UMR 5672

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Alterations of lipid bilayers under photo-induced oxidation

Carlos Marques (CNRS, Université de Strasbourg)
When Sep 30, 2019
from 11:00 to 12:00
Where Amphi. Schrödinger
Attendees Carlos Marques
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The optical absorption spectrum of lipids or of lipid membranes does not display any peculiar feature in the visible wavelength range, from 400 to 700 nm. A lipid bilayer can be thus observed under a light microscope for many hours without being destroyed, transformed or even without suffering any visible degradation. Light, however, can induce numerous chemical and physical transformations in real lipid membrane systems that contain often photosensitive molecules: fluorescently labeled phospholipids, cholesterol, proteins and other membrane-forming molecules, fluorophores added to the solution for measuring permeability and other properties, biomimetic constructs, including light-sensitive proteins embedded or interacting with the bilayer ... arguably most practical membrane systems strongly absorb light and bear thus the potential of undergoing membrane transformations when exposed to visible light.

In this talk I will discuss the physical transformations in lipid membranes exposed to photo-induced oxidation, a natural metabolic outcome of life with oxygen under light, but also a salient oxidation reaction in photomedicine treatments. After summarizing our recent efforts to understand alterations of lipid membrane structure, mechanics and phase behavior following the formation of photo-induced lipid products I will highlight current and future challenges for the physics of oxidized lipid membranes.

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