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Arndt H, Bachurski M, Yuanxiang P, Franke K, Wessjohann LA, Kreutz MR, Grochowska KM. A Screen of Plant-Based Natural Products Revealed That Quercetin Prevents Pyroglutamylated Amyloid-β (Aβ3(pE)-42) Uptake in Astrocytes As Well As Resulting Astrogliosis and Synaptic Dysfunction. Mol Neurobiol 2024:10.1007/s12035-024-04509-6. [PMID: 39317890 DOI: 10.1007/s12035-024-04509-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2024] [Accepted: 09/16/2024] [Indexed: 09/26/2024]
Abstract
Two connected histopathological hallmarks of Alzheimer's disease (AD) are chronic neuroinflammation and synaptic dysfunction. The accumulation of the most prevalent posttranslationally modified form of Aβ1-42, pyroglutamylated amyloid-β (Aβ3(pE)-42) in astrocytes is directly linked to glial activation and the release of proinflammatory cytokines that in turn contribute to early synaptic dysfunction in AD. At present, the mechanisms of Aβ3(pE)-42 uptake to astrocytes are unknown and pharmacological interventions that interfere with this process are not available. Here we developed a simple screening assay to identify substances from a plant extract library that prevent astroglial Aβ3(pE)-42 uptake. We first show that this approach yields valid and reproducible results. Second, we show endocytosis of Aβ3(pE)-42 oligomers by astrocytes and that quercetin, a plant flavonol, is effective to specifically block astrocytic buildup of oligomeric Aβ3(pE)-42. Importantly, quercetin does not induce a general impairment of endocytosis. However, it efficiently protects against early synaptic dysfunction following exogenous Aβ3(pE)-42 application.
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Affiliation(s)
- Helene Arndt
- Research Group Neuroplasticity, Leibniz Institute for Neurobiology, 39118, Magdeburg, Germany
| | - Mark Bachurski
- Research Group Neuroplasticity, Leibniz Institute for Neurobiology, 39118, Magdeburg, Germany
| | - PingAn Yuanxiang
- Research Group Neuroplasticity, Leibniz Institute for Neurobiology, 39118, Magdeburg, Germany
| | - Katrin Franke
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06108, Halle, Germany
- Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, 06108, Halle, Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, 04103, Leipzig, Germany
| | - Ludger A Wessjohann
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06108, Halle, Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, 04103, Leipzig, Germany
- Institut Für Chemie, Chair of Natural Products Chemistry, Martin-Luther-University Halle-Wittenberg, 06120, Halle (Saale), Germany
| | - Michael R Kreutz
- Research Group Neuroplasticity, Leibniz Institute for Neurobiology, 39118, Magdeburg, Germany.
- Leibniz Group 'Dendritic Organelles and Synaptic Function', Center for Molecular Neurobiology, ZMNH, University Medical Center Hamburg-Eppendorf, 20251, Hamburg, Germany.
- German Center for Neurodegenerative Diseases (DZNE), 39120, Magdeburg, Germany.
- Center for Behavioral Brain Sciences, Otto Von Guericke University, 39120, Magdeburg, Germany.
| | - Katarzyna M Grochowska
- Research Group Neuroplasticity, Leibniz Institute for Neurobiology, 39118, Magdeburg, Germany.
- Leibniz Group 'Dendritic Organelles and Synaptic Function', Center for Molecular Neurobiology, ZMNH, University Medical Center Hamburg-Eppendorf, 20251, Hamburg, Germany.
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Žugec M, Furlani B, Castañon MJ, Rituper B, Fischer I, Broggi G, Caltabiano R, Barbagallo GMV, Di Rosa M, Tibullo D, Parenti R, Vicario N, Simčič S, Pozo Devoto VM, Stokin GB, Wiche G, Jorgačevski J, Zorec R, Potokar M. Plectin plays a role in the migration and volume regulation of astrocytes: a potential biomarker of glioblastoma. J Biomed Sci 2024; 31:14. [PMID: 38263015 PMCID: PMC10807171 DOI: 10.1186/s12929-024-01002-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 01/09/2024] [Indexed: 01/25/2024] Open
Abstract
BACKGROUND The expression of aquaporin 4 (AQP4) and intermediate filament (IF) proteins is altered in malignant glioblastoma (GBM), yet the expression of the major IF-based cytolinker, plectin (PLEC), and its contribution to GBM migration and invasiveness, are unknown. Here, we assessed the contribution of plectin in affecting the distribution of plasmalemmal AQP4 aggregates, migratory properties, and regulation of cell volume in astrocytes. METHODS In human GBM, the expression of glial fibrillary acidic protein (GFAP), AQP4 and PLEC transcripts was analyzed using publicly available datasets, and the colocalization of PLEC with AQP4 and with GFAP was determined by immunohistochemistry. We performed experiments on wild-type and plectin-deficient primary and immortalized mouse astrocytes, human astrocytes and permanent cell lines (U-251 MG and T98G) derived from a human malignant GBM. The expression of plectin isoforms in mouse astrocytes was assessed by quantitative real-time PCR. Transfection, immunolabeling and confocal microscopy were used to assess plectin-induced alterations in the distribution of the cytoskeleton, the influence of plectin and its isoforms on the abundance and size of plasmalemmal AQP4 aggregates, and the presence of plectin at the plasma membrane. The release of plectin from cells was measured by ELISA. The migration and dynamics of cell volume regulation of immortalized astrocytes were assessed by the wound-healing assay and calcein labeling, respectively. RESULTS A positive correlation was found between plectin and AQP4 at the level of gene expression and protein localization in tumorous brain samples. Deficiency of plectin led to a decrease in the abundance and size of plasmalemmal AQP4 aggregates and altered distribution and bundling of the cytoskeleton. Astrocytes predominantly expressed P1c, P1e, and P1g plectin isoforms. The predominant plectin isoform associated with plasmalemmal AQP4 aggregates was P1c, which also affected the mobility of astrocytes most prominently. In the absence of plectin, the collective migration of astrocytes was impaired and the dynamics of cytoplasmic volume changes in peripheral cell regions decreased. Plectin's abundance on the plasma membrane surface and its release from cells were increased in the GBM cell lines. CONCLUSIONS Plectin affects cellular properties that contribute to the pathology of GBM. The observed increase in both cell surface and released plectin levels represents a potential biomarker and therapeutic target in the diagnostics and treatment of GBMs.
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Affiliation(s)
- Maja Žugec
- Laboratory of Neuroendocrinology-Molecular Cell Physiology, Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Borut Furlani
- Laboratory of Neuroendocrinology-Molecular Cell Physiology, Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Maria J Castañon
- Max Perutz Laboratories, Department of Biochemistry and Cell Biology, University of Vienna, Vienna, Austria
| | - Boštjan Rituper
- Laboratory of Neuroendocrinology-Molecular Cell Physiology, Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Irmgard Fischer
- Max Perutz Laboratories, Department of Biochemistry and Cell Biology, University of Vienna, Vienna, Austria
| | - Giuseppe Broggi
- Department of Medical and Surgical Sciences and Advanced Technologies "G.F. Ingrassia", University of Catania, Catania, Italy
| | - Rosario Caltabiano
- Department of Medical and Surgical Sciences and Advanced Technologies "G.F. Ingrassia", University of Catania, Catania, Italy
| | - Giuseppe M V Barbagallo
- Department of Medical and Surgical Sciences and Advanced Technologies "G.F. Ingrassia", University of Catania, Catania, Italy
| | - Michelino Di Rosa
- Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy
| | - Daniele Tibullo
- Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy
| | - Rosalba Parenti
- Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy
| | - Nunzio Vicario
- Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy
| | - Saša Simčič
- Institute of Microbiology and Immunology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Victorio Martin Pozo Devoto
- International Clinical Research Center (ICRC), St. Anne's University Hospital in Brno, 625 00, Brno, Czech Republic
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Gorazd B Stokin
- Institute for Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University Olomouc, Olomouc, Czech Republic
- Department of Neurology, Gloucestershire Royal Hospital, Gloucestershire NHS Foundation Trust, Gloucester, UK
- Celica Biomedical, Ljubljana, Slovenia
| | - Gerhard Wiche
- Max Perutz Laboratories, Department of Biochemistry and Cell Biology, University of Vienna, Vienna, Austria
- Celica Biomedical, Ljubljana, Slovenia
| | - Jernej Jorgačevski
- Laboratory of Neuroendocrinology-Molecular Cell Physiology, Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
- Celica Biomedical, Ljubljana, Slovenia
| | - Robert Zorec
- Laboratory of Neuroendocrinology-Molecular Cell Physiology, Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
- Celica Biomedical, Ljubljana, Slovenia
| | - Maja Potokar
- Laboratory of Neuroendocrinology-Molecular Cell Physiology, Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia.
- Celica Biomedical, Ljubljana, Slovenia.
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Wu J, Li R, Shen Y, Zhang X, Wang X, Wang Z, Zhao Y, Huang L, Zhang L, Zhang B. Candida tropicalis oligopeptide transporters assist in the transmembrane transport of the antimicrobial peptide CGA-N9. Biochem Biophys Res Commun 2023; 649:101-109. [PMID: 36764112 DOI: 10.1016/j.bbrc.2023.01.083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 01/26/2023] [Indexed: 02/05/2023]
Abstract
Candida tropicalis is often reported as the second or third most common pathogen causing fungal infections. Antimicrobial peptides (AMPs) have attracted increasing attention for their broad-spectrum antimicrobial properties and low cytotoxicity. Our previous studies have shown that CGA-N9, a non-membrane-rupturing AMP, crosses the cell membrane to exert anticandidal activity. We speculate that there are some related transporters that assist in the transmembrane transport of CGA-N9. In this study, the relationship between CGA-N9 lethality kinetics and its real-time transmembrane amount in C. tropicalis cells was investigated. The results demonstrated that there was a positive correlation between its candicidal activity and transmembrane amount. A total of 12 oligopeptide transporter (OPT) coding sequences (CDSs) were cloned from C. tropicalis by using the conservative OPT gene sequences of Candida spp. to design primers and were named C. tropicalis OPTs (CtOPTs). The results of RT‒qPCR demonstrated that the expression levels of CtOPT1, CtOPT9 and CtOPT12 were correlated with the CGA-N9 transmembrane amount in a time-dependent manner. The results of molecular docking demonstrated that CtOPT1, CtOPT9 and CtOPT12 interact strongly with CGA-N9. Therefore, CtOPT1, CtOPT9 and CtOPT12 were predicted to assist in the transmembrane transport of the AMP CGA-N9.
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Affiliation(s)
- Jiasha Wu
- College of Biological Engineering, Henan University of Technology, 450001, Zhengzhou, Henan, PR China; Key Laboratory of Functional Molecules for Biomedical Research, Henan University of Technology, 450001, Zhengzhou, Henan, PR China
| | - Ruifang Li
- College of Biological Engineering, Henan University of Technology, 450001, Zhengzhou, Henan, PR China; Key Laboratory of Functional Molecules for Biomedical Research, Henan University of Technology, 450001, Zhengzhou, Henan, PR China.
| | - Yunpeng Shen
- College of Biological Engineering, Henan University of Technology, 450001, Zhengzhou, Henan, PR China; Key Laboratory of Functional Molecules for Biomedical Research, Henan University of Technology, 450001, Zhengzhou, Henan, PR China
| | - Xinhui Zhang
- College of Biological Engineering, Henan University of Technology, 450001, Zhengzhou, Henan, PR China; Key Laboratory of Functional Molecules for Biomedical Research, Henan University of Technology, 450001, Zhengzhou, Henan, PR China
| | - Xueqin Wang
- College of Biological Engineering, Henan University of Technology, 450001, Zhengzhou, Henan, PR China; Key Laboratory of Functional Molecules for Biomedical Research, Henan University of Technology, 450001, Zhengzhou, Henan, PR China
| | - Zichao Wang
- College of Biological Engineering, Henan University of Technology, 450001, Zhengzhou, Henan, PR China; Key Laboratory of Functional Molecules for Biomedical Research, Henan University of Technology, 450001, Zhengzhou, Henan, PR China
| | - Yingyuan Zhao
- College of Biological Engineering, Henan University of Technology, 450001, Zhengzhou, Henan, PR China; Key Laboratory of Functional Molecules for Biomedical Research, Henan University of Technology, 450001, Zhengzhou, Henan, PR China
| | - Liang Huang
- College of Biological Engineering, Henan University of Technology, 450001, Zhengzhou, Henan, PR China; Key Laboratory of Functional Molecules for Biomedical Research, Henan University of Technology, 450001, Zhengzhou, Henan, PR China
| | - Lan Zhang
- College of Biological Engineering, Henan University of Technology, 450001, Zhengzhou, Henan, PR China; Key Laboratory of Functional Molecules for Biomedical Research, Henan University of Technology, 450001, Zhengzhou, Henan, PR China
| | - Beibei Zhang
- College of Biological Engineering, Henan University of Technology, 450001, Zhengzhou, Henan, PR China; Key Laboratory of Functional Molecules for Biomedical Research, Henan University of Technology, 450001, Zhengzhou, Henan, PR China.
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