Пазынина Галина Валентиновна

Кандидат химических наук


Старший научный сотрудник (Лаборатория углеводов)

Тел.: +7 (495) 330-61-29

Эл. почта: pazynina@carb.ibch.ru

Избранные публикации

  1. Alekseeva A., Kapkaeva M., Shcheglovitova O., Boldyrev I., Pazynina G., Bovin N., Vodovozova E. (2015). Interactions of antitumour Sialyl Lewis X liposomes with vascular endothelial cells. Biochim. Biophys. Acta 1848 (5), 1099–1110 [+]

    Recently, we showed that tetrasaccharide selectin ligand SiaLe(X) provided targeted delivery of liposomes loaded in the bilayer with melphalan lipophilic prodrug to tumour endothelium followed by severe injury of tumour vessels in a Lewis lung carcinoma model. Here, we study the impact of SiaLe(X) ligand on the interactions of liposomes with human umbilical vein endothelial cells (HUVEC) using flow cytometry, spectrofluorimetry and confocal microscopy. Liposomes composed of egg phosphatidylcholine/yeast phosphatidylinositol/1,2-dioleoyl glycerol ester of melphalan, 8:1:1, by mol, and varying percentages of lipophilic SiaLe(X) conjugate were labelled with BODIPY-phosphatidylcholine. The increase in SiaLe(X) content in liposomes led to a proportional increase in their uptake by cytokine-activated cells as opposed to non-activated HUVEC: for 10% SiaLe(X) liposomes, binding avidity and overall accumulation increased 14- and 6-fold, respectively. The early stages of intracellular traffic of targeted liposomes in the activated cells were monitored by co-localisation with the trackers of organelles. Endocytosis of SiaLe(X) liposomes occurred mostly via clathrin-independent pathways, which does not contradict the available literature data on E-selectin localisation in the plasma membrane. Using dual fluorescence labelling, with rhodamine-labelled phospholipid and calcein encapsulated at self-quenching concentrations, we found that SiaLe(X) liposomes undergo rapid (within minutes) internalisation by activated HUVEC accompanied by the disruption of liposomes; non-activated cells consumed a negligible dose of liposomes during at least 1.5h. Our data evidence the selective effect of SiaLe(X) formulations on activated endothelial cells and indicate their potential for intracellular delivery of melphalan lipophilic prodrug.

    ID:1242
  2. Vodovozova E.L., Pazynina G.V., Bovin N.V. (2011). Synthesis of diglyceride conjugate of selectin ligand SiaLeX as a vector for targeting of drug-loaded liposomes. Mendeleev Communications 21 (2), 69–71 [+]

    A conjugate of tetrasaccharide Sialyl Lewis X [SiaLeX, Neu5Acα2-3Galβ1-4(Fucα1-3)GlcNAcβ] 3-aminopropyl glycoside and rac-1,2-dioleoyl-3-carboxymethylene[poly(8–15)oxyethylene]oxyacetylamidopropionylglycerol amenable for the incorporation in lipid bilayer of drug-loaded liposomes to achieve targeting in tumors and inflammation foci was obtained by the formation of carboxamide bond.

    ID:670
  3. Pazynina G., Sablina M., Mayzel M., Nasonov V., Tuzikov A., Bovin N. (2009). Chemical synthesis of 6(GlcNAc)- and 6(Gal)-O-sulfated SiaLe(X) tetrasaccharides in spacer-armed form. Glycobiology 19 (10), 1078–81 [+]

    Practical synthesis of tetrasaccharide sulfates, 6((GlcNAc))-O-Su-SiaLe(X)-OCH(2)CH(2)CH(2)NH(2) and 6((Gal))-O-Su-SiaLe(X)-OCH(2)CH(2)CH(2)NH(2) (Su( )SO(3)H), selectin ligands, and leu- kocyte trafficking agents is presented. Both sulfates were synthesized starting from the same precursor, protected SiaLe(x), by the conventional procedures of carbohydrate chemistry. The sulfated SiaLe(x) derivative was modified at the spacer group to give 6((Gal))-O-Su-SiaLe(x)- OCH(2)CH(2)CH(2)NH-COCH(2)CH(2)C[triple bond]CH, convenient for "click chemistry" mode conjugation with an azido carrier, particularly, for the synthesis of an immunogen.

    ID:236
  4. Vodovozova E.L., Pazynina G.V., Tuzikov A.B., Grechishnikova I.V., Molotkovsky J.G. (2009). Synthesis of photoreactive inorganic probes--instruments for studying membrane lectins. Bioorg. Khim. 30 (2), 174–81 [+]

    A method for the synthesis of photoaffinity neoglycolipid probes with a highly efficient carbene-generating diazocyclopentadien-2-ylcarbonyl (Dcp) label, which can be radioiodinated under standard oxidation conditions, was developed. The probes are intended for incorporation into the lipid bilayer. They are lipophilic glycoconjugates on the basis of an amphiphilic aglycone built up from a diacylglycerol and a polyethylene glycol spacer (with a polymerization degree of 9-16) bearing the Dcp label at the terminal unit. The location of the label in the aglycone provides the possibility of one-step preparation of a wide range of probes using various carbohydrate synthons. We have synthesized photoaffinity neoglycoconjugates containing the oligosaccharides: sialyl LewisX tetrasaccharide and A trisaccharide, which is specific to some tumor cells. A probe containing an inactive pentaol (aminodeoxyglucitol) was also synthesized to detect nonspecific binding. The Dcp label is bound to the probe molecule by ester bond; its lability under alkaline conditions facilitates the analysis of cross-linked products after photoaffinity labeling. The English version of the paper: Russian Journal of Bioorganic Chemistry, 2004, vol. 30, no. 2; see also http://www.maik.ru.

    ID:242
  5. Rapoport E.M., André S., Kurmyshkina O.V., Pochechueva T.V., Severov V.V., Pazynina G.V., Gabius H.J., Bovin N.V. (2008). Galectin-loaded cells as a platform for the profiling of lectin specificity by fluorescent neoglycoconjugates: a case study on galectins-1 and -3 and the impact of assay setting. Glycobiology 18 (4), 315–24 [+]

    The involvement of galectins as pleiotropic regulators of cell adhesion and growth in disease progression explains the interest to define their ligand-binding properties. Toward this end, it is desirable to approach in vivo conditions to attain medical relevance. In order to simulate physiological conditions with cell surface glycans as recognition sites and galectins as mediators of intercellular contacts we developed an assay using galectin-loaded Raji cells. The extent of surface binding of fluorescent neoglycoconjugates depended on the lectin presence and the type of lectin, the nature of the probes' carbohydrate headgroup and the density of unsubstituted beta-galactosides on the cell surface. Using the most frequently studied galectins-1 and -3, application of this assay led to rather equal binding levels for linear and branched oligomers of N-acetyllactosamine. A clear preference of galectin-3 for alpha1-3-linked galactosylated lactosamine was noted. In parallel, a panel of 24 neoglycoconjugates was tested as inhibitors of galectin binding from solution to N-glycans of surface-immobilized asialofetuin. These two assays differ in presentation of the galectin and ligand, facilitating identification of assay-dependent properties. Under the condition of the cell assay, selectivity among oligosaccharides for the lectins was higher, and extraordinary affinity of galectin-1 to 3'-O-sulfated probes in a solid-phase assay was lost in the cell assay. Having introduced and validated a cell assay, the comprehensive profiling of ligand binding to cell-surface-presented galectins is made possible.

    ID:237
  6. Gambaryan A.S., Boravleva E.Y., Matrosovich T.Y., Matrosovich M.N., Klenk H.D., Moiseeva E.V., Tuzikov A.B., Chinarev A.A., Pazynina G.V., Bovin N.V. (2005). Polymer-bound 6' sialyl-N-acetyllactosamine protects mice infected by influenza virus. Antiviral Res. 68 (3), 116–23 [+]

    To develop a mouse model for testing receptor attachment inhibitors of human influenza viruses, the human clinical virus isolate in MDCK cells A/NIB/23/89M (H1N1) was adapted to mice by serial passaging through mouse lungs. The adaptation enhanced the viral pathogenicity for mice, but preserved the virus receptor binding phenotype, preferential binding to 2-6-linked sialic acid receptors and low affinity for 2-3-linked receptors. Sequencing of the HA gene of the mouse-adapted virus A/NIB/23/89-MA revealed a loss of the glycosylation sites in positions 94 and 163 of HA1 and substitutions 275Asp-->Gly in HA1 and 145Asn-->Asp in HA2. The four mouse strains tested differed significantly in their sensitivity to A/NIB/23/89-MA with the sensitivity increasing in the order of BALB/cJCitMoise, C57BL/6LacSto, CBA/CaLacSto and A/SnJCitMoise strains. Testing of protective efficacy of the polyacrylamide conjugate bearing Neu5Acalpha2-6Galbeta1-4GlcNAc trisaccharide under conditions of lethal or sublethal virus infection demonstrated a strong protective effect of this preparation. In particular, aerosol treatment of mice with the polymeric attachment inhibitor on 24-110 h after infection completely prevented mortality in sensitive animals and lessened disease symptoms in more resistant mouse strains.

    ID:238
  7. Gambaryan A.S., Tuzikov A.B., Pazynina G.V., Webster R.G., Matrosovich M.N., Bovin N.V. (2004). H5N1 chicken influenza viruses display a high binding affinity for Neu5Acalpha2-3Galbeta1-4(6-HSO3)GlcNAc-containing receptors. Virology 326 (2), 310–6 [+]

    To characterize differences in the receptor-binding specificity of H5N1 chicken viruses and viruses of aquatic birds, we used a panel of synthetic polyacrylamide (PAA)-based sialylglycopolymers that carried identical terminal Neu5Acalpha2-3Gal fragments but varied by the structure of the next saccharide residues. A majority of duck viruses irrespective of their HA subtype, bound with the highest affinity to trisaccharide Neu5Acalpha2-3Galbeta1-3GlcNAc, suggesting that these viruses preferentially recognize sialyloligosaccharide receptors with type 1 core (Galbeta1-3GlcNAc). Substitution of 6-hydroxyl group of GlcNAc residue of tested sialylglycopolymers by 6-sulfo group had little effect on receptor binding by duck viruses. By contrast, H5N1 chicken and human viruses isolated in 1997 in Hong Kong preferred receptors with type 2 core (Galbeta1-4GlcNAcbeta) and bound sulfated trisaccharide Neu5Acalpha2-3Galbeta1-4(6-HSO3)GlcNAcbeta (6-Su-3'SLN) with the extraordinary high affinity. Another chicken virus, A/FPV/Rostok/34 (H7N1), and several mammalian viruses also displayed an increased affinity for sulfated sialyloligosaccharide receptor. The binding of chicken and mammalian viruses to tracheal epithelial cells of green monkey decreased after treatment of cells with glucosamine-6-sulfatase suggesting the presence of 6-O-Su-3'SLN determinants in the airway epithelium. It remains to be seen whether existence of the 6-O-Su-3'SLN groups in the human airway epithelial cells might facilitate infection of humans with H5N1 chicken viruses.

    ID:37