Changes in Plasma Membrane Surface Potential of PC12 Cells As Measured by Kelvin Probe Force Microscopy

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2012 Apr 17

PMID 22506008

Citations 4

Authors

Chia-Chang Tsai

Hui-Hsing Hung

Chien-Pang Liu

Yit-Tsong Chen

Chien-Yuan Pan

Affiliations

Soon will be listed here.

Abstract

The plasma membrane of a cell not only works as a physical barrier but also mediates the signal relay between the extracellular milieu and the cell interior. Various stimulants may cause the redistribution of molecules, like lipids, proteins, and polysaccharides, on the plasma membrane and change the surface potential (Φ(s)). In this study, the Φ(s)s of PC12 cell plasma membranes were measured by atomic force microscopy in Kelvin probe mode (KPFM). The skewness values of the Φ(s)s distribution histogram were found to be mostly negative, and the incorporation of negatively charged phosphatidylserine shifted the average skewness values to positive. After being treated with H(2)O(2), dopamine, or Zn(2+), phosphatidylserine was found to be translocated to the membrane outer leaflet and the averaged skewness values were changed to positive values. These results demonstrated that KPFM can be used to monitor cell physiology status in response to various stimulants with high spatial resolution.

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