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Schürz M, Danmayr J, Jaritsch M, Klinglmayr E, Benirschke HM, Matea C, Zimmerebner P, Rauter J, Wolf M, Gomes FG, Kratochvil Z, Heger Z, Miller A, Heuser T, Stanojlovic V, Kiefer J, Plank T, Johnson L, Himly M, Blöchl C, Huber CG, Hintersteiner M, Meisner‐Kober N. EVAnalyzer: High content imaging for rigorous characterisation of single extracellular vesicles using standard laboratory equipment and a new open-source ImageJ/Fiji plugin. J Extracell Vesicles 2022; 11:e12282. [PMID: 36437554 PMCID: PMC9702573 DOI: 10.1002/jev2.12282] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Revised: 11/03/2022] [Accepted: 11/07/2022] [Indexed: 11/30/2022] Open
Abstract
Extracellular vesicle (EV) research increasingly demands for quantitative characterisation at the single vesicle level to address heterogeneity and complexity of EV subpopulations. Emerging, commercialised technologies for single EV analysis based on, for example, imaging flow cytometry or imaging after capture on chips generally require dedicated instrumentation and proprietary software not readily accessible to every lab. This limits their implementation for routine EV characterisation in the rapidly growing EV field. We and others have shown that single vesicles can be detected as light diffraction limited fluorescent spots using standard confocal and widefield fluorescence microscopes. Advancing this simple strategy into a process for routine EV quantitation, we developed 'EVAnalyzer', an ImageJ/Fiji (Fiji is just ImageJ) plugin for automated, quantitative single vesicle analysis from imaging data. Using EVAnalyzer, we established a robust protocol for capture, (immuno-)labelling and fluorescent imaging of EVs. To exemplify the application scope, the process was optimised and systematically tested for (i) quantification of EV subpopulations, (ii) validation of EV labelling reagents, (iii) in situ determination of antibody specificity, sensitivity and species cross-reactivity for EV markers and (iv) optimisation of genetic EV engineering. Additionally, we show that the process can be applied to synthetic nanoparticles, allowing to determine siRNA encapsulation efficiencies of lipid-based nanoparticles (LNPs) and protein loading of SiO2 nanoparticles. EVAnalyzer further provides a pipeline for automated quantification of cell uptake at the single cell-single vesicle level, thereby enabling high content EV cell uptake assays and plate-based screens. Notably, the entire procedure from sample preparation to the final data output is entirely based on standard reagents, materials, laboratory equipment and open access software. In summary, we show that EVAnalyzer enables rigorous characterisation of EVs with generally accessible tools. Since we further provide the plugin as open-source code, we expect EVAnalyzer to not only be a resource of immediate impact, but an open innovation platform for the EV and nanoparticle research communities.
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Affiliation(s)
- Melanie Schürz
- Department of Biosciences and Medical BiologyParis Lodron University SalzburgSalzburgAustria
| | - Joachim Danmayr
- Department of Informatics and MathematicsFernuniversität HagenHagenGermany
| | - Maria Jaritsch
- Department of Biosciences and Medical BiologyParis Lodron University SalzburgSalzburgAustria
| | - Eva Klinglmayr
- Department of Biosciences and Medical BiologyParis Lodron University SalzburgSalzburgAustria
| | - Heloisa Melo Benirschke
- Department of Biosciences and Medical BiologyParis Lodron University SalzburgSalzburgAustria
| | - Cristian‐Tudor Matea
- Department of Biosciences and Medical BiologyParis Lodron University SalzburgSalzburgAustria
| | - Patrick Zimmerebner
- Department of Biosciences and Medical BiologyParis Lodron University SalzburgSalzburgAustria
| | - Jakob Rauter
- Department of Biosciences and Medical BiologyParis Lodron University SalzburgSalzburgAustria
| | - Martin Wolf
- Cell Therapy Institute, Spinal Cord Injury and Tissue Regeneration Centre Salzburg (SCI‐TReCS)Paracelsus Medical University (PMU)SalzburgAustria
| | - Fausto Gueths Gomes
- Cell Therapy Institute, Spinal Cord Injury and Tissue Regeneration Centre Salzburg (SCI‐TReCS)Paracelsus Medical University (PMU)SalzburgAustria
| | - Zdenek Kratochvil
- Department of Chemistry and BiochemistryMendel University in BrnoBrnoCzech Republic
| | - Zbynek Heger
- Department of Chemistry and BiochemistryMendel University in BrnoBrnoCzech Republic
| | - Andrew Miller
- Department of Chemistry and BiochemistryMendel University in BrnoBrnoCzech Republic
- Veterinary Research InstituteBrnoCzech Republic
- KP Therapeutics (Europe) sro.BrnoCzech Republic
| | | | - Vesna Stanojlovic
- Department of Biosciences and Medical BiologyParis Lodron University SalzburgSalzburgAustria
| | - Jana Kiefer
- Department of Biosciences and Medical BiologyParis Lodron University SalzburgSalzburgAustria
| | - Tanja Plank
- Department of Biosciences and Medical BiologyParis Lodron University SalzburgSalzburgAustria
| | - Litty Johnson
- Department of Biosciences and Medical BiologyParis Lodron University SalzburgSalzburgAustria
| | - Martin Himly
- Department of Biosciences and Medical BiologyParis Lodron University SalzburgSalzburgAustria
| | - Constantin Blöchl
- Department of Biosciences and Medical BiologyParis Lodron University SalzburgSalzburgAustria
| | - Christian G. Huber
- Department of Biosciences and Medical BiologyParis Lodron University SalzburgSalzburgAustria
| | | | - Nicole Meisner‐Kober
- Department of Biosciences and Medical BiologyParis Lodron University SalzburgSalzburgAustria
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Yang M, Guo X, Chen T, Li P, Xiao T, Dai Z, Hu Y. Effect of dietary replacement of fish meal by poultry by-product meal on the growth performance, immunity, and intestinal health of juvenile red swamp crayfish, procambarus clarkia. FISH & SHELLFISH IMMUNOLOGY 2022; 131:381-390. [PMID: 36257552 DOI: 10.1016/j.fsi.2022.10.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Revised: 10/05/2022] [Accepted: 10/12/2022] [Indexed: 06/16/2023]
Abstract
The present study was conducted to investigate the dietary replacement of fish meal with poultry by-product meal (PBM) on the growth performance, immunity, antioxidant properties, and intestinal health of red swamp crayfish (Procambarus clarkia). A diet containing 20% fish meal (FM) and complex plant ingredients as the main protein resources was set as the FM group (crude protein 32%, crude lipid 6%). Four diets replacing 25%, 50%, 75%, and 100% fish meal of the FM diet with PBM were set as the PBM25, PBM50, PBM75, and PBM100 groups, respectively. Compared to the FM group, the PBM100 diet significantly decreased growth performance and feed utilization of crayfish, while markedly increasing the activity of serum aspartate aminotransferase. The immune response was depressed in crayfish fed the PBM100 diet as the activities of serum lysozyme and phenoloxidase, gene expression of anti-lipopolysaccharide factors (alf), cyclophilin A (cypa), crustin, and hemocyanin-1 (hep-1) in hepatopancreas were remarkably decreased. The activities of antioxidases and expression of antioxidant-relevant genes in the hepatopancreas were not influenced by PBM inclusion. Crayfish fed different diets exhibited no obvious symptoms of enteritis, but the PBM100 diet destructed intestinal morphology by significantly decreasing the average length of longitudinal ridges. The α-diversity and overall community structure were not significantly influenced but variations were found in the relative abundance of some genera by PBM inclusion. In summary, CAP could successfully replace 75% dietary FM in a basal diet containing 20% fish meal, while higher CAP level compromised growth performance, immunity, and intestinal histology of crayfish.
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Affiliation(s)
- Mengxi Yang
- Hunan Engineering Technology Research Center of Featured Aquatic Resources Utilization, College of Animal Science and Technology, Hunan Agricultural University, 1 Nongda Road, Changsha, 410128, Hunan, China
| | - Xiaorui Guo
- Hunan Engineering Technology Research Center of Featured Aquatic Resources Utilization, College of Animal Science and Technology, Hunan Agricultural University, 1 Nongda Road, Changsha, 410128, Hunan, China
| | - Tuo Chen
- Hunan Engineering Technology Research Center of Featured Aquatic Resources Utilization, College of Animal Science and Technology, Hunan Agricultural University, 1 Nongda Road, Changsha, 410128, Hunan, China
| | - Peng Li
- North American Renderers Association, Alexandria, VA, 22314, USA
| | - Tiaoyi Xiao
- Hunan Engineering Technology Research Center of Featured Aquatic Resources Utilization, College of Animal Science and Technology, Hunan Agricultural University, 1 Nongda Road, Changsha, 410128, Hunan, China
| | - Zhenyan Dai
- Hunan Engineering Technology Research Center of Featured Aquatic Resources Utilization, College of Animal Science and Technology, Hunan Agricultural University, 1 Nongda Road, Changsha, 410128, Hunan, China
| | - Yi Hu
- Hunan Engineering Technology Research Center of Featured Aquatic Resources Utilization, College of Animal Science and Technology, Hunan Agricultural University, 1 Nongda Road, Changsha, 410128, Hunan, China.
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Sanguankiattichai N, Buscaill P, Preston GM. How bacteria overcome flagellin pattern recognition in plants. CURRENT OPINION IN PLANT BIOLOGY 2022; 67:102224. [PMID: 35533494 DOI: 10.1016/j.pbi.2022.102224] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 03/03/2022] [Accepted: 03/29/2022] [Indexed: 06/14/2023]
Abstract
Efficient plant immune responses depend on the ability to recognise an invading microbe. The 22-amino acids in the N-terminal domain and the 28-amino acids in the central region of the bacterial flagellin, called flg22 and flgII-28, respectively, are important elicitors of plant immunity. Plant immunity is activated after flg22 or flgII-28 recognition by the plant transmembrane receptors FLS2 or FLS3, respectively. There is strong selective pressure on many plant pathogenic and endophytic bacteria to overcome flagellin-triggered immunity. Here we provide an overview of recent developments in our understanding of the evasion and suppression of flagellin pattern recognition by plant-associated bacteria.
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Affiliation(s)
| | - Pierre Buscaill
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK
| | - Gail M Preston
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK.
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Ramírez-Larrota JS, Eckhard U. An Introduction to Bacterial Biofilms and Their Proteases, and Their Roles in Host Infection and Immune Evasion. Biomolecules 2022; 12:306. [PMID: 35204806 PMCID: PMC8869686 DOI: 10.3390/biom12020306] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 02/03/2022] [Accepted: 02/10/2022] [Indexed: 12/15/2022] Open
Abstract
Bacterial biofilms represent multicellular communities embedded in a matrix of extracellular polymeric substances, conveying increased resistance against environmental stress factors but also antibiotics. They are shaped by secreted enzymes such as proteases, which can aid pathogenicity by degrading host proteins of the connective tissue or the immune system. Importantly, both secreted proteases and the capability of biofilm formation are considered key virulence factors. In this review, we focus on the basic aspects of proteolysis and protein secretion, and highlight various secreted bacterial proteases involved in biofilm establishment and dispersal, and how they aid bacteria in immune evasion by degrading immunoglobulins and components of the complement system. Thus, secreted proteases represent not only prominent antimicrobial targets but also enzymes that can be used for dedicated applications in biotechnology and biomedicine, including their use as laundry detergents, in mass spectrometry for the glycoprofiling of antibodies, and the desensitization of donor organs intended for positive crossmatch patients.
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Affiliation(s)
| | - Ulrich Eckhard
- Department of Structural Biology, Molecular Biology Institute of Barcelona, CSIC, Barcelona Science Park, Baldiri Reixac, 15-21, 08028 Barcelona, Spain;
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Proteolytic Profiling of Streptococcal Pyrogenic Exotoxin B (SpeB) by Complementary HPLC-MS Approaches. Int J Mol Sci 2021; 23:ijms23010412. [PMID: 35008838 PMCID: PMC8745752 DOI: 10.3390/ijms23010412] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 12/27/2021] [Accepted: 12/29/2021] [Indexed: 01/25/2023] Open
Abstract
Streptococcal pyrogenic exotoxin B (SpeB) is a cysteine protease expressed during group A streptococcal infection that represents a major virulence factor. Although subject to several studies, its role during infection is still under debate, and its proteolytic properties remain insufficiently characterized. Here, we revisited this protease through a set of complementary approaches relying on state of-the-art HPLC-MS methods. After conceiving an efficient protocol to recombinantly express SpeB, the zymogen of the protease and its activation were characterized. Employing proteome-derived peptide libraries, a strong preference for hydrophobic and aromatic residues at P2 alongside negatively charged amino acids at P3′ to P6′ was revealed. To identify relevant in vivo substrates, native proteins were obtained from monocytic secretome and plasma to assess their cleavage under physiological conditions. Besides corroborating our findings concerning specificity, more than 200 cleaved proteins were identified, including proteins of the extracellular matrix, proteins of the immune system, and proteins involved in inflammation. Finally, the cleavage of IgG subclasses was studied in detail. This study precisely depicts the proteolytic properties of SpeB and provides a library of potential host substrates, including their exact cleavage positions, as a valuable source for further research to unravel the role of SpeB during streptococcal infection.
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