Amylase-Sensitive Polymeric Nanoparticles Based on Dextran Sulfate and Doxorubicin with Anticoagulant Activity

This study looked into the synthesis and study of Dextrane Sulfate–Doxorubicin Nanoparticles (DS–Dox NP) that are sensitive to amylase and show anticoagulant properties. The particles were obtained by the method of solvent replacement. They had a size of 305 ± 58 nm, with a mass ratio of DS:Dox = 3.3:1. On heating to 37 °C, the release of Dox from the particles was equal to 24.2% of the drug contained. In the presence of amylase, this ratio had increased to 42.1%. The study of the biological activity of the particles included an assessment of the cytotoxicity and the effect on hemostasis and antitumor activity. In a study of cytotoxicity on the L929 cell culture, it was found that the synthesized particles had less toxicity, compared to free doxorubicin. However, in the presence of amylase, their cytotoxicity was higher than the traditional forms of the drug. In a study of the effect of DS–Dox NP on hemostasis, it was found that the particles had a heparin-like anticoagulant effect. Antitumor activity was studied on the model of ascitic Zaidel hepatoma in rats. The frequency of complete cure in animals treated with the DS–Dox nanoparticles was higher, compared to animals receiving the traditional form of the drug.

Study of correlation between state and composition of lipid phase and change in erythrocytes structure under induction of oxidative processes

We investigated human blood erythrocytes under oxidative stress in vitro and established a correlation between composition and state of lipids and changes in erythrocytes structure under induced oxidative stress. These changes may serve as an indicator of not only the erythrocyte state but of systemic processes that occur at the level of the whole organism, including various pathologies as well. We found that a pyrimidine derivative xymedon used in the present study is an effective inhibitor of oxidative processes. Xymedon may be useful as an antioxidant for preserving the structural and functional characteristics of the erythrocytes in the treatment of organisms exposed to physical and toxic factors causing oxidative stress.