[The characteristics of the phospholipid composition of the pulp in the milk teeth]. / Osobennosti fosfolipidnogo sostava pul'py molochnykh zubov.

Qualitative and quantitative phospholipid composition of porcine deciduous teeth pulp was studied by microthin-layer chromatography. Basing on the differences in the levels of individual phospholipids in the pulp of deciduous and permanent teeth, the authors come to a conclusion on the inadequate structural organization and functional activity of the pulp of deciduous teeth.

[The characteristics of lectin binding to the surface of differentiated neuroblastoma C 1300 cells]. / Osobennosti sviazyvaniia nekotorykh lektinov s poverkhnost'iu differentsirovannykh kletok neiroblastomy C 1300.

Peculiarities of the binding of lectins of castor bean, cochlea, soya bean, lime bean and wheat germs to the surface of differential neuroblastoma C 1300 N 18 cells have been studied using the method electron cytochemistry. It is found that the quantity of the bound lectin conjugates with colloidal gold on the surface of differentiated cells varied considerably from that on the surface of nondifferentiated cells.

[Identification and properties of insulin receptors in neuroblastoma C 1300 N 18 cells in various functional states]. / Identifikatsiia i svoistva insulinovykh retseptorov v kletkakh neiroblastomy C 1300 N 18 pri razlichnykh funktsional'nykh sostoianiiakh.

The presence of insulin receptors in neuroblastoma C 1300 N18 cells was shown by the method of the [125I]insulin binding with cells as well as by the electron-cytochemical methods based on the analysis of the binding of colloid gold-labelled insulin and of agglutinin of wheat embryos with the surface of plasma membrane. It is established that the number and distribution of insulin receptors depend on the functional state of cells. Expression of receptors on the membrane increases after 5'-deoxyuridine-induced differentiation of cells. Due to changes in the lipid composition of cells caused by the incubation with lecithin-cholesterol liposomes (an increase in the content of cholesterol and its esters, as well as of unsaturated fatty acids and appearance of lysolecithin) the quantity of insulin receptors decreases and cell membranes are damaged. The lowering insulin regulation is not observed for insulin receptors of the neuroblastoma C 1300 N18 cells.

[Localization of lectin receptors on the surface of C1300 neuroblastoma cells]. / O lokalizatsii retseptorov lektinov na poverkhnosti kletok neiroblastomy C 1300.

D-mannose, D-galactose, N-acetyl-D-galactosamine, N-acetyl-D-glucosamine and L-fucose which are sugar determinants of receptors were found on the surface of neuroblastoma cells by means of four carbohydrate-specific lectin groups. Labeling of lectins was performed by horseradish peroxidase, ferritin and colloidal gold. Peculiarities of the lectin receptors distribution on the surface of immature neuroblastoma cells were detected.

[Cell surface receptors in lymphoid lines studied using lectins]. / Issledovanie retseptorov na poverkhnosti kletok limfoidnykh linii s pomoshch'iu lektinov.

The nature and distribution of some carbohydrate receptors on the cell membrane of transformed human B- and T-derived lymphocyte cell lines (RPMI-1788, Daudi, Jurkat, Molt-4) are studied by Ricinus communis agglutinin, soybean agglutinin, Helix pomatia lectin, peanut agglutinin and wheat germ agglutinin conjugated with ferritin and colloidal gold. The quality of receptors and the manner of their distribution detected by different lectins are considerably different.

[Effect of beta-sitosterol incorporated into liposomes on several indicators of lipid metabolism in experimental hypercholesteremia in rats]. / Vliianie beta-sitosterina zakliuchennogo v liposomy, na nekotornye pokazateli lipidnogo obmena pri éksperimental'noi giperkholesterinemii u krys.

Alterations in lipid content of microvilli membranes, affecting their physical structure, as well as in lipoproteins of rat small intestinal mucosa and of blood plasma were studied in experimental hypercholesterolemia after treatment with crystalline and liposomal preparations of beta-sitosterol. The liposomal preparation of beta-sitosterol exhibited distinctly higher hypocholesterolemic activity as compared with the crystalline sterol. Possible role of structural and functional alterations in enterocyte membranes and in intestinal lipoproteins during absorption of cholesterol as well as inhibition of the processes by means of beta-sitosterol are discussed.