. Wallach-Dayan
- Lung Cellular and Molecular Biology Laboratory, Institute of Pulmonary Medicine, Hadassah—Hebrew University Medical Center, POB 12000, Jerusalem 91120, Israel; (R.B.); (R.B.); (N.B.)
- Correspondence: ; Tel.: +972-2-6776622
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Castellanos-Rubio I, Rodrigo I, Olazagoitia-Garmendia A, Arriortua O, Gil de Muro I, Garitaonandia JS, Bilbao JR, Fdez-Gubieda ML, Plazaola F, Orue I, Castellanos-Rubio A, Insausti M. Highly Reproducible Hyperthermia Response in Water, Agar, and Cellular Environment by Discretely PEGylated Magnetite Nanoparticles. ACS Appl Mater Interfaces 2020; 12:27917-27929. [PMID: 32464047 PMCID: PMC8489799 DOI: 10.1021/acsami.0c03222] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Local heat generation from magnetic nanoparticles (MNPs) exposed to alternating magnetic fields can revolutionize cancer treatment. However, the application of MNPs as anticancer agents is limited by serious drawbacks. Foremost among these are the fast uptake and biodegradation of MNPs by cells and the unpredictable magnetic behavior of the MNPs when they accumulate within or around cells and tissues. In fact, several studies have reported that the heating power of MNPs is severely reduced in the cellular environment, probably due to a combination of increased viscosity and strong NP agglomeration. Herein, we present an optimized protocol to coat magnetite (Fe3O4) NPs larger than 20 nm (FM-NPs) with high molecular weight PEG molecules that avoid collective coatings, prevent the formation of large clusters of NPs and keep constant their high heating performance in environments with very different ionic strengths and viscosities (distilled water, physiological solutions, agar and cell culture media). The great reproducibility and reliability of the heating capacity of this FM-NP@PEG system in such different environments has been confirmed by AC magnetometry and by more conventional calorimetric measurements. The explanation of this behavior has been shown to lie in preserving as much as possible the magnetic single domain-type behavior of nearly isolated NPs. In vitro endocytosis experiments in a colon cancer-derived cell line indicate that FM-NP@PEG formulations with PEGs of higher molecular weight (20 kDa) are more resistant to endocytosis than formulations with smaller PEGs (5 kDa), showing quite large uptake mean-life (τ > 5 h) in comparison with other NP systems. The in vitro magnetic hyperthermia was performed at 21 mT and 650 kHz during 1 h in a pre-endocytosis stage and complete cell death was achieved 48 h posthyperthermia. These optimal FM-NP@PEG formulations with high resistance to endocytosis and predictable magnetic response will aid the progress and accuracy of the emerging era of theranostics.
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Affiliation(s)
- Idoia Castellanos-Rubio
- Departamento de Química Inorgánica, Facultad de Ciencia y Tecnología, UPV/EHU, Barrio Sarriena s/n, 48940, Leioa, Spain
- Department of Electricidad
y Electrónica, Facultad de Ciencia
y Tecnología, UPV/EHU, Barrio
Sarriena s/n, 48940, Leioa, Spain
- (I.C.-R.)
| | - Irati Rodrigo
- Department of Electricidad
y Electrónica, Facultad de Ciencia
y Tecnología, UPV/EHU, Barrio
Sarriena s/n, 48940, Leioa, Spain
- BC Materials, Basque Center for Materials, Applications, and Nanostructures, Barrio Sarriena s/n, 48940, Leioa, Spain
| | - Ane Olazagoitia-Garmendia
- Departamento de
Genética, Antropología Física y Fisiología
Animal, Facultad de Medicina y Enfermería, Barrio Sarriena s/n, 48940, Leioa, Spain
- Biocruces Bizkaia
Health Research Institute, Cruces Plaza, 48903, Barakaldo, Spain
| | - Oihane Arriortua
- Departamento de Química Inorgánica, Facultad de Ciencia y Tecnología, UPV/EHU, Barrio Sarriena s/n, 48940, Leioa, Spain
| | - Izaskun Gil de Muro
- Departamento de Química Inorgánica, Facultad de Ciencia y Tecnología, UPV/EHU, Barrio Sarriena s/n, 48940, Leioa, Spain
| | - José S. Garitaonandia
- Departamento de Física
Aplicada II, Facultad de Ciencia y Tecnología,
UPV/EHU, Barrio Sarriena s/n, 48940, Leioa, Spain
| | - Jose Ramón Bilbao
- Departamento de
Genética, Antropología Física y Fisiología
Animal, Facultad de Medicina y Enfermería, Barrio Sarriena s/n, 48940, Leioa, Spain
- Biocruces Bizkaia
Health Research Institute, Cruces Plaza, 48903, Barakaldo, Spain
- Spanish Biomedical Research Center in Diabetes and Associated Metabolic
Diseases (CIBERDEM), 28029 Madrid, Spain
| | - M. Luisa Fdez-Gubieda
- Department of Electricidad
y Electrónica, Facultad de Ciencia
y Tecnología, UPV/EHU, Barrio
Sarriena s/n, 48940, Leioa, Spain
| | - Fernando Plazaola
- Department of Electricidad
y Electrónica, Facultad de Ciencia
y Tecnología, UPV/EHU, Barrio
Sarriena s/n, 48940, Leioa, Spain
| | - Iñaki Orue
- SGIker, Servicios
Generales de Investigación, UPV/EHU, Barrio Sarriena s/n, 48940, Leioa, Spain
| | - Ainara Castellanos-Rubio
- Departamento de
Genética, Antropología Física y Fisiología
Animal, Facultad de Medicina y Enfermería, Barrio Sarriena s/n, 48940, Leioa, Spain
- Biocruces Bizkaia
Health Research Institute, Cruces Plaza, 48903, Barakaldo, Spain
- Spanish Biomedical Research Center in Diabetes and Associated Metabolic
Diseases (CIBERDEM), 28029 Madrid, Spain
- IKERBASQUE Basque Foundation for Science, 48013, Bilbao, Spain
| | - Maite Insausti
- Departamento de Química Inorgánica, Facultad de Ciencia y Tecnología, UPV/EHU, Barrio Sarriena s/n, 48940, Leioa, Spain
- BC Materials, Basque Center for Materials, Applications, and Nanostructures, Barrio Sarriena s/n, 48940, Leioa, Spain
- (M.I.)
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11
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Bulvik R, Biton M, Berkman N, Breuer R, Wallach-Dayan SB. Forefront: MiR-34a-Knockout Mice with Wild Type Hematopoietic Cells, Retain Persistent Fibrosis Following Lung Injury. Int J Mol Sci 2020; 21:E2228. [PMID: 32210149 DOI: 10.3390/ijms21062228] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2020] [Revised: 03/15/2020] [Accepted: 03/19/2020] [Indexed: 12/19/2022] Open
Abstract
MicroRNAs (miRs) are known to limit gene expression at the post-transcriptional level and have important roles in the pathogenesis of various conditions, including acute lung injury (ALI) and fibrotic diseases such as idiopathic pulmonary fibrosis (IPF). In this study, we found increased levels of miR-34 at times of fibrosis resolution following injury, in myofibroblasts from Bleomycin-treated mouse lungs, which correlates with susceptibility to cell death induced by immune cells. On the contrary, a substantial downregulation of miR-34 was detected at stages of evolution, when fibroblasts resist cell death. Concomitantly, we found an inverse correlation between miR-34 levels with that of the survival molecule FLICE-like inhibitory protein (FLIP) in lung myofibroblasts from humans with IPF and the experimental model. Forced upregulation of miR-34 with miR-34 mimic in human IPF fibrotic-lung myofibroblasts led to decreased cell survival through downregulation of FLIP. Using chimeric miR-34 knock-out (KO)-C57BL/6 mice with miR34KO myofibroblasts but wild-type (WT) hematopoietic cells, we found, in contrast to WT mice, increased and persistent FLIP levels with a more severe fibrosis and with no signs of resolution as detected in pathology and collagen accumulation. Moreover, a mimic of miR-34a decreased FLIP expression and susceptibility to cell death was regained in miR-34KO fibroblasts. Through this study, we show for the first time an inverse correlation between miR-34a and FLIP expression in myofibroblasts, which affects survival, and accumulation in lung fibrosis. Reprogramming fibrotic-lung myofibroblasts to regain susceptibility to cell-death by specifically increasing their miR34a and downregulating FLIP, may be a useful strategy, enabling tissue regeneration following lung injury.
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Shah J, Rouaud F, Guerrera D, Vasileva E, Popov LM, Kelley WL, Rubinstein E, Carette JE, Amieva MR, Citi S. A Dock-and-Lock Mechanism Clusters ADAM10 at Cell-Cell Junctions to Promote α-Toxin Cytotoxicity. Cell Rep 2019; 25:2132-2147.e7. [PMID: 30463011 DOI: 10.1016/j.celrep.2018.10.088] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [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: 05/18/2018] [Revised: 10/01/2018] [Accepted: 10/24/2018] [Indexed: 01/08/2023] Open
Abstract
We previously identified PLEKHA7 and other junctional proteins as host factors mediating death by S. aureus α-toxin, but the mechanism through which junctions promote toxicity was unclear. Using cell biological and biochemical methods, we now show that ADAM10 is docked to junctions by its transmembrane partner Tspan33, whose cytoplasmic C terminus binds to the WW domain of PLEKHA7 in the presence of PDZD11. ADAM10 is locked at junctions through binding of its cytoplasmic C terminus to afadin. Junctionally clustered ADAM10 supports the efficient formation of stable toxin pores. Instead, disruption of the PLEKHA7-PDZD11 complex inhibits ADAM10 and toxin junctional clustering. This promotes toxin pore removal from the cell surface through an actin- and macropinocytosis-dependent process, resulting in cell recovery from initial injury and survival. These results uncover a dock-and-lock molecular mechanism to target ADAM10 to junctions and provide a paradigm for how junctions regulate transmembrane receptors through their clustering.
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Affiliation(s)
- Jimit Shah
- Department of Cell Biology, Faculty of Sciences, University of Geneva, 1211-4 Geneva, Switzerland; Institute for Genetics and Genomics of Geneva (iGE3), University of Geneva, 1211-4 Geneva, Switzerland
| | - Florian Rouaud
- Department of Cell Biology, Faculty of Sciences, University of Geneva, 1211-4 Geneva, Switzerland; Institute for Genetics and Genomics of Geneva (iGE3), University of Geneva, 1211-4 Geneva, Switzerland
| | - Diego Guerrera
- Department of Cell Biology, Faculty of Sciences, University of Geneva, 1211-4 Geneva, Switzerland; Institute for Genetics and Genomics of Geneva (iGE3), University of Geneva, 1211-4 Geneva, Switzerland
| | - Ekaterina Vasileva
- Department of Cell Biology, Faculty of Sciences, University of Geneva, 1211-4 Geneva, Switzerland; Institute for Genetics and Genomics of Geneva (iGE3), University of Geneva, 1211-4 Geneva, Switzerland
| | - Lauren M Popov
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - William L Kelley
- Department of Microbiology and Molecular Medicine, Faculty of Medicine, University of Geneva, 1211-4 Geneva, Switzerland
| | - Eric Rubinstein
- INSERM, Université Paris-Sud, UMRS_935, 94807 Villejuif Cedex, France
| | - Jan E Carette
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Manuel R Amieva
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Sandra Citi
- Department of Cell Biology, Faculty of Sciences, University of Geneva, 1211-4 Geneva, Switzerland; Institute for Genetics and Genomics of Geneva (iGE3), University of Geneva, 1211-4 Geneva, Switzerland.
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13
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Morikawa S, Kaneko N, Okumura C, Taguchi H, Kurata M, Yamamoto T, Osawa H, Nakanishi A, Zako T, Masumoto J. IAPP/amylin deposition, which is correlated with expressions of ASC and IL-1β in β-cells of Langerhans' islets, directly initiates NLRP3 inflammasome activation. Int J Immunopathol Pharmacol 2018; 32:2058738418788749. [PMID: 30014749 PMCID: PMC6050799 DOI: 10.1177/2058738418788749] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [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] [Indexed: 12/26/2022] Open
Abstract
Recent findings revealed that type 2 diabetes mellitus (T2D) is a chronic inflammatory disease and an islet amyloid polypeptide (IAPP)/amylin, is deposited within pancreatic islets. IAPP/amylin has been reported to activate NACHT, LRR, and PYD domains-containing protein 3 (NLRP3) inflammasome in infiltrated macrophages. NLRP3, an intracellular pattern recognition receptor, has been shown to recognize pathogens and/or metabolites and complexes with the adopter protein apoptosis-associated speck-like protein containing a caspase-recruitment domain ASC to form a huge complex, called an inflammasome, an interleukin (IL)-1β-processing platform. Although reactive oxygen species (ROS) were reported to be involved in activation of NLRP3 inflammasome, we were hypothesized that IAPP could directly activate NLRP3 inflammasome, leading to islets β-cell death. We analyzed expression of the inflammasome components ASC, NLRP3, caspase-1, IL-1β, IAPP/amylin, and insulin immunohistochemically in Langerhans' islets of autopsy cases. The initial event of NLRP3 inflammasome activation was assessed using a cell-free system consisting of NLRP3 and ASC with the amplified luminescent proximity homogeneous assay. IAPP/amylin deposition in Langerhans' islets was detected and significantly correlated with expressions of IL-1β and ASC. IAPP/amylin directly interacted with NLRP3 and initiated an interaction between NLRP3 and ASC in a cell-free system. The deposition of IAPP/amylin in β-cells of Langerhans' islets may act together with the expression level of an inflammasome component, ASC, to regulate IL-1β processing, and directly lead to the dysfunction of β-cells. The interaction between IAPP/amylin and NLRP3 could be an attractive drug target to avoid both inflammation and β-cell death for T2D therapy.
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Affiliation(s)
- Shinnosuke Morikawa
- 1 Department of Pathology, Proteo-Science Center and Graduate School of Medicine, Ehime University, Toon, Japan
| | - Naoe Kaneko
- 1 Department of Pathology, Proteo-Science Center and Graduate School of Medicine, Ehime University, Toon, Japan
| | - Chikara Okumura
- 1 Department of Pathology, Proteo-Science Center and Graduate School of Medicine, Ehime University, Toon, Japan
| | - Haruka Taguchi
- 1 Department of Pathology, Proteo-Science Center and Graduate School of Medicine, Ehime University, Toon, Japan
| | - Mie Kurata
- 1 Department of Pathology, Proteo-Science Center and Graduate School of Medicine, Ehime University, Toon, Japan
| | - Toshihiro Yamamoto
- 1 Department of Pathology, Proteo-Science Center and Graduate School of Medicine, Ehime University, Toon, Japan
| | - Haruhiko Osawa
- 2 Department of Diabetes and Molecular Genetics, Graduate School of Medicine, Ehime University, Toon, Japan
| | - Ayaka Nakanishi
- 3 Department of Chemistry and Biology, Graduate School of Science and Engineering, Ehime University, Matsuyama, Japan
| | - Tamotsu Zako
- 3 Department of Chemistry and Biology, Graduate School of Science and Engineering, Ehime University, Matsuyama, Japan
| | - Junya Masumoto
- 1 Department of Pathology, Proteo-Science Center and Graduate School of Medicine, Ehime University, Toon, Japan
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14
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Khan GN, Kim EJ, Shin TS, Lee SH. Azacytidine-induced Chemosensitivity to Doxorubicin in Human Breast Cancer MCF7 Cells. Anticancer Res 2017; 37:2355-2364. [PMID: 28476801 DOI: 10.21873/anticanres.11573] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [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: 03/16/2017] [Revised: 04/01/2017] [Accepted: 04/03/2017] [Indexed: 11/10/2022]
Abstract
BACKGROUND/AIM It is necessary to select an appropriate strategy that makes cancer cells more sensitive to chemotherapeutic drug(s). The aim of this study was to further explore the mechanism(s) behind drug sensitization in the breast cancer MCF7 cell line using 5-azacytidine (AzaC) pretreatment in doxorubicin (Dox) chemotherapy. MATERIALS AND METHODS Cells were treated with either AzaC or Dox alone or in combination (AzaC+Dox) for 24 and 48 h. Cells were also pretreated with AzaC for a week before replacement with Dox at varying concentrations in another group of experiments (AzaC/Dox) for 24 and 48 h. The cells in the groups were subjected to cytochemical analyses, including 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazoliumbromide (MTT), intracellular reactive oxygen species (ROS) and cell death by dual staining with Hoechst33342 (Hoechst) and propidium iodide (PI). Cells were also analyzed for determining specific alterations of possible target proteins by western blot. RESULTS Compared to a single (AzaC and Dox) or simultaneous drug exposure (AzaC+Dox), cellular activity was significantly reduced in AzaC/Dox group of cells in a dose- and time-dependent manner (p<0.05). The clonogenic potential of cells was also significantly inhibited in AzaC/Dox compared to Dox and AzaC group after 7 days (p<0.05). The rates of ROS-generated and PI-stained cells were significantly higher in the AzaC+Dox and AzaC/Dox groups compared to those of individual drug groups at 48 h (p<0.05). These observations were accompanied by activation of ERK1/2 and p38MAPK, as well as up-regulation of BAX and P53 in the AzaC/Dox group. However, the levels of BCL-2 were down-regulated in Dox and AzaC+Dox among a different group of cells. Elevated levels of activated caspase-3 were observed only in AzaC/Dox group of cells. The levels of phospho-nuclear factor-kappa B (pNF-ĸB)(Thr) decreased with increasing dosage of Dox in different groups, while down-regulation of heat shock protein 70 (HSP70) was observed only in the AzaC+Dox group of cells. CONCLUSION AzaC significantly increases the sensitivity of MCF7 cells to Dox via activation of ERK1/2, P53, BAX and caspase-3. Moreover, the inhibition of pNF-ĸB(Thr) and HSP70 might also contribute to an increase in the sensitivity of MCF7 cells to Dox.
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Affiliation(s)
- Gul Nabi Khan
- Division of Life Sciences, Korea University, Seoul, Republic of Korea
| | - Eun Jin Kim
- Division of Life Sciences, Korea University, Seoul, Republic of Korea
| | - Tae Seop Shin
- Division of Life Sciences, Korea University, Seoul, Republic of Korea
| | - Sang Ho Lee
- Division of Life Sciences, Korea University, Seoul, Republic of Korea
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15
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He K, Gou X, Powell RA, Yang H, Yuan T, Guo Z, Li J. Receptor-like protein kinases, BAK1 and BKK1, regulate a light-dependent cell-death control pathway. Plant Signal Behav 2008; 3:813-5. [PMID: 19704566 PMCID: PMC2634381 DOI: 10.4161/psb.3.10.5890] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2008] [Accepted: 03/11/2008] [Indexed: 05/24/2023]
Abstract
BAK1 and BKK1 are two functionally redundant leucine-rich repeat receptor-like protein kinases (LRR-RLKs) involved in brassinosteroid signal transduction by their direct interactions with the BR receptor, BRI1. Recent studies from our group and others indicated that the two RLKs also play critical roles in regulating pathogen-related and pathogen-unrelated cell-death controls. Genetic data suggest that the two kinases are essential for plant survival because the double mutants show spontaneous cell-death and seedling lethality phenotypes. Physiological analyses further suggest that the cell-death of the double mutant is triggered by the light, as dark-grown seedlings do not show any cell-death symptoms. These observations indicate that BAK1 and BKK1 regulate a novel signaling pathway to detoxify or to limit the production of a yet unknown toxin/toxins produced by plants under light conditions.
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Affiliation(s)
- Kai He
- Department of Botany and Microbiology; University of Oklahoma; Norman, Oklahoma USA
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16
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Bhargava A, Meijer OC, Dallman MF, Pearce D. Plasma membrane calcium pump isoform 1 gene expression is repressed by corticosterone and stress in rat hippocampus. J Neurosci 2000; 20:3129-38. [PMID: 10777776 PMCID: PMC6773119] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023] Open
Abstract
Glucocorticoids (GCs) are critical to learning and memory, in large part because of their actions in the hippocampus. Chronic high levels of GCs have profound effects on hippocampal structure and function and can even result in irreversible neurodegeneration. Hippocampal GC actions are mediated by intracellular receptors that modulate the transcription of specific target genes. In a screen for genes repressed by GCs in rat hippocampus, we identified plasma membrane calcium pump isoform 1 (PMCA1), a plasma membrane calcium ATPase. In Northern blots, PMCA1 was repressed approximately 33% after a high, but not a low dose of the GC, corticosterone (B), suggesting glucocorticoid (but not mineralocorticoid) receptor-mediated repression. Furthermore, in situ hybridization demonstrated that B significantly downregulated PMCA1 mRNA in all brain regions examined. Repression of PMCA1 was also observed in cultured hippocampal neurons, but only when the cells were in the differentiated state. Stress also repressed PMCA1 expression in hippocampus of adrenal-intact animals, and a clear inverse correlation between B level and PMCA1 mRNA could be discerned. However, other non-B-dependent factors appeared to be involved in the response of PMCA1 to stress because, unlike exogenous B, cold stress did not repress PMCA1 in brain regions other than hippocampus. Moreover, in the presence of constant B (B-replaced, adrenalectomized animals), cold stress led to increased hippocampal PMCA1 expression. These observations suggest that repression of PMCA1 represents one molecular mechanism by which corticosteroids regulate Ca(2+) homeostasis and hence influence neuronal activity. Moreover, other stress-related neurohumoral factors appear to counter the repressive effects of B. Defects in the balance between GC-mediated and non-GC-mediated effects on PMCA1 expression may have adverse effects on neuronal function and ultimately result in irreversible neuronal damage.
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Affiliation(s)
- A Bhargava
- Division of Nephrology, Department of Medicine, and Biomedical Sciences Program, University of California, San Francisco, San Francisco, California 94143, USA
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