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9. Red Blood Cell Susceptibility to Pneumolysin: CORRELATION WITH MEMBRANE BIOCHEMICAL AND PHYSICAL PROPERTIES*

Author

Bokori-Brown, Monika, Petrov, Peter G., Khafaji, Mawya A., Mughal, Muhammad K., Naylor, Claire E., Shore, Angela C., Gooding, Kim M., Casanova, Francesco, Mitchell, Tim J., Titball, Richard W., and Winlove, C. Peter

Subjects
Male, Bacterial Toxins, Erythrocyte Membrane, respiratory system, Membrane Potentials, Hemolysin Proteins, Oxidative Stress, Streptococcus pneumoniae, Bacterial Proteins, Membrane Biology, Streptolysins, Diabetes Mellitus, Humans, Female
Abstract

This study investigated the effect of the biochemical and biophysical properties of the plasma membrane as well as membrane morphology on the susceptibility of human red blood cells to the cholesterol-dependent cytolysin pneumolysin, a key virulence factor of Streptococcus pneumoniae, using single cell studies. We show a correlation between the physical properties of the membrane (bending rigidity and surface and dipole electrostatic potentials) and the susceptibility of red blood cells to pneumolysin-induced hemolysis. We demonstrate that biochemical modifications of the membrane induced by oxidative stress, lipid scrambling, and artificial cell aging modulate the cell response to the toxin. We provide evidence that the diversity of response to pneumolysin in diabetic red blood cells correlates with levels of glycated hemoglobin and that the mechanical properties of the red blood cell plasma membrane are altered in diabetes. Finally, we show that diabetic red blood cells are more resistant to pneumolysin and the related toxin perfringolysin O relative to healthy red blood cells. Taken together, these studies indicate that the diversity of cell response to pneumolysin within a population of human red blood cells is influenced by the biophysical and biochemical status of the plasma membrane and the chemical and/or oxidative stress pre-history of the cell.

Published
2016

11. Red Blood Cell Susceptibility to Pneumolysin

Author

Bokori-Brown, Monika, primary, Petrov, Peter G., additional, Khafaji, Mawya A., additional, Mughal, Muhammad K., additional, Naylor, Claire E., additional, Shore, Angela C., additional, Gooding, Kim M., additional, Casanova, Francesco, additional, Mitchell, Tim J., additional, Titball, Richard W., additional, and Winlove, C. Peter, additional

Published
2016
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