Role of neutral lipids in tear fluid lipid layer: Coarse-grained simulation study

Tutkimustuotos: Lehtiartikkeli

Tutkijat

  • Jelena Telenius
  • Artturi Koivuniemi
  • Pipsa Kulovesi
  • Juha M. Holopainen
  • Ilpo Vattulainen

Organisaatiot

  • Tampere University of Technology
  • VTT Technical Research Centre of Finland Ltd.
  • University of Helsinki
  • University of Southern Denmark

Kuvaus

Tear fluid lipid layer (TFLL) residing at the air-water interface of tears has been recognized to play an important role in the development of dry eye syndrome. Yet, the composition, structure, and mechanical properties of TFLL are only partly known. Here, we report results of coarse-grained simulations of a lipid layer comprising phospholipids, free fatty acids, cholesteryl esters, and triglycerides at the air-water interface to shed light on the properties of TFLL. We consider structural as well as dynamical properties of the lipid layer as a function of surface pressure. Simulations revealed that neutral lipids reside heterogeneously between phospholipids at relatively low pressures but form a separate hydrophobic phase with increasing surface pressure, transforming the initial lipid monolayer to a two-layered structure. When the model of TFLL was compared to a one-component phospholipid monolayer system, we found drastic differences in both structural and dynamical properties that explain the prominent role of neutral lipids as stabilizers of the TFLL. Based on our results, we suggest that neutral lipids are able to increase the stability of the TFLL by modulating its dynamical and structural behavior, which is important for the proper function of tear film.

Yksityiskohdat

AlkuperäiskieliEnglanti
Sivut17092-17100
Sivumäärä9
JulkaisuLangmuir
Vuosikerta28
Numero49
TilaJulkaistu - 11 joulukuuta 2012
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

ID: 17914408