Regulation of Plasma Membrane Nanodomains of the Water Channel Aquaporin-3 Revealed by Fixed and Live Photoactivated Localization Microscopy

被引：15

作者：

Arnspang, Eva C. ^{[1
,2
,3
,4
]}

Sengupta, Prabuddha ^{[3
,5
]}

Mortensen, Kim I. ^{[6
]}

Jensen, Helene H. ^{[1
,7
]}

Hahn, Ute ^{[8
]}

Jensen, Eva B. V. ^{[8
]}

Lippincott-Schwartz, Jennifer ^{[3
,5
]}

Nejsum, Lene N. ^{[1
,2
]}

机构：

[1] Aarhus Univ, Dept Clin Med, DK-8000 Aarhus, Denmark

[2] Aarhus Univ, Interdisciplinary Nanosci Ctr iNANO, DK-8000 Aarhus, Denmark

[3] Eunice Kennedy Shriver Natl Inst Child Hlth & Hum, NIH, Bethesda, MD 20892 USA

[4] Univ Southern Denmark, Dept Chem Engn Biotechnol & Environm Technol, DK-5230 Odense M, Denmark

[5] Janelia Res Campus, Ashburn, VA 20147 USA

[6] Tech Univ Denmark, Dept Micro & Nanotechnol, DK-2800 Lyngby, Denmark

[7] Aarhus Univ, Dept Mol Biol & Genet, DK-8000 Aarhus, Denmark

[8] Aarhus Univ, Dept Math, DK-8000 Aarhus, Denmark

来源：

NANO LETTERS | 2019年 / 19卷 / 02期

关键词：

Super resolved microscopy; aquaporin; nanodomains; photoactivated localization microscopy; confined diffusion; single molecule; DIFFUSION; CAMP; TRACKING;

D O I：

10.1021/acs.nanolett.8b03721

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Several aquaporin (AQP) water channels are short-term regulated by the messenger cyclic adenosine monophosphate (cAMP), including AQP3. Bulk measurements show that cAMP can change diffusive properties of AQP3; however, it remains unknown how elevated cAMP affects AQP3 organization at the nanoscale. Here we analyzed AQP3 nano-organization following cAMP stimulation using photoactivated localization microscopy (PALM) of fixed cells combined with pair correlation analysis. Moreover, in live cells, we combined PALM acquisitions of single fluorophores with single -particle tracking (spt-PALM). These analyses revealed that AQP3 tends to cluster and that the diffusive mobility is confined to nanodomains with radii of similar to 150 nm. This domain size increases by similar to 30% upon elevation of cAMP, which, however, is not accompanied by a significant increase in the confined diffusion coefficient. This regulation of AQP3 organization at the nanoscale may be important for understanding the mechanisms of water AQP3-mediated water transport across plasma membranes.

引用

页码：699 / 707

页数：9

共 41 条

[41] Optimal estimation of diffusion coefficients from single-particle trajectories [J].

Vestergaard, Christian L. ;

Blainey, Paul C. ;

Flyvbjerg, Henrik .

PHYSICAL REVIEW E, 2014, 89 (02)

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