Liquid-crystalline collapse of pulmonary surfactant monolayers.

Liquid-crystalline collapse of pulmonary surfactant monolayers.
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肺表面活性剂单层的液晶塌陷。

DOI:
10.1016/s0006-3495(03)75107-8
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发表时间:
2003
影响因子:
3.4
通讯作者:
Vogel,Viola
Vogel,Viola
中科院分区:
生物学3区
文献类型:
--
作者:
Schief,WilliamR;Antia,Meher;Discher,BohdanaM;Hall,StephenB;Vogel,Viola

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在呼气过程中,覆盖肺泡的脂质和蛋白质表面活性剂膜被压缩到高表面压力,并在接近70mN/m的压力下长时间保持亚稳态。然而,小牛肺表面活性剂提取物(CLSE)的单层在体外,在初始压力为45mN/m时塌陷。为了获得有关这种差异来源的信息,我们研究了CLSE单层如何从界面上坍塌。用荧光、布鲁斯特角和光散射显微镜观察表明,含有CLSE、CLSE-胆固醇(20%)或双棕榈酰磷脂酰胆碱(DPPC)-二氢胆固醇的二元混合物的单层都形成位于单层上方的双层圆盘。经过压缩和膨胀,脂质不断地从单层流入圆盘,反之亦然。在几个方面,这种坍塌的模式类似于其他两亲体形成近晶液晶相的行为。这些发现表明,表面膜的组成部分必须集体坍塌,而不是单独挤压。
During exhalation, the surfactant film of lipids and proteins that coats the alveoli in the lung is compressed to high surface pressures, and can remain metastable for prolonged periods at pressures approaching 70mN/m. Monolayers of calf lung surfactant extract (CLSE), however, collapse in vitro, during an initial compression at ∼45mN/m. To gain information on the source of this discrepancy, we investigated how monolayers of CLSE collapse from the interface. Observations with fluorescence, Brewster angle, and light scattering microscopies show that monolayers containing CLSE, CLSE-cholesterol (20%), or binary mixtures of dipalmitoyl phosphatidylcholine(DPPC)-dihydrocholesterol all form bilayer disks that reside above the monolayer. Upon compression and expansion, lipids flow continuously from the monolayer into the disks, and vice versa. In several respects, the mode of collapse resembles the behavior of other amphiphiles that form smectic liquid-crystal phases. These findings suggest that components of surfactent films must collapse collectively rather than being squeezed out individually.
通过落射荧光显微镜研究浓缩和液体磷脂酰胆碱单层中的胆固醇。
DOI: 10.1016/s0006-3495(97)78900-8
发表时间: 1997
影响因子: 3.4
作者:
L. D. Worthman;K. Nag;Philip J. Davis;K. Keough
通讯作者: K. Keough
DOI: 10.1021/la00019a048
发表时间: 1994-07-01
期刊: LANGMUIR
影响因子: 3.9
作者:
DEMUL, MNG;MANN, JA
通讯作者: MANN, JA
DOI: 10.1021/la9713154
发表时间: 1998-04-28
期刊: LANGMUIR
影响因子: 3.9
作者:
de Mul, MNG;Mann, JA
通讯作者: Mann, JA
DOI: 10.1021/j100162a052
发表时间: 1991
期刊: The Journal of Physical Chemistry
影响因子: --
作者:
D. Vollhardt;U. Retter
通讯作者: U. Retter
为什么选择布儒斯特角显微镜
DOI: 10.1016/s0927-7757(99)00555-5
发表时间: 2000
期刊: Colloids and Surfaces A: Physicochemical and Engineering Aspects
影响因子: --
作者:
J. Meunier
通讯作者: J. Meunier