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Vargas RD, Ding Y, Trial HO, Qian R, Ball ZT. Polyol recognition in catalysis: toward selective modification of glycosylated polypeptides with boronic acid-rhodium(II) catalysts. Chem Commun (Camb) 2023; 59:13030-13033. [PMID: 37842954 DOI: 10.1039/d3cc03371f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2023]
Abstract
Proximity-induced methodologies for peptide and protein modification have been developed using recognition elements like inhibitors, antibodies, or affinity tags on amino acids. However, the recognition of saccharides for chemical modification remains widely unexplored. Studies exploring boronic acids and their derivatives have shown their alluring capabilities as selective molecular recognition elements for saccharides, and in this study we describe the application of these ideas to the discovery of a catalytic proximity-induced methodology for covalent modification of glycopeptides using boronic acids as a saccharide recognition element.
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Affiliation(s)
- Reyner D Vargas
- Department of Chemistry, Rice University, Houston, Texas 77005, USA.
| | - Yuxuan Ding
- Department of Chemistry, Rice University, Houston, Texas 77005, USA.
| | - Hallie O Trial
- Department of Chemistry, Rice University, Houston, Texas 77005, USA.
| | - Rouyu Qian
- Department of Chemistry, Rice University, Houston, Texas 77005, USA.
| | - Zachary T Ball
- Department of Chemistry, Rice University, Houston, Texas 77005, USA.
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2
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Meyer CF, Seath CP, Knutson SD, Lu W, Rabinowitz JD, MacMillan DWC. Photoproximity Labeling of Sialylated Glycoproteins (GlycoMap) Reveals Sialylation-Dependent Regulation of Ion Transport. J Am Chem Soc 2022; 144:23633-23641. [PMID: 36525649 PMCID: PMC10782853 DOI: 10.1021/jacs.2c11094] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Sialylation, the addition of sialic acid to glycans, is a crucial post-translational modification of proteins, contributing to neurodevelopment, oncogenesis, and immune response. In cancer, sialylation is dramatically upregulated. Yet, the functional biochemical consequences of sialylation remain mysterious. Here, we establish a μMap proximity labeling platform that utilizes metabolically inserted azidosialic acid to introduce iridium-based photocatalysts on sialylated cell-surface glycoproteins as a means to profile local microenvironments across the sialylated proteome. In comparative experiments between primary cervical cells and a cancerous cell line (HeLa), we identify key differences in both the global sialome and proximal proteins, including solute carrier proteins that regulate metabolite and ion transport. In particular, we show that cell-surface interactions between receptors trafficking ethanolamine and zinc are sialylation-dependent and impact intracellular metabolite levels. These results establish a μMap method for interrogating proteoglycan function and support a role for sialylated glycoproteins in regulating cell-surface transporters.
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Affiliation(s)
- Claudio F. Meyer
- Merck Center for Catalysis at Princeton University, Princeton, New Jersey 08544, United States
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Ciaran P. Seath
- Merck Center for Catalysis at Princeton University, Princeton, New Jersey 08544, United States
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Steve D. Knutson
- Merck Center for Catalysis at Princeton University, Princeton, New Jersey 08544, United States
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Wenyun Lu
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
- Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, New Jersey 08544, United States
| | - Joshua D. Rabinowitz
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
- Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, New Jersey 08544, United States
- Ludwig Institute for Cancer Research, Princeton University, Princeton, New Jersey, 08544, United States
| | - David W. C. MacMillan
- Merck Center for Catalysis at Princeton University, Princeton, New Jersey 08544, United States
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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3
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Mukhina T, Brezesinski G, Schneck E. Phase Behavior and Miscibility in Two-Component Glycolipid Monolayers. J Phys Chem B 2022; 126:6464-6471. [PMID: 35976765 DOI: 10.1021/acs.jpcb.2c05016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Glycolipids are known to be involved in the formation of ordered functional domains in biological membranes. Since the structural characterization of such domains is difficult, most studies have so far dealt with lipid mixtures containing only one glycolipid component at a time, although biological membranes usually contain several glycolipid species, which can result in more complex structures and phase behavior. Here, we combine classical isotherm measurements with surface-sensitive grazing-incidence X-ray diffraction to investigate the phase behavior and miscibility in Langmuir monolayers of binary glycolipid mixtures. We find that the phase behavior has a subtle dependence on the saccharide headgroup chemistry. For compatible chemistries, molecular superlattice structures formed by one of the glycolipid species are conserved and can host foreign glycolipids up to a defined stoichiometry. In contrast, for sterically incompatible saccharide chemistries, the superlattice is lost even if both species are able to form such structures in their pure forms. Our results suggest that related phenomena may play important roles also in biological contexts.
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Affiliation(s)
- Tetiana Mukhina
- Institute for Condensed Matter Physics, TU Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany
| | - Gerald Brezesinski
- Institute for Condensed Matter Physics, TU Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany
| | - Emanuel Schneck
- Institute for Condensed Matter Physics, TU Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany
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4
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Temme JS, Gildersleeve JC. General Strategies for Glycan Microarray Data Processing and Analysis. METHODS IN MOLECULAR BIOLOGY (CLIFTON, N.J.) 2022; 2460:67-87. [PMID: 34972931 DOI: 10.1007/978-1-0716-2148-6_5] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Glycan microarrays provide a high-throughput technology for rapidly profiling interactions between carbohydrates and glycan-binding proteins (GBPs). Use of glycan microarrays involves several general steps, including construction of the microarray, carrying out the assay, detection of binding events, and analysis of the results. While multiple platforms have been developed to construct microarrays, most utilize fluorescence for detection of binding events. This chapter describes methods to acquire and process microarray images, including generating GAL files, imaging of the slide, aligning the grid, detecting problematic spots, and evaluating the quality of the data. The chapter focuses on processing our neoglycoprotein microarrays, but many of the lessons we have learned are applicable to other array formats.
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Affiliation(s)
- J Sebastian Temme
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD, USA
| | - Jeffrey C Gildersleeve
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD, USA.
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5
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Mukhina T, Brezesinski G, Shen C, Schneck E. Phase behavior and miscibility in lipid monolayers containing glycolipids. J Colloid Interface Sci 2022; 615:786-796. [PMID: 35176545 DOI: 10.1016/j.jcis.2022.01.146] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 01/19/2022] [Accepted: 01/23/2022] [Indexed: 01/02/2023]
Abstract
HYPOTHESIS Glycolipids in biological membranes are ubiquitous and believed to be involved in the formation of ordered functional domains. However, our current knowledge about such glycolipid-enriched domains is limited because they are inherently difficult to characterize. EXPERIMENTS We use grazing-incidence X-ray diffraction, isotherm measurements, and Brewster angle microscopy to investigate the phase behavior and miscibility in Langmuir lipid monolayers containing glycolipids. FINDINGS Glycolipid-enriched domains give rise to distinct diffraction patterns that allow for a systematic structural investigation and reveal a rich phenomenology, ranging from near-complete demixing to the formation of mixed domains with unique features. The phase behavior is governed by the headgroup chemistry and by the length and saturation of the tails.
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Affiliation(s)
- Tetiana Mukhina
- Institute for Condensed Matter Physics, TU Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany.
| | - Gerald Brezesinski
- Institute for Condensed Matter Physics, TU Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany.
| | - Chen Shen
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany.
| | - Emanuel Schneck
- Institute for Condensed Matter Physics, TU Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany.
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6
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Beulaja Manikandan S, Manikandan R, Arumugam M, Mullainadhan P. An overview on human serum lectins. Heliyon 2020; 6:e04623. [PMID: 32923708 PMCID: PMC7475231 DOI: 10.1016/j.heliyon.2020.e04623] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 07/16/2020] [Accepted: 07/31/2020] [Indexed: 01/25/2023] Open
Abstract
An extensive literature survey done on the various naturally occurring lectins in human serum upon its salient features such as methods of detection, level and sites of synthesis, binding specificity, cation dependency, modes of isolation, molecular and functional characterization way back from 1930s to till date was presented in a tabulated section. In addition, the generation of lectin and other immune molecules in vertebrates upon treatment with exogenous elicitors has also been framed in a tabular form. Furthermore, ANEW lectin induced in human serum for the very first time by an exogenous elicitor was detected, isolated and characterized by us whose features are also tabulated explicitly.
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Affiliation(s)
- S. Beulaja Manikandan
- Department of Biochemistry, Annai Veilankanni's College for Women, Saidapet, Chennai, Tamilnadu, 600015, India
| | - R. Manikandan
- Department of Zoology, University of Madras, Guindy Campus, Chennai, Tamilnadu, 600025, India
| | - M. Arumugam
- Department of Zoology, University of Madras, Guindy Campus, Chennai, Tamilnadu, 600025, India
| | - P. Mullainadhan
- Department of Zoology, University of Madras, Guindy Campus, Chennai, Tamilnadu, 600025, India
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Wang H, Qu X, Zhang Z, Lei M, Tan H, Bao C, Lin S, Zhu L, Kohn J, Liu C. Tag-Free Site-Specific BMP-2 Immobilization with Long-Acting Bioactivities via a Simple Sugar-Lectin Interaction. ACS Biomater Sci Eng 2020; 6:2219-2230. [PMID: 33455345 DOI: 10.1021/acsbiomaterials.9b01730] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The construction of a biomaterial matrix with biological properties is of great importance to developing functional materials for clinical use. However, the site-specific immobilization of growth factors to endow materials with bioactivities has been a challenge to date. Considering the wide existence of glycosylation in mammalian proteins or recombinant proteins, we establish a bioaffinity-based protein immobilization strategy (bioanchoring method) utilizing the native sugar-lectin interaction between concanavalin A (Con A) and the oligosaccharide chain on glycosylated bone morphogenetic protein-2 (GBMP-2). The interaction realizes the site-specific immobilization of GBMP-2 to a substrate modified with Con A while preserving its bioactivity in a sustained and highly efficient way, as evidenced by its enhanced ability to induce osteodifferentiation compared with that of the soluble GBMP-2. Moreover, the surface with Con A-bioanchored GBMP-2 can be reused to stimulate multiple batches of C2C12 cells to differentiate almost to the same degree. Even after 4 month storage at 4 °C in phosphate-buffered saline (PBS), the Con A-bioanchored GBMP-2 still maintains the bioactivity to stimulate the differentiation of C2C12 cells. Furthermore, the ectopic ossification test proves the in vivo bioactivity of bioanchored GBMP-2. Overall, our results demonstrate that the tag-free and site (i.e., sugar chain)-specific protein immobilization strategy represents a simple and generic alternative, which is promising to apply for other glycoprotein immobilization and application. It should be noted that although the lectin we utilized can only bind to d-mannose/d-glucose, the diversity of the lectin family assures that a specific lectin could be offered for other sugar types, thus expanding the applicable scope further.
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Affiliation(s)
| | | | - Zheng Zhang
- Department of Chemistry and Chemical Biology and New Jersey Center for Biomaterials, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | | | | | | | | | | | - Joachim Kohn
- Department of Chemistry and Chemical Biology and New Jersey Center for Biomaterials, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
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8
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Vasconcelos AA, Pomin VH. Marine Carbohydrate-Based Compounds with Medicinal Properties. Mar Drugs 2018; 16:E233. [PMID: 29987239 PMCID: PMC6070937 DOI: 10.3390/md16070233] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 07/02/2018] [Accepted: 07/04/2018] [Indexed: 02/06/2023] Open
Abstract
The oceans harbor a great diversity of organisms, and have been recognized as an important source of new compounds with nutritional and therapeutic potential. Among these compounds, carbohydrate-based compounds are of particular interest because they exhibit numerous biological functions associated with their chemical diversity. This gives rise to new substances for the development of bioactive products. Many are the known applications of substances with glycosidic domains obtained from marine species. This review covers the structural properties and the current findings on the antioxidant, anti-inflammatory, anticoagulant, antitumor and antimicrobial activities of medium and high molecular-weight carbohydrates or glycosylated compounds extracted from various marine organisms.
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Affiliation(s)
- Ariana A Vasconcelos
- Program of Glycobiology, Institute of Medical Biochemistry Leopoldo de Meis, and University Hospital Clementino Fraga Filho, Federal University of Rio de Janeiro, Rio de Janeiro, RJ 21941-913, Brazil.
| | - Vitor H Pomin
- Program of Glycobiology, Institute of Medical Biochemistry Leopoldo de Meis, and University Hospital Clementino Fraga Filho, Federal University of Rio de Janeiro, Rio de Janeiro, RJ 21941-913, Brazil.
- Department of BioMolecular Sciences, Division of Pharmacognosy, and Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, Oxford, MS 38677-1848, USA.
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9
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Tanaka J, Gleinich AS, Zhang Q, Whitfield R, Kempe K, Haddleton DM, Davis TP, Perrier S, Mitchell DA, Wilson P. Specific and Differential Binding of N-Acetylgalactosamine Glycopolymers to the Human Macrophage Galactose Lectin and Asialoglycoprotein Receptor. Biomacromolecules 2017; 18:1624-1633. [PMID: 28418238 DOI: 10.1021/acs.biomac.7b00228] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A range of glycopolymers composed of N-acetylgalactosamine were prepared via sequential Cu(I)-mediated polymerization and alkyne-azide click (CuAAC). The resulting polymers were shown, via multichannel surface plasmon resonance, to interact specifically with human macrophage galactose lectin (MGL; CD301) with high affinity (KD = 1.11 μM), but they did not bind to the mannose/fucose-selective human lectin dendritic-cell-specific intercellular adhesion molecule-3-grabbing nonintegrin (DC-SIGN; CD209). The effect of sugar ligand valency on the binding (so-called "glycoside cluster effect") of poly(N-acetylgalactosamine) to MGL was investigated by varying first the polymer chain length (DP: 100, 64, 40, 23, 12) and then the architecture (4- and 8-arm star glycopolymers). The chain length did not have a significant effect on the binding to MGL (KD = 0.17-0.52 μM); however, when compared to a hepatic C-type lectin of a similar monosaccharide specificity, the asialoglycoprotein receptor (ASGPR), the binding affinity was more noticeably affected (KD = 0.37- 6.65 μM). These data suggest that known differences in the specific configuration/orientation of the carbohydrate recognition domains of MGL and ASGPR are responsible for the differences in binding observed between the different polymers of varied chain length and architecture. In the future, this model has the potential to be employed for the development of tissue-selective delivery systems.
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Affiliation(s)
- Joji Tanaka
- Chemistry Department, University of Warwick , Library Road, CV4 7AL Coventry, United Kingdom
| | - Anne S Gleinich
- Clinical Sciences Research Institute, Warwick Medical School, University of Warwick , CV2 2DX Coventry, United Kingdom
| | - Qiang Zhang
- Chemistry Department, University of Warwick , Library Road, CV4 7AL Coventry, United Kingdom
| | - Richard Whitfield
- Chemistry Department, University of Warwick , Library Road, CV4 7AL Coventry, United Kingdom
| | - Kristian Kempe
- Chemistry Department, University of Warwick , Library Road, CV4 7AL Coventry, United Kingdom.,ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus), 399 Royal Parade, Parkville, Victoria 3152, Australia
| | - David M Haddleton
- Chemistry Department, University of Warwick , Library Road, CV4 7AL Coventry, United Kingdom.,ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus), 399 Royal Parade, Parkville, Victoria 3152, Australia
| | - Thomas P Davis
- Chemistry Department, University of Warwick , Library Road, CV4 7AL Coventry, United Kingdom.,ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus), 399 Royal Parade, Parkville, Victoria 3152, Australia
| | - Sébastien Perrier
- Chemistry Department, University of Warwick , Library Road, CV4 7AL Coventry, United Kingdom.,ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus), 399 Royal Parade, Parkville, Victoria 3152, Australia
| | - Daniel A Mitchell
- Clinical Sciences Research Institute, Warwick Medical School, University of Warwick , CV2 2DX Coventry, United Kingdom
| | - Paul Wilson
- Chemistry Department, University of Warwick , Library Road, CV4 7AL Coventry, United Kingdom.,ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus), 399 Royal Parade, Parkville, Victoria 3152, Australia
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10
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Zacco E, Anish C, Martin CE, v. Berlepsch H, Brandenburg E, Seeberger PH, Koksch B. A Self-Assembling Peptide Scaffold for the Multivalent Presentation of Antigens. Biomacromolecules 2015; 16:2188-97. [DOI: 10.1021/acs.biomac.5b00572] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Elsa Zacco
- Institute
of Chemistry and Biochemistry, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany
| | - Chakkumkal Anish
- Institute
of Chemistry and Biochemistry, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany
- Department
of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14424 Potsdam, Germany
- Bacterial Vaccines Discovery and Early Development, Janssen Pharmaceuticals (Johnson & Johnson), Leiden, The Netherlands
| | - Christopher E. Martin
- Institute
of Chemistry and Biochemistry, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany
- Department
of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14424 Potsdam, Germany
| | - Hans v. Berlepsch
- Institute
of Chemistry and Biochemistry, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany
- Research
Center of Electron Microscopy and Core Facility BioSupraMol, Institute
of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstraße
36a, 14195 Berlin, Germany
| | - Enrico Brandenburg
- Institute
of Chemistry and Biochemistry, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany
| | - Peter H. Seeberger
- Institute
of Chemistry and Biochemistry, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany
- Department
of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14424 Potsdam, Germany
| | - Beate Koksch
- Institute
of Chemistry and Biochemistry, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany
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11
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Ahn J, Park J, Kim YG, Lee EG, Kim MG, Shin YB. Label-free measurement of cell viability via counting cells attached on affinity substrates. BIOTECHNOL BIOPROC E 2014. [DOI: 10.1007/s12257-013-0556-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Pujari R, Eligar SM, Kumar N, Barkeer S, Reddy V, Swamy BM, Inamdar SR, Shastry P. Rhizoctonia bataticola lectin (RBL) induces caspase-8-mediated apoptosis in human T-cell leukemia cell lines but not in normal CD3 and CD34 positive cells. PLoS One 2013; 8:e79311. [PMID: 24244478 PMCID: PMC3828372 DOI: 10.1371/journal.pone.0079311] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2013] [Accepted: 09/20/2013] [Indexed: 01/06/2023] Open
Abstract
We have previously demonstrated immunostimulatory activity of a fungal lectin, Rhizoctonia bataticola lectin (RBL), towards normal human peripheral blood mononuclear cells. The present study aimed to explore the anticancer activities of RBL using human leukemic T-cell lines, Molt-4, Jurkat and HuT-78. RBL exhibited significant binding (>90%) to the cell membrane that was effectively inhibited by complex glycoproteins such as mucin (97% inhibition) and asialofetuin (94% inhibition) but not simple sugars such as N-acetyl-D-galactosamine, glucose and sucrose. RBL induced a dose and time dependent inhibition of proliferation and induced cytotoxicity in the cell lines. The percentage of apoptotic cells, as determined by hypodiploidy, was 33% and 42% in Molt-4 and Jurkat cells, respectively, compared to 3.11% and 2.92% in controls. This effect was associated with a concomitant decrease in the G0/G1 population. Though initiator caspase-8 and -9 were activated upon exposure to RBL, inhibition of caspase-8 but not caspase-9 rescued cells from RBL-induced apoptosis. Mechanistic studies revealed that RBL induced cleavage of Bid, loss of mitochondrial membrane potential and activation of caspase-3. The expression of the anti-apoptotic proteins Bcl-2 and Bcl-X was down regulated without altering the expression of pro-apoptotic proteins- Bad and Bax. In contrast to leukemic cells, RBL did not induce apoptosis in normal PBMC, isolated CD3+ve cells and undifferentiated CD34+ve hematopoietic stem and progenitor cells (HSPCs). The findings highlight the differential effects of RBL on transformed and normal hematopoietic cells and suggest that RBL may be explored for therapeutic applications in leukemia.
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Affiliation(s)
- Radha Pujari
- National Centre for Cell Science, Pune University Campus, Pune, Maharashtra, India
| | - Sachin M. Eligar
- Department of Biochemistry, Karnatak University, Dharwad, Karnataka, India
| | - Natesh Kumar
- National Centre for Cell Science, Pune University Campus, Pune, Maharashtra, India
| | - Srikanth Barkeer
- Department of Biochemistry, Karnatak University, Dharwad, Karnataka, India
| | - Vishwanath Reddy
- Department of Biochemistry, Karnatak University, Dharwad, Karnataka, India
| | - Bale M. Swamy
- Department of Biochemistry, Karnatak University, Dharwad, Karnataka, India
| | | | - Padma Shastry
- National Centre for Cell Science, Pune University Campus, Pune, Maharashtra, India
- * E-mail:
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13
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Maher S, Ryan KB, Ahmad T, O'driscoll CM, Brayden* DJ. Nanostructures Overcoming the Intestinal Barrier: Physiological Considerations and Mechanistic Issues. NANOSTRUCTURED BIOMATERIALS FOR OVERCOMING BIOLOGICAL BARRIERS 2012. [DOI: 10.1039/9781849735292-00039] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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14
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Manikandan B, Ramar M. Detection and characterization of natural and inducible lectins in human serum. RESULTS IN IMMUNOLOGY 2012; 2:132-41. [PMID: 24371577 DOI: 10.1016/j.rinim.2012.05.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2012] [Revised: 05/15/2012] [Accepted: 05/31/2012] [Indexed: 10/28/2022]
Abstract
This study was performed to detect and characterise the possible occurrence of natural and inducible lectins in human serum by hemagglutination method, wherein, the serum was treated using exogenous elicitors, namely, proteases and detergents. Natural and inducible lectins were detected and characterised in human serum. Untreated serum agglutinated buffalo and rabbit RBC, while serum treated with pronase, trypsin, α-chymotrypsin or SDS for the very first time, agglutinated hen/hen and sheep RBC within 15 min in a dosimetric manner. Cross adsorption test revealed that both trypsin and α-chymotrypsin-treated serum showed similar RBC adsorption pattern. The lectin activity in untreated, pronase-treated serum was cation independent and moderately sensitive/insensitive to calcium chelator EDTA, whereas, trypsin-treated serum was cation dependent as well as EDTA sensitive (sheep RBC), cation independent and EDTA insensitive (hen RBC). Hemagglutination of untreated serum was inhibited by certain glycosides and di-, oligo-saccharides, whereas, activity in pronase-treated serum was inhibited by hexosamines. By contrast, hemagglutination of trypsin-treated serum showed specificity for acetylated mannosamine as well as sialic acid for sheep RBC and certain glycoproteins for hen RBC. Thus, we have detected inducible lectins with distinct ligand binding specificity, upon treatment of human serum with proteases, namely, pronase and trypsin. Nevertheless, lectin activity was found in untreated human serum too with different ligand specificity.
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Affiliation(s)
- Beulaja Manikandan
- Department of Zoology, University of Madras, Guindy campus, Chennai 600 025, India
| | - Manikandan Ramar
- Department of Animal Health and Management, Alagappa University, Alagappapuram, Karaikudi 630003, India
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15
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Faury G, Molinari J, Rusova E, Mariko B, Raveaud S, Huber P, Velebny V, Robert A, Robert L. Receptors and aging: Structural selectivity of the rhamnose-receptor on fibroblasts as shown by Ca2+-mobilization and gene-expression profiles. Arch Gerontol Geriatr 2011; 53:106-12. [DOI: 10.1016/j.archger.2010.05.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2010] [Revised: 05/12/2010] [Accepted: 05/14/2010] [Indexed: 11/24/2022]
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16
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Allahverdian S, Wang A, Singhera GK, Wong BW, Dorscheid DR. Sialyl Lewis X modification of the epidermal growth factor receptor regulates receptor function during airway epithelial wound repair. Clin Exp Allergy 2010; 40:607-18. [PMID: 20447077 DOI: 10.1111/j.1365-2222.2010.03455.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
BACKGROUND Epidermal growth factor receptor (EGFR) is a major regulator of airway epithelial cell (AEC) functions such as migration, proliferation and differentiation, which play an essential role in epithelial repair. EGFR is a glycoprotein with 12 potential N-glycosylation sites in its extracellular domain. Glycosylation of EGFR has been shown to modulate its function. Previously, our laboratory demonstrated an important role of the carbohydrate structure sialyl Lewis x (sLe(x)) in airway epithelial repair. OBJECTIVE To examine whether an sLe(x) decoration of EGFR can modulate receptor function during AEC repair. METHODS Primary normal human bronchial epithelial (NHBE) cells were cultured in vitro. Co-localization of sLe(x) and EGFR was examined using confocal microscopy. Expressions of RNA and protein were analysed using RT-PCR and Western blotting. The final step in the synthesis of sLe(x) was catalysed by a specific alpha-1,3-fucosyltransferase (FucT-IV). To evaluate the role of sLe(x) in EGFR activation, a knockdown of the FucT-IV gene with small interfering RNA (siRNA) and an inhibitory anti-sLe(x) antibody (KM-93) was used. RESULTS We demonstrated a co-localization of sLe(x) with EGFR on NHBE cells using confocal microscopy. Using a blocking antibody for sLe(x) after a mechanical injury, we observed a reduction in EGFR phosphorylation and epithelial repair following injury. FucT-IV demonstrates a temporal expression coordinate with epithelial repair. Down-regulation of FucT-IV expression in NHBE by specific siRNA suppressed sLe(x) expression. The use of FucT-IV siRNA significantly reduced phosphorylation of EGFR and prevented epithelial repair. An immunohistochemical analysis of human normal and asthmatic airways showed a significant reduction in sLe(x) and tyrosine-phosphorylated EGFR (pY(845)-EGFR) in the epithelium of asthmatic subjects compared with that of normal subjects. CONCLUSION The present data demonstrate that sLe(x), in association with EGFR, in NHBE is coordinate with repair. This glycosylation is important in modulating EGFR activity to affect the repair of normal primary AEC.
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Affiliation(s)
- S Allahverdian
- Department of Medicine, UBC James Hogg Research Centre, Providence Heart+Lung Institute, St. Paul's Hospital, University of British Columbia, Vancouver, Canada
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17
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Faury G, Ruszova E, Molinari J, Mariko B, Raveaud S, Velebny V, Robert L. The α-l-Rhamnose recognizing lectin site of human dermal fibroblasts functions as a signal transducer. Biochim Biophys Acta Gen Subj 2008; 1780:1388-94. [DOI: 10.1016/j.bbagen.2008.07.008] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2007] [Revised: 07/05/2008] [Accepted: 07/10/2008] [Indexed: 01/18/2023]
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18
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Smart JD. Lectin-mediated drug delivery in the oral cavity. Adv Drug Deliv Rev 2004; 56:481-9. [PMID: 14969754 DOI: 10.1016/j.addr.2003.10.016] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2003] [Accepted: 10/14/2003] [Indexed: 11/27/2022]
Abstract
The delivery of therapeutic agents to, or via, the oral cavity is limited by the efficient removal mechanisms that exist in this area. Lectins are proteins or glycoproteins that bind to specific sugar residues, and can, therefore, interact with the glycoconjugates present on cell surfaces or salivary mucins. Endogenous lectins could also be used as points of attachment for carbohydrate-containing delivery systems. This review considers the possibility of using lectins as targeting agents within the oral cavity and reports on some of the limited number of studies completed to date. As lectins are multifunctional molecules, the possibility of using them as both targeting and therapeutic agents is considered. Lectin-containing delivery systems are a potential innovation for targeted and prolonged therapy within the oral cavity, but considerations such as toxicity and cost will need to be addressed before their routine use becomes a reality.
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Affiliation(s)
- John D Smart
- Biomaterials and Drug Delivery Group, School of Pharmacy and Biomedical Sciences, University of Portsmouth, White Swan Road, Portsmouth PO1 2DT, UK.
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19
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Zanetta JP. Mannose-binding lectins in cerebrum development. PROGRESS IN MOLECULAR AND SUBCELLULAR BIOLOGY 2003; 32:75-96. [PMID: 12827972 DOI: 10.1007/978-3-642-55557-2_4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Affiliation(s)
- J P Zanetta
- Laboratoire de Glycobiologie Structurale et Fonctionnelle, CNRS UMR 8576, Batiment C9, 59655 Villeneuve d'Ascq, France
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20
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Smart JD, Nicholls TJ, Green KL, Rogers DJ, Cook JD. Lectins in drug delivery: a study of the acute local irritancy of the lectins from Solanum tuberosum and Helix pomatia. Eur J Pharm Sci 1999; 9:93-8. [PMID: 10494002 DOI: 10.1016/s0928-0987(99)00050-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Lectins are proteins or glycoproteins of non-immune origin capable of binding to one or more specific sugar residues. The potential for using lectins as a means of 'anchoring' a drug delivery system to the mucosal surfaces of the eye has been investigated in previous work, with the lectins from Solanum tuberosum and Helix pomatia showing particular promise. In this study the acute local dermal irritancy of these lectins, in terms of their potential to cause inflammation and tissue necrosis, was investigated. After an initial study in terminally anaesthetised animals (to ensure no gross toxicity was evident), five male New Zealand white rabbits from the same litter were briefly anaesthetised and Evans blue injected intravenously as a marker of inflammation. Sterile lectin solutions in normal saline at a range of concentrations from 50 to 500 microg ml(-1) were prepared and 50-microl volumes injected intradermally at 18 sites across a shaved area of each rabbit's back. The rabbits were then allowed to regain consciousness. There was no evidence of tissue necrosis, oedema or Evans blue infiltration with any of the lectin solutions administered. The rabbits did not display any signs of discomfort such as scratching or continued grooming throughout the experiment. Histological examination of the injection sites revealed little sign of any inflammation, such as heterophil migration, oedema or tissue damage. It was concluded that these lectins demonstrate minimal acute irritancy, and will, therefore, be taken forward for formulation and in vivo studies.
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Affiliation(s)
- J D Smart
- Biomaterials and Drug Delivery Research Group, Institute of Biomedical and Biomolecular Sciences, School of Pharmacy and Biomedical Sciences, University of Portsmouth, Portsmouth, UK.
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21
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Abstract
The notion of 'pathological homeostasis' (PH) allows a better understanding of the escape phenomena to the effects of a therapy, as suggested by experimental researches. This concept refers to mechanisms we already know as desensitization, mutation, etc. Moreover, it focuses on the following possibility: in a couple of antagonistic agents, the already prevalent one will increase even more so that it could cancel the therapeutic effect of the administered opposite agent. PH is also defined as a change in the norms of the cell regulation or of the great systems of regulation in the body. In order to neutralize this occurrence, the PH notion may open up on new experimental studies and therapeutical strategies.
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Affiliation(s)
- E Bernard-Weil
- Fondation Ophthalmologique A. de Rothschild, Paris, France
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22
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Yoshimi Y, Yamazaki S, Ikekita M. Developmental changes in Asn-linked neutral oligosaccharides in murine cerebrum. BIOCHIMICA ET BIOPHYSICA ACTA 1999; 1426:69-79. [PMID: 9878692 DOI: 10.1016/s0304-4165(98)00123-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The changes in Asn-linked oligosaccharide composition in the murine cerebrum during development have been examined by high-performance liquid chromatography (HPLC) and electrospray ionization mass spectrometry (ESI-MS). The oligosaccharides, obtained from murine cerebrum in several developmental stages, were separated by HPLC on anion-exchange and reverse-phase columns. We found that two Asn-linked oligosaccharides, designated oligosaccharide I and oligosaccharide II, had their expression changed during postnatal development. Whereas oligosaccharide I was reduced during brain development, oligosaccharide II was increased. The structures of oligosaccharides I and II were analyzed by ESI-MS and sequential exoglycosidase digestions. Judging from the molecular and fragment ions in each oligosaccharide, the oligosaccharide I was composed of 5Hex+2HexNAc+ABOE (MW 1467.2) and the oligosaccharide II was 3Hex+4HexNAc+DoHex+ABOE (MW 1695.2). The results of sequential exoglycosidase digestion indicated that the oligosaccharide I was an oligomannose type saccharide and the oligosaccharide II was a biantennary complex type saccharide including fucose. The proposed structures are shown below. These results offer an important clue to the role of Asn-linked oligosaccharides associated with development of the central nervous system.
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Affiliation(s)
- Y Yoshimi
- Department of Applied Biological Science, Faculty of Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda, Chiba, Japan.
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23
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Melato M, Mustac E, Valkovic T, Bottin C, Sasso F, Jonjic N. The lectin-binding sites for peanut agglutinin in invasive breast ductal carcinomas and their metastasis. Pathol Res Pract 1998; 194:603-8. [PMID: 9793958 DOI: 10.1016/s0344-0338(98)80094-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
Peanut agglutinin (PNA) lectin-binding site patterns in primary invasive breast ductal not otherwise specified (NOS) carcinomas are related to aggressiveness of the tumor. The present study was designed to compare the expression of PNA-binding sites in the primary tumor and in local lymph node metastases. The expression of lectin-binding sites was studied using the avidin-biotin complex/immunoperoxidase technique and analyzed in relation to age of the patient and size of the breast cancer. Breast cancers and their metastases showed negativity or positivity, the latter being divided into "apical" and "non-apical" (i.e. membrane and/or cytoplasmic) depending on the main localization of staining in tumor cells. No correlation was found between primary tumors and metastases as regards PNA-binding patterns, which confirms the opinion that advanced primary tumors are polyclonal and that selected subclones of malignant cells give rise to metastases. Furthermore, the fact that primary tumors with PNA non-apical expression, a feature related to aggressiveness and poor differentiation, may have lymph node metastases with apical expression, suggests that this pattern, although no longer evident in the primary tumor, is involved in the process of cell metastasis.
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Affiliation(s)
- M Melato
- Department of Biomedical Science, Medical Faculty, University of Rijeka, Croatia.
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24
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Nantwi PK, Cook DJ, Rogers DJ, Smart JD. Lectins for drug delivery within the oral cavity--investigation of lectin binding to oral mucosa. J Drug Target 1998; 5:45-55. [PMID: 9524313 DOI: 10.3109/10611869708995857] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The aim of this study was to identify receptors present on the buccal mucosa in order to select appropriate lectins that will allow the retention of a dosage form within the oral cavity. Studies using human buccal cells, the avidin-biotin-complex/diaminobenzidine method for identifying lectin binding and a microdensitometer to allow a semi-quantitative analysis of stain intensity, showed a wide diversity of lectin receptors. Kinetic studies of lectin binding to buccal cells revealed significant binding after 20 s, particularly for lectins from Pisum sativum and Arachis hypogaea. A significant reduction in lectin binding was observed after exposing buccal cells to a series of lectin solutions pre-treated with a large excess of secretor or non-secretor saliva. However when bound to the buccal cells, there was little displacement of lectins on exposure to either saliva types. Further studies on rat oral tissue suggested that the lectins appeared to bind to varying degrees on whole oral epithelial surfaces although differences in binding between this and the human buccal cell model were evident. It was concluded that a wide range of possible target receptors for lectins are present on rat oral epithelium and human buccal cells. Lectin binding to these receptors can be affected by the exposure time and the presence of saliva.
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Affiliation(s)
- P K Nantwi
- School of Pharmacy and Biomedical Science, University of Portsmouth, U.K
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25
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Zanetta JP, Bonaly R, Maschke S, Strecker G, Michalski JC. Hypothesis: immunodeficiencies in -mannosidosis, mycosis, AIDS and cancer--a common mechanism of inhibition of the function of the lectin interleukin 2 by oligomannosides. Glycobiology 1998. [DOI: 10.1093/oxfordjournals.glycob.a018837] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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26
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Haltner E, Easson JH, Lehr CM. Lectins and bacterial invasion factors for controlling endo- and transcytosis of bioadhesive drug carrier systems. Eur J Pharm Biopharm 1997. [DOI: 10.1016/s0939-6411(97)00096-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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27
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Denk PO, Breipohl W, Naib-Majani W, Knorr M. Regional glycoprotein expression in the chicken lens. Curr Eye Res 1997; 16:527-33. [PMID: 9192160 DOI: 10.1076/ceyr.16.6.527.5083] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
PURPOSE Several previous studies have shown that glycoconjugates of extracellular matrix, cell membrane and nucleus play an important role in the mediation of cell proliferation, migration and differentiation. Lens epithelial cells and lens fiber cells show regional differences with regard to these parameters. If glycoconjugates participate in the regulation of these patterns in the lens, there should be regional differences in the expression of glycoconjugates. The investigation was focused on the anterior pole, equator and nuclear bow regions, which differ extensively in lens cell proliferation and differentiation. METHODS To check this hypothesis, the regional binding pattern of twelve different FITC-conjugated lectins was studied glycohistochemically, using paraffin embedded material. The investigation was focused on the anterior pole, equator and nuclear bow regions. RESULTS Regional differences in lectin binding patterns were identified in the lens capsule, epithelium and the nuclear bow regions. The lens capsule was fluorescently labeled with GS-I, UEA-I, LPA, MAA, SNA only at the anterior pole and with CON-A, WGA, DBA, SBA only at the equator. Staining of the entire anterior surface of the lens capsule was observed with LFA. Cell membranes of the lens epithelium showed binding of MAA and LFA only at the equator. LFA, LPA, MAA and SNA only stained the nuclei of fiber cells at the nuclear bow region but not of lens epithelial cells. WGA strongly labeled the nuclei of equatorial epithelial cells and fiber cells at the bow region. CONCLUSIONS It is assumed that the observed regional variations in glycoprotein expression in the extracellular matrix and lens cells contribute to the regulation of cell behavior in different areas of the lens.
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Affiliation(s)
- P O Denk
- Department of Ophthalmology, University of Tübingen, Germany
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28
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Tortorella H, Konrath RA, Mazzini MN, Brandelli A. Proteolytic release and partial characterization of human sperm-surface glycopeptides. Braz J Med Biol Res 1997; 30:387-93. [PMID: 9246237 DOI: 10.1590/s0100-879x1997000300013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Sperm-surface glycopeptides were obtained from intact sperm membranes after proteolytic release by different enzymatic treatments such as autoproteolysis, trypsin, papain and pronase. Glycopeptides were isolated, their properties and composition were examined, and their monosaccharide and amino acid constituents were characterized. The monosaccharides identified were fucose, mannose, galactose, N-acetylglucosamine, and N-acetylgalactosamine, which form part of more than one type of oligosaccharide units. Autoproteolytic treatment mainly provided O-glycosidic type oligosaccharides, while a mixture of O- and N-glycosidic oligosaccharides was obtained in variable proportions when treated with trypsin, papain or pronase. The highest degree of peptide cleavage was obtained with pronase. Despite the higher yields reached with trypsin, these glycopeptides contain the lowest percentage of oligosaccharide chains. Proteolytic treatment provides a simple, rapid procedure for the isolation of glycopeptides from the sperm surface.
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Affiliation(s)
- H Tortorella
- Departamento de Bioquímica, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brasil
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29
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Mustac E, Melato M, Sasso F, Valkovic T, Bottin C, Jonjic N. The lectin-binding sites for peanut agglutinin in invasive breast ductal carcinomas and their role as a prognostic factor. J Cancer Res Clin Oncol 1996; 122:693-7. [PMID: 8898981 DOI: 10.1007/bf01209034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The present study was designed to analyze the expression of lectin-binding sites for peanut agglutinin (PNA) in paraffin sections of primary invasive ductal carcinoma not otherwise specified and to consider PNA lectin histochemistry as a further aid in the prognostic evaluation of breast cancer. The expression of lectin-binding sites was studied using the avidin-biotin complex/ immunoperoxidase technique, and analyzed in relation to the different clinical, pathological, and biological parameters of the primary disease, i.e. the presence or absence of nodal metastases, pre- or post-menopausal age, size of the tumor, mitotic activity index, morphometric prognostic index, DNA content, S-phase fraction, and steroid receptor status. The results show significant differences in PNA binding patterns among malignant epithelial breast cells. There was no expression of PNA-binding sites in 14 out of 157 tumors, while 64 showed mostly apical (membrane) staining and 124 non-apical (membrane and/or cytoplasmic) staining. Apical staining was mostly observed in patients without lymph node metastasis, with positive steroid receptor status, and those who were postmenopausal diagnosis; non-apical staining was mostly observed in lymph-node-positive premenopausal patients negative for steroid receptors and with aneuploid tumor cells. Our results indicate that, in malignant breast cells, there is an alteration of cell-surface glycoconjugates, shown by heterogeneity within a histopathologically defined group, which is related to different properties of tumor cells. The apical PNA binding pattern indicates a better differentiation of tumor cells while non-apical PNA binding suggests a higher metastatic potential. Specific PNA lectin binding patterns should be considered as a further reliable prognostic factor in breast cancer.
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Affiliation(s)
- E Mustac
- Department of Pathology, Medical Faculty, University of Rijeka, Croatia
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Zanetta JP, Wantyghem J, Kuchler-Bopp S, Badache A, Aubery M. Human lymphocyte activation is associated with the early and high-level expression of the endogenous lectin CSL at the cell surface. Biochem J 1995; 311 ( Pt 2):629-36. [PMID: 7487906 PMCID: PMC1136046 DOI: 10.1042/bj3110629] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Lymphocytes undergo activation in response to antigens, cytokines, lectins and antibodies interacting with specific cell-surface molecules or through substances influencing signal transduction pathways. This study shows that human T- and B-cells stimulated using phorbol esters or plant lectins express early (2 h using phorbol esters and 24 h using plant lectins) a high level of a polyvalent carbohydrate-binding protein, the cerebellar soluble lectin (CSL), which is in part externalized. The lectin, immunologically related to CDw70, interacts with specific glycoprotein ligands of the lymphocyte surface, including CD3 on T-cells and CD24 on B-cells. Major changes in phosphorylations associated with activation appear as largely CSL-dependent since they are specifically inhibited by anti-CSL Fab fragments. It is suggested that the lectin induces the clustering of specific cell-surface glycoproteins and plays the role of an endogenous amplifier of activation signals.
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Affiliation(s)
- J P Zanetta
- Laboratoire de Neurobiologie Moléculaire des Interactions Cellulaires, CNRS UPR 416, Centre de Neurochimie du CNRS, Strasbourg, France
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31
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Zanetta JP, Tranchant C, Kuchler-Bopp S, Lehmann S, Warter JM. Presence of anti-CSL antibodies in the cerebrospinal fluid of patients: a sensitive and specific test in the diagnosis of multiple sclerosis. J Neuroimmunol 1994; 52:175-82. [PMID: 8034757 DOI: 10.1016/0165-5728(94)90111-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The carbohydrate-binding protein (lectin) CSL is an antigen involved in the stabilization of the myelin structure by interacting with the carbohydrate moiety of myelin glycoproteins. Since anti-CSL Fab fragments were able to produce destruction of CNS myelin in vitro, CSL was considered as a potential immunological target in multiple sclerosis. The presence of anti-CSL antibodies has been examined in the cerebrospinal fluid of 1388 different patients with various neurological diseases. It is concluded that the presence of anti-CSL antibodies in the cerebrospinal fluid of patients less than 50 years old constitutes a very sensitive and specific test for multiple sclerosis.
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Affiliation(s)
- J P Zanetta
- LNMIC CNRS UPR 416, Centre de Neurochimie, Strasbourg, France
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