1
|
Rosenstock P, Horstkorte R, Gnanapragassam VS, Harth J, Kielstein H. Siglec-7 expression is reduced on a natural killer (NK) cell subset of obese humans. Immunol Res 2018; 65:1017-1024. [PMID: 28786023 PMCID: PMC5613057 DOI: 10.1007/s12026-017-8942-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Obesity leads to an altered adipocytokine production negatively effecting the function of natural killer cells (NK cells), which are important effector cells of the innate immune system. NK cells provide a defence against tumour cells or virus infected cells and have different activating and inhibitory surface receptors to distinguish between normal and transformed cells. One group of the inhibitory receptors are the sialic acid-binding immunoglobulin-like lectins (Siglecs). The aim of this study was to compare the expression of Siglecs-7, -9 and -10 on NK cells from normal weight and obese subjects. Therefore peripheral blood mononuclear cells (PBMC) were isolated from 10 normal weight (BMI < 25 kg/m2) and 11 obese (BMI > 30 kg/m2) blood donors and analysed by flow cytometry. Moreover, the amount of sialic acid on NK cell was determined using a fluorescent labelled lectin that binds terminal sialic acids. Percentages of immune cells were not altered between normal weight and obese individuals. CD56bright NK cells from obese subjects had a reduced expression of Siglec-7 while the expression of Siglec-9 was not altered. The reduction of Siglec-7 expression on CD56bright NK cells might be a marker for their dysfunction. Moreover, Siglecs-7, -9 and -10 are not expressed on the NK cell lines NK-92 and NKL. When comparing the two NK cell subpopulations CD56bright and CD56dim, CD56bright NK cells had a higher amount of sialic acids on their surface compared to CD56dim NK cells regardless of body weight.
Collapse
Affiliation(s)
- Philip Rosenstock
- Institute for Physiological Chemistry, Martin Luther University Halle-Wittenberg, Hollystraße 1, 06114, Halle (Saale), Germany. .,Department of Anatomy and Cell Biology, Martin Luther University Halle-Wittenberg, Grosse Steinstrasse 52 1, 06108, Halle (Saale), Germany.
| | - Rüdiger Horstkorte
- Institute for Physiological Chemistry, Martin Luther University Halle-Wittenberg, Hollystraße 1, 06114, Halle (Saale), Germany
| | | | - Jörg Harth
- Department of Transfusion Medicine, University Hospital Halle (Saale), Ernst-Grube-Straße 40, 06097, Halle (Saale), Germany
| | - Heike Kielstein
- Department of Anatomy and Cell Biology, Martin Luther University Halle-Wittenberg, Grosse Steinstrasse 52 1, 06108, Halle (Saale), Germany
| |
Collapse
|
2
|
Madge PD, Maggioni A, Pascolutti M, Amin M, Waespy M, Bellette B, Thomson RJ, Kelm S, von Itzstein M, Haselhorst T. Structural characterisation of high affinity Siglec-2 (CD22) ligands in complex with whole Burkitt's lymphoma (BL) Daudi cells by NMR spectroscopy. Sci Rep 2016; 6:36012. [PMID: 27808110 PMCID: PMC5093622 DOI: 10.1038/srep36012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Accepted: 10/10/2016] [Indexed: 12/13/2022] Open
Abstract
Siglec-2 undergoes constitutive endocytosis and is a drug target for autoimmune diseases and B cell-derived malignancies, including hairy cell leukaemia, marginal zone lymphoma, chronic lymphocytic leukaemia and non-Hodgkin's lymphoma (NHL). An alternative to current antibody-based therapies is the use of liposomal nanoparticles loaded with cytotoxic drugs and decorated with Siglec-2 ligands. We have recently designed the first Siglec-2 ligands (9-biphenylcarboxamido-4-meta-nitrophenyl-carboxamido-Neu5Acα2Me, 9-BPC-4-mNPC-Neu5Acα2Me) with simultaneous modifications at C-4 and C-9 position. In the current study we have used Saturation Transfer Difference (STD) NMR spectroscopy to monitor the binding of 9-BPC-4-mNPC-Neu5Acα2Me to Siglec-2 present on intact Burkitt's lymphoma Daudi cells. Pre-treatment of cells with periodate resulted in significantly higher STD NMR signal intensities for 9-BPC-4-mNPC-Neu5Acα2Me as the cells were more susceptible to ligand binding because cis-binding on the cell surface was removed. Quantification of STD NMR effects led to a cell-derived binding epitope of 9-BPC-4-mNPC-Neu5Acα2Me that facilitated the design and synthesis of C-2, C-3, C-4 and C-9 tetra-substituted Siglec-2 ligands showing an 88-fold higher affinity compared to 9-BPC-Neu5Acα2Me. This is the first time a NMR-based binding study of high affinity Siglec-2 (CD22) ligands in complex with whole Burkitt's lymphoma Daudi cells has been described that might open new avenues in developing tailored therapeutics and personalised medicine.
Collapse
Affiliation(s)
- Paul D Madge
- Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222, Australia
| | - Andrea Maggioni
- Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222, Australia
| | - Mauro Pascolutti
- Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222, Australia
| | - Moein Amin
- Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222, Australia
| | - Mario Waespy
- Centre for Biomolecular Interactions Bremen, Department of Biology and Chemistry, University of Bremen, 28334 Bremen, Germany
| | - Bernadette Bellette
- Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222, Australia
| | - Robin J Thomson
- Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222, Australia
| | - Sørge Kelm
- Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222, Australia.,Centre for Biomolecular Interactions Bremen, Department of Biology and Chemistry, University of Bremen, 28334 Bremen, Germany
| | - Mark von Itzstein
- Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222, Australia
| | - Thomas Haselhorst
- Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222, Australia
| |
Collapse
|
3
|
Paulson JC, Macauley MS, Kawasaki N. Siglecs as sensors of self in innate and adaptive immune responses. Ann N Y Acad Sci 2012; 1253:37-48. [PMID: 22288608 DOI: 10.1111/j.1749-6632.2011.06362.x] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Siglecs are expressed on most white blood cells of the immune system and are known to modulate the activity of cell signaling receptors via regulatory motifs in their cytoplasmic domains. This immunoglobulin subfamily of coreceptors recognize sialic acid containing glycans as ligands, which are found on glycoproteins and glycolipids of all mammalian cells. By virtue of their ability to recognize this common structural element, siglecs are increasingly recognized for their ability to help immune cells distinguish between self and nonself, and dampen autoimmune responses.
Collapse
Affiliation(s)
- James C Paulson
- Department of Chemical Physiology, The Scripps Research Institute, La Jolla, California 92037, USA.
| | | | | |
Collapse
|
4
|
Nydegger UE, Tevaearai H, Berdat P, Rieben R, Carrel T, Mohacsi P, Flegel WA. Histo-blood group antigens as allo- and autoantigens. Ann N Y Acad Sci 2005; 1050:40-51. [PMID: 16014519 DOI: 10.1196/annals.1313.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The science of blood groups has made giant steps forward during the last decade. Blood-group typing of red blood cells (RBCs) is performed on more than 15 million samples per year in Europe, today much less often for forensic reasons than for clinical purposes such as transfusion and organ transplantation. Specific monoclonal antibodies are used with interpretation on the basis of RBC agglutination patterns, and mass genotyping may well be on its way to becoming a routine procedure. The discovery that most blood group systems, whose antigens are by definition found on RBCs, are also expressed in multiple other tissues has sparked the interest of transplantation medicine in immunohematology beyond the HLA system. The one and only "histo-blood group" (HBG) system that is routinely considered in transplantation medicine is ABO, because ABO antigen-incompatible donor/recipient constellations are preferably avoided. However, other HBG systems may also play a role, thus far underestimated. This paper is an up-to-date analysis of the importance of HBG systems in the alloimmunity of transplantation and autoimmune events, such as hemolytic anemia.
Collapse
Affiliation(s)
- Urs E Nydegger
- Clinic for Cardiovascular Surgery, Inselspital, CH-3010 Bern, Switzerland.
| | | | | | | | | | | | | |
Collapse
|
5
|
Abstract
Animal glycan-recognizing proteins can be broadly classified into two groups-lectins (which typically contain an evolutionarily conserved carbohydrate-recognition domain [CRD]) and sulfated glycosaminoglycan (SGAG)-binding proteins (which appear to have evolved by convergent evolution). Proteins other than antibodies and T-cell receptors that mediate glycan recognition via immunoglobulin (Ig)-like domains are called "I-type lectins." The major homologous subfamily of I-type lectins with sialic acid (Sia)-binding properties and characteristic amino-terminal structural features are called the "Siglecs" (Sia-recognizing Ig-superfamily lectins). The Siglecs can be divided into two groups: an evolutionarily conserved subgroup (Siglecs-1, -2, and -4) and a CD33/Siglec-3-related subgroup (Siglecs-3 and -5-13 in primates), which appear to be rapidly evolving. This article provides an overview of historical and current information about the Siglecs.
Collapse
Affiliation(s)
- Ajit Varki
- Research Center for Glycoscience, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan.
| | | |
Collapse
|