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Natural heparin complexes proved to activate the anticoagulation system. The obtained experimental data convincingly confirm that glutamic acid alone, and particularly in a complex with heparin, has a considerable preventive potential and efficiently protects experimental animals with induced diabetes mellitus. 相似文献
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N. F. Myasoedov L. A. Andreeva L. A. Lyapina T. A. Shubina M. E. Grigor’eva T. Yu. Obergan 《Biology Bulletin》2013,40(3):304-306
It has been established that fivefold intranasal administration of the peptide Leu-Pro-Gly-Pro (1 mg/kg) to rats with developing refractory hyperglycemia leads to restoration and normalization of the functions of anticoagulation and insular systems. In the blood of experimental animals, there was a decrease in the sugar level and platelet aggregation and an increase in anticoagulant and all kinds of fibrinolytic (total, enzymatic, non-enzymatic, Hageman-dependent) activity. 相似文献
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Anna Filippova Irina Lyapina Ilya Kirov Victor Zgoda Alexey Belogurov Anna Kudriaeva Vadim Ivanov Igor Fesenko 《Journal of peptide science》2019,25(2)
Plant secretome comprises dozens of secreted proteins. However, little is known about the composition of the whole secreted peptide pools and the proteases responsible for the generation of the peptide pools. The majority of studies focus on target detection and characterization of specific plant peptide hormones. In this study, we performed a comprehensive analysis of the whole extracellular peptidome, using moss Physcomitrella patens as a model. Hundreds of modified and unmodified endogenous peptides that originated from functional and nonfunctional protein precursors were identified. The plant proteases responsible for shaping the pool of endogenous peptides were predicted. Salicylic acid (SA) influenced peptide production in the secretome. The proteasome activity was altered upon SA treatment, thereby influencing the composition of the peptide pools. These results shed more light on the role of proteases and posttranslational modification in the “active management” of the extracellular peptide pool in response to stress conditions. It also identifies a list of potential peptide hormones in the moss secretome for further analysis. 相似文献
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L. A. Lyapina N. F. Myasoedov L. A. Andreeva A. M. Ul’yanov T. Yu. Obergan T. A. Shubina V. E. Pastorova 《Biology Bulletin》2010,37(3):316-320
Repeated (over 7 days) intranasal introduction of the Pro-Gly-Pro-Leu peptide into animals at a dose of 1 mg/kg before injection
of the diabetogenic metabolite alloxan provided effective protection of an organism against development of insulin-dependent
diabetes mellitus and prevented development of hyper-coagulating alterations in the system of hemostasis. An increasing in
the anticoagulating and fibrinolytic activities in rat blood plasma was detected. The peptide under study also showed antidiabetogenic
action: repeated intranasal introduction of the Pro-Gly-Pro-Leu peptide into animals for 7 days inhibited development of diabetes
symptoms in rats pretreated with alloxan. 相似文献
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TÜNDE TÓTH OTTÓ ZSIROS MIHÁLY KIS GYŐZŐ GARAB LÁSZLÓ KOVÁCS 《Plant, cell & environment》2012,35(12):2075-2086
Despite intense research, the mechanism of Cd2+ toxicity on photosynthesis is still elusive because of the multiplicity of the inhibitory effects and different barriers in plants. The quick Cd2+ uptake in Synechocystis PCC 6803 permits the direct interaction of cadmium with the photosynthetic machinery and allows the distinction between primary and secondary effects. We show that the CO2‐dependent electron transport is rapidly inhibited upon exposing the cells to 40 µm Cd2+ (50% inhibition in ~15 min). However, during this time we observe only symptoms of photosystem I acceptor side limitation and a build of an excitation pressure on the reaction centres, as indicated by light‐induced P700 redox transients, O2 polarography and changes in chlorophyll a fluorescence parameters. Inhibitory effects on photosystem II electron transport and the degradation of the reaction centre protein D1 can only be observed after several hours, and only in the light, as revealed by chlorophyll a fluorescence transients, thermoluminescence and immunoblotting. Despite the marked differences in the manifestations of these short‐ and long‐term effects, they exhibit virtually the same Cd2+ concentration dependence. These data strongly suggest a cascade mechanism of the toxic effect, with a primary effect in the dark reactions. 相似文献
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PETER BOGNER DENYS N. WHEATLEY CSABA BORBLY ATTILA MISETA 《Cell biology international》1996,20(11):741-749
Exchange of erythrocyte intracellular (i/c) K+for extracellular (e/c) Na+in human erythrocytes treated with sub-CMC concentrations of the non-ionic detergent Brij 58 can be stopped by reincubation in serum or albumin containing solutions. The progressive equilibration of the K+contents of detergent-treated human erythrocytes with the incubation medium was reversed by an albumin-mediated withdrawal of detergent molecules from the cell. Re-establishment of near normal [K+] in terms of K+/kg water proceeds in two ways: (i) a metabolism-dependent net accumulation of K+ions; and (ii) a metabolism-independent shrinkage of erythrocytes, this being the more significant factor. 相似文献
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L. A. Lyapina T. Yu. Obergan M. E. Grigorieva E. S. Maistrenko 《Moscow University Biological Sciences Bulletin》2013,68(3):91-94
In the present work, the formation of the proline-heparin complex has been established. The way to synthesize the complex in vitro has been developed. The complex synthesized with the molar ratio of proline to heparin of 3: 1 extended the time of formation of a fibrin clot, reduced platelet aggregation, and showed a lytic effect towards nonstabilized fibrin in vitro conditions. Ten minutes after intravenous administration of the proline-heparin complex, there was an increase in levels of fibrin-depolymerization, anticoagulant, antifibrin-stabilizing and antiplatelet activity in blood of animals, whereas its components, proline and heparin, did not have such effects. 相似文献
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Experimental data on the effect of the natural immunopeptide tuftsin and its synthetic counterpart on hemostasis parameters in vitro and in vivo when administered intranasally to animals (white laboratory rats) are given. It has been shown that in vitro both preparations induced a fibrin-depolymerization effect on fibrin that is not stabilized by factor XIIIa. For each preparation, it was noted that, when administered to rats, simultaneous antiplatelet, anticoagulant, and fibrin-depolymerization effects were observed in the blood plasma, with Selank having a more pronounced effect. 相似文献