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Fetz AE, King WE, Minden-Birkenmaier BA, Bowlin GL. Methods for Quantifying Neutrophil Extracellular Traps on Biomaterials. Methods Mol Biol 2022; 2394:727-742. [PMID: 35094355 DOI: 10.1007/978-1-0716-1811-0_38] [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] [Indexed: 06/14/2023]
Abstract
Neutrophils rapidly accumulate at sites of inflammation, including biomaterial implantation sites, where they can modulate the microenvironment toward repair through a variety of functions, including superoxide generation, granule release, and extrusion of neutrophil extracellular traps (NETs). NETs are becoming increasing implicated as a central player in the host response to a biomaterial, and as such, there is a need for reliable in vitro methods to evaluate the relative degree of NETs and quantify NETs on the surface of biomaterials. Such methods should be relatively high throughput and minimize sampling bias. In this chapter, we describe two procedures, (1) fluorescent image analysis and (2) a NETs-based ELISA, both of which have been specifically optimized to quantify NETs generated from human neutrophils on electrospun polydioxanone templates. Both methods are valid and also compatible with tissue culture plastic, but have a variety of advantages and disadvantages. Therefore, both methods can be used to concomitantly study NETs on the surface of a biomaterial. Finally, while these methods were developed for electrospun templates in a 96-well cell culture plate, they may be easily adapted to a large scale and for other biomaterials, including but not limited to metallics, ceramics, and natural and synthetic polymers.
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Affiliation(s)
- Allison E Fetz
- Department of Biomedical Engineering, University of Memphis, Memphis, TN, USA
| | - William E King
- Department of Biomedical Engineering, University of Memphis, Memphis, TN, USA
- Department of Orthopedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN, USA
| | | | - Gary L Bowlin
- Department of Biomedical Engineering, University of Memphis, Memphis, TN, USA.
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Sclerotium rolfsii lectin induces opposite effects on normal PBMCs and leukemic Molt-4 cells by recognising TF antigen and its variants as receptors. Glycoconj J 2020; 37:251-261. [PMID: 31900725 DOI: 10.1007/s10719-019-09905-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 11/13/2019] [Accepted: 12/20/2019] [Indexed: 01/02/2023]
Abstract
Sclerotium rolfsii lectin (SRL) exerts apoptotic effect against various cancer cells and an antitumor activity on mice with colon and breast cancer xenografts. The current study aimed to explore its exquisite carbohydrate specificity on human peripheral blood mononuclear cells (PBMCs) and leukemic T-cells. SRL, showed strong binding (>98%) to resting/activated PBMCs, leukemic Molt-4 and Jurkat cell lines. The glycans mediated binding to these cells was effectively blocked by mucin and fetuin, exhibiting 97% and 94% inhibition respectively. SRL showed mitogenic stimulation of PBMCs at 10 μg/ml as determined by thymidine incorporation assay. In contrast, lectin induced a dose dependent growth inhibition of Molt-4 cells with 58% inhibition at 25 μg/ml. Many common membrane receptors in activated PBMCs, Molt 4 and Jurkat cells were identified by lectin blotting. However, membrane receptors that are recognized by SRL in normal resting PBMCs were totally different and are high molecular weight glycoproteins. Treatment of membrane receptors with glycosidases prior to lectin probing, revealed that fucosylated Thomsen-Friedenreich(TF) antigen glycans are increasingly expressed on transformed Molt-4 leukemic cells compared to other cells. The findings highlight the opposite effects of SRL on transformed and normal hematopoietic cells by recognizing different glycan-receptors. SRL has promising potential for diagnostics and therapeutic applications in leukaemia.
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de Wit S, Zeune LL, Hiltermann TJN, Groen HJM, Dalum GV, Terstappen LWMM. Classification of Cells in CTC-Enriched Samples by Advanced Image Analysis. Cancers (Basel) 2018; 10:cancers10100377. [PMID: 30308977 PMCID: PMC6210778 DOI: 10.3390/cancers10100377] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Revised: 10/05/2018] [Accepted: 10/08/2018] [Indexed: 02/05/2023] Open
Abstract
In the CellSearch® system, blood is immunomagnetically enriched for epithelial cell adhesion molecule (EpCAM) expression and cells are stained with the nucleic acid dye 4′6-diamidino-2-phenylindole (DAPI), Cytokeratin-PE (CK), and CD45-APC. Only DAPI+/CK+ objects are presented to the operator to identify circulating tumor cells (CTC) and the identity of all other cells and potential undetected CTC remains unrevealed. Here, we used the open source imaging program Automatic CTC Classification, Enumeration and PhenoTyping (ACCEPT) to analyze all DAPI+ nuclei in EpCAM-enriched blood samples obtained from 192 metastatic non-small cell lung cancer (NSCLC) patients and 162 controls. Significantly larger numbers of nuclei were detected in 300 patient samples with an average and standard deviation of 73,570 ± 74,948, as compared to 359 control samples with an average and standard deviation of 4191 ± 4463 (p < 0.001). In patients, only 18% ± 21% and in controls 23% ± 15% of the nuclei were identified as leukocytes or CTC. Adding CD16-PerCP for granulocyte staining, the use of an LED as the light source for CD45-APC excitation and plasma membrane staining obtained with wheat germ agglutinin significantly improved the classification of EpCAM-enriched cells, resulting in the identification of 94% ± 5% of the cells. However, especially in patients, the origin of the unidentified cells remains unknown. Further studies are needed to determine if undetected EpCAM+/DAPI+/CK-/CD45- CTC is present among these cells.
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Affiliation(s)
- Sanne de Wit
- Department of Medical Cell BioPhysics, University of Twente, 7522 NH Enschede, The Netherlands.
| | - Leonie L Zeune
- Department of Medical Cell BioPhysics, University of Twente, 7522 NH Enschede, The Netherlands.
- Department of Applied Mathematics, University of Twente, 7522 NH Enschede, The Netherlands.
| | - T Jeroen N Hiltermann
- Department of Pulmonary Diseases, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands.
| | - Harry J M Groen
- Department of Pulmonary Diseases, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands.
| | - Guus van Dalum
- Department of General, Visceral and Pediatric Surgery, University Hospital of the Heinrich-Heine-University Düsseldorf, 40225 Düsseldorf, Germany.
| | - Leon W M M Terstappen
- Department of Medical Cell BioPhysics, University of Twente, 7522 NH Enschede, The Netherlands.
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Baiula M, Galletti P, Martelli G, Soldati R, Belvisi L, Civera M, Dattoli SD, Spampinato SM, Giacomini D. New β-Lactam Derivatives Modulate Cell Adhesion and Signaling Mediated by RGD-Binding and Leukocyte Integrins. J Med Chem 2016; 59:9721-9742. [PMID: 27726366 DOI: 10.1021/acs.jmedchem.6b00576] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A novel series of β-lactam derivatives that was designed and synthesized to target RGD-binding and leukocyte integrins is reported. The compound library was evaluated by investigating the effects on integrin-mediated cell adhesion and cell signaling in cell lines expressing αvβ3, αvβ5, αvβ6, α5β1, αIIbβ3, α4β1, and αLβ2 integrins. SAR analysis of the new series of azetidinones enabled the recognition of structural elements associated with integrin selectivity. We obtained selective and potent agonists that could induce cell adhesion and promote cell signaling mediated by αvβ3, αvβ5, α5β1, or α4β1 integrin, and antagonists for the integrins αvβ3 and α5β1, as well as α4β1 and αLβ2, preventing the effects elicited by the respective endogenous agonists.
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Affiliation(s)
- Monica Baiula
- Department of Pharmacy and Biotechnology, University of Bologna , Via Irnerio 48, 40126, Bologna, Italy
| | - Paola Galletti
- Department of Chemistry "G. Ciamician", University of Bologna , Via Selmi 2, 40126 Bologna, Italy
| | - Giulia Martelli
- Department of Chemistry "G. Ciamician", University of Bologna , Via Selmi 2, 40126 Bologna, Italy
| | - Roberto Soldati
- Department of Chemistry "G. Ciamician", University of Bologna , Via Selmi 2, 40126 Bologna, Italy
| | - Laura Belvisi
- Department of Chemistry, University of Milan , Via Golgi 19, 20133 Milan, Italy
| | - Monica Civera
- Department of Chemistry, University of Milan , Via Golgi 19, 20133 Milan, Italy
| | - Samantha Deianira Dattoli
- Department of Pharmacy and Biotechnology, University of Bologna , Via Irnerio 48, 40126, Bologna, Italy
| | - Santi Mario Spampinato
- Department of Pharmacy and Biotechnology, University of Bologna , Via Irnerio 48, 40126, Bologna, Italy
| | - Daria Giacomini
- Department of Chemistry "G. Ciamician", University of Bologna , Via Selmi 2, 40126 Bologna, Italy
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Dattoli SD, De Marco R, Baiula M, Spampinato S, Greco A, Tolomelli A, Gentilucci L. Synthesis and assay of retro-α4β1 integrin-targeting motifs. Eur J Med Chem 2013; 73:225-32. [PMID: 24412498 DOI: 10.1016/j.ejmech.2013.12.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Revised: 12/05/2013] [Accepted: 12/06/2013] [Indexed: 10/25/2022]
Abstract
In recent years, several research groups proposed new peptidomimetic antagonists of integrins αvβ3, α5β1, αIIbβ3, αvβ6, αvβ5, etc. based on retro sequences of the classic integrin-binding motif RGD. The retro strategy is still largely ignored for the non-RGD-binding α4β1 integrin. Herein we present the first examples of retro sequences for targeting this integrin, composed of Asp or isoAsp equipped with an aromatic cap at the N-terminus, (S)-pyrrolidine-3-carboxylic acid (β(2)-Pro) as a constrained core, and the amino variant (AMPUMP) of the well-known α4-targeting diphenylurea MPUPA. We discuss α4β1 receptor affinity (SPA), cell adhesion assays, stability in mouse serum, and conformational analysis. For their significant ability to inhibit cell adhesion and remarkable stability, the retro-peptide mimetics BnCO-Asp-β-Pro-AMPUMP (3) and BnCO-isoAsp-β-Pro-AMPUMP (4) represent promising candidates for designing small molecules as potential anti-inflammatory agents.
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Affiliation(s)
- Samantha D Dattoli
- Dept. of Pharmacy and BioTechnology, University of Bologna, via Irnerio 48, 40126 Bologna, Italy
| | - Rossella De Marco
- Dept. of Chemistry "G. Ciamician", University of Bologna, via Selmi 2, 40126 Bologna, Italy.
| | - Monica Baiula
- Dept. of Pharmacy and BioTechnology, University of Bologna, via Irnerio 48, 40126 Bologna, Italy
| | - Santi Spampinato
- Dept. of Pharmacy and BioTechnology, University of Bologna, via Irnerio 48, 40126 Bologna, Italy.
| | - Arianna Greco
- Dept. of Chemistry "G. Ciamician", University of Bologna, via Selmi 2, 40126 Bologna, Italy
| | - Alessandra Tolomelli
- Dept. of Chemistry "G. Ciamician", University of Bologna, via Selmi 2, 40126 Bologna, Italy
| | - Luca Gentilucci
- Dept. of Chemistry "G. Ciamician", University of Bologna, via Selmi 2, 40126 Bologna, Italy.
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Qasem AR, Bucolo C, Baiula M, Spartà A, Govoni P, Bedini A, Fascì D, Spampinato S. Contribution of alpha4beta1 integrin to the antiallergic effect of levocabastine. Biochem Pharmacol 2008; 76:751-62. [PMID: 18680729 DOI: 10.1016/j.bcp.2008.07.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2008] [Revised: 07/07/2008] [Accepted: 07/08/2008] [Indexed: 11/30/2022]
Abstract
Levocabastine is an antiallergic drug acting as a histamine H1-receptor antagonist. In allergic conjunctivitis (AC), it may also antagonize up-regulation of the intercellular adhesion molecule-1 (ICAM-1) expressed on epithelial conjunctival cells. However, little is known about its effects on eosinophils, important effector cells in AC. The adhesion molecule integrin alpha(4)beta(1) is expressed in eosinophils; it interacts with the vascular cell adhesion molecule-1 (VCAM-1) and fibronectin (FN) in vascular endothelial cells and contributes to eosinophil activation and infiltration in AC. This study provides evidence that in a scintillation proximity assay levocabastine (IC(50) 406 microM), but not the first-generation antihistamine chlorpheniramine, displaced (125)I-FN binding to human integrin alpha(4)beta(1) and, in flow cytometry analysis, levocabastine antagonized the binding of a primary antibody to integrin alpha(4) expressed on the Jurkat cell surface. Levocabastine, but not chlorpheniramine, binds the alpha(4)beta(1) integrin and prevents eosinophil adhesion to VCAM-1, FN or human umbilical vascular endothelial cells (HUVEC) in vitro. Similarly, levocabastine affects alpha(L)beta(2)/ICAM-1-mediated adhesion of Jurkat cells. In a model of AC levocabastine eye drops reduced the clinical aspects of the late-phase reaction and the conjunctival expression of alpha(4)beta(1) integrin by reducing infiltrated eosinophils. We propose that blockade of integrin-mediated cell adhesion might be a target of the antiallergic action of levocabastine and may play a role in preventing eosinophil adhesion and infiltration in AC.
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Affiliation(s)
- Ahmed R Qasem
- Department of Medicine, Health Science Campus, University of Toledo, OH, USA
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