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Wang X, Yue L, Zhang F, Tang Z, Chen Z, Li Z. A novel strategy for quantification of α2,3- and α2,6-linked sialic acids in sialylated glycoproteins. Carbohydr Res 2023; 531:108892. [PMID: 37429229 DOI: 10.1016/j.carres.2023.108892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Revised: 06/24/2023] [Accepted: 06/28/2023] [Indexed: 07/12/2023]
Abstract
Sialic acid, a monosaccharide containing nine carbon atoms, is widely distributed in eukaryotic cells. The bound sialic acids are mainly present at the glycan ends of glycoconjugates via α2-3 or α2-6 glycosidic bonds, and alterations in their expression levels and linkage types are associated with the progress of many diseases and tumors. The present study provides a new strategy for quantification of α2,3- and α2,6-linked sialic acids in sialylated glycoproteins. In fact, quantification of α2,3-linked sialic acids were based on the difference of the bound sialic acids in the sample before and after treatment with α2-3 neuraminidase, whereas the α2,6-linked sialic acids were equal to the bound sialic acids in the α2-3 neuraminidase-treated sample. Subsequently, α2,3/6-linked sialic acids in salivary glycoproteins from healthy volunteers and diabetic patients were quantified in accordance with this method. This work provides an accurate method for the quantification of α2,3- and α2,6-linked sialic acids in the sialoglycoproteins, which is more instructive for understanding the biological roles of α2,3/6-linked sialic acid in sialoglycoproteins.
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Affiliation(s)
- Xilong Wang
- College of Life Sciences and Technology, Longdong University, Qingyang, Gansu, China; Gansu Key Laboratory of Protection and Utilization for Biological Resources and Ecological Restoration, Qingyang, Gansu, China.
| | - Lixin Yue
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Fan Zhang
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, Shaanxi, China
| | - Zhen Tang
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, Shaanxi, China
| | - Zhuo Chen
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, Shaanxi, China
| | - Zheng Li
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, Shaanxi, China
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Determination of sialic acid and gangliosides in biological samples and dairy products: A review. J Pharm Biomed Anal 2010; 51:346-57. [DOI: 10.1016/j.jpba.2009.04.023] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2009] [Revised: 04/17/2009] [Accepted: 04/23/2009] [Indexed: 11/20/2022]
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Alptürk O, Rusin O, Fakayode SO, Wang W, Escobedo JO, Warner IM, Crowe WE, Král V, Pruet JM, Strongin RM. Lanthanide complexes as fluorescent indicators for neutral sugars and cancer biomarkers. Proc Natl Acad Sci U S A 2006; 103:9756-60. [PMID: 16785432 PMCID: PMC1479863 DOI: 10.1073/pnas.0603758103] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Simple water-soluble lanthanum and europium complexes are effective at detecting neutral sugars as well as glycolipids and phospholipids. In solutions at physiologically relevant pH the fluorescent lanthanum complex binds neutral sugars with apparent binding constants comparable to those of arylboronic acids. Interference from commonly occurring anions is minimal. The europium complex detects sialic acid-containing gangliosides at pH 7.0 over an asialoganglioside. This selectivity is attributed, in large part, to the cooperative complexation of the oligosaccharide and sialic acid residues to the metal center, based on analogous prior studies. In MeOH, lysophosphatidic acid (LPA), a biomarker for several pathological conditions including ovarian cancer, is selectively detected by the europium complex. LPA is also detected via a fluorescence increase in human plasma samples. The 2-sn-OH moiety of LPA plays a key role in promoting binding to the metal center. Other molecules found in common brain ganglioside and phospholipid extracts do not interfere in the ganglioside or LPA fluorescence assays.
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Affiliation(s)
- Onur Alptürk
- *Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803; and
| | - Oleksandr Rusin
- *Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803; and
| | - Sayo O. Fakayode
- *Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803; and
| | - Weihua Wang
- *Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803; and
| | - Jorge O. Escobedo
- *Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803; and
| | - Isiah M. Warner
- *Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803; and
| | - William E. Crowe
- *Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803; and
| | - Vladimir Král
- Department of Analytical Chemistry, Institute of Chemical Technology, Techniká 5,166 28 Prague, Czech Republic
| | - Jeff M. Pruet
- *Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803; and
| | - Robert M. Strongin
- *Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803; and
- To whom correspondence should be addressed. Louisiana State University, 232 Choppin Hall, Baton Rouge, LA 70803. E-mail:
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Gopaul KP, Crook MA. Sialic acid: a novel marker of cardiovascular disease? Clin Biochem 2006; 39:667-81. [PMID: 16624269 DOI: 10.1016/j.clinbiochem.2006.02.010] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2005] [Revised: 02/19/2006] [Accepted: 02/22/2006] [Indexed: 02/08/2023]
Abstract
The global burden posed by cardiovascular disease (CVD), due to a rising incidence of known risk factors, underlines an urgent need to identify other potential risk factors. Sialic acid (SA), an abundant terminal monosaccharide of glycoconjugates, is a possible risk factor for CVD. Although large-scale epidemiological surveys have shown that serum total sialic acid (TSA) is positively associated with mortality from coronary artery disease (CAD) and stroke, studies investigating the correlation between serum TSA and the severity of atherosclerosis are conflicting. Clinical and epidemiological studies indicate that serum TSA is a marker of a sustained inflammatory response in CVD, rather than causal in nature. Data also indicates ethnic variation in baseline TSA. This article reviews current methods for determining serum TSA and evidence supporting serum TSA as a risk factor for CVD. Potential mechanisms for this role are examined. The use of serum TSA as a marker of atherosclerotic disease is evaluated.
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Affiliation(s)
- Karina P Gopaul
- Guy's, King's, and St. Thomas' Hospitals School of Medicine, King's College London, London, UK
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Yang Y, Lewis PT, Escobedo JO, Luce NNS, Treleaven WD, Cook RL, Strongin RM. Mild Colorimetric Detection of Sialic Acid. ACTA ACUST UNITED AC 2004. [DOI: 10.1135/cccc20041282] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
As part of a broader program focusing on the detection of colorless biomolecules in the visible region, a simple and mild procedure for the visual detection of the most abundant sialic acid at room temperature and neutral pH is reported. The role of the interaction of the sialic acid amide with boron in a readily synthesized boronic acid-based receptor is an important feature of the signaling mechanism. Selectivity of reaction can be tuned by the judicious choice of solvents. This study embodies a departure from many of the author's earlier efforts in sugar solutions that are not heated, affording relatively more selective and milder detection.
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Kim KK, Escobedo JO, St. Luce NN, Rusin O, Wong D, Strongin RM. Postcolumn HPLC detection of mono- and oligosaccharides with a chemosensor. Org Lett 2003; 5:5007-10. [PMID: 14682751 PMCID: PMC3376175 DOI: 10.1021/ol035978q] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Novel chromophoric compound 1 promotes the HPLC postcolumn detection of mono- and oligosaccharides. The detection of chromatographic peaks in the visible region for glucose, fructose, maltodextrins, sialic acid, and a ganglioside can be accomplished with a standard UV-vis detector. The use of selective, reversible binding agents in automated HPLC assays should allow for improved monitoring of specific analytes as well as material recovery. [structure: see text]
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Affiliation(s)
- Kyu Kwang Kim
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Jorge O. Escobedo
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Nadia N. St. Luce
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Oleksandr Rusin
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Douglas Wong
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Robert M. Strongin
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
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Lamari FN, Karamanos NK. Separation methods for sialic acids and critical evaluation of their biologic relevance. J Chromatogr B Analyt Technol Biomed Life Sci 2002; 781:3-19. [PMID: 12450650 DOI: 10.1016/s1570-0232(02)00432-4] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Sialic acids are biosynthesized by almost all organisms as a 9-carbon carboxylated monosaccharide and are integral components of glycoconjugates. More than 40 naturally occurring sialic acid derivatives of the three main forms of sialic acids, the N-acetyl- and N-glycolylneuraminic acid and 2-keto-3-deoxy-nonulosonic acid have been identified. Due to the great importance of sialic acids as key mediators in a plethora of cellular events, including cell-cell recognition and cell-matrix interactions, their analysis in biologic samples is useful for a deeper understanding of the various (patho)physiological processes and of value in disease diagnosis and monitoring. In this review we summarize the methodology developed to isolate and liberate sialic acids from biologic samples as well as the chromatographic, electromigration and hyphenated techniques available for their separation and analysis. A critical evaluation of the biological relevance of the results obtained by analyzing sialic acids in biologic samples is also presented.
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Affiliation(s)
- Fotini N Lamari
- Department of Chemistry, Section of Organic Chemistry, Biochemistry and Natural Products, Laboratory of Biochemistry, University of Patras, 261 10 Patras, Greece
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Burova T, Lecompte F, Galet C, Monsallier F, Delpech S, Haertlé T, Combarnous Y. Conformational stability and in vitro bioactivity of porcine luteinizing hormone. Mol Cell Endocrinol 2001; 176:129-34. [PMID: 11369452 DOI: 10.1016/s0303-7207(01)00447-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Temperature-dependent dissociation of porcine luteinizing hormone (pLH) and of two of its glycoforms was studied by a combination of SDS-PAGE and micro-scale size-exclusion HPLC in parallel with the study of co-operative folding by high-sensitivity differential scanning calorimetry (HS-DSC). The transition temperature of dissociation of pLH at pH 7.0 as quantified by SDS-PAGE, HPLC and residual activity in radioreceptor assay was found to match exactly the transition temperature of its unfolding as measured by HS-DSC. Free alpha- and beta-subunits did not exhibit any unfolding transition in the same conditions. The microcalorimetric data for two pLH isoforms exhibiting different glycosylations were identical to those of a preparation of non-separated isoforms. It is concluded that: (a) free subunits exhibit no co-operative folding (i.e. no stable three-dimensional structure) and co-operative folding occurs only in alphabeta heterodimers; (b) the co-operative folding is responsible for the stability of the association of subunits; and (c) the heterogeneity of carbohydrate chains does not affect the stability of folding and association of subunits. The fastening of the "seat-belt" of the beta-subunit embracing the alpha-subunit by the Cysbeta26-beta110 disulfide bridge had been postulated to play a role in the preservation of the dimeric structure of gonadotropins. The present work shows that dissociation of subunits is directly related to their loss of common co-operative folding.
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Affiliation(s)
- T Burova
- Laboratoire d'Etude des Interactions des Molécules Alimentaires, Institut National de la Recherche Agronomique (INRA), B.P. 71627, 44316 Nantes Cedex 03, France
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