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Aberrant Sialylation in Cancer: Therapeutic Opportunities. Cancers (Basel) 2022; 14:cancers14174248. [PMID: 36077781 PMCID: PMC9454432 DOI: 10.3390/cancers14174248] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 08/15/2022] [Accepted: 08/23/2022] [Indexed: 11/16/2022] Open
Abstract
The surface of every eukaryotic cell is coated in a thick layer of glycans that acts as a key interface with the extracellular environment. Cancer cells have a different ‘glycan coat’ to healthy cells and aberrant glycosylation is a universal feature of cancer cells linked to all of the cancer hallmarks. This means glycans hold huge potential for the development of new diagnostic and therapeutic strategies. One key change in tumour glycosylation is increased sialylation, both on N-glycans and O-glycans, which leads to a dense forest of sialylated structures covering the cell surface. This hypersialylation has far-reaching consequences for cancer cells, and sialylated glycans are fundamental in tumour growth, metastasis, immune evasion and drug resistance. The development of strategies to inhibit aberrant sialylation in cancer represents an important opportunity to develop new therapeutics. Here, I summarise recent advances to target aberrant sialylation in cancer, including the development of sialyltransferase inhibitors and strategies to inhibit Siglecs and Selectins, and discuss opportunities for the future.
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Dobie C, Skropeta D. Insights into the role of sialylation in cancer progression and metastasis. Br J Cancer 2020; 124:76-90. [PMID: 33144696 PMCID: PMC7782833 DOI: 10.1038/s41416-020-01126-7] [Citation(s) in RCA: 148] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 09/11/2020] [Accepted: 10/08/2020] [Indexed: 02/07/2023] Open
Abstract
Upregulation of sialyltransferases—the enzymes responsible for the addition of sialic acid to growing glycoconjugate chains—and the resultant hypersialylation of up to 40–60% of tumour cell surfaces are established hallmarks of several cancers, including lung, breast, ovarian, pancreatic and prostate cancer. Hypersialylation promotes tumour metastasis by several routes, including enhancing immune evasion and tumour cell survival, and stimulating tumour invasion and migration. The critical role of enzymes that regulate sialic acid in tumour cell growth and metastasis points towards targeting sialylation as a potential new anti-metastatic cancer treatment strategy. Herein, we explore insights into the mechanisms by which hypersialylation plays a role in promoting metastasis, and explore the current state of sialyltransferase inhibitor development.
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Affiliation(s)
- Christopher Dobie
- School of Chemistry & Molecular Bioscience, Faculty of Science, Medicine & Health; and Molecular Horizons, University of Wollongong, NSW, 2522, Wollongong, Australia
| | - Danielle Skropeta
- School of Chemistry & Molecular Bioscience, Faculty of Science, Medicine & Health; and Molecular Horizons, University of Wollongong, NSW, 2522, Wollongong, Australia. .,Illawarra Health & Medical Research Institute, Wollongong, NSW, 2522, Australia.
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Pharmaceutical Development and Safety Evaluation of a GMP-Grade Fucoidan for Molecular Diagnosis of Cardiovascular Diseases. Mar Drugs 2019; 17:md17120699. [PMID: 31842319 PMCID: PMC6949921 DOI: 10.3390/md17120699] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 12/04/2019] [Accepted: 12/09/2019] [Indexed: 12/21/2022] Open
Abstract
The adhesion molecule P-selectin is present on the cell surface of both activated endothelium and activated platelets. The present study describes the pharmaceutical development, safety evaluation, and preclinical efficacy of a micro-dosed radiotracer. The macromolecular nanoscale assembly consisted of a natural compound made of a sulfated fucose-rich polysaccharides (fucoidan) and a radionuclide (technetium-99m) for the detection of P-selectin expression in cardiovascular diseases. After extraction and fractionation from brown seaweeds, the good manufacturing practice (GMP) production of a low molecular weight (LMW) fucoidan of 7 kDa was achieved and full physicochemical characterization was performed. The regulatory toxicology study in rats of the GMP batch of LMW fucoidan revealed no adverse effects up to 400 μg/kg (×500 higher than the expected human dose) and pseudoallergy was not seen as well. In a myocardial ischemia-reperfusion model in rats, the GMP-grade LMW fucoidan labeled with technetium-99m detected P-selectin upregulation in vivo. The present study supports the potential of using 99mTc-fucoidan as an imaging agent to detect activated endothelium in humans.
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Takeshita K, Susuki C, Itoh S, Tsuji T. Preventive Effect of α-Tocopherol and Glycyrrhizin against Platelet-Neutrophil Complex Formation Induced by Hemodialysis Membranes. Int J Artif Organs 2018; 32:282-90. [DOI: 10.1177/039139880903200505] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Background The intradialytic activation of leukocytes is a major cause of hemodialysis (HD)-associated complications. Contact between blood and HD membranes frequently induces the formation of microaggregates composed of activated platelets and leukocytes, causing leukocyte activation that includes the generation of reactive oxygen species (ROS). This complex formation is mediated primarily by the interaction between P-selectin on activated platelets and its counter-ligands on leukocytes. Objective We examined the preventive effects of α-tocopherol and glycyrrhizin in vitro against platelet-neutrophil microaggregate formation and neutrophil ROS production induced by HD membranes. Methods and Results Microaggregate formation induced by the incubation of heparinized whole blood with polysulfone (PS) HD membranes was effectively inhibited by α-tocopherol and glycyrrhizin. α-Tocopherol, but not glycyrrhizin, was found to inhibit PS membrane-induced P-selectin expression on the platelet surface; however, glycyrrhizin did inhibit both the formation of neutrophil-platelet microaggregates induced by adenosine diphosphate (ADP) and the adhesion of HL60 leukemic cells to P-selectin-expressing Chinese hamster ovary (CHO) cells, suggesting that glycyrrhizin acts as a competitive inhibitor of P-selectin-mediated cell adhesion. Finally, these compounds almost completely abrogated PS membrane-induced and platelet-dependent ROS production by neutrophils. Conclusions These results suggest that α-tocopherol and glycyrrhizin may function as preventive agents of HD-associated leukocyte activation though the modulation of platelet-leukocyte interaction.
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Affiliation(s)
- Kana Takeshita
- Department of Microbiology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Tokyo - Japan
| | - Chie Susuki
- Department of Microbiology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Tokyo - Japan
| | - Saotomo Itoh
- Department of Microbiology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Tokyo - Japan
| | - Tsutomu Tsuji
- Department of Microbiology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Tokyo - Japan
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5
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Chantarasrivong C, Ueki A, Ohyama R, Unga J, Nakamura S, Nakanishi I, Higuchi Y, Kawakami S, Ando H, Imamura A, Ishida H, Yamashita F, Kiso M, Hashida M. Synthesis and Functional Characterization of Novel Sialyl LewisX Mimic-Decorated Liposomes for E-selectin-Mediated Targeting to Inflamed Endothelial Cells. Mol Pharm 2017; 14:1528-1537. [DOI: 10.1021/acs.molpharmaceut.6b00982] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Chanikarn Chantarasrivong
- Department of Drug Delivery Research, Graduate School of Pharmaceutical
Sciences, Kyoto University, 46-29 Yoshidashimoadachi-cho, Sakyo-ku, Kyoto 606-8302, Japan
| | - Akiharu Ueki
- Department of Applied Bioorganic Chemistry, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
- Institute for Integrated
Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshidaushinomiya-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Ryutaro Ohyama
- Department of Applied Bioorganic Chemistry, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
| | - Johan Unga
- Department of Drug Delivery Research, Graduate School of Pharmaceutical
Sciences, Kyoto University, 46-29 Yoshidashimoadachi-cho, Sakyo-ku, Kyoto 606-8302, Japan
| | - Shinya Nakamura
- Department of Pharmaceutical Sciences,
Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae,
Higashi-Osaka, Osaka 577-8502, Japan
| | - Isao Nakanishi
- Department of Pharmaceutical Sciences,
Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae,
Higashi-Osaka, Osaka 577-8502, Japan
| | - Yuriko Higuchi
- Department of Drug Delivery Research, Graduate School of Pharmaceutical
Sciences, Kyoto University, 46-29 Yoshidashimoadachi-cho, Sakyo-ku, Kyoto 606-8302, Japan
| | - Shigeru Kawakami
- Department of Drug Delivery Research, Graduate School of Pharmaceutical
Sciences, Kyoto University, 46-29 Yoshidashimoadachi-cho, Sakyo-ku, Kyoto 606-8302, Japan
| | - Hiromune Ando
- Department of Applied Bioorganic Chemistry, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
- Institute for Integrated
Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshidaushinomiya-cho, Sakyo-ku, Kyoto 606-8501, Japan
- Gifu Center for Highly Advanced Integration
of Nano and Life Sciences (G-CHAIN), Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
| | - Akihiro Imamura
- Department of Applied Bioorganic Chemistry, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
| | - Hideharu Ishida
- Department of Applied Bioorganic Chemistry, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
- Gifu Center for Highly Advanced Integration
of Nano and Life Sciences (G-CHAIN), Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
| | - Fumiyoshi Yamashita
- Department of Drug Delivery Research, Graduate School of Pharmaceutical
Sciences, Kyoto University, 46-29 Yoshidashimoadachi-cho, Sakyo-ku, Kyoto 606-8302, Japan
| | - Makoto Kiso
- Department of Applied Bioorganic Chemistry, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
- Institute for Integrated
Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshidaushinomiya-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Mitsuru Hashida
- Department of Drug Delivery Research, Graduate School of Pharmaceutical
Sciences, Kyoto University, 46-29 Yoshidashimoadachi-cho, Sakyo-ku, Kyoto 606-8302, Japan
- Institute for Integrated
Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshidaushinomiya-cho, Sakyo-ku, Kyoto 606-8501, Japan
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Structural characterization and anti-inflammatory activity of two novel polysaccharides from the sea squirt, Ascidiella aspersa. Pulm Pharmacol Ther 2016; 40:69-79. [DOI: 10.1016/j.pupt.2016.05.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 05/10/2016] [Accepted: 05/11/2016] [Indexed: 01/18/2023]
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Cagnoni AJ, Pérez Sáez JM, Rabinovich GA, Mariño KV. Turning-Off Signaling by Siglecs, Selectins, and Galectins: Chemical Inhibition of Glycan-Dependent Interactions in Cancer. Front Oncol 2016; 6:109. [PMID: 27242953 PMCID: PMC4865499 DOI: 10.3389/fonc.2016.00109] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 04/18/2016] [Indexed: 12/25/2022] Open
Abstract
Aberrant glycosylation, a common feature associated with malignancy, has been implicated in important events during cancer progression. Our understanding of the role of glycans in cancer has grown exponentially in the last few years, concurrent with important advances in glycomics and glycoproteomic technologies, paving the way for the validation of a number of glycan structures as potential glycobiomarkers. However, the molecular bases underlying cancer-associated glycan modifications are still far from understood. Glycans exhibit a natural heterogeneity, crucial for their diverse functional roles as specific carriers of biologically relevant information. This information is decoded by families of proteins named lectins, including sialic acid-binding immunoglobulin (Ig)-like lectins (siglecs), C-type lectin receptors (CLRs), and galectins. Siglecs are primarily expressed on the surface of immune cells and differentially control innate and adaptive immune responses. Among CLRs, selectins are a family of cell adhesion molecules that mediate interactions between cancer cells and platelets, leukocytes, and endothelial cells, thus facilitating tumor cell invasion and metastasis. Galectins, a family of soluble proteins that bind β-galactoside-containing glycans, have been implicated in diverse events associated with cancer biology such as apoptosis, homotypic cell aggregation, angiogenesis, cell migration, and tumor-immune escape. Consequently, individual members of these lectin families have become promising targets for the design of novel anticancer therapies. During the past decade, a number of inhibitors of lectin–glycan interactions have been developed including small-molecule inhibitors, multivalent saccharide ligands, and more recently peptides and peptidomimetics have offered alternatives for tackling tumor progression. In this article, we review the current status of the discovery and development of chemical lectin inhibitors and discuss novel strategies to limit cancer progression by targeting lectin–glycan interactions.
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Affiliation(s)
- Alejandro J Cagnoni
- Laboratorio de Glicómica Funcional y Molecular, Instituto de Biología y Medicina Experimental (IBYME), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina; Laboratorio de Inmunopatología, Instituto de Biología y Medicina Experimental (IBYME), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Juan M Pérez Sáez
- Laboratorio de Inmunopatología, Instituto de Biología y Medicina Experimental (IBYME), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) , Buenos Aires , Argentina
| | - Gabriel A Rabinovich
- Laboratorio de Inmunopatología, Instituto de Biología y Medicina Experimental (IBYME), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina; Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Karina V Mariño
- Laboratorio de Glicómica Funcional y Molecular, Instituto de Biología y Medicina Experimental (IBYME), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) , Buenos Aires , Argentina
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Rachel H, Chang-Chun L. Recent advances toward the development of inhibitors to attenuate tumor metastasis via the interruption of lectin-ligand interactions. Adv Carbohydr Chem Biochem 2014; 69:125-207. [PMID: 24274369 DOI: 10.1016/b978-0-12-408093-5.00005-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Aberrant glycosylation is a well-recognized phenomenon that occurs on the surface of tumor cells, and the overexpression of a number of ligands (such as TF, sialyl Tn, and sialyl Lewis X) has been correlated to a worse prognosis for the patient. These unique carbohydrate structures play an integral role in cell-cell communication and have also been associated with more metastatic cancer phenotypes, which can result from binding to lectins present on cell surfaces. The most well studied metastasis-associated lectins are the galectins and selectins, which have been correlated to adhesion, neoangiogenesis, and immune-cell evasion processes. In order to slow the rate of metastatic lesion formation, a number of approaches have been successfully developed which involve interfering with the tumor lectin-substrate binding event. Through the generation of inhibitors, or by attenuating lectin and/or carbohydrate expression, promising results have been observed both in vitro and in vivo. This article briefly summarizes the involvement of lectins in the metastatic process and also describes different approaches used to prevent these undesirable carbohydrate-lectin binding events, which should ultimately lead to improvement in current cancer therapies.
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Affiliation(s)
- Hevey Rachel
- Alberta Glycomics Centre, Department of Chemistry, University of Calgary, Calgary, Alberta, Canada
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9
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Itoh S, Kawano K, Takeshita K, Maitani Y, Tsuji T. Development of liposomal nanoconstructs targeting P-selectin (CD62P)-expressing cells by using a sulfated derivative of sialic acid. Pharm Res 2014; 31:2868-75. [PMID: 24792831 DOI: 10.1007/s11095-014-1383-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Accepted: 04/07/2014] [Indexed: 12/22/2022]
Abstract
PURPOSE NMSO3, a sulfated derivative of sialic acid, is a specific inhibitor for P-selectin (CD62P)-mediated cell adhesion. We attempted to apply liposomes modified with NMSO3 for selective targeting of activated platelets. METHODS The binding of fluorescently labeled NMSO3-containing liposomes (NMSO3-liposomes) to CHO cells expressing P-selectin (CHO-P cells) and activated platelets were examined. The distribution of NMSO3-liposomes incorporated into the cells was observed by fluorescence microscopy. RESULTS The binding assay revealed that NMSO3-liposomes specifically bound to immobilized P-selectin and CHO-P cells in a dose-dependent manner. The binding of NMSO3-liposomes to CHO-P cells was much stronger than that to the parental CHO-K1 cells. Fluorescence microscopic observation showed that NMSO3-liposomes were incorporated into CHO-P cells after the binding and distributed throughout the cytoplasm of the cell. NMSO3-liposomes bound more strongly to thrombin-activated platelets than to resting platelets, as assessed by flow cytometry. CONCLUSIONS These results suggest that NMSO3-liposomes can be applied for selective drug delivery to activated platelets.
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Affiliation(s)
- Saotomo Itoh
- Department of Microbiology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, 2-4-41 Ebara, Shinagawa-ku, Tokyo, 142-8501, Japan
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Huang J, Wang R, Liu X, Zeng X, Wei M. Sulfochitosan inhibits P-selectin-mediated HL-60 leukocyte adhesion under flow conditions. Cell Mol Biol Lett 2013; 18:200-8. [PMID: 23468382 PMCID: PMC6275797 DOI: 10.2478/s11658-013-0084-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2012] [Accepted: 02/18/2013] [Indexed: 11/20/2022] Open
Abstract
Excessive trafficking of leukocytes can lead to serious tissue injury. Here, four regioselectively sulfated chitosans were assessed as inhibitors of HL-60 leukocyte binding to P-selectin, by investigating their effect on leukocyte adhesion to CHO cells expressing human P-selectin under static and flow conditions. The results show that the sulfochitosans exhibit inhibitory activity in this general order: heparin > N-sulfated/6-O-sulfated chitosan ≥ 3-O,6-O-sulfated chitosan > 6-O-sulfated chitosan >> N-sulfated chitosan. This suggests that the sulfation of the double site in chitosan is essential for efficient inhibition of P-selectin-mediated HL-60 leukocyte adhesion and that such sulfochitosans may have potential as therapeutic agents against inflammatory disease.
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Affiliation(s)
- Jinfeng Huang
- Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, 130024 P. R. China
| | - Ruifei Wang
- Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, 130024 P. R. China
| | - Ximing Liu
- Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, 130024 P. R. China
| | - Xianlu Zeng
- Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, 130024 P. R. China
| | - Min Wei
- Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, 130024 P. R. China
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Alsac JM, Delbosc S, Rouer M, Journé C, Louedec L, Meilhac O, Michel JB. Fucoidan interferes with Porphyromonas gingivalis-induced aneurysm enlargement by decreasing neutrophil activation. J Vasc Surg 2013; 57:796-805. [DOI: 10.1016/j.jvs.2012.07.039] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2012] [Revised: 07/05/2012] [Accepted: 07/07/2012] [Indexed: 11/28/2022]
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Rouzet F, Bachelet-Violette L, Alsac JM, Suzuki M, Meulemans A, Louedec L, Petiet A, Jandrot-Perrus M, Chaubet F, Michel JB, Le Guludec D, Letourneur D. Radiolabeled fucoidan as a p-selectin targeting agent for in vivo imaging of platelet-rich thrombus and endothelial activation. J Nucl Med 2011; 52:1433-40. [PMID: 21849401 DOI: 10.2967/jnumed.110.085852] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
UNLABELLED P-selectin expression is involved in the pathophysiology of biologically active arterial thrombus and endothelial activation after a transient ischemic event. Fucoidan is a polysaccharidic ligand of P-selectin, with a nanomolar affinity. In the present study, we propose a new approach of P-selectin molecular imaging based on radiolabeled fucoidan. METHODS Two kinds of experimental models were selected to evaluate the ability of radiolabeled fucoidan to detect P-selectin expression: platelet-rich arterial thrombi (vegetations of infective endocarditis and arterial mural thrombus) and myocardial ischemia-reperfusion. These 2 settings were chosen because they were clinically relevant, and both were associated with an important overexpression of platelet and endothelial P-selectin, respectively. RESULTS (99m)Tc-fucoidan SPECT was able to detect the presence of platelet-rich arterial thrombi in all animals, with a median target-to-background ratio of 5.2 in vegetations of endocarditis and 3.6 in mural aneurysmal thrombus, and to detect a persistent endothelial activation at 2 h after reperfusion. In this latter model, the magnitude of the signal was correlated with the extent of myocardium that underwent transient ischemia. The sensitivity of selectivity of the uptake and retention of (99m)Tc-fucoidan in both settings was excellent. CONCLUSION This study supports (99m)Tc-fucoidan as a relevant imaging agent for in vivo detection of biologic activities associated with P-selectin overexpression, such as arterial thrombus and ischemic memory. Given the reported wide availability at a low cost, and its low toxicity, fucoidan seems to overcome some of the limitations of previous P-selectin-targeted imaging agents.
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Spetch L, Bowlin TL, Casola A. Effect of NMSO3 treatment in a murine model of human metapneumovirus infection. J Gen Virol 2009; 89:2709-2712. [PMID: 18931066 PMCID: PMC2800786 DOI: 10.1099/vir.0.2008/003301-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
BALB/c mice infected with human metapneumovirus (hMPV) were treated with the sulfated sialyl lipid NMSO3 (one dose of 50 mg kg(-1)) given at the time of infection. NMSO3 significantly reduced viral replication in the lungs, as well as hMPV-induced body weight loss, pulmonary inflammation and cytokine production, suggesting that antiviral treatment initiated at the beginning of viral infection can modify hMPV-induced disease.
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Affiliation(s)
- Leanne Spetch
- Department of Pediatrics, University of Texas Medical Branch, Galveston, TX, USA
| | | | - Antonella Casola
- Sealy Center for Vaccine Development, University of Texas Medical Branch, Galveston, TX, USA.,Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, TX, USA.,Department of Pediatrics, University of Texas Medical Branch, Galveston, TX, USA
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14
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Bachelet L, Bertholon I, Lavigne D, Vassy R, Jandrot-Perrus M, Chaubet F, Letourneur D. Affinity of low molecular weight fucoidan for P-selectin triggers its binding to activated human platelets. Biochim Biophys Acta Gen Subj 2008; 1790:141-6. [PMID: 19026722 DOI: 10.1016/j.bbagen.2008.10.008] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2008] [Revised: 10/13/2008] [Accepted: 10/18/2008] [Indexed: 12/12/2022]
Abstract
BACKGROUND P-selectin is an adhesion receptor expressed on activated platelets and endothelial cells. Its natural ligand, P-selectin glycoprotein ligand-1, is expressed on leucocytes and the P-selectin/PSGL-1 interaction is involved in leukocyte rolling. We have compared the interaction of P-selectin with several low molecular weight polysaccharides: fucoidan, heparin and dextran sulfate. METHODS Binding assays were obtained from the interaction of the polysaccharides with Sialyl Lewis X and PSGL-1 based constructs onto microtiter plates coated with P-selectin. SELDI TOF mass spectrometry was performed with anionic chips arrays coated with P-selectin in the absence or in the presence of polysaccharides. Kd were obtained from surface plasmon resonance experiments with immobilized P-selectin constructs, polysaccharides being injected in the mobile phase. Human whole blood flow cytometry experiments were performed with fluorescein isothiocyanate labelled polysaccharides with or without platelets activators. RESULTS The fucoidan prevented P-selectin binding to Sialyl Lewis X with an IC(50) of 20 nM as compared to 400 nM for heparin and <25000 nM for dextran sulfate. It exhibited the highest affinity for immobilized P-selectin with a KD of 1.2 nM, two orders of magnitude greater than the K(D) of the other polysaccharides. Mass spectrometry evidenced the formation of a complex between P-selectin and fucoidan. The intensity of the fucoidan binding to platelets was dependent on the level of platelet activation. Competition between fucoidan and an anti P-selectin antibody demonstrated the specificity of the interaction. GENERAL SIGNIFICANCE Low molecular weight fucoidan is a promising therapeutic agent of natural origin for biomedical applications.
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Affiliation(s)
- Laure Bachelet
- Inserm, U698, Cardiovascular Bioengineering, CHU X. Bichat, University Paris 7, Paris, F-75877, France
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15
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Xu J, Cai J, Anderson B, Wagner B, Albrecht R, Peek SF, Suresh M, Darien BJ. Cloning and functional characterization of recombinant equine P-selectin. Vet Immunol Immunopathol 2007; 116:115-30. [PMID: 17306378 DOI: 10.1016/j.vetimm.2007.01.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2006] [Revised: 01/03/2007] [Accepted: 01/08/2007] [Indexed: 11/24/2022]
Abstract
The recent molecular characterization and sequencing of equine P-selectin (ePsel), and its glycoprotein ligand, P-selectin glycoprotein ligand-1 (PSGL-1), have provided the tools for further investigation into their role in leukocyte trafficking. Here, we report the generation of a genetically engineered chimeric protein (ePsel-IgG) in which the equine P-selectin lectin and epithelial growth factor (EGF) domains were covalently linked to the equine IgG1 heavy chain constant region. The soluble ePsel-IgG was observed to bind to equine monocytes by confocal microscopy and flow cytometry. Furthermore, equine monocytes bound to immobilized ePsel-IgG in a time course and dose dependent manner. Not only did ePsel-IgG act as an adhesion molecule, it was also found to activate ERK1/2 kinase and induce IL-8 mRNA expression in equine monocytes. That all of the aforementioned ePsel-IgG-induced cell binding and cell signaling were abolished by the addition of EDTA, suggested that ePsel-IgG chimera mediated events occurred via the P-selectin ligand, PSGL-1. We were able to demonstrate that 78% of equine monocytes cross-reacted with anti-human HECA-452 antibody, which recognizes the sialy-Lewis X (sLex) epitope, a well-known carbohydrate binding site on human PSGL-1. Pre-incubation of equine PBMC with neuraminidase or O-sialoglycoprotein endopeptidase (OSGP) reduced ePsel-IgG monocyte binding to 36% or 60%, respectively. Taken together, these data suggest that there might be two ligand recognition sites on P-selectin, one of which recognizes sLex and another which recognizes P-selectin ligand core protein. The ePsel-IgG chimera can be a useful as a reagent for further studies on the role of equine P-selectin and signal transduction in inflammatory events in horse.
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Affiliation(s)
- Jin Xu
- Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706-1102, USA
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Meyer K, Beyene A, Bowlin TL, Basu A, Ray R. Coexpression of hepatitis C virus E1 and E2 chimeric envelope glycoproteins displays separable ligand sensitivity and increases pseudotype infectious titer. J Virol 2004; 78:12838-47. [PMID: 15542636 PMCID: PMC524985 DOI: 10.1128/jvi.78.23.12838-12847.2004] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2004] [Accepted: 07/22/2004] [Indexed: 02/05/2023] Open
Abstract
We have previously reported that a pseudotype virus generated by reconstitution of hepatitis C virus (HCV) chimeric envelope glycoprotein E1-G or E2-G on the surface of a temperature-sensitive mutant of vesicular stomatitis virus (VSVts045) interacts independently with mammalian cells to initiate infection. Here, we examined whether coexpression of both of the envelope glycoproteins on pseudotype particles would augment virus infectivity and/or alter the functional properties of the individual subunits. Stable transfectants of baby hamster kidney (BHK) epithelial cells expressing either one or both of the chimeric envelope glycoproteins of HCV on the cell surface were generated. The infectious titer of the VSV pseudotype, derived from a stable cell line incorporating both of the chimeric glycoproteins of HCV, was approximately 4- to 5-fold higher than that of a pseudotype bearing E1-G alone or approximately 25- to 30-fold higher than that of E2-G alone when assayed with a number of mammalian cell lines. Further studies suggested that that the E1-G/E2-G or E2-G pseudotype was more sensitive to the inhibitory effect of heparin than the E1-G pseudotype. Treatment of the E1-G/E2-G pseudotype with a negatively charged sulfated sialyl lipid (NMSO3) displayed a approximately 4-fold-higher sensitivity to neutralization than pseudotypes with either of the two individual glycoproteins. In contrast, VSVts045, used as a backbone for the generation of pseudotypes, displayed at least 20-fold-higher sensitivity to NMSO3-mediated inhibition of virus plaque formation. The effect of low-density lipoprotein on the E1-G pseudotype was greater than that apparent for the E1-G/E2-G pseudotype. The treatment of cells with monoclonal antibodies to CD81 displayed an inhibitory effect upon the pseudotype with E1-G/E2-G or with E2-G alone. Taken together, our results indicate that the HCV E1 and E2 glycoproteins have separable functional properties and that the presence of these two envelope glycoproteins on VSV/HCV pseudotype particles increases infectious titer.
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Affiliation(s)
- Keith Meyer
- Division of Infectious Diseases and Immunology, Saint Louis University, 3635 Vista Ave., FDT-8N, St. Louis, MO 63110, USA
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