Real-time quartz crystal microbalance monitoring of free docosahexaenoic acid interactions with supported lipid bilayers.

Flynn, Kiera R, Martin, Lisandra L, Ackland, M Leigh and Torriero, Angel A J 2016, Real-time quartz crystal microbalance monitoring of free docosahexaenoic acid interactions with supported lipid bilayers., Langmuir, vol. 32, no. 45, pp. 11717-11727, doi: 10.1021/acs.langmuir.6b01984.

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Title Real-time quartz crystal microbalance monitoring of free docosahexaenoic acid interactions with supported lipid bilayers.
Author(s) Flynn, Kiera R
Martin, Lisandra L
Ackland, M LeighORCID iD for Ackland, M Leigh
Torriero, Angel A JORCID iD for Torriero, Angel A J
Journal name Langmuir
Volume number 32
Issue number 45
Start page 11717
End page 11727
Total pages 11
Publisher American Chemical Society
Place of publication Washington D.C., Wash.
Publication date 2016-11-01
ISSN 1520-5827
Summary Docosahexaenoic acid (DHA) is the most abundant polyunsaturated omega-3 fatty acid found in mammalian neuronal cell membranes. Although DHA is known to be important for neuronal cell survival, little is know about how DHA interacts with phospholipid bilayers. This study presents a detailed quartz crystal microbalance with dissipation monitoring (QCM-D) analysis of free DHA interactions with individual and mixed phospholipid supported lipid bilayers (SLB). DHA incorporation and subsequent changes to the SLBs viscoelastic properties were observed to be concentration-dependent, influenced by the phospholipid species, the headgroup charge, and the presence or absence of calcium ions. It was observed that 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) SLBs incorporated the greatest amount of DHA concentration, whereas the presence of phospholipids, phosphatidylserine (PS), and phosphatidylinositol (PI) in a POPC SLB significantly reduced DHA incorporation and changed the SLBs physicochemical properties. These observations are hypothesized to be due to a substitution event occurring between DHA and phospholipid species. PS domain formation in POPC/PS 8:2 SLBs was observed in the presence of calcium ions, which favored DHA incorporation to a similar level as for a POPC only SLB. The changes in SLB thickness observed with different DHA concentrations are also presented. This work contributes to an understanding of the physical changes induced in a lipid bilayer as a consequence of its exposure to different DHA concentrations (from 50 to 200 μM). The capacity of DHA to influence the physical properties of SLBs indicates the potential for dietary DHA supplementation to cause changes in cellular membranes in vivo, with subsequent physiological consequences for cell function.
Language eng
DOI 10.1021/acs.langmuir.6b01984
Field of Research 030401 Biologically Active Molecules
030699 Physical Chemistry not elsewhere classified
030603 Colloid and Surface Chemistry
Socio Economic Objective 970102 Expanding Knowledge in the Physical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, American Chemical Society
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