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    Red blood cell susceptibility to pneumolysin: Correlation with membrane biochemical and physical properties

    Bokori-Brown, M. and Petrov, P.G. and Khafaji, M.A. and Mughal, M.K. and Naylor, Claire and Shore, A.C. and Gooding, K.M. and Casanova, F. and Mitchell, T.J. and Titball, R.W. and Winlove, C.P. (2016) Red blood cell susceptibility to pneumolysin: Correlation with membrane biochemical and physical properties. Journal of Biological Chemistry 291 (19), pp. 10210-10227. ISSN 0021-9258.

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    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, surface and dipole electrostatic potentials) and the susceptibility of red blood cells to pneumolysin-induced haemolysis. 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 haemoglobin (Hba1c) 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 prehistory of the cell.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): aging, bacterial toxin, diabetes, erythrocyte membrane, biophysics, oxidative stress, bending rigidity, dipole potential, pneumolysin, surface potential
    School: Birkbeck Schools and Departments > School of Science > Biological Sciences
    Depositing User: Administrator
    Date Deposited: 16 May 2016 13:40
    Last Modified: 09 Jun 2016 14:27
    URI: http://eprints.bbk.ac.uk/id/eprint/15180

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