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Neuronal P2X2 Receptors Are Mobile ATP Sensors That Explore the Plasma Membrane When Activated

Year: 2011

Type: article

Abstract: ATP-gated ionotropic P2X2 receptors are widely expressed in neurons. Although the electrophysiological properties of P2X2 receptors have been extensively studied, little is known about the plasma membrane lateral mobility of P2X2 receptors or whether receptor mobility is regulated by ATP. Here we used single-molecule imaging with simultaneous whole-cell voltage-clamp recordings to track quantum dot-labeled P2X2 receptors in the dendrites of rat hippocampal neurons to explore P2X2 receptor mobility and its regulation. We find that plasma membrane P2X2 receptor lateral mobility in dendrites is heterogeneous but mostly Brownian in nature, consisting of mobile and slowly mobile receptor pools. Moreover, lateral mobility is P2X2 subunit and cell specific, is increased in an activation-dependent manner, and is regulated by cytosolic VILIP1, a calcium binding protein. Our data provide the first direct measures of P2X receptor mobility and show that P2X2 receptors are mobile ATP sensors, sampling more of the dendritic plasma membrane in response to ATP.

Source: Journal of Neuroscience

DOI: 10.1523/jneurosci.3362-11.2011

Authors: Esther Richler, Eiji Shigetomi, Baljit S. Khakh

Institution: University of California, Los Angeles

Language: English

Topic: Adenosine and Purinergic Signaling

Subfield: Physiology

Field: Biochemistry, Genetics and Molecular Biology

Domain: Life Sciences

Open Access status: hybrid

Funders: National Institutes of Health, University of California, Los Angeles, National Institute of General Medical Sciences, National Institute of Neurological Disorders and Stroke