151
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Abstract
Brain dysmorphogenesis and persistent psychomotor disturbances are hallmarks of developmental methylmercury (MeHg) exposure, but the molecular mechanisms underlying these effects are poorly understood. Targets of developmental MeHg exposure include neural cell adhesion molecules (NCAMs), sialoglycoconjugate molecules whose proper temporal and spatial expression is important at all stages of neurodevelopment and especially during synaptic structuring. To investigate the effects of MeHg on the temporal expression of NCAM during development, rat pups were dosed with 7.0 mg/kg MeHgCl (s.c.) on alternate days from postnatal days (PNDs) 3-13 and killed on PNDs 15, 30 and 60. Brain MeHg concentrations were determined in a subset of litters injected with CH(3)203Hg. Expression of NCAM180 protein and of NCAM180 polysialylation was examined in whole cerebellum homogenates, cerebellar synaptosomes and isolated cerebellar growth cones by Western blotting and immunocytochemical staining. NCAM sialyltransferase activity was assayed in preparations of purified Golgi apparatus from the cerebelli of rats treated in vivo, or following in vitro incubation with 0, 1, 2.5, or 7.5 microM MeHg for 2 h. At PND15, no change in NCAM180 protein expression was observed in any cerebellar preparations, but decreased polysialylation of NCAM180 was observed in cerebellar whole homogenates, synaptosomes and isolated growth cones. At PND30, both NCAM180 protein expression and NCAM180 polysialylation were elevated in whole homogenate preparations but not in synaptosomes. NCAM180 expression in MeHg-treated rats was similar to controls at PND60, 47 days after the last methylmercury administration. In vivo studies of cerebellar Golgi sialyltransferase activity revealed significant reductions in PND15 MeHg-treated rats as compared to controls, but no changes in sialyltransferase activity in PND30 and PND60 animals. In vitro experiments revealed decreasing sensitivity of cerebellar sialyltransferases to MeHg as the developmental age of the rat increased. Toxic perturbation of the developmentally-regulated expression of polysialylated NCAM during brain formation may disturb the stereotypic formation of neuronal contacts and could contribute to the behavioral and morphological disturbances observed following MeHg poisoning.
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Affiliation(s)
- P M Dey
- Neurotoxicology Laboratories, Department of Pharmacology and Toxicology, Rutgers College of Pharmacy, Piscataway, NJ 08854-0789, USA
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152
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Park YI, Wood HA, Lee YC. Monosaccharide compositions of Danaus plexippus (monarch butterfly) and Trichoplusia ni (cabbage looper) egg glycoproteins. Glycoconj J 1999; 16:629-38. [PMID: 10972141 DOI: 10.1023/a:1007029017400] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Monosaccharide compositions of eggs from Danaus plexippus (monarch butterfly) and Trichoplusia ni (cabbage looper) were analyzed. Analyses were performed mainly with high performance anion exchange chromatography (HPAEC) using crude extracts of eggs or SDS-PAGE separated and PVDF-blotted protein bands. Man and GlcN were the major components in all cases, but low levels of Gal and Fuc were possibly present in some samples. Some T. ni egg glycoproteins even contained GalN. Although a peak comigrating with Neu5Ac could be detected with HPAEC-PAD or RP-HPLC (fluorometry) after derivatization with 1,2-diamino-4,5-methylenedioxy-benzene, the quantities were too small to be significant as an integral part of the analyzed glycoproteins. These data suggests that most of glycans on the glycoproteins are pauci-Man type N-glycans, but a small portion of N-glycan may be either hybrid type or complex type.
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Affiliation(s)
- Y I Park
- Biology Department, Johns Hopkins University, Baltimore, Maryland 21218, USA
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153
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Diamantopoulou S, Stagiannis KD, Vasilopoulos K, Barlas P, Tsegenidis T, Karamanos NK. Importance of high-performance liquid chromatographic analysis of serum N-acylneuraminic acids in evaluating surgical treatment in patients with early endometrial cancer. J Chromatogr B Biomed Sci Appl 1999; 732:375-81. [PMID: 10517360 DOI: 10.1016/s0378-4347(99)00304-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The objectives of this study were the quantification of the two major sialic acid (Sia) forms - N-acetylneuraminic (Neu5Ac) and N-glycolylneuraminic acids (Neu5Gc) - in serum before and after surgical treatment of early endometrial cancer and the relation of their levels with the progress of surgical therapy. The major Sia forms were liberated from sera glycoconjugates by mild acid hydrolysis, separated as per-O-benzoylated derivatives by a highly sensitive reversed-phase HPLC method and detected at 231 nm. Total Sia content in sera of healthy women was not related to age and body weight. Neu5Ac was identified as the major Sia in sera from both cancer patients, healthy individuals as well as in tissue specimens (> or = 94% of total Sia). In patients with endometrial cancer the total Sia level before surgical treatment (709.5 +/- 306.5 mg/l) was significantly higher (p < or = 0.0001) than that of the control group (213.5 +/- 88.7 mg/l). The elevation in Sia level was exclusively due to Neu5Ac. Following surgical therapy, serum Neu5Ac levels (699.4 +/- 305.6 mg/l) were significantly decreased (305.9 +/- 114.5 mg/l). In one case, where Neu5Ac level was increased 15 days and eight months after surgery (1.8 and 2.5 times as compared to control, respectively), a metastasis not detected during surgery was recorded. The obtained results suggest that Neu5Ac level in serum may be used as a tumor marker in evaluating the suitability of surgical treatment in early endometrial cancer.
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154
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Keirstead HS, Ben-Hur T, Rogister B, O'Leary MT, Dubois-Dalcq M, Blakemore WF. Polysialylated neural cell adhesion molecule-positive CNS precursors generate both oligodendrocytes and Schwann cells to remyelinate the CNS after transplantation. J Neurosci 1999; 19:7529-36. [PMID: 10460259 PMCID: PMC6782511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/1999] [Revised: 06/03/1999] [Accepted: 06/14/1999] [Indexed: 02/13/2023] Open
Abstract
Transplantation offers a means of identifying the differentiation and myelination potential of early neural precursors, features relevant to myelin regeneration in demyelinating diseases. In the postnatal rat brain, precursor cells expressing the polysialylated (PSA) form of the neural cell adhesion molecule NCAM have been shown to generate mostly oligodendrocytes and astrocytes in vitro (Ben-Hur et al., 1998). Immunoselected PSA-NCAM+ newborn rat CNS precursors were expanded as clusters with FGF2 and grafted into a focal demyelinating lesion in adult rat spinal cord. We show that these neural precursors can completely remyelinate such CNS lesions. While PSA-NCAM+ precursor clusters contain rare P75+ putative neural crest precursors, they do not generate Schwann cells in vitro even in the presence of glial growth factor. Yet they generate oligodendrocytes, astrocytes, and Schwann cells in vivo when confronted with demyelinated axons in a glia-free area. We confirmed the transplant origin of these Schwann cells using Y chromosome in situ hybridization and immunostaining for the peripheral myelin protein P0 of tissue from female rats that had been grafted with male cell clusters. The number and distribution of Schwann cells within remyelinated tissue, and the absence of P0 mRNAs in donor cells, indicated that Schwann cells were generated by expansion and differentiation of transplanted PSA-NCAM+ neural precursors and were not derived from contaminating Schwann cells. Thus, transplantation into demyelinated CNS tissue reveals an unexpected differentiation potential of a neural precursor, resulting in remyelination of CNS axons by PNS and CNS myelin-forming cells.
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Affiliation(s)
- H S Keirstead
- Medical Research Council Cambridge Centre for Brain Repair and Department of Clinical Veterinary Medicine, Cambridge, United Kingdom CB3 0ES
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155
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Abstract
The granule cell layer of the adult dentate gyrus possesses two characteristics of an immature nervous system. The first is that granule cells continue to be generated in the innermost region of the granule cell layer, and newly generated and developing granule cells in the adult express highly polysialylated neural cell adhesion molecule (PSA-NCAM). PSA-NCAM-expressing apical dendrites have dynamically unstable processes such as irregular shafts and many stick-like or fan-shaped fine processes. The second is that radial glia-like cells expressing glial fibrillary acidic protein (GFAP) remain in a similar region of the granular layer. The numbers of PSA-NCAM-expressing granule cells and GFAP-expressing radial glia-like cells show a parallel age-dependent decrease during aging. Moreover, by using confocal laser scanning microscopy and immunoelectron microscopy, we demonstrated that PSA-NCAM-expressing dendrites and GFAP-expressing radial processes are partly in contact with each other, and occasionally the radial glial processes envelop the PSA-NCAM-positive dendritic processes. The temporal and spatial relationship between the two immature elements suggests that the processes of the radial glia-like cells are closely associated with the dendritic growth of the newly generated granule cells in the adult dentate gyrus and that these two immature features of neurons and glia in the dentate gyrus diminish with age.
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Affiliation(s)
- T Seki
- Department of Anatomy, Juntendo University School of Medicine, Tokyo, Japan.
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156
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Karlsson H, Johansson L, Miller-Podraza H, Karlsson KA. Fingerprinting of large oligosaccharides linked to ceramide by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry: highly heterogeneous polyglycosylceramides of human erythrocytes with receptor activity for Helicobacter pylori. Glycobiology 1999; 9:765-78. [PMID: 10406842 DOI: 10.1093/glycob/9.8.765] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Highly microheterogeneous polyglycosylceramides (PGCs) of human erythrocytes with an average composition of about 25 monosaccharides linked to ceramide were analyzed by matrix-assisted laser desorption-ionization time-of-flight mass spectrometry (MALDI-TOF MS). The human gastric pathogen Helicobacter pylori was earlier shown to bind this glycosphingolipid mixture by thin-layer chromatogram binding assay. The receptor activity was present along the whole nonresolved chromatographic interval. Mass spectra of intact PGCs were compared with corresponding spectra of oligosaccharides enzymatically released from the ceramides. Two subfractions of PGCs containing less than one and more than one sialic acid residue per molecule were used. MALDI-MS spectra were recorded in both linear and reflectron mode with the accuracies of </=0.08% and </=0.02%, respectively, which allowed determination of the constituent parts of the detected ions in form of ceramide and number of hexoses, N-acetylhexosamines, fucoses and sialic acids. Molecular species were found based on ceramide with mainly sphingosine and fatty acids 24:0 and 24:1 (with less amounts of 22:0), and with a total number of monosaccharides ranging from 11 (neutral, m/z = 2605 for [M+Na](+)) to 41 (one sialic acid, m/z = 8057 for [M-H](-)). The saccharide composition obtained supported a successively extended and branched N -acetyllactosamine core with substitutions of fucoses (0 up to 8) and sialic acid (0 to 1). The reliable molecular analysis of large oligosaccharides linked to ceramide using this approach will be of great help for the further structure analysis in order to define the epitope for the sialic acid-dependent binding by the bacterium.
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Affiliation(s)
- H Karlsson
- Institute of Medical Biochemistry, Göteborg University, P.O. Box 440, SE-405 30 Göteborg, Sweden
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157
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Lin SL, Inoue Y, Inoue S. Evaluation of high-performance anion-exchange chromatography with pulsed electrochemical and fluorometric detection for extensive application to the analysisof homologous series of oligo- and polysialic acids in bioactive molecules. Glycobiology 1999; 9:807-14. [PMID: 10406846 DOI: 10.1093/glycob/9.8.807] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Our previous studies have shown extensively diverse structures in oligo/polymers of sialic acid (oligo/polySia) that are expressed often in developmentally regulated manner on animal glycoconjugates. The aim of this study was to establish highlysensitive and specific methods that can be used to identify diverse types of oligo/polySia and thus can be applied to studies of biological phenomena associated with the differential expression of oligo/polySia chains with different degree of polymerization (DP). As model compounds, we analyzed five different homologous series of oligo/polySia, (-->8Neu5Acalpha2-->)(n), (-->9Neu 5Acalpha2-->)(n), (-->8Neu5Gcalpha2-->)(n), (-->5-O(glycolyl)-Neu5Gcalpha2-->)(n), and Neu5Gc9SO(4)alpha2-->(-->5-O(glycolyl)-Neu5Gcalpha2--> )(n), ()expressed in various biopolymers. The latter two structures have recently been identified in sea urchin egg receptor for sperm. First we examined application of high-performance anion-exchange chromatography (HPAEC) on a CarboPac PA-100 column with pulsed electrochemical detection (PED) to new types of oligo/polySiacompounds and confirmed that resolution of high polymers (DP >70) of sialic acids was remarkable as reported previously. However, there are limitations in sensitivity and selectivity in PED that become significant when material is available only in a minute amount or material contained a large proportion of protein. These limitations can be circumvented by fluorometric detection of oligo/polySia tagged with 1,2-diamino-4, 5-methyl-enedioxybenzene (DMB) at the reducing terminal residues after separation on a MonoQ HR5/5 column. The latter method can be applied to any type of oligo/polySia we examined if we choose the derivatization conditions and is more sensitive and specific than the method with PED for analysis of oligo/polySia with DP up to 25.
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Affiliation(s)
- S L Lin
- Institute of Biological Chemistry, Academia Sinica, Taipei 115, Taiwan, Republic of China
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158
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Nagao PE, Benchetrit LC. Virulent and avirulent strains of group B streptococci from Rio de Janeiro, Brazil: relationship between differences in surface hydrophobicity, sialic acid content and macrophage interaction. Mem Inst Oswaldo Cruz 1999; 94:497-8. [PMID: 10446008 DOI: 10.1590/s0074-02761999000400012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- P E Nagao
- Departamento de Biologia Celular e Genética, Instituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, 20550-013, Brasil.
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159
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Kimura Y, Manabe N, Nishihara S, Matsushita H, Tajima C, Wada S, Miyamoto H. Up-regulation of the alpha2,6-sialyltransferase messenger ribonucleic acid increases glycoconjugates containing alpha2, 6-linked sialic acid residues in granulosa cells during follicular atresia of porcine ovaries. Biol Reprod 1999; 60:1475-82. [PMID: 10330108 DOI: 10.1095/biolreprod60.6.1475] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
The sugar chains in cellular glycoconjugates have many biological functions. Extensive morphological development and remodeling occur in the ovary of female animals. This caused us to study glycobiological characteristics of ovarian cells, particularly granulosa cells that undergo apoptosis during follicular atresia. The lectin Sambucus sieboldiana agglutinin (SSA) specific for Siaalpha2,6Gal/GalNAc showed positive staining for granulosa cells only in atretic follicles of porcine ovaries by lectin histochemistry. Lectin blot analysis for SSA demonstrated specific glycoproteins only in atretic follicles. Furthermore, we performed analysis of backbone structures of SSA-positive glycans carried by granulosa cell glycoproteins increased during atresia by glycosidase treatment. Most of these structures were Siaalpha2,6Galbeta1,4GlcNAc on complex-type N-glycans, suggesting that only ST6Gal I of four distinct alpha2,6-sialyltransferases catalyzes alpha2,6-sialic acid transfer in most of the increased glycoproteins of granulosa cells during follicular atresia. Reverse transcription-polymerase chain reaction analysis demonstrated that the expression of ST6Gal I mRNA was up-regulated in granulosa cells during atresia. These results suggested that the alteration of glycoconjugates by ST6Gal I in granulosa cells during atresia is involved in some processes of ovarian follicular atresia and granulosa cell apoptosis.
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Affiliation(s)
- Y Kimura
- Unit of Anatomy and Cell Biology, Department of Animal Sciences, Kyoto University, Kyoto 606-8502, Japan
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160
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Kakehi K, Kinoshita M, Hayase S, Oda Y. Capillary electrophoresis of N-acetylneuraminic acid polymers and hyaluronic acid: correlation between migration order reversal and biological functions. Anal Chem 1999; 71:1592-6. [PMID: 10221077 DOI: 10.1021/ac981248y] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
High-resolution analysis of polymers of N-acetylneuraminic acid and hyaluronic acid was performed by capillary electrophoresis in a buffer containing a neutral polymer. Both polysaccharides having more than 100 monosaccharide residues were well separated into their molecular species by capillary electrophoresis using a combination of a chemically modified capillary and a buffer containing poly(ethylene glycol) as an additive. During optimization of the separation conditions, small oligomers of both polysaccharides were observed to migrate in the reverse order of their molecular masses on the electropherograms. However, oligomers larger than pentamer and decamer for N-acetylneuraminic acid polymers and hyaluronic acid, respectively, migrated in the order of their molecular masses. We propose that these unusual migration patterns are closely related to the stereochemical structures and the oligomer migrating the fastest is the minimum unit that forms the regular three-dimensional structure required for the biological function.
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Affiliation(s)
- K Kakehi
- Faculty of Pharmaceutical Sciences, Kinki University, Higashi-Osaka, Japan.
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161
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do Valle Matta MA, Sales Alviano D, dos Santos Silva Couceiro JN, Nazareth M, Meirelles L, Sales Alviano C, Angluster J. Cell-surface sialoglycoconjugate structures in wild-type and mutant Crithidia fasciculata. Parasitol Res 1999; 85:293-9. [PMID: 10099011 DOI: 10.1007/s004360050551] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
The cell-surface expression of sialoglycoconjugate structures in wild-type Crithidia fasciculata and its TFR(R1) drug-resistant mutant was analyzed with the aid of an influenza C virus strain, lectin, enzymatic treatment, and flow cytofluorimetry analysis probed with fluorescein isothiocyanate-labeled (FITC) lectins. 9-O-Acetyl-N-acetyl neuraminic acid (Neu5,9Ac2) structures mediate influenza C virus cell-binding. The SAalpha2,3Gal and SAalpha2,6Gal sequences are specifically recognized by Maackia amurensis (MAA) and Sambucus nigra (SNA) lectins, respectively. On the basis of these parameters the TFR(R1) mutant strain of C. fasciculata was found to contain exposed sialoglycoconjugates bearing Neu5,9Ac2 surface structures. After the removal of sialic acid residues by neuraminidase activity the marked increases in PNA (peanut agglutinin)-mediated agglutinating activity showed that those acidic units on C. fasciculata cells were glycosidically linked to D-galactose. The bond involves SAalpha2,6Gal and SAalpha2,3Gal linkages as suggested by the use of FITC-SNA and FITC-MAA lectins, respectively. Both SAalpha2,3Gal and SAalpha2,6Gal sequences were preferentially expressed by the TFR(R1) mutant. The SAalpha2,6 linkage markedly predominated. In the TFR(R1) mutant, but not in wild-type cells, two distinct populations of cells were distinguished by reactivity with FITC-SNA, one of which was enriched with surface SAalpha2,6Gal sequences. These diverse findings suggest that sialoglycoconjugate structures present on the flagellate surface may be associated with mutation and the cell growth cycle in C. fasciculata.
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Affiliation(s)
- M A do Valle Matta
- Departamento de Ultra-estrutura e Biologia Celular, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
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162
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Qian S, Li J, Gao J, Guo L, Ye J. [Preparation, purification and identification of sialic acid from Escherichia coli C-8]. Wei Sheng Wu Xue Bao 1999; 39:178-80. [PMID: 12555427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
Colominic acid produced from Escherichia coli C-8 was purified by ammonia sulfate precipitation, dialysis and concentration. After hydrolysis of colominic acid at a pH of 2.5, at 70 degrees C for 4 h, sialic acid was obtained, then purified by chromatography on Dowex1-x8. Analysis of thin-layer chromatography and absorption spectrum of sialic acid in the orcinol/Fe3+/HCl and the periodic acid/thiobarbituric acid confirmed that its purity was identical with that of standard sample.
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Affiliation(s)
- S Qian
- Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080
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163
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Abstract
The polysialylated neural cell adhesion molecule (PSA-NCAM) plays a role in axonal development and synaptic plasticity. Its pattern of expression is regulated temporally and topographically in the brain during development. However, it is unclear whether or not its subcellular location also changes. We have examined PSA-NCAM expression in relation to synapse formation in the developing rat striatum with immunohistochemistry and electron microscopy. Early in development, PSA-NCAM was present along the cytoplasmic membranes of neurons and in growth cones. PSA-NCAM expression became progressively confined to pre- and postsynaptic elements as neurons matured morphologically. Confirming previous results, a marked increase in the density of asymmetric synapses determined by using the physical dissector method was observed in the dorsolateral striatum between postnatal day 14 (P14) and P18. It was followed by a reduction between P18 and P25, when asymmetric synapse density reached adult levels. In contrast, the density of symmetric synapses had surpassed adult levels by P14. In the dorsomedial striatum, the density of asymmetric and symmetric synapses was similar at P18, at P25, and in adults. PSA-NCAM was associated with most asymmetric and symmetric synapses at P14 and P18 and was expressed in both pre- and postsynaptic elements of a majority (P14) or approximately half (P18) of the synapses. Most synapses lost PSA-NCAM expression between P18 and P25 in the dorsolateral striatum and between P25 and adult in the dorsomedial striatum. The data indicate that PSA-NCAM expression becomes restricted topographically during neuronal maturation but remains strategically associated with developing synapses during late postnatal development in the striatum.
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Affiliation(s)
- K Uryu
- Department of Pharmacology, University of Pennsylvania, Philadelphia 19104, USA
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164
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Johansson L, Johansson P, Miller-Podraza H. Detection by the lectins from Maackia amurensis and Sambucus nigra of 3- and 6-linked sialic acid in gangliosides with neolacto chains separated on thin-layer chromatograms and blotted to PVDF membranes. Anal Biochem 1999; 267:239-41. [PMID: 9918679 DOI: 10.1006/abio.1998.2982] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- L Johansson
- Institute of Medical Biochemistry, Göteborg University, Göteborg, SE-405 30,
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165
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Pfenninger A, Karas M, Finke B, Stahl B, Sawatzki G. Matrix optimization for matrix-assisted laser desorption/ionization mass spectrometry of oligosaccharides from human milk. J Mass Spectrom 1999; 34:98-104. [PMID: 10093211 DOI: 10.1002/(sici)1096-9888(199902)34:2<98::aid-jms767>3.0.co;2-n] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Neutral and acidic oligosaccharides from human milk were analyzed by matrix-assisted laser desorption/ionization mass spectrometry (MALDI/MS). These experiments require suitable matrices; their selection and particularly their preparation protocols must be optimized. Important criteria are sensitivity, reproducibility, tolerance against impurities and resolution over a wide mass range. For analytical investigations of these oligosaccharides, containing labile fucosylated and sialylated components, another property of a matrix becomes a significant factor, namely the influence on ion stability and the extent of (metastable) fragmentation. The experience gained with the MALDI/MS of neutral and acidic oligosaccharides is summarized taking into account different intentions of measurement and typical problems, such as impurities after enzymatic treatment. For a rapid screening of an oligosaccharide sample, superior results were obtained with a new preparation technique using 5-chloro-2-mercaptobenzothiazole (CMBT) as the first layer for 2,5-dihydroxybenzoic acid. For structural analysis by post-source decay, CMBT as the first layer for 3-aminoquinoline is a favoured preparation protocol, because extensive fragmentation is achieved. For acidic oligosaccharides, a special preparation protocol makes it possible to determine the number of sialic acids by inducing highly effective cationization. Matrix-assisted laser desorption/ionization mass spectrometry; matrices; oligosaccharides; post-source decay.
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Affiliation(s)
- A Pfenninger
- Division of Instrumental Analytical Chemistry, Johann Wolfgang Goethe University, Frankfurt/Main, Germany
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166
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Abstract
A method for quantitative analysis of monosaccharides including N-acetylneuraminic acid derived from sialic acid-containing oligosaccharides and glycoproteins is presented. The analysis is based on the combination of chemical and enzymatic methods coupled with capillary electrophoretic (CE) separation and laser-induced fluorescence (LIF) detection. The present method utilizes a simplified acid hydrolysis procedure consisting of mild hydrolysis (0.1 M TFA) to release sialic acid and strong acid hydrolysis (2.0 N TFA) to produce amino and neutral sugars. Amino sugars released from strong acid hydrolysis of oligosaccharides and glycoproteins were reacetylated and derivatized with 8-aminopyrene-1,3,6-trisulfonate (APTS) along with neutral sugars in the presence of sodium cyanoborohydride to yield quantitatively the highly stable fluorescent APTS adducts. N-acetylneuraminic acid (Neu5Ac), a major component of most mammalian glycoproteins, was converted in a fast specific reaction by the action of neuraminic acid aldolase (N-acylneuraminate pyruvate-lyase EC 4.1.3.3) to N-acetylmannosamine (ManNAc) and pyruvate. ManNAc was then derivatized with APTS in the same manner as the other monosaccharides. This method was demonstrated for the quantitation of pure Neu5Ac and the species derived from mild acid hydrolysis of 6'-sialyl-N-acetyllactosamine and bovine fetuin glycan. Quantitative recovery of the N-acetylmannosamine was obtained from a known amount of Neu5Ac in a mixture of seven other monosaccharides or from the sialylated oligosaccharides occurring in glycoproteins. The sequence of procedures consists of acid hydrolysis, enzymatic conversion and APTS derivatization which produced quantitative recovery of APTS-monosaccharide adducts. The detection limits for sugars derivatized with APTS and detected by CE-LIF are 100 pmol for Neu5Ac and 50 pmol for the other sugars.
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Affiliation(s)
- F T Chen
- Beckman Instruments, Inc., 4300 Harbor Boulevard D-14E, Fullerton, CA 92834, USA
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167
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Bhavanandan VP, Ringler NJ, Gowda DC. Identification of the glycosidically bound sialic acid in mucin glycoproteins that reacts as "free sialic acid" in the Warren assay. Glycobiology 1998; 8:1077-86. [PMID: 9751794 DOI: 10.1093/glycob/8.11.1077] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
A widely employed colorimetric assay for sialic acids based on periodate oxidation followed by reaction with thiobarbituric acid depends on the formation of a hexos-5-uluronic acid product, the pre-chromogen, by the periodate cleavage of the C6-C7, C7-C8, and C8-C9 bonds in free sialic acid. Glycosidically bound sialic acids are not expected to react in the assay since cleavage cannot occur between C6-C7 to yield the pre-chromogen. However, several investigators have reported the detection of a positive reaction by certain sialoglycoconjugates. In this study, it was found that various mucins but not other classes of sialoglycoconjugates or asialomucins exhibited this phenomenon. Of the mucins tested, ovine submaxillary mucin showed the maximum reactivity followed by the bovine and porcine counterparts. The disaccharide Neu5Acalpha2-->6 GalNAc(OH) released from mucins by alkaline borohydride treatment also reacted, albeit weakly compared to the native mucins, but other sialyl saccharides including 6'-sialyllactose and 6'-sialyl N -acetyllactosamine did not react. The positive reaction of the submaxillary mucins is not due to the presence of 3-deoxy-d-glycero-d-galacto-2-nonulosonic acid (KDN), a minor component in submaxillary mucins, or the release of sialic acid by the acidic condition of the assay. It is demonstrated that sialyl residues linked alpha2-->6 to unsubstituted N -acetylgalactosamine (sialyl Tn antigen structure) in mucin glycoproteins is responsible for the positive reaction. Apparently, periodate oxidation of the N -acetylgalactosamine residue leads to the release of sialic acid from the Neu5Acalpha2-->6 GalNAc linked to serine/threonine by an acid-catalyzed beta-elimination reaction. The findings provide a basis for the development of a chemical method to estimate sialyl Tn epitopes associated with cancer cells.
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Affiliation(s)
- V P Bhavanandan
- Department of Biochemistry and Molecular Biology, Milton S. Hershey Medical Center, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
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168
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Glüer S, Zense M, Radtke E, von Schweinitz D. Polysialylated neural cell adhesion molecule in childhood ganglioneuroma and neuroblastoma of different histological grade and clinical stage. Langenbecks Arch Surg 1998; 383:340-4. [PMID: 9860228 DOI: 10.1007/s004230050145] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND AND AIMS Neuroblastoma cells express the polysialylated form of the neural cell adhesion molecule (PSA-NCAM), which normally becomes restricted to a few neural regions after embryogenesis. The aim of the present study was to evaluate PSA-NCAM as a marker in childhood neuroblastoma. PATIENTS/METHODS We studied the expression of PSA-NCAM on tumor specimens and in sera of 27 children, altogether, with ganglioneuroma and neuroblastoma of different histological grades and clinical stages. For both methods, immunohistochemistry on 5-microm frozen sections and immunoluminescence serum assay, the polysialic-acid-specific monoclonal antibody 735 was used. RESULTS PSA-NCAM expression was highest in patients with undifferentiated neuroblastoma and advanced stages of disease, whereas children with differentiated tumor types and low clinical stages had distinctly reduced or no reactivity in immunohistochemistry and, simultaneously, normal serum levels. PSA-NCAM expression correlated with other prognostic and diagnostic markers, such as MYCN gene amplification, and serum concentrations decreased during successful treatment. CONCLUSIONS We conclude that PSA-NCAM, both immunohistochemically and in the serum, is a promising candidate for another useful diagnostic and prognostic tumor marker in childhood neuroblastoma.
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Affiliation(s)
- S Glüer
- Abteilung Kinderchirurgie, Medizinische Hochschule Hannover, Germany.
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169
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Aubert I, Ridet JL, Schachner M, Rougon G, Gage FH. Expression of L1 and PSA during sprouting and regeneration in the adult hippocampal formation. J Comp Neurol 1998; 399:1-19. [PMID: 9725697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The objective of the present study was to evaluate the expression of polysialic acid (PSA) and the cell adhesion molecule L1 during axonal regeneration and sprouting after injury to the adult rat brain. All animals received a complete lesion of the fimbria-fornix (FF). Grafts of nerve growth factor (NGF)- or beta-galactosidase (betaGal)-producing fibroblasts were placed in the FF lesion cavity and induced septohippocampal cholinergic regeneration or sympathetic tyrosine hydroxylase (TH)-positive sprouting, respectively. Cholinergic regeneration was evaluated from 2 to 8 weeks following grafting of NGF-producing fibroblasts in the FF lesion cavity. In the graft area, choline acetyltransferase (ChAT)-positive fibers expressed L1 and PSA. Once cholinergic axons reached the hippocampal formation (HF), they no longer expressed L1 or PSA. Eight weeks after a lesion of the FF and transplantation of betaGal-producing fibroblasts, TH-positive fibers sprouted in the denervated HF and expressed L1 but not PSA. At the zone of reactive gliosis, PSA but not L1 expression was increased following a lesion of the FF and transplantation of NGF- or betaGal-producing fibroblasts. In animals that received a graft of NGF-producing fibroblasts in the FF lesion cavity, numerous ChAT-positive axons were observed along these areas rich in PSA and reactive astrocytes. Taken together, these results suggest that the expression of PSA and L1 is upregulated on regenerating cholinergic axons during axonal elongation and downregulated upon target innervation. In contrast, TH-positive fibers that sprout in the denervated HF express and maintain their expression of L1. Finally, the expression of PSA in the area of reactive gliosis may contribute to a permissive environment for axonal regrowth.
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Affiliation(s)
- I Aubert
- The Salk Institute, Laboratory of Genetics, La Jolla, California 92037-1099, USA
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170
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Abstract
Sialic acids from the liver and serum of guinea-pig are composed of N-acetylneuraminic acid (Neu5Ac; 85% and 61%, respectively), N-acetyl-4-O-acetylneuraminic acid (Neu4,5Ac2; 10% and 32%, respectively) and N-glycolylneuraminic acid (Neu5Gc; 5% and 7%, respectively), besides traces of N-glycolyl-4-O-acetylneuraminic acid in serum. The analysis was carried out using thin-layer chromatography, high-performance liquid chromatography, electron impact ionization mass spectrometry, and different enzymes (sialidase, sialate esterase, and sialate-pyruvate lyase after hydrolysis and purification of the sialic acids by ion-exchange chromatography). We showed that this O-acetylation of sialic acids is due to the activity of an acetyl-coenzyme A:sialate-4-O-acetyltransferase (EC 2.3.1.44), which occurs together with sialyltransferase activity in Golgi-enriched membrane fractions of guinea-pig liver. The enzyme operates optimally at 30 degrees C in 70 mM potassium phosphate buffer at pH 6.7 and in the presence of 90 mM KCI with an apparent KM for AcCoA of 0.6 1microM and a Vmax of 20 pmol/mg protein x min. The enzyme is inhibited by coenzyme A in a mixed-competitive manner (Ki = 4.2 microM), as well as by parachloromercuribenzoate, MnCl2, saponin and Triton X-100.
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Affiliation(s)
- M Iwersen
- Biochemisches Institut, Christian-Albrechts-Universität, Kiel, Germany
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171
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Rodriguez JJ, Montaron MF, Petry KG, Aurousseau C, Marinelli M, Premier S, Rougon G, Le Moal M, Abrous DN. Complex regulation of the expression of the polysialylated form of the neuronal cell adhesion molecule by glucocorticoids in the rat hippocampus. Eur J Neurosci 1998; 10:2994-3006. [PMID: 9758169 DOI: 10.1046/j.1460-9568.1998.00316.x] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The gyrus dentatus is one of the few areas of the brain that continues to produce neurons after birth. The newborn cells differentiate into granule cells which project axons to their postsynaptic targets. This step is accompanied by the transient expression of the polysialylated isoforms of neuronal cell adhesion molecules (PSA-NCAM) by the developing neurons. Glucocorticoid hormones have been shown to inhibit neurogenesis. We noted a functional correlation between PSA-NCAM expression and glucocorticoid action after manipulation of corticosterone levels in the adrenalectomized rat. Adrenalectomy increased neurogenesis, evaluated from the incorporation of 5-bromo-2'-deoxyuridine in neuronal precursors, as well as PSA-NCAM expression. The increase in PSA-NCAM-immunoreactive (IR) cells in the gyrus dentatus, evidenced 72 h following adrenalectomy, persisted for at least a month. It was accompanied by enhanced dendritic arborization of PSA-NCAM-IR cells in the gyrus dentatus and by an increase in number of PSA-NCAM-IR fibres in the CA3 subfield. Neurogenesis was normalized by restitution of diurnal or nocturnal levels of corticosterone, whereas normalization of PSA-NCAM expression was only observed after simulation of the complete circadian fluctuation of the hormone. Our findings reveal the complex action of corticosterone in modulating the expression of PSA-NCAM in the gyrus dentatus of the hippocampal formation. They also highlight the importance of corticosterone fluctuations in the control of neurogenesis and plasticity in this structure.
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172
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Abstract
Three sialyl oligosaccharide fractions were separated from ovine colostrum by gel filtration, anion exchange chromatography and normal-phase HPLC. They were characterized by 1H-NMR spectrometry as follows: Neu5Acalpha2-->3Galbeta1-->4Glc, Neu5Gcalpha2-->6Galbeta1-->4Glc and three forms of Neu5Gcalpha2-->3Galbeta1-->4Glc, namely Neu5Gcalpha2-->3Galbeta1-->4Glc itself, its lactone derivative between the carboxyl group of Neu5Gc and Gal OH-2 and another lactone derivative between the carboxyl group and Gal OH-4. In this study, Neu5Gc-lactose lactones, in their free form, have been isolated for the first time from any natural sources including milk or colostrum.
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Affiliation(s)
- T Nakamura
- Department of Bioresource Chemistry, Obihiro University of Agriculture and Veterinary Medicine, Inada cho, Hokkaido, Obihiro, 080-8555, Japan.
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173
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Sato C, Inoue S, Matsuda T, Kitajima K. Development of a highly sensitive chemical method for detecting alpha2-->8-linked oligo/polysialic acid residues in glycoproteins blotted on the membrane. Anal Biochem 1998; 261:191-7. [PMID: 9716421 DOI: 10.1006/abio.1998.2718] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A highly sensitive chemical method for detecting alpha2-->8-linked oligo/polysialic acid (oligo/polySia) chains was developed, including (i) periodate oxidation, reduction with sodium borohydride, and subsequent acid hydrolysis, giving rise to C7 analogues and intact C9 compounds from nonreducing terminal and internal sialic acid residues, respectively; (ii) fluorescent labeling of these C7 and C9 compounds with 1,2-diamino-4,5-methylenedioxybenzene (DMB); and (iii) quantitation of theseDMB derivatives on fluorometric high-performance liquid chromatography. As little as 1 ng of internal sialic acid residues of oligo/polySia chains, the existence of which indicates the presence of oligo/polySia structure, was detectable by this method. This fluorometric C7/C9 analysis was successfully applied to glycoproteins blotted onto a slit of polyvinylidene fluoride membranes and suggested the presence of some novel oligoSia-containing glycoproteins in pig embryonic brains.
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Affiliation(s)
- C Sato
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, 464-8601, Japan
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174
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Affiliation(s)
- M J Davies
- Department of Biochemistry and Molecular Biology, University College London, UK
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175
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Cheng MC, Lin SL, Wu SH, Inoue S, Inoue Y. High-performance capillary electrophoretic characterization of different types of oligo- and polysialic acid chains. Anal Biochem 1998; 260:154-9. [PMID: 9657872 DOI: 10.1006/abio.1998.2701] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We have carried out comparative structural analysis of novel oligo- and polysialic acid chains from diverse sources. Controlled acid hydrolysates of (a) colominic acid, alpha2-->8-linked homopolymer of N-acetylneuraminic acid (Neu5Ac), (b) alpha2-->8-linked oligo/polyNeu5Gc chains present in rainbow trout egg polysialoglycoprotein, and (c) alpha2-->8-linked oligomers of deaminoneuraminic acid (KDN) residues of KDN-rich glycoprotein derived from rainbow trout vitelline envelope were analyzed by high-performance capillary electrophoresis (HPCE). The results showed that three different types of alpha2-->8-linked oligosialic acids having same degree of polymerization can be separated by HPCE. A partial hydrolysate of colominic acid with mild acid was shown by CE to form intramolecular esters during the controlled hydrolysis and the subsequent workup procedure. In contrast, lactonization of (-->5-Oglycolyl-Neu5Gcalpha2-->)n, alpha2-->5-Oglycolyl-linked homopolymer of N-glycolylneuraminic acid (Neu5Gc) present in the egg jelly coat of sea urchin, did not take place as readily as in (-->8Neu5Acalpha2-->)n.
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Affiliation(s)
- M C Cheng
- Institute of Biological Chemistry, Academia Sinica, Nankang, Taipei, 115, Taiwan
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176
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Kaverin NV, Gambaryan AS, Bovin NV, Rudneva IA, Shilov AA, Khodova OM, Varich NL, Sinitsin BV, Makarova NV, Kropotkina EA. Postreassortment changes in influenza A virus hemagglutinin restoring HA-NA functional match. Virology 1998; 244:315-21. [PMID: 9601502 DOI: 10.1006/viro.1998.9119] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
An important function of influenza virus neuraminidase (NA) is the removal of sialic acid residues from virion components in order to prevent the aggregation of virus particles. In previous communications we have reported that reassortant viruses containing the NA gene of A/USSR/90/77 (H1N1) virus and HA genes of H3, H4, H10, or H13 subtypes had a tendency to virion aggregation at 4 degrees C and that the virion clusters irreversibly dissociated after the treatment with bacterial neuraminidase. It was concluded that in such reassortants the removal of sialic acid residues is inefficient. Nonaggregating variants of the reassortants were selected in the course of serial passages in embryonated chicken eggs. In the present paper a reassortant virus, R2, having the HA gene of A/Duck/Ukraine/1/63 (H3N8) virus and the other genes of A/USSR/90/77 (H1N1) virus, as well as its non-aggregating passage variants and both parent viruses, have been studied in order to reveal the presence of unremoved sialic acid residues in the virions. An assay of sialic acid content by high-performance liquid chromatography with fluorescent detection has revealed the presence of sialic acid in the purified virus preparations of A/USSR/90/77 (H1N1) virus and the R2 reassortant and its nonaggregating variants, whereas only trace amounts of sialic acid have been detected in the A/Duck/Ukraine/1/63 (H3N8) parent virus. The data obtained with the use of the labeled "indicator" virus suggest that the unremoved sialic acid residues are present at the virion surface. The nonaggregating variants have been shown to possess a lower affinity toward high-molecular-weight sialic acid-containing substrates compared to the initial reassortant R2. Sequencing of HA genes has revealed amino acid changes in the nonaggregating variants compared to the initial reassortant. One substitution, N248D in HA1, is the same in two independently selected nonaggregating variants. The presented data suggest that the complete removal of sialic acid residues by viral NA from the virion components is not obligatory for the absence of virus particle aggregation: the latter may be achieved (in the reassortants and, presumably, in the wild-type virus) through a balance between the degree of HA affinity toward the sialic acid-containing receptors and the extent of the removal of sialic acid residues by NA.
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Affiliation(s)
- N V Kaverin
- D. I. Ivanovsky Institute of Virology, Russian Academy of Medical Sciences, Moscow, Russia.
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177
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Abstract
Microsomal fractions from pig and calf brain catalyze the enzymatic dephosphorylation of endogenous and exogenous dolichyl monophosphate (Dol-P) (Sumbilla, C. A., and Waechter, C. J. (1985) Methods Enzymol. 111, 471-482). The Dol-P phosphatase (EC 3.1.3.51) has been solubilized by extracting pig brain microsomes with the nonionic detergent Nonidet P-40 and purified approximately 1,107-fold by a combination of anion exchange chromatography, polyethylene glycol fractionation, dye-ligand chromatography, and wheat germ agglutinin affinity chromatography. Treatment of the enzyme with neuraminidase prevented binding to wheat germ agglutinin-Sepharose, indicating the presence of one or more N-acetylneuraminyl residues per molecule of enzyme. When the highly purified polyisoprenyl phosphate phosphatase was analyzed by SDS-polyacrylamide gel electrophoresis, a major 33-kDa polypeptide was observed. Enzymatic dephosphorylation of Dol-P by the purified phosphatase was 1) optimal at pH 7; 2) potently inhibited by F-, orthovanadate, and Zn2+ > Co2+ > Mn2+ but unaffected by Mg2+; 3) exhibited an approximate Km for C95-Dol-P of 45 microM; and 4) was sensitive to N-ethylmaleimide, phenylglyoxal, and diethylpyrocarbonate. The pig brain phosphatase did not dephosphorylate glucose 6-phosphate, mannose 6-phosphate, 5'-AMP, or p-nitrophenylphosphate, but it dephosphorylated dioleoyl-phosphatidic acid at initial rates similar to those determined for Dol-P. Based on the virtually identical sensitivity of Dol-P and phosphatidic acid dephosphorylation by the highly purified enzyme to N-ethylmaleimide, F-, phenylglyoxal, and diethylpyrocarbonate, both substrates appear to be hydrolyzed by a single enzyme with an apparent dual specificity. This is the first report of the purification of a neutral Dol-P phosphatase from mammalian tissues. Although the enzyme is Mg2+-independent and capable of dephosphorylating Dol-P and PA, several enzymological properties distinguish this lipid phosphomonoesterase from PAP2.
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Affiliation(s)
- D W Frank
- Department of Biochemistry, A. B. Chandler Medical Center, University of Kentucky College of Medicine, Lexington, Kentucky 40536, USA
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178
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Sharma V, Chatterjee M, Mandal C, Sen S, Basu D. Rapid diagnosis of Indian visceral leishmaniasis using achatininH, a 9-O-acetylated sialic acid binding lectin. Am J Trop Med Hyg 1998; 58:551-4. [PMID: 9598439 DOI: 10.4269/ajtmh.1998.58.551] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
We have developed a rapid, accurate, and inexpensive hemagglutination assay (HA) for diagnosis of Indian visceral leishmaniasis (VL) using achatininH, a 9-O-acetylated sialic acid binding lectin. The assay is based on the selective binding of achatininH to 9-O-acetylated derivatives of sialic acid (9-O-AcSA), which appears exclusively on the erythrocytes of patients with VL. Blood samples from 35 patients with demonstrable splenic or bone marrow amastigotes were assayed by HA and compared with an ELISA. All cases were correctly diagnosed by HA, and were in concordance with the ELISA. The increase in 9-O-AcSA was corroborated by direct fluorimetric estimation of sialic acid and its 9-O-acetylated derivative. Therefore, 9-O-acetylated derivatives of sialic acid, absent in normal erythrocytes, serve as an important biomarker, and indirectly reflect the presence of the parasite. Accordingly, this assay can be used for detection of active kala-azar cases and merits clinical consideration.
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Affiliation(s)
- V Sharma
- Indian Institute of Chemical Biology, Calcutta
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179
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Abstract
A variety of sialic acids contained in the rat epididymis were histochemically examined by means of lectin and pre-lectin methods by light microscopy. Epididymides from adult male Sprague-Dawley rats were fixed in Bouin's fluid and routinely embedded in paraffin wax. Hydrated sections were subjected either to the lectin methods using biotinylated Limax flavus, Sambucus nigra, Sambucus sieboldiana or Maackia amurensis lectins or to the selective periodate oxidation-phenylhydrazine-thiocarbohydrazide-silver protein-physical development technique with or without saponification. The present results revealed that principal cells in the initial segment and caput contain sialic acid linked to alpha2,6-galactose/N-acetylgalactosamine, whereas those in the corpus and cauda include the sialic acid alpha2,3-galactose sequence. Narrow and clear cells involve all the types of sialic acids examined. Basal and halo cells mainly contain sialic acid alpha2,3-galactose. 8- And/or 9-O-acetylated sialic acids were predominantly distributed in principal cells of the initial segment and proximal caput. These findings are taken to indicate that various sialic acids in the epididymis could participate in different physiological functions characteristic of the regions in this organ.
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Affiliation(s)
- T Ueda
- 2nd Department of Anatomy, Nagoya City University Medical School, Nagoya, Japan.
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180
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Stehling P, Gohlke M, Fitzner R, Reutter W. Rapid analysis of O-acetylated neuraminic acids by matrix assisted laser desorption/ionization time-of-flight mass spectrometry. Glycoconj J 1998; 15:339-44. [PMID: 9613820 DOI: 10.1023/a:1006965600322] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
N-Acetylneuraminic acid (a sialic acid) occurs mainly as a terminal substituent of oligosaccharides of glycoconjugates. Derivatives of neuraminic acid occur widely, substituted in the amino and hydroxy side chains, as well in the C-9 carbon skeleton. These derivatives are responsible for specific functions of sialic acids during cell-cell, cell-substrate, or cell-virus interactions. The study of O-acetylated neuraminic acids is difficult, because only small amounts are extractable from natural sources and they are generally unstable to acids and bases. We report a new method for the rapid analysis of O-acetylated neuraminic acids, using a combination of reversed phase HPLC and MALDI-TOF mass spectrometry. A mixture of neuraminic acids from bovine submaxillary gland mucins was analysed, as well as neuraminic acids variously substituted in the amino and hydroxy side chains with acetyl and glycolyl groups, respectively.
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Affiliation(s)
- P Stehling
- Institut für Molekularbiologie und Biochemie, Universitätsklinikum Benjamin Franklin, Freie Universität Berlin, Berlin-Dahlem, Germany
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181
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Sato C, Kitajima K, Inoue S, Inoue Y. Identification of oligo-N-glycolylneuraminic acid residues in mammal-derived glycoproteins by a newly developed immunochemical reagent and biochemical methods. J Biol Chem 1998; 273:2575-82. [PMID: 9446559 DOI: 10.1074/jbc.273.5.2575] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The occurrence of the alpha2-->8-linked oligomeric form of N-glycolylneuraminic acid (oligo-Neu5Gc) residues in mammalian glycoproteins was unequivocally demonstrated using a newly developed anti-oligo/poly-Neu5Gc monoclonal antibody as well as by chemical and biochemical methods. First, the antibody, designated mAb.2-4B, which specifically recognized oligo/poly-Neu5Gc with a degree of polymerization of >2, was developed by establishing a hybridoma cell line from P3U1 myeloma cells fused with splenocytes from an MRL autoimmune mouse immunized with dipalmitoylphosphatidylethanolamine-conjugated oligo/poly-Neu5Gc. Second, oligo-Neu5Gc was shown to occur in glycoproteins derived from pig spleen by Western blot analysis using mAb.2-4B, which was also confirmed by fluorometric high performance liquid chromatographic analysis of the product of periodate oxidation/reduction/acid hydrolysis of the purified glycopeptide fractions and by TLC and 600-MHz 1H NMR spectroscopic analysis of their mild acid hydrolysates. Finally, the ubiquitous occurrence of oligo-Neu5Gc chains as glycoproteinaceous components in Wistar rat tissue was immunochemically indicated. This is the first example demonstrating the diversity in oligo/poly-Sia structure in mammalian glycoproteins, where only poly-N-acetylneuraminic acid is known to occur. Such diversity in oligo/poly-Sia structure also implicates a diverged array of biological functions of this glycan unit in glycoproteins.
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Affiliation(s)
- C Sato
- Department of Biophysics and Biochemistry, Graduate School of Science, University of Tokyo, Hongo-7, Tokyo 113, Japan
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182
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Emanuél' VL. [Tracheobronchial contents and new potentialities of laboratory investigation (lecture)]. Klin Lab Diagn 1997:25-32. [PMID: 9503796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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183
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Ignacak J, Gumińska M. N-acetylneuraminic acid, phosphate and thiol groups of pyruvate kinase isoenzymes from Morris hepatoma 7777 and normal rat liver. Acta Biochim Pol 1997; 44:201-8. [PMID: 9360708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The highest amount of N-acetylneuraminic acid (AcNeu) was found in pyruvate kinase isoenzyme L from normal rat liver (24 moles/mole of enzyme tetramer), with the highest electrophoretic mobility. On the other hand, isoenzyme M2 from Morris hepatoma 7777, with the lowest electrophoretic mobility, had the lowest AcNeu content (5 moles/mole of enzyme tetramer). This tumour isoenzyme M2 of pyruvate kinase was, however, characterised by the highest phosphate content (12 moles/mole protein), in comparison to isoenzyme L (3 moles/mole protein) or normal liver isoenzyme M2 (6 moles/mole protein). This could indicate a regulatory change caused by reversible enzyme phosphorylation and dephosphorylation or sialization and desialization. Despite these differences, the sum of the two negatively charged residues was lower in tumour pyruvate kinase isoenzyme M2, with the slowest migration rate, than in normal rat liver isoenzyme M2. Moreover, isoenzyme M2 from tumour material, in comparison with isoenzyme M2 from normal rat liver, had a twice as high content of thiol groups (20 moles/mole protein), especially of free and superficially located ones, than the isoenzyme M2 from normal liver (10 moles/mole protein). This may explain abnormal susceptibility of tumour isoenzyme M2 to stereospecific inhibition by exogenous L-cysteine, and indicate genetically dependent changes in amino-acid content of tumour enzyme which take place during cell tumourigenic transformation.
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Affiliation(s)
- J Ignacak
- Department of General Biochemistry, Collegium Medicum, Jagiellonian University, Cracow, Poland
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184
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Knirel YA, Moll H, Helbig JH, Zähringer U. Chemical characterization of a new 5,7-diamino-3,5,7,9-tetradeoxynonulosonic acid released by mild acid hydrolysis of the Legionella pneumophila serogroup 1 lipopolysaccharide. Carbohydr Res 1997; 304:77-9. [PMID: 9403997 DOI: 10.1016/s0008-6215(97)00211-5] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A derivative of a new 5,7-diamino-3,5,7,9-tetradeoxynonulosonic acid was released from the lipopolysaccharide of Legionella pneumophila serogroup 1 (strain Philadelphia 1) by mild acid hydrolysis, and identified, using NMR spectroscopy and GLC-MS, as 5,7-diacetamido-8-O-acetyl-3,5,7,9-tetradeoxy-L-glycero-D-talo- nonulosonic acid or its enantiomer.
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Affiliation(s)
- Y A Knirel
- Forschungszentrum Borstel, Zentrum für Medizin und Biowissenschaften, Borstel, Germany
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185
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Karlsson NG, Herrmann A, Karlsson H, Johansson ME, Carlstedt I, Hansson GC. The glycosylation of rat intestinal Muc2 mucin varies between rat strains and the small and large intestine. A study of O-linked oligosaccharides by a mass spectrometric approach. J Biol Chem 1997; 272:27025-34. [PMID: 9341141 DOI: 10.1074/jbc.272.43.27025] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The large glycosylated domains obtained from the rat intestinal mucin Muc2 were isolated from the large and small intestine of the inbred rat strains GOT-W and GOT-BW. The expression of the rat Muc2 in the large intestine was confirmed immunochemically and by Northern blotting. Released oligosaccharides were structurally characterized by gas chromatography-mass spectrometry (neutral and sialylated species) or by tandem mass spectrometry (sulfated species), and a total of 63 structures was assigned. The large intestinal oligosaccharides were found to be identical between the strains, while the small intestinal glycosylation differed. Until now, detailed structural analysis of oligosaccharides isolated from a single mucin core or mucin domain with different origin have not been performed, and the information of different mucin glycoforms has been limited to immunochemistry. Blood group A-determinants (GalNAcalpha1-3(Fucalpha1-2)Galbeta1-, and structures related to the blood group Sda/Cad-related epitope NeuAc/NeuGcalpha1-3(GalNAcbeta1-4)Galbeta1-, were found in GOT-BW small intestine, and also in both large intestines. Blood group H-determinants and NeuAc/NeuGcalpha1-3Galbeta1- were found in all samples. Core 1 (Galbeta1-3GalNAcalpha1-), core 2 (Galbeta1-3(GlcNAcbeta1-6)GalNAcalpha1-), core 3 (GlcNAcbeta1-3GalNAcalpha1-), and core 4 (GlcNAcbeta1-3(GlcNAcbeta1-6)GalNAcalpha1- were also found in all the samples. The large intestine were enriched in sulfated oligosaccharides and the small intestine contained higher amounts of sialylated species. Sulfation were found exclusively on C-6 of GlcNAc.
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Affiliation(s)
- N G Karlsson
- Department of Medical Biochemistry, Göteborg University, Medicinaregatan 9A, 413 90 Gothenburg, Sweden.
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186
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Ikekita M, Yajima H, Murata T, Takatera K, Watanabe T, Sonoyama M, Tezuka Y, Ishii T, Tarutani O. Carbohydrate analysis of porcine thyroglobulin isoforms with different iodine contents. Biochim Biophys Acta 1997; 1336:557-65. [PMID: 9367184 DOI: 10.1016/s0304-4165(97)00070-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
To further validate the relationship between thyroid hormone formation and the carbohydrate structure of thyroglobulin (Tg), we reinvestigated the relationship between the iodine content and the asparagine-linked oligosaccharide structures of porcine Tg. Purified porcine Tg was further separated into isoforms (Tg-F1, -F2 and -F3) with a DEAE-cellulose ion-exchange chromatography column. The iodine residues, neutral sugar and sialic acid were analyzed for the separated Tg isoforms and their asparagine-linked oligosaccharide structures were analyzed. The asparagine-linked oligosaccharides were released from Tg-F1, -F2 and -F3 by hydrazinolysis and each oligosaccharide was labeled with p-aminobenzoic acid octyl ester (ABOE). The ABOE-labeled oligosaccharides from Tg-F1, -F2 and -F3 were analyzed for their relative content in oligosaccharides of each structure type by chemical methods and DEAE- and ConA high-performance liquid chromatography (HPLC) columns. As a result, it was revealed that the Tg fraction eluted at higher ionic strength from a DEAE-cellulose column is apt to contain more of each iodoamino acid, as well as total content of iodine, larger negative zeta-potential, conforming to sialic acid content in the Tg molecule and to a higher content of di-sialo-bi-antennary complex and to high mannose type oligosaccharides. These results support the conclusion that iodine organification of the Tg molecule is correlated with asparagine-linked oligosaccharide completion.
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Affiliation(s)
- M Ikekita
- Department of Applied Biology, Faculty of Science and Technology, Science University of Tokyo, Chiba, Japan.
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187
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Abstract
A comparative study was undertaken to correlate the immunohistochemical localization of polysialic acid (PSA) and the in situ localization of ST8Sia II mRNA. In situ hybridization of postnatal day 3 mouse brain showed high levels of ST8Sia II mRNA expression in the cerebral neocortex, striatum, hippocampus, subiculum, medial habenular nucleus, thalamus, pontine nuclei, and inferior colliculus; intermediate-level expression in the olfactory bulb, hypothalamus, superior colliculus, and cerebellum; and low-level expression in other regions. The distribution of ST8Sia II mRNA in the neocortex and cerebellum coincided with the immunohistochemical localization of PSA. During brain development, ST8Sia II mRNA started decreasing and had almost disappeared by postnatal day 14. Comparison between ST8Sia II and IV mRNA expression was also undertaken by northern blot analysis and competitive PCR analysis. During the late embryonic to early postnatal stages of the mouse CNS, the ST8Sia II mRNA showed abundant mRNA expression compared with the ST8Sia IV mRNA. Competitive PCR analysis of the adult mouse CNS showed weak expression of the two genes in the olfactory bulb, thalamus, hippocampus, and eyes. The regional and transient expression of ST8Sia II mRNA coincides with that of PSA, suggesting that ST8Sia II is closely involved in the biosynthesis and expression of PSA in the developing mouse CNS.
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Affiliation(s)
- N Kurosawa
- Molecular Glycobiology, Frontier Research Program, Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama, Japan
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188
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Yabkowitz R, Meyer S, Yanagihara D, Brankow D, Staley T, Elliott G, Hu S, Ratzkin B. Regulation of tie receptor expression on human endothelial cells by protein kinase C-mediated release of soluble tie. Blood 1997; 90:706-15. [PMID: 9226171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
The expression and activity of receptor tyrosine kinases (RTK) at the cell surface can be modulated by several different pathways including the proteolytic release of the extracellular domain as a soluble receptor. We investigated the regulation of tie receptor expression, an orphan RTK restricted to cells of hematopoietic and endothelial lineages, on primary human endothelial cells and a stably transfected Chinese hamster ovary (CHO) cell line. Tie was expressed in cells as a doublet of 135 and 125 kD; the 135-kD band represented mature cell surface receptor containing sialic acid and N-linked oligosaccharide residues, whereas the 125-kD band represented an intracellular pool of immature receptor. Phorbol 12-myristate 13-acetate (PMA) had dramatic effects on tie expression at the cell surface. Within 15 minutes of PMA treatment, the 135-kD band disappeared from the cell surface and was accompanied by the appearance of a 100-kD band in cell supernatants. The 100-kD band continued to accumulate in the media throughout the duration of PMA treatment during which mature tie receptor was undetectable on the cell surface by fluorescence-activated cell sorting (FACS) or in cell lysates by immunoblot analysis. Using specific antibodies, this 100-kD species was shown to be a soluble form of the tie receptor containing the extracellular domain. PMA-dependent release of soluble tie was mediated through the activation of protein kinase C (PKC); soluble tie was not released in the presence of PKC inhibitors, an inactive PMA analog, or following the downregulation of PKC through chronic PMA treatment. These results indicate that tie receptor expression on endothelial cells is regulated by the release of a soluble extracellular fragment following activation of PKC. Parallel pathways regulating c-kit, tumor necrosis factor (TNF), and colony-stimulating factor (CSF) receptor expression suggest that the release of extracellular receptor fragments represents an alternative mechanism through which cells modulate responses to growth factors and cytokines.
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Affiliation(s)
- R Yabkowitz
- Department of Mammalian Cell Molecular Biology, Amgen Inc, Thousand Oaks, CA 91320-1789, USA
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189
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Cervello M, D'Amelio L, Tesoro V, Rougon G, Matranga V. Expression of PSA-N-CAM in human neuroblastoma cells induced to neuronal differentiation by retinoic acid. Eur J Cell Biol 1997; 73:270-5. [PMID: 9243188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
The neural cell adhesion molecule (N-CAM) plays a significant role in the development of the nervous system. Three different isoforms of the molecule have been described, with molecular masses of 180, 140 and 120 kDa, whose differential expression in neurons seems to be related to their state of differentiation. We took advantage of the use of the human neuroblastoma cell line LAN-5, which can be differentiated in vitro by retinoic acid (RA) into neuronal cells, for studying the expression of N-CAM isoforms, and their polysialic acid (PSA) content, at the protein and mRNA levels. Anti-N-CAM polyclonal antibodies recognizing all the N-CAM isoforms and a monoclonal antibody recognizing PSA were used in Western blot experiments with extracts from undifferentiated and RA-differentiated cells. We found that undifferentiated cells express very little of the 180 kDa N-CAM isoform and a large amount of the 140 kDa isoform. A 4-fold increase in the expression of the 180 kDa N-CAM isoform was obtained when LAN-5 cells were differentiated by RA for 8 days, whereas a 1.8-fold increase in the expression of the 140 kDa N-CAM isoform was observed upon differentiation. Similarly, the levels of the 7.4 kb mRNA coding for N-CAM 180 kDa, determined by Northern blot analysis, were barely detectable in undifferentiated cells, and showed a 3.8-fold increase upon differentiation. By contrast, only a 1.3-fold increase in the 6.7 kb mRNA, coding for the 140 kDa N-CAM isoform, was observed. N-CAM was always found in its polysialylated form in both undifferentiated and RA-differentiated cells. This indicates that, in LAN-5 cells, the expression and activity of the polysialytransferase enzyme precedes the acquisition of a neuronal phenotype.
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Affiliation(s)
- M Cervello
- Istituto di Biologia dello Sviluppo, C.N.R., Palermo/Italy
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190
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O'Connell AW, Fox GB, Barry T, Murphy KJ, Fichera G, Foley AG, Kelly J, Regan CM. Spatial learning activates neural cell adhesion molecule polysialylation in a corticohippocampal pathway within the medial temporal lobe. J Neurochem 1997; 68:2538-46. [PMID: 9166750 DOI: 10.1046/j.1471-4159.1997.68062538.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Transient and time-dependent modulations of neural cell adhesion molecule (NCAM) polysialylation in the dentate gyrus of the rodent hippocampus are a feature of spatial and nonspatial forms of learning. In the hippocampal formation, polysialic acid immunoreactivity was localized to granule-like cells and their mossy fibre axons. We now demonstrate the latter to extend to the CA3 region where apparent recurrent and Schaffer collaterals were labelled. The axons of the CA1 pyramidal cell layer were immunopositive, as was the subiculum that they innervate. Layers I and III of the entorhinal cortex stained intensely for polysialic acid; however, these were not visible in the more lateral aspect of this region and were replaced by a single band of immunopositive neurons that extended to include the perirhinal and piriform cortices. After Morris water maze training, the number of polysialylated neurons within the entorhinal cortex exhibited a two- to threefold increase at the 10-12-h posttraining time with respect to that observed immediately after training. This increase was task specific, as no change was observed in freely swimming animals or those required to locate a visible platform. These results suggest the presence of a corticohippocampal pathway involved in the eventual consolidation of memory.
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Affiliation(s)
- A W O'Connell
- Department of Pharmacology, University College, Belfield, Dublin, Ireland
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191
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Seko A, Koketsu M, Nishizono M, Enoki Y, Ibrahim HR, Juneja LR, Kim M, Yamamoto T. Occurence of a sialylglycopeptide and free sialylglycans in hen's egg yolk. Biochim Biophys Acta 1997; 1335:23-32. [PMID: 9133639 DOI: 10.1016/s0304-4165(96)00118-3] [Citation(s) in RCA: 184] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Free sialylglycans (FSGs) and a sialylglycopeptide (SGP) as components of hen's egg yolk were found and their chemical structures were determined. SGP and FSGs were isolated from fresh egg yolk by treatment with phenol, gel filtration and successive chromatographies on columns of anion- and cation-exchangers. They were localized in the yolk plasma. The glycan moiety of SGP, which was liberated by PNGase digestion, was studied for the chemical structure by HPLC mapping with p-aminobenzoic ethylester-derivatization, sugar composition analysis, 1H nuclear magnetic resonance and matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry and the glycomoiety was found to be an N-linked disialyl-biantennary glycan. The amino acid sequence of the peptide moiety of SGP was determined to consist of Lys-Val-Ala-Asn-Lys-Thr, the Asn of which is modified with the disialylglycan moiety. FSGs were determined to be two free disialyl-biantennary glycans whose reducing end was either Man beta1-4GlcNAc (FSG-I) or Man beta1-4GlcNAc beta1-4GlcNAc (FSG-II). Since the molar value of SGP present in one egg yolk (2.8 micromol) is comparable to those of well-known major yolk proteins, low density lipoprotein, lipovitellins and phosvitin, it can be considered that SGP is one of the major components in hen's egg yolk.
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Affiliation(s)
- A Seko
- Central Research Laboratories, Taiyo Kagaku Co., Ltd., Mie, Japan
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192
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Klein A, Diaz S, Ferreira I, Lamblin G, Roussel P, Manzi AE. New sialic acids from biological sources identified by a comprehensive and sensitive approach: liquid chromatography-electrospray ionization-mass spectrometry (LC-ESI-MS) of SIA quinoxalinones. Glycobiology 1997; 7:421-32. [PMID: 9147052 DOI: 10.1093/glycob/7.3.421] [Citation(s) in RCA: 99] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Sialic acids are a family of 9-carbon carboxylated sugars, where different substitutions of the backbone define over 30 members. Biological roles of these substitutions have been missed until recently because of their low abundance and lability to conventional isolation/purification methods. This new approach characterizes sialic acids using electrospray ionization-mass spectrometry (ESI-MS) to monitor the HPLC separation of their DMB (1,2-diamino-4,5-methylenedioxy-benzene) derivatives (quinoxalinones). A combination of retention times and spectra characteristics allows definition of the type and position of the various substituents. This approach requires no previous purification, involving a simple derivatization reaction followed by direct injection on the microbore HPLC column. A complete spectrum, including molecular ions and CAD fragments of a sialic acid quinoxalinone, is obtained by injecting 10-20 pmol of the compound. Individual quinoxalinones can be purified by regular RP-HPLC and analyzed by direct-injection ESI-MS or LSIMS. Using this approach, we identified 28 different sialic acids, including the following new species: Neu5Gc9Lt (BSM), anhydro derivatives of Neu5Ac other than the 4,8-anhydro (horse serum hydrolyzates), KDN5(7)Ac and KDN5(7),9Ac2 (amphibian Pleurodeles waltl), four isomers of Neu5Gc8MexAc and three anhydro derivatives of Neu5Gc8Me (glycolipids of the starfish Pisaster brevispinus), and Neu5Ac8S (in addition to Neu5Gc8S, in the glycolipids of the sea urchin Lovenia cordiformis). Results show the usefulness of LC-ESI-MS to study sialic acid diversity, and identification of small amounts of unexpected sialic acids or new members of their family.
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Affiliation(s)
- A Klein
- INSERM Unité 377, Lille, France
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193
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Abstract
The monosaccharide composition analysis described in this paper employs capillary electrophoretic separation of sugar monomers liberated from glycoproteins or oligosaccharides, by high temperature acidic hydrolysis. Trifluoroacetic acid was used for sialo- and neutral-sugar hydrolysis, and hydrochloric acid was used for amino-sugar hydrolysis. The neutral- and amino-sugars in the hydrolyzates were then labeled with a charged fluorophore, 8-aminopyrene-1,3,6-trisulfonate, while sialic acids were labeled with 9-aminoacridone. The stoichiometry of labeling was such that only one fluorophore molecule was attached to each monosaccharide molecule. The labeled monosaccharides were then separated by high-performance capillary electrophoresis with laser induced fluorescence detection. The acidic hydrolysis and fluorophore labeling conditions described in this paper are suitable for monosaccharide composition analysis of a wide variety of complex carbohydrates from glycoprotein and/or oligosaccharide samples using capillary electrophoresis.
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Affiliation(s)
- A Guttman
- Beckman Instruments Inc., Fullerton CA 92634, USA
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194
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Abstract
Septation of the tubular heart to form the multi-chambered heart involves endocardial cell mesenchymal transformation at discrete sites. These sites include the crests of endocardial cushions at the atrioventricular junction, crests of the spiral ridges within the outflow tract, and the leading edge of the atrial septum. The factors involved in this multi-step inductive process appear to include the neural cell adhesion molecule (NCAM). The down-regulation of NCAM coincident with mesenchymal transformation has been documented at the atrioventricular cushion tissue. In view of the function-regulation properties of polysialylated NCAM (PSA-NCAM), we hypothesized that this form of NCAM would be playing a role during the dramatic changes in cell-cell interactions occurring in the endocardium at the leading edge of the primary atrial septum. Chicken hearts at stages during primary atrial septum development were fixed with paraformaldehyde and either immunofluorescently stained for the light microscope analysis or immunoperoxidase stained for ultrastructural analysis. A monoclonal antibody to an NCAM polypeptide epitope (5E) was used to detect all forms of NCAM, while a monoclonal to the polysialic acid (5A5) was used to detect that subset of NCAM which is highly polysialylated (PSA-NCAM). By light microscope level analysis, an increase in immunostaining for NCAM and the appearance of PSA-NCAM was detected on embryonic chicken endocardial cells at the leading edge of the growing atrial septum. The ultrastructural analysis revealed that there is also a change in the pattern of NCAM and PSA-NCAM from a polarized localization to a more ubiquitous distribution over the endocardial cell surface as these cells send out processes, form multiple layers, and sink or move into the underlying extracellular matrix. PSA-NCAM was also detected along cell appositions of cells within the matrix. Both NCAM and PSA-NCAM levels were reduced on cells deep within the matrix. These findings indicate that during primary atrial septation, PSA-NCAM may be deployed on endocardial epithelial cells in order to down-regulate cell-cell interactions and allow the detachment and migration of some of these cells into the underlying matrix.
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Affiliation(s)
- M Gerety
- Department of Pediatrics, Rainbow Babies and Childrens Hospital, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106, USA
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195
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Abstract
In the central nervous system cell migration is usually restricted to developmental periods and occurs mainly radially, following the radial glia. Nevertheless, in the subependymal layer of the adult rodent forebrain tangential migration of newly generated neuronal precursors directed to the olfactory bulb, which follow a well-defined pathway without dispersion, has been recently demonstrated. In the present study, by using light microscopic immunocytochemistry for glia-associated antigens (glial fibrillary acidic protein, S-100 and vimentin), and conventional electron microscopy, we observed a dense mesh-work of astrocytic cells and processes throughout the subependymal layer of the adult rat. These cells were organized to form tangentially oriented glial tubes in the subependymal layer of the lateral ventricle and in its rostral extension to the olfactory bulb. Glial tubes were particularly evident within the rostral extension and were widely intercommunicating. Using markers for the proliferating/ migrating cells of the rostral migratory stream (5-bromo-2'-deoxyuridine, PSA-NCAM, class III beta-tubulin), we provide evidence that long chains of PSA-NCAM/beta-tubulin-positive, newly generated cells are consistently observed inside the glial tubes. These results demonstrate the existence of a peculiar glial organization within the subependymal layer of the adult rat, consisting of long astrocytic tubes that likely represent a new type of glial guidance, accounting for the tangential migration of a high number of cells along their restricted pathway, to the olfactory bulb.
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196
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Morimoto K, Tsuda E, Said AA, Uchida E, Hatakeyama S, Ueda M, Hayakawa T. Biological and physicochemical characterization of recombinant human erythropoietins fractionated by Mono Q column chromatography and their modification with sialyltransferase. Glycoconj J 1996; 13:1013-20. [PMID: 8981093 DOI: 10.1007/bf01053197] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Ten erythropoietin (EPO) fractions differing in sialic acid content, ranging from 9.5 to 13.8 mol mol-1 of EPO, were obtained from baby hamster kidney cell-derived recombinant human EPO by Mono Q column chromatography. The mean pI values of the EPO fractions determined by IEF-gel electrophoresis systematically shifted from 4.11 to 3.31, coinciding with the sialic acid content, without a change in the constitution of asialo N-linked oligosaccharides of each fraction. Although a linear relationship between the in vivo bioactivity and the sialic acid content of the fractionated samples was observed until 12.1 mol mol-1 of EPO, there was no further increase in their activity over 12.4 mol mol-1 of EPO. On the other hand, an inverse relationship between the in vitro bioactivity and sialic acid content of EPO was observed. Also, we showed that the in vivo bioactivity of some fractions with low sialic acid contents was increased after treatment with alpha 2,6-sialyltransferase, but the in vivo bioactivity of the other fractions with high sialic acid contents was either decreased or not affected.
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Affiliation(s)
- K Morimoto
- Division of Biological Chemistry and Biologicals, National Institute of Health Sciences, Tokyo, Japan
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197
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Hirshberg A, Bodner L, Naor H, Skutelsky E, Dayan D. Lectin histochemistry of the submandibular and sublingual salivary glands in rats. Histol Histopathol 1996; 11:999-1005. [PMID: 8930643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Tissue sections from rat submandibular and sublingual glands were studied with lectin probes to identify terminal sugars of the glycoconjugates in various cell types of the salivary glands. The lectins used in the study were Canavalia ensiformis (Con A), Triticum vulgaris (WGA), Succinyl WGA (S-WGA) Ricinus communis I (RCA-I), Arachis hypogaea (PNA), and Ulex europeaus (UEA-I). The cytoplasm and cell membrane of both the serous and mucous acinar cells present high similarity in the distribution of some sugar residues, but differ considerably in the expression of specific sugars which appear either in the serous or in the mucous cells. The cytoplasm and cell membrane of the serous and mucous acinar cells express Mannose (Man) and Glucose (Glc), but lack Galactose (Gal), and N-acetylgalactosamine (GalNAc). Fucose (Fuc) is present only in the mucous acinar cytoplasm. The moderate to intense binding of WGA to the acinar and ductal cells and the lack of binding of S-WGA, indicate the presence of sialic acid rather than N-acetylglucosamine (GlcNAc). These sialic acid residues are not associated with PNA-binding sugar sequences as pretreatment with neuraminidase is not associated with exposure of additional PNA receptors.
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Affiliation(s)
- A Hirshberg
- Section of Oral Pathology and Oral Medicine, Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Israel
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198
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Taniguchi S, Yamanari H, Inada K, Iwamura T, Hokkoku S, Tanaka S, Fukuda M, Setoguchi T. Adenocarcinoma in the anal canal associated with a fistula: report of a case. Surg Today 1996; 26:707-10. [PMID: 8883243 DOI: 10.1007/bf00312089] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Adenocarcinoma in the anal canal associated with an anal fistula is extremely rare, and in most cases its origin is difficult to ascertain because the primary sites have already been destroyed before any diagnosis of malignancy is able to be made. We report herein the case of a 62-year-old man found to have papillary adenocarcinoma with partial mucinous carcinoma associated with an anal fistula. The tumor was not exposed to the mucosal surface of the anal canal or rectum and an abdominoperineal resection was carried out. Macroscopic findings suggested that the tumor had developed from the anal fistula; however, the tumor showed a positive results when tested for O-acetylated sialic acids. This test also proved positive in the mucus of normal rectal mucosa, but not in the mucus of the anal glands. We speculated that the results of these tests may indicate that this tumor could have originated from the rectal mucosa, from where it migrated into the anal fistula.
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Affiliation(s)
- S Taniguchi
- First Department of Surgery, Miyazaki Medical College, Japan
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199
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Abstract
Polysialic acid (PSA), generally lost from the vertebrate nervous system during maturation, may regulate developmental differences in axon growth, bundling, and sprouting. Changes in polysialic levels on the axon surface seem to be involved during development in establishing normal pattern of muscle innervation. Besides the well-established role of PSA as a regulator of cell-cell interactions during development, PSA expression in myelinated axons may be related to reparative events in response to chemically induced injuries. Histochemical staining method using lectins with well-characterized binding specificities shows that glycoconjugates of the node of Ranvier undergo a rearrangement during exposure to 2,5-hexanedione, known to induce a peripheral neuropathy characterized by giant axonal swelling and retrograde demyelination. In particular, neutral glycoproteins with terminal galactose are replaced by sialoglycoproteins, consistent with the proposed role of PSA as a regulator of axonal behaviour during regeneration.
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Affiliation(s)
- M R Carratù
- Institute of Pharmacology, Medical School, University of Bari, Italy
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200
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van der Reijden WA, van der Kwaak JS, Veerman EC, Nieuw Amerongen AV. Analysis of the concentration and output of whole salivary constituents in patients with Sjögren's syndrome. Eur J Oral Sci 1996; 104:335-40. [PMID: 8930579 DOI: 10.1111/j.1600-0722.1996.tb00088.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
In Sjögren's syndrome, salivary glands are affected, resulting in a diminished salivary flow. In the present study, the protein composition, sialic acid content and the amounts of calcium and phosphate of stimulated whole saliva from 43 patients with Sjögren's syndrome, were compared with those of control saliva samples from 17 healthy subjects. The absolute concentrations of albumin, cystatin C, cystatin S, total IgA and total protein, but not amylase, were increased significantly in both primary and secondary Sjögren's syndrome. The output/min of total protein, albumin, amylase, and IgA was, however, decreased in Sjögren patients. These results suggest that the diminished output of salivary defence factors, rather than their absolute concentrations, may be related to the oral health problems seen in Sjögren's syndrome patients.
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Affiliation(s)
- W A van der Reijden
- Department of Oral Biochemistry, Academic Centre for Dentistry Amsterdam (ACTA), The Netherlands.
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