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Issue 24, 2014
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Lipid oxidation induces structural changes in biomimetic membranes

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Oxidation can intimately influence and structurally compromise the levels of biological self-assembly embodied by intracellular and plasma membranes. Lipid peroxidation, a natural metabolic outcome of life with oxygen under light, is also a salient oxidation reaction in photomedicine treatments. However, the effect of peroxidation on the fate of lipid membranes remains elusive. Here we use a new photosensitizer that anchors and disperses in the membrane to achieve spatial control of the oxidizing species. We find, surprisingly, that the integrity of unsaturated unilamellar vesicles is preserved even for fully oxidized membranes. Membrane survival allows for the quantification of the transformations of the peroxidized bilayers, providing key physical and chemical information to understand the effect of lipid oxidation on protein insertion and on other mechanisms of cell function. We anticipate that spatially controlled oxidation will emerge as a new powerful strategy for tuning and evaluating lipid membranes in biomimetic media under oxidative stress.

Graphical abstract: Lipid oxidation induces structural changes in biomimetic membranes

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The article was received on 28 Oct 2013, accepted on 20 Dec 2013 and first published on 23 Dec 2013

Article type: Paper
DOI: 10.1039/C3SM52740A
Soft Matter, 2014,10, 4241-4247

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    Lipid oxidation induces structural changes in biomimetic membranes

    G. Weber, T. Charitat, M. S. Baptista, A. F. Uchoa, C. Pavani, H. C. Junqueira, Y. Guo, V. A. Baulin, R. Itri, C. M. Marques and A. P. Schroder, Soft Matter, 2014, 10, 4241
    DOI: 10.1039/C3SM52740A

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