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Stabilization of erythrocytes against oxidative and hypotonic stress by tannins isolated from sumac leaves (Rhus typhina L.) and grape seeds (Vitis vinifera L.)

100%

Olchowik E. , Lotkowski K. , Mavlyanov S. , Abdullajanova N. , Ionov M. , Bryszewska M. , Zamaraeva M.

Cellular and Molecular Biology Letters

2012

tom 17

nr 3

Erythrocytes are constantly exposed to ROS due to their function in the organism. High tension of oxygen, presence of hemoglobin iron and high concentration of polyunsaturated fatty acids in membrane make erythrocytes especially susceptible to oxidative stress. A comparison of the antioxidant activities of polyphenol-rich plant extracts containing hydrolysable tannins from sumac leaves (Rhus typhina L.) and condensed tannins from grape seeds (Vitis vinifera L.) showed that at the 5–50 μg/ml concentration range they reduced to the same extent hemolysis and glutathione, lipid and hemoglobin oxidation induced by erythrocyte treatment with 400 μM ONOO− or 1 mM HClO. However, extract (condensed tannins) from grape seeds in comparison with extract (hydrolysable tannins) from sumac leaves stabilized erythrocytes in hypotonic NaCl solutions weakly. Our data indicate that both hydrolysable and condensed tannins significantly decrease the fluidity of the surface of erythrocyte membranes but the effect of hydrolysable ones was more profound. In conclusion, our results indicate that extracts from sumac leaves (hydrolysable tannins) and grape seeds (condensed tannins) are very effective protectors against oxidative damage in erythrocytes.

Biophysical mechanisms and factors responsible for protein-tannin interactions

100%

Sekowski S. , Ionov M. , Bitiucki M. , Abdulladjanova N. , Mavlyanov S. , Bryszewska M. , Zamaraeva M.

Current Topics in Biophysics. Supplement

2016

tom 39

nr A: Posters

The interactions of PVP complexes of gossypol and its derivatives with an artificial membrane lipid matrix

100%

Ionov M. , Tukfatullina I. , Salakhutdinov B. , Baram N. , Bryszewska M. , Aripov T.

Cellular and Molecular Biology Letters

2010

tom 15

nr 1

98-117

In this paper, we present the results of a study on the membrane-active properties of gossypol, its derivatives and their polyvinylpyrrolidone complexes as assessed by differential scanning calorimetry and by the fluorescent probe method. The latter revealed the change in polarization of the incident radiation caused by the action of the polyphenol on the artificial membrane lipid matrix.

Physicochemical studies of interactions between main compound of Oenothera gigas tannins and liposomes

100%

Sekowski S. , Dubis A. , Ionov M. , Bryszewska M. , Mavlyanov S. , Zamarajewa M.

Current Topics in Biophysics. Supplement

2013

tom 36

nr 2A: Posters