@article{Bernardino:2013:10.1016/j.bbamem.2013.07.008,
author = {Bernardino, de la Serna J and Hansen, S and Berzina, Z and Simonsen, AC and Hannibal-Bach, HK and Knudsen, J and Ejsing, CS and Bagatolli, LA},
doi = {10.1016/j.bbamem.2013.07.008},
journal = {BBA: Biomembranes},
pages = {2450--2459},
title = {Compositional and structural characterization of monolayers and bilayers composed of native pulmonary surfactant from wild type mice},
url = {http://dx.doi.org/10.1016/j.bbamem.2013.07.008},
volume = {1828},
year = {2013}
}

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TY  - JOUR
AB  - This work comprises a structural and dynamical study of monolayers and bilayers composed of native pulmonary surfactant from mice. Spatially resolved information was obtained using fluorescence (confocal, wide field and two photon excitation) and atomic force microscopy methods. Lipid mass spectrometry experiments were also performed in order to obtain relevant information on the lipid composition of this material. Bilayers composed of mice pulmonary surfactant showed coexistence of distinct domains at room temperature, with morphologies and lateral packing resembling the coexistence of liquid ordered (lo)/liquid disordered (ld)-like phases reported previously in porcine lung surfactant. Interestingly, the molar ratio of saturated (mostly DPPC)/non-saturated phospholipid species and cholesterol measured in the innate material corresponds with that of a DOPC/DPPC/cholesterol mixture showing lo/ld phase coexistence at a similar temperature. This suggests that at quasi-equilibrium conditions, key lipid classes in this complex biological material are still able to produce the same scaffold observed in relevant but simpler model lipid mixtures. Also, robust structural and dynamical similarities between mono- and bi-layers composed of mice pulmonary surfactant were observed when the monolayers reach a surface pressure of 30 mN/m. This value is in line with theoretically predicted and recently measured surface pressures, where the monolayer–bilayer equivalence occurs in samples composed of single phospholipids. Finally, squeezed out material attached to pulmonary surfactant monolayers was observed at surface pressures near the beginning of the monolayer reversible exclusion plateau (~ 40 mN/m). Under these conditions this material adopts elongated tubular shapes and displays ordered lateral packing as indicated by spatially resolved LAURDAN GP measurements.
AU  - Bernardino,de la Serna J
AU  - Hansen,S
AU  - Berzina,Z
AU  - Simonsen,AC
AU  - Hannibal-Bach,HK
AU  - Knudsen,J
AU  - Ejsing,CS
AU  - Bagatolli,LA
DO  - 10.1016/j.bbamem.2013.07.008
EP  - 2459
PY  - 2013///
SN  - 0005-2736
SP  - 2450
TI  - Compositional and structural characterization of monolayers and bilayers composed of native pulmonary surfactant from wild type mice
T2  - BBA: Biomembranes
UR  - http://dx.doi.org/10.1016/j.bbamem.2013.07.008
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000326143200012&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/107644
VL  - 1828
ER  - 

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