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sialyltransferase

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https://www.readbyqxmd.com/read/28717006/extrinsic-sialylation-is-dynamically-regulated-by-systemic-triggers-in-vivo
#1
Charles T Manhardt, Patrick R Punch, Christopher W L Dougher, Joseph T Y Lau
Recent reports documented that extracellular sialyltransferases can remodel both cell surface and secreted glycans by a process other than the canonical cell-autonomous glycosylation that occurs within the intracellular secretory apparatus. Despite association of the abundance of these extracellular sialyltransferases, particularly ST6Gal-1, with disease states such as cancer and a variety of inflammatory conditions, the prevalence of this extrinsic glycosylation pathway in vivo remains unknown. Here we observed no significant extrinsic sialylation in resting mice, suggesting that extrinsic sialylation is not a constitutive process...
July 17, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28687873/%C3%AE-2-6-linked-sialic-acid-serves-as-a-high-affinity-receptor-for-cancer-oncolytic-virotherapy-with-newcastle-disease-virus
#2
Qian Li, Ding Wei, Fei Feng, Xi-Long Wang, Can Li, Zhi-Nan Chen, Huijie Bian
PURPOSE: Newcastle disease virus (NDV) has been applied to oncolytic virotherapy for decades due to its naturally oncolytic property. In spite of the substantiation of the sialic acid receptors of NDV on host cells, knowledge of preference of sialic acid linkage in viral attachment and oncolytic effect is lacking and imperative to be elucidated. METHODS: Surface plasmon resonance analysis and competitive inhibition with sialylated glycan receptor analogues were used to determine the affinity and the preference of sialic acid receptor...
July 7, 2017: Journal of Cancer Research and Clinical Oncology
https://www.readbyqxmd.com/read/28681122/lewis-x-antigen-is-associated-to-head-and-neck-squamous-cell-carcinoma-survival
#3
Martín E Rabassa, Adrian Pereyra, Liliana Pereyra, Amada Segal-Eiras, Martín C Abba, Maria V Croce
Head and neck squamous cell carcinoma (HNSCC) is an aggressive disease with poor prognosis without appropriate prognostic markers. Previous research shows that Lewis antigens have been involved in carcinoma dissemination and patients´ survival. Fucosyl and sialyltransferases are the enzymes implicated in the Lewis antigens synthesis. The purpose of this study was to evaluate the prognostic utility of Lewis antigens in HNSCC. We conducted a prospective research including histological samples from 79 patients with primary HNSCC...
July 5, 2017: Pathology Oncology Research: POR
https://www.readbyqxmd.com/read/28553930/%C3%AE-2-6-sialylation-mediates-hepatocellular-carcinoma-growth-in-vitro-and-in-vivo-by-targeting-the-wnt-%C3%AE-catenin-pathway
#4
Y Zhao, A Wei, H Zhang, X Chen, L Wang, H Zhang, X Yu, Q Yuan, J Zhang, S Wang
Abnormal sialylation due to overexpression of sialyltransferases has been associated with tumorigenesis and tumor progression. Although ST6Gal-I influences cancer persistence and progression by affecting various receptors, the underlying mechanisms and mediators remain largely obscure, especially in hepatocellular carcinoma (HCC). We found that ST6Gal-I expression was markedly upregulated in HCC tissues and cells, high levels being associated with aggressive phenotype and poor prognosis. Furthermore, we examined the roles and mechanisms of ST6Gal-I in HCC tumorigenesis and metastasis in vitro and in vivo...
May 29, 2017: Oncogenesis
https://www.readbyqxmd.com/read/28550122/the-blood-borne-sialyltransferase-st6gal-1-is-a-negative-systemic-regulator-of-granulopoiesis
#5
Christopher W L Dougher, Alexander Buffone, Michael J Nemeth, Mehrab Nasirikenari, Eric E Irons, Paul N Bogner, Joseph T Y Lau
Responding to systemic demands in producing and replenishing end-effector blood cells is predicated on the appropriate delivery and interpretation of extrinsic signals to the HSPCs. The data presented herein implicate the systemic, extracellular form of the glycosyltransferase ST6Gal-1 in the regulation of late-stage neutrophil development. ST6Gal-1 is typically a membrane-bound enzyme sequestered within the intracellular secretory apparatus, but an extracellular form is released into the blood from the liver...
May 26, 2017: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/28537895/interaction-of-glycosphingolipids-gd3-and-gd2-with-growth-factor-receptors-maintains-breast-cancer-stem-cell-phenotype
#6
Yuh-Jin Liang, Chen-Yu Wang, I-An Wang, Yi-Wen Chen, Li-Tzu Li, Chuang-Yu Lin, Ming-Yi Ho, Tsung-Lung Chou, Ya-Hui Wang, Shih-Pin Chiou, Yu-Ju Lin, John Yu
Many studies have suggested that disialogangliosides, GD2 and GD3, are involved in the development of various tumor types. However, the functional relationships between ganglioside expression and cancer development or aggressiveness are not fully described. GD3 is upregulated in approximately half of all invasive ductal breast carcinoma cases, and enhanced expression of GD3 synthase (GD3S, alpha-N-acetylneuraminide alpha-2,8-sialyltransferase) in estrogen receptor-negative breast tumors, was shown to correlate with reduced overall patient survival...
May 7, 2017: Oncotarget
https://www.readbyqxmd.com/read/28512058/downregulation-of-mir-224-and-let-7i-contribute-to-cell-survival-and-chemoresistance-in-chronic-myeloid-leukemia-cells-by-regulating-st3gal-iv-expression
#7
Huimin Zhou, Yang Li, Bing Liu, Yujia Shan, Yan Li, Lifen Zhao, Zhen Su, Jia Li
Acquired resistance to imatinib is frequently associated with poor clinical outcome of chronic myeloid leukemia (CML) patient. To date, evidence indicates that protein glycosylation and its upstream regulators might be implicated in tumorigenesis and chemoresistance occurrence. In current study we initially explored N-glycan profiles on the surface of CML cell lines and bone marrow mononuclear cells (BMMC) of CML patients by using mass spectrometry (MS) analysis. An elevated sialylation was detected in K562R cells (CML cells with imatinib resistance phenotype) compare to K562 cells...
May 13, 2017: Gene
https://www.readbyqxmd.com/read/28500031/labeling-glycans-on-living-cells-by-a-chemoenzymatic-glycoengineering-approach
#8
Ruben T Almaraz, Yanhong Li
Structural glycobiology has traditionally been a challenging field due to a limited set of tools available to investigate the diverse and complex glycan molecules. However, we cannot ignore that glycans play critical roles in health as well as in disease, and are present in more than 50% of all proteins and on over 80% of all surface proteins. Chemoenzymatic glycoengineering (CGE) methods are a powerful set of tools to synthesize complex glycans, but the full potential of these methods have not been explored in cell biology yet...
June 15, 2017: Biology Open
https://www.readbyqxmd.com/read/28474804/active-site-his85-of-pasteurella-dagmatis-sialyltransferase-facilitates-productive-sialyl-transfer-and-so-prevents-futile-hydrolysis-of-cmp-neu5ac
#9
Katharina Schmölzer, Manuel Eibinger, Bernd Nidetzky
Sialyltransferases of the GT-80 glycosyltransferase family are considered multifunctional because of the array of activities detected. They exhibit glycosyl transfer, trans-sialylation, and hydrolysis activities. How these enzymes utilize their active-site residues in balancing the different enzymatic activities is not well understood. In this study of Pasteurella dagmatis α2,3sialyltransferase, we show that the conserved His85 controls efficiency and selectivity of the sialyl transfer. A His85→Asn variant was 200 times less efficient than wild-type for sialylation of lactose, and exhibited relaxed site selectivity to form not only the α2,3- but also the α2,6-sialylated product (21 %)...
May 5, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28467974/expression-of-sialyl-tn-sugar-antigen-in-bladder-cancer-cells-affects-response-to-bacillus-calmette-gu%C3%A3-rin-bcg-and-to-oxidative-damage
#10
Paulo F Severino, Mariana Silva, Mylene Carrascal, Nadia Malagolini, Mariella Chiricolo, Giulia Venturi, Annalisa Astolfi, Mariangela Catera, Paula A Videira, Fabio Dall'Olio
The sialyl-Tn (sTn) antigen is an O-linked carbohydrate chain aberrantly expressed in bladder cancer (BC), whose biosynthesis is mainly controlled by the sialyltransferase ST6GALNAC1. Treatment with Bacillus Calmette-Guérin (BCG) is the most effective adjuvant immunotherapy for superficial BC but one third of the patients fail to respond. A poorly understood correlation between the expression of sTn and BC patient's response to BCG was previously observed. By analyzing tumor tissues, we showed that patients with high ST6GALNAC1 and IL-6 mRNA expression were BCG responders...
April 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/28465212/cell-culture-media-supplemented-with-raffinose-reproducibly-enhances-high-mannose-glycan-formation
#11
David Brühlmann, Anais Muhr, Rebecca Parker, Thomas Vuillemin, Blanka Bucsella, Franka Kalman, Serena Torre, Fabio La Neve, Antonio Lembo, Tobias Haas, Markus Sauer, Jonathan Souquet, Hervé Broly, Jürgen Hemberger, Martin Jordan
Glycosylation plays a pivotal role in pharmacokinetics and protein physiochemical characteristics. In particular, effector functions including antibody-dependent cell-mediated cytotoxicity (ADCC) can be desired, and it has been described that high-mannose species exhibited enhanced ADCC. In this work we present the trisaccharide raffinose as a novel cell culture medium supplement to promote high mannose N-glycans in fed-batch cultures, which is sought after in the development of biosimilars to match the quality profile of the reference medicinal product (RMP) also...
April 29, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28460336/application-of-surface-enhanced-raman-spectroscopy-as-a-diagnostic-system-for-hypersialylated-metastatic-cancers
#12
Babita Shashni, Yukichi Horiguchi, Kosuke Kurosu, Hitoshi Furusho, Yukio Nagasaki
Early diagnosis of metastatic cancers could greatly limit the number of cancer-associated deaths. Aberrant surface expression of sialic acid (hypersialylation) on tumors correlating with metastatic incidence and its involvement in tumorigenesis and progression is widely reported; hence detection of hypersialylated tumors may be an effective strategy to identify metastatic cancers. We herein report on the application of phenylboronic acid-installed PEGylated gold nanoparticles coupled with Toluidine blue O (T/BA-GNPs) as SERS probes to target surface sialic acid (N-acetylneuraminic acid, Neu5Ac)...
April 21, 2017: Biomaterials
https://www.readbyqxmd.com/read/28439107/e-selectin-ligands-recognised-by-heca452-induce-drug-resistance-in-myeloma-which-is-overcome-by-the-e-selectin-antagonist-gmi-1271
#13
A Natoni, T A G Smith, N Keane, C McEllistrim, C Connolly, A Jha, M Andrulis, E Ellert, M S Raab, S V Glavey, L Kirkham-McCarthy, S K Kumar, S C Locatelli-Hoops, I Oliva, W E Fogler, J L Magnani, M E O'Dwyer
Multiple Myeloma (MM) is characterized by the clonal expansion and metastatic spread of malignant plasma cells to multiple sites in the bone marrow (BM). Recently, we implicated the sialyltransferase ST3Gal-6, an enzyme critical to the generation of E-selectin ligands, in MM BM homing and resistance to therapy. Since E-selectin is constitutively expressed in the BM microvasculature, we wished to establish the contribution of E-selectin ligands to MM biology. We report that functional E-selectin ligands are restricted to a minor subpopulation of MM cell lines which, upon expansion, demonstrate specific and robust interaction with recombinant E-selectin in vitro...
April 25, 2017: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/28427206/mir-146a-and-mir-146b-promote-proliferation-migration-and-invasion-of-follicular-thyroid-carcinoma-via-inhibition-of-st8sia4
#14
Wei Ma, Xuzi Zhao, Leilei Liang, Guangzhi Wang, Yanyan Li, Xiaolong Miao, Yongfu Zhao
Follicular thyroid carcinoma (FTC) is a more aggressive form of thyroid cancer than the common papillary type. Alpha-2,8-sialyltransferase (ST8SIA) family members are expressed in various cancers and may be associated with FTC progression. In this study, we measured ST8SIA family expression in two FTC cell lines with different invasive potentials (FTC-133 and FTC-238) and Nthy-ori 3-1 cell lines, as well as FTC and normal thyroid tissues. ST8SIA4 was downregulated in the highly invasive FTC-238 cells and FTC tissues...
April 25, 2017: Oncotarget
https://www.readbyqxmd.com/read/28423672/%C3%AE-2-3-sialyltransferase-type-i-regulates-migration-and-peritoneal-dissemination-of-ovarian-cancer-cells
#15
Kuo-Chang Wen, Pi-Lin Sung, Shie-Liang Hsieh, Yu-Ting Chou, Oscar Kuang-Sheng Lee, Cheng-Wen Wu, Peng-Hui Wang
Epithelial ovarian cancer (EOC) has the highest mortality rate among gynecologic cancers due to advanced stage presentation, peritoneal dissemination, and refractory ascites at diagnosis. We investigated the role of α2,3-sialyltransferase type I (ST3GalI) by analyzing human ovarian cancer datasets and human EOC tissue arrays. We found that high expression of ST3GalI was associated with advanced stage EOC. Transwell migration and cell invasion assays showed that high ST3GalI expression enhanced migration of EOC cells...
April 25, 2017: Oncotarget
https://www.readbyqxmd.com/read/28413949/the-intrinsic-relationship-between-structure-and-function-of-the-sialyltransferase-st8sia-family-members
#16
Ri-Bo Huang, D Cheng, Bo Lu, S M Liao, Frederic A Troy Ii, Guo-Ping Zhou
As a subset of glycosyltransferases, the family of sialyltransferases catalyze transfer of sialic acid (Sia) residues to terminal non-reducing positions on oligosaccharide chains of glycoproteins and glycolipids, utilizing CMP-Neu5Ac as the activated sugar nucleotide donor. In the four known sialyltransferase families (ST3Gal, ST6Gal, ST6GalNAc and ST8Sia), the ST8Sia family catalyzes synthesis of si,8-linked sialic/polysialic acid (polySia) chains according to their acceptor specificity. We have determined 3D structural models of the ST8Sia family members, designated ST8Sia I(1), II(2), IV(4), V(5), and VI(6) using the Phyre2 server...
April 14, 2017: Current Topics in Medicinal Chemistry
https://www.readbyqxmd.com/read/28413120/endosome-to-trans-golgi-network-transport-of-proprotein-convertase-7-is-mediated-by-a-cluster-of-basic-amino-acids-and-palmitoylated-cysteines
#17
Jeroen Declercq, Bruno Ramos-Molina, Ragna Sannerud, Bas Brouwers, Vincent P E G Pruniau, Sandra Meulemans, Evelyn Plets, Wim Annaert, John W M Creemers
Proprotein Convertase 7 (PC7) is a Furin-like endoprotease that cleaves precursor proteins at basic amino acids. PC7 is concentrated in the trans-Golgi network (TGN) but it shuttles between the plasma membrane and the TGN depending on sequences in the cytoplasmic tail. A short region containing a three amino acids motif, P(724)-L(725)-C(726), is essential and sufficient for internalization of PC7 but not for TGN localization, which requires the additional presence of the juxtamembrane region. In this study we have investigated the contribution of a cluster of basic amino acids and two reversibly palmitoylated cysteine residues to endocytic trafficking...
April 7, 2017: European Journal of Cell Biology
https://www.readbyqxmd.com/read/28395125/probing-the-cmp-sialic-acid-donor-specificity-of-two-human-%C3%AE-d-galactoside-sialyltransferases-st3gal%C3%A2-i-and-st6gal%C3%A2-i-selectively-acting-on-o-and-n-glycosylproteins
#18
Maxence Noel, Pierre-André Gilormini, Virginie Cogez, Nao Yamakawa, Dorothée Vicogne, Cédric Lion, Christophe Biot, Yann Guérardel, Anne Harduin-Lepers
Sialylation of glycoproteins and glycolipids is catalyzed by sialyltransferases in the Golgi of mammalian cells, whereby sialic acid residues are added at the nonreducing ends of oligosaccharides. Because sialylated glycans play critical roles in a number of human physio-pathological processes, the past two decades have witnessed the development of modified sialic acid derivatives for a better understanding of sialic acid biology and for the development of new therapeutic targets. However, nothing is known about how individual mammalian sialyltransferases tolerate and behave towards these unnatural CMP-sialic acid donors...
July 4, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28382513/rna-splicing-and-splicing-regulator-changes-in-prostate-cancer-pathology
#19
REVIEW
Jennifer Munkley, Karen Livermore, Prabhakar Rajan, David J Elliott
Changes in mRNA splice patterns have been associated with key pathological mechanisms in prostate cancer progression. The androgen receptor (abbreviated AR) transcription factor is a major driver of prostate cancer pathology and activated by androgen steroid hormones. Selection of alternative promoters by the activated AR can critically alter gene function by switching mRNA isoform production, including creating a pro-oncogenic isoform of the normally tumour suppressor gene TSC2. A number of androgen-regulated genes generate alternatively spliced mRNA isoforms, including a prostate-specific splice isoform of ST6GALNAC1 mRNA...
April 5, 2017: Human Genetics
https://www.readbyqxmd.com/read/28367091/disialyl-gd2-ganglioside-suppresses-icam-1-mediated-invasiveness-in-human-breast-cancer-mda-mb231-cells
#20
Kyung-Min Kwon, Tae-Wook Chung, Choong-Hwan Kwak, Hee-Jung Choi, Kyung-Woon Kim, Sun-Hyung Ha, Seung-Hak Cho, Young-Choon Lee, Ki-Tae Ha, Moon-Jo Lee, Cheorl-Ho Kim
The disialoganglioside GD3 has been considered to be involved in tumor progression or suppression in various tumor cells. However, the significance of the biological functions of GD3 in breast cancer cells is still controversial. This prompted us to study the possible relationship(s) between GD3 expression and the metastatic potential of a breast cancer MDA-MB231 cells as an estrogen receptor negative (ER-) type. The human GD3 synthase cDNA was transfected into MDA-MB231 cells, and G-418 bulk selection was used to select cells stably overexpressing the GD3 synthase...
2017: International Journal of Biological Sciences
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