• Nanion Technologies: Smart Tools for Ion Channel Research

    Nanion Technologies: Smart Tools for Ion Channel Research

  • SyncroPatch 384i: HTS Automated Patch Clamp

    SyncroPatch 384i: HTS Automated Patch Clamp

  • SURFE²R 96SE: Label-free HTS Transporter Screening

    SURFE²R 96SE: Label-free HTS Transporter Screening

  • Dynamic Clamp: Patchliner

    Dynamic Clamp: Patchliner

  • Bilayer recordings: Orbit product family

    Bilayer recordings: Orbit product family

  • CardioExcyte 96 SOL: Pacing Cardiomyocytes with Light

    CardioExcyte 96 SOL: Pacing Cardiomyocytes with Light

Our Product Portfolio

SyncroPatch 384

SyncroPatch 384

Patchliner

Patchliner

Port-a-Patch

Port-a-Patch

Port-a-Patch mini

Port-a-Patch mini

CardioExcyte 96

CardioExcyte 96

FLEXcyte 96

FLEXcyte 96

SURFE²R 96SE

SURFE²R 96SE

SURFE²R N1

SURFE²R N1

Orbit 16 TC

Orbit 16 TC

Orbit Mini

Orbit Mini

Vesicle Prep Pro

Vesicle Prep Pro

Buffer Solution

Buffer Solution

2021 - EPA and DHA differentially modulate membrane elasticity in the presence of cholesterol

 icon vpp  Vesicle Prep Pro Publication in Biophysical Journal (2021)

Authors:
Jacobs M.L., Faizi H.A., Peruzzi J.A., Vlahovska P.M., Kamat N.P.

Journal: 
Biophysical Journal (2021) doi: 10.1016/j.bpj.2021.04.009


Abstract: 

Polyunsaturated fatty acids (PUFAs) modify the activity of a wide range of membrane proteins and are increasingly hypothesized to modulate protein activity by indirectly altering membrane physical properties. Among the various physical properties affected by PUFAs, the membrane area expansion modulus (Ka), which measures membrane strain in response to applied force, is expected to be a significant controller of channel activity. Yet the impact of PUFAs on membrane Ka has not been measured previously. Through a series of micropipette aspiration studies, we measured the apparent Ka (Kapp) of phospholipid model membranes containing non-esterified fatty acids. First, we measured membrane Kapp as a function of the location of the unsaturated bond and degree of unsaturation in the incorporated fatty acids and found that Kapp generally decreases in the presence of fatty acids with three or more unsaturated bonds. Next, we assessed how select ω-3 PUFAs, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), affect the Kapp of membranes containing cholesterol. In vesicles prepared with high amounts of cholesterol, which should increase the propensity of the membrane to phase segregate, we found that inclusion of DHA decreases the Kapp in comparison to EPA. We also measured how these ω-3 PUFAs affect membrane fluidity and bending rigidity to determine how membrane Kapp changes in relation to these other physical properties. Our study shows that PUFAs generally decrease Kapp of membranes and that EPA and DHA have differential effects on Kapp when membranes contain higher levels of cholesterol. Our results suggest membrane phase behavior, and the distribution of membrane elasticizing amphiphiles, impacts the ability of a membrane to stretch.


Download here

Back to Overview

We use cookies on our website. Some of them are essential for the operation of the site, while others help us to improve this site and the user experience (tracking cookies). You can decide for yourself whether you want to allow cookies or not. Please note that if you reject them, you may not be able to use all the functionalities of the site.