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  Not just a fluidifying effect : omega-3 phospholipids induce formation of non-lamellar structures in biomembranes

de Santis, A., Vitiello, G., Appavou, M.-S., Scoppola, E., Fragneto, G., Barnsley, L. C., et al. (2020). Not just a fluidifying effect: omega-3 phospholipids induce formation of non-lamellar structures in biomembranes. Soft Matter, 16(46), 10425-10438. doi:10.1039/D0SM01549K.

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de Santis, Augusta, Author
Vitiello, Giuseppe, Author
Appavou, Marie-Sousai, Author
Scoppola, Ernesto1, Author              
Fragneto, Giovanna, Author
Barnsley, Lester C., Author
Clifton, Luke A., Author
Ottaviani, Maria Francesca, Author
Paduano, Luigi, Author
Russo Krauss, Irene, Author
D’Errico, Gerardino, Author
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1Emanuel Schneck, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2074300              

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 Abstract: Polyunsaturated omega-3 fatty acid docosahexaenoic acid (DHA) is found in very high concentrations in a few peculiar tissues, suggesting that it must have a specialized role. DHA was proposed to affect the function of the cell membrane and related proteins through an indirect mechanism of action, based on the DHA-phospholipid effects on the lipid bilayer structure. In this respect, most studies have focused on its influence on lipid-rafts, somehow neglecting the analysis of effects on liquid disordered phases that constitute most of the cell membranes, by reporting in these cases only a general fluidifying effect. In this study, by combining neutron reflectivity, cryo-transmission electron microscopy, small angle neutron scattering, dynamic light scattering and electron paramagnetic resonance spectroscopy, we characterize liquid disordered bilayers formed by the naturally abundant 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine and different contents of a di-DHA glycero-phosphocholine, 22:6-22:6PC, from both a molecular/microscopic and supramolecular/mesoscopic viewpoint. We show that, below a threshold concentration of about 40% molar percent, incorporation of 22:6-22:6PC in the membrane increases the lipid dynamics slightly but sufficiently to promote the membrane deformation and increase of multilamellarity. Notably, beyond this threshold, 22:6-22:6PC disfavours the formation of lamellar phases, leading to a phase separation consisting mostly of small spherical particles that coexist with a minority portion of a lipid blob with water-filled cavities. Concurrently, from a molecular viewpoint, the polyunsaturated acyl chains tend to fold and expose the termini to the aqueous medium. We propose that this peculiar tendency is a key feature of the DHA-phospholipids making them able to modulate the local morphology of biomembranes.

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Language(s): eng - English
 Dates: 2020-10-162020
 Publication Status: Published in print
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 Identifiers: DOI: 10.1039/D0SM01549K
BibTex Citekey: D0SM01549K
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Title: Soft Matter
  Abbreviation : Soft Matter
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 16 (46) Sequence Number: - Start / End Page: 10425 - 10438 Identifier: ISSN: 1744-683X